适用于多种供电方式的节点联锁保护方法

Node Interlocking Protection Suitable for Various Power Supply Modes

目的:为了解决多电源供电系统目前存在的多个继电保护问题,需对适用于多种供电方式的节点联锁保护方法进行分析研究。方法:阐述了目前城市轨道交通供电系统继电保护存在的问题,提出了节点联锁保护方法。用节点来界定相邻保护,规定各种保护的正方向指向,通过正反方向判定,确定电流顺向和逆向指向。着重研究了逆向闭锁式保护、允许式保护、逆向失灵保护的发信判据和动作判据。结果及结论:结合应用举例证明了基于该方法的允许式保护和逆向闭锁式保护有效克服了传统无方向闭锁式保护在多电源系统可能的拒动问题,且允许式保护的动作时限比传统无方向闭锁式保护允许的动作时限短。即使线路之间光纤纵差保护没有工作或没有配置,该方法仍然能够对各种供电方式下的故障提供完备的保护。

Objective:In order to solve the multiple relay protection problems in multi-power supply systems,it is necessary to analyze and study the node interlocking protection methods applicable to various power supply modes.Method:Problems existing in the relay protection of urban rail transit power supply system are elaborated,and the node interlocking protection method is proposed.The adjacent protection is defined by the node,and the positive direction of various protections is specified.The current forward and reverse directions are determined through positive and reverse direction judgement.The signaling criteria and action criteria for reverse blocking protection,permissive protection,and reverse failure protection are mainly studied.Result&Conclusion:Combining application examples,the effectiveness of permissive protection and reverse blocking protection based on this method is proven in overcoming the possible refusal tripping problem of traditional non directional blocking protection in multi-power systems,and the action time delay of permissive protection can be shorter than that of traditional non directional blocking protection,even if the fiber optic differential protections between lines is not working or configured,This method can still provide complete protection against faults in various power supply modes.