Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic

Abstract

An electronic type low-pressure distribution transformer fuse case provided with an inverse-time characteristic belongs to the field of emergent protection devices, and comprises a circuit overload protection module arranged in a case body, wherein the circuit overload protection module comprises a mutual inductor group, circuit breaker switches and a control unit; the mutual inductor group is connected in series with a three-phase major loop, is used for measuring the load current values of various phases of the major loop in a real-time manner and sending the measured result to the control unit; the circuit breaker switches are used for switching on / off a three-phase circuit of the major loop under the control of the control unit; the control unit compares the absolute values of the load current values of the various phases of the major loop or the variation trend of the load current of the various phases with an inverse-time characteristic curve, performs the 'trip' operation control for the circuit breaker switches, and remotely transmits the circuit load current and the states of the circuit breaker switches to a host computer in a digital signal form. According to the invention, the fuse case realizes the intelligent upgrade of products, meets the operation requirements of an intelligent power grid, and can be widely applied to the field of the intelligent control of a low-pressure power transformation and distribution system.

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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