4×300MW机组厂用电快切过程分析及其对继电保护的影响

Analysis of Using 4×300MW Factory Use Generating Set to Do Quick Cutting and Its Impact on Relay Protection

厂用电源的快速切换技术近年来已经在大型发电机组厂用电系统中日益运用成熟,显示出它对确保机组稳定运行的优越性,并已在生产实际中积累了丰富的运行经验。本文分析了厂用电切换过程中的动态特征,并给出了工程计算的方法,以及针对快切失败、快切过程中对电机差动保护的影响等现场实际问题提出了解决办法及建议。

In recent years, technology of quick switching of factory use power supply becomes more and more mature in factory power use system of large generating set, showing its advantages in ensuring stable running of set, and accumulating rich operation experience in practical production. This paper analyzes dynamic characters in process of switching factory power supply, gives method of engineering calculation, and puts forward solution and recommendation in terms of site practical problems such as impact on motor differential protection in process of auick failure and auick cuttina.