An electronic fuse device that uses simulation to realize the real physical characteristics of the fuse

Abstract

The invention provides an electronic fuse device of realizing real physical properties of a fuse by adopting a simulation method, and belongs to the field of emergency protection devices. The electronic fuse device comprises a mutual inductor group, a circuit breaker switch and a control unit which are arranged in a box body, wherein the control unit performs tripping operation control on the circuit breaker switch through comparing load current value of each phase in a major loop with the fuse inverse-time characteristic curve and the fuse heat-capacity characteristic time or the total heat capacity cooling time. Through simulating the inverse-time characteristic and the heat-capacity time characteristic of fuses in various specifications, tripping or closing operation of the circuit breaker switch is controlled, so that the electronic fuse device can realize the actual circuit protection function of the fuses, overcome the defects that a fuse tablet is hot and high in temperature in the load peak, and an insulator material can be in aging and effectiveness-losing easily under the cold and hot alternative action, and be suitable for power supply circuits with different specifications of fuses, so as to reduce purchase and storage amount of fuse products, reduce the comprehensive operation cost, and meet operation needs of the smart power grid. The electronic fuse device can be widely applied to the field of intelligent control of low-voltage power distribution systems.

Description

technical field [0001] The invention belongs to the field of emergency protection circuit devices, in particular to an emergency protection circuit device used in a low-voltage power supply and distribution system. Background technique [0002] With the economic development and the improvement of people's living standards, the urban electricity consumption has increased significantly. At present, there are more and more transformer devices on the outdoor poles of the urban 10kV distribution network, and the use of the matching distribution transformer fuse boxes is also increasing year by year. Increase. [0003] The low-voltage distribution transformer fuse box is one of the important equipment in the low-voltage distribution grid outdoor pole transformer device. It is installed between the low-voltage end of the transformer and the low-voltage grid. It can not only be used as a protection device for short-circuit and overload of the low-voltage grid, but also through the ...

AI Technical Summary

Problems solved by technology

The traditional mechanical distribution transformer fuse box cannot meet the informationization and automation requirements of the smart grid for the distribution network. If it is not improved, it will continue to operate in the smart distribution network. Automatic operation and other automation performance, there are hidden dangers to the stability of the smart grid, which will seriously hinder the process of intelligentization of the low-voltage transmission system

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