电气工程及其自动化专业英语第七单元课件.ppt

* Chapter 7 Power System Protections New Words power system protection 电力系统保护，电力系统继电保护 abnormality n. 异常，反常，不正常 relay n. 继电器，中继器；v. 中继，转播，用继电器控制 circuit breaker 断路器 trip coil 跳闸线圈，脱扣线圈 electromechanical relay 电磁继电器 New Words static relay 静态继电器，无触点继电器 maloperation n. 误操作，误动作，维护不当 energize v. 激励，激磁，驱动，通以电流 overcurrent relay 过电流继电器 undervoltage relay 低电压继电器，欠压继电器 underfrequency relay 低周继电器，低频继电器 New Words directional relay 方向继电器 thermal relay 热继电器，温度继电器，热敏继电器 phase sequence relay 相序继电器 negative sequence relay 负序继电器 zero sequence relay 零序继电器 differential relay 差动继电器 percentage differential relay 比率差动继电器 distance relay 距离继电器 New Words plane impedance relay 平面阻抗继电器 angle impedance relay 角度阻抗继电器 angle admittance relay 角度导纳继电器 Mho relay 姆欧继电器，电导继电器 offset relay 偏置继电器 restricted relay 制约式继电器 pilot relay 控制继电器，辅助继电器 wire pilot relay 有线控制继电器 New Words carrier channel pilot relay 载波控制继电器 microwave pilot relay 微波控制继电器 transductor relay 饱和电抗型继电器 rectifier bridge relay 整流桥型继电器 electronic relay 电子继电器 Notes [1]. However，if due to any reason，say a fault， there is an abnormality，it is necessary that there should be a device which senses these abnormal conditions and if so，the element or component where such an abnormality has taken place is removed，i.e. deleted from the rest of the system as soon as possible.（长句翻译） 译为：然而，由于任何原因，比如故障，出现异常，有必要用一种设备来检测这种异常，然后，出现异常的元件可以被切除，也就是说尽可能快的将该元件与系统其他部分分开。 Notes [2]. And therefore, if such an abnormality takes place in any element or component of the power system network, it is desirable that the affected element / component is removed from the rest of the system reliably and quickly in order to restore power in the remainingsystem under the normal condition as soon as possible. 译为：如果异常状态发生在电力系统网络的任何元件上，受影响的元件应该可靠快速的从系统中切除，以尽快恢复系统正常部分的供电。 Notes [3]. The protective relay is a sensing device，which senses the fault，determines its location and then send command to the proper circuit breaker by closing its t