Economic or deluxe solution optional Better cost performance IEC Standards Criteria New factory for better price NVTC/ OLTC
REFERENCES
ISO 1461: Hot dip galvanized coatings on fabricated iron and steel articles – Specifications and test methods.
IEC 60076: Power transformers.
IEC 60044: Instrument transformers.
IEC 60296: Specification for unused mineral insulating oil for transformers and switchgear.
IEC 60354: Loading guide for oil – immersed power transformers.
IEC 60214: Tap-changers - Part 1: Performance requirements and test methods, Part 2: Application guide.
IEC 60512: Connectors for electronic equipment.
Performance
| 110kV Two-Winding Power Transformer With NVTC/OLTC | |||||||
Rated Capacity (kVA) | Rated Voltage (kV) | Vector Group | Losses (W) | Impedance Voltage (%) | |||
| HV | Tapping Range | LV | No load | On load | |||
| 6300 | 110 121 | ±2×2.5% | 6.3 6.6 10.5 11 | YNd11 | 8000 | 36900 | 10.5 |
| 8000 | 9600 | 45000 | |||||
| 10000 | 11200 | 53100 | |||||
| 12500 | 13200 | 63000 | |||||
| 16000 | 16000 | 77400 | |||||
| 20000 | 19000 | 93600 | |||||
| 25000 | 22400 | 110700 | |||||
| 31500 | 26700 | 133200 | |||||
| 40000 | 31800 | 156600 | |||||
| 50000 | 37600 | 194400 | |||||
| 63000 | 44600 | 234000 | |||||
| 110kV Three-Winding Power Transformer With NVTC/OLTC | ||||||||
Rated Capacity (kVA) | Rated Voltage (kV) | Vector Group | Losses (W) | Impedance Voltage (%) | ||||
| HV | Tapping Range | LV | No load | On load | Step Up | Step Down | ||
| 6300 | 110 ±2×2.5% 121 ±2×2.5% | 35 38.5 ±2×2.5% | 6.3 6.6 10.5 11 | YNyn0d11 | 9600 | 47700 | HV-MV 17-18 HV-LV 10.5 MV-LV 6.5 | HV-MV 10.5 HV-LV 17-18 MV-LV 6.5 |
| 8000 | 11500 | 56700 | ||||||
| 10000 | 13600 | 66600 | ||||||
| 12500 | 16000 | 78300 | ||||||
| 16000 | 19300 | 95400 | ||||||
| 20000 | 22800 | 112500 | ||||||
| 25000 | 27000 | 133200 | ||||||
| 31500 | 32000 | 157500 | ||||||
| 40000 | 38200 | 189000 | ||||||
| 50000 | 45200 | 225000 | ||||||
| 63000 | 53600 | 270000 | ||||||
INSULATION LEVELS
Nominal system voltage (kV, rms) | Highest system voltage (kV, rms) | Lightning Impulse withstand voltage, dry (kV, peak) | Power frequency withstand voltage, wet (kV, rms) |
33 | 36 | 200 | 95 |
132 | 145 | 650/750 (internal/external) | 275/325 (internal/external) |
AUXILIARY SUPPLIES
Equipment generally rated for the following auxiliary power supplies:
(a) Cooler control circuits: 220V, 240 V, single phase, 50Hz
(b) Tap changer control: 220V, 240 V, single phase, 50Hz
(c) Cooling fan motors: 380V, 415 V, three phase, 50Hz
(d) Tap changer motor: 380V, 415 V, three phase, 50Hz
ROUTINE TEST to IEC 60076 (to be done during acceptance testing at factory)
• Measurement of winding resistance
• Ratio test
• Vector group
• Separate source voltage withstand test
• Induced over-voltage
• Insulation resistance
• Oil leakage test on fully assembled transformer for 12 hours
• Measurement of impedance voltage
• Magnetic balance
• Measurement of no-load loss and current
• Measurement of load loss (at normal & extreme taps)
• Tests on on-load tap-changer
• Tests on on-load tap-changer remote control panel
• Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal voltage (Corrected to 75C)
• Lightning impulse withstand test
Type Tests to IEC 60076 (to be done during acceptance testing at factory)
• Temperature rise test – To be performed on one unit during acceptance testing.
Lightning Impulse Withstand Test is already listed under Routine Tests as per IEC 60076.
Test Facility
Installation
110kV Oil-immersed Power Transformer
