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PRESERVATION PROCEDURE

ANDCONDITION MONITORING

FOR

SPARE PARTS OF TRANSMISSION SYSTEM

EQUIPMENT AND

SPECIAL TOOLS & PLANTS

CORPORATE OPERATION SERVICES

POWERGRID CORPORATION OF INDIA LTD.

DECEMBER, 2004



INDEX

S. NO. DESCRIPTIOPN PAGE NO.

1. PRESERVATION PROCEDURE AND CONDITION

MONITORING FOR SPARE PARTS AND SPECIAL TOOLSAND PLANT

1-22

2. GENRAL LAYOUT OF STORAGE AREA 23

3. TABLE FOR PRESERVATION PROCEDURES 24-30

4. TABLE FOR CONDITION MONITORING CHECKS 31-37

5. FORMAT FOR MONTHLY CHECK LISTS 38-40

6. FORMAT FOR SIX MONTHLY CHECK LISTS 41-43

7. FORMAT FOR YEARLY CHECK LISTS 44-45

8. FORMAT FOR 5 YEARLY CHECK LISTS 46-47

DOC No : D-1-10-XX-01-02

POWERGRID PRESERVATION PROCEDURE



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PRESERVATION PROCEDURE

AND

CONDITION MONITORINGFOR

SPARE PARTS OF TRANSMISSION SYSTEM

EQUIPMENT

AND

SPECIAL TOOLS PLANTS



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PRESERVATION PROCEDURE AND CONDITION MONITORING FOR SPARE PARTS OF

TRANSMISSION SYSTEM EOUIPMENT AND SPECIAL TOOLS PLANTS

1. INTRODUCTION

Large quantities of stores deteriorate during storage due to number of causes and

become unserviceable / scrap and cause loss to the Company. The care of materials

in store is therefore, an important aspect of O&M activities and requires regular vigil.

2. CAUSES OF DAMAGES

Deterioration can be classified based on the following causes:-

i) Biological

ii) Non-biological.

2.1. DAMAGE DUE TO BIOLOGICAL CAUSES

Damages arc caused to stores by insects and organism such as white ants, Mildew,

Goons and Rots, which are usually referred to as Biological Damages.

2.1.1 WHITE ANTS

These are very common in India and if ignored they are capable of causing endless

damage. The White ant is usually active during the monsoon and prefers moist soil

and may attack stores in contact with walls or roof or ground common forms of wood,

wooden articles, papers books, cloth and clothing fall easy prey to them.

2.1.1.1 PREVENTIVE MEASURES

The use of coal tar is very effective and in-expensive to use. Where the presence of

white ant is suspected the floors especially the corners, wooden piles, racks and

furniture coming in direct contract with the ground should occasionally receive a

coating of coal tar.

Apart from the above the following precautions should also be taken:

i) Stores should be kept off the ground at least 300 mm high on a platform made of

metal or any material not susceptible to white ant damage.

ii) The floor of godowns and storehouses should be made of cement concrete. All

cracks should be repaired promptly as and when they developed.

iii) Stores should not be allowed to touch roof or walls.



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2.1.2 ROT AND MILDEW

Rot and Mildew are names given to organism belonging to the plant kingdom, which

also cause considerable damage to stores. Mildew can be defined as low form of alarge group of plants known as 'FUNGI'. The 'ROT' may in general be defined as stateof deterioration of stores caused by micro-organism called bacteria. Both of themattack easily all stores, which are of plant origin i.e. contains cellulose of some form orthe other. Rot and Mildew generally take place during monsoon and in places where itis damp and wet.

2.1.2.1 PREVENTIVE MEASURES

i. All godowns and store houses must be opened daily to allow free ventilation

particularly during the monsoon season.

ii. Stores must be kept away from walls and off the ground.

iii. Stores must not be packed and stacked while wet or damp.

iv. Store material should be frequently turned over wherever applicable.

v. Stores must be inspected frequently and should be immediately treated when

any damage is noticed.

2.1.2.2 CURATIVE MEASURES

There are a few curative measures, which are of general application:

i. Damaged material should be exposed to the Sun for a few days with a frequentturn over.

ii. Any insecticide may be used or sprayed on the damaged portion.iii. Oils and Chemicals used to kill insect pests are effective against rot and mildew

also.

Before any treatment is given, the damaged stores material should be segregated fromthe good ones.

2.2 DAMAGE DUE TO NON-BIOLOGICAL CAUSES

Rusting of iron stores, caking of paints, hardening of rubber are such common

experiences and these are some of the most important types of non- biological

damage to general stores.



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The drums must be stored lying on their cylindrical surface on wooden sleeper andturned so that both caps lie on a horizontal line. The covered store where oil drumsare to be stored shall be prepared preferably with sand bed with raised platform of

minimum 300 mm or maximum flood level of that area whichever is higher.

Monthly inspection of condition of oil drums in respect of any leakage to be ensuredand leaking drums should be taken out of the stock.

2.2.2.1 STORAGE OF OIL IN TANKS

The size of the storage tank for oil can vary but a volume of 6-15m3 have proved to besuitable for storing the oil for longer duration or for circulation when required. Thestorage tanks should be sand blasted inside or painted suitably for oil storage purposeand fitted with suitable top inlet and bottom outlet, dehydrating breathers, oil levelindicators, provision of drain valve and manhole covered with effective sealing. Before

usage, the tanks should be inspected and if necessary cleaned.

The condition of dehydrating breathers shall be inspected periodically say once in 3months and if required the dehydrating material should be reconditioned or replaced.The BDV of the Oil shall be checked up once in 6 monthly.

2.2.3 RUBBER AND RUBBER GOODS

Rubber is a vegetable product and most articles made for it are subject to deteriorationat a rate depending upon the climate condition under which they are stored.

It is desired that the date of delivery of these items are noted in the register with theexpiry date of material depending on the manufacturer’s recommendation. Theconsumption of these type of material shall be always “FIRST IN” and “FIRST OUT”.

2.2.3.1 STORAGE CONDITIONS

i. Effect of sunlight: Sunlight has a very bad effect on rubber. Stocks should notbe exposed to it directly.

ii. Ventilation: Air currents in the store room should be avoided, especially if theincoming air is drawn from brilliant sunlight as it has been found that such aircarries with it the very harmful effect of actinic rays.

iii. Humidity: During the period of very low atmospheric humidity, i.e. during the drysummer months, open dishes of water should be placed in the store room orsome arrangement made for periodic wetting of the floor.



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iv. Storage Racks: Actual storage of rubber goods should be open frame work orracks to give a free but not agitated circulation of air. The lowest bin should be ata height sufficient to provide reasonable floor clearance. Tyres should alwaysstand on end and never be stacked horizontally one upon another, otherwisedistortion of the lower tyres occur.

3.0 PROCEDURE REGARDING INDOOR AND OUTDOOR STORING AREA

3.1 INDOOR OR COVERED STORE

The main building should avoid large unprotected or easily accessible windows and

wide ventilators. Brick buildings or corrugated sheds with bricked plinths are the most

suitable enclosure for store houses, while designing a store building or deciding

alterations or extension to existing structures 'intruders' point of view must always be

borne in mind. While releasing the construction drawings for the switchyard, theformation level of the stores also to be worked out based on the contour level data

furnished by site so that the storage area shall be necessarily at a higher formation

level to avoid water logging. Suitable entry and exit points also are to be considered.

Racks for storing valuable and pilferage-able nature of items should be designed in

such a way, so that these may afford full protection to the materials stocked therein.

While stocking machinery and plant, lorries, water pumps etc. on long-term basis, allimportant copper or brass mountings should be removed and kept inside with safecustody.

Suitable design of illumination and using of FRLS cables to be considered to preventany fire hazard and its spreading to the adjacent area. And also suitable fire alarmsystem to be incorporated along with provision of exhaust fans with guard shall bemade in the store room. Special care should be given for warming such that spaceheater in MOM box can be connected.

3.2 OUT DOOR STORE

For storage of outdoor equipment a concrete base to be prepared and the size may befixed to approximately 400 sq. m. However the area mentioned above is indicative onlyand may be assessed on the exact requirement.

The level of this platform should be minimum 300 mm above ground level or above themaximum flood level of that area.

It shall be ensured that under no circumstances the water level shall rise above theflooring level. Materials shall not be stored at places prone to water logging.



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Further the outdoor storage should be at least 100 meter away from the energized bayequipment. This will avoid the consequential damages in case of blasting of oil filledequipment or other equipment subjected to explosion during operation.

For easy access of the stored equipment, it is desirable that a cranable road all aroundis available. Further in order to load/unload of material to the open storage area asuitable point should be marked at a height matching with the base of truck with theopen storage area. There will be a negative slope below the ground level such thattruck level match.

The fire hydrant points (say 2/3 nos.) may be suitably located if available at the sub-station. Other fire fighting equipment like water buckets, sand buckets etc. are also tobe placed at indoor as well as outdoor storage area. Few tap water points should alsobe provided surrounding the storage area. A low cost fire fighting arrangement withseparate bore- well, storage tank, booster pump and flexible hoses can be envisagedwhere extension of hydrant line from substation is not economical or not technicallyfeasible.

The area around the open storage shall be well illuminated and fencing around theopen storage area shall be ensured.

3.3 GENERAL STORING

AIl equipments including mandatory spares on receipt shall be inspected afterremoving the packing before storing and in case of delay in erection activities, theequipment should be packed again using the same packing material.

The equipments that are to be stored outdoor in packed condition must be properlywrapped with polythene covers.

Before using any spare, it has to be verified for its functional testing and other

satisfactory tests covered under Pre-commissioning procedures.

Scrap and unused material shall be removed from the main storage area and placed ata location identified as scrap area.



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During storage of the equipment, it is to be ensured that storage, handling instructionsshould be retained along with the packing in moisture protective cover as well as in theclassified documentation file.

3.4 PROTECTION OF MATERIAL

The instinct of theft is human weakness and its active manifestation is dependent uponthe ease with which it can be fully or partially satisfied. The intrinsic value of an item oritems need not always be a primary consideration. The basic principle of avoiding atheft, therefore, is to make its execution an extremely difficult if not an impossible task.This may be accomplished in several ways.

3.4.1 FENCING

The storage area shall be provided with a fencing of barbed wire surrounding the openstorage area & storage shed. If boundary wall is provided in the surrounding of store,the barbed wire fencing can be provided over the top of the wall and charged with lowvoltage ( say 50 Volt AC). An alarm system may be provided to warn the security staff.

3.4.2 YARD LIGHTING

It may not be necessary during night to keep lights burning inside the locked godowns,but the outside yards, verandahs, corridors and entire neighborhood of the boundarywall should be adequately illuminated. Adequate number of watch towers all alongnear to the store to be provided.

3.4.3 STAMPING OF COMPANY MATERIALS

There are possibilities of certain items of stores being misused or misappropriatedwhile in the custody of the consumers. Quite a number of items are capable of beingutilized for private purposes and being offered to outsiders for sale. An effective way todiscourage misuse and pilferage is to mark or stamp such items suitably.

3.4.4 CARE OF MATERIAL AGAINST FIRE

Losses by fire can be classified as accidents and like most accidents they are

preventable. In a store Depot/ Store House there are several sources of fire which, ifuncontrolled, are likely to destroy inflammable goods of which large quantities aremostly held in stocks.



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3.4.4.1 CAUSES OF FIRE AND THEIR PREVENTION

3.4.4.1.1 ELECTRIC SHORT CIRCUIT

Any short circuit sparking or smell of burnt rubber should be immediately reported toconcerned executive for action.

3.4.4.1.2 SPARKS FROM UNINTENTIONAL HUMAN

Danger from human elements is limited to combustible material stocked in yards whichmay be due to unintentional disposal of butts of BIDDIES / CIGARETTES, Timber, firewood, dry grass, coal stacks, and rubbish heaps etc. are the items which are likely tocatch fire and may in turn transmit the conflagration to a larger area. Yards must befreed of all unnecessary Scraps / Garbage etc. and weed especially before theapproach of dry season. Further in order to avoid Fire Hazards, suitable anti-weedtreatment as being done for switchyard need to be done for out door stores also. SignBoards of NO SMOKING/ SMOKING PROHIBITED ZONE may be placed at variousplaces of INDOOR / OUT DOOR store.

3.4.4.1.3 AUTO-COMBUSTION

In summer oil soaked fire wood or cotton waste are likely to ignite. Cotton waste orother rags used for cleaning tanks or other implements in an oil godown or elsewhereshould not be left inside the godown nor thrown carelessly amidst dry grass or stacksof wooden sleepers etc but should be thrown into the bins specially provided for thepurpose.

3.4.4.1.4 FIRE FIGHTING APPLIANCES

The fire fighting appliances should be provided at suitable points according to the needof the Store Depot/Store Houses

i. Water Buckets.

ii. Sand Buckets.

iii. Chemical Extinguishers.

iv. Hydrants if available in S/S. or water tap points or storage water

v. Chemical extinguishers should be re-charged as per advice of manufacturer

3.4.4.1.5 COMMUNICATION AND ROADS If the store yards arc sufficiently large, metalled roads and well kept paths shall beprovided to enable fire engines and large chemical extinguishers to reach all pointswhere inflammable articles are stacked.



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3.4.4.1.6 FIRE ALARM

Suitable fire alarm equipment according to the needs of the place with a extension tocontrol room be provided to bring to the notice of every one the accident of fire.

4.0 In order to make a standard preservation procedure for all the equipmentof POWERGRID Transmission System, the followings practices shall befollowed

4.1 TRANSFORMER/ REACTORS AND COMPONENTS

For long time storage of supplied goods for Transformer and Reactors, themanufacturer’s recommendations are to be followed. In this document it is only astandard practice or guideline to be followed, however it may differ with that ofmanufacturer’s recommendation at places.

i. The storing place should be available for inspection and maintenance of thetransformer/reactor. The bedding for the transformer / reactor should be largerthan the bottom surface of the transformer/reactor. The transformer/ reactor isplaced on raised beams so that good ventilation is obtained underneath thetransformer bottom.

ii. Normally the transformer/reactors are dispatched to site dismantled and filledwith Dry air or Nitrogen. The transformer may be stored up to 3 months afterarrival at the site without oil filling. During the storing time the dry air or Nitrogenfilling shall be maintained, say 20 KPA (0.2 bar) at 20° C. The due point of Dryair or nitrogen shall be < -25 ° C and purity of nitrogen shall be > 99 %.

4.1.1 Independent of the duration of the storing time, the direction given belowshall apply for all the components and accessories.

4.1.1.1 STORING INDOORS IN A DRY COVERED AREA

i. Insulation material such as papers, pressboard, bakelite, cotton tapes etc.ii. Chemicals such as solvents, glues, varnishes, hardeners.

iii. Breathers, drying agents.iv. Terminal boxes, connection boxes, control cabinets and driving mechanisms.

v. Turrets with and without build-in current transformer.

vi. Fan, fan motors, pumps and coolers.

vii. Gas relays, oil level indicators, thermometers, flow indicators, manometers,explosion vents, pressure relay, valves etc.

viii. Manual operating gear.

ix. Paper to oil conservators, coolers, turrets ect.

x. Transformer wheels (transport arrangement).



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"The control cabinets shall be carefully be unpacked and stored in upright positionindoor. The heating element of the control cabinet could be electrically connected.Before such electrical connection all transport supports inside the cabinet must beremoved and carefully checked that nothing is in contact with the heating elements

inside the cabinet. Also the air holes for ventilation shall be checked to be open."

Only the part of HEATER illumination circuit of the control cabinet is to be electricallyconnected and all other parts are to be isolated.

Protection Earthing of the Control Cabinets is recommended during the storage andshall be arranged by connection to Earthing Clamp outside the Control Cabinets.

4.1.1.2 STORING OUT DOORS

i. Oil conservator with blanking plates for all opening.

ii. Radiators and coolers with blanking plates for all opening.

iii. Consoles & frames for oil conservator, coolers, control cabinets.iv. Lightning arrestors support.

4.1.1.3 CONDITION MONITORING OF TRANSFORMER/ REACTOR & ACCESSORIES

During the storing time, the storing place, transformer/ reactors, components andaccessories are inspected regularly. Observations, readings, measures and datesshould be noted in formats standardized and enclosed with this document. In case offaults or abnormal observation, immediate rectification action shall be initiated withintimation to RHQ.

Check at even intervals and further more during rain, storm, etc. the foundationmaterial (boundary beam etc.) and the condition of the ground.

Inspect the Transformer/Reactors periodically with regard to possible external faultsand or rust damages (say 6 monthly).

Check the heater condition and illumination of control panel at 6 monthly interval.Heaters in control panel are to be switched on manually on weekly basis.

If the Transformer/Reactor is only air/ Nitrogen filled, one should check air/ Nitrogenpressure. If the Transformer/ Reactor is oil filled, one shall take oil samples after 6months. The oil is to be tested for Break Down Voltage (BDV) and moisture content.

DGA of oil to be carried out in case the transformer/ reactor is energized earlier withhigh voltage. However prior to high voltage energization all pre-commissioning checksfor Transformer/Reactor as per CC/OS guidelines to be carried out.

All pumps and fans of spare Transformer/Reactor shall be operated on Monthly basisand any discrepancy noticed shall be rectified.



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Check the condition of the dehydrating material silica gel on 3 monthly basis fortransformer and transformer oil storage tank. The colour of silica gel shall be blue. Incase the colour of 50 % of volume of silica gel found to be pink, the same should bereplaced/re-generated.

4.1.1.4 BUSHING

On receiving, the bushing shall be carefully inspected with regard to transport damageand action shall be initiated in line with the terms and conditions stipulated in thecontract document. Please note that the bushing have been routine tested with bottomend immersed in oil and same oil may be left, especially in the narrow openingbetween porcelain and metal. If leakage is suspected the bushing must thus becarefully cleaned with solvent (alcohol) several times before a new tightness check ismade. The bushing may be stored horizontally up to 6 months. For storing over 6months it is recommended to place the bushing in the vertical position with the topbushing upwards or inclined with the top end upwards and at an angle of at least 5ο ormore based on manufacturer ‘s recommendation.

For long term storage several method can be adopted to keep the bushing at least 5 ο angle with top of end upwards. As per inventory norms, there may be 3/4 bushingsupplied as spare with each type, each make Transformer / Reactor. Normally thetransport casing is having heavy sleepers at the bottom. But it is preferred to prepare aplatform of concrete base in the outdoor with inclination of minimum 5ο or moredepending on manufacturer's recommendation such that natural storage can be madewith heavy sleeper at base. However, for Oil Impregnated Paper (OIP) bushings, thegasket surface and metal parts below the flange shall be covered with polythene orvinyl sheets to avoid rusting.

When the bushing has been stored horizontally (unless manufacturer recommendedthat they have some oil system which does not allow bubbles to form when the bushing

is in horizontal condition), it shall be raised with the top up at least 12 hr. before servicevoltage is applied and 24 hr. before test voltage is applied.

Corporate OS/ Manufacturer shall be referred to provide a suitable standard design ofstoring the nos. of bushing at a particular site/Regional store.

4.1.1.5 CONDITION MONITORING

It is mandatory that bushing is to be tested as follows:

i. Visual inspection for physical damages Monthlyii. Check oil leakage 6 Monthlyiii. Check the oil level in the indicator 6 Monthly

iv. Check the tan delta of bushing 5 Yearlyv. Check the capacitance of bushing 5 Yearlyvi. Check the bushing CT for the following

a. Insulation test Yearly

All the tests are to be documented in the format enclosed.



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4.2 CIRCUIT BREAKER

Upon delivery of equipment and before any handling, make sure that the cases andpacking used for transport are in sound condition and that no case is missing.

Immediately after receipt of any spares, inspection to be carried out, and in case ofdamages or missing items, a claim should be made in line with the terms and conditionstipulated in the contract agreement

In case of breaker transported with hydraulic operating mechanism as a factory

assembly unit. It is recommended not to remove the various assembly of the hydraulic

circuit before final erection. These obstructers prevent ingress of dust or foreign bodies

in the circuit during storage period.

As per inventory Norms breaker pole along with accessories are supplied as spares.

This breaker is to be preserved so that as and when required it shall be available for

further re-erection and use. The breaker spares should be stored indoor along withtheir packing cases.

In order to achieve this it is recommended that one or two foundation as per design

may be made near the open storage area which is approachable by crane etc. The

foundation shall be identical to the main foundation as made in the yard for similar

breaker. The complete breaker pole shall be erected on the spare foundation, same in

line with tile other breakers, but this requires suitable supporting structures and

provision is to be made in the LOA for the same.

The control cubicle and marshaling kiosks may be stored inside in case it is not

possible to erect with one pole column and interrupter. The kiosks and control cubicles

will be stored in the covered storage room free of corrosive atmosphere with heating

resistors switched on.

It is recommended to store all the loose parts of the circuit breaker indoors. The

following storage precautions shall be strictly adhered to.

i. The equipment is to be stored for more than 3 months or the weather is humid,switch on the anti-condensation heaters provided in the control unit, local controlcabinet and in the auxiliary switch box. The heater should be switched ONirrespective of weather condition.

ii. The hardware should be stored essentially in polythene bags and are keptindoors

iii. All the insulators should be stacked properly and stored in a safe place to

prevent damages to petticoats. Surfaces of sealing flanges should be protected

adequately.



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iv. The rubber pans like oil seals, gaskets, washers etc. should be stored in such a

way as to avoid mechanical damages and should be smeared with suitable

powder before storing. Store them in the covered storage room away from heat

and moisture to avoid deformation.

v. All the sealing surfaces and surfaces of terminal plates etc. should be protected

from damages during handling and storage. The open ends should be properly

sealed with Teflon/ polypropylene covers/caps to prevent ingress of moisture

vi. The operating rods are wrapped in a polythene paper with silica gel bags to

protect them against moisture. As soon as the rods are received check whether

the silica gel is still effective.

Blue color -Silica gel effectivePink color -Silica gel absorbed moisture. Requires reconditioning

If the color of the silica gel is pink, unpack the operating rods carefully by cutting

open at a suitable point and replace the silica gel. Carefully re-seal the

polythene paper using tape since moisture will penetrate even through the

smallest hole.

Note: Do not open sealed tins containing hydraulic oil and filter material till the

time of usage.

vii. Tools, accessories and SF6 gas handling equipment should be stored inside

covered storage area. Care should be taken to cover them with polythene to

prevent deposit of dust and other foreign bodies. Periodic condition monitoring

of gas handling unit shall be ensured by running it for 10 to 15 minutes after aninterval of I Year. While not in use, it is preferred that the gas handing unit is

jacked (if provided) and all pressures from the tire may be maintained.

viii. The metallic joints of the pneumatic system should always be covered with

shellac paint to avoid oxidation during storage period.

ix. Control block, Contractors, Relays, Coils, and Switches etc. should be stored

with polythene covered.

x. Consumption of various items shall be on FIRST IN and FIRST OUT basis.

Each item should be identified for its self life and a label is to be marked on thestorage item regarding its delivery date and expiry date etc. These items shall

be checked for physical damages and regular intervals to make it serviceable.



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4.2.1 CONDITION MONITORING OF BREAKER

i. Visual inspection for physical damages of breaker & accessories Monthly

ii. Checking of SF6 gas pressure (positive pressure) in the poles 6 Monthly

iii. Clean & Check heater condition of MOM box 6 Monthly

iv. Insulation test Yearly

v. Tan delta & Capacitance measurement of Grading Capacitor 5 Yearly

All the tests are to be documented in format enclosed.

4.3 132 / 220 /400kV CURRENT TRANSFORMER & DCCT

The current transformer is normally transported in a strong wooden case. In order to

clearly indicate the correct position of the case during transportation, the standardsymbols are normally used and is written normally on the case. Like: This side up/Fragile / Lift here / Center of gravity.

The current transformer is dispatched in horizontal condition due to transport limitationin height. If required it can be stored for a shorter duration say 6 Months in horizontalcondition within own packing cases. After receipt of spare CT a thorough externalexamination always be made immediately to see noting is damaged / missing. Checkfor any oil leakage and inspect the paint work. Notification of the same should beinformed in line with the terms and condition stipulated in the contract document.

The CT in vertical position should be lifted only by lifting lugs on the bottom of the tankusing the sling guides provided on the top chambers. For long term storage it is

recommended that the CT shall be stored on the foundation in a vertical position. Thefoundation is to be prepared near to the open storage area and the foundation level isminimum 300 mm above the ground level or HLF which ever is higher. It is also to beensured that crane-able road is available near to the CT foundation for futurerequirement. Since the structure of CT is not a part of spare, it is recommended that asmall structural work using C-channels/I-beam may be prepared to suit the foundationbolts and CT base hole. In case it is difficult to prepare a structural work CT may beinstalled directly on the foundation. However foundation bolt casting shall be made tomatch with the base hole of the CT.

In case suspected damage to the insulator by un-intentional act or fly object, it isrecommended that wooden planks/covers shall be provided on surfaces.

Further it also to be ensured that the foundation bolts are tightened properly same inline with the CTs erected in the bay. Ensure that the terminals in the secondary sideare shorted and connected to earth. Also the primary terminal P1 and P2 are shortedand connected to earth.



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4.3.1 CONDITION MONITORING

i. Visual inspection for physical damages Monthly

ii. Check oil leakage 6 Monthly Check the oil level in the indicator 6 Monthly

iii. Check the tan delta of bushing 5 Yearly

iv. Check the capacitance of bushing 5 Yearly

v. Check the bushing CT for the following



4.4 132/220/400kV CVT & DCVD (DC Voltage Divider)

Same in line with CT the CVTs/DCVD are to be stored on foundation in verticalposition in the open storage are near to Current Transformer. Also it is to be ensuredthat the Sl. Nos. for all the stacks of CVT shall be identical. Since the mountingstructure is not a part of CVT/DCVD spare, it is suggested to keep the CVT/DCVDdirectly on foundation or fabricate a small structure using I-beams and/or C-channel tomatch the foundation bolt and base of CVT. Further the HV terminal is to be shortedand grounded.


i. Visual inspection for physical damages Monthlyii. Check oil leakage 6 Monthly

iii. Check the oil level in the indicator 6 Monthly

iv. Check the tan delta of CVT/DCVD 5 Yearly

v. Check the capacitance of bushing 5 Yearly

vi. Check the CVT/DCVD for the following



4.5 INSULATOR

Normally the disc insulators are dispatched from the manufacturer works to site bywooden crates. However before storing, it is to be inspected for physical damages, ifany. For long-term storage it is recommended that the crates are to be protected fromrain and white ant etc. The insulator crates are to be kept under a covered area asindicated in the Diagram -I on a raised platform near to the closed store. The raised



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platform (min. 300 mm from the ground level or HFL which ever is higher) shall be filledup with fine sand in order to avoid weed growth and chipping of insulators. In case it isnot possible to store insulators in closed space in that case it can be stored in openspace with sand cushioning of minimum 3 inch. Further the nos. of stacks shall be

limited to 3 or 4 depending upon the space requirement and condition of the packingwood. Loose insulators may be repackaged into wooden crates and stacked properly.The each type of insulators are to be staggered and stored by providing identificationmarkings indicating make, EMS value. Monthly condition monitoring shall be carriedout by physical external damages etc.

The insulator stock in the stores is to be used first. And the fresh arrivals may be

stocked for upcoming stations.

4.6 TOWER PARTS

As per the 0&M norms complete tower shall be stored at Sub-station which are being

identified by the region. The tower members shall be stored on a raised platform (min.

300 mm from the ground level or HFL which ever is higher) and it is to ensure that no

water stagnation in and around the storage area even in the monsoon. The platform

shall be an area of approximately 1000 sq. m. However area can vary depending upon

the actual quantity of spare towers. The platform may be prepared on providing Brick /

stone pitching. All members and plates shall be marked according to tower BOQ and

all similar members of all complete spare towers shall be stacked and tied by

galvanized steel wire. For easy locating identification plates are to be provided near to

each type and design of towers.



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4.7 TOWER ACCESSORIES AND HARDWARE FITTINGS

Tower accessories and hardware fittings (AIum. parts only) are to be stored inside

covered storage area preferably in the racks and all other steel parts are to be stored

near to tower parts in open storage area. Each type of hardware and fittings are to be

staggered and stored by providing identification markings indicating make, type and

other details for quick retrieve.

4.8 MOTOR AND PUMP

If the motors and pumps are stored for a long time at the site, it is necessary that

certain precautions are to be taken to safeguard the motors and pumps. Motors /

pumps must be stored in packed condition with polythene cover and silica gel intact in a

covered storage shed to avoid ingress of moisture and dust. The motors / pumps

should be stored in places where there is no excessive vibration, as this would

otherwise damage the bearings. While handling under no circumstances the motors/

pumps should be dragged on the floor or handled as otherwise this will spoil the finely

ground feet which will ultimately disturb the alignment of the motor / pump. Spare

motors and pumps are to be used replacing the installed equipment during annual

maintenance in a cyclic fashion.

4.9 OPERATING DEVICE FOR BREAKERI ISOLATOR

A check for possible damages to the operating device shall be made during unpacking.

The device should preferably be stored indoors. The heater should always be switched

on in order to prevent condensation of moisture. In order to avoid entry of dust particles

it is to be ensured that the doors are properly closed and all holes are blocked except

breathing hole. Further the gear and other moving parts are to be lubricated as per the

manufacturer's recommendation.

4.10 CABLE, CONDUCTOR AND CABLE DRUM

The cable are either wound on reels or drums or supplied in coils packed and labeled.

The label which shall be securely attached to the reel or drums or coil shall have the

following information:

i. Name of the manufacturer

ii. Trade name, if anyiii. Nominal sectional area of the conductor of the cable

iv. Type of cable and voltage rating

v. Numbers of cores andvi. Length of the cable, contained in the coil or drum



01-12-2004

DOC No : D-1-10-XX-01-02


It is recommended that all similar type of cut piece cables may wound on the steel cable

drum indicating the length of cables with proper identification marking of the drums for

easy finding in future. The above data also to be maintained for proper storage and

inventory purpose.

The stock lying in the stores need to be used first and the fresh arrivals to be stored for

upcoming stations. While in storage the ends of the cables be kept properly scaled to

prevent any ingress of moisture.

For long term storage it is recommended that all control and power cable drums arc to

be protected from rain, white ant etc. and both ends of the cable are sealed with cable

sealing compound. The cable drums are to be kept under a covered area as indicated

in the DIAGRAM -I on a raised platform near to the closed store with ramp entry for

easy handling. The raised platform (min. 300 mm from HFL or the ground level which

ever is higher) shall be filled up with fine sand or PCC" based on cost analysis in order

to avoid weed growth.

Conductors and earth wire shall be rolled on steel drums with proper tightening at both

ends and stored on outdoor raised platform.

4.11 CAPACITOR

Check that the capacitors have not been damaged in transit. The goods may be heavy

and bulky. Therefore ensure that a lifting device is available for unloading purpose. In

case the units are transported as individual, care must be taken to ensure that the

bushings arc properly protected and not to be used for handling purpose. Unless the

capacitor arc to be installed immediately after delivering they must not be stored in wetpackaging. Capacitors for outdoor installation should therefore be unpacked on delivery

or stored indoors. Capacitors for indoor installation must not be stored outdoors. It is

recommended that the capacitors stored inside for long term preservation purpose may

be kept in vertical position and initial capacitance measurement may be performed to

keep the base data.


i. Visual inspection for physical damage Monthly

ii. Check oil leakage 6 Monthly

iii. Check the capacitance 5 Yearly



01-12-2004

DOC No : D-1-10-XX-01-02


4.12 RESISTOR

The webs must be inspected for external damage and stored in the covered storage

area. The insulators (if transported in complete assembly condition) shall be checked

for crack, external damages etc. prior to storing.


i. Visual inspection for physical damages Monthlyii. Measure resistance 5 Yearly

4.13 AIR CORE REACTOR/FILTER REACTOR

All the long term spares dispatched should be carefully examined upon arrival for transitdamage. In case transit damage is found, a claim should be filed immediately in line

with the terms and conditions stipulated in the contract agreement.

The majorities of air core reactors are designed for outdoor applications and can be

stored outdoors without further protections. If there is any doubt the environmental

condition of any substations where it is to be stored, the items should be stored indoors

and if required the manufacturer may be consulted.

4.13.1 CONDITON MONITORING


ii. Measure 5 Yearly

4.14 CONTROL RELAY PANEL AND PRINTED CIRCUIT BOARDS

Upon receipt of the control and relay panel it should be inspected for any physicaldamage. It is recommended that the relay is kept in its shipping carton until it isinstalled. The place where the relay is stored should be dry and free from dust andshould have normal room temperature. When a relay cubicle is stored for a longer

period of time in an unheated control room with a relatively high humility, for example ina new installation, and without being taken into service, a cubicle should be equippedwith a heater which is connected in immediately.

For long term storage of relays and its accessories that the relay may be kept in itsoriginal packing and it is to be ensure that all screws and units are securely tightened (ifprovided). Check that the relays have the correct data and it should be tested for checkmeasurement prior to storage in clean, dust free and dry place.



01-12-2004

DOC No : D-1-10-XX-01-02


The printed circuit boards may be kept in its original packing and it is to be ensured thatall electrostatic protection covers shall be intact along with polythene. The PCBs arealso to be checked for their functional checks prior to storage.

4.15 LINE TRAP AND SURGE ARRESTOR

The line trap, coupling capacitor, surge arrestor etc. are to be stored outdoor on theraised platform. There is no need for foundation for SA to be erected vertically as SAparts are dispatched to site with nos. of stacks. Each stack shall be stored separately.However, LMUs, Balancing transformers, surge counters and monitors are to be storedindoors.

4.15.1 CONDITON MONITORING


ii. Insulation test for Surge Arrestor Yearly

4.16 TESTING INSTRUMENTS

All the testing instruments are to be stored in dust free atmosphere and preferably inthe air conditioned area. The calibration and checking at various testing labs are to befollowed as per guidelines issued by CC/OS.

4.17 TRANSMISSION LINE AND SUBSTATION TOOLS

The tools and plants which are used in the transmission lines and substations are to bestored properly such that as and when required it is to be used safely. Regardless ofownership, tools are subject to inspection. The use of tools considered defective upon

inspection shall be prohibited.

The following tools and plants for transmission line and substation may be stored indoors and to be inspected at an interval for its operation whenever applicable.

i. Ladder – The ladder should be maintained in good condition or removed fromservice if found unsuitable. Ladders shall not be painted, a protective coating ofclearly varnish, linseed oil or other transparent non conductive coating shall beused.

ii. Hand tools – Hand tools like metallic tape, metallic ruler or fabric tapes, portableelectric tools, pneumatic air tools, jack hammer, jacks, hydraulic tools, chains andhoists, tool bag etc are to be stored indoors and are to be inspected or their

smooth operation and wherever required lubrication has to be carried out.

iii. Personal protection equipment – Personal Protection Equipment like safetyhelmet, safety belts, goggles, safety glasses, face shields, eye protection,protective aprons, industrial protective gloves, high voltage rubber gloves,,respirators etc are to be stored indoors and inspected periodically for wear andtear etc.



01-12-2004

DOC No : D-1-10-XX-01-02


iv. POWERGRID vehicles must be kept under proper storage condition while notunder operation.

v. All lub oils, SF6 gas, Freon gas etc are to be stored in the storage shed in anisolated location in vertical position.

vi. Trailers: Trailers must be attached to vehicles with approved safety hitches andsafety chains that are in good condition. Trailer wheels should be blockedwhenever trailers are being coupled or uncoupled.

vii. Tractors, loaders, forklifts: loaders and forklifts when parked must havebuckets or forks lowered onto ground or floor.

viii. Oil filtration machines and oil storage tank should be kept on the cemented flooror hard surface and it is to be ensure that there should not have any vegetationgrowth around the machines. It is preferably be kept under covered shed (maynot be inside storage shed). The oil filtration machine shall be jacked up (ifprovided) while not in use and wheel pressures are to be maintained. All the

preventive maintenance are to be carried out as per the recommendations of themanufacturer. Further trial operation of filter machine regarding all the functionalchecks should be carried out once in 6 months.


i. Hot line tools a. Visual Inspection for physical damages etc. Monthlyb. Insulation measurement Yearly

ii. ERS except insulator/All partsa. Visual inspection for physical damages and Monthly

general cleanness etc.

iii. Insulator of ERSa. Visual Inspection for physical damages etc. Monthlyb. Insulation measurement Yearly

iv. All parts of ERSa. Visual Inspection for physical damages & Monthly

general cleanness etc.

v. TOOLS AND PLANTS

a. Start mobile crane after checking coolant & lubrication Weekly

b. Greasing of bearings, slings etc of mobile crane Monthlyc. Washing and greasing of jeeps. Trailers and brake Vans. Monthlyd. Tension stringing equipment – Starting of Tensioner, Monthly

puller and other devices.e. Check condition of dehydrating material (silica gel) 3 Monthly

of oil storage tank.



01-12-2004

DOC No : D-1-10-XX-01-02


f. Inspection of Safety belts, electrical hand gloves, 3 Monthlyrubber mat, Artificial respirator etc.

g. Other items of tension stinging equipment Greasing and 6 MonthlyChecking for smooth operation.

h. Check operation of vacuum pump and heaters Oil filter M/C. 6 Monthly

i. Check condition of all filter papers oil filter M/c. 6 Monthly j. Check BDV & Moisture of oil in oil storage tank. 6 Monthlyk. Check working of SF6 filling and recycling equipment Yearlyl. Check healthiness of hydraulic jacks Yearlym. Check working of Dry air generator equipment Yearlyn. Insulation resistance Test of all electrical Hand Tool Yearlyo. Inspection of other items like slings, ropes, Yearly

derricks used for substation equipment.p. Greasing of Reactor Wheels Yearly

Miscellaneous Checks

i. The condition and material contains of Fire fighting appliance:

a. Water Buckets Monthlyb. Sand Buckets Monthlyc. Chemical Extinguishers Monthlyd. Hydrants Monthly

ii. De-weeding of complete storage area 6 Monthlyiii. Clean storm water drains and sumps around store area Yearlyiv. Check fencing around the storage complex Yearlyv. Attending water seepage in all building Yearlyvi. Chemical treatment against reptiles outdoor Yearlyvii. White washing of all storage building/shed 2 Yearlyviii. Painting of doors and windows 2 Yearlyix. Painting of oil handling plant/oil storage tank 5 Yearly

x. Anti termite treatment in Indoor stores/ sheds 5 Yearly

CONCLUSION :

The equipment spare parts and testing instruments etc. are to be preserved in a safestmanner and the summery of total preservation is indicated in TABLE-I.

The condition monitoring of various substation equipment and transmission line aretabulated in TABLE-II.

The detail procedure of various testing recommended in the condition monitoring shallbe a part of maintenance document, which is being prepared by CC/OS. Also part of

testing procedures already documented in Pre-commissioning procedures and formatsfor substation bay equipment.

The responsibility of carrying out of Inspection/Testing of spares shall be with Storesofficer and Maintenance Engineer and the records of all tests shall be documented asper the enclosed formats TABLE-III with this document. Further these documents shallbe checked and countersigned by SUBSTATION INCHARGE/GROUP HEAD.



01-12-2004

DOC No : D-1-10-XX-01-02


GENERAL LAYOUT

OF

STORAGE AREA



01-12-2004

DOC No : D-1-10-XX-01-02


DIAGRAM - 1



01-12-2004

DOC No : D-1-10-XX-01-02


TABLE

FOR

PRESERVATION PROCEDURES



01-12-2004

POWERGRID PRE

PRESERVATION OF SPARE PARTS AND SPECIAL TOOLS AND PLANT

Sr.No. Equipment Name Component Details Place(Indoor/Outdoor)

Location (StorageShed/Open Store)

Sp

1.0

2.0

3.0

4.0

Circuit Breakers

Isolators

CurrentTransformer

VoltageTransformer/DCVD

I. Complete Pole of circuitbreaker with pole columnand interrupter with M.B.(ifPossible)

II. Operating mechanism

III. Arcing Contacts, movingcontacts

IV. Relays, contactors,switches, coils, pushbuttons etc.

I. Isolator arms with male andfemale contacts(components).

II. Motor operating mechanism(MOM)

I. Complete CT

II. Terminal connectors

I. Complete CVT/DCVD

OUTDOOR

INDOOR

INDOOR

INDOOR

INDOOR

INDOOR

OUTDOOR

INDOOR

OUTDOOR

OPEN STORE

STORAGE SHED

STORAGE SHED

STORAGE SHED

STORAGE SHED

STORAGE SHED

OPEN STORE

STORAGE SHED

OPEN STORE

CR



01-12-2004

POWERGRID PRE

Sr.No. Equipment Name Component DetailsPlace

(Indoor/Outdoor)Location (StorageShed/Open Store)

Sp

5.0

6.0

7.0

Surge Arrestor (LA)

Insulator

Transformer/

Reactor

II. Terminal Connectors

I. Complete LA with insulatingbase

II. Surge counter/monitorIII. Terminal Connectors

Bus post InsulatorPost insulator for IsolatorString Insulator

a) Insulation material such as

papers, bakelite, wood,cotton tapes etc,Chemicals as solvents,glues, varnishes,hardeners, Breathers,drying agents.

b) Fan, fan motors, pumpsand coolers.

c) Gas relays, oil levelindicators, thermometers,flow indicators,manometers, explosionvents, pressure relay,

valves etc.d) Terminal boxes, connection

boxes,control cabinets anddriving mechanisms.

INDOOR

OUTDOOR

INDOORINDOOR

OUTDOOROUTDOOROUTDOOR

INDOOR

INDOOR

INDOOR

INDOOR

STORE ROOM

OPEN STORE

STORE ROOMSTORAGE SHED

COVEREDCOVEREDCOVERED

STORAGE SHED

STORE ROOM

STORE ROOM

STORAGE SHED

RA

D

D

D



01-12-2004

POWERGRID PRE



Sp

8.0

9.0

10.0

Fire Fighting/ ACSystem

PLCC

Batteries(220V/110V/50V/24

V)

e) Components of OLTCf) Transformer wheels

(transport arrangement)g) Blanking plates for all

opening including radiatorsand coolers

h) Bushing

Spares for Pumps /DieselEngine/ Motors/Valves/Filter(Fine/Course)/ NRV/Gaskets/

Compressor /Condenser

Control panel accessories.

Wave trap

Terminal connectors, CouplingDevice,

Coaxial Cable.

Spare battery cell, Terminalconnectors with bolts Nuts,

Float level indicators, Ventplugs.

INDOOROUTDOOR

OUTDOOR

OUTDOOR

INDORE

INDORE

OUTDOOR

INDOOR

INDOOR

INDOOR

STORE ROOMCOVERED

OPEN STORE

OPEN STORE

STORAGE SHED

STORE ROOM

OPEN STORE

STORAGE SHED

STORAGE SHED

STORAGE SHED

W

C

D

RA

S



01-12-2004

POWERGRID PRE



Sp

11.0

12.0

13.0

14.0

15.0

16.0

220V/50V BatteryChargers

C&R Panels

LT switchgear

Lighting

Tertiary Equipment

Bus Bar Equipment

Set of Control Cards, Set ofrelays, Rectifier transformer,Control transformer, Seriesinductor, Set of contactors,Micro-switches, FilterCapacitors, Three phase fullwave bridge rectifier assembly.

Relays (Main relay, Aux.Relay, timers etc.). Eventloggers, disturbance recorder,printer, Distance to faultlocators, Energy meters,

Recorders (Voltage &frequency), power supplymodules, PCBs etc.

Relays, CTs and PTs,Switches/Push buttons,contactors, TPNSwitches/MCCB, LT BreakersparesAll materials for light fixturesand fittings

Surge Capacitor with

connector etc.Clamps and connectors-Al.pipe bus 4_ Dia or more,Rigid connector, Slidingconnector, Corona bell.Corona rings.

INDOOR

INDOOR

INDOOR

INDOOR

INDOOR

INDOOR

STORE ROOM

STORE ROOM

STORE ROOM

STORE ROOM

STORAGE SHED

STORAGE SHED

D

(A

D(A

D

D



01-12-2004

POWERGRID PRE



Sp

17.0

18.0

19.0

20.0

Transmission Lines

Cable/Conductor

HVDC/SVC

Special TestingEquipment

Tower parts & Steel Hardwarepart,

Earth wire, conductor, insulatorAccessories for conductor,earth wire and hardwarefittings (Aluminium)

Cables of all sizes

All conductor, Earth wire

Thryistors, Resistors,

Capacitors, Water/PEX pipes,Light guides, Connections,Valve cooling systemequipment, control andprotection cards, Power supplymodules, Mother boards,control panel and Mimic boardspars etc.

Coupling Capacitors

Neutral Bus Switches

Relay test kilt, Breaker timingkit. Tan delta kit Primaryinjection kit, Multimeter,Megger etc.

OUTDOOR

OUTDOOR

INDOOR

OUTDOOR

OUTDOOR

INDOOR

OUTDOOR

INDOOR

INDOOR

OPEN STORAGE

COVERED SHED

STORE ROOM

COVERED SHED

OPEN STORE

STORE ROOM

OPEN STORE

OPEN STORE

STORE ROOM

P

RA

D

(AI

RA

D



01-12-2004

POWERGRID PRE



Sp

21.0

22.0

23.0

24.0

PLC Equipment

AC/DC HarmonicFilter

Tools and Plants

Hot Line Tools

PLC filter reactor,PLC filter capacitor element.

Tuning Units

Capacitor Cans

Resistor elementsReactorArrestorNeutral Bus Surge Arrestor.

Truck mounted craneHydraulic

Transformer oil tank 5-15 KLDry air generatorIPS Bending machineHydraulic conductor cuttersEqualizer pulley, Swivel jointfor conductor

Wireless sets

Welding m/c with its own

Diesel engine

All tools

OUTDOORINDOOR

INDOOR

INDOOR

INDOOROUTDOOROUTDOOROUTDOOR

OUTDOOR

OUTDOORINDOORINDOORINDOORINDOOR

INDOOR

OUTDOOR

INDOOR

OPEN STORESTORAGE SHED

STORAGE SHED

STORAGE SHED

RACKSOPEN STOREOPEN STOREOPEN STORE

STORE ROOM

COVEREDSTORAGE SHEDSTORAGE SHEDSTORAGE SHEDSTORAGE SHED

STORE ROOM

COVERED

STORE ROOM

RA

RARARA

D

D



01-12-2004

POWERGRID PRE



Sp

25.0

26.0

27.0

EmergencyRestoration System

Tension StringingMachines/Tools forLines

Miscellaneous

Columns/Boxes

Other T&P/ Accessories/Insulator

Puller/Tension motorizedwinches etc.

Other T&P

Lub oil. Freon, SF6, Petrol &Diesel, Chemical etc.

OUTDOOR

OUTDOOR

OUTDOOR

INDOOR

INDOOR

OPEN STORE

OPEN STORE

COVERED OPENSHED

STORE ROOM

STORAGE SHED

INRA



01-12-2004

DOC No : D-1-10-XX-01-02


TABLEFOR

CONDITION MONITORING CHECKS



01-12-2004

POWERGRID PRE

CONDITION MONITORING FOR SPARES OF TRANSMISSION SYSTEM EQUIPMENT AND SPECIA

SNO. EQUIPMENT NAME CONDITION MONITORING TYPEFREQUENCY

REMARKS

1.

2.

Circuit Breakers

Current Transformer

a) Visual Inspection for physicaldamages etc. of breaker andaccessories.

b) Tan delta & Capacitancemeasurement of Grading capacitor

c) Insulation testd) Maintain the SF6 gas pressure of

approx.0.3 bar.

e) Clean & Check Heater for ControlBox.

a) Visual Inspection for physicaldamages etc.

b) Check oil leakage

c) Check the oil level in the indicator.

d) Check the tan delta of CT

e) Check the capacitance of CT

f) Check the CT for the following.Insulation Test

Monthly

5 Yearly

Yearly6 Monthly

6 Monthly

Monthly

6 Monthly

6 Monthly

5 Yearly

5 Yearly

Yearly

Repair/replace wherevedamage of glazing apply

Tan delta <0.007 at 20°For capacitance check t1000 Mohm with 5kV meFill up if required.

With blower & vacuum c

Repair/replace wherevedamage of glazing apply

Rectify if leakage is obs

In case level is lower, lo

Tan delta<0.007 at 20°C

Check the factory test v

1000Mohm with 5kV me



01-12-2004

POWERGRID PRE


REMARKS

3.

4.

5.

6.

7.

VoltageTransformer/DCVD

Isolators

Surge Arrestor(LA)

Insulator for line &S/S

Transformers/ Reactors


b) Check oil leakagec) Check the oil level in the indicatord) Check the tan delta of CVTe) Check the capacitance of CVTf) Check the CVT for the following

i) Insulation Test

a) Visual Inspection for physicaldamages

b) Greasing of Male and Femalecontacts

c) Clean & Check heater condition ofMOM box.


b) Insulation test

Visual Inspection for physical damages

a) One complete set of blanking plateswith marking are to be inspected forrust, corrosion etc.

Monthly

6 Monthly6 Monthly5 Yearly5 Yearly

Yearly

Monthly

Yearly

6 Monthly

Monthly

Yearly

Monthly

6 Monthly

Repair/replace wherevedamage of glazing applyRectify if leakage is obs

In case level is lower, lo

Tan delta<0.007 at 20°C


Min.1000Mohm with 5kV

megger,min.1MΩfor sec

Repair/replace whereve

Remove rust wherever

With blower & Vacuum

Rectify / Repair/replace of slight damage of glaz

Min.400 Mohm with 5kV

Repair/Replace wherevedamages of glazing app

Remove rust.



01-12-2004

POWERGRID PRE


REMARKS

7.

8.

BUSHING

Rotating/Movingparts of equipment

b) Check the condition of dehydratingmaterial (Silica gel) of

c) Operate the pumps and cooler

d) DGA and other oil tests (BDV &moisture) of Transformer/Reactor(DGA only if it is energized).

e) Pre-commissioning checks as perOS guidelines

f) Illumination and space heater ofControl box.


b) Check oil leakagec) Check the oil level in the indicatord) Check the tan delta of bushinge) Check the capacitance of bushingf) Check the bushing CT for the

followingi) Insulation Test

All Bearings, Gears, Sleeves, shaftsetc. Greased.

3 Monthly

Monthly

6 Monthly

ONCE

6 Monthly

Monthly

6 Monthly6 Monthly5 Yearly5 Yearly

Yearly

6 Monthly

Regenerate if colour chaquantity.

Investigate any discrepa

Investigate if BDV<50kVthe leakage, breather, S

Check the results with fa


Repair/replace wherevedamage of glazing applyRectify if leakage is obsIn case level is lower, lo

Tan delta<0.007 at 20°CCheck the factory test v

Min.1000mohm with 5kV

Remove rust before fres



01-12-2004

POWERGRID PRE


REMARKS

9.

10.

11.

12.

13.

Batteries(220V/50V)

Cable

AC/DC filterFilter Capacitor

Air core

Reactor/FilterReactor

Filter Resistor

Hot line tool

ERS exceptinsulator/AI parts

Insulator


a) Insulation test betweenCore - CoreCore - Armour


b) Check oil leakagec) Check the capacitance Value.

a) Visual Inspection for physical

damagesb) Check Reactor Inductance


b) Measure resistance


b) Insulation measurement

a) Visual Inspection for physicaldamages and general cleanness etc.


b) Insulation measurement

6 Monthly

3 Yearly3 Yearly

Monthly

6 Monthly5 Yearly

Monthly

5 Yearly

Monthly

5 Yearly

Monthly

Yearly

Monthly

Monthly

Yearly

Remove rust before fres

Min.1 Mohm with 500V Min. 1 Mohm with 500V

Repair/replace whereve

Rectify if leakage is obsCheck the factory test v

Repair wherever applica





Min.400MΩ with 5kV me



Min.400 MΩ with 5kV m



01-12-2004

POWERGRID PRE


REMARKS

14.

15.

16.

All parts

Wave Trap

CR panel Relays

TOOLS ANDPLANTS

a) Visual Inspection for physicaldamages and general cleanness etc.


b) Insulation measurement of LA

Sectional checks for all spare relays.

Check working of SF6 filling andrecycling equipment.

Check healthiness of hydraulic jacks

Check working of Dry air generatorequipment.

Insulation resistance Test of allelectrical Hand Tool.

Start mobile crane after checkingcoolant and lubrication.

Greesing of bearings, slings etc. ofmobile crane

Inspection of safety belts, electricalhand gloves, rubber mat, artificialrespirator etc.Washing and greasing of Jeeps,Trailers and brake Vans

Monthly

Monthly

Yearly

Once

Yearly

Yearly

Yearly

Yearly

Monthly

Monthly

Yearly

Monthly



Min.1 Mohm with 500V


Rectify any discrepancy

With special regard to o

Rectify wherever require

Minimum 1 Mohm with 5

Check operation of all d


Replace defective once

Run these vehicles mini



01-12-2004

POWERGRID PRE


REMARKS

16 Miscellaneous

Tension stringing equipment-Starting ofTensioner, puller and other devices

Other items of tension stringingequipment Greasing and checking forsmooth operationInspection of other items like slings,ropes, derricks used for substationequipmentCheck operation of vacuum pump andheaters Oil filter m/cCheck condition of all filter papers Oilfilter m/c

Check BDV and moisture of oil in oilstorage tank

Check condition of dehydratingmaterial(silica gel) of oil storage tank

Check the condition and materialcontains of Fire fighting appliance

I) Water BucketsII) Sand BucketsIII) Chemical Extinguishers

IV) Hydrants

Deweeding of complete storage area

Clean storm water drains and sumpsaround store area

Monthly

6 Monthly

Yearly

6 Monthly

6 Monthly

6 Monthly

3 Monthly

Monthly

Quarterly

1 year (Before Mansoon)

Check operation of all d





Investigate if oil BDV < 5

Regenerate if colour chaquantity

Check and refill if requirValve for use.

Use chemical wherever

Use anti algae compoun



01-12-2004

POWERGRID PRE


REMARKS

17.0 Testing Instrument

Check fencing around the storagecomplex

White washing of all storagebuilding/shed

Attending water seepage in all building

Painting of doors and windows

Chemical treatment against reptiles

Calibration and functional checks

Yearly

3 yearly

Yearly

2 Yearly

Yearly

As OSguidelines


After rectifying defects i

Look for water stagnatio

Repair defects, if any

With special regard to s

Ref the document “ Stanreleased by CC/OS



01-12-2004

DOC No : D-1-10-XX-01-02


FORMAT

FOR

MONTHLY CHECK LISTS



01-12-2004

DOC No : D-1-10-XX-01-02


TABLE – III

MONTHLY CHECK LIST FORMAT FOR SPARES AND SPECIAL T&P

REGION : DATE OF LAST INSPECTION :

SUB STATION : DATE OF INSPECTION :

01. Visual Inspection for physical damages etc.

(Repair / Rectify wherever required)

EQUIPMENTNAME

TYPEVOLTAGECLASS

MAKE QTY OBSERVTION

Circuit Breakers

01

02

03

04

Isolators

01

02

03

CurrentTransformer

01

02

03

04

VoltageTransformer/

01

02

03

04

Surge Arrestor(LA)

01

02

03

04



01-12-2004

DOC No : D-1-10-XX-01-02


EQUIPMENT NAME TYPEVOLTAGECLASS

MAKE QTY OBSERVTION

Insulator for line & S/S

01

02

03

04

05

Bushing

01

02

03Filter Capacitor

01

02

03

Filter Reactor

01

02

03

Filter Resistor

01

02

03

Hot line tool

Air Core Reactor

01

02

03

ERS includinginsulator/Al partsnsulator

Wave Trap

01

02

03



01-12-2004

DOC No : D-1-10-XX-01-02


02: TRANSFORMER/REACTOR :

Operate the pump and cooler and investigate any discrepancy

EQUIPMENT NAME TYPE VOLTAGE CLASS MAKE QTY OBSERVTION

Pump

01

02

03

04

Cooler

01

02

03

04

03 : TOOLS AND PLANTS :

EQUIPMENT DETAILS/CHECK LIST REMARKS OBSERVATION

Tension stringing equipment-Startingof Tensioner, puller and other devices

Check operation of all devices

Start mobile crane after checkingcoollant and lubrication

Check operation of all devices

Greasing of bearings, slings etc. ofmobile crane

Remove rust whereverapplicable

Washing and greasing of Jeeps,Trailers and brake Vans

Run these vehicles minimum 0KM per week.

04. CHECK FOR THE COLOUR OF DEHYDRATING MATERIAL (Silica gel)

Regenerate if colour change is more than 50% of total quantity

EQUIPMENT MAKE & TYPE OBSERVATION REMARKS

01 Transformer

02 Oil Storage tank03

Note : The responsibility of carrying out of Inspection/Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group head/Station-in-charge.

Signature: Signature :Name : Name :Group head /Station-in-charge



01-12-2004

DOC No : D-1-10-XX-01-02


FORMAT

FOR

SIX MONTHLY CHECK LISTS



01-12-2004

DOC No : D-1-10-XX-01-02


6 MONTHLY CHECK LIST FORMAT FOR SPARES AND SPECIAL T&P



01: Visual inspection for Oil Leakage, Oil level in the indicator

EQUIPMENT NAME TYPEVOLTAGE

CLASSMAKE QTY OBSERVTION

Current Transformer

01

02

03

04Voltage Transformer

01

02

03

04

Bushing

01

02

03

Capacitor (Only oilleakage)

01

02

03

Oil storage Tank XX

Oil drums* XX

* Remove leaking drums from the storage area.



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DOC No : D-1-10-XX-01-02


02:I) Inspection of GAS pressure in SF6 Circuit BreakerII) Check for heater condition in Control boxes, Marshalling Boxes, Operating mech. Boxes etc.

Measure gas pressure 0.3 bar, if leakage observed, rectify

EQUIPMENT NAME TYPEVOLTAGECLASS

MAKE QTY OBSERVTION

Circuit Breaker

01

02

03

04

Isolator (Heater Condition)

01

02

03

Transformer Control Panel

03: Transformer / Reactor:

Equipment Details/Check List

Remarks Observation

a) One complete set of blanking plateswith marking are to be inspected forrust, corrosion etc.

Remove rust

b) Check the condition of dehydratingmaterial (Silica gel) of Transformer/ Reactor .(3 Monthly)

Regenerate if colour change ismore than 50% of total quantity

c) DGA and other oil tests ofTransformer/ Reactor

Investigate if BDV < 50 KV &moisture > 25 PPM of Oil, check forleakage, breather, Silica gel etc.

04: Physical inspection of Spare battery cells.

EQUIPMENT NAME TYPE AMPHR. MAKE QTY OBSERVTION

Battery(245V/50V /110V/220V

01

02

03



01-12-2004

DOC No : D-1-10-XX-01-02


05: ROTATING MACHINES

Equipment Details/

Check ListRemarks Observation

a) Greasing of male & femalecontacts of isolator

Remove rust, if noticed.

b) Bearings, gears, shafts,sleeves etc. including MOMbox gears.

Remove rust before applicationof fresh grease.

c) Other items of tensionstinging equipment Greasingand checking for smoothoperation

Remove rust whereverapplicable.

d) Check operation of vacuumpump and heaters Oil filterm/c

Rectify wherever required

e) Check condition of all filterpapers Oil filter m/c


f) Check BDV of oil in oilstorage tank

Investigate if BDV < 50 KV &moisture > 25 PPM of Oil,check for leakage, breather,Silica gel etc.

Deweeding of complete storagearea

Use chemical whereverpossible

Check the condition andmaterial contains of Fire fightingappliance

I) Water Buckets

II) Sand BucketsIII) Chemical

ExtinguishersIV) Hydrants

Check and refill if required andcheck the condition of Valve foruse

Note: The responsibility of carrying out of Inspection/ Testing of spares shall be with stores officer &Maintenance Engineer and the records of all tests shall be documented. This shall becountersigned by Group Head/ Station –in-charge.

Signature: Signature:Name: Name:

Group Head/Station-in-charge.

,



01-12-2004

DOC No : D-1-10-XX-01-02


FORMAT

FOR

YEARLY CHECK LISTS



01-12-2004

DOC No : D-1-10-XX-01-02


YEARLY CHECK UP LIST FORMAT FOR SPARES AND SPECIAL T&P



01: Insulation measurement of following spare equipment


CLASSMAKE QTY OBSERVTION & REMARKS

Circuit Breaker Min. 1000 MΩ with 5kV megger

01

02

03

Current Transformer Min. 1000 MΩ with 5kV megger

01

02

03

04

Voltage TransformerMin. 1000 MΩ with 5kV megger

& 1 MΩ with 500 v megger forsecondary

01

02

03

04

BUSHING CT Min. 1000 MΩ with 5kV megger

01

02

03

Surge Arrester Min. 400 MΩ with 5kV megger

01

02

Hot line tool Min. 400 MΩ with 5kV megger

ERS insulatorMin. 400 MΩ with 500kVmegger



01-12-2004

DOC No : D-1-10-XX-01-02




Cable Min. 1 MΩ with 500kV megger

Wave Trap LA Min. 1 MΩ with 500kV megger

Insulation resistanceTest of all electricalHand Tool

Min. 1 MΩ with 500kV megger

02: Tools & Plants

Equipment Details/

Check List Remarks Observation

Check working of SF6 filling and recyclingequipment

Rectify any discrepancy

Check healthiness of hydraulic jacksWith special regard to oil andbucket washer

Check working of Dry air generatorequipment


Insulation resistance Test of all electricalHand Tool

Minimum 1 Mohm with 500 Voltmegger

Inspection of safety belts, electrical handgloves, rubber mat, artificial respirator etc.


Inspection of other items like slings, ropes,derricks used for substation equipment


Clean storm water drains and sumpsaround store area

Use anti algae compound

Check fencing around the storagecomplex

Repair wherever applicable

Attending water seepage in all building Look for water stagnation / holesetc.

Chemical treatment against reptiles With special regard to snakes(wherever applicable)






01-12-2004

DOC No : D-1-10-XX-01-02


5 YEARLY CHECK UP LIST FORMAT FOR SPARES AND SPECIAL T&P



01: Tan δδδδ and Capacitance measurement of following spare equipment

EQUIPMENTNAME

TYPEVOLTAGE


Circuit BreakerGrading capacitor

Tan δ < 0.007 & checkcapacitance as per factoryTest result

0102

0304CurrentTransformer/

Tan δ < 0.007 & checkcapacitance as per factoryTest result

01020304

VoltageTransformer/ DCVC

Tan δ < 0.007 & checkcapacitance as per factoryTest result(+ 5%)

01020304

BUSHING Tan δ < 0.007 & checkcapacitance as per factoryTest result

010203

FILTER

CAPACITOR (onlyCapacitance)

Check capacitance as per

factory test results

010203



DOC No : D-1-10-XX-01-02


02: INDUCTANCE MEASUREMENT

EQUIPMENTNAME

TYPE VOLTAGECLASS

MAKE QTY OBSERVTION

FILTER

REACTOR

Check as per factory Test

results

010203

AIR COREREACTOR

Check as per factory Testresults

0102

03: RESISTANCE MEASUREMENT

EQUIPMENTNAME

TYPEVOLTAGE

CLASSMAKE QTY OBSERVTION

FILTERRESISTOR

Check as per factory Testresults

010203




preservation procedure and condition monitoring of spare parts of transmission system equipment and...

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