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Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model

A high-frequency arc and isolating switch technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems that cannot meet the requirements of accurate simulation of ultra-fast transient overvoltage VFTO, roughness, and no test verification

Active Publication Date: 2015-03-04
STATE GRID CORP OF CHINA +3
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Problems solved by technology

Therefore, the current high-frequency arc resistance models are all empirical formulas, which are relatively rough, have no experimental verification, do not reflect the influencing factors of arc resistance, and cannot meet the requirements of accurate simulation of ultra-fast transient overvoltage VFTO

Method used

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  • Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model
  • Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model
  • Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model

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Embodiment Construction

[0077] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0078] The flow chart of the GIS isolating switch high-frequency arc resistance model modeling method provided by the present invention is as follows Figure 23 shown, including the following steps:

[0079] Step 1: Through the SF6 gap high-frequency arc test, the steady-state arcing resistance mathematical model is obtained; that is, the establishment of the steady-state arcing resistance mathematical model:

[0080] The high-frequency arc in the GIS isolating switch is enclosed in a metal shell and is at a high potential, so observation and analysis are very difficult. Therefore, an SF6 gap close to the gap distance of the GIS isolating switch is established, and the Marx generator is used to discharge a high-frequency arc to it. By observing the spectrum of the high-frequency arc and analyzing its arc resistance, a s...

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Abstract

The invention relates to a modeling method for a GIS disconnecting switch high frequency voltaic arc resistance model, the method holds that a high frequency voltaic arc consists of three stages, namely pre-breakdown, arcing and arc blowout; voltaic arc resistance decreases according to an exponential form in the pre-breakdown stage, is a stable value in the arcing stage, and increases according to the exponential law when entering the arc blowout stage. By SF6 gap high frequency arcing tests, the effect law of a stable arcing resistance, a current peak, air pressure and a voltaic arc length on the voltaic arc resistance is obtained so as to build a steady state arcing resistance math model; by GIS disconnecting switch hot-line operation tests, the time varying law and parameter of the voltaic arc resistance are obtained so as to build a double exponential time varying math model of the GIS disconnecting switch voltage arc resistance; and by carrying out emulation calculation on very fast transient overvoltage generated by GIS disconnecting switch hot-line operation, in comparison with a GIS disconnecting switch test result, the effectiveness of the GIS disconnecting switch high frequency voltaic arc resistance match model is verified, and the scientific nature and accuracy degree of the very fast transient overvoltage are obviously improved.

Description

technical field [0001] The invention relates to a modeling method, in particular to a modeling method for a high-frequency arc resistance model of a GIS isolating switch. Background technique [0002] In gas-insulated metal-enclosed switchgear (GIS), the live operation of the isolating switch generates a very fast transient overvoltage (VFTO), which has high amplitude (up to 3.0p.u.), large steepness (rise time can be as low as several ns), frequency Abundant (from quasi-DC to hundreds of MHz) characteristics pose an important threat to the insulation of GIS and its connected winding equipment (transformers and reactors, etc.) widely used in EHV and UHV systems. A high-frequency arc will appear during the VFTO generation of the GIS isolating switch. The resistance of the high-frequency arc determines the attenuation and termination of the VFTO, which comprehensively reflects the influence of the mechanical and electrical characteristics of the GIS isolating switch on VFTO. ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/00
Inventor 陈维江李志兵张乔根詹花茂李晓昂段韶峰颜湘莲王浩
Owner STATE GRID CORP OF CHINA
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