disconnectors design

7/28/2019 Disconnectors Design

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Description Two-ColumnRotary Disconnectorsfor Outdoor InstallationType SGF

Asea Brown Boveri Limited

Rated Voltage 36 to 300 kVRated Normal Current 1600 to 2500 A


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The continuously growing demand for electric energy Advantages of the A B B Disconnectorsplaces increasingly stringent requirements on theswitchgear installations and their components. In this

connection operating reliability as well as maintenance- Welded AIuminiumStructurefree and economic operation are the most important The current path halves are welded aluminiumpoints. For many years Asea Brown Boveri structures with a minimum of terminal pointsdisconnectors have satisfied all the requirements, an subject to corrosion, i.e. no appreciable change ofenergy supply unit has to fulfil.0urproducts have the contact resistance over many years.proved their quality and reliability often under extreme

climatic conditions. The experience gained as a NOExternal Springs

consequence of their world-wide application is reflectedin the development of new products and improvements Contact fingers without external springs.in the existing products.

Strong Rotary PedestalsApplication guarantee that the deflection remains unchanged

at high static mechanical al loads.Disconnectors serve for metallic isolation of systems

and form, in open position, a visible isolating distance. Ice Breaking CapabilityThey are appropriate for switching small currents orcurrents when, between the terminals, no significant Disconnectors for operation under severe icechange in voltage occurs across the terminals. conditions up to 20 mm ice thickness are available.Two-column rotary disconnectors can be employed inhigh-voltage switchgear installations of many types

used today. Dead Centre Interlocking

for all Operating Mechanisms.

No change of the switching position in case ofFor earthing and short-circuiting disconnected plant extreme external influences such as storm,sections, each disconnector pole can be equipped with vibration, earthquake.one or two earthing switches.They are available for rated voltages from 123 to 300 Little MaintenancekV and for rated currents up to 2500 A. Owing to the selection of the material used and the

encapsulation of the pedestals and rotary heads inRegulations connection with a permanent lubrication the units

are practically maintenance-free.The disconnectors are designed according to the lEC

Publication 129/1984 and 694/1980, to DIN/VDERegulations 0670, Part 2/9.81 and Part 1000/8.84 andmost other national regulations.ANSI specifications canbe met on request.

TestsThe type testson the disconnectors were performedsuccessfully in our own and independent testdepartments in accordance with the latest regulations.During manufacture all components are continuouslysubjected to quality assurance tests to ensureconsistently high product quality.After completion of the disconnector poles, acomprehensive electrical and mechanical routine test iscarried out on the poles and appertaining operating

mechanisms. Thus perfect functioning is guaranteed.

Front Cover

View of a disconnector type SG F 245 n100 + E100 with Earth Switchrated voltage 245 kV, rated normal current1600 A and

peak withstand current 100 kA

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All components are protected against atmosphericinfluences, the steel parts liable to rusting being hotdip galvanized.

Fig.4Rotary head with high-tension terminal for 1600 A (components). The interior of themaintenance-free rotary head is safely protected against atmospheric influences. Current transfer

takes place via tulip-type contact fingers arranged around two copper bolts. Multipurpose centreconnection area for flat-type terminals with 4 bores according to DIN or NEMA or other standards.For rated current 2500 A the centre connection is provided with 8 bore holes, connection area200x100 mm.

Mode of Operation

Disconnector and earthing switch are operatedseparately. The design of the operating mechanism ofthe disconnector and earthing switch is such that adead centre position is passed through shortly beforethe end positions are reached. Thus, automatic openingor closing of the units - e.g. due to external influences(short-circuits, storm, earthquake) -is impossible.

The energy is transmitted from the operatingmechanism of Me disconnector to a rotary pedestal.The diagonal rod connects both rotary pedestals ofeach pole so that simultaneous operation is ensured.During switch operation both current path halves passthrough an angle of rotation of 90 degrees and arelocated parallelly to each other and at right angles tothe base frame with open disconnector.

In the case of the earthing switch, the operating energyis transmitted to the earthing switch shaft. The tubularcontact arm swings upwards when the unit is closed. Inthe end position the contact fingers come to rest againstMe stop with initial tension.

FFig. 5

Built-on earthing switch type TEC at a 245 kV disconnector. The universaldesign permits the earthing switch to be attached at site as required to suit thelocal conditions. It can also be retrofitted without any difficulty.

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Operating Mechanisms Since all mechanical adjustments have already beencarried out in the factory, only mounting of the

All disconnectors can be supplied with manual assemblies, installation of the coupling rods betweenoperating mechanism or motor-operated mechanism, the poles, connection of the high-tension leads as wellas requested by the client. Each three-pole as the electrical connection leading to the operatingdisconnector or earthing switch group only requires one mechanisms is required at site.operating mechanism. The coupling rods between theindividual poles can be continuously adapted. The provision of stud bolts is of essential help since

their nuts serve for compensating rapidly and exactlyThe operating mechanism is fastened laterally at the the inaccurate position of the support insulators causedbase frame. With units installed o n a higher plane, by tensile forces.

mounting of the operating mechanism within reach ispossible, if desired, by using an additional pivot bearing Little Maintenanceand an operating shaft.

Owing to the selection of the material used and the

Pilot Switches encapsulation of the pedestals and rotary heads inconnection with a permanent lubrication the units are

The pilot switches are attached directly to the operating practically maintenance-free. Inspections are mainlymechanism concerned. The mechanical control of the restricted to components exposed to atmosphericpilot switches by means of the operating mechanism is influences. Under normal climatic conditions thedesigned in a way that the control signal is given only inspection intervals are 5 years.after the operating mechanism has reached the deadcentre position and interlocking of the disconnectororearthing switch has occurred.

InterlocksDisconnector and earthing switch can be interlockedwith each other at the client's request so that duringmanual operation it is only possible to operate theearthing switch with the disconnector in the openposition and the disconnector with the earthing switch inthe open position.For disconnectors with motor-operated mechanism andearthing switches with manual operating mechanism, amechanical interlock can also be provided for theearthing switch, whereas, the operating mechanism ofthe disconnector is interlocked electrically. If motoroperated mechanisms are used, electrical interlockingof both operating mechanisms can be provided.

A blocking magnet can be installed as additionalinterlocking facility in the case of the manual operatingmechanism, which, in disconnected condition, makesan actuation of the operating mechanism impossible.Various types of locks can also be used.Easy InstallationThe disconnectors are delivered in assemblies: lowerpart with rotary pedestals and diagonal rod, current pathhalves, support insulators and operating mechanism.

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List of Types and Technical Data 36 kV

Isolator SGF36n** SGF36p**

Additional designation for design with1 built-on earthing switch + E ** + E **2 built-on earthing switches + 2E..** + 2E**

Rated voltage kV 36 36

Rated normal current A 1600 2500

Rated peak withstand current forisolator and earthing switch kA (peak) 100 100

Rated short-time current 1 s forisolator and earthing switch kA (rms) 40 40

Rated 1 min power-frequency

withstand voltage (50 Hz)to earth and between poles kV (rms) 70 70across the isolating distance kV (rms) 80 80

Rated lightning impulse withstandvoltage 1.2/50 sto earth and between poles kV (peak) 170 170across the isolating distance kV (peak) 195 195

Discharge inception voltage kV > 27 > 27

Radio interference voltage at 23 kV V < 500 < 500

3-phase breaking capacityinductive, capacitive A 2 2

Insulator design:minimum failing load N 4000 4000overall height mm 508 508minimum creepage distance mm 900 900

Admissible mechanical terminal load***static and dynamic N 2500 2500

static portion N 500 500

** The type designation is complemented by the data for the rated peak withstand current.*** The values of the mechanical terminal loads are depending on the minimum failing load of the built-in-insulator given in the table. Insulator designs

with higher strength and extended creepage distance are possible.

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List of Types and Technical Data 72.5 kV

Isolator SGF72.5n** SGF72.5p**

Additional designation for design with1 built-on earthing switch + E ** + E **2 built-on earthing switches + 2E..** + 2E**

Rated voltage kV 72.5 72.5

Rated normal current A 1600 2500

Rated peak withstand current forisolator and earthing switch kA (peak) 100 100

Rated short-time current 1 s forisolator and earthing switch kA (rms) 40 40


withstand voltage (50 Hz)to earth and between poles kV (rms) 140 140across the isolating distance kV (rms) 160 160

Rated lightning impulse withstandvoltage 1.2/50 sto earth and between poles kV (peak) 325 325across the isolating distance kV (peak) 375 375

Discharge inception voltage kV > 46 > 46

Radio interference voltage at 46 kV V < 500 < 500

3-phase breaking capacityinductive, capacitive A 2 2

Insulator design:minimum failing load N 4000 4000overall height mm 770 770minimum creepage distance mm 1813 1813

Admissible mechanical terminal load***static and dynamic N 2500 2500static portion N 500 500

** The type designation is complemented by the data for the rated peak withstand current.

*** The values of the mechanical terminal loads are depending on the minimum failing load of the built-in-insulator given in the table. Insulator designswith higher strength and extended creepage distance are possible.

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List of Types and Technical Data123 kV

Isolator SGF123n** SGF123p** SGF123**

Additional designation for design with1 built-on earthing switch + E ** + E ** + E **

2 built-on earthing switches + 2E..** + 2E** + 2E.**

Rated voltage kV 123 123 123

Rated normal current A 1600 2500 2500

Rated peak withstand current forisolator and earthing switch kA (peak) 100 100 125

Rated short-time current 1 s forisolator and earthing switch kA (rms) 40 40 50

Rated 1 min power-frequencywithstand voltage (50 Hz)to earth and between poles kV (rms) 230 230 230across the isolating distance kV (rms) 265 265 265

Rated lightning impulse withstand

voltage 1.2/50 sto earth and between poles kV (peak) 550 550 550across the isolating distance kV (peak) 650 650 650

Discharge inception voltage kV > 80 > 80 > 80

Radio interference voltage at 78 kV V < 500 < 500 < 500

3-phase breaking capacityinductive, capacitive A 2 2 2

Insulator design:minimum failing load N 4000-6000-8000 4000-6000-8000 4000-6000-8000overall height mm 1220 1220 1220minimum creepage distance mm 1970 1970 1970

Admissible mechanical terminal load***static and dynamic N 3000-4500-6000 3000-4500-6000 3000-4500-6000static portion N 1200-1500-1500 1200-1500-1500 1200-1500-1500

** The type designation is complemented by the data for the rated peak withstand current.*** The values of the mechanical terminal loads are depending on the minimum failing load of the built-in-insulator given in the table. Insulator designs

with higher strength and extended creepage distance are possible.

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Isolator SG F 1 45 n** SG F 1 45 p** SG IF 1 45 p**

Additional designation for design with1 built-on earthing switch + E** + E** + E**2 built-on earthing switches + 2E...** + 2E** E**




Rated short-time current l s forisolator and earthing switch kA (rms) 40 40 50


Rated lightning impulse withstand

voltage 1.2/50 sto earth and between poles kV (peak) 650 650 650across the isolating distance kV (peak) 750 750 750


Radio interference voltage at 92 kV V < 500 < 500 < 500

3-phase breaking capacityinductive, capacitive A 2 2 2

Insulator design:minimum failing load N 4000-6000-8000 4000-6000-8000 4000-6000-8000overall height mm 1500 1500 1500minimum creepage distance mm 2300 2300 2300

Admissible mechanical terminal load**'

static and dynamic N 3100-4700-6000 3100-4700-6000 3100-4700-6000static portion N 1200-1500-1500 1200-1500-1500 1200-1500-1500


*** The values of the mechanical terminal loads are depending on the minimum failing load of the built-in-insulatorgiven in the table. Insulator designs with higher strength and extended creepage distance are possible.

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Isolator SGF170n** SGF170p** SGF170p**

Additional designation for design with1 built-on earthing switch + E** + E** + E**2 built-on earthing switches + 2 E** + 2 E** + 2 E**






Rated lightning impulse withstandvoltage 1.2/50 sto earth and between poles kV (peak) 750 750 750across the isolating distance kV (peak) 860 860 860

Discharge inception voltage kV >110 > 110 > 110

Radio interference voltage at 108 kV V


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Isolator SG F 245 n ** S G F 245 p** S G F 245 p**

Additional designation for design with1 built-on earthing switch + E ** + E ** + E**2 built-on earthing switches + 2E** + 2E** + 2E**



Rated peak withstand current forisolator arid earthing switch kA (peak) 100 100 125



withstand voltage (50 Hz)to earth and between poles kV (rms) 460 460 460across the isolating distance kV (rms) 530 530 530

Rated lightning impulse withstandvoltage 1.2/5 0 sto earth and between poles kV (peak) 1050 1050 1050across the isolating distance kV (peak) 1200 1200 1200

Discharge inception voltage kV >160 >160 > 160

Radio interference voltage at 156 kV. V < 500 < 500 < 500

3-phase breaking capacityinductive, capacitive A 1.5 1.5 1.5

Insulator design:minimum failing load N 4000-6000-8000 4000-6000-8000. 4000-6000-8000overall height mm 2300 2300 2300minimum creepage distance m m 4800 4800 4800

Admissible mechanical terminal load`"'static and dynamic N 3400-5100-6000 3400-5100-6000 3400-5100-6000

static portion N 1300-1500-1500 1300-1500-1500 1300-1500-1500


*** The values of the mechanical terminal loads are depending on the minimum failing load of the built-in-insulatorgiven in the table. Insulator designs with higher strength and extended creepage distance are possible.

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Isolator SGF300 n** SGF300p** SGF300p**

Additional designation for design with1 built-on earthing switch + E** + E** + E**2 built-on earthing switches + 2 E** + 2 E** + 2 E**





Rated 1 min power-frequencywithstand voltage (50 Hz)to earth and between poles kV(rms) 380 380 380

across the Isolating distance kV(rms) 435 435 435

Rated lightning impulse withstandvoltage 1.2/50 sto earth and between poles kV (peak) 1050 1050 1050across the isolating distance kV (peak) 1050(+170)' 1050(+170)' 1050(+170)`

Rated switching impulse withstand

voltage 250/2500 sto earth and between poles kV (peak) 850 850 850across the isolating distanceClass A kV (peak) 850 850 850Class B kV (peak) 700(+245)* 700(+245)* 700(+245)*


Radio interference voltage at 230 kV V


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Main Dimensions

Dimension TypeSGF36 SGF72.5 SGF123 SGF145 SGF170 SGF245 SGF300

A Support insulator distance mm 1000 1000 1400 1650 1830 2620 2620B Base frame length mm 1300 1300 1700 1950 2130 2920 2920C Isolator height SGF...n mm 1093 1325 1775 2055 2255 2855 3245

SGFp mm 1143 1375 1825 2105 2305 2905 3295D Support insulator height mm 508 770 1220 1500 1700 2300 2650E Isolator width (open) mm 560 560 760 925 1030 1370 1370F Isolating distance mm 800 800 1200 1450 1630 2420 2300G Length of earthing

switch attachment mm 450 450 450 450 450 450 450

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Mounting Alternatives

Type Installation(without or with earthing switch)

in series in parallelPmin(mm) Pmin(mm)

SGF36 1790 1270SGF72.5 1790 1270SG F123 2700 1970SG F145 3150 2330SG F170 3530 2640SG F 245 4920 3570SG F 300 5350 4000

Asea Brown BoveriLimited

H V Switchgear(Disconnectors)Maneja,Baroda-390 013, India

Tel:0265-2642141,TIx:0175-6212 ABBLIN,Telefax:0265-2638927,2642184,264067

Marketing Offices:Southern Regional Office: Western Regional Office: Northern Regional Office: Eastern Regional Office:

Sona Towers, 71, Miller Road, VaswaniChambers, 15-16 OutubInstitutionalArea, 238-B,A.J.C.Bose Road,Bangalore -560 052 264/265, Dr. A.B.Road, Worli, Guru NanakFoundation Calcutta-700 020.

Tel:080-22256315 Bombay-400 025. Building, New Delhi -110067. Tel :033-22478832TIx:0845-8394 ABBLIN Tel:022-24308231 Tel :011-2665966 TIx:021-5800 ABBCIN

Telefax:080-22254147 TIx:011-71020 ABBIN Tlx:031-263320 ABBDIN Telefax:033-22472427

Telefax:022-24300143 Telefax:011-26851721Cochin Baroda Chandigarh BhilaiTel :0484-2318301 Tel :0265-2336486 Tel :0172-2608160 Tel :0788-2324783

Coim batore Indore Jaipur Bhubaneswar Tel: 422-2212294 Tel: 0731-2442702 Tel : 0141-2382023 Tel :0674-2412778

Hyderabad Jabalpur Lucknow Jamshedpur Tel :040-2224024 Tel :0761-2316469 Tel : 0522-274635 Tel :0657-2426782

Madras Pune Ludhiana RourkelaTel :044-28261167 Tel:0212-2646263

Tel:0161-2452848 Tel: 0661-2690417Neyveli

Tel: 04148-222728Trivandrum

Tel: 04712-441877Visakhapatnam

Tel: 0891-2550183

1HDB

05001-YN

01/2003

disconnectors design

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