摘要
针对某1000MW超超临界机组汽轮机轴瓦振动保护的误动,结合国内已投产的上海汽轮机厂采用西门子技术生产的29台1000MW汽轮机组的瓦振保护情况,对VM600的轴振保护及NOT OK信号的机理和保护误动的原因进行了分析,由于VM瓦振传感器采用的是压电式加速度探头,灵敏度较高,电缆接地不规范、感应电压大、移动电缆和探头安装不规范等原因会导致NOT OK信号误发,VM600又将NOTOK信号延长到了10s,使保护误动的几率加大。通过修改VM600程序、加强屏蔽和接地的方法等措施保证信号测量的准确性,并遵循原西门子汽轮机轴瓦振动保护逻辑可有效地保证机组的运行安全。
Focusing on the malfunction of 1 000-MW ultra-supercritical turbine bearing pad vibration protection in combination with the investigation into turbine bearing pad vibration protection of 29 1 000-MW turbines adopting Siemens technologies in 21 power plants,the mechanism of VM600 NOT OK signals and the causes for the malfunction are analyzed.Due to the high sensitivity of the probe,whenever there is nonstandard cable grounding,high induced voltage or improper installation of moving cables and probes,the NOT OK signals will be issued incorrectly.In addition,this signal in VM600 is extended to 10 seconds,which amplifies the influence of this mistake.By modifying the program of VM600,enhancing shielding and grounding to ensure the accuracy of the measurement,power plants using Siemens turbine technology can operate safely if they abide by the protection logic of the original design.
出处
《中国电力》
CSCD
北大核心
2012年第12期7-11,共5页
Electric Power
关键词
超超临界机组
汽轮机轴瓦振动
保护误动
VM600
ultra-supercritical unit
turbine bearing pad vibration
protection malfunction
VM600
