SPECIFICATION |
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2.4.1 TECHNICAL SPECIFICATION FOR STEP UP |
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POWER TRANSFORMER |
35/40MVA STEP UP TRANSFORMER |
35/40MVA STEP UP TRANSFORMER |
Sl. No. Particulars |
Factory Data |
Factory Data |
1.0 GENERAL |
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1.1 Name of Manufacturer |
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HEMG |
1.2 Description |
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The specification refers to a Three Phase Oil |
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immerged ONAN/ONAF Cooling according to VDE/IEC/DIN/BS Standard. |
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2 Rated KVA |
35000/40000 |
35000/40000 |
3 No Load Voltage Ratio |
6.6/132KV |
6.6/132KV |
4 No. of Phase |
HT -3 , LT - 3 |
HT -3 , LT - 3 |
5 Cooling |
ONAN/ONAF |
ONAN/ONAF |
6 Installation |
Outdoor |
Outdoor |
7 Frequency |
50 Hz |
50 Hz |
8 Winding connection and material |
Star-Delta, Copper |
Star-Delta, Copper |
9 Vector Group |
Ynd1 |
Ynd1 |
10 tap |
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- Range |
+10% to -20% at HV side. |
+15% to -15% at HV side. |
- No. of steps/POS |
24 Steps, 25 Position |
24 Steps, 25 Position |
- Variation per step, % |
1.25% |
1.25% |
11 Temperature rise, Deg. C |
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- Top oil |
50 0C |
50 ºC |
- Winding |
55 0C |
55 ºC |
12 Total loss at rated voltage at principal tapping and rated |
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frequency, kW |
192.22 |
190.22 |
13 Component losses, kW |
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- No load loss at rated voltage at principal |
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tapping and rated frequency, kW |
30 |
28 |
- Load loss at rated current at principal tapping at 75 Deg. C |
160(122 ONAN) |
160(122 ONAN) |
- Auxiliary Loss |
2.22 |
2.22 |
14 Impedance at rated current for principal tapping, % |
11.35% |
11.5% |
15 No load current at rated voltage and frequency, Amps |
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16 Full wave lightning impulse withstand kVp |
650 HV/ 70 LV |
650 HV/ 95 LV |
17 Efficiency at 75 Deg. C at unity power factor, % |
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- At full load |
99.6824 |
99.52% |
- At 75% load |
99.6833 |
99.50% |
- At 50% laod |
99.6852 |
99.45% |
18 Regulation at full load |
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- At unit pf |
4 |
4 |
- At 0.8 lagging pf |
10.01 |
10.01 |
19 Details of tap changer |
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- Make |
Huaming China |
Huaming China |
- Type |
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- Range |
+10% to -20% at HV Side. |
+15% to -15% at HV side. |
20 No. of steps/Position |
24/25 |
24/25 |
a) Rated Voltage, kV |
132 kV |
72.5 kV |
b) Step Voltage, V |
1.25% |
1000-1500V |
21 Terminal arrangement |
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- HV |
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Bushing |
- LV |
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Bushing |
- Neutral |
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Bushing |
22 Approximate masses, Kg |
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- Core & Windings |
29300 |
31600 |
- Tank, fittings & accessories |
19200 |
12000 |
- Oil |
14500 |
12000 |
- Total |
63000 |
55600 |
23 Heaviest package, Kg |
49050(WITH OIL) |
50000(WITH OIL) |
24 Overall dimensions |
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6260*4950*5380mm(L*W*H) |
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25 Auxiliary power voltage |
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AC |
3-phase, 220-240/415-440V, 50Hz |
3-phase, 220-240/415-440V, 50Hz |
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1-phase, 220-240Vac, 50Hz |
1-phase, 220-240Vac, 50Hz |
DC |
110Vdc |
110Vdc |
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FITTINGS & ACCESSORIES: |
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The following fittings and accessories will be |
YES |
YES |
provided along with the main transformers. |
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YES |
YES |
1Rating and diagram plate |
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YES |
YES |
a) Two (2) Nos. safety earthing terminals for |
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transformer tank and radiator banks |
YES |
YES |
b)Lifting lugs |
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YES |
YES |
c)Jacking pads |
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YES |
YES |
d)Skids |
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e)Pulling eyes |
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YES |
YES |
f) Terminal marking plate |
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g) Conservator (main chamber and OLTC chamber) with filling cap. drain |
YES |
YES |
valve, vent pipe and equaliser connection. |
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YES |
YES |
h)RTCC Panel |
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i)Magnetic type oil level indicator with 150mm dia dial and alarm |
YES |
YES |
initiating contacts for low and high oil levels. |
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YES |
YES |
j) Explosion vent with double diaphragm |
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YES |
YES |
k)Inspection cover |
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YES |
YES |
l)Pressure relief device |
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YES |
YES |
- Air release devices |
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- De-hydrating breather complete with 1st fill of activated alumina or |
YES |
YES |
silica gel |
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- 150 mm dial type oil temperature indicator with alarm and trip |
YES |
YES |
contacts and maximum reading pointer. |
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- 150 mm dial type winding temperature indicator with alarm & trip |
YES |
YES |
contacts and maximum reading pointer. |
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- Double float Buchholz relay with alarm and trip contacts, tests, |
YES |
YES |
cocks and window to view the trapped gas. |
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- Oil drain valve at bottom. |
YES |
YES |
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- Oil sampling valves at top, middle and bottom. |
YES |
YES |
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- One (1) shut-off valve each, on either side of Buchholz relay. |
YES |
YES |
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- Sampling gas collectors for Buchholz relay at accessible height. |
YES |
YES |
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- Bank of radiators with isolating valves at top and bottom for |
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connections between the transformer tank and radiator banks. |
YES |
YES |
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- Plain oil level gauge. |
SIZE DESIGN AS PER US |
SIZE DESIGN AS PER US |
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- Bi-directional flanged rollers suitable for 1676 mm gauge. |
2000x1435 |
2000x1435 |
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- Weather proof marshalling box for housing dial type temperature |
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indicators, terminal blocks etc. and complete with toughened glass |
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window, space heater, internal illumination etc. The wiring from |
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various accessories / fittings to marshalling box will be by 1.1 kV |
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grade PVC insulated, sheathed and armoured copper conductor cable of |
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size 2.5 sq.mm. Marshalling box shall be mounted on the transformer |
YES |
YES |
tank and not on radiator banks. |
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- Climbing rungs or ladder. |
YES |
YES |
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X HV neutral bushing |
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TERMINAL BOX SHOW WTI OTI |
TERMINAL BOX SHOW WTI OTI |
- WTI CT terminal box |
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- Earthing terminal with M12 tapped holes |
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x HV and LV cable boxes with bushings |
LT bushing up outline with flange,HT CANCEL |
LT bushing up outline with flange,HT CANCEL |
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- On Load Tap Changer (OLTC) with oil surge relay, RTCC, AVR |
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- Oil filler pipe with cap for transformer conservator and OLTC |
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Chamber (50 mm dia). |
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CT |
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HV CT: 200/1 , 15 VA, 5P 20 |
HV CT: 300/1 , 15 VA, 5P 20 1PC/PHASE |
HV CT: 100/1 , 15 VA, 5P 20 1PC/PHASE |
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HV Neutral CT: 200/1-1. (Two core) 15 VA 5P 20 for REF & SEF |
HV N CT: 300/1 15 VA 5P 20 1PC/PHASE |
HV N CT: 100/1 15 VA 5P 20 1PC/PHASE |
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LV CT : 2400/1, 15 VA, 5P20 |
LV CT : 4000/1, 15 VA, 5P20 1PC/PHASE |
LV CT : 1200/1, 15 VA, 5P20 1PC/PHASE |
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WTI CT: 1837/5 A (Depends on your WTI) |
WTI CT: 300/5 A |
WTI CT: 100/5 A |