500 kV GIS升壓站主變合閘過電壓影響因素分析
劉守豹,童理,韋昌偉,康操,李欣
(大唐水電科學(xué)技術(shù)研究院有限公司,廣西 南寧 530007)
摘 要:氣體絕緣組合開關(guān)(GIS)在操作過程中會形成快速暫態(tài)過電壓,影響與之相連的一次設(shè)備尤其是變壓器的安全運行。為對GIS 升壓站主變合閘過電壓進行量化,采用電磁暫態(tài)分析軟件ATP-EMTP建立分布參數(shù)模型,對GIS升壓站設(shè)備投運情況、出線數(shù)量、變壓器與GIS母線連接管道的長度、避雷器與高壓繞組距離對主變合閘過電壓的影響進行仿真計算,得出了主變合閘過電壓的特點。分析認為GIS操作時波的折反射是導(dǎo)致合閘過電壓升高的主要原因,對于結(jié)構(gòu)復(fù)雜的GIS升壓站應(yīng)開展過電壓評估。
關(guān)鍵詞:氣體絕緣組合開關(guān)(GIS);分布參數(shù);合閘過電壓;ATP-EMTP;折反射
中圖分類號:TM59 文獻標識碼:B 文章編號:1007-3175(2020)05-0038-05
Analysis of Influencing Factors of Main Transformer Closing Overvoltage in 500 kV GIS Booster Station
LIU Shou-bao, TONG Li, WEI Chang-wei, KANG Cao, LI Xin
(Datang Hydropower Science & Technology Research Institute Co., Ltd, Nanning 530007)
Abstract: Gas insulated switchgear (GIS) will form a fast transient overvoltage during its operation, which affect the safe operation of the primary equipment connected to it, especially the transformer.In order to quantify the switching overvoltage of main transformer in GIS booster station, a distributed parameter model is established by using electromagnetic transient analysis software ATP-EMTP.The effects of equipment operation, number of outgoing lines, length of connecting pipeline between transformer and GIS bus, distance between lightning arrester and high voltage winding on switching overvoltage of main transformer are simulated and calculated, and the characteristics of switching overvoltage of main transformer are obtained.The analysis believes that the refraction of wave during GIS operation is the main reason for the increase of switching overvoltage, and overvoltage assessment should be carried out for GIS booster station with complex structure.
Key words: gas insulated switchgear(GIS); distribution parameters; closing overvoltage; ATP-EMTP; catadioptric reflection
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