Implementation method for reducing short circuit protection time of electromagnetic release

Abstract

The invention relates to a method for shortening the short-circuit protection time of an electromagnetic tripper. The tripper protection unit includes a U-shaped iron core, an auxiliary tripping coil, an armature, a tripping rod, a heating element, a bimetallic sheet and an auxiliary tripping unit. Coil power supply circuit. It is characterized in that the traditional iron core is changed from low-carbon steel material to silicon steel sheet material, the magnetic field force generated by the U-shaped iron core is increased, the armature pulls in faster, and the short-circuit instantaneous protection time is shortened; the U-shaped iron core is equipped with auxiliary tripping The coil shortens the protection time when there is a lot of undervoltage in the short circuit state, offsets part of the magnetic field force when overloaded, and maintains the overload protection characteristics. When the circuit is short-circuited, the U-shaped iron core generates a huge magnetic field force to attract the armature, so that the trip lever operates to disconnect the circuit. The invention can effectively shorten the short-circuit instantaneous protection time of the electromagnetic tripper, and when a large-current short circuit occurs in the circuit, the tripping mechanism will act before the phase is missing, and the circuit can be cut off more reliably and quickly.

Description

technical field [0001] The invention relates to a realization method for shortening the short-circuit protection time of an electromagnetic tripper. Background technique [0002] The circuit breaker is a terminal protection device widely used in electrical terminal power distribution devices. The short-circuit instantaneous tripping capability of the circuit breaker is a key performance indicator, which can ensure that the circuit is quickly protected when a short circuit occurs in the circuit without affecting other equipment. When a short circuit occurs in the circuit, if the circuit breaker does not trip in time, that is, the short circuit cannot be cut off before the phase is lost, it will cause voltage loss in other bus distribution circuits and affect the normal operation of other equipment. The release is the core component of the circuit breaker. At present, the iron core inside the traditional electromagnetic release of the circuit breaker is usually made of low-car...

AI Technical Summary

Problems solved by technology

When a short circuit occurs in the circuit, if the circuit breaker does not trip in time, that is, the short circuit cannot be cut off before the phase is lost, it will cause voltage loss in other bus distribution circuits and affect the normal operation of other equipment

The release is the core component of the circuit breaker. At present, the iron core inside the traditional electromagnetic release of the circuit breaker is usually made of low-carbon steel material, and the magnetic permeability is small, which causes the short-circuit instantaneous tripping of the circuit breaker to be slow. In some special Can not protect the circuit well in the power distribution environment

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