500kV主变压器压力释放误告警原因及处理

Analysis of the cause and treatment of the false alarm of the 500kV main transformer pressure-relief valve

压力释放阀是变压器主要的非电量保护装置之一,压力释放阀误动作会引起变停运事故,其电气回路绝缘不良还会引起护装置误发信号或直流接地缺陷。本文由一起500kV主变压器压力释放误告警缺陷引出,分析了压力释放阀由于位置设计和安装工艺造成的运行安全隐患,得出结论可应用于新投设备验收及检修维护工作中。

The pressure-relief valve is one of the main non-electricity protection devices of the transformer.The malfunction of the pressure-relief valve can lead to shutdown accidents of the main transformer,and the poor insulation condition of its electrical circuits can also cause the protection devices to send signals incorrectly or DC ground defects.This article aims to illustrate a false alarm defect of the pressure-relief valve in a500kV main transformer,analyzed the operational safety hazard caused by the position design and installation process of the pressure-relief,the conclusion of which can be applied to the acceptance and maintenance work of the newly-invested devices.