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Earthing process for transforming plant protecting device shielding chamber

A grounding method and technology for protecting equipment, applied in the fields of magnetic field/electric field shielding, substation/switch layout details, electrical components, etc., can solve problems such as design difficulties, loss of protective effect of protection cells, hidden dangers of safe and stable operation of power systems, etc. Effects of Accuracy and Reliability

Active Publication Date: 2012-05-09
STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of in-depth and systematic research on the grounding of the protection cell, it has brought certain difficulties to the design of reducing electromagnetic disturbance, and the unreasonable grounding method will cause the protection cell to lose its proper protection effect, which will bring a negative impact on the safe and stable operation of the power system. to hidden danger

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  • Earthing process for transforming plant protecting device shielding chamber
  • Earthing process for transforming plant protecting device shielding chamber
  • Earthing process for transforming plant protecting device shielding chamber

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.

[0019] Detailed steps of the present invention are:

[0020] The first step: analyze the purpose of grounding the protective chamber;

[0021] There is a special grounding grid embedded in the substation, and the design of the grounding grid should meet the requirements of various conditions:

[0022] a. Lower grounding resistance;

[0023] b. Limit step voltage and touch voltage;

[0024] c. Reduce high frequency and low frequency common mode disturbance;

[0025] d. Able to withstand high short-circuit current.

[0026] How to ground the protection cell above the ground grid is one of the important issues in the design and construction of the protection cell. Obviously, reducing high-frequency and low-frequency common-mode disturbances is the purpose of protectin...

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Abstract

The invention relates to a grounding method for a shielding chamber of protective equipment in a transformer substation. The method comprises the following steps: firstly, the aim to ground a protective chamber is analyzed; after the aim is known, the influences of the different grounding modes on reduction of electromagnetic disturbance are compared; and the reasonable grounding modes and the realization methods are determined through tests, investigations, and accumulation of operating experience. The grounding method is very accurate, and can provide basis and reference for designing the grounding of the protective chamber of secondary units in high-voltage transformer substations in the future.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation engineering, and specifically relates to a grounding method for a shielding chamber of a substation protection equipment. Background technique [0002] my country's electric power construction is developing rapidly. At present, the country has formed a power network with 500kV voltage level transmission lines as the backbone skeleton. The world-renowned Three Gorges Project is a power transmission and transformation project with a 500kV voltage level as the output line level. It meets the electricity demand for the sustainable development of my country's economy and society. [0003] The power transmission and transformation project includes two parts: power transmission and power transformation, and the substation performs the power transformation task. Since there are many primary high-voltage equipment in the substation and the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02B1/00H05K9/00
Inventor 邬雄万保权张广洲张小武王勤蒋虹张业茂
Owner STATE GRID ELECTRIC POWER RES INST