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Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method

A technique for grounding resistance and determining voltage, which is applied in the field of high voltage

Inactive Publication Date: 2010-12-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

In addition, if the position of the current pole is placed closer to the ground grid, such as around 1 times the length of the diagonal line, the real situation of the ground grid can no longer be equivalent to the hemispherical ground pole.

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  • Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method
  • Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method
  • Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method

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Embodiment Construction

[0109] based on the following Figure 4 ~ Figure 7 , specify a preferred embodiment of the present invention:

[0110] When using the short-distance measurement method to test the grounding resistance of the substation, it is necessary to use the numerical calculation method to simulate the potential distribution of the ground grid with or without the current pole according to the actual shape of the grounding body under the condition that the position of the current pole is given. Then determine the position of the compensation point, that is, the placement position of the voltage pole. However, the shapes of ground grids are various, and almost no ground grids of the same shape exist, and their specific shapes are not all regular. Therefore, for the convenience of calculation, the specific ground grid is usually equivalent to several ground rods along the directions of x-axis, y-axis and z-axis respectively.

[0111] This example is Figure 4 The ground grid shown in.

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Abstract

The invention relates to a method for determining the position of a voltage electrode in the measurement of grounding resistance in a transformer substation by the short-distance method. The method comprises the method of calculating the distribution of drain current in a ground net conductor and the grounding resistance and the method of calculating the ground potential, and the test position of the voltage electrode is given out according to the principles of the compensation method based on the calculation results of the two methods. The method can suppress or eliminate the related interference factors during the field test process while realizing the short-distance measurement of the grounding resistance, greatly save manpower and material resources and have important engineering practical value.

Description

technical field [0001] The invention relates to the technical field of high voltage, and mainly relates to a method for determining the test position of a voltage electrode when measuring grounding resistance by using a short-distance measurement method. Background technique [0002] For the needs of work and safety, some conductive parts of the electrical installations and facilities in the power system or buildings are connected to the ground electrode through the ground wire, which is grounding. Grounding resistance is one of the important technical indicators to characterize the electrical performance of the grounding device. It refers to the ratio of the voltage U on the electrode to the current I when the current I flows into the earth through the grounding electrode. It includes the resistance of the grounding lead and the resistance of the grounding electrode body. , the contact resistance between the ground electrode and the soil and the soil resistance from the ele...

Claims

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Application Information

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IPC IPC(8): G01R27/20
Inventor 施伟斌金之俭金伟徐剑王丰华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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