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超高压线路暂态保护中雷电干扰与短路故障的识别
引用本文:段建东,张保会,郝治国,哈恒旭.超高压线路暂态保护中雷电干扰与短路故障的识别[J].电力系统自动化,2004,28(18):30-35.
作者姓名:段建东  张保会  郝治国  哈恒旭
作者单位:1. 西安交通大学电气工程学院,陕西省,西安市,710049;广西大学电气工程学院,广西壮族自治区,南宁市,530004
2. 西安交通大学电气工程学院,陕西省,西安市,710049
3. 西安交通大学电气工程学院,陕西省,西安市,710049;山东鲁能积成电子股份有限公司,山东省,济南市,250100
基金项目:国家自然科学基金资助项目(50277027),中华电力教育基金会许继奖教金资助项目。~~
摘    要:未导致故障的雷击可能会造成超高压线路暂态保护的误动,对这种雷电干扰的识别是暂态保护实用化必须要解决的一个棘手问题。全面分析了输电线路中雷电干扰和故障情形的模量行波大小与行波波形,发现如下特征:感应雷作用下三相线路中的线模量远小于地模量;重型直击雷的波头部分和截波处都突变剧烈;轻型直击雷的波尾时间显著小于短路行波的持续时间。基于此,提出了轻型直击雷、感应雷与重型直击雷、普通短路故障的识别原理,以及利用小波变换的雷电干扰实用识别算法,大量EMTP仿真表明该识别原理可行、算法可靠,有望解决暂态保护在雷电干扰时的误动问题。

关 键 词:暂态保护  雷电干扰  故障  模量行波  行波波形  小波变换  识别
收稿时间:1/1/1900 12:00:00 AM
修稿时间:1/1/1900 12:00:00 AM

IDENTIFICATION OF LIGHTNING AND FAULT IN EHV TRANSMISSION LINE TRANSIENT-BASED PROTECTION
Duan Jiandong,Zhang Baohui,Hao Zhiguo,Ha Hengxu.IDENTIFICATION OF LIGHTNING AND FAULT IN EHV TRANSMISSION LINE TRANSIENT-BASED PROTECTION[J].Automation of Electric Power Systems,2004,28(18):30-35.
Authors:Duan Jiandong  Zhang Baohui  Hao Zhiguo  Ha Hengxu
Affiliation:Duan Jiandong,Zhang Baohui,Hao Zhiguo1,Ha Hengxu
Abstract:It is vital yet difficult to reliably identify lightning disturbance from a fault in transmission lines. The lightning disturbance includes inductive lightning and mild direct-lightning surges that do not cause any fault, and the state of fault involves general faults and severe direct-lightning surges that will cause short-circuit. This paper first analyzes various lightning waves and fault traveling-waves to find the waveform features and magnitude relation among modulus traveling-waves. The characteristics are as follows: the aerial-mode components are far less than ground-mode component of three-phase lines in the case of inductive lightning; the sudden-change occurs abruptly at both the front and chopped wave in severe direct-lightning waveform; the duration of mild direct-lightning is shorter than that of the fault traveling-wave. Then the paper proposes the principle and the wavelet-transform-based algorithm for identifying inductive lightning, mild/severe direct-lightning and general faults. A number of EMTP simulation tests show that the novel identification method is feasible and reliable.
Keywords:transient-based protection  lightning disturbance  fault  modulus traveling-waves  traveling-wave waveform  wavelet transform  identification
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