Very fast transient overvoltage suppression structure and gas insulated substation integrated equipment
A transient overvoltage, gas-insulated technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem of increasing the complexity of GIS assembly and the probability of mechanical or electrical failures , The reliability of the isolation switch cannot be guaranteed, etc., to achieve the effect of improving the electric field distribution, improving the working reliability, and suppressing VFTO
Active Publication Date: 2021-08-13
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a very fast transient overvoltage suppression structure and gas insulated substation integrated equipment. The suppression structure wraps the outer side of a primary bus of a gas insulated substation or is arranged on the inner side of a shell of the gas insulated substation. The suppression structure comprises an insulating layer, a damping resistance layer and a semiconductor layer. According to the invention, starting from a primary equipment structure, the insulating layer, the damping resistance layer and the semiconductor layer are added on the premise of not changing the structures of a GIS sleeve, a shell and a pipeline guide rod according to an electromagnetic wave dispersion principle, so that the separation of a power frequency signal and a high-frequency VFTO signal is realized, and the impedance of the high-frequency signal is obviously increased, thereby achieving the purpose of suppressing VFTO, and realizing the protection of the primary equipment and the secondary equipment. The technical scheme provided by the invention is simple in structure, is suitable for the improvement of the existing GIS integrated equipment bus and shell structure, and can guide the design of the novel GIS integrated equipment bus 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More 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