电厂PT慢熔故障分析及处理方法

Analysis and Treatment Method of PT Slow Melt Fault in Power Plant

在励磁系统中,机端PT是测量发电机机端电压的重要装置。由于PT本身的特性。PT断线是一种常见故障。该故障能否及时有效地进行判别,是继电保护装置正确动作的前提条件。新疆某自备电厂由于谐波和PT质量问题,频繁发生PT断线故障。由于该自备电厂机端电压波动大,PT断线发生后,励磁系统的PT断线检测来不及动作,容易引起过激磁保护。针对该电厂PT配置特点,本文给出了一种PT断线的实用判据方式。该方法可作为励磁装置检测机端PT断线的补充,不需要另行增加设备,经过现场验证,简单可行。

PT is an important device for voltage measure,and PT fault is common in power plant because of its characteristic.Therefore,how to check the PT fault effectively is a prerequisite for protection system.Because of harmonic and the quality of PT,lots of PT fault occurred in a power factory in Xinjiang,which were not checked immediately,and easily causing Vhz protection.Based on the system of the factory,this paper gives a method for checking PT fault,which is a good supplement for the original check method,and no additional equipment is required.The method is simple and feasible by on-site verification.