變電站直流電源系統(tǒng)環(huán)網(wǎng)故障分析
張譏培,劉亞娟,程意平
(國網(wǎng)河南省電力公司平頂山供電公司,河南 平頂山 467200)
摘 要:隨著對電網(wǎng)安全要求越來越高,因直流環(huán)網(wǎng)引起的繼電保護裝置拒動和誤動案例也越來越多。介紹了直流環(huán)網(wǎng)類型及原因,并討論了不同直流環(huán)網(wǎng)類型對直流電源影響表征現(xiàn)象和影響程度,發(fā)現(xiàn)按直流環(huán)網(wǎng)對直流系統(tǒng)的影響程度和緊急情況而言,兩極異極環(huán)網(wǎng)最為嚴(yán)重,單極異極環(huán)網(wǎng)次之,同極環(huán)網(wǎng)影響程度最小,為現(xiàn)場檢修人員提供了判斷依據(jù),縮短了故障查找和處理時限。
關(guān)鍵詞: 直流環(huán)網(wǎng);過渡電阻;對地電壓
中圖分類號:TM711 文獻標(biāo)識碼:B 文章編號:1007-3175(2023)07-0037-04
Ring Network Fault Analysis of DC Power Source System in Substations
ZHANG Ji-pei, LIU Ya-juan, CHENG Yi-ping
(State Grid Henan Electric Power Company Pingdingshan Power Supply Company, Pingdingshan 467200, China)
Abstract: As the requirements of power grid security become higher, more and more cases of refuse operation and false action of relay protection devices caused by DC ring network appear. The paper introduces the types and causes of DC ring network and discusses the effects of different types of DC ring network on DC power source characterization and influence degree. From the perspective of the influence degree of DC ring network on DC system and emergency situation, bipolar heteropolar ring network is the most serious, unipolar heteropolar ring network is the second, and homopolar ring network has the least influence degree. Therefore, the above conclusion can provide judgment basis for on-site maintenance personnel and shorten the time of fault search and treatment.
Key words: DC ring network; transition resistance; ground voltage
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