A Corona Loss Testing Method for DC Transmission Lines Based on Corona Cage

A DC transmission line and corona loss technology, applied in the high voltage field, can solve the lack of effective data on the corona loss of the DC transmission line, there is no equivalent method for the DC corona cage and the transmission line corona, and it is impossible to predict the actual situation under DC Corona loss and other problems of the line, to achieve the effect of shortening the research period and the test time

Active Publication Date: 2018-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since there is no equivalent method between the corona cage experiment under DC and the actual line experiment established at home and abroad so far, it is impossible to predict the corona loss of the actual line under DC based on the corona cage experiment, so there is no DC transmission line at home and abroad so far. Valid Data for Corona Loss
The corona equivalent principle of corona cages and transmission lines is the key to using corona cages to study corona problems, but so far, there is no effective method for corona equivalents of DC corona cages and transmission lines

Method used

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  • A Corona Loss Testing Method for DC Transmission Lines Based on Corona Cage
  • A Corona Loss Testing Method for DC Transmission Lines Based on Corona Cage
  • A Corona Loss Testing Method for DC Transmission Lines Based on Corona Cage

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Embodiment 1

[0040] Embodiment 1: as figure 1 Shown, the specific implementation method of the present invention is as follows:

[0041] S101. Taking the distance between the wire in the corona cage and the cage wall as the distance, determine the position of the virtual frame around the wire of the transmission line on the drawing that has the same shape as the corona cage. The position of the virtual frame relative to the wire of the transmission line is equal to the corona The relative position of the cage to the wire;

[0042] S102. Determine the voltage generated by the transmission line conductor at the virtual frame based on the simulation calculation.

[0043] Based on the simulation calculation, the voltage generated by the transmission line conductor at each point of the virtual frame can be obtained. Since the electric field distribution around the actual line is not uniform, the voltages at different positions on the virtual box are slightly different. Simply taking the volt...

Embodiment 2

[0061] 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. exist Figure 2a , Figure 2b In the experimental system shown, the corona current of the corona cage and scaled-scale line conductors are measured in time domain by the current measurement system, and the average value is the corona current value. The wall of the corona cage can also be grounded through a 1MΩ resistor, and the voltage on the resistor can be measured to obtain the average current flowing through it, which is also the average value of the corona current. In the experimental system, the high-voltage DC power supply causes corona discharge on the wires. The time-domain measurement uses a high-speed a...

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Abstract

The invention discloses a DC power transmission line corona loss test method based on a corona cage. The DC power transmission line corona loss test method comprises the steps of determining the position of a virtual frame which is at the periphery of a power transmission line lead and has a shape that is same with that of the corona cage in a manner that the distance between the lead and the cage wall in the corona cage is used as a measuring distance, determining the generated voltage of the power transmission line lead at the virtual frame based on simulation computing, subtracting the generated voltage at the virtual frame from the voltage of the power transmission lead for obtaining an equivalent voltage which is applied between the lead in the corona cage and the corona cage, applying the equivalent cage between the lead in the corona cage and the corona cage, measuring the current of the lead between the corona cage wall and a grounding point, and multiplying the measured corona loss current with the voltage of the power transmission line lead, thereby obtaining the corona loss of the power transmission line lead. According to the DC power transmission line corona loss test method, the experiment result of the corona loss in the DC corona cage can be directly applied on an actual line without any modification or conversion.

Description

technical field [0001] The invention relates to the technical field of high voltage, in particular to a method for testing corona loss of direct current transmission lines 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 measuring wires and given voltages; f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
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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