1) single plase fault earthing
单相故障接地
2) the single-phase breakdown earth phase
单相故障接地相
1.
In the three-phase power supply system in mining wells,the method to detect the single-phase breakdown earth phase in the system of neutral point unconnected to earth is the next to the phase with the highest voltage in the three-phase voltage is the breakdown phase.
在矿井三相供电系统中,中性点不接地系统中单相故障接地相的判断法:三相电压中以指示值最高相为依据,按相序顺序往下推移一相才是故障相。
3) Single-phase earth fault
单相接地故障
1.
Study on line-selection of zero sequence full current for single-phase earth fault in 6～10kV lines;
6～10kV线路单相接地故障零序全电流选线研究
2.
A simulation test circuit with lumped parameters is designed for the research on the characteristic of arc self-extinction caused by single-phase earth fault occurred in 10kV distribution network.
设计了研究10kV配电网单相接地故障电弧自熄特性的集中参数模拟试验回路,针对集中参数模拟回路和分布参数实际系统,对单相接地故障下的恢复电压峰值及其上升速度进行了数值仿真,分析了模拟回路与实际系统的等效性。
3.
The principles of using signal injection method to detect single-phase earth fault of distribution network at present are compared and analyzed.
对目前配网采用信号注入法检测单相接地故障的原理进行比较分析。
4) single-phase grounding fault
单相接地故障
1.
A virtual value method of locating single-phase grounding fault section of 10kV feeders in power distribution system;
配电网10kV线路单相接地故障区段定位的有效值法
2.
A more accurate fault model based on the distributed parameters of non-solidly grounded system is presented to analyze the transient characteristics of single-phase grounding fault and to improve the faulty feeder selection criterion based on transient signals.
提出了一种基于线路分布参数的小电流接地系统的高精度故障模型,用于分析单相接地故障产生的暂态信号特征及进一步完善基于暂态信息的小电流接地故障选线判据。
3.
The self-extinguishing of the arc caused by a single-phase grounding fault depends mainly on the amplitude of the residual current at grounding point.
可自恢复性单相接地故障点的电弧是否能自然熄灭的决定因素是接地故障残流的大小。
5) single-phase-to-ground fault
单相接地故障
1.
Detecting single-phase-to-ground fault feeder in Compensation Networks;
补偿电网单相接地故障选线
2.
Application of fuzzy set theory to single-phase-to-ground fault line detection;
应用模糊理论实现配电网单相接地故障判别
3.
In order to obtain a better application of low resistance grounding system to improve the safety and reliability of distribution network, the author investigated different characteristics of the power distribution network with neutral grounding through small resistors or petersen coil in the event of single-phase-to-ground fault, as well as the difference between the protecting methods.
为了更好地应用小电阻接地方式来提高配电网系统的安全性、可靠性,笔者研究了中性点采用小电阻接地和消弧线圈接地的配电网在发生单相接地故障时的不同特点以及保护方式的差异。
6) single-phase-to-earth fault
单相接地故障
1.
When single-phase-to-earth fault occurs on a neutral non-direct grounded power system,it is nexessary for improving the reliability of power supplying to select the faulted line quickly.
中性点非有效接地配电网发生单相接地故障时,尽快选出故障线路对提高电网的供电可靠性有重要意义。
2.
By analyzing the single-phase-to-earth fault of neutral-ungrounded system,this paper drew the relationship between the zero sequence current and the zero sequence voltage,and then proposed the method of magnitude and phase comparison which was implemented by using the mobile zero sequence CT and wide area phase measurement.
对中性点不接地配电系统发生单相接地故障进行了分析,得出了各支路零序电流与零序电压之间的幅值相位关系,进一步提出了移动式的比幅比相在线故障定位方法。
3.
Many countries, including China, adopt non-effectively grounding (isolated, Pe-tersen coil or high resistance earthed) neutral in medium voltage distribution networks to reduce outages caused by single-phase-to-earth fault (small current earth fault).
国内外中压配电网中性点广泛采用小电流接地(包括不接地、经消弧线圈接地和经高电阻接地)方式，以避免发生单相接地故障(又称为小电流接地故障)时跳闸造成供电中断。
补充资料：电力系统中性点接地变压器接地
电力系统中性点接地变压器接地
earthing transformer for neutral grounding
d旧n]一x .tong之hongx旧gd一onj旧d一b旧nyoq一j旧d-电力系统中性点接地变压器接地(earthingtransformer for neutral grounding)电力系统中利用接地变压器获得中性点与大地连接，也称中性点辅助变压器接地。当系统中的变压器不具备接人电阻器或接地故障消除器的条件(例如变压器三相绕组为△接线或虽为Y接线但容量不符合要求)时，要利用辅助的变压器提供一个用于接地的中性点。这种变压器应具备零序阻抗低、激磁阻抗大、功率损耗小的特性。绕组为曲折(Z)接线的变压器符合要求，如图1(a)所示。它可以带二次侧绕组，也可以只有一次侧绕组。 这种变压器每相由匝数相等的两个串联分绕组组成，每个磁芯上的两个分绕组间以及它们对二次侧绕组的零序互磁为零。很明显，这种变压器的零序电抗XTo只为变压器一次侧绕组的漏电抗Xs，，即XTo-Xs;，而系统中性点与地之间的计算阻抗Z。为Z。一25，+Z。，其中Z。为中性点电阻器或电抗器的阻抗。见图1(b)。2.为激磁阻抗。见图2，YN，d接线的变压器二次侧绕组可以带一定负荷。从过负荷能力考虑已经知道.接YN，d接线的双绕组变压器中性点的接地设备的容t不应超过变压器额定容t的50%.由此可认为，当变压器额定容t按中性点接地设备的容t设计时，允许二次侧绕组带50%额定容t的负荷. 还有一种特殊接线的接地变压器和接地设备的组合，是1918年鲍赫(R.Bauch)发明的，故也称饱鹅变压器，见图3。变压器一次侧中性点直接接地，开口三角形接线的二次侧连接接地设备，这与一次侧中性点接有接地设备是等效的。单相接地时，不对称的电压可分解为对称的正序和零序，磁通也可分解为对应的分量。磁通人m、人。、人.需要极小的激磁电流，并对应于正序电压U.。、U、。、U。。，零序电压UO.对各相是一样的，故三个磁柱中有相同的磁通式，对零序磁通来说，变压器相当一个单相变压器，只不过分裂为3个磁柱和3个绕组，见图3(c)。单相接地时，这种变压器每个分绕组上的电压为少尹z‘一.哟.!|||一下咖l!补丰气l一!{屯犷!{屯享!孟=zl息)一刃川l|拍--l--﹄·图1绕组为曲折(Z)接线的变压器 (a)接线图.(b)零序阻抗图会‘价“相“压，·““”的““是中”点接地“备电流的1/3，即夸。因而变压器的额定功率为3x2‘会‘争即中性点接地设备“率”1.15倍。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条