适用于双母线的继电保护方式对比分析与研究

Comparative Analysis and Research on Double Busbar Relay Protection Methods

母线在整个电力系统中起着至关重要的作用,而母线保护的性能对电力系统供电的安全性和可靠性也十分重要。对比分析母线完全式电流差动保护与母联电流相位比较式差动保护原理,针对保护死区从结构和控制回路上提出相应的改进建议。通过基于PSCAD电磁暂态仿真平台搭建220 kV经典双母线接线模型和改进后的母线继电保护模型,并给出了包括一次系统以及二次系统在内的仿真模型的详细信息。验证其可行性并从保护的可靠性上分析完全式电流差动保护与母联电流相位比较式差动保护在不同环境下的动作情况,探究其适用范围。综合对比分析两者保护原理上的优劣,为进一步完善和发展微机型母线保护提供参考依据,同时为母线保护的电磁暂态仿真工作起到一定的借鉴意义。

Busbar plays a vital role in the whole power system,and the performance of bus protection is alsovery important to the safety and reliability of power supply in the power system.The principle of bus completecurrent differential protection and bus current phase comparison differential protection is compared and analyzed.Suggestions for improvement of dead zone protection structure and control circuit are put forward.PSCAD simulationsoftware was used to build the 220 k V classic double bus wiring model and the improved bus relay protection model.The feasibility of the model was verified,and the operation conditions of complete current differential protection andbus current phase comparison differential protection in different environments were analyzed from the reliability ofthe protection,and the scope of application was explored.The advantages and disadvantages of the two protectionprinciples are compared and analyzed comprehensively,which provides reference basis for the further improvementand development of microcomputer bus protection.