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针对长洲水利枢纽工程装机台数较多、发电机出口汇流母线短路电流较大及其操作过电压保护等问题,通过技术经济比较,确定了三机一变扩大单元接线方式的发电机电压配电装置,且该装置的设计选择了大容量开断能力的发电机专用真空断路器、带放电间隙的三相组合式过电压保护装置及大容量限流熔断器组合保护装置等设备,在确保发电送电安全可靠的基础上,不仅节省了大量设备和土建投资,且便于设备的日常运行维护。
In view of the problems such as the large number of installed units in Changzhou Water Conservancy Project, the large busbar short-circuit current at the outlet of the generator and the over-voltage protection of its operation, the voltage and power distribution of generator with three-unit-one-extension expansion unit is determined through technical and economic comparison Device, and the design of the device selected large-capacity breaking capacity of the generator-specific vacuum circuit breakers, discharge gap with the three-phase combined over-voltage protection devices and large current limiting fuse combination protection devices and other equipment, to ensure that the power generation Based on the safe and reliable power transmission, it not only saves a lot of equipment and civil investment, but also facilitates the daily operation and maintenance of the equipment.