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珊溪水电厂位于浙江省温州市文成县境内的飞云江上,首台机组于2000年6月开始投产发电。电厂安装4台混流式水轮发电机组,总装机容量200MW,年平均发电量3.55亿kWh。电厂出线由220kV电压等级接入华东电网,在华东电网中起调峰、调相和紧急事故备用等作用。直流系统在正常情况下为控制信号、继电保护、自动装置、断路器跳合闸操作回路等提供可靠的直流电源,当发生交流电源消失事故情况下为事故照明、交流不停电电源和事故润滑油泵等提供直流电源。直流系统可靠与否对发电厂和变电所的安全运行起着至关重要的作用,是安全运行的保证。为保证电网以及发电机组的安全运行,提高电网输电质量。因此对本电厂的已经运行了十几年直流系统需进行改造。为了安全过渡新上直流系统,先保留原直流系统,把原直流系统改造为双母线合并为单母线,称第一套直流系统,而新上系统,称第二套直流系统,安装在电厂端副厂房三楼。等正常运行一段时间以后,再改一套直流系统。
Shanxi Hydropower Plant located in Wencheng County, Wenzhou City, Zhejiang Province Feiyun River, the first unit in June 2000 began production. Four Francis turbine units are installed in the power plant, with a total installed capacity of 200MW and annual average generating capacity of 355 million kWh. Power plant outlet access by the 220kV voltage level East China Power Grid, East China Power Grid in the peak, phase modulation and emergency backup and so on. DC system under normal circumstances for the control of the signal, relay protection, automatic devices, circuit breaker trip switching circuit to provide reliable DC power supply, in the event of AC power loss accident accident lighting, AC non-stop power supply and accident lubrication Pumps provide DC power. DC system reliability or not for the safe operation of power plants and substations plays a crucial role, is the guarantee of safe operation. In order to ensure the safe operation of the power grid and generating units, improve the power transmission quality. Therefore, this power plant has been running a dozen years of DC system needs to be transformed. In order to safely transition to the new DC system, first retain the original DC system, the original DC system into a double bus into a single bus, said the first set of DC systems, and the new system, said the second set of DC systems installed in the power plant Deputy plant on the third floor. After normal operation for a period of time, then change a DC system.