【摘要】 介绍TQXBZ-III多功能继电保护及变电站综合自动化实验培训系统的主要特点和功能,该系统具有使用性能强、功能灵活多变、接近电力系统实际等特点,可实现对常规继电器的特性和对数字继电器的特性测试,还可模拟110k V、10k V微机线路保护在电力系统故障时动作情况等功能。阐述了LZ-21方向阻抗继电器工作原理,分析其灵敏角和动作区域。采用多功能系统仿真测试,对比是否接入第三相电压消除或减小电压死区;测量方向阻抗继电器的起动阻抗,对其动作特性进行分析。更多还原

【Abstract】 The paper introduces the main functions and characteristics of TQXBZ-III,multifunctional relay protection and substation integrated automation experiment training system,which has the characteristics of strong usability,functional and flexible configuration,being close to actual power system,and so on. It can realize the function of testing and studying the characteristic of conventional relay,digital relay and the microcomputer line protection’s action in power system fault of 110 k V and 10 k V. Besides,this article describes the working principles of directional impedance relay LZ- 21,analyzes its sensitive angle and action areas. Then the action characteristic of the system is analyzed by the multi-functional system simulation test,by the means of comparing whether access to the third phase voltage to eliminate or reduce electricity crushing zone and measuring the starting impedance of directional impedance relay.更多还原