超超临界1050MW机组400V母线自动调压器烧损异常探究
2019-09-10郭航郭建仙刘林城
郭航 郭建仙 刘林城
摘要:电力系统运行中经常发生电气设备过热损坏等事故,若发现不及时或处理不当甚至造成电力设备烧毁、火灾、事故范围扩大等严重后果。本文针对某电厂两台超超临界1050MW机组400V照明PC段自动调压器发生过热烧损异常情况,通过原因分析、过程处理、措施防范等方面探讨,为确保大型火电机组电气设备安全稳定运行积累宝贵经验。
关键词:电气设备;火灾;稳定运行
Research on abnormal burning of 400V bus automatic voltage regulator of 1050MW Ultra-supercritical Unit
Guo hang Guo jian xian Liu lin cheng
Shen hua Fu neng Power Generation Co., Ltd
Abstract:In the operation of power system, accidents such as overheating and damage of electrical equipment often occur. If it is not timely or improperly handled, it will cause serious consequences such as the burning of power equipment, fire and the expansion of the scope of the accident. According to Shen hua Fu neng Power Generation Co.,Ltd 2×1050MW ultra-supercritical 400V lighting PC pressuretrol overheating burning abnormal situation, discussed through the analysis of the reasons, process and measures of prevention and other aspects, to ensure the safe and stable operation of large power electrical equipment and accumulated valuable experience.
Keywords:electrical equipment ,fire ,stable operation
某電厂地处中国东南沿海,夏季机组负荷高,面临着潮湿、多雾、多雷雨、多台风、高温闷热等气候,对设备可靠性要求较高。近年来电力系统电气设备火灾时有发生,电气运行设备作为全厂运行命脉,在夏季保证安全稳定运行,尤显重要。
1 概况
6月22日,机组400V照明PC段自动调压器发生柜体冒浓烟,打火花,着火迹象。照明PC段自动调压器上口即为照明变,若火势扩大、蔓延可能导致6kV母线失电设备损坏、机组非计划降出力、甚至非停,后果不堪设想。异常发生后,当班运行人员当即通过切换事故照明MCC电源,隔离异常设备机组照明PC段自动调压器,照明变及照明PC段母线停电测绝缘等工作,将照明PC段母线由备用电源恢复送电。
1.1 事件处理过程
1.1.1 发现机组照明PC段母线电压、机组事故照明MCC段母线电压波动,最低至355V,机组照明PC段电流119A、机组事故照明MCC段电流23A,令巡检至就地检查核对;
1.1.2 就地发现机组汽机房400V配电间内有明显焦臭味且机组照明PC段上自动调压器柜体冒浓烟,打火花,有着火迹象,值长立即通知消防队机相关人员到场协助处理,巡检开启就地轴流风机;……
