电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
Power System Protection and Control
2015年
17期
15-21
,共7页
继发性故障%配电线路%中性点非有效接地%单相接地故障%近似熵
繼髮性故障%配電線路%中性點非有效接地%單相接地故障%近似熵
계발성고장%배전선로%중성점비유효접지%단상접지고장%근사적
cross-country fault%distribution line%neutral non-effective grounded%single phase to ground fault%approximate entropy
为克服中性点非有效接地系统中继发性故障检测困难的问题,提出了一种基于母线电压近似熵的中性点非有效接地配电网继发性故障检测方法。通过对母线三相电压进行近似熵计算,判断是否在计算时间窗内发生继发性故障,并进行继发性故障选相。所提方法仅需要电压信息,既能够识别不同线路同名相的继发性单相接地故障,也能够识别不同线路异名相的间歇性单相接地故障。首次故障与继发性故障之间的检测时间分辨率可达到毫秒级水平,大量基于ATP/EMTP的典型故障仿真结果验证了该判据的正确性。
為剋服中性點非有效接地繫統中繼髮性故障檢測睏難的問題,提齣瞭一種基于母線電壓近似熵的中性點非有效接地配電網繼髮性故障檢測方法。通過對母線三相電壓進行近似熵計算,判斷是否在計算時間窗內髮生繼髮性故障,併進行繼髮性故障選相。所提方法僅需要電壓信息,既能夠識彆不同線路同名相的繼髮性單相接地故障,也能夠識彆不同線路異名相的間歇性單相接地故障。首次故障與繼髮性故障之間的檢測時間分辨率可達到毫秒級水平,大量基于ATP/EMTP的典型故障倣真結果驗證瞭該判據的正確性。
위극복중성점비유효접지계통중계발성고장검측곤난적문제,제출료일충기우모선전압근사적적중성점비유효접지배전망계발성고장검측방법。통과대모선삼상전압진행근사적계산,판단시부재계산시간창내발생계발성고장,병진행계발성고장선상。소제방법부수요전압신식,기능구식별불동선로동명상적계발성단상접지고장,야능구식별불동선로이명상적간헐성단상접지고장。수차고장여계발성고장지간적검측시간분변솔가체도호초급수평,대량기우ATP/EMTP적전형고장방진결과험증료해판거적정학성。
To cope with the detection difficulty of cross-country fault in non-effectively grounded distribution networks, a cross-country fault detection method is proposed, which is based on the approximate entropy of bus voltages.This method calculates the approximate entropy for bus three phase voltages, and detects whether a cross-country fault occurs during the time window.The cross-country faulted phase can also be detected. The proposed method only uses voltage information, which can not only detect the cross-country fault of the same phase with the primary fault, but also can detect the different phase intermittent fault as well.The time resolution of cross-country faults identification is of millisecond level. The correctness of the criterion is proved by ATP/EMTP typical fault simulation results. The proposed algorithm enriches the single line to ground fault detection techniques.