新型变压器差动保护原理分析及应用

采用谐波闭锁方式的变压器差动保护在差流中含有比较低的谐波分量的励磁涌流情况和变压器过励情况下往往不能正确动作。论述一种变压器差动保护的新方法 ,即采用偶次谐波制动、直流分量和五次谐波闭锁的方法。

Theory Analysis and Application for New Transformer Differential Relays

Transformer differential relays which use harmonic blocking methods do not work in magnetizing inrush conditions with very low harmonic content in the operating current and transformer over-excitation conditions. This paper describes a new approach for transformer differential protection, the new method uses even harmonics for restraint and also blocks operation using the DC component and the fifth harmonic.