Device and method for testing influences of direct-current transmission line harmonic on noise of communication line

A technology of direct current transmission lines and communication lines, which is applied in the direction of line transmission monitoring/testing, line transmission parts, transmission monitoring, etc. It can solve the problems of difficulty in ensuring the accuracy of outdoor research and high research costs, and achieve the goal of improving accuracy and reducing costs Effect

Active Publication Date: 2013-04-03
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this research is generally carried out outdoors, and the research cost is relatively high. In addition, due to the influence of on-site temperature and humidity, the accuracy of outdoor research is difficult to guarantee.

Method used

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  • Device and method for testing influences of direct-current transmission line harmonic on noise of communication line
  • Device and method for testing influences of direct-current transmission line harmonic on noise of communication line

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0025] The test device for the influence of the harmonics of the DC transmission line on the noise of the communication line shown in Fig. , telephone set 5 and switch 6, wherein, the two ends of copper wire 3 are all connected with harmonic generator 4, and described resistance R1 is connected in series on copper wire 3, and one end of twisted-pair telephone line 2 is connected telephone set 5, double The other end of twisted telephone line 2 connects switch 6, and switch 6 is also connected with the far-end telephone set 7 that is arranged on the outside of electric wave anechoic chamber 1, and it also comprises that is used for replacing telephone set 5 and far-end telephone set 7 when testing. Two non-inductive resistors 8, and two noise meters 9 for respectively testing the equivalent noise electromotive force of the two non-inductive resis...

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Abstract

The invention relates to a designed device for testing influences of direct-current transmission line harmonic on noise of a communication line. The device comprises an anechoic chamber, a twin-twisted telephone line, a copper wire, a harmonic generator, a resistor R1, a telephone, an exchanger, two non-inductive resistors and two psophometers, the twin-twisted telephone line, the copper wire, the harmonic generator, the resistor R1, the telephone and the exchanger are arranged inside the anechoic chamber, two ends of the copper wire are both connected with the harmonic generator, the resistor R1 is serially connected on the copper wire, one end of the twin-twisted telephone line is connected with the telephone while the other end thereof is connected with the exchanger, the exchanger is further connected with a remote telephone arranged outside the anechoic chamber, the two non-inductive resistors are used for replacing the telephone and the remote telephone during test, and the two psophometers are used for testing equivalent noise electromotive force of the two non-inductive resistors respectively. By the device, the influences of the direct-current transmission line harmonic on the noise of the communication line can be tested indoors, and accordingly testing experiment cost is lowered, and precision of research results is improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility of high-voltage power transmission and transformation engineering, and specifically refers to a device and method for testing the influence of harmonics of direct current transmission lines on communication line noise. technical background [0002] During normal operation of the DC transmission line, a large number of harmonic voltages and harmonic currents in the audio range will be generated. Through inductive and resistive coupling, noise will be generated in the nearby audio telephone circuit and the quality of the call will be reduced. Since the 1970s, the "equivalent interference current" value has been widely used as the standard for limiting the level of DC harmonics. Since the human ear is most sensitive to sounds between the 12th and 24th characteristic harmonic frequencies, the reference frequency in my country is 800Hz. The establishment of the equivalent interfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/46H04B17/00H04B3/462
Inventor 干喆渊邬雄周兵李妮倪园陈豫朝裴春明万浩
Owner CHINA ELECTRIC POWER RES INST
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