A Line Mutual Inductance Correction Method for Measuring Grounding Impedance of Overhead Lines
A technology of grounding impedance and line mutual inductance, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of complex zero-sequence mutual inductance and achieve the effect of improving accuracy
Active Publication Date: 2022-02-22
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
In the case of using overhead lines as current measurement leads and voltage measurement leads, the problem of zero-sequence mutual inductance between lines is more complicated, and there is currently no effective calculation method for reference
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[0055]In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.
[0056] Such as figure 1 As shown, the line mutual inductance correction method for measuring the grounding impedance of the overhead line in this embodiment includes:
[0057] 1) for k 1 +1 tower is divided into k 1 straight line segment P 1 ~P k1 overhead line l 1 , by k 2 +1 tower is divided into k 2 straight line segment Q 1 ~Q k2 overhead line l 2 , to obtain the overhead line l 1 , overhead line l 2 The ground impedance measurement value Z between;
[0058] 2) Calculate the overhead line l according to formula (1) 1 , overhead line l ...
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The invention discloses a line mutual inductance correction method for measuring grounding impedance of an overhead line, including 1 +1 tower is divided into k 1 straight line segment P 1 ~P k1 overhead line l 1 , by k 2 +1 tower is divided into k 2 straight line segment Q 1 ~Q k2 overhead line l 2 , to obtain the overhead line l 1 , overhead line l 2 The ground impedance measurement value Z between; calculate the overhead line l according to formula (1) 1 , overhead line l 2 The mutual inductance M between the leads is calculated according to Z'=Z‑M to obtain the corrected grounding impedance Z'. The present invention theoretically deduces and determines the theoretical model of mutual inductance of any line when using overhead wires for grounding measurement, calculates the mutual inductance M according to the theoretical model of mutual inductance of any line, and calculates the corrected grounding impedance Z' according to Z'=Z-M, thus effectively It solves the current problem of line mutual inductance correction using overhead lines to measure grounding impedance.
Description
technical field [0001] The invention relates to the technical field of grounding impedance measurement, in particular to a line mutual inductance correction method for measuring grounding impedance with overhead lines, which is used to measure the grounding impedance of a large grounding device by using two long-distance overhead lines to perform mutual inductance correction on the measurement results. Background technique [0002] In my country's electric power industry standard DL / T 475 "Guidelines for the Measurement of Grounding Device Characteristic Parameters", it is clearly mentioned the effectiveness of using overhead lines as current lines and voltage lines to measure the grounding impedance of super-large grounding devices. On the one hand, using the existing transmission line as the measurement lead can greatly reduce the wiring workload during the grounding measurement of large grounding devices and thus effectively speed up the measurement progress; on the other ...
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 何智强任章鳌李欣
Owner STATE GRID HUNAN ELECTRIC POWER