两台三绕组变压器并列运行的差动保护

露天矿的采、运、排设备大都为电气设备，保证露天矿设备的安全供电，对露天矿的正常生产非常重要。随着负荷的变化，变电站的运行方式也在不断变化，主变压器的分列和并列运行非常频繁，作为变压器主保护的差动保护也应该及时做出调整。文章对两台三绕组变压器并列运行时的差动保护作了计算分折，以用于指导变电运行工作。

Differential Protection of Parallel Operation of Two Set of Three-winding Transformer

Most of the equipment for mining, transporting and discharging in strip mine is electric equipment. It is very important to guarantee the safe power supply of the equipment in strip mine for the normal production of strip mine. But along with the changing of electric load of devices, the running way of transformer substation is changed simultaneously, and the main transformer changes frequently continually between dividual running and abreast running, and the differential protection should be adjusted timely as the main protection of transformer. This paper makes calculation and analysis on the differential protection of abreast running of the two set of three-winding transformer, which can be used to guide the running of the transformer substation.