Short-circuit protection device for switching device

Abstract

The invention relates to a short-circuit protection device for a switching device, belonging to the technical field of power distribution. The short-circuit protection device comprises a protection device body which is internally provided with a signal sampling input module. The short-circuit protection device is characterized in that an output end of the signal sampling input module is connectedinto an input end of a release driving module through a micro-processing module; an input end of the signal sampling input module is connected with an output end of a current signal amplifying device; the output end of the current signal amplifying device is respectively connected into input ends of a data conversion device and a comparison unit; output ends of the data conversion device and the comparison unit are connected into an input end of a microprocessor; and an output end of the microprocessor is connected with the input end of the release driving module. Therefore, the short-circuitprotection device has the advantages of compact overall design, concise signal transmission mode among the devices, good action reliability, strong anti-interference ability, high reliability, and being capable of accurately judging and handling signals at the first time.

Description

Technical field [0001] The invention relates to a protection device, in particular to a short-circuit protection device of a switching electrical appliance, and belongs to the technical field of power distribution. Background technique [0002] From the perspective of existing technology applications, the control and protection switches in electrical appliances need to integrate circuit breakers, contactors, thermal relays, isolators, leakage protectors, undervoltage protection relays, starters, time relays, transmitters, and measuring mutual inductances. The functions of the various separate components such as the power supply unit are well integrated, and strive to match the protection and control characteristics of each discrete component. [0003] However, because of this, the existing electrical short-circuit protection device has a complex structure, and when an abnormality occurs, it is often impossible to correctly determine whether the current state is a fault or an interf...

AI Technical Summary

Problems solved by technology

[0003] But because of this, the existing electrical short-circuit protection device has a complex structure, and it is often impossible to correctly judge whether the current state is a fault or an interference when an abnormality occurs.

Often lead to mishandling, faulty short circuits or damage to electrical appliances

At the same time, the judgment process often needs to rely on an external short-circuit detection module, which increases time-consuming

Therefore, the existing protection switch cannot realize a fast and correct judgment, and cannot be popularized and applied in a wide range of fields.

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