电测与仪表
電測與儀錶
전측여의표
ELECTRICAL MEASUREMENT & INSTRUMENTATION
2013年
10期
54-58
,共5页
故障测距%反向行波%突变性检测%均值化
故障測距%反嚮行波%突變性檢測%均值化
고장측거%반향행파%돌변성검측%균치화
fault location%reverse traveling wave%mutation detection%average
输电线路行波测距较传统工频测距有明显的优势，通过小波变换可精确定位第一个波头位置。但在复杂线路中，由于波形叠加、交叉透射波等因素的影响，经过小波变换后的第二个反射幅值迅速衰减并小幅震荡，严重影响测量精度。针对第二个波头的衰减，本文提出对变换后的第二个反射波进行均值化处理，达到提高测量精度的效果，并通过MATLAB仿真分析了此方法的正确性和有效性。
輸電線路行波測距較傳統工頻測距有明顯的優勢，通過小波變換可精確定位第一箇波頭位置。但在複雜線路中，由于波形疊加、交扠透射波等因素的影響，經過小波變換後的第二箇反射幅值迅速衰減併小幅震盪，嚴重影響測量精度。針對第二箇波頭的衰減，本文提齣對變換後的第二箇反射波進行均值化處理，達到提高測量精度的效果，併通過MATLAB倣真分析瞭此方法的正確性和有效性。
수전선로행파측거교전통공빈측거유명현적우세，통과소파변환가정학정위제일개파두위치。단재복잡선로중，유우파형첩가、교차투사파등인소적영향，경과소파변환후적제이개반사폭치신속쇠감병소폭진탕，엄중영향측량정도。침대제이개파두적쇠감，본문제출대변환후적제이개반사파진행균치화처리，체도제고측량정도적효과，병통과MATLAB방진분석료차방법적정학성화유효성。
Transmission Line Traveling Wave Ranging obviously has more advantages than the power frequency ranging for the precise positioning of the first wave head through the wavelet transform. However, in a complex circuit, the second reflection amplitude after wavelet transform rapidly decays and has a slight concussion, which seriously affects the measurement accuracy due to factors such as waveform superimposed, cross transmission wave and so on. In allusion to the second wave attenuation, this paper proposes that the second reflected wave will transform the average treatment effect so as to improve the measurement accuracy. Then the correctness and validity of this method are analyzed with MATLAB simulation.
