Common faults and causes of vacuum circuit breakers can be summarized into the following five categories, covering mechanical, electrical, and operational aspects:
1. Vacuum interrupter leakage
Causes: Tiny cracks may appear at the glass or ceramic seal due to vibration or impact during transportation or installation; defects in the vacuum bubble material or manufacturing process may lead to long-term leakage.
Symptoms: This usually occurs after one year of operation and is typically detected through a pressure test, requiring timely replacement.
2. Operating Mechanism Failure
Electrical Failure: Short circuit or open circuit in the closing/opening coil; abnormal operating power supply (voltage too high/too low); incorrect or broken wiring in the control circuit.
Mechanical Failure: Wear of transmission components (such as ratchet or pawl mechanisms); deformation or jamming of the opening rod, resulting in incomplete closing or weak opening.
3. Energy storage mechanism malfunction (common in spring-operated mechanisms)
Causes: Improper position or damage to the limit switch, or malfunction of the energy storage motor, resulting in insufficient energy storage or inability to release energy.
Consequences: The circuit breaker cannot be opened after closing, potentially leading to an escalation of the accident.
4. Abnormal Closing/Opening Operations
Closing without Operation: A malfunction in the closing holding mechanism or insufficient energy storage results in the contacts not closing properly.
Failure to Operate/Open: A secondary circuit malfunction or mechanical jamming manifests as no response to operating signals or the circuit breaker failing to operate.
5. Other Causes
External Factors: Excessive operating linkage distance affects the synchronicity of opening and closing, and long-term operation leads to a decline in mechanical performance.
Improper Operation: Misoperation or incorrect power switching may trigger the protection mechanism or directly damage the equipment.
Recommendations: Regularly perform vacuum level checks, withstand voltage tests, and mechanical component maintenance. Promptly check for electrical wiring errors to ensure the normal operation of the energy storage mechanism. When a fault occurs, prioritize checking the secondary circuit, then gradually check the mechanical parts.
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