电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2012年
4期
91-95
,共5页
方波信号%经消弧线圈接地系统%单相接地%故障选线%配电网
方波信號%經消弧線圈接地繫統%單相接地%故障選線%配電網
방파신호%경소호선권접지계통%단상접지%고장선선%배전망
square-wave signal%power system with arc suppression coil grounding%single-phase grounding fault%fault line selection%distribution networks
提出一种注入方波信号的经消弧线圈接地系统故障选线方法。通过从故障相电压互感器向系统注入一特定频率的方波信号,探测各支路零序电流,并分析其基波与3次谐波电流幅值之间的关系来确定故障线路。详细分析了注入方波信号的单相接地故障选线原理并提出了选线判据。模拟实验结果证明该方法能准确、稳定、快速地实现故障选线,检测精度高且能有效地排除系统对地电容的影响。
提齣一種註入方波信號的經消弧線圈接地繫統故障選線方法。通過從故障相電壓互感器嚮繫統註入一特定頻率的方波信號,探測各支路零序電流,併分析其基波與3次諧波電流幅值之間的關繫來確定故障線路。詳細分析瞭註入方波信號的單相接地故障選線原理併提齣瞭選線判據。模擬實驗結果證明該方法能準確、穩定、快速地實現故障選線,檢測精度高且能有效地排除繫統對地電容的影響。
제출일충주입방파신호적경소호선권접지계통고장선선방법。통과종고장상전압호감기향계통주입일특정빈솔적방파신호,탐측각지로령서전류,병분석기기파여3차해파전류폭치지간적관계래학정고장선로。상세분석료주입방파신호적단상접지고장선선원리병제출료선선판거。모의실험결과증명해방법능준학、은정、쾌속지실현고장선선,검측정도고차능유효지배제계통대지전용적영향。
A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection is proposed.A low frequency square-wave signal is injected from the secondary side of bus voltage transformer,the phase currents flowing through each feeder are detected,and then the relationships of the amplitudes of their fundamental and the third harmonic components are analyzed to select the fault line.The principle of the method is introduced in detail,and the criterion of fault line selection is proposed as well.The analogical test results show that the method has good ability to eliminate the influence of distributed capacitance and the detection accuracy is improved with large grounding resistance.
