Products & Services
Bushings and T&D Accessories
Weldable Bushings
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Features
  • Completely leak proof at 2.5kg/cm2 air pressure
  • Suitable for application at -35°C to +140°C
  • Suitable for helium leak test at 10-6cc/sec at 1Kg/cm2
Specification

Bushings are manufactured upto 25kv, 4000A. These bushing are welded on transformer top plate and connected to transformer lead.
The various rating of bushing is given below.

  • L.V.Bushing – 3.6kv/2500A
  • L.V.Bushing – 3.6kv/4000A
  • H.V.Bushing – 25.0kv/800A
  • H.V.Bushing – 25.0kv/630A(Outdoor Application)
Outline Diagram
Capacitor Switch
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Features
  • Fast acting solenoid mechanism which eliminates pre-strike and re-strike of contacts
  • Mechanical contact position indicator easily visible from side or bottom of the switch
  • Mounting flexibility-it is 360 Degree rotatable
  • 30000 Maintenance free operations
  • Exceeds the requirements of IEC/IEE/ANSI
Application
  • Export to American Market
  • Reactive power compensation at over load
  • It prevents the Voltage surge problems at the receiving end
  • Used at the places where load requirement is high
  • It is suitable for fire hazardous and radioactive environments also
Specification
Maximum voltage rating 12 kV
Maximum current rating 200 A
Creepage Distance 450 mm
Line to ground BIL 95 kV
Open contact 95 kV
Nominal current 10 A
Dry, 1 minute with stand test 36 kV
Wet, 10 seconds with stand test 30 kV
Line to ground insulation level 95 kV
Open contact insulation level 95 kV
Nominal current 10 A
Capacitive Switching Current 200 A
Symmetric Short time Current 4500 A for 1 Second
Asymmetric Short time Current 95000 A for 1 Second
Asymmetric Making Current 9000 A for 1 Second
Outline Diagram
Load Break Switch
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Features
  • With the provision of HRC fuses and Vacuum Interrupter we could achieve selective fault protection according to the fault severity.
  • Ideally suitable up to 1600 kVA
  • Since Arc quenching medium is air, no need to provide additional insulation. Hence it is most Economical
  • Designed to operate up to 10000 operations with minimal Mechanical and Electrical components
  • It is more reliable since no need for additional cooling medium
Specification
Rated Voltage 11 kV
Maximum System Voltage 12 kV
Rated Current 630 A
Rated Short time with stand Current 20 kA
Rated peak with stand Current 50 KA
Rated Short Circuit making Current 50 kA
Rated breaking Current of Load with Power 630 A
Rated close ring breaking Current 630 A
Rated break Cable Charging Current 10 A
Rated idle load Transformer breaking 1600 kVA
Insulation level(rms) 35 kV
Mechanical lifetime(C-O cycle)
a)Vacuum load Switch 10000 Nos
b)Isolator and Earth Switch ≥ 2000 Nos.
Three phase simultaneous closing ≥ 5 ms
Outline Diagram
ABS 66
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Features
  • It can be used up to 66 kV applications
  • Suitable for Delta / Star applications
  • Time per tap change is about 4-6 seconds
  • Transition switching time Is 30 milli seconds
Application
  • Used in distribution transformers up to 35 MVA
  • Commercial industrial Power distribution systems
  • Used in all electricity boards across India
Specification
Maximum voltage rating 72 kV
Maximum current rating 300 A
Direction of power flow Uni-Directional
Tapping arrangement Linear
OLTC design Single Compartment
Maximum number of tap position 23
Maximum operating step voltage 1000 V
Maximum operating voltage Over tapping range 20000 V
Maximum continuous voltage to ground 72000 V
Maximum continuous voltage between phases 720000 V
Peak emergency current 450 A
Weight of tap changer Without oil 620 Kg
Weight of tap changer with oil 1430 Kg
Oil content 980 liters
Impulse voltage between phases 350 kVp(1.2/50 micro seconds)
Impulse voltage between Tap changer to earth 350 kVp(1.2/50 micro seconds)
Impulse voltage between Adjacent contacts 70 kVp(1.2/50 micro seconds)
Impulse voltage across tapping Range 200 kVp(1.2/50 micro seconds
Outline Diagram
ABS 132
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Features
  • Suitable for graded Neutral connected windings
  • Pre-selector is used, in order to make it suitable for coarse-fine/reversal operation
  • Symmetrical resistances and auxiliary switching contacts are giving rise to the Symmetrical flag cycle of transition
  • Transition switching time is 110 to 140 milli seconds
Application
  • Used at the graded neutral end of 132 kV winding
  • Used in distribution transformers up to 31.5 MVA
  • Used in military and aerospace systems
Specification
Maximum voltage rating 132 kV(Graded neutral)
Maximum current rating 300 A
Maximum system voltage 85 kV
OLTC design Single Compartment
Maximum number of tap position 17
Maximum continuous current 300 A
Maximum operating step voltage 1800 V
Maximum operating over fine taps 14000 V
Maximum operating voltage over Coarse taps 14000 V
Maximum continuous voltage to Ground 85000 V
Time per tap change 4 – 6 seconds
Weight of tap changer without oil 650 Kg
Weight of tap changer with oil 1810 Kg
Impulse voltage between Tap changer to earth 350 kVp(1.2/50 micro seconds)
Impulse voltage between adjacent Contacts 200 kVp
Impulse voltage over pre selector 200 kVp
Impulse voltage between Selector and fine selector 250 kVp
Outline Diagram
OLG T5
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Features
  • Selector switch alone used for tap changing operation
  • It meets the requirements of IEEE/ANSI standards
  • It has Vacuum contactors for current commutation
  • Approximate transition time is 2 seconds
  • Center tapped reactor principle is used
  • By pass switches is used to bypass the vacuum interrupter current from all Operating positions
  • Glass windows are provided to enable observation of tap indicator and operation Counter
  • Separate system is provided for verifying correct opening of the bottle before the selector is allowed to move.
  • For each phase two rotary multi position tap selectors with wander point output for tap selection
  • Use of vacuum contactors instead of mechanical contacts ensures adequate switching capacity and long life
Application
  • Export to American market
  • For application in oil filled power transformers for varying transformer ratio onload
  • It is also suitable for Distribution purposes
  • Industries which cannot make frequent maintenance in OLTC due to oil Contamination can use this OLTC
Specification
Maximum voltage rating 33 kV
Maximum current rating 1600 A
Direction of power flow Bi-Directional
Tapping arrangement Linear, coarse-fine, reversible
OLTC design Divertor switch
Maximum Number of tap position 33
Maximum recovery voltage 20 kV (across reversing switch)
Approximate time per tap change 2 seconds
Impulse test voltage to ground and between phases 34 kV/110kVp(for all live parts to)
Impulse voltage with stand 26 kV/70kVp(across tapping range)
Insulation between phase 33 kV
Insulation of all part to ground for continuous voltage 33 kV
Step voltage 1000 V
Power frequency withstand test voltage for all live parts to ground 34 kV
Power frequency with stand test voltage across tapping range 26 kV
Power frequency with stand voltage across one tap 15 kV
Maximum recovery voltage across reversing Switch 20 kV
Weight of OLTC without oil 750 kg
Oil quantity 960 liters