基于改进双端测距原理的带变压器线缆混合线路故障定位方法
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摘要
针对架空线-电缆混合输电线路中在连接点处装设有变压器的线路故障测距问题,本文分析了行波经变压器传播时的波形特点,并提出了一种基于改进双端测距原理的故障定位方法。首先,通过HHT消除行波经变压器衰减导致各次行波波头幅值减小而无法准确提取的缺陷,获取行波到达线路两端的时刻并求取两端时间差值Δt;其次,通过将时间差值代入由整定值构造的时间轴,由Δt在时间轴上的位置得到故障点所在区间;最后,由计算公式求得故障距离。仿真结果表明本文中方法正确可行,适用于带变压器线缆混合线路类型,且具有较高的测距精度和可靠性。
In the Overhead line-cable hybrid transmission line, directing against line type of installing transformer at the connection point and solving the fault location problem of this line type, In this paper, the waveform characteristics of traveling wave passing through transformer are analyzed, and a fault location method for hybrid cable with transformer based on improved two terminal ranging principle is proposed. Firstly, the Hilbert-yellow transform is used to eliminate the defect which can not be extracted accurately by the attenuation of the traveling wave through the transformer, which reduces the amplitude of the wave head of each line. The time difference between the two ends of the line reached by the Hilbert-yellow transform is obtained at both ends of the line, and the difference between the two ends is Δt. Secondly, By bringing the time difference into the time axis constructed by the set value, the position of the fault point is obtained by the position of Δt on the time axis. Lastly, the fault distance is calculated by the formula. The simulation results show that the proposed method is correct and feasible. The method proposed in this paper is suitable for the type of hybrid line with transformer and cable, and It has higher ranging accuracy and reliability.
In the Overhead line-cable hybrid transmission line, directing against line type of installing transformer at the connection point and solving the fault location problem of this line type, In this paper, the waveform characteristics of traveling wave passing through transformer are analyzed, and a fault location method for hybrid cable with transformer based on improved two terminal ranging principle is proposed. Firstly, the Hilbert-yellow transform is used to eliminate the defect which can not be extracted accurately by the attenuation of the traveling wave through the transformer, which reduces the amplitude of the wave head of each line. The time difference between the two ends of the line reached by the Hilbert-yellow transform is obtained at both ends of the line, and the difference between the two ends is Δt. Secondly, By bringing the time difference into the time axis constructed by the set value, the position of the fault point is obtained by the position of Δt on the time axis. Lastly, the fault distance is calculated by the formula. The simulation results show that the proposed method is correct and feasible. The method proposed in this paper is suitable for the type of hybrid line with transformer and cable, and It has higher ranging accuracy and reliability.
引文
[1]于玉泽,覃剑,李功新,等.电缆—架空线混合线路故障测距方法综述[J]电网技术,2006,30(17):64-69.
[2]施慎行,董新洲,周双喜.单相接地故障下第2个反向行波识别的新方法[J].电力系统自动化,2006,30(1):41-59.
[3]高效梅,何奔腾,王慧芳,等.行波距离故障保护中识别第2个反射波性质的新方法[J]电网技术,2013,37(5):1477-1482.
[4]高艳丰,朱永利,闫红艳,等.基于改进双端法的输电线路行波故障定位[J].电测与仪表,2015,52(1):41-56.
[5]梁睿,孙式想.单端行波故障测距的组合方法研究[J].电网技术,2013,37(3):699-706.
[6]于玉泽.电缆_架空线混合线路故障测距方法综述[J].电网技术,2006,30(17):64-69.
[7]郭宁明,杨飞,谭剑,等.基于遗传算法及信号谱分析的电网故障定位新方法[J].电力系统自动化,2016,40(15):79-85.
[8]马丹丹,王晓茹,等.基于小波模极大值的单端行波故障测距[J].电力系统保护与控制,2009,37(3):44-59.
[9]高艳丰,朱永利,闫红艳,等.一种新型的输电线路双端行波故障定位方法[J].电力系统保护与控制,2016,44(8):8-13.
[10]刘伟,陈皓.基于分布参数模型的混合线路故障测距新算法[J].电力系统保护与控制,2009,37(24):76-80,132.
[11]徐伟宗,唐昆明,基于导数法的故障行波波头识别改进算法[J].电网技术,2010,34(1):198.
[12]尹晓光,宋琳琳,尤志,等.与波速无关的输电线路双端行波故障测距研究[J].电力系统保护与控制,2011,39(1):35-39.
[13]黄震,江泰廷,张维锡,等.基于双端行波原理的高压架空线-电缆混合线路故障定位方法[J].电力系统自动化,2010,34(17):88-91.
[2]施慎行,董新洲,周双喜.单相接地故障下第2个反向行波识别的新方法[J].电力系统自动化,2006,30(1):41-59.
[3]高效梅,何奔腾,王慧芳,等.行波距离故障保护中识别第2个反射波性质的新方法[J]电网技术,2013,37(5):1477-1482.
[4]高艳丰,朱永利,闫红艳,等.基于改进双端法的输电线路行波故障定位[J].电测与仪表,2015,52(1):41-56.
[5]梁睿,孙式想.单端行波故障测距的组合方法研究[J].电网技术,2013,37(3):699-706.
[6]于玉泽.电缆_架空线混合线路故障测距方法综述[J].电网技术,2006,30(17):64-69.
[7]郭宁明,杨飞,谭剑,等.基于遗传算法及信号谱分析的电网故障定位新方法[J].电力系统自动化,2016,40(15):79-85.
[8]马丹丹,王晓茹,等.基于小波模极大值的单端行波故障测距[J].电力系统保护与控制,2009,37(3):44-59.
[9]高艳丰,朱永利,闫红艳,等.一种新型的输电线路双端行波故障定位方法[J].电力系统保护与控制,2016,44(8):8-13.
[10]刘伟,陈皓.基于分布参数模型的混合线路故障测距新算法[J].电力系统保护与控制,2009,37(24):76-80,132.
[11]徐伟宗,唐昆明,基于导数法的故障行波波头识别改进算法[J].电网技术,2010,34(1):198.
[12]尹晓光,宋琳琳,尤志,等.与波速无关的输电线路双端行波故障测距研究[J].电力系统保护与控制,2011,39(1):35-39.
[13]黄震,江泰廷,张维锡,等.基于双端行波原理的高压架空线-电缆混合线路故障定位方法[J].电力系统自动化,2010,34(17):88-91.