>400kV Range
Technical Specifications (Standardized)
Model: LQTT 800kV (2×400kV) / 1600kVA
Type: Cylindrical modular single-phase
Frequency: 50Hz
Dimensions: Ø2200×7600mm (Grading ring Ø3080mm) | Weight: 30,000kg
| Parameter | Value | Standard |
|---|---|---|
| Rated Capacity | 1600kVA | IEC 60076-11 |
| Input Voltage | 2×3kV | |
| Output Voltage | 800kV (2×400kV series) | |
| Rated Current | Excitation: 2×266.7A, HV: 2A | |
| Impedance Voltage | ≤15% | IEEE C57.12.90 |
| Voltage Unbalance | ≤±5% (series units) | |
| Overload Capacity | 110% current for 300s | IEC 60076-11 |
| Overvoltage Withstand | 110% U<sub>H</sub> (880kV) for 60s | |
| Partial Discharge (PD) | <2pC @ 800kV (system level) | IEC 60270 Class I |
| Insulation Level | 18kV/1min (LV-earth) | IEC 61180 |
| Noise Level | ≤60 dB(A) @ 4m | ISO 3746 |
| Thermal Limits | Winding ΔT≤65K, Oil ΔT≤55K | IEC 60076-7 |
Breakthrough Technology
1. Ultra-Low PD Insulation System
Triple electrostatic shielding (HV/LV/measurement windings)
1500MΩ inter-winding insulation @ 5kV DC
<2pC PD guarantee at full 800kV output
2. High-Current Design
| Winding | Current Rating | Unique Feature |
|---|---|---|
| HV Output (800kV) | 2A | 4x higher than standard |
| Excitation (3kV) | 2×266.7A | Parallel copper busbars |
| Transfer (Lower) | 266.7A | Forced-oil cooling channels |
3. Structural Integrity
Core: Grain-oriented silicon steel
Tank: 20mm thick steel with pressure relief
Sealing: Viton® gaskets (-40°C to 200°C)
Safety: 3kV MOA surge arresters on all inputs
Modular Components
▶ Upper Stage (HCTT-800kVA/400kV)
Dimensions: Ø2200×3200mm | Weight: 12,600kg
PD Level: <2pC @ 400kV
Key Spec: Impedance ≤5% | Waveform THD ≤3%
▶ Lower Stage (HCTT-1600kVA/400kV)
Dimensions: Ø2200×3200mm | Weight: 13,000kg
Transfer Capacity: 800kVA @ 3kV
Unique Feature: Dual excitation inputs (2×3kV)
Dielectric Oil Performance
| Property | Value | Test Standard |
|---|---|---|
| Breakdown Voltage | >60kV/2.5mm | IEC 60156 |
| Moisture Content | <10ppm | ASTM D1533 |
| Dielectric Loss | ≤0.5% @ 90°C | IEC 60247 |
| Acetylene | Undetectable | IEC 60599 |
| Pour Point | ≤-40°C | ASTM D97 |
Operational Profile
| Load Condition | Duration | Thermal Limit |
|---|---|---|
| 100% rated (800kV) | 60 min | Winding ≤65K, Oil ≤55K |
| 80% rated (640kV) | Continuous | Winding ≤65K, Oil ≤55K |
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