High-elevation correction method for lead critical coronal voltage of 750kV transmission line

A technology of corona inception voltage and transmission line, applied in the field of corona inception voltage altitude correction estimation of 750kV transmission line conductors, corona inception voltage elevation correction, and corona inception voltage elevation correction field of 750kV transmission line conductors, which can solve the problem of high uncertainty and accuracy It can improve the operation economy, reduce the error, optimize the wire structure and circuit design and other problems.

Inactive Publication Date: 2010-06-16
NORTHWEST CHINA GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the past, visual inspection was often used to judge the initial corona characteristics of electrical equipment. This method is greatly affected by the subjective factors of observers, with high uncertainty and poor accuracy.

Method used

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  • High-elevation correction method for lead critical coronal voltage of 750kV transmission line
  • High-elevation correction method for lead critical coronal voltage of 750kV transmission line
  • High-elevation correction method for lead critical coronal voltage of 750kV transmission line

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Embodiment Construction

[0025] figure 1 Instructions marked in: 1-1-corona cage measurement section; 1-2-corona cage protection section; 1-3-insulation support.

[0026] figure 2 Instructions marked in the middle: 2-1-resistance sampling unit; 2-2-remote module; 2-3-high voltage side A / D conversion module; 2-4-high voltage side digital signal; 2-5-electrical / optical conversion module ; 2-6-photoelectric energy conversion module; 2-7-optical fiber insulator; 2-8-local module; 2-9-signal processing circuit and D / A module; 2-10-optical / electrical conversion; 2-11 -laser; 2-12-power supply; 2-13-drive circuit; 2-14-output port.

[0027] image 3 Instructions marked in: 3-1-Measurement resistance conversion box; 3-2-High voltage capacitor voltage divider; 3-3-Voltage regulator; 3-4-Test transformer; 3-5-Small resistance for grounding; 3- 6-Computer for measurement.

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] The in...

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Abstract

The invention discloses a high-elevation correction method for the lead critical coronal voltage of a 750kV transmission line, comprising the following steps of: (1) obtaining a test critical coronal voltage U test according to a corona loss measurement curve; (2) establishing a correction model for the critical coronal voltage of the 750kV transmission line; and (3) substituting the test critical coronal voltage U test in the step (1) to the correction model for the critical coronal voltage in the step (2) to obtain elevation correction voltage. The elevation correction method for the critical coronal voltage of the 750kV transmission line as stated in the claim 1 is characterized in that the elevation correction model for the critical coronal voltage of the 750kV transmission line is shown as follows: Ucorrection=Utest *eAH or Ucorrection=Utest / 1-BH, wherein Ucorrection is correction voltages at the same elevation; Utest is the test critical coronal voltage; H is the elevation height km of a test site; and A and B are elevation correction parameters. The elevation correction mode can be used for the elevation correction of the lead critical coronal voltage of the 750kV transmission line, thereby achieving the goals of optimizing the lead structure and the circuit design and improving the running economy of the 750kV transmission line.

Description

technical field [0001] The invention belongs to the technical field of high voltage transmission lines, and relates to a correction method for corona onset voltage altitude, in particular to a correction method for corona onset voltage altitude of a conductor of a 750kV transmission line. It is also of great significance to the line design of 750kV transmission line conductor structure selection. Background technique [0002] Wire corona refers to the luminous discharge phenomenon caused by the ionization of the air around the wire after the surface potential gradient of the wire exceeds a certain critical value. There are always a certain number of positive ion-free electron pairs produced by cosmic rays in the air, and when the electrons are subjected to the action of an electric field, they will accelerate their motion. If the electric field is strong enough, these electrons gain enough energy to ionize the neutral molecules they collide with (impact ionization), thus cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 刘云鹏尤少华邢琳万启发孙强陈勇朱岸明黄宗君李润秋
Owner NORTHWEST CHINA GRID
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