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This paper presents a new system designed for locating multiple sources of partial discharge. The system employs a sequential triggering method which can detect many pulses or pulse-train electromagnetic waves emitted from partial discharge in one measurement. We utilize four VHF wideband antennas as electromagnetic sensors and calculate the time delay of arrival between them in order to locate PD sources in 3-D. With this technique, we can locate multiple sources based on the assumption that there is only one electromagnetic pulse contained in the detected time window of 2 μs or each time window indicates a signal from one source. The smoothed coherence transform is applied to improve the time delay estimation and compared with the standard cross correlation. The proposed system also enhances the reliability of the method because many pulses are analyzed. A field experiment was performed to evaluate the proposed system.

Location of Multiple PD Sources on Distribution Lines by Measuring Emitted Pulse-Train Electromagnetic Waves