>400kV Range
Technical Specifications (Standardized Format)
Model：2×350kV/ 250kVA
Type：Cylindrical, two-module series, single-phase
Frequency：50Hz
| Parameter | Value | Standard |
|---|---|---|
| Rated Capacity | LV: 250kVA, HV: 700kVA | IEC 60076 |
| Rated Voltage | LV: 2×0.6kV, HV: 2×350kV | |
| Rated Current | LV: 2×208.3A, HV: 0.375A | |
| No-Load Current | ≤10% | IEC 60076-1 |
| Waveform Distortion | ≤3% THD | IEEE C57.12.00 |
| Impedance Voltage | ≤15% | |
| Overload Capacity | 125% current for 300s | IEC 60076-11 |
| Overvoltage Withstand | 110% U<sub>H</sub> (770kV) for 60s | |
| Partial Discharge (PD) | <5pC at 100% U<sub>H</sub> | IEC 60270 |
| Insulation Level | 10kV/1min (LV to earth) | IEC 61180 |
| Noise Level | ≤60 dB(A) @ 4m | ISO 3746 |
| Voltage Ratio | Measurement winding: 2000:1 |
Key Technical Highlights
1. Safety Protection System
HV terminal grounded via 5/5A current transformer (real-time monitoring & operator protection)
3kV surge arresters on excitation/transfer windings (IEC 60099-4 compliant)
Dual grounding points on transformer housing
2. Thermal Performance
| Operating Mode | Duration | Temperature Rise Limit |
|---|---|---|
| 100% rated load | 60 minutes | Winding ≤65K, Oil surface ≤55K |
| 80% rated load | Continuous | Winding ≤65K, Oil surface ≤55K |
3. Oil Insulation System
Type 25# mineral oil (GB 2536 compliant)
Breakdown voltage: >60kV/2.5mm
Moisture content: <10ppm
Dielectric loss: ≤0.5% @ 90°C
Acetylene-free / Solidification point: ≤-40°C
Modular Design Components
▶ Upper Stage Transformer (HCTT-125kVA/350kV)
PD Level: <5pC at 350kV
Insulation Resistance: >2500MΩ (HV-LV-earth)
Measurement Winding Ratio: 1000:1
Cooling: ONAN (IEC 60076-2)
▶ Sub-Stage Transformer (HCTT-250kVA/350kV)
Transfer Capacity: 125kVA @ 0.6kV
Impedance Voltage: ≤4.5%
Insulation Withstand: 10kV/1min (LV-HV-housing)
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