>400kV Range
LQTT 600kV/300kVA AC Test Transformer System
(Single-Phase, Cylindrical Design, Two Modular Units)
🔑 Core Specifications
| Parameter | Value |
|---|---|
| Rated Capacity | 300 kVA |
| Output Voltage | 600 kV (2×300kV modules) |
| Frequency | 60 Hz |
| HV Current | 0.5 A |
| Input Voltage | 0.6 kV |
| Input Current | 500 A |
| Waveform Distortion | ≤3% |
| Impedance Voltage | ≤18% |
| No-Load Current | ≤10% |
⚡ Performance & Safety
Electrical Protection
HV terminal grounded via 5/5A current transformer (CT) for real-time monitoring
Surge arrester (3kV) on excitation/transfer windings
Overvoltage Capacity:
110% rated voltage (660kV) for 60s (no insulation damage)
125% rated current for 300s (no thermal damage)
Partial Discharge (PD)
<10pC at 100% Uₕ (600kV)
<8pC at 80% Uₕ (480kV)
Thermal Performance
| Operating Mode | Duration | Temperature Rise |
|---|---|---|
| 100% load | 60 min max | - |
| 66% load | Continuous | Winding ≤65K, Oil ≤55K |
🧩 Modular Components
1. Upper Stage Transformer (LQTT 300kV/300kVA)
Rated: 300kVA, 50Hz, 3kV(LV)/300kV(HV)
Currents: 100A (LV), 1A (HV)
PD Level: <5pC @ 300kV, <3pC @ 240kV
Insulation Resistance: >2,500 MΩ (all windings-to-earth)
Oil Dielectric Strength: >60kV/2.5mm
2. Sub Stage Transformer (LQTT 300kV/600kVA)
Capacities: LV 600kVA, HV 300kVA, Transfer 300kVA
Voltages: HV 300kV, Transfer 3kV
PD/Insulation: Matches upper stage specifications
🛡️ Critical Protection & Environmental Data
| Feature | Specification |
|---|---|
| Noise Level | ≤60 dB (measured at 4m) |
| Insulation Tests | 10kV/1min (LV-HV/housing) |
| 5kV/1min (measurement windings) | |
| Transformer Oil | Breakdown >60kV/2.5mm |
| Moisture <10ppm, Dielectric loss <0.5%@90°C | |
| Acetylene-free, Solidifying point <-40°C |
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