Applicable to:

Inductive withstand voltage and partial discharge testing of power transformers; AC withstand voltage and partial discharge testing of instrument transformers and other equipment; AC withstand voltage testing of power cables; AC withstand voltage testing of GIS combination electrical equipment; and AC withstand voltage testing of capacitive equipment such as circuit breakers, disconnectors, insulators, and bushings.

Applicable to power frequency withstand voltage testing of large generator sets.

Applicable to power supply testing of large ground grids.

The no-partial discharge inductive withstand voltage resonance test system can be used for AC withstand voltage and partial discharge testing of all electrical equipment. It uses an excitation transformer to excite a series or parallel resonant circuit. By adjusting the output frequency of the variable frequency power supply, the inductance L of the reactor in the circuit and the capacitance C of the test object resonate. The resonant voltage is the voltage applied to the test object. Alternatively, the output can be directly fed to the primary of the transformer through an intermediate transformer for inductive withstand voltage testing.

Main Features

1. Excellent test equivalence. The output of this device is a sinusoidal wave with minimal waveform distortion. The waveform distortion rate is <3%, unlike other types of variable frequency power supplies (which output a square wave that is shaped into a sinusoidal wave). Therefore, this device does not require peak measurement during the test.

2. Fiber optic control completely isolates the high-voltage and low-voltage control circuits.

3. Compact size, light weight, and flexible transportation make it ideal for field use.

4. Simple and easy operation and wiring simplify work efficiency, increasing work efficiency by 50% (compared to generator-based systems). 5. Safe and reliable, this device incorporates multiple protections, including: discharge breakdown protection, overvoltage setting protection, output short-circuit protection, power-on zero position protection, bridge arm amplifier circuit protection, and power curve protection. When any of these protections occur, the device immediately disconnects the test voltage output and cuts off the main circuit power, ensuring the safety of test personnel, test items, and the test system.

6. The signal source in this device is generated by a dedicated chip and controlled by a microcomputer, resulting in a highly stable output frequency of up to 0.01Hz.

7. The variable-frequency output voltage is controlled by a high-speed microcomputer, with an output voltage instability of <1%.

8. Optional manual/automatic voltage boost switching.

9. Automatic tuning.

Technical Parameters

1. Rated Input Voltage: Three-phase AC 380V ±10%, 50Hz

2. Rated Output Power: Single-phase 450kW

3. Output Frequency Range: 20Hz-300Hz, continuously adjustable, 0-350V, continuously adjustable

4. Rated Output Voltage: 0-350V, continuously adjustable

5. Rated Output Current: 0-1286A, continuously adjustable

6. Frequency Instability: <0.05%

7. Voltage Instability: <1.0%

8. nolinear Distortion: <1.0%

9. Partial Discharge: <10pC, measured on the high-voltage side of the step-up transformer

10. Operating Conditions: Temperature: -10°C to +45°C, Humidity: 10-90% RH

11. Cooling Method: Forced air cooling