Method for in-situ test of broadband transmission line parameters of double-conductor type cable

A form of cable and in-situ testing technology, applied in the direction of measuring interference from external sources, measuring electricity, measuring devices, etc., can solve problems that cannot completely eliminate the influence of connectors and result deviations, and achieve convenient and fast testing. The effect of simple conditions

Active Publication Date: 2016-05-11
BEIHANG UNIV
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Problems solved by technology

[0007] The first type of method is suitable for ultra-long transmission lines in power systems. The frequency of transmission line parameters obtained is in the order of Hz, and the measuring device is not a standing instrument in the electromagnetic compatibility laboratory; the frequency of t

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  • Method for in-situ test of broadband transmission line parameters of double-conductor type cable
  • Method for in-situ test of broadband transmission line parameters of double-conductor type cable
  • Method for in-situ test of broadband transmission line parameters of double-conductor type cable

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[0059] Example

[0060] In the following, a specific embodiment is used to further explain the in-situ test and acquisition method of the broadband transmission line parameters of the dual-conductor type cable proposed by the present invention.

[0061] While explaining the method, in order to facilitate the verification of the proposed method, a coaxial line with a known model and complete information is selected for in-situ test acquisition of transmission line parameters. The tested cable is a 5-meter long coaxial cable with model RG179 in a certain system, and its parameter information is shown in Table 1. In this test, both ends of the tested cable are SMA male connectors; the calibration part port of the vector network analyzer is a 3.5mm female connector; the connection line is a 0.5-meter long coaxial cable of type RG316, two The end is an SMA male connector. An SMA female-to-female connector is required between the connecting wire and the cable under test to connect; t...

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Abstract

The invention discloses a method for an in-situ test of broadband transmission line parameters of a double-conductor type cable, and belongs to the technical field of electromagnetic compatibility. The method includes: a connecting line is connected to a vector network analyzer for calibration, one end of a tested cable is connected with the connecting line, the other end of the tested cable is connected with a calibration member, and the test of a single-port scattering parameter is conducted; then a double-port scattering parameter of the tested cable without eliminating the influence of connectors is calculated; and finally, the double-port scattering parameter without the influence of the connectors is obtained via a parameter optimization process, and the transmission line parameters of the tested cable can be calculated. According to the method, extra engineering amount brought by dismounting and re-installation of the installed cable can be avoided, and the test process is convenient and fast; and the influence of the connectors is eliminated so that the transmission line parameters of the cable can be accurately obtained in the frequency range of hundreds of MHz.

Description

Technical field [0001] The invention relates to a method for testing cable transmission line parameters. The acquired parameters are used in electromagnetic compatibility correction analysis and fault diagnosis related to cable coupling, and belong to the technical field of electromagnetic compatibility. Background technique [0002] Double-conductor cable refers to a broadband transmission line that transmits transverse electromagnetic waves or quasi-transverse electromagnetic waves, including parallel double wires, coaxial wires, single-core shielded wires, etc. Transmission line parameters refer to the propagation constant and characteristic impedance. [0003] When the equipment or system cannot meet the restrictions on electromagnetic interference, 90% is the reason for the cable (He Hong, Zhang Baofeng, Zhang Dajian, Meng Hui, etc. Electromagnetic compatibility and electromagnetic interference [M]. Beijing: National Defense Industry Press, 200744~45). Cable has become the m...

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Application Information

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IPC IPC(8): G01R27/32G01R27/04G01R31/00
CPCG01R27/04G01R27/32G01R31/001
Inventor 王珺珺宋欣蔚苏东林
Owner BEIHANG UNIV
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