Method for reducing potential difference in transformer substation grounding grid caused by impact current

A substation grounding grid and inrush current technology, applied in the high-voltage field, can solve problems such as poor economy, poor operability and accuracy, large reactance of a single copper bar, and failure to meet the design safety limit requirements, and achieve operability and high accuracy, reliable power supply, and the effect of ensuring national energy security

CN114709782APending Publication Date: 2022-07-05POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-07-05

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Abstract

The invention discloses a method for reducing potential difference in a transformer substation grounding grid caused by impact current, which is realized by laying a plurality of split copper bars in a cable trench of a transformer substation, and optimizes and selects reasonable split number and sectional area of the copper bars according to the potential difference condition in a secondary system grid. The method can effectively reduce the potential difference in the grounding grid of the transformer substation caused by the impact current, protects the reliable operation of a secondary system of the transformer substation, guarantees the safety of national energy, has obvious advantages in the aspects of economy, operability and accuracy, and provides reliable power supply for the development of national economy and society.
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Description

technical field

[0001] The invention belongs to the technical field of high voltage, and in particular relates to a method for reducing the potential difference in a substation grounding network caused by an impulse current. Background technique

[0002] Good grounding is the basic guarantee for the safe operation of the power system. When a short-circuit fault occurs with the substation or is struck by lightning, the inrush current entering the ground will cause safety problems such as ground potential rise, mesh potential difference, step potential, contact potential and secondary disturbance voltage, which will affect the safety of equipment and staff in the station. Threat, because the grounding body is not a good conductor, a large potential difference will also be generated on the grounding grid when a large current passes through it. There are a large number of scattered grounded equipment in the substation, and the ground potential difference will be applied to the ...

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Embodiment Construction

[0038] In order to make the purpose and technical solutions of the present invention clearer and easier to understand. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a par...