KR20020068859A - Transformer for bush - Google Patents

Abstract

PURPOSE: A low voltage bushing is provided to allow bushing to be handled in a convenient and easy manner by reducing weight of the bushing, while achieving improved durability and reducing parts count. CONSTITUTION: A low voltage bushing(20) comprises a central conductor(25) having a second main body(24) with a terminal(27) formed integrally with the top of the second main body, wherein the second main body is made of an epoxy resin material; a first main body(23) made of an epoxy resin material; and a packing(29). The central conductor is coupled to a coupling hole formed at a transformer case. The first main body is positioned within the transformer case, and fixed by a nut(52). Since the second main body is formed integrally with the central conductor, the low voltage bushing has a reduced weight.

Description

Low pressure bushing for transformers {TRANSFORMER FOR BUSH}

The present invention relates to a low pressure bushing for a transformer, and more particularly, a low pressure bushing for outputting a power converted from a high pressure to a low pressure in a transformer for converting high voltage power into a low pressure to reduce the weight of the epoxy resin material. At the same time, the present invention relates to a low pressure bushing for a transformer, which prevents damage due to impact and improves workability by reducing the number of parts forming a low pressure bushing and prevents power loss.

In general, power supplied to homes or industrial sites is converted from a high pressure (22.900V) state to a low pressure (308 / 220V) state through a transformer, and then supplied. As a stop induction device that obtains the proper voltage of the same frequency to the secondary winding with the voltage supplied to the secondary winding, it has at least two electric circuits and one common magnetic circuit, and its structure is composed of an iron core mounted inside the case. In addition, the voltage input to the primary coil including the primary coil and the secondary coil, which are wound on both sides of the iron core, and the terminal block, is obtained at the secondary coil on the output side according to the winding ratio of the primary coil and the secondary coil. In this case, the input cable and the output cable are connected to the primary coil and the secondary coil by high pressure bushing and low pressure bushing, respectively.

1 is a longitudinal sectional view showing a conventional low pressure bushing for a transformer. The low pressure bushing 1 has a cylindrical shape in which a first body, a second body 3 and 4 having a through hole 2 in the center thereof, and both ends thereof. A terminal 7 having a screw thread formed therein, a terminal 7 having a cable high information bolt 6 coupled to the center conductor 5, an insulator 8 for insulation and a packing 9 for sealing. It is made up of.

The low pressure bushing 1 is inserted into and coupled to the coupling hole 11 formed in the transformer case 10 sequentially, and the first body 3 is positioned on the inner surface of the case 10 to be sealed by the packing 9. After the second body 4 is positioned so as to penetrate through the through hole 2 and the center conductor 5 is exposed to the outside, the outer surface of the case 10 is sealed by the packing (9), The center conductor 5 exposed to the outside through the through hole 2 formed in the center is inserted and the insulator 8 is positioned on the upper surface of the second body 4, and then the terminal 7 is connected to the center conductor 5. To be combined.

At this time, the packing (9) and the nut (12) is fitted to the central conductor (5) located on the inner surface of the case (10) to fix and couple the first body (3).

However, in the conventional bushings, that is, low pressure bushings, separate insulators for insulation and shock absorption are required, and the first and second bodies fixing the center conductor and the terminal are made of fraud, so they are easily vulnerable to impact and cracking. It is damaged and requires frequent replacement, and it is not easy to manage and handle. Also, since the low pressure bushing is made up of relatively many parts, it is difficult to manufacture and install, and also has many connection parts. / 220V) has a problem that the power loss occurs due to the connection at the output.

The present invention is to solve the conventional problems as described above, the object is to integrate a central conductor and a portion of the body portion for supporting and fixing the low-pressure bushing low-voltage power output from the transformer and excellent insulation and lightweight It is made of epoxy resin material of material that is not easily cracked and damaged against impact, so it is easy to handle and manage low pressure bushing and improve durability by reducing the number of parts and reducing weight. It is to provide a new type of low pressure bushing for transformers to prevent cracks and breakage, as well as to remove unnecessary connections to prevent power loss.

In order to achieve the above object, the present invention is a transformer for outputting power converted from high pressure to low pressure, the center conductor to which the low pressure is output and the terminal to which the cable is fixed integrally, the inside and outside of the case The first and second bodies are located in the epoxy resin material, the second body portion is integrally formed with the central conductor.

1 is a longitudinal sectional view showing a conventional low pressure bushing,

2 is a perspective view showing a low pressure bushing according to the present invention,

3 is a longitudinal sectional view showing a low pressure bushing according to the present invention;

Figure 4 is a front schematic diagram showing a low-pressure bushing coupled transformer according to the present invention,

5 is an enlarged cross-sectional view of a portion A of FIG. 4;

6 is a longitudinal sectional view showing another embodiment of the low pressure bushing according to the present invention.

<Explanation of symbols for the main parts of the drawings>

20: low pressure bushing 23: first body part

24; second body portion 25: the center conductor

Terminal 29: Packing

30: case 31: coupling hole

40: cable 41: terminal

50: transformer

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 to 5, the low pressure bushing 20 according to the present invention includes first and second body parts 23 and 24 located at inner and outer surfaces of the coupling hole 31 formed in the case 30. Support and fix the center conductor 25, the second body portion 24 is formed integrally with the center conductor 25, the center conductor 25 and the terminal 27 to which the cable 40 is fixed It is made in one piece.

At this time, the first and second body parts 23 and 24 located on the inner and outer surfaces of the case 30 are made of an epoxy resin material, and between the case 31 and the first and second body parts 23 and 24. In the seal packing 29 is fitted is fitted.

Figure 4 is a front schematic diagram showing a low-pressure bushing coupled transformer according to the present invention, the high-pressure bushing 42 on one side of the upper surface of the cylindrical case 30, the transformer member (not shown) is accommodated therein Coupled to, the low pressure bushing 20 is coupled to the coupling hole 31 formed at regular intervals on the outer circumferential surface.

At this time, since the organic coupling relationship between the high pressure bushing 42 and the low pressure bushing 20 is a conventional coupling relationship for voltage conversion, detailed drawing notation and description are omitted.

FIG. 5 is an enlarged cross-sectional view of the portion A of FIG. 4, in which a cable 40 for supplying power converted into a low pressure state to a terminal 27 integrally formed at an upper end of the center conductor 25 through which low pressure is output is provided. 41).

FIG. 6 is a longitudinal sectional view showing another embodiment of the low pressure bushing according to the present invention, in which a cable 40 for outputting and supplying power converted to low pressure by a transformer 50 is connected to form a contact point 27. ) Represents a double structure.

In the drawings, reference numeral 22 denotes a through hole, 51 denotes a hook, 52 denotes a nut, and 53 denotes a telephone pole.

Referring to the use state of the present invention as follows.

As shown in Figures 2 to 5, the terminal 27 is formed integrally on the upper end and the center conductor 25 formed integrally with the second body portion 24 made of an epoxy resin material and the epoxy resin material When the low pressure bushing 20 made of the first body 23 and the packing 29 for sealing are used to convert the high-voltage power to low pressure through the transformer 50 and supply it to a general home or industrial site. First, as shown in FIG. 5, the center conductor 25 is coupled to the coupling hole 31 formed in the case 30 of the transformer 50, but the first body part 23 is formed inside the case 30. After positioning, the through hole 22 formed in the center and fixed with a nut (52).

As such, when the first body portion 23 is in close contact with and fixed to the inner surface of the case 30 by the nut 52, the second body 24 integrally formed with the center conductor 25 is the case 30. As the center conductor 25 is supported and fixed to the case 30 as it is fixed while being pressed onto the outer surface, at this time, a packing for sealing between the first and second bodies 23 and 24 and the case 30 ( 29) is fitted.

In this state, when the cable 40 is fixed to the terminal 27 integrally formed at the upper end of the center conductor 25 by using the terminal 41, the power of the high voltage state is converted to low voltage by the transformer 50. It is supplied through the cable 40.

Since the low pressure bushing 20 is made of the central conductor 25 for outputting power in a low pressure state and the terminal 27 to which the cable 41 for power supply is fixed are integrally formed, unnecessary connection parts are removed to supply power. It is possible to prevent the power loss caused by the connecting part at the time and also to standardize the low pressure bushing 20 to have a certain size, regardless of the capacity of the transformer (10, 20, 30, 50, 75, 100, 150KVA) All of them can be used.

Meanwhile, as shown in FIG. 6, the plurality of cables 41 may be fixed together by having a dual structure of the terminal 27 integrally formed at the upper end of the center conductor 25 of the low pressure bushing 20. .

As described above, in converting and supplying high voltage power to low pressure through a transformer, the terminals for fixing the center conductor and the cable are integrally formed, and the first and second bodies located inside and outside the case are made of epoxy resin. Although the second body part is integrally molded with the center conductor, the low pressure bushing is light and easy to handle and manage, and has excellent durability against impact, so that it is not easily cracked and broken, and thus can be used semi-permanently. In addition, by reducing the number of parts forming low pressure bushing, it improves the manufacturing and workability, and removes unnecessary connection parts, thereby preventing the power loss caused by this.

Claims (1)

In the transformer for outputting power converted from high pressure to low pressure, The first and second body parts 23 and 24 located on the inner and outer surfaces of the case 30 to support and fix the center conductor 25 are made of epoxy resin material. The second body portion 24 is molded integrally with the center conductor 25, Low pressure bushing for a transformer, characterized in that the terminal 27 is fixed to the center conductor 25 and the cable 40 is fixed.