750kV输电线路光纤复合架空地线的接地方式

Grounding Mode of Optical Fiber Composite Overhead Ground Wire of 750 kV

750 kV输电线路输送容量大、负荷电流水平高,在光纤复合架空地线(OPGW)上会产生很大的地线环流及环流损耗。为此采用理论计算与现场实际测量相结合的方法,对750 kV输电线路OPGW接地方式与地线环流损耗的关系进行了研究。计算结果与实际线路测量结果一致性较好,结果表明在普通地线与OPGW均逐基接地、普通地线分段绝缘一点接地而OPGW逐基接地、普通地线分段绝缘一点接地而OPGW换位接地3种接地方式中,以普通地线分段绝缘一点接地而OPGW换位接地时地线上的损耗最小。基于该研究结果,输电线路OPGW地线架设采用换位接地方式能够获得更大的经济效益。

The loop current and loop current losses on optical fiber composite overhead ground wire（OPGW） are remarkable due to the large transfer capacity and high load current of transmission line.We applied theoretical calculating and filed measuring method to research the relationship between grounding methods and loop current loss on OPGW of 750 kV transmission line.Calculation results and the actual line measurements are in good agreement.Results show that,among the three grounding methods,such as ground wire and OPGW grounding at every tower,ground wire segment-insulated grounding at one tower and OPGW grounded at every tower,and ground wire segment-insulated grounding at one tower and OPGW grounded transposition,the least loop current loss occurs in the third grounding methods.It is concluded that to change grounding methods of the OPGW grounding at every tower has better economic benefits.