Method and device for reducing grounding impedance of transformer substation grounding grid by additionally arranging capacitor module

Abstract

The invention relates to a method and a device for reducing the grounding impedance of a transformer substation grounding grid by additionally arranging a capacitor module. The device comprises a plurality of capacitor grounding devices, wherein each capacitor grounding device comprises a plurality of capacitor units, an epoxy resin cylinder, a damp-proof sealing ring, a connecting conductor and ametal disc; and the capacitor units are connected in series to operate, the capacitor units are wrapped by the epoxy resin cylinders, the connecting conductors are used for connecting the capacitor units and penetrating through the epoxy resin cylinders, sealing rubber pads are used at the joints of the connecting conductors and the upper ends and the lower ends of the epoxy resin cylinders, andthe metal discs are used at the tail ends of the capacitor grounding devices. According to the method and device, the inductance component proportion of the grounding impedance of the transformer substation grounding grid is measured by using a grounding impedance testing instrument, the specific inductance value of the transformer substation grounding grid is obtained, then the number of the required capacitor grounding devices is obtained, after simulation calculation verification, the corresponding number of capacitor grounding devices are welded to the transformer substation grounding gridto reduce the inductance component of the transformer substation grounding grid, and the effect of reducing the grounding impedance of the transformer substation grounding grid is achieved.

Description

technical field [0001] The invention relates to a method and a device for reducing the grounding impedance of a substation grounding grid by adding a capacitor module, and belongs to the technical field of grounding grid reconstruction and detection. Background technique [0002] The grounding impedance is mainly composed of the inductive reactance on the grounding grid, the contact resistance between the grounding grid and the soil, and the diffusion resistance of the grounding grid. After the grounding impedance of the substation grounding grid exceeds the standard, the transformation of the grounding impedance of the grounding grid is often a project with a large investment, and some data show that the inductive component of the grounding impedance of the grounding grid decreases with the increase of soil resistivity, and increases with the area of ​​the ground grid. Therefore, in order to reduce the grounding resistance, measures such as increasing the area of ​​the grou...

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Problems solved by technology

After the grounding impedance of the substation grounding grid exceeds the standard, the transformation of the grounding impedance of the grounding grid is often a project with a large investment, and some data show that the inductive component of the grounding impedance of the grounding grid decreases with the increase of soil resistivity, and increases with the area of ​​the ground grid. Therefore, in order to reduce the grounding resistance, measures such as increasing the area of ​​the grounding grid and reducing the resistivity of the soil often increase the inductive component of the grounding grid, resulting in poor grounding impedance transformation of the grounding grid.

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