500kV紧凑型线路相间间隔棒联接方式优化

Connecting Mode Optimization of Phase-to-phase Spacer in500 kV Compact Transmission Line

紧凑型输电线路的相间舞动一直是影响线路安全运行的因素之一,舞动跳闸的重合成功率较低,造成线路停运的几率大。特别是500 k V紧凑型线路,一旦发生舞动事故,将对系统造成很大影响,严重影响供电可靠性。目前,安装相间间隔棒是紧凑型线路最直接最有效的防舞措施,但现阶段相间间隔棒采取绞链式+球窝联结,该种联结金具是非标产品,联结金具长度调节范围小,安装和调整较为困难,且容易造成相间间隔棒球头部位受到集中应力,引起相间间隔棒球头断裂。针对500 k V紧凑型线路相间间隔棒球头断裂的情况,通过开展相间间隔棒联接方式的研究,研制了相间间隔棒配套用4点连接子导线间隔棒,并在数条500 k V紧凑型线路挂网试运行,效果良好。

Phase-to-phase galloping of compact transmission line has been one of the factors that influence safe opera- tion. The success rate of reclosing after tripping due to galloping was low,and the outage probability of transmission line was increased. Especially for 500 kV compact transmission line, occurrence of galloping would cause a great im- pact on power system and reduce the reliability of power supply. Installation of phase-to-phase spacer currently was the most direct and effective anti-galloping measures for compact transmission line. At present stage, phase-to-phase spacers were connected by hinge and ball socket, and this type of connection fittings was not a universal product with small adjustment range of length that was difficult to install and adjust. Thus this type of connection fittings was easy to cause stress concentrated in the head parts of phase-to-phase spacers which would even lead to breakage. Accord- ing to the breakage, a four-point connection sub-spacer was developed to match with phase-to-phase spacer after stud- y on connection methods. The application of this new type of fittings on several 500 kV compact transmission line ver- ified the effectiveness.