Study on Simulator of Ultra-high Frequency Partial Discharge Signal

Because of the available Ultra-high frequency (UHF) PD signal simulator has the problem that the parameters cannot be adjusted, this paper presents a method to generate UHF signals by multichannel signal synthesizing based on magnitude-frequency characteristics and phase-frequency characteristics of PD, from which we have developed a signal device. The principle and system structure of signal device is elaborated, and then measured analysis is given to the performance of device. The result of the experiment analysis shows that the analog signal which contains the time-frequency and phase characteristics of the UHF PD signal. The frequency of the output electromagnetic signal ranges from 0.3GHz to 1.429GHz while the phase distribution characteristic is similar to the power frequency signal. The signal frequency, output power and phi-q, phi-n spectrogram can be adjusted smoothly, the real output is high enough to 25dBm. This simulator build discharge type database by obtain real PD signal, we can also modify and add live data of PD easily. In this way, the signal simulator can generate multiple types of PD UHF signals efficiently.