Semi-controlled intelligent high-power arc-free DC bus contact device

Abstract

The invention provides a semi-controlled intelligent high-power arc-free DC bus contact device (DCS), which is characterized in that a controller A, a mechanical main switch (contact switch) K, a power electronic main switch (non-contact main switch) are provided. switch) T1 and its dynamic reverse bias control circuit, its dynamic reverse bias control circuit is composed of diode D, power electronic control switch (non-contact control switch) T2, voltage source E, capacitor C, K and T1 are connected in parallel DC switch dual channel, connected between the DC emergency power supply (E02) and the DC output load (OUT), through the intelligent control of A to ensure: when the emergency power supply is turned on, the non-contact switch channel is connected first and the mechanical switch channel is connected last. When exiting, the mechanical switch channel is broken first and the non-contact switch channel is then broken, so as to avoid arcing when the DC circuit is turned on and off under load, and through the timely conduction of T2 to solve the problem that the semi-controller T1 cannot turn off the DC under load.

Description

technical field [0001] This patent relates to the field of high-power DC switches, especially to the field of medium-voltage (U>500V) and high-voltage (U>1000V) high-power DC switches, and is mainly aimed at the anti-arc technology of high-power DC switches at the moment of on-off and half-controllers without DC on-load cut-off technology for contact switches. Background technique [0002] It is well known that the arc formed by various types of DC mechanical switches (contact switches) at the moment before the load is turned on and at the moment when the load is disconnected is the electric field formed by the voltage at both ends of the contact to break down the air (ionization) As a result, if there is no voltage at both ends of the contacts before and after they are turned on, there will be no arcing. In the various DC power supply systems that have emerged in recent years, there are more and more loads (such as subways, trams and trolleybuses, electric trains, in...

AI Technical Summary

Problems solved by technology

[0003] The problem solved by the present invention is to provide an arc-free high-power 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 provides a dynamic reverse bias circuit, so that the semi-controlled non-contact switch can turn off the DC, and also through intelligent control to ensure that the non-contact switch channel can only carry the load current independently at the moment of emergency DC power input or exit, and other times It does not carry current independently, and its basic structure is: a dual-channel DC emergency power output is composed of a mechanical switch (contact switch) and a power electronic switch (non-contact switch), which is connected to the DC emergency power supply E02 and the DC output bus M+ between

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