Intelligent partial discharge measurement device

This paper introduces a entirely new intelligent partial discharge measurement device that integrates with a microcomputer, A/D, time series control and the filter amplifier circuit for analog signal. It has four independent parallel A/D channels, the highest sampling frequency is 20 MHz and data store is 512 K. This device can be used for detecting partial discharge in electrical apparatus by means of acoustical and electrical methods. The waveform and parameters of partial discharge impulse can be shown immediately. The real response waveform of any discharge impulse within one cycle can be observed on the screen. It can give Q-V, Q-ψ, N-φ, Q-N relations and spectrum through FFT. It can carry out correlation analysis and determine the discharge type which is compared with the standard wave by searching the wave in the one cycle. It has special significance in judgement of interference and diagnosing types of partial discharge. Besides, all the signals taken and waveforms can be stored on disks for review and further analysis. Discharge faults of two large transformers (240 kVA) were found in field PD measurement by use of this device