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Direct-current power transmission line radio interference excitation function testing method based on corona cage

A technology for DC transmission lines and radio interference, which is applied in the high voltage field, can solve the problems such as the lack of an equivalent method for testing the DC corona cage and the radio interference of transmission lines, and achieves the effect of short test time and shortened research period.

Active Publication Date: 2016-04-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the widely accepted Kaptzov assumption, after the conductor coronas, the electric field intensity on the conductor surface will remain constant at the corona field intensity, so it is not very appropriate to use the same maximum synthetic surface electric field intensity as the equivalent condition
[0004] It can be seen that the establishment of an equivalent method for radio interference testing of corona cages and transmission lines is the key to using corona cages to study radio interference problems, but so far, there is no effective equivalent method for radio interference testing of DC corona cages and transmission lines

Method used

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  • Direct-current power transmission line radio interference excitation function testing method based on corona cage
  • Direct-current power transmission line radio interference excitation function testing method based on corona cage
  • Direct-current power transmission line radio interference excitation function testing method based on corona cage

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Embodiment 1

[0053] Embodiment 1: as figure 1 Shown, the specific implementation method of the present invention is as follows:

[0054] S101. Calculate the capacitance C per unit length of the wire in the corona cage according to the parameters of the tested wire and the arrangement, the parameters of the corona cage, etc. c ;

[0055] C c = 2πε 0 / ln(R / r),(3)

[0056] In the formula, R is the radius of the corona cage, r is the radius of the wire, ε 0 is the permittivity of air.

[0057] S102. Taking the distance between the wire in the corona cage and the cage wall as the distance to measure, determine the position of the point around the wire of the transmission line and the distance between the wire and the transmission line that is equal to the measured distance, that is: determine that the shape of the wire around the transmission line is the same as that of the corona cage The position of the virtual box of ;

[0058] S103. Based on the electromagnetic field numerical calcul...

Embodiment 2

[0079] Embodiment 2: In order to verify the present invention, a scale model experiment system was set up in the laboratory, including a small corona cage experiment system and a scale circuit experiment system. The layout diagram of the experimental system and the electrical connection diagram of the corona cage experiment, such as Figure 2a , Figure 2b shown. Figure 2a , Figure 2b In the experimental system shown, the corona current of the corona cage and the scaled-scale line conductor are measured in the frequency domain by the coupling loop measurement system. In the experimental system, a high-voltage DC power supply causes a corona discharge on the wire. The high-voltage coupling capacitor of the coupling loop cooperates with the coupling circuit to couple the high-frequency component of the wire corona current to the low-voltage side. The coupling frequency is adjustable from 0.5MHz to 10MHz, and the impedance at the end of the coupling loop is 50Ω. The radio i...

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Abstract

The invention discloses a direct-current power transmission line radio interference excitation function testing method based on a corona cage. The method comprises the steps of: calculating capacitance per unit length of a wire in the corona cage, and with the distance between the wire and a cage wall serving as a measuring distance, determining positions of points around the power transmission line wire, from which the distances to the power transmission line are equal to the measuring distance; based on an electromagnetic field value calculating method, calculating a voltage generated on the position of each point, and calculating a voltage average value of values of the points; carrying out subtraction between the power transmission line wire voltage and the voltage average value, and obtaining an equivalent voltage between the wire and the corona cage; utilizing a coupling capacitor to couple a high frequency voltage of the wire in the corona to a low voltage end, and utilizing a radio interference receiver to measure a coupled voltage; and utilizing the couple voltage to obtain a radio interference excitation function of the power transmission line wire. According to the invention, the radio interference excitation function obtained in the corona cage can be directly used to a practical line, and correction and conversion are not needed.

Description

technical field [0001] The invention relates to the high-voltage technical field, in particular to a method for testing the radio interference excitation function of a direct current transmission line based on a corona cage. Background technique [0002] Corona discharge and the associated corona losses are one of the key considerations in the design, construction and operation of transmission lines. The source of corona loss is the corona discharge caused by the high electric field intensity on the surface of the wire. Therefore, to study the corona loss, it is necessary to monitor the voltage of the wire to ground and the corona discharge current of the wire at the same time. conduct observational research. Because corona discharge is greatly affected by factors such as season, climate, weather, altitude, etc., it takes years of statistical observations to obtain the influence of various factors on corona loss, and the results obtained are only applicable to the measurin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/001Y02E60/00
Inventor 张波王文倬尹晗何金良曾嵘胡军余占清庄池杰陈水明
Owner TSINGHUA UNIV
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