Abstract
Development of High-voltage Testing System Based on Power Frequency Converter Used in Partial Discharge Tests of Potential Transformers
Highlights
The most important high-voltage (HV) test is the verification of the performance of HV equipment in design and construction processes
The difference voltage was less than 1%, the THDv was less than 1%, and the background noise was less than 2 pC
The developed partial discharge (PD) testing system based on the pulse width modulation (PWM) frequency converter was presented
Summary
The most important high-voltage (HV) test is the verification of the performance of HV equipment in design and construction processes Examples of such tests are insulation voltage withstand test, power loss measurement, dielectric loss measurement, and partial discharge (PD) measurement. For the HV test of PTs and to confirm the insulation performance of the test object, it is necessary to raise the voltage to higher than the rating voltage. To avoid the core saturation effect, a test voltage with a frequency higher than twice the power frequency is necessary in the test; the frequency of 200 Hz is a good candidate for all PTs with the rating frequencies of 50 and 60 Hz. Nowadays, power electronics technology has been applied in many practical fields, such as home appliances, automotives and transaction, renewable energy, and HV transmission and distribution systems. The PD testing system composed of a power frequency converter, an additional filter, an HV transformer, and a PD detection system was analyzed, designed, developed, and tested to confirm the validity of the PD test of PTs
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