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以前我国城市中压配电系统的结线方式不够合理,根据国外和我国特区的中压电网现状及其发展,我国城市的中压配电网络应尽快推广环网结线方式,中压配电设备应多采用负荷开关+熔断器来代替断路器。 一、国内城市中压电网现状 我国80年代中期以前,10kV中压配电系统是以放射式为主,放射式与树干式相结合为辅的结线方式,很少采用环网结线。配电系统中开关设备的选用以断路器为主,很少采用负荷开关。据统计,我国负荷开关和断路器产量的比例大约是1∶10,10kV电压等级成套开关柜的受电、馈电柜几乎清一色
In the past, the connection mode of China’s urban medium voltage distribution system was not reasonable. According to the current situation and development of the medium voltage network in foreign countries and special zones in China, the medium voltage distribution network in cities in China should promote the ring network connection as soon as possible. Electrical equipment should use load switches + fuses instead of circuit breakers. First, the status quo of domestic cities in the piezoelectric network Before the mid-80s in China, 10kV medium voltage power distribution system is based on the radiation-based, radial and trunk-type combined with the auxiliary connection method, rarely used ring network connection. The selection of switchgear in distribution systems is mainly based on circuit breakers, and load switches are rarely used. According to statistics, the ratio of load switch and circuit breaker production in China is approximately 1:10. The power and feeder cabinets for the 10 kV voltage class switchgear cabinet are almost identical.