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Grounding grid broken point diagnosis method and transient electromagnetic detection device

A transient electromagnetic and detection device technology, which is applied in the direction of detecting faults and fault locations according to conductor types, and can solve problems affecting the operation of power systems and power outages in substations

Active Publication Date: 2017-05-10
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0005] The invention provides a grounding grid breakpoint diagnosis method and a transient electromagnetic detection device to solve the problems in the prior art that depend on the design data of the grounding grid, or require a substation to be powered off, and affect the operation of the power system

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  • Grounding grid broken point diagnosis method and transient electromagnetic detection device
  • Grounding grid broken point diagnosis method and transient electromagnetic detection device
  • Grounding grid broken point diagnosis method and transient electromagnetic detection device

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Embodiment Construction

[0037] The transient electromagnetic method is a geophysical method. It establishes a pulsed magnetic field underground through a sending coil. The secondary eddy current field is observed by the coil, and the longitudinal distribution of the formation resistivity is deduced through inversion, which can form a longitudinal resistivity profile. Compared with other resistivity detection methods, the transient electromagnetic method has the characteristics of strong penetrating ability, high resolution, small volume effect and non-contact measurement. Comprehensive detection of difficult problems provides new ideas.

[0038] see figure 1 , is a schematic flowchart of a method for diagnosing a ground grid breakpoint provided by an embodiment of the present invention.

[0039] The grounding grid breakpoint diagnosis method provided by the embodiment of the present invention includes:

[0040] S100: Set a test measurement line above the grounding grid to be diagnosed, and establi...

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Abstract

The invention discloses a grounding grid broken point diagnosis method and a transient electromagnetic detection device. The method comprises the following steps: setting a testing survey line above a grounding grid to be diagnosed; establishing a plurality of measurement point coordinates along the testing survey line; carrying out point-to-point measurement by the transient electromagnetic detection device along the measurement point coordinates of the testing survey line, so as to obtain induced voltage data of the measurement point coordinates; calculating according to the induced voltage data to obtain a magnetic field intensity value along the vertical direction and establishing a three-dimensional magnetic field intensity contour map of a testing region; and analyzing the three-dimensional magnetic field intensity contour map and judging whether the grounding grid has broken points or not. The diagnosis method disclosed by the invention does not depend on a grounding grid design construction drawing and a transformer substation does not need to be powered off; and grounding grid broken point diagnosis can be realized without excavation and power outage and the economic loss of a diagnosis process is reduced.

Description

technical field [0001] The invention relates to the technical field of grounding grid breakpoint diagnosis in electric power systems, in particular to a grounding grid breakpoint diagnosis method and a transient electromagnetic detection device. Background technique [0002] The integrity and reliability of the grounding grid is a necessary guarantee for the safe operation of the power system. The conductors that make up the grounding grid are buried underground. Often due to poor welding, missing welding or soil corrosion during construction, the conductors break and cause the grounding grid to leak. Performance degradation not only threatens equipment and personal safety, but also brings huge economic losses and social impacts. However, the grounding grid is an underground concealed project. After operation, the rust condition of the grounding body is visually inspected and evaluated. Therefore, it is particularly important to study the fault diagnosis technology of the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/083Y04S10/52
Inventor 沈鑫曹敏闫永梅李月梅魏龄赵旭唐立军邹京希常亚东毛天仝子靖
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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