Method for evaluating influence of DC magnetic bias on grounding grid of electricity system

A power system, DC bias technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of affecting the stability of the power system, reducing the reliability of the grounding system, and aggravating the electrochemical corrosion between metal and soil, etc., to achieve Reduce lightning tripping rate, improve reliability and high accuracy

Active Publication Date: 2015-04-01
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] DC bias greatly intensifies the electrochemical corrosion between metal and soil, reduces the reliability of the grounding system, increases the lightning tripping rate of the power system, and affects the stability of the entire power system operation
At present, a series of work has been carried out at home and abroad on the impact of DC bias on equipment, and a series of control measures have also been proposed. However, these studies and control measures are aimed at important equipment such as transformers.
At present, few scholars have studied the impact of DC bias on the power system grounding grid, and there is no effective evaluation method

Method used

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  • Method for evaluating influence of DC magnetic bias on grounding grid of electricity system
  • Method for evaluating influence of DC magnetic bias on grounding grid of electricity system
  • Method for evaluating influence of DC magnetic bias on grounding grid of electricity system

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Embodiment 1

[0026] Please refer to figure 1 , figure 1 A flow chart of the process of a method for evaluating the influence of DC bias on the power system grounding grid provided by the present invention, the method includes:

[0027] Step s101: Determine the grounding pole, power transmission line and tower, wherein the power transmission line is in a circle centered on the ground pole and the first preset value is the radius, and the poles and towers are all poles in the power transmission line;

[0028] It can be understood that the transmission line here can be any transmission line within a circle centered on the ground pole and the first preset value is the radius, because the DC bias has an influence on the transmission lines within a certain range around the ground pole. The towers here are all the towers on the transmission line inside the circle.

[0029] In addition, the first preset value here is artificially set, and the specific value can be determined according to the act...

Embodiment 2

[0045] Please refer to figure 2 , figure 2 It is a flow chart of the process of another method for evaluating the influence of DC bias on the power system grounding grid provided by the present invention. This method is an example specifically proposed on the basis of the method provided in Embodiment 1. The method includes:

[0046] Step s201: Determine the grounding pole, power transmission line and pole tower, wherein, the power transmission line is in a circle with the center of the ground pole circle and a radius of 50km, the power transmission line is arranged radially along the ground pole, and the pole towers are all pole towers in the power transmission line, with two The distance between the base tower and the grounding pole is 10km and 50km respectively, and the distance between every two base towers is 250m, a total of 160 base towers;

[0047] Further, the towers in the transmission line are numbered.

[0048] It can be understood that, in order to facilitate ...

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Abstract

The invention discloses a method for evaluating the influence of DC magnetic bias on a grounding grid of an electricity system. The method comprises the following steps: determining a grounding electrode, a power transmission line and pole towers, acquiring the parameters of the power transmission line in a circle and the parameters of the pole towers in the power transmission line, simulating in an electromagnetic field-circuit coupling manner according to the parameters and the information of the grounding electrode in combination with a moment method and a finite element method, obtaining the current value of each pole tower on a down lead, and then determining whether the current value exceeds the standard or not through judging whether the current value exceeds a standard electrochemical corrosion current threshold or not. The method for evaluating the influence of the DC magnetic bias on the grounding grid of the electricity system, provided by the invention, is simple in calculation, high in accuracy and efficiency and feasible. The method improves the reliability of the grounding system, reduces the lightning trip-out rate of the electricity system and improves the running stability of the whole electricity system.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation equipment, in particular to a method for evaluating the influence of DC bias on the grounding grid of a power system. Background technique [0002] UHV DC transmission technology originated in the 1960s, because it has the advantages of small transmission loss, large transmission capacity, saving line corridors, etc., and is suitable for the special national conditions of my country's energy and load distribution. East-to-East, north-south mutual supply, national networking" energy strategic plan is constantly advancing, and EHV and UHV DC transmission technologies have been widely used in my country. [0003] Under normal circumstances, the DC transmission line operates bipolar symmetrically, and in the case of line maintenance or failure, it adopts a more economical unipolar-to-earth return mode. When the DC unipolar ground loop runs or the DC bipolar power is unbal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 邹国平何文林龚若涵孙翔余睿陈斌陈易浩
Owner STATE GRID CORP OF CHINA
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