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Electrical equivalent model of metal oxide arrester varistor under action of VFTO

An equivalent model and oxide technology, applied in the field of value models, can solve problems such as inability to propose, volt-ampere characteristics, imperfect impedance characteristics of response characteristics, etc., and achieve a wide range of applications

Inactive Publication Date: 2015-08-26
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the VFTO impulse current wave head time is within tens of nanoseconds or even several nanoseconds. Up to now, the research on the volt-ampere characteristics, response characteristics, and impedance characteristics of MOA under the ultra-fast wavefront transient voltage based on my country's MOV formula technology has not yet been completed. It is not perfect, and it is impossible to propose an equivalent calculation model suitable for my country's MOV characteristics under VFTO ultra-fast transient impact

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  • Electrical equivalent model of metal oxide arrester varistor under action of VFTO
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  • Electrical equivalent model of metal oxide arrester varistor under action of VFTO

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Embodiment

[0028] According to the electric equivalence model of metal oxide surge arrester resistive sheet under the action of VFTO proposed by the present invention, a set of coaxial generating device and measurement system capable of outputting 20ns ultra-fast wavefront can be used to output wavefront time within 25ns and current on resistive sheet. The peak value is the impulse current of 0.5kA~2kA, and the relevant parameters of the Φ136 / 54×20 (D136) resistor sheet are obtained through the test.

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Abstract

The present invention discloses an electrical equivalent model of a metal oxide arrester varistor under action of VFTO, comprising a linear inductor (L1), a nonlinear resistor (R1), a linear resistor (R0), and a linear capacitor (C0). The linear inductor (L1) and the nonlinear resistor (R1) form a first serial branch, the linear resistor (R0) and the linear capacitor (C0) form a second serial branch, the first serial branch and the second serial branch form a parallel branch, one end of the parallel branch is a low-voltage end, and the other end of the parallel branch is a high-voltage end. When an external voltage is lower than an impedance breakover voltage U0, a current that flows through the R0C0 branch is greater than a current that flows through the R1L1 branch, an MOV mainly externally presents a capacitive impedance feature. When the external voltage is higher than the impedance breakover voltage U0, the current that flows through the R0C0 branch is greater than the current that flows through the R1L1 branch, the MOV externally presents an inductive impedance feature. The electrical equivalent model provided by the present invention is used for simulation calculation of MOV features under the action of the VFTO.

Description

Technical field: [0001] The invention belongs to the field of overvoltage protection of power system GIS power stations, and in particular relates to an electrical equivalent model of a metal oxide lightning arrester resistance sheet under the action of VFTO. Background technique: [0002] The operation of the isolation switch in the power system GIS (Gas-insulated Metal-enclosed Switchgear) will cause a very fast transient overvoltage (VFTO) with a frequency of about 1MHz to 100MHz and a peak value of up to 2.5p.u. VFTO with high amplitude and steep wave front will threaten the insulation of GIS internal equipment and transformers and other equipment. As the main protection equipment for overvoltage, the volt-ampere characteristics and protection characteristics of Metal Oxide Arrester (MOA) under the action of ultra-fast wave front transient voltage (VFTO) have received great attention. Coordination, arrester parameter selection, and the MOA model in numerical simulation ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈洁郭洁戴敏乔兵兵王磊李振强李可伦矫立新
Owner XI AN JIAOTONG UNIV
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