A Calculation Method of Grounding Resistance of Artificial Grounding Body

Abstract

The invention discloses an artificial grounding body grounding resistance calculation method. The method comprises the following steps: regarding soil particles as soil particle spheres; and regardingan electric field formed by the vertical grounding body and surrounding soil as a cylindrical hemispheroid; transversely cutting a hemispheroid with the radius of rki of the soil particle sphere inton equal parts, wherein the equal height of each part is h; transversely cutting the hemispheroid into n equal parts which are regarded as n cylinders, wherein the radius of each cylinder is rzj; thebottom area and the radius of the jth cylinder from bottom to top are Sj and rzj respectively; constructing a resistance calculation model Rki of spheres with different soil particle resistivity; respectively calculating the sphere volume VQi of the soil particles, the hemisphere soil volume VTi of the electric field cylinder and the quantity Ni of the soil particles; constructing a soil resistance calculation model Rti of different soil resistivity; constructing different soil resistivity grounding resistance calculation models RJi according to the model Rti and the grounding body resistanceRT; the problem that the calculation error is large when the ground body grounding resistance is calculated in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of artificial grounding, and in particular relates to a method for calculating the grounding resistance of an artificial grounding body. Background technique [0002] In the low-voltage power distribution network, the grounding resistance of the neutral point on the low-voltage side of the distribution transformer directly affects the power quality of the power users, the contact voltage of the operation and maintenance personnel and other personnel, the insulation degree of electrical equipment, and the three-phase balance of operation. And other issues. At present, the calculation method of the grounding resistance of the artificial grounding body is mainly: the formula empirical method. [0003] For example, the formula for calculating the grounding resistance of a vertical grounding body: Among them, ρ is the resistivity of the soil, l is the buried depth of the grounding body, and d is the diameter o...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for calculating the grounding resistance of an artificial grounding body to solve the problems of large calculation errors in calculating the grounding resistance of the grounding body in the prior art

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