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Prevention of Cascaded Events of Distance Relay Zone Three Using Logic Controls

机译：使用逻辑控制防止距离继电器三区级联事件

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摘要

This paper presents a new method to prevent cascaded events caused by zone 3 elements of distance relays due to transmission line overload by using logic controls. A proposed adaptive distance relay algorithm provides a new concept to distinguish between actual faults and flow transfers and secures time to perform remedial controls by a defense system during cascaded events. Maloperation of distance relay is a very critical situation, leading to more operation of other distance relays and finally partial or total blackout. Logic controls are used to insure the operating decision through observing the system parameters and compare it with a setting already being input to the system. When distance relay is activated and the logic controls find that the system is healthy (unfaulted) and that the activation resulted from transmission line overload not real fault, the operation signal will be blocked to protect the system from maloperation.
机译：本文提出了一种通过逻辑控制来防止距离继电器的3区元件因传输线过载而引起的级联事件的新方法。提出的自适应距离中继算法提供了一种新概念，可以区分实际故障和流量转移，并确保在级联事件期间由防御系统执行补救控制的时间。距离继电器故障是非常关键的情况，导致其他距离继电器更多的操作，最终导致部分或全部停电。逻辑控件用于通过观察系统参数并将其与已经输入到系统中的设置进行比较来确保操作决策。当距离继电器被激活并且逻辑控制器发现系统运行状况良好（无故障）并且由传输线过载引起的激活不是真正的故障时，操作信号将被阻止以保护系统免受误操作。

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