| SPECIFICATION | | |
| | | |
| 2.4.1 TECHNICAL SPECIFICATION FOR STEP UP | | |
| POWER TRANSFORMER | 35/40MVA STEP UP TRANSFORMER | 35/40MVA STEP UP TRANSFORMER |
| Sl. No. Particulars | Factory Data | Factory Data |
| 1.0 GENERAL | | |
| 1.1 Name of Manufacturer | | HEMG |
| 1.2 Description | | |
| The specification refers to a Three Phase Oil | | |
| immerged ONAN/ONAF Cooling according to VDE/IEC/DIN/BS Standard. | | |
| 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 | | |
| - 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 | | |
| - Top oil | 50 0C | 50 ºC |
| - Winding | 55 0C | 55 ºC |
| 12 Total loss at rated voltage at principal tapping and rated | | |
| frequency, kW | 192.22 | 190.22 |
| 13 Component losses, kW | | |
| - No load loss at rated voltage at principal | | |
| 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 | | |
| 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, % | | |
| - 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 | | |
| - At unit pf | 4 | 4 |
| - At 0.8 lagging pf | 10.01 | 10.01 |
| 19 Details of tap changer | | |
| - Make | Huaming China | Huaming China |
| - Type | | |
| - 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 | | |
| - HV | | Bushing |
| - LV | | Bushing |
| - Neutral | | Bushing |
| 22 Approximate masses, Kg | | |
| - 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 | | 6260*4950*5380mm(L*W*H) |
| | | |
| 25 Auxiliary power voltage | | |
| AC | 3-phase, 220-240/415-440V, 50Hz | 3-phase, 220-240/415-440V, 50Hz |
| | 1-phase, 220-240Vac, 50Hz | 1-phase, 220-240Vac, 50Hz |
| DC | 110Vdc | 110Vdc |
| | | |
| FITTINGS & ACCESSORIES: | | |
| | | |
| The following fittings and accessories will be | YES | YES |
| provided along with the main transformers. | | |
| | YES | YES |
| 1Rating and diagram plate | | |
| | YES | YES |
| a) Two (2) Nos. safety earthing terminals for | | |
| transformer tank and radiator banks | YES | YES |
| b)Lifting lugs | | |
| | YES | YES |
| c)Jacking pads | | |
| | YES | YES |
| d)Skids | | |
| | | |
| e)Pulling eyes | | |
| | YES | YES |
| f) Terminal marking plate | | |
| | | |
| g) Conservator (main chamber and OLTC chamber) with filling cap. drain | YES | YES |
| valve, vent pipe and equaliser connection. | | |
| | YES | YES |
| h)RTCC Panel | | |
| | | |
| i)Magnetic type oil level indicator with 150mm dia dial and alarm | YES | YES |
| initiating contacts for low and high oil levels. | | |
| | YES | YES |
| j) Explosion vent with double diaphragm | | |
| | YES | YES |
| k)Inspection cover | | |
| | YES | YES |
| l)Pressure relief device | | |
| | YES | YES |
| - Air release devices | | |
| | | |
| - De-hydrating breather complete with 1st fill of activated alumina or | YES | YES |
| silica gel | | |
| | | |
| - 150 mm dial type oil temperature indicator with alarm and trip | YES | YES |
| contacts and maximum reading pointer. | | |
| | | |
| - 150 mm dial type winding temperature indicator with alarm & trip | YES | YES |
| contacts and maximum reading pointer. | | |
| | | |
| - Double float Buchholz relay with alarm and trip contacts, tests, | YES | YES |
| cocks and window to view the trapped gas. | | |
| | | |
| - Oil drain valve at bottom. | YES | YES |
| | | |
| - Oil sampling valves at top, middle and bottom. | YES | YES |
| | | |
| - One (1) shut-off valve each, on either side of Buchholz relay. | YES | YES |
| | | |
| - Sampling gas collectors for Buchholz relay at accessible height. | YES | YES |
| | | |
| - Bank of radiators with isolating valves at top and bottom for | | |
| connections between the transformer tank and radiator banks. | YES | YES |
| | | |
| - Plain oil level gauge. | SIZE DESIGN AS PER US | SIZE DESIGN AS PER US |
| | | |
| - Bi-directional flanged rollers suitable for 1676 mm gauge. | 2000x1435 | 2000x1435 |
| | | |
| - Weather proof marshalling box for housing dial type temperature | | |
| indicators, terminal blocks etc. and complete with toughened glass | | |
| window, space heater, internal illumination etc. The wiring from | | |
| various accessories / fittings to marshalling box will be by 1.1 kV | | |
| grade PVC insulated, sheathed and armoured copper conductor cable of | | |
| size 2.5 sq.mm. Marshalling box shall be mounted on the transformer | YES | YES |
| tank and not on radiator banks. | | |
| | | |
| - Climbing rungs or ladder. | YES | YES |
| | | |
| X HV neutral bushing | | |
| | TERMINAL BOX SHOW WTI OTI | TERMINAL BOX SHOW WTI OTI |
| - WTI CT terminal box | | |
| | | |
| - Earthing terminal with M12 tapped holes | | |
| | | |
| x HV and LV cable boxes with bushings | LT bushing up outline with flange,HT CANCEL | LT bushing up outline with flange,HT CANCEL |
| | | |
| - On Load Tap Changer (OLTC) with oil surge relay, RTCC, AVR | | |
| | | |
| - Oil filler pipe with cap for transformer conservator and OLTC | | |
| Chamber (50 mm dia). | | |
| CT | | |
| 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 |
| | | |
| 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 |
| | | |
| 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 |
| | | |
| WTI CT: 1837/5 A (Depends on your WTI) | WTI CT: 300/5 A | WTI CT: 100/5 A |
