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Fault current discharge device with arc extinguishing protection and control method thereof

A technology of fault current and current leakage, which is applied in the field of power system, can solve the problems of high cost, large loss, failure to integrate fault current leakage devices into the power grid, etc., achieve fast control speed, accelerate extinguishing speed, and solve the problem that the arc cannot be extinguished in time Effect

Active Publication Date: 2019-11-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the cost of this solution is high, the loss is large, and the solution cannot contain components such as inductors and capacitors, which will affect the leakage effect of the bleeder, and cannot be directly incorporated into the power grid as a fault bleeder

Method used

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  • Fault current discharge device with arc extinguishing protection and control method thereof
  • Fault current discharge device with arc extinguishing protection and control method thereof
  • Fault current discharge device with arc extinguishing protection and control method thereof

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Embodiment 1

[0035] Figure 4 It is a structural schematic diagram of a fault current discharge device with arc extinguishing protection according to an embodiment of the present invention.

[0036] Such as Figure 4 As shown, the fault current leakage device with arc extinguishing protection includes: a fault current leakage device 10 , a first current collector 20 , a controller 30 and a voltage collector 40 .

[0037] Among them, see Figure 4 , the fault bleeder 10 includes a first controllable switch K1, a bleeder circuit 11 and a protection circuit 12, the bleeder circuit 11 includes a first bleeder resistor R11 and a vacuum switch CB connected in series, and the protection circuit 12 includes a first capacitor C1 , arrester 121, second capacitor C2, first resistor R1, controllable gap G and superconducting resistor R0 connected in series, second controllable switch K2, one end of the first controllable switch K1 is connected to the transmission line L, connected in series One end...

Embodiment 2

[0053] Figure 9 It is a flow chart of the control method of the fault current discharge device with arc extinguishing protection according to the embodiment of the present invention.

[0054] In this embodiment, the control method is used for the above Figure 5 Fault current relief device with arc extinguishing protection shown. Such as Figure 9 As shown, the control method includes the following steps:

[0055] S1. Acquire the data collected by the first current collector.

[0056] S2. Determine whether the rate of change of the current flowing through the arrester is greater than a preset rate threshold according to the data collected by the first current collector.

[0057] S3, if the rate of change of the current flowing through the arrester is greater than the preset rate threshold, control the vacuum switch to be disconnected, and acquire the data collected by the voltage collector.

[0058] S4, judging whether the voltage at both ends of the controllable gap is ...

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Abstract

The invention discloses a fault current discharge device with arc extinguishing protection and a control method thereof. The fault current discharge device comprises a fault discharge device and a controller. The fault discharge device comprises a discharge circuit and a protection circuit. The discharge circuit comprises a first discharge resistor and a vacuum switch. The protection circuit comprises a first capacitor, a lightning arrester, a second capacitor, a first resistor, a controllable gap, a superconducting resistor and a second controllable switch. The first discharge resistor and the vacuum switch are connected in series between a power transmission line and ground. The first capacitor, the lightning arrester, the second capacitor and the first resistor after being connected inseries are all connected in parallel with the discharge circuit. The controllable gap and the superconducting resistor are connected in series and then connected in parallel with the second capacitor.The controller is used for controlling the vacuum switch to open when the change rate of the current flowing through the lightning arrester is greater than the preset rate threshold and controlling the second controllable switch to close when the voltage of the two ends of the controllable gap is greater than the preset voltage threshold. The discharge device can realize accurate control of the switch and arc extinguishing protection of the controllable gap.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a fault current discharge device with arc extinguishing protection and a control method thereof. Background technique [0002] With the increasing use of clean energy, the grid-connected capacity of distributed power generation has expanded rapidly, which has improved the transmission capacity of the power grid and met the demand for load growth in the power system. However, it has also increased the short-circuit capacity of power grids at all levels. The current can be as high as 100KA and the rising speed of the short-circuit current is further accelerated. If the short-circuit fault cannot be removed in time, the large electric power generated when the short-circuit current flows through the electrical equipment and wires will seriously endanger the normal operation of the power system equipment and power system. The traditional short-circuit fault removal method is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/08
CPCH02H9/023H02H9/025H02H9/08Y02E40/60
Inventor 黎灿兵蒋林刘绪斌李喆骁张聪
Owner HUNAN UNIV