Introduction Overheating of a motor due to an abnormal use shortens considerably the life time of its components and causes short-cuts. Overloads are tolerated only for a limited period of time. Concerning short-cuts, their effects are destructive and they must be quickly cut off. Fault types Internal Faults That type of internal faults generally appears when insulating components areageing. It is then preferable to release the protection as fast as possible. Those faults can be detected by comparing the ongoing and outgoing currents of the same phase. The protection is then provided by an percentage differential overcurrent relay connected to two sets of three current transformers placed on each input and output phases of the stator. Because of the imprecision linked to the TC, the fault current
Tag: circuit breaker
MCB vs MCCB
What are the differences between MCB and MCCB? These two circuit breakers serve a common purpose, to automatically open the circuit during short circuit fault. This article will tackle more about their differences in terms of construction and application. MCB MCB or Miniature Circuit Breaker. It’s a protective device that automatically cut off the power during abnormal conditions such as short circuit, over current and overload. It has a bimetallic strip that will react based on current passing through the circuit and will bend as current rises. It’s attached to a mechanical mechanism that will cause the breaker to trip. ABB 2-Pole MCB In industrial application, this type of breaker is commonly used for control circuits and small utility loads such as Air-conditioning unit, lighting, etc. It’s also commonly used for residential applications as