CN209497005U - A kind of table leg formula grounded screen - Google Patents

Abstract

The utility model discloses a kind of table leg formula grounded screens, including horizontal grounding net and table leg formula earthing or grounding means, the horizontal grounding net corner is arc-shaped, horizontal grounding net is connect with electrical equipment, the table leg formula earthing or grounding means includes earthing pole and L-shaped horizontal grounding pole, the horizontal grounding pole is laid in enclosure wall foundation bottom and consistent with enclosure wall cutting depth, and the both ends of the horizontal grounding pole are respectively and fixedly connected with two earthing poles, and the top of earthing pole is connected with the corner of horizontal grounding net.The contact potential and step voltage of substation can be greatly reduced in the utility model, easy for construction, reduce unnecessary investment, practical, generated economic benefit and social benefit highly significant.

Description

A table leg type grounding grid

technical field

The utility model relates to a grounding grid, in particular to a table leg type grounding grid.

Background technique

In recent years, with the increase of the installed capacity of substations and the improvement of the voltage level of the power system, when a short-circuit accident occurs in the substation, the current into the ground is getting larger and larger, which requires more and more reliable, stable and economical operation of the substation. The greater the short-circuit current flowing into the ground, the greater the contact and step potentials. Once these two values exceed the allowable value, it is easy to cause major damage to the life safety of substation workers.

In order to solve this problem, the Chinese invention patent CN109449619A discloses a substation grounding grid, which includes a grounding body, a wiring layer is arranged at the center inside the grounding body, and ring-shaped steel strands at equal intervals are buried inside the wiring layer. The central position of the inside of the wiring layer is inlaid with an installation socket, the inside of the installation socket is provided with an insulating sleeve, and the inside of the insulation sleeve is provided with six sets of grounding wires, and the grounding wires are all connected with the ring steel strand The bottom end of the circular steel strand is fixed with a probe, and the bottom of the grounding body is poured with a filling layer, and the bottom ends of the probes all pass through the wiring layer and extend to the inside of the filling layer. The material inside the layer includes a paste-like physical type drag reducer. This invention realizes the function of reducing the resistance of the substation grounding grid, but the grounding grid is a stacked whole, which is bulky, difficult to construct, complicated in manufacturing process, expensive in cost and not universal.

Utility model content

In view of this, the purpose of this utility model is to provide a table-leg grounding grid for the deficiencies of the prior art, which solves the problems of difficult construction and poor versatility of the existing grounding grid, and achieves a great reduction in contact potential and the effect of the step potential.

In order to achieve the above object, the utility model adopts the following technical solutions:

A table-leg type grounding network, comprising a horizontal grounding network, the horizontal grounding network is connected with electrical equipment, and a table-leg type grounding device, the table-leg type grounding device includes a grounding electrode and a horizontal grounding electrode, and the horizontal grounding It is extremely L-shaped, and the two ends of the horizontal grounding electrode are fixedly connected to the grounding electrode, and the top of the grounding electrode is fixed to both sides of the corners of the horizontal grounding grid.

As a further improvement of the utility model, the corners of the horizontal grounding grid are arc-shaped.

As a further improvement of the utility model, the horizontal grounding grid is laid at a distance of 0.8m from the ground surface.

As a further improvement of the utility model, the horizontal ground electrode is laid on the bottom of the foundation of the enclosure wall.

As a further improvement of the utility model, the horizontal ground grid, the ground electrode and the outer surface of the horizontal ground electrode are provided with a conductive anti-corrosion layer.

The beneficial effects of the utility model are:

1. Compared with the conventional ground net, the utility model cancels the vertical ground electrode of the ground net, and only sets the grounding device similar to the table leg. When the fault current flows through the ground grid, it will usually generate high contact potential and step potential at the corners of the ground grid. Laying the table-leg grounding device on the foundation of the corner of the wall can greatly reduce the contact potential and step potential. step potential to ensure the personal safety of the staff, and it is easy to install, and it is common to all kinds of live devices that need grounding protection, and has strong practical value.

2. The corners of the horizontal grounding grid of the present invention are arc-shaped, which further reduces the contact potential and step potential of the horizontal grounding grid.

3. The horizontal grounding grid is laid at a depth of 0.8m underground, which complies with national regulations, ensures the safety of ground personnel, and has strong practicability.

4. The horizontal grounding grid, the grounding pole and the outer surface of the horizontal grounding pole are provided with a conductive anti-corrosion layer, which improves the service life of the utility model.

Description of drawings

Fig. 1 is the top view of the utility model;

Fig. 2 is a corner plan view of the utility model;

Fig. 3 is a corner side view of the utility model;

Fig. 4 is a corner perspective view of the utility model;

1-horizontal ground grid, 2-ground electrode, 3-horizontal ground electrode.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figures 1-4, a table-leg grounding grid includes a horizontal grounding grid 1 and a table-leg grounding device, the corners of the horizontal grounding grid 1 are arc-shaped, and the table-leg grounding device includes The ground electrode 2 and the L-shaped horizontal ground electrode 3 , the length of each side of the horizontal ground electrode 3 is the same as the radius of the arc at the corner of the corresponding horizontal ground grid 1 . When laying, the horizontal grounding electrode 3 is first laid at the bottom of the foundation of the fence, and the laying depth is consistent with the depth of excavation at the bottom of the foundation of the fence. After the laying of the horizontal grounding electrode 3 is completed, the ends of the two grounding electrodes 2 are respectively welded to the two ends of the horizontal grounding electrode 3, and finally the horizontal grounding grid 1 is laid. , it can also be a square grounding grid or a long-space grounding grid. The horizontal grounding grid 1 is laid at a distance of 0.8m from the ground surface, and each side is 1m away from the wall. There is at least one point connected to the electrical equipment on the horizontal grounding grid 1 , Weld the other ends of the two ground electrodes 2 to the corners of the horizontal ground grid 1 respectively. The horizontal ground grid 1, the ground electrode 2 and the horizontal ground electrode 3 are all galvanized steel. In order to improve the corrosion resistance of the utility model without affecting the electrical conductivity, the horizontal ground grid 1, the ground electrode 2 and the horizontal ground electrode 3 The outer surface is provided with graphite layer or carbon black layer.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model without limitation, other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the utility model, as long as they do not depart from the technical solution of the utility model The spirit and scope should be included in the claims of the present utility model.

Claims (5)

1. a kind of table leg formula grounded screen, including horizontal grounding net (1), the horizontal grounding net (1) connect with electrical equipment, special Sign is, further includes table leg formula earthing or grounding means, and the table leg formula earthing or grounding means includes earthing pole (2) and horizontal grounding pole (3), institute Stating horizontal grounding pole (3) is L shape, and the both ends of the horizontal grounding pole (3) are respectively and fixedly connected with earthing pole (2), the earthing pole (2) Top and the corner two sides of horizontal grounding net (1) are affixed.

2. a kind of table leg formula grounded screen according to claim 1, which is characterized in that the corner of the horizontal grounding net (1) In arc-shaped.

3. a kind of table leg formula grounded screen according to claim 1, which is characterized in that the horizontal grounding net (1) is laid in At earth's surface 0.8m.

4. a kind of table leg formula grounded screen according to claim 1, which is characterized in that the horizontal grounding pole (3) is laid in Enclosure wall foundation bottom.

5. a kind of table leg formula grounded screen according to claim 1, which is characterized in that the horizontal grounding net (1), earthing pole (2) and conductive erosion resistant coating is arranged in horizontal grounding pole (3) outer surface.