西石变电所220kV变压器纵差保护误动分析

Malfunction analysis of 220 kV transformer differential protection of Xishi Substation

变压器纵差保护多利用谐波制动原理,通过对西石变220kV主变在空送电过程中发生谐波制动原理纵差保护误动的原因分析,提出了相应的改进及防范措施。

Most transformer longitudinal differential protections use harmonic braking principle. In view of harmonic braking conditions brought about in no-load operation of 220 kV main transformer of the Xishi Substation, this paper analyzes the malfunction reasons, and puts forward measures to ward off the malfunctions.