波形对称原理的变压器差动保护

TRANSFORMER DIFFERENTIAL PROTECTION BASED ON THE CHARACTERISTIC ANALYSIS OF THE FIRST AND SECOND HALF CYCLE OF THE MAGNETIZING IN-RUSH CURRENT

提出利用差电流导数的前半波与后半波作对称比较以区别励磁涌流和故障电流。用此方法实现的变压器差动保护，经试验证明动作可靠，抗干扰能力强。

By finding the derivatives of the phase differential currents of the magnetizing in-rush currents and then comparing the first half cycle with the second half. fault or in-rush current can be discriminated. Model device based on this principle shows that its operation is reliable and noise immunity is strong.