水轮机调速器负荷异常上升原因分析及处理

Cause Analysis and Troubleshooting for Abnormal Load Rise of Turbine Governor

针对二滩水电站5号机组调速器在电网冲击时发生负荷异常上升现象,根据机组功给、功率及频率、残压测频突变波形,从调速器反馈方式切换逻辑入手分析了负荷异常上升原因,提出了频率超差增加延时判断条件、调整导叶开限等处理措施。实际运行情况表明,采取的措施简单可行,有效地避免了电网冲击对水轮机调速器的影响,为处理类似问题提供了参考思路。

For the abnormal load rise of No. 5 unit governor in Ertan Hydropower Station during the grid shock, the reasons for abnormal load rise as viewed from the switching logic of the governor feedback mode are analyzed according to the power and frequency, the residual voltage frequency - measuring sudden - change waveform. The measures are proposed, such as increasing time -delay determining conditions due to the frequency beyond tolerance and adjusting the opening limit of guide blade etc. The actual operation proves that the adopted measures are simple and feasible, and can effectively avoid the impact of grid shock on the turbine zovernor, which provides a reference for dealing with the similar nroblems.