Single-coil shunt release

Abstract

The invention discloses a single-coil shunt release. The single-coil shunt release comprises an EMC (electro-magnetic compatibility) filtering circuit, a rectifying circuit, a sampling circuit, a PWM (pulse-width modulation) circuit, an integrated circuit, a switch circuit, a comparison circuit, a door pin circuit, a differentiating circuit, a power circuit and a single-coil shunt electromagnet, wherein the EMC filtering circuit is used for restraining interference signals generated from a power grid and an internal circuit in two ways; and the single-coil shunt electromagnet comprises a coil winding and a movable iron core. By the single-coil shunt release, releasing actions do not exist when the voltage of the power grid is lower than nominal voltage by 70%, high-reliability releasing can be guaranteed when the voltage of the power grid is higher than the nominal voltage by 70%, after the single-coil shunt release is released, the releasing state of the single-coil shunt release is always maintained until the voltage of the power grid is removed or is reduced to be below 30%, and possibility of reclosure is stopped effectively. During releasing of the single-coil shunt release, reliable shunt releasing can be implemented by the electromagnet through the maximum power, and the conduction time is quite short; and after releasing of the single-coil shunt release, a small power is applied to the electromagnet so as to maintain the releasing state, heating and overturning of the electromagnet can be avoided effectively, and the electromagnet can also be in a powered-on state for a long time.

Description

technical field [0001] The invention relates to a low-voltage circuit breaker tripping technology, in particular to a single-coil shunt tripper. Background technique [0002] The shunt release is an accessory for remote control and opening. According to GB14148.1-2006 "General Rules for Low-Voltage Switchgear and Control Equipment" and GB14048.2-2008 "Low-Voltage Switchgear and Control Equipment Part 2: Circuit Breakers "Stipulates that when the power supply voltage of the shunt release (measured during the tripping action) is maintained between 70% and 110% of the rated grid voltage, the shunt release should be tripped under all operating conditions of the electrical appliance. button to disconnect the appliance. Referring to the above general principles, it is required that the shunt release can operate reliably when the applied power supply voltage is between 70% and 110% of the rated voltage. When the applied power supply voltage is lower than 70% of the rated voltage,...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problem that the existing shunt release is easy to be burnt because the electromagnet coil cannot be powered off due to the failure of the on-off contact, and the general circuit cannot be maintained after the control circuit breaker is opened. "Shunt state", possible reclosing problem

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