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中性点非直接接地电网
相关语句
  non-solidly earthed network
     Analysis of Transient Characteristics of Signals Phase Earth Fault in Non-Solidly Earthed Network
     中性点非直接接地电网单相接地故障暂态特征分析
短句来源
  “中性点非直接接地电网”译为未确定词的双语例句
     THE STUDY OF DETECTING EOUI PMENT FOR SINGLE PHASE FAULT
     中性点非直接接地电网中单相接地故障检测装置研究
短句来源
     A New Model Earth-Protector of Neutral Point Earth-Free Main line
     新型中性点非直接接地电网的接地保护
短句来源
     In ungrounded distribution system the single-phase-grounding and the ferro-resonance caused by the PT (Potential Transformer) are of the frequent accidents.
     在中性点非直接接地电网中 ,单相接地及由电压互感器 (PT)引起的谐振过电压均是多发性的事故。
短句来源
  相似匹配句对
     A New Model Earth-Protector of Neutral Point Earth-Free Main line
     新型中性直接接地电网接地保护
短句来源
     Analysis of Ferroresonance in Neutral Point Non-direct Ground System
     浅析中性直接接地系统中的铁磁谐振
短句来源
     Analysis of Transient Characteristics of Signals Phase Earth Fault in Non-Solidly Earthed Network
     中性直接接地电网单相接地故障暂态特征分析
短句来源
     The selection of surge arrester for 10kV inderect neutral-grounding system
     10kV中性直接接地系统避雷器的选择
短句来源
     THE STUDY OF DETECTING EOUI PMENT FOR SINGLE PHASE FAULT
     中性直接接地电网中单相接地故障检测装置研究
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In ungrounded distribution system the single-phase-grounding and the ferro-resonance caused by the PT (Potential Transformer) are of the frequent accidents. In both of the cases above, the shift voltage of neutral point often appears. So one does not differ from the other easily, especially for the fundamental frequency ferro-resonance. It is the primary cause that the present fault-feeder detector and the PT-resonance-eliminator judge wrongly sometimes. To overcome the disadvantage above, a new general criterion,...

In ungrounded distribution system the single-phase-grounding and the ferro-resonance caused by the PT (Potential Transformer) are of the frequent accidents. In both of the cases above, the shift voltage of neutral point often appears. So one does not differ from the other easily, especially for the fundamental frequency ferro-resonance. It is the primary cause that the present fault-feeder detector and the PT-resonance-eliminator judge wrongly sometimes. To overcome the disadvantage above, a new general criterion, which applies to detect both the fault-feeder and the PT resonance, is presented in this paper. This criterion utilizes the character of the zero-sequence current in the both cases. And the novel detector of ground fault and ferro-resonance, which is developed based on it, works efficiently in practice.

中性点非直接接地电网中 ,单相接地及由电压互感器 (PT)引起的谐振过电压均是多发性的事故。且由于二者往往均表现为中性点出现位移电压 ,尤其是基波谐振更不易与单相接地区分。这是造成目前小电流接地选线与PT谐振消谐装置均存在误判的主要原因。为克服以上不足 ,本文利用两种故障时的零序电流特征 ,提出了一种小电流接地选线与PT谐振的综合判据 ,据此开发的选线消谐装置在实际运行中也取得了良好效果。

Because most of failures are single-phase earthing failures in neutral non-direct earthing electric network, this paper sums up the characteristics law between earth potential trace and electromotive force and changeable law of earthing resistance with changes of system parameters based on the analysis and study on single-phase earthing failure. The earthing fault phase can be discriminated on three-phase vectorgram rapidly and accurately by application of the law. In this way, the possible error caused by application...

Because most of failures are single-phase earthing failures in neutral non-direct earthing electric network, this paper sums up the characteristics law between earth potential trace and electromotive force and changeable law of earthing resistance with changes of system parameters based on the analysis and study on single-phase earthing failure. The earthing fault phase can be discriminated on three-phase vectorgram rapidly and accurately by application of the law. In this way, the possible error caused by application of null sequence voltage to discriminate earthing failure can be eliminated, the accuracy of discriminating earthing fault phase can be improved and the necessary conditions are provided to the system for preventing over voltage and eliminating single-phase earthing failure.

中性点非直接接地电网中,绝大部分系统故障是单相接地故障。本文通过对单相接地故障的分析研究,总结出地电位(D)轨迹与系统电动势(E)之间,随系统参数、接地电阻变化的特性规律,利用该规律可在三相矢量图上迅速准确地判断出接地故障相,克服了仅用零序电压方向判断接地故障相可能产生的误差,提高了判断接地故障相的准确性,为系统及时采取防止过电压和消除单相接地故障措施提供了必要条件。

 
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