摘要:电力系统继电保护是保证电力系统安全稳定运行、限制电力系统大面积停电事故最基本和最有效的技术手段。零序电流保护广泛地作为电力系统接地短路的保护，根据接地短路时零序电流的出现和大小作为故障特征量，变压器接地方式、非全相运行、单相自动重合闸等因素对零序电流保护的运行产生重要的影响，必要时需要采取相应闭锁装置。
本设计根据继电保护装置在电力系统中的应用，介绍了220kV电网继电保护的零序电流保护的整定设计。
设计过程如下，首先对电力系统网络的参数进行计算，绘制出各序序网图，然后选择合理的运行方式，计算各母线发生各种金属性短路故障时通过线路保护装置的短路电流，根据所得数据及所选的运行方式选择最佳的配合保护，并对各保护进行分析和整定计算，确定零序电流保护的整定值以及三相重合闸装置选型。
关键词：闭锁装置；零序电流保护；三相重合闸
ABSTRACT:Power system protection is to ensure the security and stability of the power system operation，restrictions on a large scale power blackouts most basic and most effective technological means．Zero-sequence current protection as a broad grounding power system short-circuit protection According to a short ground zero sequence current size of the emergence and features as fault，transformer phase operation．Single-phase automatic reclosing of factors such as zero-sequence current protection of the operation have a major impact，need to take the necessary corresponding device．
According to the design of protective relaying equipment in the power system，the application Details on the 220 kV high voltage power grid relay the zero-sequence current protection of the entire set design．
Design process are as follows，first on the power system network parameters，to map out the sequence network map then choose a reasonable mode of operation，Calculation of the bus occurred metallic short-circuit fault circuit protection device by the short circuit current．According to the data collected and choice of the mode of operation with the best choice of protection and the protection of analysis and tuning，identify zero-sequence current protection of the setting value and three-phase reclosing devices Selection．
Key words：Locking devices；Zero-sequence protection；Three-phase reclosing
