贾德研
摘要:备用电源自投装置厂用电切换一般采用工作开关辅助接点直接联动备用电源投入,这种高压厂用电自动切换存在的问题较多,甚至导致厂用电事故扩大,造成厂用电切换可靠性大大降低。本文从对用电设备安全、可靠、稳定运行的观点出发,分析了高压母线自动切换采用备用电源自投装置所存在的问题及厂用电切换过程中残压的影响,提出了采用新型的厂用电快切装置,而要采用合理的运行方式,来提高机组的安全、可靠、稳定运行。
关键词:备用电源 设备安全 合理运行可靠、稳定
Abstract: standby power source automatic switching device of auxiliary power switching generally use the switch auxiliary contact direct linkage standby power supply, the high voltage electricity automatic switching there is more problematic, even lead to electric power plant accident, cause of auxiliary power switching reliability greatly reduced. This article from the electrical equipment safe, reliable, stable operation point of view, analysis of high voltage switch automatically using the backup power automatic switch device of the existing problems and auxiliary power switching process of residual pressure influence, put forward the new auxiliary power fast switching device, and to adopt a reasonable operation mode, to improve the unit's security, reliable, stable operation.
Key words: standby power equipment reasonable and safe reliable operation, stable
中图分类号:TN86文献标识码:A 文章编号:
1.备用电源自投装置(BZT)存在的问题
10kV高压厂用电一次接线方式为单母线分段,高压电机均分在各段母线上运行。为了保证厂用电的可靠性,各段母线都设有备用电源。当工作电源跳闸或母线电压消失时,备用电源自动投入,使厂用电连续运行而不中断。但是,目前厂用电备用电源自投装置切换方式是没有快切功能,也没有母线永久性故障的闭锁,有可能造成以下问题:
一:切换时间过长有可能造成运行中断或设备冲击损坏,此外随着机组容量增大,厂用电容量不断增大,其中多为感性负载,切换过程中母线电压由于反馈电势的存在而衰减较慢,切换时必须考虑到反馈电压与备用电源电压问的压差引起电流电压冲击问题,造成备用电源跳闸厂用电中断、设备损坏或寿命缩短的后果,给厂用电稳定连续运行带来了不利的因素。……