英语翻译The steady-state operation of a power system is frequent

英语翻译
The steady-state operation of a power system is frequently disturbed by various faults on electrical equipment.To maintain the proper operation of the power system,an effective,efficient and reliable protection scheme is required.Power system components are designed to operate under normal operating conditions.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.This is necessary because the power system component can never be designed to withstand the worst possible conditions due to the fact that this will make the whole system highly uneconomical.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.The protection scheme includes both the protective relays and switching circuits,i.e.circuit breakers.The protective relay which functions as a brain is a very important component.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 trip coil.The circuit breaker after getting command from the protective relay ,disconnects only the faulted element.This is why the protective relay must be reliable,maintainable and fast in operation.In early days,there used to be electromechanical relay of induction disk-type.However,very soon the disk was replaced by inverted cup,i.e.hollow cylinder and the new relay obtained was known as an induction cup or induction cylinder relay.This relay,which is still in use,possesses several important features such as higher speed,higher torque for a given power input and more uniform torque.

一个电力系统稳态运行是经常感到不安的各种电气设备故障.为了保持电力系统,有效,高效和可靠的保障计划正常运行是必需的.电力系统组件的设计运行在正常运行条件.但是,如果由于任何原因对,说的错,是一有异常,这是必要...