Bushings
Weldable Bushings
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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)
Capacitor Switch
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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 | ||
| Dimension of OLTC | VIEWCLOSE | ||
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Load Break Switch
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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 |
ABS 66
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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 |
ABS 132
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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 |
OLG T5
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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 |