CAJ | 학술논문

±800 kV特高压直流输电线路杆塔可能采用分段复合绝缘子，针对采用分段式复合绝缘子可能带来的各种技术问题，开展了±800 kV直流线路V型分段式复合绝缘子串电场计算及均压特性、塔头空气间隙操作冲击放电特性和电晕特性试验等方面的研究。研究结果表明，V型分段式复合绝缘子串中间连接金具配置小均压环后，能有效改善中间金具端部的电场强度；操作冲击试验与单边采用单支绝缘子组成的的V型串塔头间隙没有明显差别，但放电路径会受到影响；中间金具在±1050 kV电压下均无电晕产生。根据研究结果，若特高压直流工程使用 V 型分段复合绝缘子，高、低压侧均压环配置仍可沿用特高压直流 V 型整支复合绝缘子的均压环配置方案，推荐直流分段式复合绝缘子的中间连接部位分别安装小均压环，以避免电弧对复合绝缘子端部压接区的影响。研究成果为后续特高压直流工程的设计和绝缘子选型提供技术依据。
±800 kV특고압직류수전선로간탑가능채용분단복합절연자，침대채용분단식복합절연자가능대래적각충기술문제，개전료±800 kV직류선로V형분단식복합절연자천전장계산급균압특성、탑두공기간극조작충격방전특성화전훈특성시험등방면적연구。연구결과표명，V형분단식복합절연자천중간련접금구배치소균압배후，능유효개선중간금구단부적전장강도；조작충격시험여단변채용단지절연자조성적적V형천탑두간극몰유명현차별，단방전로경회수도영향；중간금구재±1050 kV전압하균무전훈산생。근거연구결과，약특고압직류공정사용 V 형분단복합절연자，고、저압측균압배배치잉가연용특고압직류 V 형정지복합절연자적균압배배치방안，추천직류분단식복합절연자적중간련접부위분별안장소균압배，이피면전호대복합절연자단부압접구적영향。연구성과위후속특고압직류공정적설계화절연자선형제공기술의거。
It is possible to adopt segmented composite insulators in ±800 kV UHVDC transmission lines. In allusion to various technical problems possibly brought by adopting segmented composite insulators, the electric field strength calculation of V-shaped segmented composite insulator strings as well as the research on voltage equalizing characteristics, switching impulse discharge characteristics and corona characteristic test of air clearance at tower head are performed. Research results show that configuring small grading ring to the intermediate junction fitting for V-shaped segmented composite insulator string can improve the electric field strength at the terminal of intermediate fitting effectively;there is no obvious difference between the switching impulse test result of the V-shaped insulator string composed of single unitary insulator in each arm and that of V-shaped segmented composite insulator string, however the discharging path will be affected; there is no occurrence of corona on the intermediate fittings under the voltage of ±1 050 kV. According to experimental results, when V-shaped segmented composite insulators is used in UHVDC transmission project, the configuration scheme of grading ring for V-shaped insulator string composed of single unitary insulator in each arm can still be continued to use to the grading ring configuration at high and low voltage sides, and it is recommended that small grading rings are respectively installed to the intermediate junction positions of DC segmented composite insulators to avoid the affect of arc on terminal crimp area of composite insulator. The research results are available for technical reference in the design of follow-up UHVDC transmission projects and the type selection of insulators.