【Daily Topic】【Electrical Edition 20160806】

(1) Check whether the actual capacity of the battery or silicon rectifier has decreased, resulting in an excessively low supply voltage during closing that exceeds the minimum allowable value for the closing voltage； 　　(2) Check the fuses or other operating elements in the closing circuit for any signs of melting, poor contact, or broken wires ； 　　(3) Check whether the main or auxiliary contacts of the closing DC contactor are faulty, and whether the electromagnetic coil of the contactor is damaged ； 　　(4) Check whether there is a fault in the closing coil itself (such as damaged inter-turn insulation) that results in insufficient electromagnetic attraction ； 　　(5) Check all components of the motor drive mechanism used for closing, to ensure there are no short circuits, broken wires, or poor contacts ； 　　(6) Check whether there are any issues such as the rod of the circuit breaker’s opening coil electromagnet getting stuck and failing to return to its original position.

⑴Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶Check whether the interlocking contacts in the tripping circuit are loose

⑴Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷Check whether the opening coil is damaged (short-circuited or open-circuited)

Q&A: How to diagnose and address electrical circuit faults that cause high-voltage circuit breakers to trip and fail? Answer: It can be inspected from aspects such as the mechanical parts, transmission mechanism, and electrical circuits. 1. Mechanical component failure: (1) Has the positioning element (or sleeve) of the transmission mechanism shifted, resulting in pressing or jamming issues that prevent proper operation? ； (2) Whether the connecting shaft of the transmission mechanism has come loose. 2. Operating mechanism failure (1) Check whether the overshoot adjustment of the closing core is sufficient ； (2) Check whether there is any jamming in the push rod of the closing core ； (3) Check whether the closing buffer gap has not been adjusted sufficiently, resulting in incomplete closing ； (4) Check whether the slope of the closing bracket is too steep, and whether there is insufficient contact between the bracket and the closing spindle, as well as any issues related to the bracket not being in the correct center position or slipping due to vibrations ； (5) Check the three positions of the partition connecting plate to see if there is any upward movement of the disconnection connecting plate during closing ； (6) Check whether the disconnection mechanism is stuck or has not returned to its original position ； (7) Check whether the reset spring of the mechanism has failed, etc. 3. Electrical circuit faults: (1) Check whether the actual capacity of the battery or silicon rectifier has decreased, resulting in an excessively low supply voltage during closing, which exceeds the minimum allowable value for the closing voltage ； (2) Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold ； (3) Check the fuses or other operating elements in the opening circuit for any poor contacts or short circuits ； (4) Check whether there is any poor contact in the interlocking contacts of the tripping circuit ； (5) Check whether the opening coil is damaged (short-circuited or open-circuited).

⑴Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷Check whether the opening coil is damaged (short-circuited or open-circuited)

(1) Check whether the supply voltage is too low, resulting in insufficient force on the tripping core or an unsatisfactory tripping threshold at low voltages； (2) Check whether there are any poor contacts or short circuits in the circuit breaker or other operating components of the opening circuit ； ⑶ Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷ Check whether the opening coil is damaged (short-circuited or open-circuited)

Is the load free from short circuits, overcurrents, or is the quick-break time setting correct?

⑴ Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵ Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶ Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷ Check whether the opening coil is damaged (short-circuited or open-circuited) ；

⑴ Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵ Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶ Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷ Check whether the opening coil is damaged (short-circuited or open-circuited) ；

⑴ Check whether the power supply voltage is too low, resulting in insufficient impulse for the opening core or an unsatisfactory low-voltage opening threshold； ⑵ Check the fuses or other operating components in the opening circuit for any poor contacts or short circuits ； ⑶ Check whether there is any poor contact in the interlocking contacts of the disconnection circuit ； ⑷ Check whether the opening coil is damaged (short-circuited or open-circuited) ；