Research on the Synthetic Method for the Detection and Location of PD in GIS

Abstract

The synthetic method for detecting and locating PD defects in GIS is developed from two basic means: ultra high frequency (UHF) electromagnetic signal detection and acoustic emission (AE) detection. The basic principles of method, discharge spectrum, zero band tracks and time-domain waveform features are explained. The actual PD detection and location system for GIS equipments is established. It has wide frequency range, high real-time sampling rate and large flash memory. It is suitable for transient burst pulses measurement. The gradual locating method is introduced. It comprises two stages: rough locating and precise locating. Rough locating is derived from traveling-wave principle. Precise locating uses contour map of AE rms value. The gradual locating greatly improves efficiency and accuracy. The applications in substations and power plants show satisfactory effects of this new method.