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Mounting method of graphite-based flexible grounding body

A flexible grounding and installation method technology, applied in the direction of connection, connection contact material, line/collector components, etc., can solve the problems of damage to electrical equipment, personal safety threats of grid operators, etc., and achieve the effect of reducing impact grounding resistance

Inactive Publication Date: 2016-12-14
CENT CHINA BRANCH OF STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When lightning strikes the line, if the impact grounding resistance of the grounding electrode is high, a high dangerous voltage will be formed at both ends of the line

Method used

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  • Mounting method of graphite-based flexible grounding body

Examples

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Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] The length of the grounding body 1 is 40m, the diameter is 28mm, the local soil resistivity is 1000Ω·m, it is laid horizontally, and the buried depth is 1m. Calculating the impulse grounding resistance considering the spark effect, the impulsive grounding current waveform is set to 2.6 / 50μs, the peak value is 50kA, and the impulsive grounding resistance of the grounding body 1 is R=28.86Ω. In this embodiment, the ground body 1 is equivalent to a traditional graphite-based flexible ground body.

Example Embodiment

[0024] Example 2

[0025] The length of the grounding body 1 is 40m and the diameter is 28mm. The length of the needled graphite 2 is 2.5m and the diameter is 28mm. Connect the two pieces of acupuncture graphite 2 to the same position of the grounding body 1, that is, the injection point 3. The included angle between the two sections of acupuncture graphite 2 and the grounding body 1 is 90°, see figure 1 . The local soil resistivity is 1000Ω·m, and it is laid horizontally, with a buried depth of 2m, so that the grounding body 1 and the needled graphite 2 are on the same horizontal plane. The impulse ground resistance calculation considering the spark effect is also carried out. The impulse ground current waveform is set to 2.6 / 50μs and the peak value is 50kA. The impulse ground resistance R of the graphite-based flexible grounding body of this embodiment is obtained. 1 =27.65Ω. Compared with the traditional graphite-based flexible grounding body without needled graphite, the im...

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Abstract

The invention provides a mounting method of a graphite-based flexible grounding body. The mounting method comprises: (1) horizontally burying a grounding body main body and a plurality of needled graphite, wherein the burying depth is 0.5m to 1m; (2) connecting the needled graphite to the same position or different positions of the grounding body main body on site; connecting two sections of needled graphite to the same position at the most, wherein an included angle between the needled graphite and the grounding body main body is not 0 degree, the grounding body main body and the needled graphite are the graphite-based flexible grounding bodies, diameters of the needled graphite and the grounding body main body are the same or different and the length of the needled graphite is 1 percent to 25 percent of the length of the grounding body main body; (3) backfilling by adopting backfilling soil. According to the method provided by the invention, the traditional graphite-based flexible grounding body is connected with the needled graphite and a spark effect is sufficiently utilized, so that impacting grounding resistance of the graphite-based flexible grounding body is reduced.

Description

Technical field [0001] The invention belongs to the technical field of lightning protection and grounding of power systems, and in particular relates to a method for installing a graphite-based flexible grounding body. Background technique [0002] The grounding device of the transmission line is the basic guarantee and important measure to maintain the safe and reliable operation of the power system, and to ensure the safety of electrical equipment and operators. The grounding electrode with good impact characteristics can provide effective protection for the transmission line, so as to avoid power outages caused by lightning strikes, and is of great significance to the safe operation of the power system and the reliability of power supply. [0003] With the development of my country's power grid and the improvement of power system stability, the proportion of accidents caused by lightning strikes is increasing among all power system failures. When lightning strikes the line, if ...

Claims

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Application Information

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IPC IPC(8): H01R4/66H01R43/00
CPCH01R4/66H01R43/00
Inventor 张昌甘艳唐烈峥阮江军黄道春
Owner CENT CHINA BRANCH OF STATE GRID CORP OF CHINA
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