Vacuum circuit breaker has a defined service life, which is influenced by both mechanical and electrical life, as follows:
Mechanical life
This is primarily determined by the number of opening and closing cycles of the contacts and vacuum tubes, typically 10,000 opening and closing cycles (i.e., 10,000 closings). Frequent operation causes contact wear and eventual failure.
Electrical life
Electrical life Affected by vacuum decay, when the vacuum drops to approximately 10⁻¹Pa, insulation performance degrades significantly, potentially shortening the service life. Taking into account a replacement margin, the estimated service life is up to 60 years.
Influencing factors
Vacuum aging: Degradation of seals (such as O-rings) can cause a decrease in vacuum, accelerating the aging of insulation components.
Operating Environment: Partial discharge accelerates insulation material degradation and shortens lifespan.
Maintenance Recommendations
Regularly check the vacuum level (if the initial value drops below 10⁻²Pa, attention is required). Combined with a comprehensive assessment of mechanical and electrical lifespans, replace the circuit breaker in advance if necessary.
Summary
The lifespan of a vacuum circuit breaker is typically 10,000 mechanical cycles, while the electrical life can reach several decades. The actual lifespan should be determined based on the operating environment and maintenance.
Shaanxi West Power Tongzhong Electrical Co., Ltd.
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Nanpo Village, Chencang Avenue Jintai District Baoji City, Shaanxi Province, China.
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