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Ultra-fast transient overvoltage suppression structure and integrated equipment for gas-insulated substation

A transient overvoltage, gas-insulated technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve the problem that the reliability of the isolation switch cannot be guaranteed and increase the complexity of GIS assembly and the probability of mechanical or electrical failure, to achieve the effect of improving electric field distribution, improving work reliability, and suppressing VFTO

Active Publication Date: 2021-10-01
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] As mentioned above, the current VFTO suppression methods all need to introduce new components into the GIS circuit, which increases the complexity of GIS assembly and the probability of mechanical or electrical failure, and the reliability of the isolation switch cannot be guaranteed

Method used

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  • Ultra-fast transient overvoltage suppression structure and integrated equipment for gas-insulated substation
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  • Ultra-fast transient overvoltage suppression structure and integrated equipment for gas-insulated substation

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Embodiment Construction

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0036] figure 1 Schematic for VFTO formation. There are two sections of GIS primary busbars at both ends of the disconnector, each with electromagnetic energy W 1 and W 2 , when the isolating switch is opened and closed, the electromagnetic energy will be migrated and redistributed. Due to the good electrical conductivity of the GIS primary busbar, the energy loss of the electromagnetic energy is very small during the redistribution process, and the generated traveling wave undergoes multiple refraction and reflection to form an ultra-fast transient state with an amplitude of up to 3p.u. and a frequency of up to hundreds of MHz. Overvoltage, that is, VFTO is formed.

[0037] figure 2 Taking the high-frequenc...

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Abstract

The invention relates to an ultra-fast transient overvoltage suppression structure and an integrated device for a gas-insulated substation. The suppression structure is coated on the outside of the primary bus bar of the gas-insulated substation or arranged inside the shell of the gas-insulated substation; the suppression structure Including insulating layer, damping resistor layer and semiconductor layer. The present invention starts with the primary equipment structure, and based on the principle of electromagnetic wave dispersion, without changing the structure of the GIS bushing, shell and pipe guide rod, an insulating layer, a damping resistance layer and a semiconductor layer are added to realize power frequency signals and high frequency VFTO signals The separation can significantly increase the high-frequency signal impedance, so as to achieve the purpose of suppressing VFTO and realize the protection of primary equipment and secondary equipment. The technical solution provided by the invention is simple in structure, not only applicable to the improvement of the existing GIS integrated equipment busbar and shell structure, but also can guide the design of the new GIS integrated equipment busbar and shell structure.

Description

technical field [0001] The invention relates to the field of power equipment operation protection, in particular to a VFTO suppression structure used for GIS integrated equipment. Background technique [0002] In the gas insulated switchgear (GIS) substation (Gas Insulated Switchgear, GIS), the moving contact speed of the moving contact is slow during the opening and closing process, which will cause multiple reignitions or pre-breakdowns in the SF6 gas gap between the disconnector breaks. Every breakdown will produce a steeply changing voltage traveling wave, which will undergo multiple refraction, reflection and superposition at the discontinuity point of the wave impedance inside the GIS, and finally form a very fast transient overvoltage (Very Fast Transient Over-Voltage, VFTO). VFTO is different from the conventional operating overvoltage of ordinary air-insulated substations. It has four main characteristics: first, the waveform rise time is extremely short, usually in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02B13/025H02B13/045H02H9/04
CPCH02B13/025H02B13/045H02H9/044
Inventor 陈庆李红斌韩林汕
Owner HUAZHONG UNIV OF SCI & TECH
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