昌房500kV紧凑型输电线路中的关键技术

昌平一房山500kV紧凑型输电线路已于1999年11月投入运行，该线路摒弃了常规的布置形式，将三相导线以等边倒三角形形式排列在同一塔窗内。每相导线采用六分裂形式，任意两相导线间的中心距为6．7m，因此，与常规线路相比，紧凑型线路走廊的占地宽度减少了17．9m。紧凑型线路的自然功率为1．34GW，比常规线路高34％，并已通过1．6GW大负荷试验。地面电场强度超过4kV／m的宽度为16m，较常规线路减少32m，从而减轻了电磁污染。此外，紧凑型线路可进行带电作业。

KEY TECHNOLOGIES FOR 500kV COMPACT TRANSMISSION LINE FROM CHANGPING TO FANGSHAN

The 500kV compact transmission line from Changping to Fangshan of Beijing has been put into operation in November, 1999 in which the conventional line arrangement is surmounted and the conductors of three phases are allocated in same tower frame and arranged in equilateral del form. The conductor of each phase is hexagon-bundled and the clearance between the centres of the conductors of any two phases is 6.7m, so that comparing with conventional transmission lines the width of occupied land for the corridor of this compact transmission line is reduced by 17.9m. The natural power of the compact transmission line is 1.34GW, i.e., 34% higher than conventional transmission lines and the 1.6GW massive load test has been passed. The width where the electric field intensity of ground surface exceeds 4kV/m for compact transmission line is 16m which is reduced by 32m than conventional transmission lines, thus, the electromagnetic pollution is reduced. Besides, the hot line work for the compact transmission line is available.