220MW机组高压厂用电切换系统的改进

22 0MW机组高压厂用电自动切换采用的BZT装置存在的问题较多 ,已经越来越不能满足大机组对厂用切换的要求。目前 30 0MW机组多采用厂用系统快切装置 (PZH) ,实现厂用电的正常与事故切换 ,达到提高发电设备安全、可靠、稳定运行的目的。通过比较两种切换系统的区别 ,分析高压厂用电切换系统采用传统的BZT所存在的问题 ,提出了相应的解决方法及加以改进的设想。

Improvement of High Voltage Electricity Exchaging System in 220MW Units

High voltage electricity auto exchaging system in 220MW units use BZT instrallation, it has much problem. That is why it can't fit the request of large units. At present over 300MW units use PZH instrallation to realize normal and emergency electric exchaging for safety, trustworthy and sfabilty of the power equipments. This article raise corresponding solvable method and tentatice idea to the difference of this two exchaging systems and analysis the problem of tradition BZT instrallation.