GW16/17-550型隔离开关缺陷原因分析及完善化改造

GW16/17-550型户外高压隔离开关在电网中应用广泛,而该型隔离开关普遍存在触头过热、运动卡滞、分合闸不到位等问题。为保证电网安全,针对该型隔离开关的内部结构进行分析,提出改进措施并在现场成功实施完善化改造。建议在隔离开关设计及制造时:减小动触头座定位螺栓与配合孔间的间隙;在导电管内操作杆上增设绝缘件并将绝缘滚轮换成不绣钢滚轮;尽量采用非焊接结构以及防锈材料;在下导电管内操作杆下端增加调整螺杆装配;上、下导电管接头处的缝隙,改用密封胶密封,有效防止雨水渗入导电管内。结果表明,实施完善化改造后设备运行良好,未再出现类似缺陷。

Analysis and Modification of GW16/17-550 Outdoor HV Disconnectors

The GW16/17-550 outdoor HV disconnectors are widely used in the power grid.However,this type of disconnectors has such defects as contact overheating,movement block,and insufficient switch.Therefore,the internal structure of this type of disconnector is analyzed in this paper,some corresponding feasible measures are raised,and some disconnectors are subsequently modified successfully.Some suggestions about the design and manufacture of the disconnectors are as follows: ①narrowing the gap between the positioning bolt of the active contact and the matched hole;②adding insulation part on the operation lever in the conductive tube and replacing insulation wheels by stainless steel wheels;③ adopting non-welded structure and rustproof material,and adding an adjusting screw at the bottom of operation lever in the lower conductive tube;④applying sealant to the juncture of the upper and lower conductive tubes to prevent rain infiltration.The result shows that after transformation,the modified equipment runs well,and no recurrence of similar defects occurs.