High-voltage switchgear mechanical fault diagnosis and treatment - Database & Sql Blog Articles

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The common mechanical failures of high voltage cabinets are: mechanical cascading failures, operating mechanism failures, etc. The fault parts are mostly loose parts, worn parts, improper adjustment of the limit.
1. Mechanical cascading failure: In order to ensure the correct operation of the switch, some mechanical interlocks are set in the switch cabinet. For example, when the handcart enters and exits the cabinet, the switch must be opened. The disconnector cannot be operated when the switch is closed. These types of faults come in many forms and should be searched along the mechanical transmission path. The general protection mechanism is relatively simple, rarely intersects with other organizations, and the search is convenient.
2. Operation mechanism failure: The most faulty part of the operating mechanism is the limit point offset. For example, in the CT8 type mechanism, the amount of engagement between the sector wheel and the trip axle is the key to mechanism adjustment. The amount of meshing is large, the tripping resistance is large, and it is easy to get stuck. The amount of meshing is small, it is easy to jump, and it cannot be closed. The method of adjustment is to change the length of the limit bolt and the length of the opening link.
Although the fault modes of the high-voltage cabinet are various, as long as several common electrical or mechanical faults of the high-voltage switchgear can be judged under the condition that the accident trips and the electric manual cannot be closed, the fault location is determined according to the fault phenomenon and the inspection result. Can troubleshoot quickly.