Vertical earthing electrode for transformer substation wire outlet earthing device
A vertical grounding electrode and line grounding technology, applied in the field of vertical grounding electrode and grounding electrode, can solve the problems of explosion of arrester, power frequency grounding resistance and impact grounding resistance exceeding limit, damage of main transformer winding, etc. The effect of slowing down corrosion, reducing power frequency grounding resistance and impact grounding resistance
Active Publication Date: 2014-09-10
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
At present, lightning strikes on 10KV lines often occur in the southern region. The reason is that the vertical grounding electrode in the grounding device of the 35KV / 10KV substation outgoing line (No. 1 pole) is corroded by the soil, and its power frequency grounding resistance and impact grounding resistance exceed the limit. If the surge arrester fails to discharge energy in time, the arrester explodes, which finally leads to the damage accident of the main transformer winding.
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Embodiment Construction
[0016] The present invention will be further described below in conjunction with the accompanying drawings.
[0017] see figure 1 , the figure shows the vertical ground electrode used in the substation outlet grounding device of the present invention, including the vertical ground electrode body 1 , leaf-shaped branches 2 and strip-shaped magnesium alloy sacrificial anode metal 3 . A number of leaf-shaped branches 2 are welded on the vertical ground electrode body 1. The material of the leaf-shaped branches 2 is the same as the metal material of the vertical ground electrode body 1. The leaf-shaped branches 2 are parallel to the vertical ground electrode body 1. Each leaf-shaped branch 2 The length is 0.5-0.6m, and the distance between the top of each leaf-shaped branch 2 and the top of the vertical grounding electrode body 1 is 0.6-0.9m; the vertical grounding electrode body 1 is connected with the strip-shaped magnesium alloy sacrificial anode metal 3, The strip-shaped magn...
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Abstract
The invention discloses a vertical earthing electrode for a transformer substation wire outlet earthing device. The vertical earthing electrode comprises a vertical earthing electrode body, and the vertical earthing electrode body is provided with a plurality of leaf-shaped branches in a welding mode. The leaf-shaped branches are made of the same materials as the metal materials of the vertical earthing electrode body. The vertical earthing electrode body is further connected with strip-shaped magnesium alloy sacrificial anode metal, and the strip-shaped magnesium alloy sacrificial anode metal is placed below the leaf-shaped branches. The vertical earthing electrode can reduce industrial frequency earthing resistance and impulse earthing resistance, and preventing and slowing the corrosion of the vertical earthing electrode by soil.
Description
technical field [0001] The invention relates to a grounding electrode, in particular to a vertical grounding electrode used for a substation outgoing line grounding device, and belongs to the technical field of electric power transmission. Background technique [0002] According to the requirements of DL / T620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations", overhead power lines of 35KV and below generally do not erect lightning conductors along the entire line. At present, lightning strikes on 10KV lines often occur in the southern region. The reason is that the vertical grounding electrode in the grounding device of the 35KV / 10KV substation outgoing line (No. 1 pole) is corroded by the soil, and its power frequency grounding resistance and impact grounding resistance exceed the limit. The surge arrester fails to discharge energy in time, and the arrester explodes, which finally leads to the occurrence of an accident of damage to the ...
Claims
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IPC IPC(8): H01R4/66
Inventor 季忠良
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO