微机式发电机励磁回路一点接地保护的研究  

Study on One-point Grounding Fault for Digtal Generator Protection

作　　者：张波 

机构地区：[1]山西电力晋城供电分公司,山西晋城048000

出　　处：《电力科学与工程》2007年第2期1-4,8,共5页Electric Power Science and Engineering

摘　　要：针对发电机实际运行中所出现的励磁回路一点接地故障情况,讨论了一种发电机转子一点接地变电桥式微机保护方案,推导了计算接地电阻及接地点位置的数学方程。通过其灵敏度的理论分析并考虑实际问题,确定了一种较为合理的电路结构,给出了保护的实现方法和改进措施,提高了保护的灵敏度及可靠性。According to the fact that one point grounding fault of generator exciting winding occurs when a generator is really running in use, a better solution of variable bridge type microcomputer protection for one point grounding fault of generator exciting winding is demonstrated in this paper. The equations for grounding resistance and ground location calculations are derived. A more reasonable circuit structure is chosen through the theory analysis of sensitivity and the reality is considered. This paper also analyze the real problems of the grounding protection and put forward the way of improving the sensitivity and reliability.

关 键 词：发电机 励磁回路 一点接地故障 变电桥 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]