当电流超过限制值时，过负荷电流继电器自动保护振荡管和整流器，同时可以避免由不当操作所引起的频率漂移。
The over-current relay works to protect oscillation tubes and rectifier, when the current exceeds its limits. Frequency deviation caused by faulty operation is also prevented.
与继电器配合，可对系统和设备进行过电流、过负荷和接地等保护。
Cooperating with relay, it can protect system and equipment from excess current, overload, and earthing etc.
对四边形和方向圆特性阻抗继电器躲线路最大潮流的能力进行了详细分析，提出了距离保护负荷限制电阻的整定原则和整定方法，并给出了整定建议值。
It puts forward the setting principle and method of load limiting resistor of backup distance protection and gives the propositional setting value of load limiting resistor.
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