和应涌流对变压器差动保护影响分析

Analysis of sympathetic inrush current on transformer differential protection

石化企业110k V主变压器是全厂性的关键配电设备,为确保供电的可靠性,常采用并联运行的方式。当其中一台变压器检修后或故障后重新投入运行时,将会影响其他正在运行的并联变压器,有时会导致其差动保护误动作跳闸,造成不必要的停电。这种现象给企业的安全稳定运行带来影响,对变压器空载合闸及对其他并联运行变压器影响的过程进行分析和探讨,为工程设计及企业供电系统的可靠运行提供完善的措施。

The 110 kV main transformer in petrochemical enterprises is the key power distribution equipment of the whole plant.In order to provide the reliability of power supply,parallel operation is often adopted.When one of the transformers is put into operation again after maintenance or fault,other parallel transformers in operation will be affected,and sometimes the differential protection will trip,resulting in unnecessary power failure.This phenomenon has an impact on the safe and stable operation of the enterprise.This paper analyzes and discusses the process of no-load closing of transformer and the influence on other parallel operation transformers,so as to provide perfect measures for engineering design and reliable operation of power supply system of enterprises.