Comparison Research On Overseas And Domestic 1000MW Generator-Transformer Protection

1000MW level power unit possesses the characteristics such as large capacity, high security requirements, so the generator-transformer protection also should use highly reliable equipment, in particular to avoid the protection misoperating or refusing to operate. Early million units’ protection device adopts imported variable group of protection device, but with millions of units of a large number of construction and the localization of generator-transformer group of improving continuously the protection requirements, millions of domestic microcomputer protection are increasingly used.Based on the first and second phase of the Tai Zhou power plant project, which respectively adopts GE generator-transformer abroad and domestic Nan Rui protection device, this article compares the differences between protection manufactures at home and abroad for the million kilowatt power plant. From the protection configuration, principle, etc, this paper discusses the localization of microcomputer protection in technology, security, reliability, stability which has a great advantage. Specific research content is summarized as follows:(1) Generator-transformer protection technology development process, technical requirements and function configuration requirements.(2) 125 MW/300 MW/600 MW/1000 MW group protection scheme comparison.(3) Level of 1000 MW generator protection technology at home and abroad are compared.(4) Level of 1000 MW unit transformer protection technology at home and abroad are compared.(5) The relay protection strategy in a complete set of electric start of 1000 MW lever unit.