300 MW火电机组直流电源系统断路器保护配合校验

Protection coordination verification of circuit breaker in DC power system of 300 MW thermal power unit

为检验直流电源系统保护电器配置是否满足继电保护"四性"要求,以某电厂300 MW火电机组直流电源系统配置为基础开展校验分析,提出断路器保护配合校验系统性方案。通过对短路故障及过负荷情况下断路器保护配置的"四性"分别进行针对性综合检验,规范化直流系统保护配合校验流程,有助于直流系统保护"四性"的统一协调。结合保护配合校验实例,对该方案的实现过程进行具体阐述,为同类机组开展直流电源系统保护配合校验工作提供参考算例。

In order to check whether the configuration of DC power supply system protection appliances meets the requirements of"four characteristics"of relay protection,the verification analysis is carried out based on the configuration of DC power supply system of a 300 MW thermal power unit in a power plant,and the systematic scheme of coordination verification of circuit breaker protection is proposed.The"four characteristics"of the protection configuration of the circuit breaker under the condition of short-circuit fault and overload are respectively tested in a targeted and comprehensive way to standardize the verification process of DC system protection coordination,which is conducive to the unified coordination of the"four characteristics"of DC system protection.Combined with the examples of protection coordination verification,the realization process of the scheme is described in detail,which provides reference examples for the similar units to carry out protection coordination verification of DC power system.