摘要
大容量发电机组主电源发生事故时,备用电源自动切换的成功对于保证设备安全、稳定机组运行、减少事故损失具有十分重要的意义。介绍了一起厂用变压器综保装置动作故障中,400 V厂用电备用电源自动切换失效暴露出来的问题,分析了原因,提出了建议对策:对用于厂用电切换的重要综保装置应设置单独的保护出口继电器、优化厂用电切换控制逻辑、新增低压快切装置,由此可极大提高备用电源自动切换的可靠性,提高机组的自动化水平和安全性。
Abstract：When the main power supply of a large-scale power plant fails, it is very important to achieve an automatic switching to the stand-by power supply in terms of ensuring equipment safety, stabilizing equipment operation and reducing accident lost. This paper described a tripping accident of an auxiliary transformer protection relay, which was caused by failure in 400 V stand-by power supply automatic switching. Problems arising from the accident were summarized and analyzed. It has been suggested that the following measures should be adopted：a separate outlock relay should be designed for the stand-by power supply switching circuit; the automatic switching control logic of the stand-by power supply should be optimized; a low-voltage quick switch device should be applied. These measures can significantly improve the reliability of stand-by power supply automatic switching as well as the automation level and safety of equipment.
出处
《宝钢技术》
CAS
2014年第1期47-51,共5页
Baosteel Technology
关键词
备用电源
自动切换
失效
Key words： stand-by power supply
automatic switching
failure
