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| A RG Color Pattern Detection of Single-Ended Traveling Wave Fault Location on ±800kV UHVDC Transmission Lines |
| Shu Hongchun1, Zhang Min1, Zhang Guangbin2, Sun Shiyun2, Liu Kezhen2 |
| 1. Kunming University of Science and Technology Kunming 650051 China; 2. Harbin Institute of Technology Harbin 150001 China |
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Abstract Different from the AC bus, there is only one transmission line on the DC bus. The principle of the single-ended traveling waves fault location is not affected by other transmission lines. There is not the case that the voltage traveling waves are zero or weak when single-phase grounding faults locate near the zero-cross point or phase-to-phase faults locate near equal point of two phase voltages. The real physics boundary consists of the smoothing reactor and the DC filter on the UHVDC transmission lines. The reflection coefficient of the fault voltage traveling wave is positive and approached to 1 in the boundary. A RG color pattern graph is formed by mapping the bipolar fault voltage traveling waves to R and G color channels. The color catastrophe point of the RG color pattern graph corresponds to the time of the traveling wave arriving at measuring point while the color catastrophe direction corresponds to the polarity of the traveling wave, namely the red catastrophe corresponds to the positive polarity surge and the green catastrophe corresponds to the negative polarity surge. According to the color catastrophe direction of the initial traveling wave being contrary to that of the reflected wave from the fault point and being the same as that of the reflected wave from the remote terminal boundary, it is to be identified whether the fault located within half of the transmission line, and the character of the second traveling wave. The singularity detection of the fault traveling wave was achieved by the image edge detection, thereby single-terminal traveling wave fault location is implemented. The proposed method is simple, intuitive and without adopting wavelet transform. A large amount of simulation results show that the proposed method is reliable and effective.
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Received: 09 August 2010
Published: 04 March 2014
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2010, Vol. 25 
