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The working principle of low voltage circuit breaker
PUBLISHER:Shanghai Moye Electric Co.,Ltd””RELEASE TIME:2017/7/13
Low-voltage circuit breakers, also known as automatic air switches, can be used to turn on and off the load circuit, can also be used to control the motor is not frequent start. It is equivalent to the knife switch, over-current relay, loss of stress relays, thermal relays and leakage protector and other electrical parts of the sum of all the functions of low-voltage distribution network is an important protection of electrical appliances.
Especially with the development of power system control digital application and the extensive application of power system automation, the requirements of system visualization, automation, network, real-time and precision are getting higher and higher, and the application area is wide, Network structure is complex, more frequent operation, high failure rate of low-voltage circuit breaker also put forward higher requirements, the traditional circuit breaker simply can not meet the needs of modern power system integrated automation. The application of intelligent technology has become an important development direction of low voltage circuit breakers.
Low-voltage circuit breakers with a variety of protection functions (overload, short circuit, under voltage protection, etc.), adjustable action value, breaking capacity, easy operation, security, etc., so now widely used.
Intelligent circuit breaker in the application of intelligent technology is the core of protection, measurement, monitoring in one of the multi-function release, which is mainly by the microprocessor unit, the signal detection acquisition unit, the switch input unit, display and keyboard unit, The implementation of the output unit, communication interface, power and other parts of the composition.
In general, the main contact is by manual operation or electric closing. When the main contact is closed, the free trip mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release and the power supply are connected in parallel. When the circuit short circuit or serious overload, the overcurrent release of the armature pull, so that the free trip mechanism, the main contact disconnect the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats the bimetallic sheet to bend and push the free trip mechanism. When the circuit is undervoltage, the armature of the undervoltage release is released. Also let the free trip mechanism action. Shunt release is used as a remote control, in normal operation, the coil is power, in the need for distance control, press the start button, the coil power, armature driven free trip mechanism, so that the main touch Point off.
Especially with the development of power system control digital application and the extensive application of power system automation, the requirements of system visualization, automation, network, real-time and precision are getting higher and higher, and the application area is wide, Network structure is complex, more frequent operation, high failure rate of low-voltage circuit breaker also put forward higher requirements, the traditional circuit breaker simply can not meet the needs of modern power system integrated automation. The application of intelligent technology has become an important development direction of low voltage circuit breakers.
Low-voltage circuit breakers with a variety of protection functions (overload, short circuit, under voltage protection, etc.), adjustable action value, breaking capacity, easy operation, security, etc., so now widely used.
Intelligent circuit breaker in the application of intelligent technology is the core of protection, measurement, monitoring in one of the multi-function release, which is mainly by the microprocessor unit, the signal detection acquisition unit, the switch input unit, display and keyboard unit, The implementation of the output unit, communication interface, power and other parts of the composition.
In general, the main contact is by manual operation or electric closing. When the main contact is closed, the free trip mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release and the power supply are connected in parallel. When the circuit short circuit or serious overload, the overcurrent release of the armature pull, so that the free trip mechanism, the main contact disconnect the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats the bimetallic sheet to bend and push the free trip mechanism. When the circuit is undervoltage, the armature of the undervoltage release is released. Also let the free trip mechanism action. Shunt release is used as a remote control, in normal operation, the coil is power, in the need for distance control, press the start button, the coil power, armature driven free trip mechanism, so that the main touch Point off.