A Calculation Method of Tower Grounding Resistance Based on Loop Impedance Test

A technology of grounding resistance and loop impedance, applied in the field of tower grounding resistance calculation based on loop impedance test, can solve problems such as loop impedance test result error and so on

Active Publication Date: 2021-06-08
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and the purpose is to provide a method for calculating the grounding resistance of towers based on loop impedance testing, and to solve the problem of large errors in loop impedance testing results

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  • A Calculation Method of Tower Grounding Resistance Based on Loop Impedance Test

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Embodiment

[0030] Such as figure 1 As shown, the present invention a kind of tower grounding resistance calculation method based on loop impedance test, comprises the following steps:

[0031] Step 1: Obtain the basic information of the transmission line: obtain the number of towers of the transmission line, the horizontal distance between two suspension points in the plane parallel to the specific load of the conductors between two adjacent towers, and the signal of the ground wire.

[0032] Step 2: Establish the circuit model of the loop impedance of the transmission line: for each base tower, establish a circuit model for the test of the loop impedance method. The circuit model is an electrical network composed of the tower grounding resistance and the ground wire resistance.

[0033] Step 3: Obtain the loop impedance test value of each base tower: when testing the loop impedance value, use the loop impedance method to test the loop impedance value of each base tower.

[0034] Step 4...

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Abstract

The invention discloses a tower grounding resistance calculation method based on the loop impedance test. By acquiring the basic information of the transmission line, a circuit model for the loop impedance test is established for each base tower. After obtaining the test value of the loop impedance of each base tower and the resistance value of each ground wire, the real value of the grounding resistance of the tower is approximated by an iterative method. The real value of the grounding resistance of the tower is obtained, which solves the problem of large error in the test results of the loop impedance method. The real value of the grounding resistance of the tower is calculated by using the test results of the loop impedance method, which is theoretically the solution of the multivariate high-order equation; The direct solution of high-order equations can quickly obtain approximate values ​​that meet the requirements of engineering errors, which is convenient and practical.

Description

technical field [0001] The invention relates to the technical field of tower grounding resistance testing, in particular to a calculation method for tower grounding resistance based on loop impedance testing. Background technique [0002] The test methods for tower grounding resistance mainly include three-pole method and loop impedance method. Among them, the loop impedance method does not require setting-out testing, which greatly improves the test efficiency and is the trend of tower grounding resistance testing. However, the test results of the loop impedance method not only include the grounding resistance of the tower itself, but also include the equivalent value of the grounding resistance and ground wire impedance of other towers in the test loop, and there is a certain error in theory. The actual test found that the test result of loop impedance may be several times larger than the real value of the grounding resistance of the tower, which seriously affects the rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/20
CPCG01R27/20
Inventor 雷潇张星海廖文龙刘强崔涛曾宏吴驰
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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