OPGW光纤复合架空地线异常发热现场测量分析及仿真

针对光纤复合架空地线(optical fiber compositeoverhead ground wire,OPGW)在变电站构架连接处的异常发热问题,对其接地回路感应电流、电压进行现场实测,分析出异常发热原因是构架处OPGW主接地不良导致接地电流转移至耐张连接回路,且发热功率较大及较集中。据此进一步开展OPGW感应电流、发热功率的仿真研究,仿真与实测数据基本吻合。研究表明线路负荷电流、杆塔接地电阻以及OPGW与构架连接接触电阻对OPGW接地回路分流及发热功率存在不同程度的影响。

On-site Measurement Based Analysis and Simulation of Abnormal Heating of Optical Fiber Composite Overhead Ground Wires

In allusion to the phenomenon of abnormal heating at the joint where the optical fiber composite overhead ground wire(OPGW) is connected to the truss of substation,the on-site measurement of the induced current and voltage of the grounding circuit of OPGW was performed,and based on the measured results the reason causing the abnormal heating was analyzed.Analysis results showed that the bad contact of OPGW with the truss made the grounding current of OPGW transferring to the circuit of tensional joint and the heating power was larger and concentrated.On this basis the simulation research on induced current of OPGW and heating power are conducted,and simulation results basically conform to the measured data.Research results show that power flow of transmission line,tower grounding resistance and contact resistance of the joint where OPGW is connected to the truss differently influence on the shunt of grounding current of OPGW and the heating power.