乌东德水电站机组励磁系统热管整流柜设计及试验

Design and test of heat pipe rectifier cabinet for excitation system in Wudongde Hydropower Station

目前水电站机组励磁系统大功率整流柜普遍采用强迫风冷的散热方式,因此需要定期对功率框进行滤网更换和风道清灰;同时风机运行时也会产生比较高的噪声污染。为此,经过研究和试验,对乌东德水电站电厂励磁系统进行设计时,结合热管技术和智能均流功能,实现了大功率整流柜的自冷运行。介绍了热管原理、热管整流柜额定输出能力的核算方法,以及所用热管整流柜在瑞士ABB公司实验室进行的大电流温升测试情况。实践证明:这种热管整流柜在现场长期运行后的状态稳定,说明热管整流柜在最大水轮发电机组励磁系统中的运用获得了成功,这一创新技术可对今后大容量发电机组励磁系统的升级改造提供借鉴和参考。

At present,the high power rectifier cabinets for excitation system of generator sets in hydropower stations generally adopt the heat dissipation mode of forced air cooling,which needs to replace the filter screen and clean the air duct regularly.At the same time,the fan operation also produces high noise pollution.In the design of excitation system of the Wudongde Hydropower Station,the self-cooling operation of high power rectifier cabinet was realized by combining heat pipe technology and intelligent current sharing function.Heat pipe principle,calculation method of rated output capacity of heat pipe rectifier cabinet and high current temperature rise test of heat pipe rectifier cabinet in Swiss ABB company laboratory were introduced in this paper.The practice shows the heat pipe rectifier cabinet is in a thermal stable state after long-term operation in the field,which indicates that this application in the excitation system of the maximum hydrogenerator sets is successful,and provides reference for the upgrading and transformation of excitation system of large capacity generator sets in the future.