Product introduction
The high voltage ac resonant test system is a high-capacity testing apparatus based on the LC resonance principle. By adjusting the output frequency to achieve resonance in the 30-300Hz range (approximating power-frequency conditions), it generates ultra-high test voltages (up to 1200kV) with minimal input power. Specifically engineered for power-frequency equivalent withstand testing and partial discharge detection on large-capacitance equipment including:Gas-Insulated Switchgear (GIS); Power Transformers; Generators; High-Voltage Cables.
Technical Parameters
| Rated output voltage | 0 ~ 220kV(AC effective value) and below |
| output frequency | 30～300Hz |
| Resonance voltage waveform | Pure sine wave, waveform distortion rate≤1.0% |
| Full load working time | Continuous working time of 60min |
| System quality factor | Under maximum load≥20 |
| Frequency adjust fineness | 0.1Hz |
| Instability | ≤0.01% |
| Working power supply | Single-phase 220V or three-phase 380V±10%,Power frequency 50Hz±5% |
System Components and Product parameters
|
Module |
Functional Description |
Key Parameters |
|
Frequency-Tuned Power Supply |
Digital SPWM control for precise frequency regulation |
Power: 50-800kVA |
|
Excitation Transformer |
Isolation and voltage step-up with multi-tap design |
Ratio: 5kV/10kV/20kV → 50kV |
|
Resonant Reactor |
Dry-type/Oil-immersed, tapped inductors |
Single Unit Inductance: 50-250H |
|
Capacitive Divider |
High-voltage measurement and signal feedback |
Accuracy: ±1% |
|
Intelligent Control Console |
7-inch touchscreen with auto-protection |
USB report export |
Core Technical Advantages
|
Feature |
Technical Value |
|
Power-Frequency Equivalence |
Output frequency 45-300Hz (IEC 60060-3 certified), accurately simulating grid operating conditions |
|
Q-Factor Voltage Amplification |
Quality factor Q=30-150 enables 50kV input → 1500kV output (90% reduction in power supply requirements) |
|
Zero-Harmonic Output |
Pure sine wave (THD ≤1%), meets IEC 60270 requirements for partial discharge measurement |
|
Intelligent Tuning |
Automatic resonance scanning (±0.1Hz precision), adapts to ±20% test object capacitance variation |
The device mainly consists of a variable frequency control power supply, an excitation transformer, a reactor, a capacitive voltage divider, and a compensation capacitor (optional).
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