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Method for measuring grounding impedance of large grounding grid

A technology of grounding impedance and grounding grid, applied in the direction of grounding resistance measurement, etc., can solve the problems of large capacity of test transformer, large measurement error and high test cost.

Inactive Publication Date: 2020-11-24
大唐水电科学技术研究院有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing grounding impedance test method has large measurement error, large test transformer capacity, and high test cost

Method used

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  • Method for measuring grounding impedance of large grounding grid

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] ginseng figure 1 As shown, this embodiment provides a method for measuring the grounding impedance of a large grounding grid, including:

[0018] 1) Use frequency conversion equipment to measure the grounding impedance to reduce the error of the grounding impedance:

[0019] The test power supply is rectified into a DC power supply through a frequency conversion cabinet, the DC power supply is inverted into an AC power supply, and the grounding impedance measurement is performed after the AC power supply passes through an isolation transformer.

[0020] 2) Measure the grounding resistance by means of capacitor compensation in series to reduce the capacity of the t...

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Abstract

The invention relates to a method for measuring the grounding impedance of a large grounding grid, and the method comprises the steps: frequency conversion equipment is employed to measure the grounding impedance, so as to reduce the error of the grounding impedance; the grounding resistance is measured in a mode of capacitance compensation through the series capacitor, so as to reduce the capacity of the test transformer. Compared with a conventional grounding impedance measurement method, the method is more accurate, higher in economical efficiency, more accurate in measurement result and higher in economical efficiency, and grounding impedance obtained through a simulation experiment is more reliable and authentic.

Description

technical field [0001] The invention belongs to the technical field of electrical testing, in particular to a method for measuring the grounding impedance of a large-scale grounding grid. Background technique [0002] In order to ensure that no one is injured, power plants and substations must conduct grounding impedance tests. The grounding impedance is compared with the design value. The accuracy of the grounding impedance test is very important. If the grounding impedance is greater than the design value, the grounding network must be modified to avoid The accident caused casualties and economic losses. The existing grounding impedance test method has large measurement error, large test transformer capacity and high test cost. Contents of the invention [0003] The purpose of the present invention is to provide a method for measuring the grounding impedance of a large grounding grid to solve the above technical problems. [0004] The invention provides a method for me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
CPCG01R27/20
Inventor 曾加跃汪凤月周亮
Owner 大唐水电科学技术研究院有限公司