铜街子水电站机组定子测温电阻改造研究

Study on Modification of Temperature Measurement Resistor of Generator Stator in Tongjiezi Hydropower Station

笔者对铜街子水电站发电机组参数和定子测温的电阻概况进行介绍,分析定子测温电阻故障原因,然后提出针对铜街子水电站13F机组定子测温电阻的整改方案,并对该改造方案的改造效果进行科学的评估。改造后的相关数据表明:更换后的线圈测温的测点可以较好地反映相关定子线圈的温度变化情况。但是,定子铁芯的温度变化比较慢,只有在1/4负荷的时候能相对准确地反映相关温度变化。其他负荷情况下的温升差距比较大,主要是由于测温电阻安装在通风沟内,但是不影响实际的使用,有经验的人员能够根据自身经验判断定子铁芯的实际温度。测温电阻更换改造完毕后,机组温升和带固定负荷试验显示效果良好,能满足现场运行人员监控机组运行状况的要求。

It introduces the generator unit parameters and stator temperature measurement resistor of Tongjiezi Hydropower Station,analyzes the fault reasons of stator temperature measurement resistor,and then puts forward the modification scheme for the stator temperature measurement resistor of 13F generator in Tongjiezi Hydropower Station,and makes a scientific evaluation on the modification effect of the scheme.After the modification,the relevant data show that the replaced temperature measurement points of the coil can better reflect the temperature change of the related stator coil.However,the temperature change of stator core is relatively slow,only when 1/4 load can reflect the relative temperature change accurately.The temperature rise difference under other loads is relatively large,mainly because the temperature measuring resistor is installed in the ventilation ditch,but it does not affect the actual use,because the experienced personnel can judge the actual temperature of stator core according to their own experience.After the replacement of temperature measuring resistor,the generator temperature rise with fixed load test shows good effect,which can meet the requirements of operators to monitor the operation of the generator.