中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2013年
22期
103-112
,共10页
束洪春%田鑫萃%董俊%杨毅
束洪春%田鑫萃%董俊%楊毅
속홍춘%전흠췌%동준%양의
电缆行波色散%特征频带%波速确定%故障测距%TT变换
電纜行波色散%特徵頻帶%波速確定%故障測距%TT變換
전람행파색산%특정빈대%파속학정%고장측거%TT변환
cable line wave dispersion%selected frequency%wave velocity selected%fault location%TT transform
与架空线路相比,电缆线路行波色散更为严重,其行波波速度的确定及故障行波波头到达时刻的精确标定更为关键。将单端行波暂态信号进行小波分解并重构为多个频带的时域信号,采用相关分析计算每一个频带下2个波头的相关系数,选择相关系数最大的频带为特征频带,并利用特征频带的中心频率计算电缆行波波速。在特征频带内利用时域变换的TT算法,对行波波头到达量测端的时刻进行精确标定。由此构建了基于故障特征频带和TT变换的电缆线路单端行波测距方法。大量高压电缆故障测距的电磁暂态仿真结果表明,该方法有效,测距精度高。
與架空線路相比,電纜線路行波色散更為嚴重,其行波波速度的確定及故障行波波頭到達時刻的精確標定更為關鍵。將單耑行波暫態信號進行小波分解併重構為多箇頻帶的時域信號,採用相關分析計算每一箇頻帶下2箇波頭的相關繫數,選擇相關繫數最大的頻帶為特徵頻帶,併利用特徵頻帶的中心頻率計算電纜行波波速。在特徵頻帶內利用時域變換的TT算法,對行波波頭到達量測耑的時刻進行精確標定。由此構建瞭基于故障特徵頻帶和TT變換的電纜線路單耑行波測距方法。大量高壓電纜故障測距的電磁暫態倣真結果錶明,該方法有效,測距精度高。
여가공선로상비,전람선로행파색산경위엄중,기행파파속도적학정급고장행파파두도체시각적정학표정경위관건。장단단행파잠태신호진행소파분해병중구위다개빈대적시역신호,채용상관분석계산매일개빈대하2개파두적상관계수,선택상관계수최대적빈대위특정빈대,병이용특정빈대적중심빈솔계산전람행파파속。재특정빈대내이용시역변환적TT산법,대행파파두도체량측단적시각진행정학표정。유차구건료기우고장특정빈대화TT변환적전람선로단단행파측거방법。대량고압전람고장측거적전자잠태방진결과표명,해방법유효,측거정도고。
Because the traveling-wave dispersion of cable is more serious compared with overhead lines, determining the traveling wave speed and accurate arrival time calibration of fault traveling wave surge is more important for fault location of cable lines. In the paper, a single terminal traveling wave fault location method based on wavelet transform and TT transform was proposed. Fault-generated transient current signals were decomposed by wavelet decomposition transform (WDT) and the decomposition signal was reconstructed into multiple bands of the time-domain signal. In each band, the correlation coefficient of the two wave heads was calculated by the correlation analysis. The largest correlation coefficient of the band was selected as the characteristic band. The center frequency of the characteristic band was used to calculate the traveling wave speed. In the selected frequency bands, the time-time transform (TT algorithm) was used to determine the arrival time of the wave front of fault traveling wave. A large number of electromagnetic transient simulations for high voltage cable fault location indicate that the method is effective and has high accuracy.