Measures to prevent mechanical damage of switchgear

(1) For 7.2~12kV voltage class oil-less circuit breakers with brackets, the supporting insulators should be perpendicular and fixed to the brackets during installation. The connection of the upper and lower connecting leads should not be subjected to excessive stress, conductive rods and static touches. The head should be on a vertical line. If the insulator is found to be damaged, it should be replaced in time and the cause should be checked.

(2) The connection and fastening of various porcelain parts should be symmetrical and evenly applied to prevent the porcelain parts from being damaged by excessive force.

(3) During the inspection, the connecting arm, the connecting plate, the shaft and the pin of the switchgear should be inspected. If it is found to be bent, deformed or broken, the cause should be found, the parts should be replaced and preventive measures should be taken.

(4) When adjusting the switchgear, apply slow and slow check to check if there is any jam. All springs and buffers should be adjusted and used within the allowable stretching or compression limits, and regularly check for deformation or damage.

(5) The oil dampers of various circuit breakers should be properly adjusted. During commissioning, special attention should be paid to checking the buffer stroke of the oil damper and the bounce and opening bounce of the closing contact to verify that the damper performance is good and to prevent damage to the arm and transmission due to damper failure. It is forbidden to perform quick operation without oil in the buffer. Oil buffers used in low temperature areas should be buffer oil suitable for low temperature environmental conditions.

(6) To prevent the circuit breaker insulated rod rupturis running, in addition to the buffer should be checked periodically open and close, to prevent the poor insulation properties of the buffer rod in the transmission process by the impact, but also to strengthen whether the change in relative position of the monitoring sub-closing indicator of the insulating rod connected to the moving member, and Circuit breaker regular tests, in order to detect the problem. Insulation rods for "spiral" connection structures shall be modified.

(7) When the pressure equalizing capacitor is installed, it will prevent oil leakage caused by “not strong” and find that the oil leakage should be treated or replaced.

(8) the switching device base should not collapse, the displacement. The bracket design should be firm and reliable, and the cantilever beam structure should not be used.

(9) In order to prevent the mechanical fixed connection part from loosening, it is recommended to use anaerobic rubber to prevent loosening.