Capacitive equipment such as transformers, GIS systems, SF6 switches, CT/PT, insulators, bus bars, cables, and bushings are common primary electrical equipment in substations. According to the requirements of the test regulations for the withstand voltage of primary electrical equipment in substations of 220V and below, the corresponding AC/DC current withstand test equipment must not only meet the test conditions of high voltage and small current, but also meet the test conditions of low voltage and high current, and the requirements must be taken into account. Wide range of application, using the principle of series resonance, the main equipment is composed of a variable frequency power supply control box (operating console), an excitation transformer, a reactor, and a capacitor voltage divider. The capacitor voltage divider is connected to the rectifier silicon stack and The micro-ammeter can complete the DC withstand voltage test. Because the system has good filtering characteristics after resonance, the DC voltage it produces is better than the DC voltage initially rectified by an ordinary test transformer. It is the withstand voltage equipment of the prefecture, city, and county high-voltage test departments and power installation, repair and test engineering units.

1. The required power capacity is greatly reduced, and the power required for the test is only 1/Q of the test capacity;

2. Small size and light weight, generally 1/3-1/5 of ordinary test equipment;

3. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the false breakdown of the test product by the harmonic peak;

4. The variable frequency power supply has strong protection function and good stability;

5. With multiple working modes, easy to operate;

6. Use 220V or 380V single-phase power supply, which is convenient for on-site power acquisition;

7. Flexible configuration and strong extension function. The resonant reactor adopts multiple methods and a modular combination, which can be connected in series or in parallel to meet the test requirements of a variety of samples and is more convenient for on-site use.

1. Rated test capacity: 0～5000kVA

2. Resonance voltage: 0～1000kV

3. Frequency adjustment range: 20～300Hz

4. System measurement accuracy: 1.0 level

5. Frequency adjustment resolution: 0.01Hz

6. Instability: ≤0.05%

7. Output waveform: Sine wave

8. Waveform distortion rate: ≤0.5%

9. Noise: ≤60dB

10. Q value of reactor: 30～90

11. Working system: under full power output, continuous working time is 60min

12. Ambient temperature: -10℃～45℃

13. Working humidity: ≤90%　　

14. Altitude: ≤3000m

15. Power input: 380V±10% three-phase or 220V±10% single-phase (below 10kW), 50Hz