超高压输电线路架空地线直流融冰试验分析

验证超高压输电线路架空地线直流融冰的可行性。以500 kV桂林变电站融冰装置为例,确定超高压输电线路架空地线融冰接线方式,在此基础上介绍线路普通地线及OPGW地线融冰的仿真建模方式和特点。通过实际应用验证了超高压输电线路普通地线及OPGW地线直流融冰的可行性。在超高压输电线路架空地线融冰试验过程中,发现地线放电间隙过小导致直流融冰装置闭锁,架空地线融冰接线方式转变困难,普通地线和OPGW地线因过电流被烧断等问题。针对以上问题提出了解决办法。

Analysis of DC Ice Melting Test for Overhead Ground Wire of Extra-high Voltage Transmission Line

The feasibility of DC ice melting for overhead ground wire of extra-high voltage transmission line is testified. The melting ice device in 500kV Guilin substation is taken as an example to determine the connection mode of ice melting for overhead ground wire of high voltage transmission line based on which the ice melting simulation and modeling method and characteristics for ordinary ground wire of line and OPGW ground wire are introduced. The feasibility of DC ice melting for ordinary ground wire and OPGW ground wii~ of extra-high voltage transmission line is testified by practical application. Problems are found during the test process of DC ice melting for o,~erhead ground v~ire of extra-high ,~oltage transmission line,including that the too sinai1 discharge gap ~f grouted wire caused the ~ck ~f DC ice melting device, the change of connection mode of ice melting for overhead ground wire was difficult, and the ordinary ground wire and OPGW ground wire was bum out by over current. Solutions have been proposed to solve above problems.