110kV变电站直流系统剖析

Analysis on DC Power System of 110 kV Substation

直流电源系统是变电站内部多数二次设备所需能量的来源,通过对旧有直流系统的改造能有效提高直流电源供应的可靠性和稳定性。讨论了直流电源的发展及其主接线方式,指出了其各自的特点和优势。对站内三种不同的直流负载及其电源设备作了分析和探讨,围绕供电的可靠性讨论了它们的工作方式及其转换关系。对站内直流系统之间的联系情况作了分析,探讨了直流系统发展趋势,同时针对现有直流系统存在的不足提出了一些改进意见。

DC power system,which used to provide energy for most of secondary equipment,could efficiently enhance the reliability and stability of the substation secondary systems by improving the old DC systems or adopting some new ones.The development and bus-arrangements of DC power systems were discussed.At the same time,the characteristics and advantages of each bus-arrangement were also presented.For the three different DC loads,the relationship and operation modes of their power supply systems were analyzed.The relations among the DC systems and the DC system development trend were both illustrated.For the defeats of the present DC systems,measurements were listed as well.