Air Circuit Breakers | Maintenance Schedules and Procedures

Air circuit breakers are an essential part of any electrical system, protecting it from overcurrents and short circuits. Instead of insulating oils or gasses, these specialized breakers use compressed air to extinguish the arc formed during operation. 

While robust, ACBs do require routine maintenance to ensure their safe and reliable performance over time. Sticking to the recommended maintenance schedules and procedures is absolutely critical!

Maintenance of Air Circuit Breakers – Step-by-Step Guide

Follow the following step-by-step guide to ensure the longevity and optimal performance of ACBs:

1. The Inspection Process

Before any maintenance work can begin,full electrical lockout/tagout proves mandatory – completely de-energizing then isolating the system to enable safe human access. 

With power definitively secured, meticulous visual examination identifies developing faults which could compromise operational integrity if left unaddressed. During rigorous inspections, qualified personnel hunt for any evidence of deterioration including wear, tears, corrosion, or missing components. 

Technicians cannot dismiss even subtle defects as these may still impede future tripping functionality. Any problems discovered require prompt remediation via repair or replacement parts to uphold ACB protection capabilities.

2. Cleaning Process

After the initial inspection, it’s time for a deep cleaning of the ACB components. 

The main contacts that control current flow require meticulous cleaning using specialized materials like silver cleaner or alcohol applied with non-abrasive cloths. Any debris left behind can increase electrical resistance and cause overheating during operation – a serious hazard. 

The arc chutes that cool and extinguish the arc also demand thorough cleaning to remove any built-up dirt or moisture. A light sanding may be needed, but abrasive tools should be avoided to prevent contamination from conductive residues. Proper functioning of these chutes is crucial, as a failure could destroy the entire breaker.

The operating mechanisms made up of the device and chassis components must also be thoroughly cleaned of any grime. And proper lubrication as per the manufacturer’s specs is a must, as too little or too much can severely impact the breaker’s lifespan.

3. The Air System

Due to their unique compressed air design, ACBs have some additional maintenance requirements. Any air leaks throughout the system have to be identified and sealed to maintain proper breaker function. The grading capacitors need monthly checks for oil leaks. And the dew point of the operating air coming from the air dryer outlet must be regularly measured and kept within defined limits.

4. Test, Test, and Test Again

After the intensive inspection and cleaning phases, it’s time to put the ACB through its paces with a battery of tests. The operating mechanisms are exercised to verify smooth operation. 

Insulation resistance tests check for any weaknesses or contamination in the insulation. But most crucially, overcurrent and instantaneous tripping tests validate the breaker’s ability to rapidly interrupt fault currents as designed. 

Even the slightest deviation from expected performance points to underlying issues requiring further investigation and resolution.

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Conclusion

Keeping up with the recommended maintenance schedules and following the proper procedures to the letter is the only way to ensure air circuit breakers continue delivering the protection and performance facilities depend on. It’s an essential investment in operational safety, equipment longevity and overall system resilience over the long haul.

If you are looking for industrial-grade ACBs for your facility, partner up with iALLway today to find the best option for your needs!