问题描述：
英语翻译
Protective relaying is that area of power system design concerned with minimizing service interrupter and limiting damage to equipment when failures occur.The function of protective relaying is to cause the prompt removal of a defective element from a power system.The defective element may have a short circuit or it may be operating in an abnormal manner.Protective relaying systems are design to detect such failures or abnormal conditions quickly and to open a minimum of circuit breakers to isolate the defective element.The effect of quick isolation is threefold:(1)it minimizes or prevents damage to the defective element thus reducing the time and expense of repairs and permitting quicker restoration of the element to service;(2)it minimizes the seriousness and duration of the defective elements affecting on the normal operation of the power system; and (3)it maximizes the power that can be transferred on power systems.The second and third points are of particular significance because they indicate the important role protective relaying plays in assuring maximum service reliability and in system design.The power that can be transmitted across system without the loss of synchronism is the function of fault clearing times.It is apparent that fast fault clearing times permit a higher power transfer than longer clearing times.High-speed clearing of fault can be often provide a means for achieving higher power transfers and thereby defer investment in additional transmission facilities.
Protective relaying is that area of power system design concerned with minimizing service interrupter and limiting damage to equipment when failures occur.The function of protective relaying is to cause the prompt removal of a defective element from a power system.The defective element may have a short circuit or it may be operating in an abnormal manner.Protective relaying systems are design to detect such failures or abnormal conditions quickly and to open a minimum of circuit breakers to isolate the defective element.The effect of quick isolation is threefold:(1)it minimizes or prevents damage to the defective element thus reducing the time and expense of repairs and permitting quicker restoration of the element to service;(2)it minimizes the seriousness and duration of the defective elements affecting on the normal operation of the power system; and (3)it maximizes the power that can be transferred on power systems.The second and third points are of particular significance because they indicate the important role protective relaying plays in assuring maximum service reliability and in system design.The power that can be transmitted across system without the loss of synchronism is the function of fault clearing times.It is apparent that fast fault clearing times permit a higher power transfer than longer clearing times.High-speed clearing of fault can be often provide a means for achieving higher power transfers and thereby defer investment in additional transmission facilities.
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