Direct current breaker based on vacuum magnetic blowout transfer and breaking method thereof

Patent metadata

Field	Value
Publication number	US-11152171-B2
Application number	US-201916712720-A
Country	US
Kind code	B2
Filing date	Dec 12, 2019
Priority date	Apr 23, 2019
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

There is provided a direct current breaker based on vacuum magnetic blowout transfer and a breaking method thereof. The direct current breaker includes a first connection terminal, a second connection terminal, a main current branch, a transfer branch, an energy dissipation branch and a blowout unit. The main current branch is connected between the first connection terminal and the second connection terminal. During current conduction of the direct current breaker, current flows through the main current branch. The transfer branch is connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch. The energy dissipation branch is connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch and the transfer branch. The blowout unit is arranged between the main current branch and the transfer branch.

First claim

What is claimed is:

1. A direct current breaker based on vacuum magnetic blowout transfer, comprising:
a first connection terminal, configured as an inlet wire of the direct current breaker;
a second connection terminal, configured as an outlet wire of the direct current breaker; a main current branch comprising a vacuum mechanical switch, connected between the first connection terminal and the second connection terminal, wherein during current conduction of the direct current breaker, current flows through the main current branch;
a transfer branch comprising at least two IGBT/IGCT (Insulated Gate Bipolar Transistor)/(Integrated Gate Commutated Thyristor) in series, connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch;
an energy dissipation branch, connected between the first connection terminal and the second connection terminal and connected in parallel with the main current branch and the transfer branch; and
a blowout unit, arranged between the main current branch and the transfer branch, wherein the blowout unit comprises a blowout circuit and a blowout coil in parallel; during current breaking of the direct current breaker, the blowout circuit excites the blowout coil to generate magnetic blowout so as to raise an arc voltage; and the current is transferred from the main current branch to the transfer branch based on the arc voltage.

2. The direct current breaker according to claim 1 , wherein the blowout coil comprises a transverse-magnetic blowout coil and/or a longitudinal-magnetic blowout coil, and the blowout circuit is an independent external circuit.

3. The direct current breaker according to claim 1 , wherein after the current is completely transferred from the main current branch to the transfer branch, the transfer branch is turned off, and the current is transferred into the energy dissipation branch to achieve direct current breaking.

4. The direct current breaker according to claim 1 , wherein the direct current breaker is a one-way direct current breaker or a two-way direct current breaker.

5. A breaking method of the direct current breaker according to claim 1 , comprising the following steps:
Step I, during current conduction of the direct current breaker, enabling the current to pass through the main current branch; Step II, during current breaking of the direct current breaker, exciting, by the blowout circuit, the blowout coil to generate magnetic blowout so as to raise the arc voltage, and transferring the current from the main current branch to the transfer branch based on the arc voltage; and
Step III, after the current is completely transferred from the main current branch to the transfer branch, turning off the transfer branch, and transferring the current into the energy dissipation branch to achieve direct current breaking.

6. The breaking method of the direct current breaker according to claim 5 , wherein the blowout coil comprises a transverse-magnetic blowout coil and/or a longitudinal-magnetic blowout coil, and the blowout circuit is an independent external circuit.

7. The breaking method of the direct current breaker according to claim 5 , wherein after the current is completely transferred from the main current branch to the transfer branch, the transfer branch is turned off, and the current is transferred into the energy dissipation branch to achieve direct current breaking.

8. The breaking method of the direct current breaker according to claim 5 , wherein the direct current breaker is a one-way direct current breaker or a two-way direct current breaker.

Assignees

• Univ Xi An Jiaotong

Inventors

• Wu Yi
• Wu Yifei
• Yang Fei
• Rong Mingzhe
• Niu Chunping

Classifications

• H01H33/596 Primary

  for interrupting DC · CPC title

• H01H33/18 Primary

  using blow-out magnet {(for vacuum switches H01H33/664)} · CPC title

• H01H2085/386

  with magnetic or electrodynamic arc-blowing · CPC title

• H01H33/6641

  making use of a separate coil · CPC title

• H02H9/02

  responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} · CPC title