Judgment and treatment of mechanical failure of high-voltage switchgear
Common mechanical failures of high-voltage cabinets are: mechanical interlocking failures, operating mechanism failures, and so on. Most of the faulty parts are loose fastening parts, wear of transmission parts, improper limit adjustment, etc.
1. Mechanical interlock failure: In order to ensure the correct operation of the switch, some mechanical interlocks are set in the switch cabinet. For example, the switch must be open when the handcart enters and exits the cabinet. Do not operate disconnectors, etc. when the switch is closed. This kind of fault has various forms and should be searched along the mechanical transmission path. The general protection mechanism is relatively simple, and rarely intersects with other agencies, making it easier to find.
2, the operating mechanism failure: the most malfunctioning part of the operating mechanism is the limit point shift. For example, in the CT8 type mechanism, the meshing amount of the sector wheel and the trip axle is the key to the adjustment of the mechanism. The larger the amount of meshing, the greater the trip resistance, and the more likely it is stuck. The meshing amount is small, it is easy to jump continuously, and it cannot be closed. The adjustment method is to change the length of the limit bolt and the length of the opening link.
Although the fault forms of the high-voltage cabinet are various, as long as several common electrical or mechanical faults of the high-voltage switch cabinet can be judged in the event of an accident trip and the electric manual cannot be opened and closed, and the fault location is determined according to the fault phenomenon and inspection results, Can quickly troubleshoot.
The above contents are compiled according to the problems encountered by the students in their actual work for reference. If there are any problems, please communicate and correct them in time.