I. Obvious Faults or Abnormal Phenomena
Severe Insulator Damage/Discharge
Cracks, bursts, or continuous discharge phenomena appear in insulating components such as bushings and porcelain insulators.
Abnormal Vacuum Interruptor
Abnormal surface color of the vacuum bulb (e.g., large-area whitening, metal deposition), signs of leakage (discharge sounds or abnormal glow within the interruptor).
Decreased vacuum prevents the arc from extinguishing during opening, resulting in continuous internal arcing.
Operating Mechanism Fault
Spring mechanism not energized, severe pressure leakage in the hydraulic mechanism, abnormal pressure in the pneumatic mechanism.
Abnormal opening/closing position indication; actual status does not match mechanical/electrical indications.
Severe Overheating, Smoke, or Fire
Abnormally high temperature at terminals or busbar connections (exceeding permissible values), or smoke or fire.
A burnt smell or abnormal smoke is present inside the circuit breaker body or mechanism box.
Abnormal Noises and Vibrations
Continuous internal discharge crackling or popping sounds, or abnormal jamming or impact sounds during opening/closing.
II. When Protection Devices Trip or Monitoring Systems Issue Alarms
Protection Device Trips
After a relay protection device (such as overcurrent, instantaneous overcurrent, zero-sequence, etc.) trips, power must not be forcibly restored until the cause is identified and the fault is rectified.
After a short-circuit fault trips, the circuit breaker's arc-extinguishing chamber and contacts must be inspected for potential damage.
The Monitoring System Issues a Critical Alarm
Key alarms such as low SF6 gas pressure alarm (if applicable), vacuum alarm, and control circuit disconnection.
III. When Operating Parameters Severely Exceed Standards
Overload Operation Exceeding Permissible Time
Current Exceeding Rated Value and Duration Exceeding Equipment Tolerance Capacity (Based on Equipment Technical Specifications)
Abnormal System Voltage
Abnormal voltages that may lead to insulation breakdown, such as grid resonance or switching overvoltage.
IV. When Personal or Environmental Safety is Threatened
Emergency Situations such as Fire and Explosion
A fire, explosion, or other situation that may directly endanger equipment safety occurs in the area where the circuit breaker is located.
Risk of Electric Shock
When equipment casing is live, grounding faults are not eliminated, or other situations that may threaten personnel safety.
V. Special Fault Types
Failure to Operate or Malfunction
Failure to Open: The circuit breaker refuses to open during a fault, potentially escalating the accident.
Failure to Close: Unable to close and supply power normally.
Malfunction: Opens or closes on its own without instruction.
Burned-out opening/closing coils or control circuit malfunctions
resulting in the circuit breaker losing its normal operating capability.
Emergency Response Principles
Immediately Disconnect Power: Isolate the faulty circuit breaker via the upstream switch (such as a busbar circuit breaker, load switch, etc.).
Ensure Safety: Follow electrical safety regulations during operation, use insulated tools, and maintain a safe distance.
Record and Report: Record the fault symptoms and protection action information, and promptly report to the dispatch or management department.
Prohibit Blind Operation: Do not forcibly restore power before the cause is identified; inspection and handling must be carried out by qualified personnel.
Summary
The core principle of immediate power disconnection is: when a circuit breaker exhibits an anomaly that could directly lead to equipment damage, electrical fire, system accident, or personal injury, the fault point must be isolated immediately. Routine maintenance should incorporate equipment inspections, online monitoring, and preventative testing to identify potential hazards in advance and prevent emergencies from occurring.
Shaanxi Huadian vacuum circuit breakers utilize high-performance vacuum interrupters, achieving precise current cutoff at zero point within milliseconds of a fault occurring, resolutely preventing the escalation of the accident. The monitoring module senses temperature, mechanical characteristics, and vacuum level in real time, transforming potential risks into proactive warnings, turning the "immediate power cut" decision from reactive to proactive. With a fully sealed structure and long mechanical life design, even under frequent operation or harsh environments, it ensures accurate and powerful opening and closing, making it your most reliable "safety switch." For inquiries, please contact us.
Email:pannie@hdswitchgear.com.
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