In the safe operation of power systems, molded case circuit breakers play a vital role. Through time, they block off aberrant currents to shield circuits from damage. Still, good maintenance and care are inseparable with the effective functioning of molded case circuit breakers. The maintenance techniques of molded case circuit breakers in various conditions will be discussed in this paper together with a set of maintenance points to guarantee that they will always be able to deliver protective functions reliably, so maintaining the dependability and safety of the whole power system.
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1. ambient humidity and temperature:
Install molded case circuit breakers in an area where the average temperature within 24 hours does not exceed +35℃ and the maximum limit of the ambient air temperature does not exceed +70℃ and the lower limit does not exceed -35℃. Furthermore, at a temperature of +40℃ the relative humidity of the air should not be more than 50%; at lower temperatures, say +20℃, the relative humidity should not be more than 90%. Special protective measures should be taken for condensation occasionally generated due to temperature changes.
2. Cleanliness and dust prevention:
Maintaining the surface of the circuit breaker free from dust and humidity is rather vital. The insulating effectiveness of the circuit breaker and even the explosion of the arc chamber could be influenced by humid air or dust. Thus, a major component of maintenance is consistent cleaning of the circuit breaker surface to guarantee that it is free of dust and humidity.
3. Check and maintain rubber accessories:
Rubber accessories are important sealing components in circuit breakers and should be checked and replaced regularly. Ensuring the performance of circuit breakers depends mostly on timely replacement of rubber parts due to their complicated structure and stringent sealing performance criteria.
4. Check electrical connections:
Regularly check whether the wiring terminal connections of the circuit breaker are firm and ensure that there is no looseness. Tightening the wire terminal in line with the prescribed torque will help to prevent failures brought on by inadequate contact.
5. Check the operating mechanism:
The operating mechanism of the circuit breaker should be flexible and reliable. To guarantee that the handle operates naturally and without jamming, routinely inspect the closing and opening actions of it.
6. Moisture and corrosion resistance:
In a humid or corrosive gas environment, the insulation performance of the molded case circuit breaker may be affected. Make that the circuit breaker is installed in a medium free of explosion risk and that the medium lacks gas and dust sufficient to corrode metal and compromise insulation.
7. Regular testing and inspection:
Use a thermometer to measure the temperature of the terminal and the wire connection part regularly. Normal conditions should see it not more than 50 degrees above room temperature. Should it be more than, see whether the connection is loose. Press the test button once a month to find whether the leakage action of leakage circuit breakers is normal.
8. Avoid frequent starting and impact:
Molded case circuit breakers are not suitable for special occasions such as motors, electric heating equipment, capacitor cabinets, high inductive or high capacitive loads and high temperature environments that are frequently started. These factors could hasten the aging and circuit breaker damage.
9. Check and replace nonlinear resistors:
The nonlinear resistor needs to be checked for cleanliness, and the desiccant inside needs to be replaced regularly, while measuring the nonlinear chip resistance.
10. Check the drive cylinder:
The drive cylinder needs to check its buffer, ensure its isolation switch, and check its accuracy in time. Maintenance and replacement allow one to keep its performance.
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Long-term steady performance of molded case circuit breakers depends mostly on maintenance and care. By means of consistent inspection and maintenance, possible issues can be found and resolved over time, therefore preventing circuit breaker failures and hence avoiding power system interruptions. Whether in residential, commercial or industrial environments, following the above maintenance and care points can significantly improve the reliability and service life of molded case circuit breakers.
Post time: 7 月-19-2024