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Grounding grid of urban full-indoor transformer substation of 220kV

A technology for substations and grounding grids, applied in the direction of substation grounding layout, etc., can solve the problems of high cost, large amount of drag-reducing agent, easy pollution of drag-reducing agent, etc., and achieve the effect of reducing resistivity

Inactive Publication Date: 2013-06-19
HENNAN ELECTRIC POWER SURVEY & DESIGN INST +3
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Problems solved by technology

Filling materials with low resistivity or drag-reducing agents requires a large amount of work and high cost, and drag-reducing agents are prone to pollution. If the groundwater source is shallow, it should not be used

Method used

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  • Grounding grid of urban full-indoor transformer substation of 220kV

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Embodiment Construction

[0023] In the present invention, the grounding grid of the urban 220kV indoor substation is located below each power distribution building in the substation, generally including the horizontal grounding grid I1 at -0.8m, and the soil resistivity of the -0.8m layer is generally higher. It reaches hundreds of Ω m, so the grounding resistance of this layer is relatively large. In the present invention, an additional layer of horizontal ground grid II2 is made at a height of about -3m to -5m above the strip base of the power distribution building and is connected in parallel with the horizontal ground grid I1 of -0.8m. In order to save the amount of work, the extension of the ground grid can be basically equal to the extension of the strip foundation; if the substation has two distribution buildings, the horizontal ground grid II2 above the strip foundation of the two buildings must be connected. With this method, if the soil resistivity is lower in the deep underground, the groun...

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Abstract

Provided is a grounding grid of an urban full-indoor transformer substation of 220kV. The grounding grid is arranged below each power distribution building in a transformer substation, comprises a horizontal grounding grid I located at -0.8m, and further comprises a horizontal grounding grid II located at -3m to -5m. The horizontal grounding grid I and the horizontal grounding grid II are connected in parallel, and therefore a double-layer horizontal grounding grid is formed. The grounding grid of the urban full-indoor transformer substation of 220kV can effectively reduce the electrical resistivity of the grounding grid.

Description

technical field [0001] The invention relates to a design scheme of a grounding grid, in particular to a grounding grid for an urban 220kV indoor substation. Background technique [0002] With the development of cities, the pace of urban power grid construction is accelerating, and more and more 220kV substations in urban centers are being planned and constructed. The construction of the substation in the center of the city must adapt to the surroundings of the city, such as not causing noise and electromagnetic pollution to the surroundings. In addition, reducing the footprint of substations is also the main goal of urban substations. For this reason, the 220kV substation in the city center generally adopts an all-indoor layout, that is, building one or two distribution buildings; 220kV and 110kV power distribution devices use GIS, and 10kV or 35kV use switch cabinets; All other electrical equipment are arranged in the power distribution building. The area within the wall...

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Application Information

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IPC IPC(8): H02B5/01
Inventor 顾尔重王宏伟郭献军张继军田俊强耿建风
Owner HENNAN ELECTRIC POWER SURVEY & DESIGN INST
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