小相角故障行波測距方法研究
韓志錕
江蘇省電力設(shè)計(jì)院，江蘇 南京 211102
摘 要：為濾除環(huán)境干擾，提取輸電線路小相角故障時(shí)的微弱行波信號(hào)，實(shí)現(xiàn)準(zhǔn)確故障測距，提出了能量比法。從行波能量角度出發(fā)，選擇合理時(shí)間窗，并利用時(shí)窗滾動(dòng)處理故障行波進(jìn)行能量比計(jì)算，得到信號(hào)波頭時(shí)延以實(shí)現(xiàn)故障測距。仿真結(jié)果表明，該方法在低信噪比環(huán)境下有較強(qiáng)抗干擾能力，對微弱突變有效信號(hào)也十分敏感，可廣泛應(yīng)用于行波故障測距領(lǐng)域。
關(guān)鍵詞：能量比；小相角故障；行波故障測距；時(shí)間窗；干擾
中圖分類號(hào)：TM711；TM744 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2013)04-0028-05
Research of Traveling Wave Fault Location Method Under Small Phase-Angle
HAN Zhi-kun
Jiangsu Electric Power Design Institute, Nanjing 211102, China
Abstract: In order to filter noises, to collect weak traveling wave signals when small phase-angle failure occurred and to implement accurate fault location, this paper utilized an energy ratio method. From the viewpoint of traveling wave energy, rational time window was chosen to continuously process fault traveling wave to carry out the calculation of energy ratio, thus the time-delay of wave front could be calculated and fault location was implemented. Simulation results show that this method has stronger anti-interference ability in the environment with low S/N ratio, accurately identifying weak variation signals. This method has the practical value for traveling wave fault location.
Key words: energy ratio; small phase-angle fault; travelling wave fault location; time window; noise
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