JPH10256044A - Oil transformer adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a shield ring from being removed owing to vibration by sealing the inner-periphery center part of a cylindrical shield ring to a fixed terminal via a ring-shaped support metal fitting. SOLUTION: A fixed terminal 9 is connected and fixed to the upper-edge part of a conductor-extraction rod 2 that projects into an insulation oil 8 from the upper edge of a thimble 4 of an oil transformer adapter 1. A shield ring 14 is fixed to the fixed terminal 9 via a support metal fitting 13. The shield ring 14 is obtained by curving both edges of a cylindrical copper plate toward the inside. Also, the support metal fitting 13 is obtained by forming the copper plate in a ring shape and at the same time forming a cylindrical part 13b with a short axial length at the outer periphery of a ring-shaped support part 13a. Then, the outer-periphery surface of the cylindrical part 13b of the support metal fitting 13 is welded and fixed to the inner-periphery center part of the shield ring 14. Also, a flange part 9a is formed at the center part of the fixed terminal 9, and the flange part 9a and the inner-periphery edge part of the support part 13a of the support metal fitting 13 are overlapped before being sealed by a bolt 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible transformer adapter for connecting a submersible transformer used in an emergency to a transport cable.

[0002]

2. Description of the Related Art In the case where a service facility failure occurs in a substation yard, a mobile transformer may be connected to apply power to equipment. For example, in the case of a substation as shown in FIG. 5, a transmission power of 77 kV drawn from the overhead line 23 via the aerial terminal 24 to the in-gas terminal 26 by the CV cable 25 is transmitted to the bus side of the in-gas terminal 26 By connecting the moving transformer 21 via the moving cable 22, the voltage is reduced to 6 kV and supplied to the equipment 27. Here, the moving transformer 21 is provided with an elephant case 7, and the elephant case 7 is filled with insulating oil. Then, it is connected to the terminal of the moving cable 22 via the oil-in-oil transformer adapter 1 attached to the connection part of the elephant case 7.

FIG. 6 shows a configuration of a conventional transformer adapter 1 in oil. A bottom plate 7a is provided at a connection portion of the elephant case 7.
Are fixed by welding, the transformer adapter 1 in oil is fitted into the opening of the bottom plate 7a, and the fixing adapter 6 and the presser plate 5 fix the transformer adapter 1 in the oil.

[0004] The transformer adapter 1 in oil comprises a conductor lead rod 2
And a conductor connector 3 connected to and fixed to this, and a periphery of which is covered with an insulating sleeve 4 made of substantially spindle-shaped epoxy resin. The conductor pull-out bar 2 is a conductor made of a copper conductive material disposed on the upper side of the axial center of the sleeve 4 in the drawing, and projects further upward from the upper end of the sleeve 4. The conductor connector 3 is disposed substantially at the center of the axis of the sleeve 4, and has an upper end connected and fixed to a lower end of the conductor pull-out bar 2 and a fitting connection hole 3 a opened at the lower end surface. It is a conductor made of a conductive material. A connection port 4b having a tapered hole at the lower end surface is opened in the sleeve 4, and the conductor connector 3 is located at the back of the connection port 4b.
The fitting connection hole 3a is opened. Then, the flange portion 4a on the outer periphery of the sleeve 4 is sandwiched between the holding plate 5 and the mounting bracket 6 and fixed with bolts 18, and the mounting bracket 6 is fixed to the bottom plate 7a with bolts 19 to connect the elephant case 7. Attached to the opening.
The mounting bracket 6 seals the space between the opening of the bottom plate 7 a and the flange 4 a of the sleeve 4, thereby sealing the insulating oil 8 filled in the elephant case 7.

[0005] The upper end of the conductor lead rod 2 projecting into the insulating oil 8 in the elephant case 7 from the upper end of the sleeve 4 of the transformer-in-oil 1 is connected to the moving transformer 21 via the fixed terminal 9. The lead wire 12 on the primary side is connected and fixed. Then, the terminal 16 of the moving cable 22 is inserted into the connection port 4b which opens in the air at the lower end of the sleeve 4, and the connector 16a at the tip of the terminal 16 is connected to the fitting connection hole 3a of the conductor connector 3. Is connected to the transformer adapter 1 in oil. Then, the connector 16 a of the terminal 16 of the moving cable 22 is connected to the lead 12 on the primary side of the moving transformer 21 via the conductor connector 3, the conductor lead-out rod 2 and the fixed terminal 9 of the transformer-in-oil 1. Will be connected. However, a blind plug (not shown) is attached to the connection port 4b of the sleeve 4 of the in-oil transformer adapter 1 in order to prevent a creeping flashover when applying power to the transformer alone. In addition, when the cable is not connected, the blind plug is always connected, so when connecting the moving cable 22, it is necessary to first remove the blind plug from the connection port 4b.

Around the fixed terminal 9 in the insulating oil 8, a shield ring 14 is arranged so as to open and surround the space. The shield ring 14 is a conductor made of a copper plate in a cylindrical shape, and serves to reduce an electric field around the fixed terminal 9. Conventionally, the lower end of the shield ring 14 is attached and fixed to the upper end of the sleeve 4 by screws.

[0007]

However, since the moving transformer 21 is used by being transferred to a substation or the like where a failure occurs at any time, it often receives vibrations from a road surface or the like when moving. . When a bending force is applied to the upper end of the shield ring 14 due to such vibration as shown by a dashed line in FIG. 6, the lower end fixed to the sleeve 4 is damaged without being able to withstand this stress. May be. For this reason, the conventional transformer-in-oil 1 has a problem that the shield ring 14 may be detached due to vibration.

The conventional transformer adapter 1 in oil is
An improved in-gas adapter used in the above-mentioned gas end 26 or the like is used. Here, the gas adapter is
It is used under the condition of SF6 gas insulation, and this SF6 gas is very stable as an insulating medium and hardly deteriorates over time. However, insulating oil has a relatively large aging deterioration, and its reliability decreases with long-term use. For this reason, when the design concept of the conventional gas-in-gas adapter is applied to the oil-in-oil adapter as it is, considering the low reliability of the insulating oil, the creepage distance of the sleeve 4 is short, and the deterioration of the insulating oil over time is likely There is also a problem that the possibility of causing dielectric breakdown increases.

The present invention has been made in view of the above circumstances, and has a structure in which a central portion of the inner periphery of a cylindrical shield ring is fixed to a fixed terminal via a ring-shaped support.
It is an object of the present invention to provide a transformer adapter in oil that does not cause the shield ring to come off even when subjected to vibration.

[0010]

According to the present invention, in order to solve the above-mentioned problems, an insulating sleeve is attached to a connection opening of a case of a moving transformer to seal insulating oil inside. The end of the conductor penetrating through the shaft center of the sleeve protruding into the oil is fixedly connected to the lead wire of the moving transformer via a fixed terminal, and the end of the conductor on the air side is fixed. In the transformer adapter in oil, the part of which can be detachably connected to the terminal of the moving cable, a shield ring made of a tubular conductor is arranged around the fixed terminal in oil, and the inner circumference center of this shield ring The outer edge of the support is fixed to the portion, and the inner edge of the support is fixed to the fixed terminal.

According to the means, since the shield ring is supported in a well-balanced manner with the cylindrical central portion as a fulcrum, even if vibration is applied during the movement of the moving transformer, a particularly large bending stress is applied to the fixed portion. No more joining. Also,
Since the shield ring is securely fixed to the fixed terminal at the center portion of the inner circumference via the support metal, the fixed portion does not become unstable and easily breaks.

Further, the outer peripheral surface of the sleeve in oil is formed in a fold shape.

According to the means, since the creepage distance of the sleeve in the oil is increased by the fold-shaped outer peripheral surface, even if the insulating oil is deteriorated with time, the dielectric breakdown is not easily caused.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a transformer adapter in oil attached to a moving transformer, and FIG. 2 is a shield ring and a support bracket. FIG. 3 is a side view of a transformer adapter in oil in which the outer peripheral surface of the sleeve is tapered, and FIG. 4 is a side view of a transformer adapter in oil in which the outer peripheral surface of the sleeve is pleated. Components having the same functions as those of the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals.

FIG. 1 shows a configuration of the transformer-in-oil adapter 1 of the moving transformer 21 according to the present embodiment. The transformer adapter 1 in oil comprises a conductor pull-out rod 2, a conductor connector 3, and a sleeve 4 having the same configuration as the conventional example shown in FIG. And
The flange 4a on the outer periphery of the sleeve 4 is sandwiched between the holding plate 5 and the mounting bracket 6, and the bottom plate 7a of the elephant case 7 is formed.
, The opening of the bottom plate 7a is sealed and the insulating oil 8 is sealed. However, the outer circumferential surface of the sleeve 4 in the insulating oil 8 is formed such that the tapered creepage distance L is longer than in the case of the conventional example shown in FIG.

A fixed terminal 9 is connected and fixed to the upper end of the conductor lead rod 2 protruding into the insulating oil 8 from the upper end of the sleeve 4 of the transformer-in-oil 1. That is, the upper end of the conductor pull-out bar 2 is fitted into the lower part of the fixed terminal 9, tightened with four bolts 10, and connected and fixed by screwing the through bolt 11. Further, a lead wire 12 on the primary side of the transformer main body is fitted and crimped to the upper end of the fixed terminal 9 to be connected and fixed. Therefore,
The conductor lead rod 2 of the transformer-in-oil adapter 1 is securely connected to the lead wire 12 on the primary side of the transformer main body via the fixed terminal 9.

A shield ring 14 is fixed to the fixed terminal 9 via a support 13. The shield ring 14 is formed by bending both ends of a cylindrical copper plate inward as shown in a half sectional perspective view in FIG. The support bracket 13 is formed by forming a copper plate in a ring shape and forming a cylindrical portion 13b having a short axial length on the outer periphery of the ring-shaped support portion 13a. The cylindrical portion 13 of the support fitting 13 is provided at the center of the inner circumference of the shield ring 14.
The outer peripheral surface of b is fixed by welding. As shown in FIG. 1, the fixed terminal 9 has a flange portion 9 a formed at the center thereof, and the flange portion 9 a and the support portion 13 of the support fitting 13 are formed.
The inner peripheral edge portion a is overlapped and fixed with bolts 15. Therefore, the shield ring 14 is fixed to the fixed terminal 9 with the inner peripheral center supported by the support fitting 13.

After removing a blind plug (not shown) from the connection port 4b of the sleeve 4, the terminal 16 of the moving cable 22 is inserted into the transformer adapter 1 in oil, and the connector 16a at the end of the terminal 16 is connected to a conductor. The moving cable 22 is connected to the submerged transformer adapter 1 by fitting the fitting into the fitting connection hole 3 a of the connector 3. Then, the connector 16 a of the terminal 16 of the moving cable 22 is connected to the lead 12 on the primary side of the moving transformer 21 via the conductor connector 3, the conductor lead-out rod 2 and the fixed terminal 9 of the transformer-in-oil 1. Will be connected. At this time, the terminal 16 of the transfer cable 22 is connected to the transformer adapter 1 in oil by the bolt 17.
Fixed securely.

In the oil-in-oil transformer adapter 1 having the above-described structure, the shield ring 14 is supported by the fixed terminal 9 via the support fitting 13 at the center of the inner periphery in a well-balanced manner. Even if vibrations are applied, no excessive bending stress is applied, and the shield ring 14 is securely fixed to the fixed terminal 9 via the support metal 13, so that the fixed part is damaged and the shield There is no fear that the ring 14 comes off.

The transformer adapter 1 in oil has a creeping distance L of the sleeve 4 which is larger than that of the conventional transformer adapter shown in FIG.
Is formed long, so that even if the insulating oil 8 deteriorates with time, the dielectric breakdown does not easily occur.

In the above embodiment, as shown in FIG. 3, the outer peripheral surface 4c on the upper side of the sleeve 4 (the side disposed in the insulating oil 8) is tapered, and the creepage distance L is linear. As described in FIG. 4, the outer circumferential surface 4c on the upper side of the sleeve 4 is formed as a fold and the creepage distance L is lengthened in a curved shape, as shown in FIG. It may be prevented.

In the above embodiment, the ring-shaped support member 13 made of a copper plate is used.
Any shape or material may be used as long as it is interposed and fixed between the inner peripheral center portion of 4 and the fixed terminal 9.
Moreover, the shield ring 14 is not limited to the cylindrical shape as in the above embodiment, but may be a polygonal cylindrical shape or a spindle-shaped cylindrical shape as long as it is a cylindrical shape surrounding the periphery of the fixed terminal 9.

Further, in the above embodiment, the shield ring 14, the conductor lead-out bar 2, the conductor connector 3, etc. are made of a copper plate or a copper conductive material, but these may be made of any material as long as it is a conductor. Good.

Further, in the above embodiment, the sleeve 4 made of epoxy resin is used, but other insulators such as porcelain can be used.

[0026]

As is clear from the above description, according to the transformer adapter in oil of the present invention, the central portion of the inner periphery of the cylindrical shield ring is fixed to the fixed terminal via the ring-shaped support. Also, even when the moving transformer receives vibration from a road surface or the like during movement, there is no possibility that the fixed portion of the shield ring will be damaged and come off. Further, by increasing the creepage distance of the sleeve in the oil, even if the insulating oil deteriorates over time, it is possible to make it difficult for the dielectric breakdown to occur.

[Brief description of the drawings]

FIG. 1, showing one embodiment of the present invention, is a longitudinal sectional view of a transformer-in-oil adapter attached to a moving transformer.

FIG. 2 illustrates one embodiment of the present invention, and is a perspective view of a shield ring and a support fitting.

FIG. 3, showing an embodiment of the present invention, is a side view of a transformer adapter in oil in which an outer peripheral surface of a sleeve is tapered.

FIG. 4 illustrates one embodiment of the present invention, and is a side view of a transformer adapter in oil in which an outer peripheral surface of a sleeve is folded.

FIG. 5 is a block diagram illustrating an example of use of a moving transformer.

FIG. 6 shows a conventional example, and is a longitudinal sectional view of a transformer adapter in oil attached to a moving transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-oil transformer adapter 2 Conductor lead-out rod 3 Conductor connector 3a Fitting connection hole 4 Sleeve 7 Elephant case 8 Insulating oil 9 Fixed terminal 12 Lead wire 13 Supporting fitting 14 Shield ring 16 Terminal 21 Moving transformer 22 Moving cable

Claims (2)

[Claims] An insulating sleeve is attached to a connection opening of a case of a moving transformer to seal an insulating oil therein, and a conductor penetrating through an axial part of the sleeve is provided on an oil-inside side of a conductor. The protruding end is connected and fixed to the lead wire of the moving transformer via a fixed terminal, and the air-side end of this conductor is detachably connected to the terminal of the moving cable. In the transformer adapter, a shield ring made of a tubular conductor is arranged around the fixed terminal in oil, and at the center of the inner circumference of this shield ring,
A transformer adapter in oil, characterized in that an outer edge of a support fitting is fixed and an inner edge of the support fitting is fixed to a fixed terminal. 2. The transformer adapter in oil according to claim 1, wherein an outer peripheral surface of the sleeve in oil is formed in a fold shape.