2012年12月28日
Low-voltage Circuit Breaker
Low-voltage circuit breakers, also known as automatic air switch can be used to load making and breaking circuit, and can also be used to control the frequent starting motor. It functional equivalent gate knife switch , over-current relay , loss of pressure relay, thermal relay and leakage protector electrical part or all of the functions of the sum, is an important protection of electrical low voltage distribution network.
With the wide application of power system control the development of the digital process applications and power system automation , visualization, automation, networking, real-time, precise requirements getting higher and higher, the corresponding application area wide, complex network structure, the operation is more frequent, the high failure rate of the low-voltage circuit breaker will put forward higher requirements, the traditional circuit breaker simply can not meet the needs of the modern power system automation. Intelligent technology applied is an important development in the application of a low-voltage circuit breakers direction.
The low-voltage circuit breaker has a variety of protection (overload, short-circuit, under-voltage protection, etc.), the action value adjustable, high breaking capacity, ease of operation, safety, etc., so widely used.
The core of the application of intelligent technology in intelligent circuit breaker is set in one multi-function trip protection, measurement, monitoring, and it is mainly by the microprocessor unit, signal detection, acquisition unit, switch input unit, display and keyboard unit perform output unit, communication interface, power supply, such as a few parts.
Generally, the main contact is by manual operation or an electric closing. The main contacts are closed, the free trip to the main contacts of the lock in the closing position. Overcurrent trip heating element in series with the primary circuit of the coil and the heat release, undervoltage release coil and power supply in parallel. Circuit short circuit or severe overload, over-current trip armature pull action of the free trip, main contacts disconnect the main circuit. When the circuit overload, the heating element of the thermal release fever bimetal bending action to promote free trip. When the circuit under-voltage, undervoltage release armature release. Also free tripping mechanism of action. Shunt release as a remote control, in normal operation, the coil is powered down, distance control is needed, press the start button, the coil is energized, the armature driven free trip action, the main touch point disconnected.
With the wide application of power system control the development of the digital process applications and power system automation , visualization, automation, networking, real-time, precise requirements getting higher and higher, the corresponding application area wide, complex network structure, the operation is more frequent, the high failure rate of the low-voltage circuit breaker will put forward higher requirements, the traditional circuit breaker simply can not meet the needs of the modern power system automation. Intelligent technology applied is an important development in the application of a low-voltage circuit breakers direction.
The low-voltage circuit breaker has a variety of protection (overload, short-circuit, under-voltage protection, etc.), the action value adjustable, high breaking capacity, ease of operation, safety, etc., so widely used.
The core of the application of intelligent technology in intelligent circuit breaker is set in one multi-function trip protection, measurement, monitoring, and it is mainly by the microprocessor unit, signal detection, acquisition unit, switch input unit, display and keyboard unit perform output unit, communication interface, power supply, such as a few parts.
Generally, the main contact is by manual operation or an electric closing. The main contacts are closed, the free trip to the main contacts of the lock in the closing position. Overcurrent trip heating element in series with the primary circuit of the coil and the heat release, undervoltage release coil and power supply in parallel. Circuit short circuit or severe overload, over-current trip armature pull action of the free trip, main contacts disconnect the main circuit. When the circuit overload, the heating element of the thermal release fever bimetal bending action to promote free trip. When the circuit under-voltage, undervoltage release armature release. Also free tripping mechanism of action. Shunt release as a remote control, in normal operation, the coil is powered down, distance control is needed, press the start button, the coil is energized, the armature driven free trip action, the main touch point disconnected.
Posted by novaking at
10:37
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