Distribution transformer grounding method

Abstract

The invention discloses a distribution transformer grounding method which comprises the steps that a transformer box wall is included, and a first lightning protection grounding wire is arranged at the bottom of a high-voltage side lightning arrester in a wire connection mode; a groove is formed in the end, away from the through hole, of the iron core flow guide copper bar, a protruding block is arranged on the side, close to the iron core flow guide copper bar, of the clamping block, and the first lightning protection grounding wire and the second lightning protection grounding wire sequentially pass through the rope penetrating hole and the groove and then are fixed to the wiring screw; a transition copper bar is clamped between the iron core flow guide copper bar and the transformer boxwall, and a gathering binding post is arranged on the iron core flow guide copper bar; and the ends, located in the inner cavity of the transformer box wall, of the high-voltage side grounding columnand the low-voltage side grounding column are each provided with a wiring annular groove. According to the distribution transformer grounding method, the position and the connection mode of the lightning arrester are reasonably set, effective lightning protection is achieved, the grounding column is convenient to install, the internal method can be detached and replaced independently, the requirement for stable connection after installation and clamping can be met, and the method is quite worthy of popularization.

Description

technical field [0001] This application is a divisional application of a Chinese invention patent application with the application date of February 24, 2020, the application number is 202010112087.7, and the title of the invention is a distribution transformer grounding structure. Background technique [0002] In the prior art, a superconducting transformer grounding method with the application number "201720726906.0" includes a utility pole, the inner side of the middle position of the utility pole is connected with a support plate by bolts, and a superconducting transformer is welded on the top of the support plate The shell, both sides of the bottom inner wall of the superconducting transformer shell are welded with winding posts, the outer wall of the winding post is wound with superconducting transformer coils, and the bottom inner wall of the superconducting transformer shell is welded with the first A terminal, the bottom of the support plate is welded with a connecti...

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Problems solved by technology

[0003] However, there are still relatively obvious defects in its use: 1. The above-mentioned grounding method cannot effectively prevent lightning, and the traditional grounding method of transformers is only to install the position of the arrester at will, but when the high-voltage side invades the lightning wave and causes the arrester to operate A large amount of inrush current flows on the grounding resistance. When the grounding resistance exceeds the regulations, the arrester cannot operate reliably, and the residual voltage of the arrester is very large, which will act on the high-voltage winding, causing the insulation reduction or breakdown of the high-voltage or low-voltage winding, which poses a safety hazard. ; 2. The above-mentioned device cannot ground the transformer box wall, and the contacts between the components are single connections, which are unstable and easy to loosen, which affects normal use; Jacking up requires setting up extended utility poles, which will not only increase the cumbersome installation and increase the cost, but also the utility poles need to support the overall weight of the transformer. The quality requirements for utility poles on large transformers are high and inconvenient to use

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