基于信息融合技术的NUGS综合故障选线方法  

Fault Line Selection Method in NUGS Based on the Information Fusion Technology

作　　者：周志成[1] 何俊佳[2] 徒有锋[2] 尹小根[2] 

机构地区：[1]江苏省电力试验研究院有限公司,南京211102 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《高电压技术》2009年第4期838-843,共6页High Voltage Engineering

基　　金：国家电网公司重点科技项目(SGTGY[2007])~~

摘　　要：为解决小电流接地系统选线装置因受线路参数、运行方式、故障接地阻抗等因素的影响,选线准确率不高和存在选线死区的难题,通过分析各选线方法的特点,利用信息融合技术,根据中性点的不同接地方式融合出一套综合故障选线方法,即中性点不接地系统以无功功率法、零序电流幅值相位法为主和中性点经消弧线圈接地系统以有功功率法、5次谐波相位法、残流增量法为主融合出的综合选线判据。基于PC104工控机,利用综合选线判据,设计了新型小电流接地选线装置,并通过了多次动模试验验证。试验结果表明:单一选线方法存在选线死区,而综合故障选线方法具有灵敏度高、灵活性强、选线准确率高的优点。Because of line parameters, running types, fault grounding impedances and other factors, the veracity of fault line selection（FLS） method is not high enough and may contain some dead areas for FLS device of non-utility grounding system（ NUGS）. To overcome this shortage and enhance the robustness and accuracy of FLS device, by using the information fusion technology, a synthetical FLS method is proposed in this paper based on analyzing the characters of FLS according to the different neutral point grounding mode. That is, in the neutral un-grounding system（NUS）, the criterion is made of the zero sequence inactive power （ZSIP） method, the base-wave virtual value （BV） method and the base-wave phase （BP） method of zero sequence current（ ZSC） can achieve high accuracy; and in the neutral resonant grounding s ystem（NES）, the criterion combines zero sequence active power（ZSAP） method, 5-harmonic phase（ HP） method and remaining current increment（RCI） method can even achieve high accuracy. Based on the PC104 industry control computer, a new FLS device of NUGS is designed according to this new FLS. Many dynamic simulation experiments are carried out and the results show that the single FLS method contains some dead areas and the synthetical FLS method can achieve high sensitivity, adjustability and veracity.

关 键 词：小电流接地系统 故障选线 选线装置 信息融合技术 综合故障选线方法 动模试验 

分 类 号：TM862[电气工程—高电压与绝缘技术]