CN204835409U - Owner becomes and is qualified for next round of competitions with wall bushing and bottom plate structure - Google Patents

Abstract

A wall-piercing bushing and bottom plate structure for main transformer and outgoing line, which includes a bottom plate fixedly installed in the wall, on which a wall-piercing bushing is fixed, the bottom plate is a whole piece of rectangular steel plate, along the steel plate Three holes are distributed longitudinally, and the centers of the holes are on a straight line, and each hole is respectively fixed with a wall bushing by bolts; the bottom plate is a magnetic steel material; the magnetic permeability of the magnetic steel material used for the bottom plate is ≤ 1.05 High/Austrian, tensile strength ≥ 530? MPa, yield strength ≥ 255? MPa, the elongation rate θ is 30; the bottom plate is welded and fixed by the angle steel pre-buried on the wall, the shape and size of the holes set on the bottom plate and the distance between the three holes meet the size of the wall casing It is set according to the installation requirements; it has the characteristics of simple and firm installation structure, convenient and reliable use, and can effectively reduce the operating temperature to ensure the safe operation of the power grid.

Description

A wall-piercing bushing and base plate structure for main transformer and outgoing line

technical field

The utility model relates to a wall-piercing bushing and a bottom plate structure for main transformers and outgoing lines, and belongs to the technical field of high-voltage power transmission and distribution of electric power systems.

Background technique

With the rapid development of my country's economy and society, social electricity consumption is increasing year by year, and the output of the main transformer of the substation also increases with the increase of electricity consumption, which makes the current on the low-voltage side of the main transformer continuously increase. On the other hand, the continuous increase of power consumption by the majority of users has made the original designed main transformer capacity unable to meet the load demand, and must be increased. All of the above situations will increase the current at the low-voltage side of the main transformer of the substation, and the fixed bottom plate of the wall bushing on the low-voltage side of the main transformer will greatly increase the eddy current generated by electromagnetic induction, resulting in serious heating of the bottom plate, and the most serious temperature rise can even be as high as 150 degrees Celsius, which limits the actual power supply load of the main transformer and affects the safety of the power grid and the output of the main transformer. More importantly, the serious potential overheating of the equipment will endanger the safety of power grid equipment and personnel. 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 above-mentioned deficiencies, and provide a simple and firm installation structure, convenient and reliable use, which can effectively reduce the operating temperature and ensure the safe operation of the power grid.

The utility model is realized through the following technical scheme: a wall-through bushing and a bottom plate structure for the main transformer and outgoing line, which includes a bottom plate fixedly installed in the wall, and a wall-through bushing is fixed on the bottom plate. The base plate described above is a whole rectangular steel plate, three holes are longitudinally distributed along the steel plate, the centers of the holes are on a straight line, and each hole is respectively fixed with a wall-through sleeve by bolts; the base plate is made of 20Mn23AlV non-magnetic steel.

The bottom plate is made of 20Mn23AlV non-magnetic steel with a magnetic permeability of ≤1.05 high/ohm, a tensile strength of ≥530MPa, a yield strength of ≥255MPa, and an elongation rate δ of 30.

The bottom plate is welded and fixed by the angle steel pre-embedded on the wall. The shape and size of the holes on the bottom plate and the distance between the three holes are set to meet the size and installation requirements of the wall-through casing.

The bottom plate described in the utility model has excellent low magnetic permeability, which can greatly reduce the heating and power loss of the bottom plate of the through-wall bushing caused by eddy currents; it has high mechanical strength, and its performance parameters such as pulling strength, yield strength and elongation are uniform It is better than the wall bushing bottom plate currently used in the power transmission and distribution field of the power system; it is better suitable for the main transformer and the high voltage line wall bushing bottom plate in the high voltage transmission and distribution field of the power system, and solves the problem caused by the eddy current from the source. The heating problem caused by the bottom plate of the wall bushing reduces the power loss caused by the eddy current, improves the strength of the bottom plate of the wall bushing, and improves the power supply load level of the main transformer of the substation and the safety of the wall bushing operation.

The utility model belongs to an improvement of the prior art, and has the characteristics of simple and firm installation structure, convenient and reliable use, and can effectively reduce the operating temperature to ensure the safe operation of the power grid.

Description of drawings

Fig. 1 is a schematic diagram of the overall installation structure of the utility model.

Fig. 2 is a schematic diagram of the front installation structure of the base plate of the present invention.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings: as shown in Figures 1 and 2, the main transformer and the outgoing line described in the utility model use a wall-piercing sleeve and a base plate structure, which includes a wall that is fixedly installed in the body of wall 1 The bottom plate 2 is fixed with a wall-through casing 3. The bottom plate 2 is a whole piece of rectangular steel plate, and three holes 4 are distributed longitudinally along the steel plate. The centers of the holes 4 are on a straight line, and each hole 4 is used The bolt 5 is fixed with a wall-through sleeve 3; the base plate 2 is a non-magnetic steel, which is 20Mn23AlV non-magnetic steel, also called 20Mn23AlV high-manganese low-magnetic steel, and its chemical composition percentage is : C: 0.14~0.20, Mn: 21.5~25.0, AI: 1.50~2.50, Si: ≤0.50, S: ≤0.03, P: ≤0.03.

The bottom plate 2 is made of 20Mn23AlV non-magnetic steel with a magnetic permeability ≤ 1.05 high/ohm, which is only equivalent to the magnetic permeability of air and far lower than the relative magnetic permeability of conventional steel plates of 3000~5000, which limits the penetration of the wall from the source. The electromagnetic field generated by the large current in the bushing forms an eddy current in the bottom plate of the through-wall bushing, which fundamentally eliminates the generation of eddy current and the heating problem of the bottom plate of the through-wall bushing caused by the eddy current, so that the power supply load of the main transformer is no longer affected Heating limit of wall casing bottom plate; tensile strength ≥ 530MPa, yield strength ≥ 255MPa, elongation rate θ is 30.

The bottom plate 2 is welded and fixed by the angle steel 6 pre-embedded on the wall 1, so as to realize the support and fixation of the wall casing; the shape and size of the holes 4 set on the bottom plate 2 and the distance between the three holes It is set to meet the size and installation requirements of the wall bushing 3 .

Claims (3)

1. A wall bushing and base plate structure for main transformer and outgoing line, it includes a base plate fixedly installed in the wall, on which the wall bushing is fixed, and it is characterized in that the base plate is a whole piece Rectangular steel plate, three holes are distributed longitudinally along the steel plate, the centers of the holes are on a straight line, and each hole is respectively fixed with a wall-through sleeve by bolts; the bottom plate is made of 20Mn23AlV non-magnetic steel. 2. According to claim 1, the wall-piercing bushing and base plate structure for the main transformer and the outgoing line is characterized in that the base plate is made of 20Mn23AlV non-magnetic steel with a magnetic permeability ≤ 1.05 high/ohm, a tensile strength ≥ 530 MPa, and yielding Strength ≥ 255MPa, elongation rate δ is 30. 3. According to claim 1 or 2, the wall-piercing bushing and base plate structure for the main transformer and outgoing line, it is characterized in that the base plate is welded and fixed by the angle steel pre-embedded on the wall, and the shape of the hole set on the base plate is The dimensions and the spacing between the three holes are set to meet the size and installation requirements of the wall bushing.