普光气田220kV变电站35kV系统接地设计

对具有四川电网内＂两个第一＂的普光气田220kV变电站的35kV配网接地方式进行了研究及总结。该站为四川电网内第一个主变压器35kV线圈采用三角形接线的变电站,为此两台主变压器共节省设备投资约360万元。该站为四川电网内第一个35kV中性点经中电阻接地、单相接地故障直接跳闸的配网系统,对今后类似工程的设计将起到较好的借鉴作用。

Grounding Design of 35 kV System in 220 kV Substation of Pugnang Gas Field

The grounding mode of 35 kV distribution network in 220 kV substation of Puguang gas field which has ＂Two Firsts＂ in Sichuan power grid is analyzed and summarized.Puguang 220 kV substation is the first substation that uses delta connection at 35 kV side of main transformer in Sichuan power grid,therefore,two mains transformers have saved the investment of the equipment about 3.6 million yuan.Also,it first uses medium resistance for 35kV neutral point grounding of distribution network in Sichuan power grid,and the protection equipment can trip as long as the single-phase ground fault happens.The design experiences can provide the reference for the design of subsequent project.