电力系统运行要求安全可靠，但它会发生各种故障和不正常运行状态。各种形式的短路是最常见、危害较大的故障，设计电力系统继电保护的自动装置是必要的，保障电力系统的生产的发展和完善，为社会生活和生产提供基础的电力的保障。%Power system operation is safe and reliable, that fault and abnormal operating conditions. The most fault is of great harm and all forms of short-circuit. So it's necessary to design on Automatic plant of power system relay protection to improve power system that development of production. It could to provide a basis application for the social’s life and production.
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