CN110221129B - Tower grounding resistance calculation method based on loop impedance test - Google Patents
Tower grounding resistance calculation method based on loop impedance test Download PDFInfo
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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Abstract
The invention discloses a tower grounding resistance calculation method based on a loop impedance test. And after the impedance test value of each base tower loop and the resistance value of each grade of ground wire are obtained, the actual value of the tower ground resistance is approached through an iteration method. The real value of the tower grounding resistance is obtained, the problem of large error of a test result of a loop impedance method is solved, the real value of the tower grounding resistance is calculated by adopting the test result of the loop impedance method, and a theoretical multiple higher order equation is solved; and the iterative method is adopted for calculation, so that the direct solution of a high-order equation is avoided, an approximate value meeting the engineering error requirement can be quickly obtained, and the method is convenient and practical.
Description
Technical Field
The invention relates to the technical field of tower grounding resistance testing, in particular to a tower grounding resistance calculation method based on loop impedance testing.
Background
The method for testing the tower grounding resistance mainly comprises a tripolar method and a loop impedance method. The loop impedance method does not need paying off test, greatly improves test efficiency, and is the trend of tower ground resistance test. However, the test result of the loop impedance method not only includes the grounding resistance of the tower itself, but also includes the equivalent values of the grounding resistance and the ground wire impedance of other towers in the test loop, and a certain error exists in theory. Actual tests show that the loop impedance test result may be several times larger than the actual value of the tower grounding resistance, and the reliability of the tower grounding resistance abnormity judgment is seriously influenced.
The loop impedance test loop is actually a complex electric network consisting of the grounding resistance and the ground resistance of each tower. The real value of the tower grounding resistance is calculated according to the loop impedance test value of each tower grounding resistance, and is actually the solution of a multiple higher order equation, so that a universal and simple calculation method is difficult to provide. Therefore, a tower grounding resistance calculation method for eliminating theoretical errors of a loop impedance test method is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a tower grounding resistance calculation method based on loop impedance test, so as to solve the problem of larger error of the loop impedance test result.
The invention is realized by the following technical scheme:
a tower grounding resistance calculation method based on a loop impedance test comprises the following steps:
s1: acquiring basic information of the power transmission line;
s2: aiming at each base tower, establishing a circuit model of the loop impedance of the power transmission line;
s3: acquiring a loop impedance test value of each base tower;
s4: calculating the resistance of each ground wire;
s5: and calculating the tower grounding resistance by adopting an iterative method.
Further, the basic information of the power transmission line includes the number of towers, the gear distance information and the ground wire model.
Furthermore, the circuit model of the transmission line loop impedance is an electric network formed by a tower grounding resistor and a ground wire resistor.
Furthermore, the loop impedance value obtained by the loop impedance method is adopted for the test value of the loop impedance of the power transmission line.
And further, calculating the resistance value of each grade of ground wire according to the span length and the type of the ground wire.
Further, the iterative method comprises the following steps:
s51, taking the loop impedance test value of each base tower as the initial value of the tower grounding resistance;
s52, calculating equivalent resistance values of other resistors of the loop in series-parallel connection except the self grounding resistor according to the circuit model of the loop impedance for each base tower;
s53, subtracting the equivalent resistance value calculated in the S52 from the initial value of the tower grounding resistance of each base tower to be used as an iterative calculation value of the tower grounding resistance;
s54, comparing the current iteration calculation value and the last iteration calculation value of each base rod tower grounding resistance, calculating error percentage and recording iteration times;
s55, if the difference of the error percentages of the two iterations before and after the tower grounding resistance is larger than sigma% and the iteration times are smaller than N, returning to S52, and iteratively calculating the tower grounding resistance; if the error percentages of the two iterations before and after the grounding resistance of all the towers are within sigma%, or the iteration times are more than or equal to N, ending the iteration, and entering S56;
and S56, the calculated value of the tower grounding resistance is the final iteration calculated value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the tower grounding resistance calculation method based on the loop impedance test, the real value of the tower grounding resistance is obtained, and the problem of large error of the test result of the loop impedance method is solved;
2. the invention relates to a tower grounding resistance calculation method based on a loop impedance test, which adopts a test result of the loop impedance method to calculate a real value of the tower grounding resistance and theoretically solves a multivariate higher-order equation; and the iterative method is adopted for calculation, so that the direct solution of a high-order equation is avoided, an approximate value meeting the engineering error requirement can be quickly obtained, and the method is convenient and practical.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a tower grounding resistance calculation flow chart of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, the tower ground resistance calculation method based on the loop impedance test of the present invention includes the following steps:
the method comprises the following steps: acquiring basic information of the power transmission line: and acquiring the number of the towers of the transmission line, the horizontal distance between two suspension points in a plane parallel to the specific load of the lead between two adjacent towers and the signal of the ground wire.
Step two: establishing a circuit model of the loop impedance of the power transmission line: and aiming at each base tower, establishing a circuit model tested by a loop impedance method, wherein the circuit model is an electric network formed by tower grounding resistance and ground wire resistance.
Step three: obtaining a loop impedance test value of each base tower: when the loop impedance value is tested, the loop impedance value of each base tower is tested by using a loop impedance method.
Step four: calculating the resistance of each ground wire: and calculating the resistance value of each grade of ground wire according to the span length and the type of the ground wire.
Step five: the tower grounding resistance is calculated by adopting an iterative method, and the method comprises the following specific steps:
step a: taking the loop impedance test value of each base tower as an initial value of the tower grounding resistance;
step b: calculating equivalent resistance values of other resistors of the loop in series-parallel connection except the self grounding resistor according to a circuit model of the loop impedance for each base tower;
step c: for each base tower, subtracting the equivalent resistance value calculated in the step b from the initial value of the tower grounding resistance to serve as an iterative calculation value of the tower grounding resistance;
step d: comparing the current iteration calculation value and the last iteration calculation value of each base rod tower grounding resistance, calculating error percentage, and recording iteration times;
step e: if the difference value of the error percentages of the two iterations before and after the tower grounding resistance is larger than 1% and the iteration times are smaller than 100, returning to the step b, and iteratively calculating the tower grounding resistance; if the error percentages of the two iterations before and after the grounding resistance of all the towers are within 1 percent, or the iteration times are more than or equal to 100, ending the iteration, and entering the step f;
step f: and the calculated value of the tower grounding resistance is a final iteration calculated value.
The method obtains the real value of the tower grounding resistance, and solves the problem of large error of the test result of the loop impedance method; calculating the real value of the tower grounding resistance by adopting a loop impedance method test result, and theoretically solving a multivariate higher-order equation; and the iterative method is adopted for calculation, so that the direct solution of a high-order equation is avoided, an approximate value meeting the engineering error requirement can be quickly obtained, and the method is convenient and practical.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A tower grounding resistance calculation method based on a loop impedance test is characterized by comprising the following steps:
s1: acquiring basic information of the power transmission line;
s2: aiming at each base tower, establishing a circuit model of the loop impedance of the power transmission line;
s3: acquiring a loop impedance test value of each base tower;
s4: calculating the resistance of each ground wire;
s5: calculating the tower grounding resistance by adopting an iterative method;
the iterative method comprises the following steps:
s51, taking the loop impedance test value of each base tower as the initial value of the tower grounding resistance;
s52, calculating equivalent resistance values of other resistors of the loop in series-parallel connection except the self grounding resistor according to the circuit model of the loop impedance for each base tower;
s53, subtracting the equivalent resistance value calculated in the S52 from the initial value of the tower grounding resistance of each base tower to be used as an iterative calculation value of the tower grounding resistance;
s54, comparing the current iteration calculation value and the last iteration calculation value of each base rod tower grounding resistance, calculating error percentage and recording iteration times;
s55, if the difference value of the error percentages of the two iterations before and after the tower grounding resistance is larger than 1% and the iteration times are smaller than 100, returning to S52, and iteratively calculating the tower grounding resistance; if the error percentages of the two iterations before and after the grounding resistance of all the towers are within 1 percent, or the iteration times are more than or equal to 100, ending the iteration and entering S56;
and S56, the calculated value of the tower grounding resistance is the final iteration calculated value.
2. The tower ground resistance calculation method based on the loop impedance test as claimed in claim 1, wherein the basic information of the transmission line is the number of towers, the gear distance information and the ground wire model.
3. The tower ground resistance calculation method based on the loop impedance test according to claim 1, wherein the circuit model of the transmission line loop impedance is an electric network consisting of a tower ground resistance and a ground wire resistance.
4. The tower ground resistance calculation method based on the loop impedance test according to claim 1, wherein the transmission line loop impedance test value is a loop impedance value obtained by a loop impedance method test.
5. The tower ground resistance calculation method based on the loop impedance test as claimed in claim 1, wherein the resistance value of each grade of ground wire is calculated according to the span length and the type of the ground wire.
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| KR100968046B1 (en) * | 2008-09-30 | 2010-07-07 | 한국전력공사 | Method for ground resistance measurement of transmission tower equipped with overhead groundwires |
| CN103792433B (en) * | 2014-02-21 | 2016-01-06 | 国家电网公司 | With the low amplitude value impulse resistance measuring method of spark coefficient correction tower grounding device |
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