KR200330110Y1 - Pole transformer bushings - Google Patents

Abstract

The present invention relates to a low pressure bushing for columnar transformer,

Instead of eliminating the conventional locking grooves or locking projections respectively formed on the outer pipe and center conductor of the low-pressure bushing for columnar transformers, the rubber packing is inserted between the outer pipe and the center conductor for shock absorption and sealing effect. In addition to preventing rainwater from entering, the prevention of accidents and workability can be greatly improved, and the conductor inserting portion of the clamp bolt is formed in a ring shape so that the conductor can be easily inserted, the assembly state is stable, and the deformation is less reused. It is also possible to greatly increase the assembly and workability is characterized in that.

Description

Pole transformer bushings for column transformers

The present invention relates to a low pressure bushing for a column transformer, in particular, a rubber packing is inserted between the clamp terminal of the low pressure bushing and the outer duct to prevent the duct from being broken, while improving the structure of the conductor insertion portion of the clamp bolt, thereby improving workability. A low pressure bushing for columnar transformers can be greatly improved.

In general, a transformer that converts a receiving voltage into a voltage suitable for operation of a load facility in order to lower the high voltage for a factory or a low voltage for a home from a substation receives a AC power from a primary terminal and modifies the voltage and current by an electromagnetic induction action. To supply AC power of the same frequency to the secondary terminal.

These transformers are classified into columnar transformers installed on the poles of the ground and underground transformers installed in the ground in the underground wiring method. The transformers are slightly different depending on the specific use, but the basic configuration is almost the same.

In the transformer, a bushing (insulator) is installed at a portion where a high voltage is substantially introduced. The high pressure side is divided into an extra high pressure bushing and a high pressure bushing according to the insulation class, and the low pressure side is divided into a low pressure bushing.

As shown in FIG. 1, a conventional low pressure bushing for a columnar transformer has a magnetic outer pipe 20, which is a solid insulator, on the upper side (transformer outer side) around the enclosure 10, and a lower side (inside the transformer). A magnetic inner inner pipe 30, which is a solid insulator, is installed, and the outer outer pipe 20 and the inner inner pipe 30 are connected to the clamp terminal 40 inserted through the inner center thereof. Insulating oil filled inside the transformer is fixed to the enclosure 10 by the fastening member 44 screwed to the end, and both sides of the enclosure 10 in which the outer pipe 20 and the inner pipe 30 are assembled. Packing 51 and 53 are inserted to prevent the leakage of water to the outside, and the clamp terminal 61 is provided with a clamp bolt 61 provided with a conductor assembly 64 in a direction perpendicular to the clamp terminal 40. To the conductor assembly 64 by a fastening nut 62 screwed to the other end of the bolt 61. The conductor 70, such as an electric wire, to be fitted is fixed.

However, in the related art, a separate groove that determines a fastening position in the outer pipe 20, that is, a pair of locking grooves 22 facing each other is formed on the upper side of the outer pipe 20, and the locking groove is formed in the center conductor 41. By forming a pair of engaging projections 42 corresponding to the 22, the engaging projections 42 are configured such that the engaging grooves 22 are combined with each other, which is complicated in structure, and catches the engaging projections 42 during operation. Since the fastening work should be performed in a state seated in the groove 22, there was a hassle.

In addition, there is a problem that the bent tube is broken when excessively increasing the fastening force of the fastening member 44 in a state in which their engagement state is somewhat incomplete, and the fastening state is uniform by judging the fastening force of the fastening member 44 with the naked eye. There is a drawback to not doing it.

In order to solve this problem, when the fastening force of the fastening member 44 is weakened, a gap is generated between the clamp terminal 40 and the outer conduit 20, and rainwater flows into these gaps, which may cause leakage. The contact state of the packings 51 and 53 is also loosened, so that the sealing is not effectively performed, which causes another problem that the insulating oil inside the transformer leaks to the outside.

In addition, the conductor inserting portion 64 of the clamp bolt 60 assembled to the clamp terminal 40 has a rhombus shape, and not only the task of inserting the end of the conductor 70 into the conductor inserting portion was not smooth, but also the conductor There is a phenomenon that the 70 is pushed in one direction, and the portion inserted into the conductor insertion portion 64 is pressed flat when the tightening force of the nut is applied, so that the used shape of the conductor is deformed to reuse the once used conductor. There is a hassle to use after restoring to a state.

In addition, the patriots often broke when they were repeatedly contracted or expanded due to temperature differences.

The conventional problem as described above is to form a locking projection 42 and the locking groove 22 corresponding to each other on the outer pipe 20 and the center conductor 41 to have a directionality to check their coupling state In addition, the shape of the conductor insertion portion 64 formed in the clamp bolt 60 is a rhombus shape, and was caused by not having a configuration that can cope with shrinkage or expansion.

The present invention is intended to solve the above problems in view of the above-described problems, the present invention is to eliminate the conventional catching grooves or catching projections respectively formed on the outer pipe and the clamp terminal between the outer pipe and the clamp terminal. By inserting the rubber packing to achieve shock absorbing and sealing effect, it is possible to maintain a constant clamping force and to prevent rainwater from entering, thus providing a low pressure bushing for column transformers, which can greatly improve accident prevention and workability. It is.

In addition, the present invention is to improve the structure of the conductor insertion portion formed in the clamp bolt to stabilize the assembly state of the conductor, even if the tightening nut is screwed to the clamp bolt is configured so that the conductor insertion portion is inserted into one circle The present invention provides a low-pressure bushing for columnar transformers in which the conductors can be reused and the workability can be greatly increased by preventing the conductors from being greatly deformed.

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

1 is a partial cross-sectional view showing a low pressure bushing according to the prior art.

Figure 2 is an illustration of a low pressure bushing for columnar transformer according to an embodiment of the present invention.

3 is a partial cross-sectional view of a low pressure bushing for columnar transformer according to an embodiment of the present invention.

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

10: enclosure 20: outer outer pipe

30: inner inner tube 40: clamp terminal

41: center conductor 44: fastening member

51,53: Packing 60: clamp bolt

64: conductor assembly 70: conductor

80: rubber packing

Figure 2 is an illustration of a low pressure bushing for columnar transformer according to an embodiment of the present invention, Figure 3 shows a partial cross-sectional view of a low pressure bushing for columnar transformer according to an embodiment of the present invention.

As shown in the low pressure bushing for the columnar transformer, the outer outer casing 20 and the inner casing 30, which are solid insulators with the packings 51 and 53, are positioned on both sides of the transformer enclosure 10. The outer pipe 20 and the inner pipe 30 are fixed to the enclosure 10 by a fastening member 44 screwed to the center conductor 41 of the clamp terminal 40 penetrated to the inner center thereof, and the clamp One end of the terminal 40 is assembled with a clamp bolt 60 having a conductor insert 64 orthogonal to the conductor insert by a tightening nut 62 screwed into the other end of the clamp bolt 60. Fixing the conductor 70, such as an electric wire inserted into 64, is the same as before.

However, in the present invention, the rubber packing 80 made of an elastic body is inserted between the outer pipe 20 and the clamp terminal 40 so that the rubber packing 80 is transferred to the outer pipe 20 and the clamp terminal 40. It is characterized in that it is configured to achieve a sealing effect to prevent the shock absorption and rain water is introduced.

The rubber packing 80 is made of elastic rubber or synthetic resin and engineering plastics having similar properties to the material to absorb a shock acting between the outer pipe 20 and the clamp terminal 40. As shown in FIG. 3, a ring-shaped (thickness) or an extension portion 82 is formed to form a step to the lower side of the rubber packing 80 and the length is extended so that the extension portion 82 is the center conductor 41. It can be configured to partially wrap.

As such, the rubber packing 80 is formed in one piece in which the extension portion 82 is protruded to the lower side of the ring shape having a predetermined thickness, so that the center conductor 41 is also enclosed together to form the outer pipe 20 and the clamp terminal 40. The rubber packing 80 inserted therebetween can be prevented from flowing left and right, so that the center position can be easily adjusted.

In addition, according to the present invention, the conductor insertion portion 64 of the clamp bolt 60 assembled to the clamp terminal 40 is configured in a ring shape having a diameter approximately larger than that of the conductor 70, and the conductor insertion portion 64 ), The opposing surface 48 of the opposite clamp terminal 40 to be assembled is formed into a hemispherical shape having the same diameter as the conductor insertion portion 64 so as to face the conductor insertion portion 64 into which the conductor 70 is inserted. It is characterized by that 48 is configured to form a circle.

As described above, the low pressure bushing for the columnar transformer according to the present invention includes both the outer pipe 20 and the inner pipe 30 together with the packings 51 and 53 on both sides of the enclosure 10, that is, on both sides of the through-hole. After positioning, the packing 80 is assembled to the center conductor 41 of the clamp terminal 40, and then the front end of the center conductor 41 is pushed through the center of the outer conduit 20.

The center conductor 41 is then penetrated into the centers of the packings 51 and 53 and the inner shell 30 assembled to both sides of the enclosure 10, and the center conductor 41 penetrates to the lower side of the inner tube. When the fastening force is gradually increased while screwing the fastening member 44 to the front end, both packings 51 and 53 inserted between the outer pipe 20 and the inner pipe 30 are in intimate contact with the enclosure 10. The insulating oil inside the transformer can be prevented from leaking to the outside.

At this time, the rubber packing 80 is inserted into the center conductor 41 is located on the clamp terminal 40 side and the upper side of the outer tube 20 can be prevented from entering rainwater through these parts.

And the rubber packing 80 is inserted between the clamp terminal 40 and the outer shell 20 to prevent them from directly contacting even if the fastening force of the fastening member 44 fastened to the center conductor is increased, so that the love tube is easily broken. Can be prevented.

In addition, the rubber packing 80 has the advantage that it is possible to effectively prevent the breakage of the insulator by being able to effectively cope with the temperature change by repeated expansion and contraction when the insulator is stretched and expanded due to the high temperature.

The present invention improves the conductor insertion portion 64 formed in the clamp bolt 60 from the existing rhombus shape to a complete ring shape, and inserts the inner surface 48 opposite to the conductor insertion portion 64. It is formed in a hemispherical shape having the same diameter as the portion 64, even if the tightening nut 62 is screwed to the clamp bolt 60, the conductor insertion portion 64 and the inner surface 48 into which the conductor 70 is inserted It is close to this circle, and thus the phenomenon in which the conductor 70 is greatly pressed as in the conventional art can be prevented, so that the conductor 70 can be reused.

In addition, since the conductor insertion portion has a circular shape, the insertion of the conductor 70 can be made more easily, and the fixed state of the conductor 70 is very stable.

As described above, the low pressure bushing for the columnar transformer according to the present invention, since the rubber packing is installed between the clamp terminal and the outer duct to be assembled in the transformer enclosure, it is possible to prevent the rain water from entering into these areas, The rubber packing is made of an elastic body to absorb the fastening force of the fastening member and to effectively cope with expansion and contraction due to the high temperature, thereby preventing damage to the love tube.

In addition, the low pressure bushing for columnar transformer of the present invention does not form a locking projection or a locking groove in the outer insulator and clamp terminal as in the prior art, so the structure is simple and easy to manufacture, and the conductor inserting portion 64 of the clamp bolt 60 is provided. It is a very useful design having an effect such as assembly and workability is greatly increased by forming a ring shape to facilitate the insertion of the conductor (70).

Claims (2)

The outer outer pipe 20 and the inner pipe 30 are placed on both sides of the columnar transformer enclosure 10 together with the packing 51 and 53 and the magnetic outer pipe 20 and the inner pipe 30 which are solid insulators. It is fixed to the enclosure 10 by a fastening member 44 screwed to the center conductor 41 of the clamp terminal 40 penetrated into the inner side of the clamp terminal 40, the conductor insertion portion 64 at one end of the clamp terminal 40 ) Is mounted to clamp the conductor (70) inserted into the conductor insertion portion (64) by a clamping nut (62) assembled with a clamp bolt (60) screwed to the other end of the clamp bolt (60). In low pressure bushing for transformer, The rubber packing 80 made of an elastic body is inserted between the outer pipe 20 and the clamp terminal 40, and the rubber packing 80 forms an extension part 82 that extends to a lower side thereof. Low pressure bushing for columnar transformer, characterized in that 82 is configured to partially wrap the center conductor (41). The conductor clamping portion (40) of claim 1, wherein the conductor inserting portion (64) of the clamp bolt (60) has a ring shape having a diameter larger than that of the conductor (70), and the mating clamp terminal (40) to which the conductor inserting portion (64) is assembled. ) Is formed in a hemispherical shape having the same diameter as the conductor inserting portion 64 so that the conductor inserting portion 64 into which the conductor 70 is inserted and the opposing surface 48 form one circle. Low pressure bushing for columnar transformer, characterized in that.