渔子溪电站发电机组转子线圈温升试验研究

利用3种方法，即双臂电桥电阻法、实时励磁电流电压电阻法和红外热成像仪测温法，在额定出力及超额定出力工况下，对渔子溪水电站4号水轮发电机组转子线圈开展了现场温升试验研究。研究结果表明：在既定参数工况下运行，4号机组转子线圈温升有很大的富裕度；在额定励磁电流下，转子线圈温升在70℃~80℃之间。但是，要准确确定4号机组转子线圈在低功率工况下的温升情况，则有待于在本次测试的基础上，改善现场测试条件并开展下一步专题研究。

Experimental study on temperature rise of rotor coil of hydro-generator unit in Yuzixi Hydropower Station

Using the measurement of double bridge resistance, the measurement of the real-time excitation current, voltage, and resistance, and the measurement of infrared thermal imager, the temperature rise of the rotor coil of No.4 hydro-generator unit in Yuzixi Hydropower Station was measured in field when the unit is in operating conditions of rated output and extra rated output. The results show that the rotor coil of No. 4 unit makes substantial allowance for temperature rise at a given output; the temperature rise hovers between 70℃ ~ 80 ℃ under rated excitation current. On the basis of this experimental study, a further research is necessary to accurately identify the rotor coil's temperature rise of No. 4 unit at a low output after the in-situ testing conditions are improved.