Wuhan UHV specializes in the production of series resonance (also known as AC withstand voltage test device). Next, we will share with you the time and voltage standards for the 20-300Hz AC withstand voltage test device.
Series resonance, also known as series resonance test device, is a test device used to test the power frequency withstand voltage of high-voltage electrical equipment such as power cables, high-voltage switchgear, power transformers, and combiners. The series resonance device consists of a 20~300Hz variable frequency power supply, reactors, excitation transformers, compensation capacitors, and capacitor dividers. With the popularity of series resonance devices, today we will talk about the series resonance withstand voltage time and series resonance voltage standards.
Series resonance withstand voltage time
The series resonance withstand voltage time refers to the time that the test sample can withstand after being raised to the test voltage through the series resonance device. The withstand voltage time varies depending on the voltage level. The series resonance withstand voltage time is used to check the operating conditions of the test sample under high voltage and long time.
Series resonant voltage standard
The series resonant voltage standard is implemented according to the standards defined in the preventive testing specifications
It should be noted that the higher the test voltage, the more effective it is in detecting insulation defects, but the greater the possibility of breakdown of the test sample and the more severe the cumulative effect. If you have special requirements for the withstand time and resonant voltage of the test sample, you need to explain in advance.
Common faults during 20~300Hz series resonance test:
When conducting series resonance tests on power cables, one of the following situations may occur: cable insulation may have defects,
Unstable leakage current during voltage rise or hold;
The leakage current rises sharply with the increase of voltage;
The leakage current increases with the extension of AC withstand voltage time.
