Composite intelligent high-power arc-free DC bus contact device

Abstract

The invention provides a composite intelligent high power arc-free direct current bus contact device (DCS). The direct current bus contact device is characterized by comprising a controller A, a mechanical switch (contact switch) K channel, an electric electronic main switch (non-contact switch) T1 channel and a dynamic reverse bias circuit; by utilizing the advantages of arc free of on-off circuits of the non-contact switch, the non-contact main switch T1 channel is conducted firstly and the mechanical switch K channel is conducted successively when in loaded conduction; the mechanical switch K channel is broken firstly and the non-contact main switch T1 channel is broken successively when in loaded break, in this way, the arc danger of switch K loaded on-off current is avoided; the dynamic reverse bias circuit comprises a dioxide D, an electric electronic switch (non-contact control switch) T2, a voltage source E and a capacitor C, and is used for turning off T1 compulsively according to the instruction of the controller A.

Description

technical field [0001] This patent relates to the field of high-power DC switches, especially the field of medium-voltage (U>500V) and high-voltage (U>1000V) high-power DC switches. DC load cut-off technology of contact switch. Background technique [0002] As we all know: the arcs formed by all kinds of DC mechanical switches (contact switches) at the moment before the load is turned on and the moment just after the load is disconnected are the electric fields formed by the voltage at both ends of the contacts to break down the air (ionization) As a result, if there is no voltage across the contacts at the moment before turning on and after turning off, no arc will occur. In the various types of DC power supply systems that have emerged in recent years, there are more and more loads (such as subways, trams and trolleybuses, electric trains, inverters for emergency power supplies, etc.) that do not allow interruption of DC power supply during operation. Under normal ...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide an intelligent high-power arc-free DC bus bar contact device for the arc extinguishing problem existing in the on-load switching of high-power DC circuits, and to solve the problem that the semi-controlled non-contact switch cannot shut off the DC The problem is to provide a dynamic reverse bias circuit, so that the semi-controlled non-contact switch can turn off the DC, and also through the control of the controller to ensure that the non-contact switch channel can only carry the load current when the emergency DC power supply is put in or out. It does not carry electricity at other times, and its basic structure is: a dual-channel structure of DC emergency power output consisting of a mechanical switch (contact switch) channel and a power electronic switch (non-contact switch) channel, connected to the DC emergency power supply E02 and DC Between output bus M+

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