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Accurate measurement and calculation method for parameters of power transmission line

A transmission line, accurate measurement technology, applied in the direction of measurement device, measurement of electrical variables, measurement of resistance / reactance / impedance, etc. big error

Inactive Publication Date: 2012-01-18
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

[0035] The purpose of the present invention is to provide a precise measurement and calculation method of transmission line parameters, aiming at solving the problem of large error of transmission line parameters obtained in the existing measurement method as mentioned above, or the large amount of material and human resources consumed in the measurement process, and the measurement process There is a problem that the induced current and induced voltage affect the measurement results

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  • Accurate measurement and calculation method for parameters of power transmission line
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  • Accurate measurement and calculation method for parameters of power transmission line

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[0063] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0064] The precise measurement and calculation method of the transmission line parameters provided by the present invention is the result of further improvement on the basis of the existing measurement and calculation methods. The derivation process of the parameter measurement and distribution parameter calculation model of a long-distance transmission line provided by the present invention as follows:

[0065] After formula (5)×(6), we have:

[0066] Z'Y'=coshγD-1................................(15)

[0067] After rearranging formula (9), we get:

[0068] Z'=Z S (Z'Y'+1).................................(16)

[0069] After rearranging formula (10), we get:

[0070] Z O Y'(Z'Y'+2)=(Z'Y'+1)........................... ..(17)

[007...

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Abstract

The invention discloses an accurate measurement and calculation method for parameters of a power transmission line. In the method, the parameters of the power transmission line are accurately calculated according to short-circuit impedance ZS and open-circuit impedance ZO of the power transmission line. The method comprises the following steps of: measuring the short-circuit impedance ZS and the open-circuit impedance ZO of the power transmission line with length of D; acculate calculating characteristic impedance zc and propagation coefficient gamma of the power transmission line according to a calculation formula provided by the invention; further, calculating impedance z and admittance y under the condition of unit length of the line through the formulas of z=zc gamma and y=gamma / zc; and accurately calculating impedance Z' and admittance Y' of an equivalent pi circuit of the power transmission line according to the calculation formula provided by the invention. By adopting the measurement and calculation method provided by the invention, the accuracy for the parameters of the power transmission line can be greatly improved, manpower and material resources are saved, tide current of a power system is stably analyzed; protection setting is performed; and fault positioning is more accurate.

Description

technical field [0001] The invention relates to a parameter measurement technology and method of an electric power system, in particular to an accurate measurement and calculation method of transmission line parameters. Background technique [0002] Accurate transmission line parameters are crucial to power system power flow stability analysis, protection setting, fault location, etc. Since the birth of the power system, efforts to accurately measure transmission line parameters have never stopped. [0003] Transmission lines have the characteristics of distributed parameters: for the distribution parameters of transmission lines with length D, see figure 1 , Let the impedance z under the unit length be z=r+jωl, and the ground admittance y be y=g+jωc. According to the circuit principle, the two-port network equation of the long transmission line is: [0004] U · ...

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Application Information

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IPC IPC(8): G01R27/04
Inventor 肖遥李澍森钱海肖勇程江平陈禾
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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