摘要
在电力系统中,二次回路对保障系统安全运行起到非常重要的作用。系统正常运行情况下,为了保证人身和设备的安全,《国家电网公司十八项电网重大反事故措施》、《电力作业现场安全规程》规定电流互感器二次回路的一个电气连接必须有一个可靠的接地点。通过现场具体实例,提供了大量的实测数据作佐证,详细地论证了某110kV变电站由于主变差动电流回路多点接地,造成变压器差动保护误动的事例,辅以试验验证,提出解决问题的措施,并强调了电流互感器二次回路一点接地及接地点选择的重要意义,对现场工作具有现实指导价值。
The secondary circuits play an important role in ensuring safe running of power system. As the system runs normally, in order to protect persons and equipments, a reliable earth point must be guaranteed in every current transformer secondary circuit electric connection, this is regulated by 〈eighteen significant methods against accidents occurred in the state grid corporation〉and 〈safety regulations applied to electric jobsite operation〉 .Through specific instances and numerous experiment data, this paper thoroughly augments the transformer differential protection misacting owing to the differential current loop multipoint earth of the main transformer in a 110 kV transformer station.Additionally, it verifies these instances by experiments and puts forward a new approach to solve related problems. Specially, it emphasizes the significance of current transformer secondary circuit one-point earth and the earth location selecting, so it is valuable to onsite task.
出处
《继电器》
CSCD
北大核心
2008年第7期80-82,共3页
Relay
关键词
电流互感器回路多点接地
差动保护误动
分析
current transformer circuit multipoint earth
differential protection misacting
analysis
