Electronic fuse device of realizing real physical properties of fuse by adopting simulation method

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 low-voltage power supply and distribution systems. Background technique [0002] With the development of the economy and the improvement of people's living standards, the electricity consumption in cities has increased significantly. At present, there are more and more outdoor pole-mounted transformer installations in the urban 10kV distribution network, and the consumption of matching 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 outdoor pole transformer device of the low-voltage power distribution network. It is installed between the low-voltage end of the transformer and the low-voltage power grid. Operate its "open" and "close" to realize the input and cut-off operation of the low-voltage pow...

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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