Alternating current shunt tripper suitable for working with alternating current relay in series

Abstract

The invention relates to an alternating current shunt tripper suitable for working with an alternating current relay in series. The alternating current shunt tripper suitable for working with the alternating current relay in series comprises a rectification circuit, a driving circuit, a shunt electromagnet coil, a load capacitor, a strong load circuit sampling circuit and a MCU (Microprogrammed Control Unit) circuit, wherein the load capacitor is connected with an alternating current access end of the rectification circuit in parallel; the input impendence of the alternating current shunt tripper is not more than 1 / 10 of the impendence of the alternating current immediate relay; a positive output end of the rectification circuit is respectively connected with voltage input ends of the strong load circuit and the sampling circuit as well as one end of the shunt electromagnet coil; a negative output end of the rectification circuit is respectively connected with grounding ends of the strong load circuit, the sampling circuit, the MCU circuit and the driving circuit. According to the invention, the alternating current shunt tripper can work with the alternating current immediate relay in series so that the reliable working voltage is guaranteed for the series-connected alternating current relays; moreover, the shunt electromagnet can be started to work at an alternating current zero-crossing point so that the reliability of the shunt tripper is improved and the interference to the power grid is avoided.

Description

technical field [0001] The invention relates to an AC shunt tripper suitable for working in series with an AC relay. 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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