Measurement of Carbonization Traces Development by Partial Discharge Based on Distributed Voltage Signals

By the method of engraving a groove on the quartz glass plate, this paper artificially limits the development direction of carbonization channel, eliminating the interference of other directions. With the help of the distributed potential measurement system, and through actual measurement and simulation analysis, it is verified that the space charge generated by the discharge is the cause of the distortion of the distributed voltage waveform. Using the increment of waveform distortion measured at different positions, this paper gives a calculation method for calculating the position and the amount of space charge through theoretical formula derivation. Comparing the data which is calculated by this method in the test and the cardboard layered analysis, the correctness of calculation method is verified, and it is also proved that under this model, the position of space charge can largely characterize the length of the carbonization trace.