CAJ | 학술논문

特高压紧凑型线路输电工程的关键技术之一是限制过电压水平和合理选择线路绝缘水平。为此，基于两个500kV区域大电网之间采用1000kV紧凑型线路作为联络线的特高压系统，采用EMTP程序，重点研究了长度为100～500km的紧凑型线路的工频和操作过电压，统计分析了线路合闸和单相重合闸相地和相问过电压的波前时间和相间过电压的电压分配系数。，以及它们与操作过电压幅值的关系。提出了避雷器额定电压可选828kV，1ms波前时间和a=0．4系数可用于真型杆塔塔窗和档距中央的操作波间隙试验。紧凑型线路的绝缘配合表明，操作过电压对塔窗处的相地空气间隙大小起控制作用，偏严考虑，海拔1000m地区的塔窗相地和相间操作波最小空气间隙可分别选为7．5m和10．9m，工频电压和操作过电压要求的档距中央的最小空气间隙可分别选为4．6m和9．7m。
특고압긴주형선로수전공정적관건기술지일시한제과전압수평화합리선택선로절연수평。위차，기우량개500kV구역대전망지간채용1000kV긴주형선로작위련락선적특고압계통，채용EMTP정서，중점연구료장도위100～500km적긴주형선로적공빈화조작과전압，통계분석료선로합갑화단상중합갑상지화상문과전압적파전시간화상간과전압적전압분배계수。，이급타문여조작과전압폭치적관계。제출료피뢰기액정전압가선828kV，1ms파전시간화a=0．4계수가용우진형간탑탑창화당거중앙적조작파간극시험。긴주형선로적절연배합표명，조작과전압대탑창처적상지공기간극대소기공제작용，편엄고필，해발1000m지구적탑창상지화상간조작파최소공기간극가분별선위7．5m화10．9m，공빈전압화조작과전압요구적당거중앙적최소공기간극가분별선위4．6m화9．7m。
One of the key technologies of 1000 kV UHV Compact Transmission line project is to limit overvoltage and to reasonably select insulation level. We researched the power frequency and switching overvoltage of the 1000 kV UHV compact transmission line with line length from 100 km to 500 km by means of EMTP on the basis of a project of UHV AC compact joint transmission line between two 500 kV power network. The front time of overvolt- age of energizing unload line and single phase reclosing, and the a factor of phase-phase switching overvoltage are statistically analyzed, and the relationship of the front time and a factor to overvoltage amplitude is also analyzed. The 1ms front time of switching impulse and a= 0.4 parameters can be used to test air clearance of full scale line tower. The insulation coordination results indicate that the phase-ground air clearances of tower window are con- trolled by switching overvoltage, the rated voltage of arrester can select 828 kV, the minimum phase to ground and phase-phase air clearance of tower window at attitude 1000 m area can select 7.5 m and 10.9 m respectively by strict consideration, the minimum phase to phase air clearance required by power frequency operation voltage and switching overvoltage at middle of line span can select 4.6 m and 9.7 m accordingly at attitude 1000 m area.