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Direct-current switching device

A DC switch and switching technology, applied in the field of DC switch devices, can solve the problem of high cost, and achieve the effects of low cost, high versatility and fast breaking speed

Active Publication Date: 2020-09-08
XUJI GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If controllable electronic components are used to control the oscillating current bidirectionally, it will lead to higher costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0026] According to the first embodiment of the present invention, a DC switching device with controllable oscillating current in the transfer branch such as figure 1 shown. A DC switching device includes a first switch 1, a second switch 2, a bidirectional controllable switch module 3, a first lightning arrester 4, a capacitor 5, a resistor 6, a second lightning arrester 7, a third switch 8 and a fourth switch 9 . The second switch 2 is connected in parallel with the bidirectional controllable switch module 3, and then connected in series with the first switch 1 to form the main flow branch of the DC switch device; the first lightning arrester 4, the capacitor 5 and the resistor 6 are connected in series to form a DC switch In the transfer branch of the device, the two ends of the transfer branch are respectively connected in parallel to the two ends of the main flow branch through the third switch 8 and the fourth switch 9 connected in series. The second lightning arrester...

no. 2 example

[0032] According to the second embodiment of the present invention, a DC switching device with controllable oscillating current in the transfer branch such as figure 2 shown. figure 2 neutralize figure 1 The same parts are denoted by the same reference numerals, the only difference is that figure 2 The middle and two-way full-control switch module adopts a bridge-type switch module composed of 1 controllable electronic component and 4 power diodes, which is connected in parallel with the third lightning arrester. The operation sequence of opening, closing and reclosing of the second embodiment is basically the same as that of the first embodiment, and will not be repeated here.

no. 3 example

[0034] According to the third embodiment of the present invention, a DC switching device with controllable oscillating current in the transfer branch such as image 3 shown. image 3 neutralize figure 1 The same parts in are represented by the same reference numerals, the difference is that image 3 The energy storage module of the middle transfer branch is composed of the fifth switch 10 and the resistor 6 connected in parallel with the capacitor 5 , and the energy storage auxiliary module of the transfer branch is composed of an inductor 11 .

[0035] Before the closing operation, the fifth switch 10 is turned on by the controller, the capacitor 5 quickly discharges the resistor 6 through the fifth switch 10 , and then the fifth switch 10 is turned off. During the opening operation, when the capacitor 5 is charged, the inductor 11 acts as a current limiter. During the reclosing operation, if the fault circuit is not closed, the main flow branch directly carries the rated ...

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Abstract

The invention discloses a direct-current switching device, which comprises a main circulation branch, a transfer branch and an energy consumption branch, and is characterized in that the main circulation branch is mainly formed by connecting two switches in series, and one switch is connected with a controllable switch module in parallel; the transfer branch is mainly formed by connecting an energy storage module, an energy storage auxiliary module and a lightning arrester in series. The transfer branch is connected to the two ends of the main circulation branch in parallel through switches connected in series. The energy consumption branch is composed of lightning arresters and connected to the two ends of the transfer branch in parallel. The direct-current switching device has the advantages of high universality, low cost and high on-off speed.

Description

technical field [0001] The present invention relates to the field of direct current power transmission and distribution, in particular to a direct current switchgear. Background technique [0002] Due to changes in power production, transmission, and consumption structures, flexible DC systems have become an important development direction of power systems, and DC switchgear plays a key role in the field of power transmission and distribution of flexible DC systems. [0003] Current DC switching devices using capacitors for current transfer have the problem of uncontrollable oscillating current. If controllable electronic components are used to control the oscillating current bidirectionally, the cost will be higher. Therefore, it is necessary to invent a DC switching device with controllable oscillating current in the transfer branch and low cost. Contents of the invention [0004] (1) Purpose of the invention [0005] The purpose of the present invention is to propose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/54H02H7/26H02J1/00
CPCH01H9/54H01H9/542H01H9/547H01H9/548H02J1/00H02H7/268H01H2009/543H01H2009/544Y02E60/60
Inventor 李瑞生纪江辉李猛张杰张玉婵孙广涛王其中曹善军喻会永
Owner XUJI GRP
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