Anti-overcurrent device

Abstract

The present invention belongs to the electrical equipment protection technical field and relates to an anti-overcurrent device. The anti-overcurrent device is characterized in that the anti-overcurrent device comprises a main body; an anti-overcurrent circuit is arranged in the main body; the anti-overcurrent circuit is connected with the power supply line of electrical equipment; the anti-overcurrent circuit comprises a first self-recovering fuse and a first varistor which are connected in parallel; the surface of the first varistor is provided with a first contact sheet; an auxiliary limiting mechanism is welded onto the first contact sheet; and the auxiliary limiting mechanism is used for cutting off the control circuit of the electrical equipment. The anti-overcurrent device of the invention has the advantages of scientific and reasonable design, simple structure, high safety and high reliability. With the anti-overcurrent device adopted, the problem of too high instantaneous current which often appears in the production process of existing small and medium-sized old factories can be solved.

Description

technical field [0001] The invention relates to the technical field of electrical equipment protection, in particular to an overcurrent prevention device. Background technique [0002] At present, there are many small and medium-sized old factories, due to the aging of some electrical circuits and equipment, and the failure to fully consider the increase in future production capacity in the design, and now the funds invested in the transformation are limited, it is difficult to comprehensively repair the electrical circuits and equipment of the factory. Due to upgrading and transformation, the phenomenon of sudden increase of current often occurs in the production process, but this sudden excessive current situation can be divided into two types: one is only instantaneous excessive current, which lasts for a very short time but recovers immediately This situation is most common in the current small and medium-sized old factories, most of which are due to the aging of lines a...

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Problems solved by technology

[0002] At present, there are many small and medium-sized old factories, due to the aging of some electrical circuits and equipment, and the failure to fully consider the increase in future production capacity in the design, and now the funds invested in the transformation are limited, it is difficult to comprehensively repair the electrical circuits and equipment of the factory. Due to upgrading and transformation, the phenomenon of sudden increase of current often occurs in the production process, but this sudden excessive current situation can be divided into two types: one is only instantaneous excessive current, which lasts for a very short time but recovers immediately It has become normal. This situation is most common in small and medium-sized old factories. Most of them are caused by the aging of lines and electrical equipment, and the unreasonable circuit design in the early stage. The other is that the overcurrent lasts for a long time, which is very It may be caused by more serious faults in lines and equipment, or by adding some new equipment to the original circuit.

[0003] At present, most small and medium-sized old factories are solving the above-mentioned overcurrent situation by installing a fuse on the power supply line. Although this method protects the electrical equipment, it frequently cuts off the power supply circuit. First, the production equipment such as Induced fans, temperature and pressure reducing valves, etc. often stop working midway, which affects production; second, electrical maintenance personnel often replace fuses, which wastes time and labor costs. Like the first overcurrent situation mentioned above, because the time for overcurrent Extremely short, in fact, it can be handled without power outage

A small number of small and medium-sized old factories install current monitoring equipment on key lines, and connect the current monitoring equipment to the control module at the same time. Once the current is detected to be too large, the control module will disconnect the power supply circuit, and then reconnect it after the current returns to normal. The disadvantage of this method is that the investment is relatively large, and the electrical equipment is also frequently started and stopped, resulting in higher production costs.

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