低压灭磁开关触头发热分析及处理

Analysis and Recommendation on Contact Overheat of Low-voltage Field Discharge Switch

以国华太电8号机组一起灭磁开关主触头发热引起机组停机为例,介绍了框架式开关触头发热故障的危害,分析了造成低压灭磁开关柜触头发热的主要原因是接触电阻增加,讨论了接触压力、触头材料、触头温度及触头表面状况对接触电阻的影响,并提出有效的预防和处理措施,以确保安全可靠运行。

The harm of contact overheat of a frame type switch is introduced by taking the example of the shutdown of the No.8 generator traits in Guohua Taidian power plant caused by the overheat of the main contact of field discharge switch. The reason causing main contact overheat of field discharge switch is analyzed, and is believed to be the increase of contact resistance. The effects of contact pressure, contact material, contact temperature and surface condition of contact on contact resistance are discussed. Based on these analysis, effective preventing and handling measures are proposed to ensure safe operation.