摘要
作为变压器主保护的差动保护，正确动作率始终在55％～65％左右，这对变压器的安全和系统的稳定运行很不利。根据变压器差动保护的基本工作原理，分析了变压器在不平衡电流、励磁涌流及差动电流互感器因素等作用下产生误动作的原因。通过现场工况实践结果，提出了相应的改进措施。
As the main differential protection of transformer, the correct moving rate is always around 55;65;, which is harmful to the safety and stable process of transformer. According to the basic working principle of differential protection of transformer, the paper analyses the disoperation cause by unbalanced electric current, magnetizing impedance, and differential current transducer. Certain improving measures are come up with through the result of spot condition practice.
出处
《上海电气技术》
2011年第2期18-22,共5页
Journal of Shanghai Electric Technology
关键词
变压器
差动保护
误动
改进
transformer
differential protection
disoperation
improvement measure
