本文選題：特高壓 + 站用變保護�。� 參考：《電力系統(tǒng)保護與控制》2014年24期

【摘要】：特高壓交流變電站站用電系統(tǒng)通常采用2級降壓的方式,2級串聯(lián)變壓器的主保護差動需引接110 kV和380 V側(cè)的CT電流。在低壓側(cè)故障時,低壓側(cè)電流有幾十千安培,而折算到高壓側(cè)僅幾百安培,由于兩側(cè)電流數(shù)據(jù)相差較大,給站用變的CT選型及站用變保護的配置、原理、整定帶來一些問題。通過研究"皖電東送"特高壓工程的淮南變電站低壓側(cè)設備配置方案和接線方式,結(jié)合實際工程情況及設備參數(shù),分析了特高壓交流變電站站用變保護的特殊問題。提出采用一套保護裝置中配置雙套電流轉(zhuǎn)換插件及兩套差動保護、后備保護的技術(shù)方案,并建立動模系統(tǒng)驗證了該原理方案的可行性。
[Abstract]:The main protection differential of UHV AC substation power station usually adopts two stage step-down mode and the main protection differential of the two-stage series transformer needs to lead to the CT current of 110kV and 380V side. In the low-voltage side fault, the low-voltage side current has tens of thousands of amperes, but the conversion to the high-voltage side is only a few hundred amperes. Due to the large difference in the data of the two sides of the current, the CT type selection for the station and the configuration and principle of the transformer protection for the station bring some problems. By studying the configuration scheme and connection mode of the low-voltage side equipment in Huainan substation, combining with the actual engineering situation and equipment parameters, the special problems of transformer protection for UHV AC substation are analyzed. In this paper, a technical scheme with two sets of current conversion plug-in and two sets of differential protection and backup protection in a set of protective devices is proposed, and the feasibility of the principle scheme is verified by establishing a dynamic model system.
【作者單位】： 哈爾濱工業(yè)大學電氣工程及自動化學院;西安科技大學電氣與控制工程學院;許繼集團;
【分類號】：TM63

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本文編號：2067007