This paper introduces the problem of hidden failures in relay protection of power systems.
介绍了电力系统继电保护中存在的隐形故障问题。
Hidden failures in protection system are great threats to the operation of power grids, while there are almost no on-line diagnostic methods for hidden failures so far.
继电保护系统的隐藏故障对电网的运行威胁很大，而隐藏故障的在线诊断十分困难。
It was found that hidden failures in protection schemes caused the disconnection of power system elements in an incorrect and undesirable manner contributing to the disturbance degradation.
继电保护中隐性故障以不正确的和不期望的方式切除电力系统元件造成电力系统大面积扰动。
The reliability assessment to relay protection system can discover the hidden failures of relay protection device, to avoid the expansion of accident due to the incorrect action of relay protection.
对继电保护系统进行可靠性评估，能及时发现继电保护装置的隐患，避免电网发生故障时因保护装置不正确动作引起事故的扩大。
The basic process and theory of power system cascading failure considering protection system hidden failures were analyzed to decrease bulk blackout failure.
继电保护系统的隐藏故障对电网的运行威胁很大，而隐藏故障的在线诊断十分困难。
Hidden failures of relay protection are the main cause of transmission lines cascading trips.
继电保护隐藏故障是造成输电线路连锁跳闸的主要原因。
Hidden failures can be early found and maintenance cost can be cut through the monitoring of machine status and the use of failure diagnostic technique.
通过对机器状态的监测及故障诊断技术的应用，可以及早地发现事故隐患，减少维修成本。
Hidden failures can be early found and maintenance cost can be cut through the monitoring of machine status and the use of failure diagnostic technique.
通过对机器状态的监测及故障诊断技术的应用，可以及早地发现事故隐患，减少维修成本。
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