某厂在发变组保护改造过程中的CT极性问题

CT Polarity Problem in the Process of Protection Reformation of Generator-transformer Unit in a Factory

众所周知,电流互感器的极性问题对于差动保护是非常重要的,而在新投产机组或者改造项目中,因极性错误而发生保护误动的情况时有发生。以某电厂300MW机组发变组保护改造为实例,详细介绍了改造中电流互感器配置发生变化时,极性的确定方式,为电气人员在面对同类问题时提供一些参考。

As we all know,the polarity problem of current transformers is very important for differential protection.In the newly commissioned units or retrofit projects,protection malfunctions often occur due to incorrect polarity.Taking the transformation of the generator-transformer group protection of a 300MW unit in a power plant as an example,the method of determining the polarity when the current transformer configuration changes during the transformation is introduced in detail to provide some references for electricians when facing similar problems.