高海拔抽水蓄能发电电动机电压开关设备绝缘水平修正研究  

Study on the Correction of Insulation Level for Voltage Switching Equipmentin High Altitude Pumped Storage Power Generation Motor

作　　者：李希哲 孙帆 鹿又水 LI Xizhe;SUN Fan;LU Youshui(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西安交通大学,西安710049

出　　处：《西北水电》2024年第5期122-125,130,共5页Northwest Hydropower

基　　金：陕西省自然科学基础研究计划(2023-JC-JQ-41).

摘　　要：为解决现有规范中发电电动机与开关设备的额定电压之间存在不匹配的问题,特别是在高海拔地区,从补充额定电压序列和绝缘配合的角度出发,通过发电电动机电压回路的最高运行电压确定绝缘水平标准,提出了发电电动机电压回路开关设备绝缘水平高海拔修正的合理方法,并以发电机断路器、隔离开关为例补充了额定电压21 kV这一序列的绝缘水平标准值。结果表明:设备在选择最高电压时应考虑不同工程的电压波动范围;发电电动机电压回路实际过电压水平较低,设备绝缘裕度较大;发电电动机电压回路设备进行高海拔修正时应先根据回路实际运行最高电压情况计算对应额定绝缘水平,直接按规范中的序列修正可能会造成设备选型困难;当回路实际运行最高电压未在规范标准电压序列中时,可采用插值法计算其对应绝缘水平,提高了相关设备适用的海拔范围,避免了在设备招标选型时的跳档问题,可节约工程成本。To address the mismatch between the rated voltage of generator-motors and the rated voltage of switching equipment in existing specifications,particularly in high-altitude areas where this mismatch can significantly reduce the usable altitude range of the equipment,this paper proposes a reasonable method for correcting the insulation level of generator motor voltage circuit switching equipment at high altitudes.Starting from the perspective of supplementing the rated voltage sequence and insulation coordination,the insulation level standards are determined based on the maximum operational voltage of the generator-motor voltage circuit.Using generator circuit breakers and isolation switches as examples,the paper supplements the insulation level standard values for the rated voltage sequence of 21 kV.The results indicate that the voltage fluctuation range of different projects should be considered when selecting the maximum voltage for equipment;the actual overvoltage level of the generator-motor voltage circuit is relatively low,providing a larger insulation margin for the equipment.When conducting high-altitude corrections for the generator-motor voltage circuit equipment,the rated insulation level should first be calculated based on the actual maximum operational voltage of the circuit,as direct correction according to the sequence in the specifications may cause difficulties in equipment selection.When the actual maximum operational voltage of the circuit is not present in the standard voltage sequence of the specifications,it is feasible to calculate the corresponding insulation level using interpolation methods.This conclusion greatly expands the applicable altitude range of the related equipment,avoiding the issue of voltage stepping during equipment procurement and selection,thereby saving costs for the project.

关 键 词：抽水蓄能 发电电动机电压开关设备 绝缘水平 高海拔修正 

分 类 号：TV743[水利工程—水利水电工程]