1000 MW机组高压厂用电电压等级优化

Optimizing on Voltage Classes of HV Electrical Auxiliary System of 1 000 MW Units

针对1 000 MW机组高压厂用电系统短路电流增大和大电动机启动困难等诸多问题,分析了选择高压厂用电电压须考虑的几个因素。经过对各方案选择、论述及比较,选择10 kV 1个电压等级方案。10 kV小容量电机与其他两个方案的电机相比除损耗及体积略大外,在总投资方面基本与选择第2个方案持平,此外,电厂的运行管理均优于其他两个方案,因此,推荐采用10 kV 1个电压等级。

Aiming at so much difficulties on short circuit current augment of HV electric auxiliary system and largesized motor switching on with difficultly of 1 000 MW units, this paper analysed the element of selection on HV electric auxiliary that should be taken into account. Through selection, expounding and comparing with each scheme, the total investment keeps balance with the second scheme except for the defect of of 10 kV small-sized motor ,it＇s cost higher on wear and tear and bulk bigger than the motors of the other two schemes. Moreover, operation and administration of electric power plant even superior to the other schemes, hence this paper recommended adopting 10 kV one voltage class.