DC circuit breaker can be used to distribute electric energy, do not frequently start asynchronous motor, power line and motor protection, in normal circumstances on and off the circuit, but also can be used to remove the short circuit fault current, that is to say, it bears the dual task of control and protection. But in recent years, the occurrence of circuit breaker accidents together, the common circuit breaker failure, overheating, noise is too large, serious and sudden combustion and explosion of circuit breaker accidents. The following Xiaobian for you to summarize the causes of the explosion accident and the corresponding solutions, must see.
DC circuit breaker installation before strict inspection of its performance indicators should meet the technical requirements. Because if the maintenance quality does not meet the requirements. Such as the maintenance of random change in the opening, closing speed, random change of the arc distance of the circuit breaker, will reduce the capacity of the circuit breaker. If the breaker’s interrupting capacity is too small; When a short circuit occurs, the circuit breaker cannot cut off the short circuit current, causing the circuit breaker to explode and fire.
Improper operation and maintenance. After the DC circuit breaker has cut off the short circuit current for many times, if it is not timely arranged for maintenance, it will send power for many times, so that the circuit breaker will be impacted by the short circuit current for many times. All of these reduce the breaker’s interrupting capacity, and thus cause the breaker to explode and fire. Therefore, it is necessary to strengthen operation, maintenance and management. When the circuit breaker is in operation, it is necessary to do a good job of inspection and make statistics of the normal operation and fault trip times of the circuit breaker, so as to arrange the maintenance time.
Insulating oil is not pure. Circuit breaker oil a large number of free carbonization, a large number of aging, oil into the tide, water, resulting in oil impure, will make the circuit breaker internal flashover and lead to explosion. This requires regular insulation tests. Especially preventive tests before the thunderstorm season.
In addition, we should do more regular maintenance to ensure the quality of maintenance. Do a good job of moisture-proof, leak-proof and pollution-proof for DC circuit breaker to prevent the circuit breaker from entering water and being affected by moisture. For these electrical devices, such as contactors, it is important to choose quality products, but maintenance and crisis prevention during operation are more important.
