带限流电抗器的厂用分支回路的导体和电器选择

Selection of Conductor and Appliance of Auxiliary Power System Branch with Current-limiting Reactor

某热电联产集中供热热源项目扩建一台60 MW背压式汽轮发电机。因厂用分支回路无高压厂用变压器,直接从发电机出口引出,所以厂用分支回路短路电流较大,设计时在厂用分支回路装设一台限流电抗器,大大降低了厂用分支回路的短路电流值,回路导体和电器选择时更加经济、可靠。在此,对厂用分支回路的导体及电器选择进行分析及探讨。

Expansion of a 60 MW back-pressure steam turbine generator for the central heating source project of combined heat and power in a city.Since there is no HV auxiliary of the branch for auxiliary power system,it is directly drawn directly from the generator outlet,so the short circuit current of the branch is relatively large.When designing,install a current-limiting reactor in the branch for auxiliary power system,which greatly reduce the short-circuit current value of the branch circuit for auxiliary power system.The short-circuit current value of the loop is more economical and reliable when selecting loop conductors and electrical appliances.So,it analyzed and discussed the selection of conductors and electrical appliances of the branch for auxiliary power system.