微机变压器差动保护灵敏度校验方法的探讨

Investigation of Sensitivity Calibration Method of Transformer Differential Protection

差动保护是变压器内部故障的主保护,保护必须对所发生的故障能够灵敏地进行反应,这就涉及到差动保护的灵敏度问题。如何快速、正确地校验差动保护的灵敏度对继电保护定值整定工作非常重要。文章以本地区电网220 kV变压器为模型,以本地区应用广泛并有代表性的四方CSC326D和南瑞RCS978E两种型号的变压器保护为例对差动灵敏度校验的方法和步骤进行了论述,并总结出了简便、实用的校验方法。

The differential protection is the main protection of transformer internal fault,the fauh protection must be able to react sensitively,which relates to the sensitivity of the differential protection. How to quickly, accurately check the sensitivity of the differential protection, that is very important for relay protection setting value. Based on the 220 kV transformer of the regional power grid for the model ,taking Sifang CSC326D and NARI RCS978E two models of transformer as an example that has been widely used and is representative in the area, the methods and steps of differential sensitivity calibration are discussed, and a simple and practical calibration method is summed up.