Zero-voltage delay release

Abstract

The invention relates to the field of releases, in particular to a zero-voltage delay release, which comprises a filter circuit, a starting power circuit, an electromagnet for releasing control, a switching circuit, a delay circuit for controlling delay releasing, a control circuit for controlling the turn-on / off of the switching circuit, and a regulated power circuit for supplying power to the switching circuit and the control circuit, wherein the power input end of the filter circuit is connected with a power grid, and the power output end of the filter circuit is connected with the power input end of the starting power circuit; and the power output end of the starting power circuit, the switching circuit and a coil of the electromagnet form a series loop. The zero-voltage delay release is simple in circuit, high in starting torque, reliable in closing, low in coil heat and high in charging speed; and after zero voltage, the power of the coil (the retention of an armature) is maintained to be constant, and delay time is long.

Description

technical field [0001] The invention relates to the field of releases, in particular to a zero-voltage time-delay release. Background technique [0002] The undervoltage release is the core component of the low-voltage switch. There are two types of working methods for the undervoltage release to drive the ejector rod: electromagnetic type and permanent magnet type. Compared with the permanent magnet undervoltage release, the electromagnetic undervoltage release has a simple circuit. After the power is cut off, the ejector rod has the ability of "self-resetting" under the action of the spring force. However, existing electromagnetic undervoltage releases generally have problems such as high coil heat generation, low starting torque of the undervoltage release, or too complicated circuits. [0003] According to GB14148.1-2006 "General Rules for Low-Voltage Switchgear and Control Equipment", the action range of the undervoltage release is 35% to 70% of the rated voltage, and ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the prior art, in order to realize the delay tripping after zero voltage (loss of voltage), by increasing the circuit and changing the control mode, the coil of the electromagnetic undervoltage release will be solved when it is working normally. The invention provides a simple circuit, large starting torque, reliable pull-in, small coil heat generation, fast charging speed, and maintenance after zero voltage. Zero-voltage time-delay release with constant coil power (armature holding force), minimum backup charging capacity or longest delay time

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