Method and system for determining distribution of direct-current magnetic bias current of transformer substation
A technology of DC bias and current distribution, applied in control/regulating systems, regulating electrical variables, instruments, etc., can solve problems such as large errors, and achieve the effect of improving accuracy and ensuring safe and stable operation.
Pending Publication Date: 2022-08-09
宁夏宁电电力设计有限公司 +1
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The use of traditional isotropic horizontal layered soil structure often results in a large error between the calculated results of DC bias and the actual measured values
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[0062] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements / elements are given the same reference numerals.
[0063] Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal...
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The invention discloses a method and system for determining distribution of direct-current magnetic bias current of a transformer substation, and belongs to the technical field of lightning protection and grounding. The method comprises the following steps: subdividing soil, determining a plurality of surface element units, subdividing a grounding grid conductor, and determining a plurality of line element units; determining the original ground potential rise of the transformer substation; establishing an equivalent model of a direct-current magnetic bias current loop of the transformer substation according to the original ground potential rise, and establishing an equivalent model of a direct-current magnetic bias current loop of a power transmission loop; establishing an electric network equation according to the topological relation; and determining direct-current magnetic bias current distribution of the transformer substation around the grounding electrode according to the node voltage. According to the method, the anisotropic conductive medium can be considered, and the actual soil resistivity distribution structure of the ground can be simulated more accurately, so that the accuracy of direct-current magnetic bias evaluation and prediction can be improved, the site selection of the direct-current grounding electrode can be guided, and the safe and stable operation of a power grid can be ensured.
Description
technical field [0001] The present invention relates to the technical field of lightning protection and grounding, and more particularly, to a method and system for determining the distribution of DC bias current in a substation. Background technique [0002] When the HVDC transmission system operates in a single-pole mode, a strong DC current will be injected into the ground through the DC grounding pole, forming a constant DC current field in the surrounding soil. Since there are AC power grids such as substations and transmission lines distributed around the DC grounding electrode, the DC current injected into the earth will flow into the transformer windings of the substation through the resistive coupling between the DC grounding electrode and the surrounding substations, causing DC current to the transformer. The adverse effects such as bias magnetism will affect the safe operation of the transformer. [0003] In the process of selecting the location of the DC groundi...
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IPC IPC(8): G05F1/56
CPCG05F1/561Y02E60/60
Inventor 谭波郭骞任大江白汗章童雪芳王湘汉范冕李晓岚何慧雯彭庆华康文斌梅刚
Owner 宁夏宁电电力设计有限公司