Electromagnet fault detection method and circuit, control method and circuit and circuit breaker

Abstract

The invention discloses an electromagnet fault detection method and belongs to the low-voltage electrical technology field. The electromagnet fault detection method comprises judging whether an electromagnet breaks down or not according to the current change condition in an electromagnet power supply loop after starting of electrification and judging the electromagnet breaks down if currents do not decrease during a process that currents change from zero to a stable value. The invention also discloses an electromagnet fault detection circuit and an electromagnet fault control method and control circuit and a circuit breaker. According to the electromagnet fault detection method, the information that whether the electromagnet rightly acts or not is rightly judged through a circuit according to the current change rule of the power supply loop during the electromagnet actin process and an output signal is provided to clearly prompt the exterior whether the electromagnet rightly acts or not, convenience is brought for maintenance, warning and control, and the electromagnet fault detection method can be widely applied to various occasions using the electromagnet to drive an execution mechanism to act.

Description

technical field [0001] The invention relates to an electromagnet fault detection method, which belongs to the technical field of low-voltage electrics. Background technique [0002] At present, the electric control of circuit breakers mostly uses electromagnet devices to perform actions, such as closing and opening operating mechanisms. [0003] Most of the current electromagnets are single-control open-loop circuits. The control circuit issues an action command to the electromagnet, that is, after passing the required control voltage to the electromagnet, the control of the electromagnet is completed. [0004] In this control mode, if the electromagnet fails and cannot operate correctly, the control device will not be able to obtain the information that the electromagnet is not operating. In this case, when the electromagnet action command is issued, if the actuator struck by the electromagnet does not move, it will not be possible to judge whether the actuator does not ac...

AI Technical Summary

Problems solved by technology

This method needs to increase the conversion mechanical structure of the micro switch, which is complicated in structure, high in cost and low in reliability.

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