Transformer Partial Discharge Induction Withstand Voltage Test System

The non-partial discharge variable frequency power supply can be used for AC withstand voltage test and partial discharge test of all electrical equipment. The excitation transformer is used to excite the 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. Or it is directly output to the primary of the transformer through the intermediate transformer for inductive withstand voltage test.

The non-partial discharge variable frequency power supply is the main component of the complete test system. The test system is suitable for:

1. Inductive withstand voltage and partial discharge test of power transformers.

2. AC withstand voltage and partial discharge test of mutual inductors, etc.

3. AC withstand voltage test of power cables.

4. AC withstand voltage test of GIS combined electrical appliances.

5. AC withstand voltage test of capacitive equipment such as circuit breakers, disconnectors, insulators, bushings, etc.

6. Suitable for power frequency withstand voltage test of large generator sets.

7. Suitable for power supply for large ground grid testing.

1. The test has good equivalence. The output of this device is a sine wave with low waveform distortion. The waveform distortion rate is <3%, which is different from other types of variable frequency power supply devices (other types of variable frequency power supply devices are square wave outputs, which are sine waves formed by waveform shaping). Therefore, this device does not need to measure the peak value during the test.

2. It uses optical fiber control to completely isolate the high-voltage and low-voltage control circuits.

3. It is small in size, light in weight, flexible to carry, and very suitable for on-site use.

4. The operation is simple and convenient, the wiring is simple, and it can improve the work efficiency by 50% (relative to the generator set method).

5. It is safe and reliable. This device integrates a variety of protections. Including: discharge breakdown protection, overvoltage setting protection, output short circuit protection, startup zero position protection, bridge arm amplification circuit protection, power curve protection, etc. When any protection occurs, the device immediately disconnects the test voltage output and cuts off the main circuit power supply to ensure the safety of the test personnel, the test product and the test system.

6. The signal source in this device is generated by a dedicated chip and controlled by a microcomputer. The output frequency is highly stable and can reach 0.01Hz.

7. The variable frequency output voltage is controlled by TI's high-speed microcomputer, and the output voltage instability is less than 1%.