Magnetic field differential method-based transformer substation grounding grid topology structure drawing method

Abstract

The invention discloses a magnetic field differential method-based transformer substation grounding grid topology structure drawing method. In the method disclosed in the invention, a pair of grounding grid down lead wires are chosen, one grounding grid down lead wire is used as a current injection point while the other grounding grid down lead wire is used as a current flow-out point, a constantcurrent I is injected into a grounding grid, a conductor branch circuit which intersects with a current flow-out point of the grounding grid down lead wire is drawn, a space rectangular coordinate system is built, branch circuit nodes along the drawn conductor branch circuit are determined, and a network model of a grounding grid can be preliminarily drawn; positions of other regular conductor branch circuits are determined according to the drawn conductor branch circuit, the The method is used for search along a line, quantities of sampling points can be reduced greatly, and branch circuit drawing processes are simple and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of substation grounding grid topology detection technology, in particular to a method for drawing the substation grounding grid topology structure based on a magnetic field differential method. Background technique [0002] As an important part of the power grounding system, the grounding grid mainly exists in power plants and substations. It is used for rapid discharge of large currents such as lightning currents, reduces ground potential rise, and prevents dangerous voltages from being generated. Due to limitations in resources, economy, technology, etc., metals such as carbon steel or galvanized flat steel are generally used as grounding materials in substations in my country. After a long period of operation, these metals will undergo electrochemical corrosion in the soil, which directly reduces the safety performance of the grounding grid. [0003] The existing grounding grid status monitoring and diag...

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Problems solved by technology

However, this method needs to measure the surface magnetic field in all possible grounding grid areas in the substation, and in order to obtain effective differential calculations, the distance between measurement points is required to be less than 5-10 cm, and the number of sampling points for on-site measurement is huge, so the measurement workload is huge , the grounding grid structure reconstruction efficiency is low

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