A Method for Selecting the Value of Bypass Capacitor to Suppress Switching Arc

A bypass capacitor and arc switching technology is applied in emergency protection circuit devices, circuit devices, and CAD circuit design for limiting overcurrent/overvoltage. Inhibition effect, etc.

Active Publication Date: 2021-06-25
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the value of the bypass capacitor will change the time of the DC arc extinguishing process and affect the suppression effect on the DC arc

Method used

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  • A Method for Selecting the Value of Bypass Capacitor to Suppress Switching Arc
  • A Method for Selecting the Value of Bypass Capacitor to Suppress Switching Arc
  • A Method for Selecting the Value of Bypass Capacitor to Suppress Switching Arc

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] A method for selecting a value of a bypass capacitor for suppressing switching arcs, comprising the following steps:

[0033] First, establish the model of the DC side power supply line of the subway, such as figure 1 shown. The modeling process is carried out in MATLAB / Simulink.

[0034] Step 1: Construct the model of the subway rectification system composed of subway converter station 1, DC feeder 2 and return line 9; the subway converter station 1 in the model can provide DC voltage with a voltage level of 1500V.

[0035] Step 2: Construct the DC circuit breaker model 3 in the subway traction power supply system connected in series at the head end of the DC feeder 2;

[0036] Step 3: connect the subway catenary model 7 in series at the end of the DC circuit breaker model along the direction of the DC current in the traction power s...

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Abstract

The invention discloses a value selection method of a bypass capacitor for suppressing switch arcs, which comprises the following steps: step 1: constructing a model of a subway rectification system composed of a subway converter station, a DC feeder line and a return line; step 2: building a series connection The DC circuit breaker model in the subway traction power supply system connected to the head end of the DC feeder; Step 3: connect the subway catenary model in series at the end of the DC circuit breaker model along the direction of the DC current in the traction power supply system, and connect the catenary model and The subway locomotive model is set between the return lines; step 4: according to the constructed model, the value of the bypass capacitor C is selected through simulation experiments; the present invention can effectively suppress the DC arc generated during the breaking process of the subway DC circuit breaker, and reduce the DC arc The ablation of the subway DC circuit breaker is also able to successfully break the bypass capacitor value of the circuit after the DC arc is extinguished.

Description

technical field [0001] The invention relates to a method for selecting the numerical value of a bypass capacitor for suppressing switch arcs. Background technique [0002] Adding an additional branch at both ends of the mechanical DC circuit breaker used in the DC side power supply line of the subway can effectively suppress the DC arc generated during the breaking process, reduce the ablation of the DC arc, and improve the DC circuit breaker of the subway. service life. At present, there is an additional branch composed of AC circuit breakers, bypass capacitors, and energy-dissipating resistors. This branch uses the characteristics of small capacitive impedance and the shunting effect of parallel circuits to quickly reduce the arc when the subway DC circuit breaker is broken. Current, to achieve the suppression of the DC arc in the circuit breaker. This additional branch is a commutation branch. Compared with the commutation branch composed of high-power electronic compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02G06F30/39
CPCH02H9/02
Inventor 林圣张笑瑞张海强何江海闫雅斌段振涛
Owner SOUTHWEST JIAOTONG UNIV
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