Abstract
To separate and locate multi-partial discharge (PD) sources in a substation, the use of spectrum differences of ultra-high frequency signals radiated from various sources as characteristic parameters has been previously reported. However, the separation success rate was poor when signal-to-noise ratio was low, and the localization result was a coordinate on two-dimensional plane. In this paper, a novel method is proposed to improve the separation rate and the localization accuracy. A directional measuring platform is built using two directional antennas. The time delay (TD) of the signals captured by the antennas is calculated, and TD sequences are obtained by rotating the platform at different angles. The sequences are separated with the TD distribution feature, and the directions of the multi-PD sources are calculated. The PD sources are located by directions using the error probability method. To verify the method, a simulated model with three PD sources was established by XFdtd. Simulation results show that the separation rate is increased from 71% to 95% compared with the previous method, and an accurate three-dimensional localization result was obtained. A field test with two PD sources was carried out, and the sources were separated and located accurately by the proposed method.
Highlights
Partial discharge (PD) detection and localization in a substation contribute to the assessment of high-voltage equipment insulation condition efficiently [1]
When PD occurs inside a piece of equipment, the ultra-high frequency (UHF) signal can radiate to the external space through any non-metallic shield regions [2]
The PD may occur in multi-equipment simultaneously, and the UHF signals are always interfered by the field noise [3], which makes it difficult to locate the PD sources
Summary
Partial discharge (PD) detection and localization in a substation contribute to the assessment of high-voltage equipment insulation condition efficiently [1]. The PD may occur in multi-equipment simultaneously, and the UHF signals are always interfered by the field noise [3], which makes it difficult to locate the PD sources. It is necessary to research the separation and localization method of multi-PD sources in the substation site. The locations of multi-PD sources are always different; the time delay (TD) of the two UHF signals received by any two antennas of the antenna array are different. With measurement taken at multiple points, the PD can be located in 3-D by the multi-directions based on the error probability localization method. A simulated model with three PD sources is established using the software package XFdtd, the separation rate and localization are examined at a range of signal-to-noise ratios (SNR), and compared with the previously reported method. The effectiveness of the method is verified by the simulation and field test
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