Guide: Circuit breakers , also known as interrupters, are an overcurrent protection device, but what are the main functions of circuit breakers ? Let's learn together!
1. The role of circuit breakers - Introduction
Circuit breaker (English name: circuit-breaker, circuit breaker) refers to the ability to close, carry and break the current under normal loop conditions, and can close and carry and break the current under abnormal loop conditions within the specified time. Switching device. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off circuits when they are severely overloaded or short-circuited or under-voltage faults. Their functions are equivalent to fuse switches. Combined with over-heat relays and the like. Moreover, it is generally not necessary to change parts after breaking the fault current. At present, it has been widely used. Circuit breakers are divided into high-voltage circuit breakers according to their use range, and low-voltage circuit breakers. The division of high and low voltage lines is relatively vague. Generally, 3kV or more is called high-voltage electrical equipment.
2. The role of the circuit breaker - structure
The circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a trip unit, a casing, and the like. When short-circuited, the magnetic field generated by the large current overcomes the reaction force spring, the trip unit pulls the operating mechanism, and the switch instantaneously trips. When overloaded, the current becomes larger, the heat is increased, and the bimetal is deformed to a certain extent to push the mechanism. Now there is an electronic type, using a transformer to collect the current of each phase, compared with the set value, when the current is abnormal, the microprocessor sends a signal, so that the electronic trip unit drives the operating mechanism.
3. The role of the circuit breaker - what are the defects?
Circuit breakers are mainly used in motors with frequent breaking loads and large-capacity transformers and substations. The circuit breaker has the function of breaking the accident load and cooperates with various relay protection to protect the electrical equipment or the line.
The circuit breaker is generally used in low-voltage lighting, the power part can play the role of automatically cutting off the circuit; the circuit breaker has many functions such as overload and short-circuit protection, but the load at the lower end is problematic and needs to be repaired. The role of the circuit breaker is not enough.
There is now a circuit breaker with isolation function that combines the functions of a common circuit breaker and an isolating switch. The circuit breaker with isolation function can also isolate the switch. In fact, the isolating switch can not be operated with load, but the circuit breaker has short circuit, overload protection, under voltage protection and so on.
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