发电机转子一点接地保护研究

Research on one-point grounding protection of generator rotor

转子接地保护是发电机变压器组保护系统中的重要组成部分,目前的转子接地保护由于保护原理的限制不能双套化,为了实现真正意义上的转子一点接地保护双套化配置,研究了转子一点接地保护的特点,给出了注入直流转子一点接地保护和注入交流转子一点接地保护同时运行的方案。两种转子一点接地保护既能同时投入运行,也可以单独运行。现场测试表明,转子一点接地保护双套化运行方案能满足现场要求。

Rotor grounding protection is one of the important parts of protection system of generator transformer unit. At present the rotor grounding protection cannot be double configured because of the protection principle. In order to become a real double configuration of one-point grounding rotor protection,the features of one-point grounding protection of rotors are studied.Simultaneous operation of injecting DC rotor one-point grounding protection and injecting AC rotor one-point grounding protection is put forward as a scheme. The two sets of on-one point grounding protection can be used dependently and independently. The field test indicates that the double configuration of rotor grounding protection can meet the operation requirements on site.