光纤复合架空地线接地方式的改进

Improvement of the Grounding Method of OPGW

为减少OPGW逐塔接地运行时较大的电能损耗,可将OPGW的接地方式改进为分段绝缘单点接地或全绝缘。这需要在OPGW悬垂、耐张线夹中加装带放电间隙绝缘子,采用绝缘引下夹具和高压隔离绝缘光缆接续盒等特殊元件。为此,以一条500 kV同塔双回线路为例,采用改进的OPGW接地方式,通过分析计算在正常、故障、检修状态下相关的感应电压、电流等参数,给出了这些特殊元件的选型及组装方式。最后通过分析组成OPGW线路系统各元件的安全可靠性,说明采用改进的OPGW接地方式的系统可以达到与逐塔接地的系统相近的安全可靠性。因此改进OPGW的接地方式在技术上是可行的,对建设"节能型、环保型"输电线路具有积极意义。

OPGW which is grounded at every tower causes more energy losses.Energy losses can be reduced largely by the improved grounding methods of OPGW which is grounded at one single point in one line section or insulated entirely in whole line.Taking a 500 kV double circuit transmission line on the same tower as an example,we used the improved grounding method of OPGW to analyze and calculate the related induced voltage and circuit parameters in normal,fault and maintenance conditions,and presented the type selection and assembly method for these special components.Analysis of each component in OPGW line system indicates that the OPGW line system adopting the improved grounding method can be achieved approximate safety and reliability level of the OPGW line system which is grounded at every tower.Therefore,the improved grounding method of OPGW is technically feasible and is of a positive significance to construction of ＂energy-saving,environmental protection＂ transmission line.