single phase meter electromechanical 240708

8/13/2019 Single Phase Meter Electromechanical 240708

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Distribution Section

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Maharashtra State Electricity Distribution Company Ltd.

Technical Specification for LT Single Phase Electromechanical Energy Meters

Specification No. DIST/MM-IV/015(Dt.24.06.2008)

Tender No. SP/T-1010/0608

INDEX

CLAUSE NO. CONTENTS Page No

1. SCOPE 2

2. QUALIFYING REQUIREMENT 2

3. SERVICE CONDITIONS 3

4. APPLICABLE STANDARDS 3

5. METER CONSTRUCTION 4

6. CONNECTION DIAGRAM & TERMINAL MARKING 117. NAME PLATE & MARKING. 12

8. INTERNAL CONSTRUCTION OF METER. 12

9. REFERENCE CONDITIONS FOR INFLUENCE 15

QUANTITIES.

10. TESTS 15

11. CHECK POINTS 17

12. ROUTINE TESTS 17

13. PACKING 18

14. TENDER SAMPLE 1815. PRE- DISPATCH INSTRUCTION 18

16. INSPECTION AFTER RECIEPT AT STORES 18

17. QUALITY CONTROL 19

18. MINIMUM TESTING FACILITIES 19

19. MANUFACTURING FACILITIES 20

20. ENCLOSURE OF METER 20

21. GAURANTEE OF METERS 20

22. SCHEDULES 21

SCHEDULE C 2223. ANNEXURE- I 23 To 25

24. Annexure UI 26.


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Maharashtra State Electricity Distribution Company Ltd.

Technical Specification for LT Single Phase Electromechanical Energy Meters

Specification No. DIST/MM-IV/015(Dt.24.06.2008)

Tender No. SP/T-1010/0608.

1.0 SCOPE:

This specification covers the Design, Manufacture, Testing and Supply of ISImarked LT AC 5-20 A electro-mechanical Energy Meters with suspensionbearing of accuracy class-2 suitable for measurement of Energy (kWh) inSingle Phase, Two wire system of LT Consumers.

2.0 QUALIFYING REQUIREMENT:-

2.1 I] Offers of only original manufacturers of L.T.A.C. Electromechanical Energy Metersshall be accepted against the Tender.

II] The following qualifying requirement shall be fulfilled by the bidders/

manufacturers

a. The bidder /manufacturer should have minimum three years experience of

supply or manufacturing of electromechanical meters up to the end of last

financial year.

b. Past Experience

Bidder shall have supplied 2,00,000 Nos.(Two Lakhs) of similar type ofmeters in any one year during last three financial years and shall have

successfully in operation for at least one year. Necessary documentation forabove shall be submitted along with the tender offer.

c. Field Performance

The actual field performance of the similar type meters supplied in theDistribution network (various utilities) shall be given due weightage fortechnical evaluation and placement of order.

d. Manufacturing capacity of meters.

The manufacturer shall have minimum manufacturing capacity of5,00,000 nos (Five Lakhs) of similar type of meters per year and the bidderhas to submit supporting document having various orders executed by them.

III] The offers of Indian subsidiary company, whose parent company is located abroadfulfilling the qualifying requirements shall be considered provided the Indianparticipant subsidiary company fulfils the minimum experience of three years ofsupply or manufacturing for Electromechanical energy meters upto the end of thelast financial year. However, the above conditions of supply of minimum quantity of2.0 lakhs Electromechanical energy meters during last three financial years can befulfilled by the parent company located in abroad on behalf of their Indian subsidiarycompany. The parent company shall furnish undertaking for accepting responsibilityfor supplying quality meters as per specifications and execution of the contract on


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behalf of its India based subsidiary unit who has participated in the tender inAnnexure U-I.

IV] In case of offers of Foreign bidders/manufacturers, they shall fulfill QualifyingRequirement as per Sr. No. 2.1 [I] and 2.1 [II] above.

3.0 SERVICE CONDITIONS

The meters to be supplied against this specification shall be suitable forsatisfactory continuous operation under the following tropical conditions:

Maximum ambient temperature (oC) 50

Maximum ambient temperature in shade (oC) 45

Maximum temperature of air in shade (oC) 35

Maximum daily average temperature (oC) 40

Maximum yearly weighted average temperature (oC) 32

Relative Humidity (%) 10 to 95

Maximum Annual rainfall (mm) 1450

Maximum wind pressure (Kg/mm2) 150

Maximum altitude above mean sea level (meters) 1000

Isoceraunic level (days / year) 50

Seismic level (Horizontal acceleration) 0.3g

Climate:- Moderately hot and humid tropical climate

Conducive to rust and fungus growth.

4.0 APPLICABLE STANDARDS:

4.01 The Meters shall conform to IS 13010/1990 (amended up to date) and IEC521.The specification given in this document supersedes the relevant clausesof IS:13010/1990 (amended up to date) wherever applicable.

The meter shall bear ISI mark.

The class of accuracy of the Energy Meter shall be 2.0. The accuracyshall not drift with time.

4.02 Current & Voltage Rating

The current rating shall be 5-20A.

Rated basic current (Ib) for L.T. Energy Meters shall be 5A.The maximumcontinuous current (Imax) shall be 400% of rated basic current.

Moreover

The 5-20A meters shall work accurately upto 150% of Imax i.e. 30Amps.


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The Voltage Rating shall be 250 Volts. The voltage range shall be (-) 40%to (+) 20% of rated voltage i.e. 150 Volts to 300 Volts.

4.03 Temperature

The standard reference temperature for performance shall be 27oC. Themean temperature co-efficient should not exceed 0.07%. Temperature riseshall be as per IS 13010/1990 (amended up to date).

4.04 Power Factor : The meter should work for Zero to unity PF ( All lag orlead).

4.05 Power Consumption

voltage circuit including power supply of meter at reference voltage,reference temperature & frequency shall not exceed 1.2 Watt & 6.0 VA.

Current Circuit : The apparent power taken by current circuit at basiccurrent, reference frequency & reference temperature shall not exceed 2.5VA.

4.06 Starting Current :- The meter should start registering the energy at 0.5%

of basic current (Ib) at unity power factor.

4.07 Frequency: The rated frequency shall be 50 Hz with a tolerance of 5%.

4.08 Speed of rotation : The speed of Meter Rotor at reference voltage shallnot exceed 72 rpm. at rated maximum continuous current.

4.09 Torque : The minimum torque shall be 4 gm-cm +/-10 % when the meteris under reference conditions carrying the rated basic current at unity powerfactor.

4.10 Efficiency Factor : The minimum efficiency factor shall be 1.2

Efficiency Factor =

Where Permanence factor =

Torque and speedcorrespond to the respective values when the meter is under referenceconditions carrying the rated basic current at unity power factor.

5.0 METER CONSTRUCTION

5.01 MATERIALS OF BASE/ COVER/TERMINAL COVER / TERMINAL BLOCK

The meter base, cover & terminal cover shall be of metallic or polycarbonatematerial as under. Bidder can quote offer either of the two or both type of meter.

Permanence factor

Power loss in voltage coil in watts.

Torque (gm-cm) X 100

Rotor weight (gm)X Rotor speed (rpm)

at Ib.


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5.01.1 METER WITH METALLIC BASE & COVER-

(a)CONSTRUCTION OF METER

The construction of the meter shall be suitable for its purpose in allrespects and shall be given reasonable assurance of continuous performancein all mechanical, electrical and magnetic adjustments. The constructionshall be such that the meter is not prone to produce audible noise in use.

The base as well as the cover of the meter shall be fabricated from high quality

strong pressed steel sheet, which would ensure maximum strengthagainst distortion and also against injury to the working parts duringnormal use and rough handling during transportation.

The press steel sheet shall be DD grade steel with water/dustproof groves. Thickness of sheet for base of the meter shall be 0.9 mmand for meter cover shall be 0.9 mm. DD grade steel shall be as per IS 513-1986 for cold rolled low carbon steel The meter case shall be providedwith U grove edge all around and sealing shall be provided byrubberized cotton cord / neoprene rubber cord gasket by providing

suitable adhesive.

The finishing of meter shall be provided with two coats of heavy coatingsynthetic solving enamel paint with gray shade so that it is durable, longlasting and prevent rusting.

(b) WINDOW GLASS FIXING ARRANGEMENT.

The window glass in case of non transparent cover shall bepositioned with correct pressure and clipped with stud with nut inside themeter. The fixing shall be such that it shall not be possible to insert anyexternal film of any kind viz. Xray film, packing strip, blade etc. into themeter .If any such foreign element can slide in to the glass window, metersshall not be accepted. The window glass shall be of thickness 3.0 mm to4 mm and shall be of toughened glass as per IS 2835-1985. Thesupplier shall submit certificate from toughened glass manufacturer forpurchase of proper quality of toughened glass.

The fixing of window glass shall be tight with single complete frame allaround and shall permit clear view of register. The window cover shall bedust/moisture proof and shall not be removable from outside withoutdamage. The minimum clearance between window glass and rotor disc shallbe 8 mm.

c) METER COVER FIXING ARRANGEMENT.

At least two sealing screws of tinned brass or nickel plated steel shallbe provided for proper fixing of meter cover. Each sealing screw shall haveminimum two independent sealing holes. One hole shall be provided in thehead and one in the threaded portion, so that two separate seals can beprovided. The diameter of the hole shall be minimum 2.0 mm andminimum 1.5 mm for the head and threaded portion respectively.Rubberized cotton cord or Neoprene cord shall be used as gasket for fixingthe meter cover over the body .The length of the sealing screws shall be


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long enough to flush with the ground.

d) METER BASE FIXING ARRANGEMENTS:

Single Phase Meter shall have two fixing holes, one at top & other at bottom.The top screw hole shall be provided on back of the meter so that screwhead are not accessible after the meter is fixed. Lower hole shall beprovided inside the terminal compartment so as to make them in accessible

to an unauthorized person after terminal cover is fixed.e) SEALING ARRANGEMENT.

The sealing screw used for the meter cover shall be fixed up side downso that these are tightened from the rear. The sealing screw shall beBRASS or Nickel plated steel. In addition to the sealing screws provided forthe meter cover, there shall be one or two similar tinned brass or nickel platedsteel sealing screw for the terminal cover .The meter shall be suppliedhaving metal base and cover to be fixed mechanically i.e. by rivet on boththe ends with company logo such that it should not be possible to open thecover at site so that once the meter is manufactured and tested at

factory ,it should not be open except the terminal cover .The rivet shouldbe diagonally fixed.

f) INSULATION MATERIALS:

All insulation materials used in the construction of meter shall besubstantially non hygroscopic.

g) PROTECTION OF PARTS:

All parts which are subject to corrosion under normal working conditionshall be effectively protected against corrosion due to atmosphericcondition. The protection coating shall not be liable to damage by ordinaryhandling or injuriously affected by exposure to air under normal condition ofservice in actual practice in Gujarat state.

h) SCREW INSULATION:

All electrically live screws shall be of heavily tinned brass or nickel plated steel.All other screws shall be electroplated.

i) TERMINAL BLOCK:

(i) MATERIALS FOR TERMINAL BLOCK: The terminal block shall bemolded from phenol formal- dehyde insulating powder as per IS: 1300-1966 forPhenol molding materials Grade 7 and shall be replaceable type. The terminalblock shall be enclosed in a metallic house (preferable steel plated house) to

cover its back and sides to give sufficient strength, particularly for the purposeof tightening the fixing screws.

(ii) TYPE OF TERMINAL BLOCK AND COVER:

The terminal block shall be short type and its cover shall be openextended type and shall enclose terminal compartment except for theprovision of conductor entry at the bottom for incoming and outgoing leads.The cover shall be extended type & open type. Thickness of terminal cover shallbe 0.9 mm + 0.09 mm (i.e. same as cover and base) and it shall be made from


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pressed steel sheet. The terminal block shall be of materials whichcomplied with the requirement with at method FH-1 as per IS: 11731(PART I) 1986 (NON FLAMMABILITY). The terminal block shall be fixed byproviding in side screw from inside of the meter.

(iii) LENGTH AND MATERIALS OF TERMINAL:

The length of terminal in the terminal block shall be adequate to have a proper

grip of the conductor with the help of the screw.

The internal diameter of terminal holes shall be minimum 5.5 mm for metersup to 40 amps. The materials of the terminals shall be tinned brass.

(iv) TYPE OF TERMINALS:

The terminals shall be suitable to carry rated continuous maximum current and

short time overload current & be made of tinned brass. PC ends shallbe provided with lugs.

(v) TERMINAL CHAMBER:

The meter terminal chamber shall be made dust and moisture proof.(vi) TERMINAL SCREWS:

The terminal screws shall not have a thread sizes less than M-4 andhead shall not less than 5 mm dia. The screws shall not have pointed end ofthreads.

(vii) TERMINAL SCREW MATERIALS:

The materials of terminal screws shall be of tinned brass.

(viii) CLEARANCE BETWEEN ADJACENT TERMINALS:

The minimum centre to centre clearance between the adjacent terminalsshall be 13 mm.

5.01.2 METER WITH POLY CARBONATE BASE & COVER

A. MATERIALS OF BASE/COVER/TERMINAL COVER:

The construction of the meter shall be suitable for its purpose in all respects

and shall be given reasonable assurance of continuous performance in all

mechanical, electrical and magnetic adjustments. The construction shall be

such that the meter is not prone to produce audible noise in use. The

meter base shall be of black non transparent polycarbonate. The meter cover &

terminal cover shall be of injection molded in transparent UV stabilized

polycarbonate in natural transparent colour.

As regards the cover the material shall be polycarbonate UV

stabilized transparent grade. The meter cover shall be completely transparent.

The meter shall be compact & reliable in design & shall be immune to vibration &

shock involved in transportation / handling.


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The meter base shall be manufactured from high quality industrial gradematerial viz. Polycarbonate with 10 % glass filled which shall meet followingproperties to ensure higher reliability and long life of the meter case. Meterbase, cover & terminal cover shall conform to the following :-

Sr.No.

TEST 10% Glass filled (Black)for meter base &

terminal block

Transparent for metercover & terminal cover

1 UV ageing for 200 Hrs. asper ASTM : G53(CL No.9.3)

4 Hours UV at 60 C,

ASTM : G53(CL No.9.3) 4 Hourscondensation at 50 C

4 Hours UV at 60 C,

ASTM : G53(CL No.9.3) 4 Hourscondensation at 50 C

2 Boiling water test(10 MIN) No softening &

whitening & No

change in colour,

shape, size &

dimensions

No softening &

whitening & No

change in colour,

shape, size &

dimensions

3 Drop Test from 2

MTRS height- only for

casing i.e. base + cover +

terminal block

+ terminal cover,(Without

inside assembly)

Shall not crack or

Brake

Shall not crack or

brake

4 Glow wire testIS:11000(part 2/SEC-1)1984 OR IEC PUB,60695-2-12

960 oC 850 oC

5 Heat deflectionTemp.(HDT)

HDT/Ae, 1.8MPa edgew

(100mm) As per ISO75/Ae

132 C 125 C

6 Ball pressure test as per

IEC--60695-10-2

125C +/- 2C 125C +/- 2C

7 Flammability Test VO VO


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(a) As per UL 94 or

(b) As per IS11731(Part-2)

1986

FVO FVO

8 Thickness 2.5 mm +/ -0.2 mm 2.5 mm +/ -0.2 mm

The meter manufacturer has to submit test certificate formaterials used from reputed lab/original suppliers lab. for every lot offered forinspection. The thickness of casing, base & terminal cover shall be 2.5 mm +/-0.2mm.

The embossing shall be provided on meter base, meter cover,

terminal cover and terminal block as under UV STABILISED.

MSEDCL and manufacturers logo/ trade name.

B. METER COVER FIXING ARRANGEMENT:

At least two sealing screws of Nickel plated steel shall be provided for properfixing of meter cover. Each sealing screw shall have two independentsealing holes. One hole should be provided in the head and one in the bottomportion, so that two separate seals should be provided. The diameter of thehole shall be 2.0 mm and 1.5mm for the head and bottom portion respectively.The length of the sealing screw shall be long enough to flush with the ground.

C. METER BASE FIXING ARRANGEMENTS:

Single Phase Meter shall have two fixing holes, one at top & other at bottom.

The top screw hole shall be provided on back of the meter so that screw head

is not accessible after the meter is fixed. Lower hole shall be provided inside theterminal compartment so as to make them in accessible to an unauthorizedperson after terminal cover is fixed.

D. SEALING ARRANGEMENT.

The sealing screw used for the meter cover shall be fixed up side down so that

these are tightened from the rear. The sealing screw shall be BRASS or Nickel

plated steel. In addition to the sealing screws provided for the meter

cover, there shall be one or two similar tinned brass or nickel plated

steel sealing screw for the terminal cover.

In case, meter cover and base is of polycarbonate material, the

same shall be ultrasonically welded so that once the meter is manufactured

and tested at factory/works the meter should not be opened at site unless

it is to be broken except the terminal cover. Or in case, if the meter cover

and base is of different materials i.e. where the cover is of polycarbonate

material and base is of bakelite or thermosetting material, in that case the


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meter shall be provided with 2 nos. unidirectional screw. The arrangement of

unidirectional screw shall be such that it should not come out by any

applications, any kind of tools and tackles etc. These unidirectional

screws shall be provided diagonally. Please note that once the

unidirectional screw is fixed and once the meter is manufactured and

tested at factory/works the meter should not be opened at site unless it is to be

broken except the terminal cover. Or alternatively, meter base and cover shall

be locked in such a way that once the cover is fixed into the base, the

same cannot be opened or the base cannot be removed unless it is to

break. Here also it may please be noted that once the meter is manufactured

and tested at factory/works the meter should not be opened at site unless it is

to be broken except terminal cover.

E. INSULATION MATERIALS:

All insulation materials used in the construction of meter shall be substantially

non hygroscopic.

F. PROTECTION OF PARTS:

All parts which are subject to corrosion under normal working conditionshall be effectively protected against corrosion due to atmosphericcondition. The protection coating shall not be liable to damage byordinary handling or injuriously affected by exposure to air under normalcondition of service in actual practice.

G. SCREW INSULATION:

All electrically live screws shall be of heavily tinned brass or nickelplated steel. All other screws shall be electroplated.

H. TERMINAL BLOCK:

Moulded terminal block for current and voltage connections conforming to IS13010/1990(amended up to date) to meet the requirement of terminalconnection arrangement shall be provided. The termination arrangement shallbe provided with an extended transparent terminal cover and shall be sealableindependently to prevent unauthorized tampering. Proper size of groovesshould be provided at bottom of this terminal cover for incoming and outgoing

service leads.I. TYPE OF TERMINALS:

The terminals shall be suitable to carry rated continuous maximum current andshort time overload current & be made of brass. PC ends shall be provided withlugs.

J. TERMINAL CHAMBER:

The meter terminal chamber shall be made dust and moisture proof.


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K. TERMINAL SCREWS:

The terminal screws shall not have a thread sizes less than M-4 and

less than 5 mm dia. The screws shall not have pointed end of threads. The

material of terminal screws shall be of brass.

L. CLEARANCE BETWEEN ADJACENT TERMINALS:

The minimum centre to centre clearance between the adjacent terminals shall

be 13 mm.

5.02 METER FRAME.

The material of the meter frame shall be mono block design of Die castAll Alloy or CRCA steel sheet of minimum thickness 2 mm with holes drilled inone setting.

5.03 The fixing of the meter frame with meter base shall be done by Philipstype (crossed head groove) screws provided with lock and tempered spring

washers. The driving element, bearing and rotor, break magnet system, registercounter shall be mounted on this frame. Fixing of the meter frame shallbe done in such a way that screws are not visible/ accessible from outside.

6.0 CONNECTION DIAGRAM AND TERMINAL MARKINGS.

The connection diagram of the meter shall be clearly shown on inside portionof the terminal cover and shall be of permanent nature. Meter terminals shallalso be marked and this marking should appear in the above diagram. Thediagram & terminal marking on sticker will not be allowed.

7.0 NAME PLATE AND MARKING

Meter shall have a name plate clearly visible, effectively secured againstremoval and indelibly and distinctly marked with all essential particulars asper relevant standards. Meter Serial Number shall be Bar Coded along withnumeric number. The size of bar coded number should not be less than 35x5mm. The manufacturers meter constant shall be marked on the name plate.Meter serial number & bar code on sticker will not be allowed.

In addition to the requirement as per IS following shall be marked on thename plate.

1) Purchase order No & date.

2) Month and Year of manufacture.

3) Name of purchaser i.e. MSEDCL.

4) Guarantee Five Years.

5) ISI mark.


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8.0 INTERNAL CONSTRUCTION OF METER.

8.01 DRIVING ELEMENTS:

I. CURRENT AND POTENTIAL COILS:

The material of the current and pressure coil shall be Electrolytic gradeenabled copper wires. Ingress of moisture shall be prevented. In case ofpressure coils, it shall be done by suitable encapsulation by heat shrinkabletube of suitable grade of synthetic material. The current & pressure coilbobbins shall be of nylon/polypropylene. End connections must be reinforcedfor surge current.

II. The cross section of the conductor used should be such that the maximumcurrent density at maximum continuous current should not exceed 6.2

Amps/Sq.mm & at rated maximum continuous current the maximumtemperature rise should not be more than 55 degree centigrade over theambient temperature.

III. Potential Links:- Only an internal potential link shall be provided in the mainbody of the meter. The internal link shall be such that it is easy to de-link. They

shall not be flimsy & are recommended to be made from 20SWG brass wire &in delinked position; it should not come in contact with any other live parts orthe body of meter.

IV. The potential links shall be so provided that there shall be adequate space toapply screw driver for removing /fixing potential links without removingcomplete body.

V. The resistance wires of the power factor adjustment device shall haveadequate tension to permit smooth and easy adjustment. A clear distance notless than 2 mm shall be maintained between the resistance wire & the frame.The resistance wire should be fitted in a molded trough throughout.

VI. CURRENT COIL/POTENTIAL COIL BOBBINS:

The bobbins for current coil & potential coil shall be in molded form and shall

be made of flame retarding & heat resistance materials & shall not be of paper

boards.

8.02 MAGNET:

8.02.1 Brake Magnet:-

8.02.1.1 Material of the brake magnet: - The material of the brake magnet shall beof ALNICO grade V or Grade VI or grade VII.

8.02.1.2 Number of poles of the brake magnet shall be four. However six polemagnets will be preferred .The magnetic path should be completedwithin the magnet & not through the yoke.

The brake magnet shall be fixed in aluminum casted bracket.


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8.02.2 Electro Magnet: -

8.02.2.1 The electromagnetic core should be liberally designed to avoid error dueto saturation. It should be of cold rolled non-grain oriented silicon steelsheets. The stacking of the care shall preferably be without any rivets.

8.02.2.2 Air gap for magnets: - The air gap of electromagnets and brake magnetshall not be less than 2.2 mm and the air gap shall be uniform. (no

negative tolerance is allowed).8.02.2.3 Clear gap above and below the disc: - the cleat gap above and below

the disc shall not be less than 0.5 mm.

8.03 ROTATING ELEMENTS:

8.03.1 ROTOR:

The Rotor Disc shall be made of high quality / purity aluminum as perIS / IEC and shall be graduated on its upper surface for calibration testby stroboscopic method. The true running and flatness of disc shallbe such that it does not show an axial run out of more than 0.1

mm at the periphery. The rotor disc shall not be anodized / oxidized/varnished. The flatness and eccentricity of rotor shall be ensured by100% inspection before fixing it to meter. The Rotor Spindle shall bemade from special grade Aluminum Alloy /brass or steel. The rotor discshall be die-caste with metal or delrin material to the rotor spindleand it shall not be loose. The aluminum used in disc shall be electrical

grade aluminum with high conductivity as per IS: 5082 Aluminumand Aluminum Alloys for electrical purpose.

8.03.2 SPEED OF ROTOR:

8.03.2.1 The speed of rotor at reference voltage and rated maximumcontinuous current shall not exceed 72 rpm as per IS 13010-2002.

8.03.2.2 Weight of rotor shall be such that meter efficiency factor shall be1.2 (minimum).

Hence weight of rotor shall be such that efficiency factor and torque

shall be achieved as specified above. For the purpose of Efficiency

factor calculation, bare weight of rotor spindle and rotor disc shall be

considered.

8.03.2.3 The torque shall be 4 gm-cm +/-10%, when the meter is underreference condition carrying the rated basic current at unity power

factor.

8.04 BEARING:

8.04.1 BOTTOM BEARING:

The bottom bearing shall of magnetic suspension type with twohomopolar annular magnets with self lubricating sintered graphite guide


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bush. The magnets shall be of ALNICO GRADE VIII/SMCO or ferrite.The rotor spindle shall move in an air cushion caused by repulsionbetween magnets of identical polarity. The SS pin shall be provided torestrict the horizontal displacement of bearing. 100 % verification of thebearing shall be done in house

8.04.2 TOP BEARING:

The top bearing shall be highly polished rust resisting stainless steel pin ofMAXIMUM 0.5 mm dia. Top bearing pin shall be centered properlyand shall have proper strength so that rotor disc can move freely. The capof top bearing shall be of brass. (Nylon cap shall not be allowed.)

8.05 REVERSE RUNNING STOP:

The reverse running stop shall be pawl and cam design provided ondisc OR reverse running stop is to be provided on registered toprevent registering in reverse direction. Due to this provision there shallnot be any effect in running with low load test OR any other arrangementsimilar to above.

8.06 ANTI CREEP DEVICE:

Attraction type or anti creep holes on the rotor disc shall be provided.

8.07 REGISTERING MECHANISM :-

8.07.1.1 The register shall be self aligning type such that once set, the registershall always have correct meshing with the rotor shaft.

8.07.1.2 Energy Register:- The energy register shall only be of cyclometer typeand shall comply with the requirements of the relevant IS. The registershall have five drums and shall be capable of registering upto 99,999units (with out decimal digit register) both for single phase meters andthree phase meters.

8.07.1.3 The digits should be of size 4.5 mm x 2.5 mm and should be snowwhite on black background. No display of partial digit at any position isacceptable.

8.07.1.4 For adjusting the dial for free rotation there should be adequate spaceso that while adjusting the magnet and the disc, the supporting strip ofthe register should not touch the gears thereby causing the locking upof gears.

8.07.2 Material drums:- the material of drums shall be metallic/ Derlin.

8.07.3 Ratio Gear, Worm wheel and Pinions: - All gears shall have regularshape and free from burrs or irregularity to avoid tight gearings. Thematerial of ratio gear, worm wheel and pinions shall be clock brass /leaded brass / Delrin.

8.07.4 Material of counter frame: - The material of counter frame shall be ofbrass sheet of not less than 1 mm thickness to give rigid counter framewhich will not deform or distort during subsequent transportation andhandling.


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8.07.5 The meter shall pass low load run test. The counter shall be set at99999 at 5% basic current and at unity power factor and the countershall run smoothly upto 00000.

8.07.6 Registering mechanisms imported from collaborator will be preferred.

9.0 REFERENCE CONDITIONS FOR INFLUENCE QUANTITIES: -

9.01 Effect of temperature: -

The variation of errors due to change in ambient temperature shall be asspecified in the IS: 13010 / 1990.

9.02 Effect of Voltage Variation:-

The standard reference voltage shall be 250 Volts for single-phase and 433Volts for three phase as specified in IS. However, since the voltageconditions experienced in the field are different and voltage varies from 150to 300 Volts, meters shall withstand these voltage conditions. In order tocheck that the meters withstand these voltage conditions, while conducting

heating test, 1.25 times rated voltage shall be applied.

10.0 TESTS: -

Meters shall pass all the acceptance and routine tests as laid down in IS:13010/1990 and also additional acceptance & routine tests as prescribed inthis specification.

10.01 Type Tests: -

Meter shall be fully type tested including optional type tests as per IS: 13010.

All the Type Tests shall have been carried out from Laboratories which areaccredited by the National Board of Testing and Calibration Laboratories

(NABL) of Govt. of India such as CPRI, Bangalore / Bhopal, ERDAVadodara, ERTL (W) Mumbai, to prove that the meters meet therequirements of the specification. Type Test Reports conducted inmanufacturers own laboratory and certified by testing institute shall not beacceptable. The meters should have been type tested within five years.

Additional acceptance test: -

The following additional tests shall be carried out in addition to theacceptance tests specified in table-10, of IS: 13010/1990.

1) Transportation test as per clause 10.02

2) Low load run test as per clause 8.07.53) Test for material used in dial as per clause 11.18 of IS : 13010.

4) Additional Test as per MSEDCL requirement:

The difference between errors of two consecutive test points from10% Ib to 300% Ib shall not be more than +/-0.5 for the test pointsmentioned below in case of nominal performance curves (load curves).However, the error band at all the test point specified below shall be +/-1%.This test is to be taken on all the samples which are selected for limits of


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error test.

Test points (% Ib)

At Unity PF At 0.5 PF LAG10, 20, 50,100,200,300 20, 50, 100, 200,300

During the lot inspection at factory end, the above additional test will

also be carried out along with the other acceptance test. This being

MSEDCLs special requirement to have precision meter, if meters are notfound meeting with the requirement of this additional test lot shall be

rejected, even though the meters shall have passed in other acceptance

test. In such case fresh lot shall have to be offered for inspection keeping

aside the rejected lot.

10.02 Transportation Test: -

At least 50% of the samples of the meters be tested for error at Imax.,Ib and 5% Ib at unity power factor and 50% Imax and 10% Ib at 0.5 powerfactor besides checking them for starting current and creep test. The meter

should be tested with meters cover duly tightened and after these have beensealed properly. After recording these errors, the meters be put in theirnormal packing i.e. card-board boxes without blocking the rotor disc andtransported for at-least 50 km in any transport vehicle such as pick up van,

jeep etc, on uneven rural roads and then retested at all these loads after thetransportation. The variation in errors recorded before and aftertransportation should not exceed 1% at higher loads and 1.5% at low loads.

NOTE: - Acceptance test shall be carried out on Automatic Computerized

Test Bench with printer and CVCF to avoid any human error. Also the

ERS meter shall be duly calibrated at NABL approved lab having

National/International accreditation & not with master meter.

11.0 CHECK POINTS: -

In addition to the above mentioned tests, the following points shall be checked.

i) Top and bottom bearings.

ii) Cyclometers, registers (for alignment of various parts and smooth operation).

iii) Rotor disc and worm (for trueness and shape).

iv) Condition of main frame and various parts (for damage, rust, etc.).

v) Uniformity of element and magnetic gap.vi) Various connections (e.g. inductive loop) terminations, pressure coil

connection, etc.

vii) Fixing of window glass and gasket.

Check no. ( i ) shall be done under microscope and other checks be done byvisual inspection.


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12.0 ROUTINE TESTS: -

12.01 All routine test as per IS-13010/1990 should be carried out.

12.02 In addition to the above. The following routine tests shall be carried out by themanufacturer.

The energy registration mechanism of the meter shall be tested forsatisfactory work at the point of maximum torque, i.e. when all the drumsare indicating digit (9) the test shall be carried out with 10% of the ratedbasic current. When so tested, the gearing mechanism should beintegrated continuously without any stoppage or slippage.

12.03 The meters offered shall be fully type tested as per IS 13010.In case themeter have already been type tested as per IS 13010, the tenderer shallfurnish type test reports along with the offer. The purchaser reserves the rightto demand repetition of some or all the type tests in presence of purchasersrepresentative at purchasers cost. For this purpose, the tenderer shall quoteunit rates for carrying out each type test. However, such unit rates will not beconsidered for evaluation of the offer. In case the meter offered have not

been type tested earlier as per IS 13010 shall have to be carried out bysuccessful tenderer without any extra cost to the purchaser( ie the MSEDCL)before commencement of the supply of meters and no extra period will beallowed for this purpose.

The supplier can claim exemption from carrying out type tests on metersprovided supplier has carried out the type tests on meters in the past forwhich, the supplier shall submit copy of the test reports to MSEDCLSChief Engineer(Dist).The chief Engineer(Dist) may grant waival fromcarrying out the type tests on the meters if the test certificates areacceptable.

The test reports shall be from recognized laboratories such as NationalPhysical laboratories, National Test House, IDEMI, ERTL, ERDA,University of Roorkee OR College of Engineering Trivendarum, IITs, IIS,Osmania University.

13.0 Packing:-

Each meter should be packed in strong 3 Ply Cardboard Box with suitable packingsupports so that the movement of meters is arrested. The meters should haveplastic paper cover. Each packing should have the required crimping lugs in smallplastic pack stapled to the cover.20 to 25 such single phase meters cases shouldbe again packed in a box having holding hooks of nylon ropes or any otherarrangement be provided. Each such box will contain a small plastic bag with 5 %

extra crimping pins required for the meters packed in the box.

14.0 TENDER SAMPLE:-

Tenderers are required to submit 10 (Ten) nos. of sample meters of eachoffered type / item along with the offer for evaluation. The samples shall beclearly marked with each type / item for which sample is submitted and name


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of bidder. Out of these, two samples should be without Ultrasonic welding toconfirm constructional features.

15.0 PRE-DISPATCH INSPECTION:-

All tests and inspection shall be made at the place of manufacturer unlessotherwise especially agreed upon by the manufacturer and purchaser at the time of

purchases. The manufacturer shall offer to the inspector representing the purchaserall the reasonable facilities ,free of charge for inspection and testing, to satisfy himthat the material is being supplied in accordance with the specification. TheMSEDCLs representative/Engineer attending the above testing will carry outtesting on suitable number of meters as per sampling procedure laid down inIS:13010/1990 and issue test certificate approval to the manufacturer and giveclearance for dispatch.

16.0 INSPECTION AFTER RECIEPT AT STORES:-

(Random Sample Testing)

From each lot ( Lot means the total number of meters received in any of the storeout of inspected & approved lot by EE(IW) under one approval letter) of metersreceived at stores ,sample meter shall be drawn as per Annexure F of IS13010/1990 ( meters received in damage condition shall not be selected assamples) and the RST shall be carried out at Testing Division at Bhandup.

These meters will be tested for acceptance as below:-

Test schedule & sequence of tests shall be as follows:-

1) Insulation Resistance test.

2) Running with no load

3) Staring current test as per MSEDCL Specification.

4) Limits of Errors( as found, without any adjustments to the sample meters).

5) Errors shall be determined as per IS 13010/1990.

6) Transportation tests : as per MSEDCL specifications.

Joint inspection will be carried out in the presence of manufacturersauthorized representative. In the joint inspection if the meters are found not as perspecification, entire lot will stand rejected. For attending joint inspection ,consigneewill give due notice of 5 days to the manufacturer.

Meters shall be tested as above and the lot be accepted if found conforming to ourspecification. However, this does not relive the Supplier of his responsibility toreplace/repair meters found defective during individual meter testing or founddefective in service during guarantee period.

17.0 QUALITY CONTROL:-

The purchaser has a right to send a team of experienced engineers for assessingthe capability of the firm for manufacturing of meters as per this specification. The


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team should be given all assistance and co-operation for inspection and testing atthe bidders works. 10 nos of tender samples should be handed over to the team ofassessing and testing. The tenderer has to give all facilities for carrying out thetesting of these samples.

The team may draw 5 samples from on line production. These 5 samples will betested for acceptance and testing will be done as per the specification to which eachlot is manufactured. The deviation in technical specification of on line production ofmeters from MSEDCL specification should be tabulated .The method adopted tomanufacture the meters as per MSEDCLS specification should be explained to thevisiting team.

18.0 MINIMUM TESTING FACILITIES:-

Manufacturer should posses fully computerized Meter Test Bench System forcarrying out routine and acceptance Tests as per IS 13010/1990 (amended upto date). Test Reports for each and every meter shall be generated. The listof testing equipments shall be enclosed.

The tenderer should have the necessary minimum testing facilities for carrying outthe following tests

1) Insulation resistance measurement.

2) Running with no load.

3) Starting current test as per MSEDCLS specification.

4) Limits of error.

5) Range of adjustment

6) Power loss in voltage coil.

7) Driving torque measurement test.

8) Repeatability of error.

9) Transportation test-As per MSEDCL specification.

10) Low load run test - As per MSEDCL specification.

11) Heating test:-As per IS and with applied voltage of 300 Volts as per MSEDCL,instead of 1.2 times of reference voltage as stated in IS.

12) The manufacturer should have duly calibrated RSS meter of class 0.1 orbetter accuracy. The bidder should have fully automatic Test Benchhaving in-built constant voltage, current and frequency source with facilityto select various loads automatically and print the errors directly.

13) The manufacturer should have Glow Wire Testing facility

19.0 MANUFACTURING FACILITIES:-

19.01 Items manufactured in the factory.


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It is desired that the tenderer should have in house facilities formanufacturing of the following items. In case some of these items are boughtout items the tenderer should give details about the quality control.

1) Current Coil

2) Potential coil

3) Rotor shaft

4) Rotor Disc

5) Register drums gears, worm wheels, pinions etc.

6) Current and potential magnet lamination.

7) Upper bearing housing.

19.02 Bought out items :-

A detailed list of bought out items which are used in the manufacture of themeter should be furnished indicating the names of the firms from whom theseitems are procured. The bidder shall also give the details of quality

assurance procedures followed by him in respect of the bought out items.

20.0 Enclosure of meter:- As per Annexure-I.

21.0 Guarantee of Meters:-

The meter shall be guaranteed for the period of 5 years from the date of

commissioning or 5 and years from the date of dispatch whichever isearlier. The meter found defective within the above guarantee period shall bereplaced/ repaired by the supplier free of cost within one month receipt of

intimation. If the defective meters are not replaced/ repaired with in the abovespecified period, the Company shall recover an equivalent amount plus 15%supervision charges from any of the bills of the supplier.


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SCHEDULES:-

The tenderer shall fill in the following schedules and submit along with the

offer. If the schedules are not submitted duly filled in with the offer, the offer shall berejected.

Schedule `A' ... Guaranteed Technical particulars (As per GTP

parameters uploaded on e- Tendering site.)

Schedule `C' ... Tenderer's Experience.

The discrepancies if any between the specification and the catalogs

and/or literatures submitted as part of the offer by the bidders, the same

shall not be considered and representations in this regard will not be

entertained.

If it is observed that there are deviations in the offer in Guaranteed

Technical Particulars other than those specified in the deviation schedules

then such deviations shall be treated as deviations.


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SCHEDULE - "C"TENDERER'S EXPERIENCE

Tenderer shall furnished here list of similar orders executed /under execution for

supplying single phase electromechanical meters by him to whom a reference may be made

by purchaser in case he considers such a reference necessary.

SR.NO. Name of Order No.& Qty. ordered Qty. supplied

client date

NAME OF FIRM _______________________________________

NAME & SIGNATURE OF TENDERER______________________

DESIGNATION _________________________________________

DATE ________________________________________________


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ANNEXURE-I

MAHARASHTRA STATE ELECTRICITY DISTRIBUTION COMPANY LTD.

TECHNICAL SPECIFICATION FOR SINGLE PHASE POLY-CARBONATE METER BOXSPECIFICATION NO. DIST/MM-IV/006(Dt. 08-05-2007)

1.0 SCOPE :

This specification covers design, manufacturing, testing and supply of fullytransparent poly-carbonate Meter Box suitable for Single phase elctromechanicalEnergy meter. The meter box shall be suitable for wall mounting and indoor oroutdoor application.

2.0 SERVICE CONDITION:The meter box to be supplied against this specification shall be suitable for satisfactorycontinuous operation under the following service conditions.

i. Max. ambient temprature .. 50C

ii. Max. relative humidity 90%iii. Max. annual rainfall. 1450 mmiv. Max. wind pressure. 150Kg./ sq.m.v. Max. altitude above mean sea level 1000 metersvi. Seismic level (Horizontal acceleration) 0.3 gvii. Climatic condition.Moderately hot & humid tropical climate conducive

to rust and fungus growthviii. Ref. Ambient temperature for temperature rise 27C

3.0 APPLICABLE STANDARDS:

Unless otherwise modified in this specification the meter box shall be

generally conform to IS :14772/2000 (amended up to date)

4.0 DESIGN AND CONSTRUCTION:4.01 The meter box shall be so constructed as to have roof tapering down on both side

for easy flow of rain water and box should be totally transparent poly-carbonatematerial natural white colour and having good workmanship.

4.02 The meter box shall be made of anti corrosive, dust proof, weather proof,unbreakable, scratch resistant, water proof, ultra violet, stabilized and flameretardant high grade poly-carbonate material having good dielectric and mechanical

strength. The overall dimension of the meter box shall be suitable to all types ofmeters purchased from various meter manufacturers.

4.03 The box material must be UV stabilized to ensure that the base and cover does notget Yellow over a period of time. The surface appearance of part must be smooth,non porous and homogeneous, free of ripples, defects and marks. No fillers orfibers should be visible at any place.

4.04 a) The meter box shall be made from Poly-carbonate as per IS:14772/2000 and asper requirement of this specification.


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b) The wall thickness of meter box shall be minimum 3 mm on load bearing sideand cover shall be 2 mm.

4.05 The internal dimensions of meter box shall be such that there should be minimum60 mm clearance at the bottom, 40 mm clearance on three sides, 25 mm clearanceon front and 10 mm clearance from back of the meter.

4.06 The meter box should not change in colour, shape, size, dimension when subjectedto 200 hours on UV ageing test. Also it shall be capable of withstanding

temperature of boiling water for five minutes continuously without distortion orsoftening.

4.07 The cover shall be made overlapping type having collars on all four sides. Thecover of the box shall be provided with semi circular/circular gasket ofsufficient size to completely fit in the grooves of the base. The gasket shouldbe made of neoprene rubber or equivalent good quality rubber.

4.08 The cover should be fitted with base by non detachable self locking push fit typearrangement. It should have suitable handle or knob so that if pushed once inside ,the cover shall rest on the base of box in such a way that any access from outsideto the meter is not possible.

4.09 Meter box shall confirm IP-51.4.10 The meter base support inside the box should be raised by about 10mm in the boxfor easy wiring . While fixing the meter , the meter screws should not protrudeoutside.

4.11 Suitable circular holes shall be provided at the bottom of the box for inlet and outletcables with glands of 25 mm size made of brass or poly-carbonate material for thecable securely fixed to the bottom of the box on both side by chucknuts with rubbergrommet. All the screws and washers shall be properly zinc plated.

4.12 For fixing the box to wall or wooden board 4 nos. key holes of min.6 mm diametershall be provided at the four corners of meter box. The meter is to be installed in thebox and the box in assembled condition shall have provision to fix it to pole or a

wall. The 4 nos. screws of size 6 mm diameter and 75 mm long with suitablewashers shall be provided with each meter box.

4.13 The tolerance permissible on the various dimensions of the meter box shall be 3%.

4.14 The surface appearance of part must be smooth, non porous and homogeneous,free of ripples, defects and marks. No fillers or fibers should be visible at any place.

4.15 The meter box should comply with magnetic influences of 0.5 Tesla permanentmagnet.

5.0 TESTS :The meter box should have been successfully type tested as per IS 14772/2000 from

NABL accredited independent testing laboratories such as CPRI/ERDA. The type testreport shall clearly indicate the constructional features of the type tested meter box.The tenderer should also furnish certificate from laboratories where type test carriedout. The requisite test facility available in house for that particular test should beapproved by NABL. The type tests conducted in manufacturers own laboratory andcertified by testing institute shall not be acceptable. The tenderer should also furnishthe particulars giving specific required details of meter box in schedule A attached (Asper Guaranteed Technical Particulars uploaded on e- Tendering site). The offerswithout the details in schedule A and Type Test reports stands rejected.


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6.0 TESTING AND MANUFACTURING FACILITIES:6.1 The manufacturer should have necessary machinery for production of polycarbonate

meter box.6.2 The manufacturer should have in house testing facilities for carrying out following tests

:-Sr. no. Test Details Reference standard

1 Flammability (Vo) UL 94 or IS : 11731 (Pt.II)

2. Heat deflection temp. at ( min.150 C)0.45 SUB MPA Load ISO 75

3. Glow wire test IEC 695 2-1 orIS : 11000( Pt 2/sec.1)

4. Ball pressure test IEC : 3355. Water absorption IS : 147726. Mechanical Strength IS : 147727. Marking, Dimensions and construction IS : 147728. Spirit burner test IS : 4249

7.0 SAMPLES :

One sample of meter box as per the specifications should be submittedalong with offer. The offer would be rejected, if meter box sample is notaccompanied.

8.0 MARKING / EMBOSSING :The following information shall be clearly and indelibly embossed (not printed) on

the cover of the meter box except Sr. No. which may be indelibly printed with inkjetprinting.

i) Purchase order number and date.ii) Year and month of manufacture.iii) Purchaser's name : MSEDCL.iv) Guarantee : 5.5 Years .v) Sign of dangervi) Code name of manufacturervii) Meter box Sr. No.(May be same as that of meter enclosed)

9.0 Inspection :The manufacturer shall give minimum 14 days notice for inspection of material.

10.0Packing :The meter box shall be suitably packed in corrugated boxes in order to avoid

damage during transit or handling.

11.0 GUARANTEE :

The supplier shall have to give 5.5 years guarantee of meter box from date ofsupply to MSEDCL.


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ANNEXURE U-IINDEMNITY BOND

UNDERTAKING TO BE SUBMITTED BY THE PARENT COMPANY SITUATED ABROADIN CASE OF THE PARTICIPANT BIDDER WHO IS AN INDIAN BASED SUBSIDIARY ONGENERAL STAMP OF RUPEES 200/-

The Executive Director (Stores),

Maharashtra State Electricity Distribution Co. Ltd.,Prakashgad, Bandra (E),Mumbai 400 056.

Dear Sir:Sub:- Undertaking against Tender ______________

for procurement of _____________________We, M/s .______________________________________________having registered

office at ______________________________________________ are the Parent

Company of M/s. ____________________________________ who have participated

against your tender No. ____________ for procurement of ___________________.

We have carefully read and have thoroughly understood and agree to the terms and

conditions of the subject tender.

We hereby undertake that in case of placement of order against the subject tender on our

subsidiary company, M/s.________________________________, in the event of we

accept all the responsibilities and liabilities for supply of quality meters as per specification

of the tender and execution of the contract. We further hereby undertake that we shall be

responsible for any liability arising out of the contract placed onM/s._____________________________. and to pay MSEDCL on demand the sum of

rupees as per agreement in the event of any breach of condition of the purchase order,

loss and damage of the material till expiry of guarantee period as stipulated in the order.

Our liability here under shall not be impaired or discharged by extension of time or

variation or alteration made with or without our knowledge or consent by or between the

parties to the said contract. This undertaking shall be valid and binding on us upto and

including the execution and guarantee period of the order and shall not be terminable by

notice or change in the constitution of any of the companies. In case of any dispute arising

out of or in connection with this tender or contract, if concluded, the same shall be subject

to the exclusive jurisdiction of the Court in Mumbai (India).

Yours faithfully,(Authorised Signatory)

FOR _________________

single phase meter electromechanical 240708

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