It is widely known that fault direction can be determined accurately by power directional relay when non-fault phase voltage is introduced to eliminate blind area with 90° connection.
为了减小方向继电器死区,引入非故障相电压来判别故障电流的相位(即90°接线方式)。
Furthermore, the current directional relay can correctly distinguish the direction in which short-circuit fault occurs only by means of measuring the magnitude of current and the phase of voltage.
提出了一种新型微机式方向继电器即电流方向继电器,分析了它的基本工作原理、硬件构成及基本的实现方法,还分析了具体实现过程中可能遇到的问题及其对策。
Giving the equivalent source impedance representation at relaying point, this paper presents a new problem of application of directional relay to series capacitor compensated parallel double-circuit lines, that is.
文中在导出串联电容补偿的平行双回线上各保护安装处的等值电源阻抗表达式的基础上，提出了方向继电器应用于串联电容补偿的平行双回线的一个新问题，即在电容器出口一端区内故障时，故障线路对测方向保护在高阻接地故障时可能判为反向拒动。
directioal earth-leakage relay
对地漏电方向继电器
three-phase power directional relay
三相功率方向继电器
The positive-sequence fault components based directional relay is a new type of unit for recognizing fault direction.
基于正序故障分量的方向继电器是一种新型故障方向判别元件。
It mainly focuses on analysis and determining method of zero sequence power direction relay.
重点介绍零序功率方向继电器的分析及判定方法。
Protection for these isolated systems has been a relatively simple task, which is carried out using over current directional relays with selectivity.
采用具有选择性的过电流方向继电器,对这种相互分隔直流系统的保护相对就简单。
directional comparison microwave relay
方向比较微波继电器
directional comparison carrier relay
方向比较载波继电器
Analysis of Characteristics for Impedance Relay in Sudden Change Variable Grounding Direction
突变量接地方向阻抗继电器性能分析
electronic valve type power directional relay
电子管功率定向继电器
high speed directional overcurrent relay
高速定向过流继电器
Remove relay by lifting straight up.
垂直向上地拆下继电器。
single-phase directional short circuit relay
单相定向短路继电器
voltage drop compensation directional relay
压降补偿式定向继电器
induction type power directional relay
感应式功率定向继电器
induction disc type directional relay
感应圆盘式定向继电器
ectronic valve type power directional relay
电子管功率定向继电器;电子管式功率定向继电器
There is no operative" voltage dead zone", and the definite directionality exists.
同时,继电器不存在动作的“电压死区”,具有明确的方向性。
1-way repeater (includes telephone repeater). One or two line can be specified.
单向中继器（包括电话中继器）。可指定单线或双线。