电工电气
電工電氣
전공전기
ELECTROTECHNICS ELECTRIC
2013年
4期
28-32
,共5页
能量比%小相角故障%行波故障测距%时间窗%干扰
能量比%小相角故障%行波故障測距%時間窗%榦擾
능량비%소상각고장%행파고장측거%시간창%간우
energy ratio%small phase-angle fault%travelling wave fault location%time window%noise
为滤除环境干扰,提取输电线路小相角故障时的微弱行波信号,实现准确故障测距,提出了能量比法.从行波能量角度出发,选择合理时间窗,并利用时窗滚动处理故障行波进行能量比计算,得到信号波头时延以实现故障测距.仿真结果表明,该方法在低信噪比环境下有较强抗干扰能力,对微弱突变有效信号也十分敏感,可广泛应用于行波故障测距领域.
為濾除環境榦擾,提取輸電線路小相角故障時的微弱行波信號,實現準確故障測距,提齣瞭能量比法.從行波能量角度齣髮,選擇閤理時間窗,併利用時窗滾動處理故障行波進行能量比計算,得到信號波頭時延以實現故障測距.倣真結果錶明,該方法在低信譟比環境下有較彊抗榦擾能力,對微弱突變有效信號也十分敏感,可廣汎應用于行波故障測距領域.
위려제배경간우,제취수전선로소상각고장시적미약행파신호,실현준학고장측거,제출료능량비법.종행파능량각도출발,선택합리시간창,병이용시창곤동처리고장행파진행능량비계산,득도신호파두시연이실현고장측거.방진결과표명,해방법재저신조비배경하유교강항간우능력,대미약돌변유효신호야십분민감,가엄범응용우행파고장측거영역.
In order to filter noises, to collect weak traveling wave signals when small phase-angle failure occurred and to implement ac-curate 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 en-vironment with low S/N ratio, accurately identifying weak variation signals. This method has the practical value for traveling wave fault location.
