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A Method for Evaluating the Impact of DC Bias on Power System Grounding Grid

A power system, DC bias technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that affect the stability of the power system, reduce the reliability of the grounding system, and aggravate the electrochemical corrosion between metal and soil, so as to reduce the The effect of lightning trip rate, improved reliability and high accuracy

Active Publication Date: 2017-09-15
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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  • A Method for Evaluating the Impact of DC Bias on Power System Grounding Grid
  • A Method for Evaluating the Impact of DC Bias on Power System Grounding Grid
  • A Method for Evaluating the Impact of DC Bias on Power System Grounding Grid

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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 bias magnetism on the grounding network of a power system. The information of the pole is simulated through the method of electromagnetic field field circuit coupling, combined with the method of moment and finite element method, and the current value of the down conductor of each tower is obtained, and then determined by judging whether the current value exceeds the standard electrochemical corrosion current threshold Whether the current value reaches the standard, a method for evaluating the influence of DC bias on the power system grounding network provided by the present invention has simple calculation, high accuracy, high efficiency, and is practical, which improves the reliability of the grounding system and reduces the power system. The lightning trip rate improves the stability of the entire power system operation.

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 Patents(China)
IPC IPC(8): G01N17/00
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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