CN205173729U - Low magnetism PMKD of wall bushing - Google Patents

Abstract

The low magnetic fixed bottom plate of the wall bushing includes a bottom plate that can be fixedly installed in the wall for fixing the wall bushing. The bottom plate is composed of a whole rectangular low magnetic steel plate, and the surface of the bottom plate There are three holes in the longitudinal direction for the insertion of the wall bushing, and the centers of the three holes are on the same straight line. At least three screw holes are evenly distributed around each hole, and there are holes for fixing the wall bushing. Bolts for the pipe; each of the three holes is welded with a bolt for connecting the casing of the through-wall bushing for grounding; four screw holes are evenly distributed around the three holes, and the holes are connected to the through-holes. A round hole suitable for the wall casing, and a positioning recess is arranged symmetrically up and down in the round hole; a rectangular slot hole for welding the ground flat iron of the bottom plate is provided at the bottom left of the bottom plate; it has a simple and firm installation structure, It is convenient and reliable to use, and can effectively reduce the operating temperature to ensure the safe operation of the power grid.

Description

Low magnetic fixed base plate for wall bushing

technical field

The utility model relates to a low-magnetism fixed bottom plate for a wall-piercing bushing, which belongs to the technical field of high-voltage power transmission and distribution in electric power systems.

Background technique

In recent years, with the rapid development of society, the industrial and residential power consumption of enterprises has risen sharply, so that the original designed main transformer capacity can no longer meet the load demand, and the capacity must be increased. Therefore, every summer, especially during the “summer peak” period of the power grid company, when the load of users increases greatly, the output of the main transformer increases, and the current at the low-voltage side of the main transformer increases accordingly, so that the wall bushing on the low-voltage side of the main transformer is fixed. The eddy current generated by the electromagnetic induction of the bottom plate is greatly increased, which leads to a particularly serious heating problem of the bottom plate. In addition, the hot ambient temperature in summer makes the bottom plate heat even more. When the ambient temperature is 35 degrees, the low-voltage side of the main transformer (10KV ) When the load current is around 2200A, its temperature can even be as high as 155 degrees Celsius. The voltage levels of the main transformer low-voltage side of the power system, such as 110, 35, and 10KV, are basically dry-type wall bushings with composite jackets. , the insulating material is generally vulcanized silicone rubber, and the applicable ambient temperature of the casing is -40 degrees to +40 degrees. If the temperature exceeds the range, the vulcanized silicone rubber is easy to age. When the temperature exceeds the limit value of 150 degrees, it is easy to break down and occur Grounding, short circuit and other safety accidents seriously endanger the safety of power grid equipment and personnel. At the same time, the backplane also limits the actual power supply load of the main transformer, which affects the safety of the power grid and the output of the main transformer, and has a huge impact on the reliability of power consumption of users. In addition, , The heating of the bottom plate also makes the electrical energy converted into thermal energy and is wasted in vain. But at present, in the entire power system, there is no reasonable and perfect treatment and construction plan for this problem, and there is no actual verification and comparison example.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a simple and firm installation structure, convenient and reliable use, which can effectively reduce the loss of electric energy caused by the eddy current generated by the alternating magnetic field around the wall bushing; Effectively reduce the operating temperature and ensure the safe operation of the power grid. The low-magnetic fixed bottom plate of the wall bushing is used for the incoming and outgoing wires.

The purpose of this utility model is accomplished through the following technical proposal, a low-magnetism fixed bottom plate for the wall-through casing, which includes a bottom plate that can be fixedly installed in the wall and used for fixing the wall-through casing. The bottom plate is composed of a whole rectangular low-magnetic steel plate. Three holes are longitudinally opened on the surface of the bottom plate for plugging in the wall bushing, and the centers of the three holes are on the same straight line, and the surroundings of each hole are evenly distributed. There are at least three screw holes on which bolts for fixing the wall bushing are arranged; one bolt for connecting the shell of the wall bushing to ground is welded under each of the three holes.

As a preference: there are four screw holes evenly distributed around the three holes, the holes are round holes suitable for the wall bushing, and the round holes are symmetrically provided with positioning recesses; The bottom left of the bottom plate is provided with a rectangular slot for welding the ground flat iron of the bottom plate; the four sides of the bottom plate are provided with welding edges for welding and fixing with the angle steel pre-embedded on the wall.

The utility model belongs to an improvement on the prior art. It has the advantages of simple and firm installation structure, convenient and reliable use, can effectively reduce the operating temperature to ensure the safe operation of the power grid, and at the same time saves the eddy current generated by the alternating magnetic field around the wall bushing. The characteristics such as the loss of electric energy caused.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings: As shown in Figure 1, a low-magnetism fixed bottom plate for a wall-through sleeve described in the utility model, which includes a piece that can be fixedly installed in the wall for fixing the through-hole The bottom plate 1 of the wall casing, the bottom plate 1 is composed of a whole rectangular low-magnetic steel plate, such as 20MN23AIV low-magnetic steel plate, three holes for plugging in the wall casing are provided on the surface of the bottom plate 1 along the longitudinal direction 2, and the centers of the three holes 2 are on the same straight line, especially on the central straight line; at least three screw holes 3 are evenly distributed around each hole 2, and bolts for fixing the wall bushing are arranged on it; Each of the three holes 2 is welded with a bolt 4 for connecting the casing of the through-wall bushing to ground.

As shown in the figure, four screw holes 3 are evenly distributed around the three holes 2 described in the utility model. Notched groove 5; the lower left side of the bottom plate 1 is provided with a rectangular slot 6 for welding the ground flat iron of the bottom plate; the four sides of the bottom plate 1 are provided with angle steel for welding and fixing with the pre-buried on the wall Welding edge used.

Claims (2)

1. The low magnetic fixed bottom plate of the wall-through casing, which includes a bottom plate that can be fixedly installed in the wall for fixing the wall-through casing, and is characterized in that the bottom plate is composed of a whole rectangular low-magnetic steel plate, The surface of the bottom plate is longitudinally opened with three holes for the insertion of the through-wall bushing, and the centers of the three holes are on the same straight line, and at least three screw holes are evenly distributed around each hole. The bolts used to fix the wall bushing; each of the three holes is welded with a bolt for connecting the shell of the wall bushing to ground. 2. The low-magnetism fixed bottom plate of the wall bushing according to claim 1, characterized in that there are four screw holes evenly distributed around the three holes, and the holes are compatible with the wall bushing. A round hole, the upper and lower symmetry of the round hole is provided with a positioning recess; the bottom left of the bottom plate is provided with a rectangular slot for welding the ground flat iron of the bottom plate; The angle steel on the body is used for welding and fixing the welding edge.