Detailed introduction of transformer partial discharge induction withstand voltage test system

The transformer partial discharge induction withstand voltage test system consists of a non partial discharge variable frequency power supply, a non partial discharge excitation transformer, a non partial discharge compensation reactor, a non partial discharge voltage divider (including a peak voltage meter), and a partial discharge tester. Non partial discharge variable frequency power supply can be used for AC withstand voltage testing and partial discharge testing of all electrical equipment. Using an excitation transformer to excite a series or parallel resonant circuit, by adjusting the output frequency of the variable frequency power supply, the reactor inductance L and the sample capacitance C in the circuit resonate, and the resonant voltage is the voltage applied to the sample. Or directly output to the primary of the transformer through an intermediate transformer for induction withstand voltage testing.

The non partial discharge variable frequency power supply is the main component of the complete testing system, which is suitable for:

① Induction withstand voltage and partial discharge test of power transformers

② AC withstand voltage and partial discharge test for transformers, etc

③ AC voltage withstand test for power cables

④ AC withstand voltage test for GIS composite electrical appliances

⑤ AC withstand voltage test for capacitive equipment such as circuit breakers, isolating switches, insulators, and bushings

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

⑦ Suitable for power supply for large-scale ground grid testing

1. System features

① The equivalence of the experiment is good. The output of this device is a sine wave with low waveform distortion. The waveform distortion rate is less than 3%, which is different from other types of variable frequency power supply devices (other types of variable frequency power supply devices output square waves, which are shaped into sine waves). So, during the testing process, this device does not need to measure peak values.

② By using fiber optic control, the high and low voltage control circuits are completely isolated.

③ Small size, light weight, flexible handling, very suitable for on-site use.

④ Simple and convenient operation, simple wiring, can improve work efficiency by 50% (compared to the generator set method)

⑤ Safe and reliable, this device integrates multiple 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 type of protection occurs, the device immediately disconnects the test voltage output, cuts off the main circuit power supply, and ensures the safety of the test personnel, test subjects, and 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 instability of the output voltage is less than 1%

2. Main performance indicators

① Rated input voltage: three-phase AC 380V ± 10%, 50Hz

② Rated output power: single-phase 150kW

③ Output frequency range: 20Hz~300Hz, continuously adjustable

④ Rated output voltage: 0-350V, continuously adjustable

⑤ Rated output current: 0-428A, continuously adjustable

⑥ Frequency instability: ≤ 0.05%

⑦ Voltage instability: ≤ 1%

⑧ Nonlinear distortion: ≤ 1%.

⑨ Partial discharge capacity: ≤ 10pC (measured on the high voltage side of the boost converter).

⑩ Working conditions: temperature -10 ℃~+45 ℃, humidity: 10-90% RH, altitude: ≤ 1000 meters

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com