大容量燃气轮发电机在起动过程中继电保护应采取的措施

Relay protection measures adopted by large scale gas turbine generator during its start-up

大容量燃气轮发电机几乎都采用变频起动方式,在变频起动过程中是否应加装专门的低频过流保护以及某些子保护是否应被闭锁的问题,当前在国内工程学术界有争论。详细分析了静止变频器(SFC)的起动步骤及起动过程中燃气发电机组的电压、电流、转速等参量随时间变化的特性以及逆功率保护、失磁保护等在启动过程中的特征,对变频起动过程中某些子保护是否应被闭锁提出了自己的见解。同时也对变频起动过程中加装低频过流保护的必要性以及该保护的应用提出了见解。

The start-up styles of gas turbine generators adopt frequency conversion almost, whether configure special low frequency over current protection and whether some sub-protections should be locked during large scale gas turbine generator frequency conversion start-up, For these questions, there are many arguments in China currently. Detailed analysis aims at the dissertation and some new views are presented in this paper. This paper analyzes the start-up step and the characteristics of voltage, current and rotate speed varied with times, and the characteristics of some protection such as reverse power and loss of field protections. It proposes its own opinion for some sub-protections whether should be locked or not, The necessity and the application of over current protection during start-up course are discussed.