Method for tandem operation of alternating current shunt release and alternating current relay

Abstract

The invention relates to a method for the tandem operation of an alternating current shunt release and an alternating current relay. The method comprises the following steps that: when a button switch connected in parallel with the intermediate alternating current relay is turned on, a sampling circuit samples one-way pulsating direct current voltage generated by a rectifier circuit, and a micro controller unit (MCU) circuit acquires sampling voltage Vsa and a zero-crossing pulse signal SI obtained by the sampling circuit, and judges whether the one-way pulsating direct current voltage reaches 60 percent of a rated voltage value Ue for the operation of a shunt electromagnet coil or not; and if the one-way pulsating direct current voltage reaches 60 percent of the rated voltage value Ue for the operation of the shunt electromagnet coil, the MCU circuit outputs a control signal to turn off a high-load circuit to quickly increase a value of the one-way pulsating direct current voltage, and generates a single pulse signal with the duration of 50 to 60ms in the zero-crossing of the one-way pulsating direct current voltage, and the single pulse signal controls the electrical conduction of the shunt electromagnet coil after being amplified by a driving circuit to make an armature in the alternating current shunt release work and realize opening operation.

Description

technical field [0001] The invention relates to a method for an AC shunt release and an AC relay to work in series. Background technique [0002] The shunt release is used to receive the remote control voltage and is the core component to realize the "remote control" opening of the low-voltage circuit breaker. For example, in civil buildings where fire protection requires a power outage circuit, a circuit breaker with a shunt release can be selected. The fire alarm system can remotely control the opening of the circuit breaker through modules or cables in the fire center. [0003] Existing AC shunt releases are all short-time working systems, and cannot be connected (operated) to the power supply for a long time, and the power-on time generally cannot exceed 1 second, otherwise the coil in the shunt electromagnet coil is easily burned; in addition, if The AC relay is connected in series with the AC shunt release, and the voltage obtained by the AC intermediate relay is too ...

AI Technical Summary

Problems solved by technology

[0003] Existing AC shunt releases are all short-time working systems, and cannot be connected (operated) to the power supply for a long time, and the power-on time generally cannot exceed 1 second, otherwise the coil in the shunt electromagnet coil is easily burned; in addition, if The AC relay is connected in series with the AC shunt release, and the voltage obtained by the AC intermediate relay is too low to work normally due to the series voltage division of the AC relay, so the AC shunt release cannot work in series with the AC relay

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