- 2078 Kartik · 6 marks
Quotation for a power transformer
Short answer
For a 2x12 MW plant, step-up to 132 kV: specify 16 MVA, 11/132 kV, YNd11, ONAN/ONAF, 10% impedance, with hill transport measures. Indicative total cost for two units with spares and erection is about NPR 10,79,15,000 including VAT.
Make a tentative an example type quotation of a "Power Transformer" for power evacuation purpose from switch yard of a general medium size hydropower project situated in hilly region.
A tentative quotation for a power transformer gives the main technical particulars, scope, price and terms so that the developer can budget and compare offers. Assumed project: a medium hydropower plant of 2 × 12 MW in a hilly region (altitude about 1500 m), evacuating at 132 kV. One step-up transformer per unit.
Rating: MVA, so a standard 16 MVA unit is chosen.
Main technical particulars offered
| Item | Offered value |
|---|---|
| Type | 3-phase, oil-immersed, outdoor, two-winding step-up |
| Rating | 16 MVA ONAN / 20 MVA ONAF |
| Voltage ratio | 11 / 132 kV, off-circuit taps ±2 × 2.5% on HV |
| Vector group | YNd11 (HV neutral solidly earthed) |
| Impedance | 10% ± IEC tolerance |
| Frequency | 50 Hz |
| Insulation level (HV) | BIL 650 kVp, power frequency 275 kV (corrected for altitude) |
| Losses (guaranteed) | No-load ≤ 12 kW; load loss ≤ 85 kW at 75 °C |
| Temperature rise | Oil 50 K, winding 55 K (reduced for altitude above 1000 m, IEC 60076-2) |
| Accessories | Buchholz relay, PRV, OTI/WTI, MOG, silica gel breather, HV/LV bushings, bushing CTs, radiators, fans, marshalling box |
| Hill transport | Shipping weight limited to about 30 t; may ship oil-filled or -filled, radiators separate |
| Standard | IEC 60076 |
Price schedule (indicative)
| S.N. | Description | Qty | Unit price (NPR) | Amount (NPR) |
|---|---|---|---|---|
| 1 | 16/20 MVA, 11/132 kV power transformer as above, with first oil filling | 2 | 4,50,00,000 | 9,00,00,000 |
| 2 | Mandatory spares (bushings, gaskets, Buchholz relay) | 1 lot | – | 15,00,000 |
| 3 | Transport to site, supervision of erection and commissioning | 1 lot | – | 40,00,000 |
| Subtotal | 9,55,00,000 | |||
| VAT 13% | 1,24,15,000 | |||
| Grand total | 10,79,15,000 |
Commercial terms
- Delivery: 7–9 months after LC; FOR site; route survey by supplier.
- Tests: routine tests (ratio, vector group, losses, impedance, insulation) witnessed by the owner; type test reports (temperature rise, impulse) submitted.
- Loss capitalisation: bids are compared with the capitalised value of guaranteed losses; a penalty applies for excess losses.
- Warranty: 24 months after commissioning; payment by LC; validity 120 days.
Prices are only indicative for budgeting; actual prices come from competitive bids.
✓ Answer checked by Claude Opus 5.5 (high effort)
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