凌津滩水轮机齿盘测频装置产生干扰信号的原因分析

Gear Speed Detector Noise Analysis of Lingjintan Hydropower Station's Turbine

频率信号是水轮机调速器控制系统基本的输入量。凌津滩水电厂水轮机调速器控制系统运用了残压测频和齿盘测频2种形式,由于齿盘连接在发电机延伸轴的法兰上,齿盘测频信号对机组主轴的摆动很敏感,当齿盘驱动轴与发电机主轴不同心时会产生周期性旋转跳动的干扰信号,该干扰信号使调速器主配压阀也随机组主轴旋转同步产生周期性的抽动和跳动现象。

Frequency signal is a primary input to hydro turbine governor control system.Both PT measuring frequency of residue voltage and gear speed detector（GSD） are used on hydro turbine governor control system of Lingjintan Hydropower Station.GSD signals are susceptible to turbine shaft swing,because GSD is connected to coupling of generator＇s extended shaft.GSD is connected to coupling of generator＇s extended shift.Periodical rotating bounce noise signal is produced when main shift of generator is not co-centered with driving shift of GSD.Main pressure valve of governor also synchronously rotates with main shift of the unit so,that produces periodical swing and bounce caused by Periodical rotating bounce noise signal.