JP2008016489A - Oil-immersed transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-immersed transformer which is constituted more easily and inexpensively. <P>SOLUTION: An oil-immersed transformer comprises: a tank 1 in which the winding and the core are contained while being immersed in insulation oil A; and a plurality of connection tubes 2 connected with the tank 1. A connection tube 2a in the connection tubes 2 having a space B for storing the insulation oil A to be spouted in case of internal failure of the tank 1 is connected with an oil spout tube 15 forming an oil spout channel of the insulation oil A for the tank 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil-filled transformer that discharges insulating oil to the outside and prevents destruction of the tank when an accident involving arc discharge occurs inside the tank.

  For example, as shown in FIG. 5, a conventional oil-filled transformer of this type includes a tank 30 in which a winding and an iron core are immersed in insulating oil and a plurality of connecting pipes 31 connected to the tank 30. ,..., And an oil discharge tank 46 connected to the tank 30 via a fountain tube 45.

  As shown in FIGS. 5 and 6, the connection tube body 31 a connected to the primary side of the connection tube body 31 is made of a bus duct and is a flexible tube introduced in a substantially upright state from the bottom. A road member 32, a power cable 33 inserted through the pipe member 32, an insulator 34 attached horizontally to the upper part of the side wall of the connecting pipe 2a, and an electric power provided at the tip of the insulator 34 A bracket 35 of the cable 4 and a bus bar 36 connected to the distal end portion of the power cable 35 are provided. The bus bar 36 is connected to the primary winding via the insulator 34. Further, a ventilation port 37 is formed on each of the front, rear, left, and right side surfaces of the lower portion of the connecting tube 31a, and a ventilation plate 38 having a plurality of ventilation holes 39,. ing. In some cases, the oil discharge tank 46 is buried in the ground.

  As described above, in the oil discharge tank 46, the insulating oil A discharged from the tank 30 is stored through the fountain tube 45 in the event of an accident.

  However, in the case of the oil-filled transformer, an installation space for the oil discharge tank 46 is required, and in addition to an increase in the overall installation space, the manufacture of the oil discharge tank 46 and its foundation are required. Therefore, there is a problem that the cost increases accordingly.

  Further, as another conventional example, for example, a tank in which an iron core and a winding are immersed in insulating oil, an oil storage space disposed inside the tank, and a pressure increase due to an accident inside the tank are insulated from the oil. It is known that a pressure relief device that relaxes by releasing the oil and an oil guide pipe that guides the released insulating oil to the oil storage space (see Patent Document 1).

In this case, by providing an oil storage space in the tank, an installation space for the oil discharge tank is eliminated, and an inexpensive oil-filled transformer is provided.
JP 2000-21645 A

  However, since the oil-filled transformer disclosed in the above publication needs to form an oil storage space in the tank, there is a problem in that the structure of the tank is complicated and much time is required for assembly, which increases the cost.

  Then, an object of this invention is to provide the oil-filled transformer which can be comprised more simply and cheaply in view of the said problem.

In order to solve the above problems, an oil-filled transformer according to the present invention includes a tank 1 in which a winding and an iron core are immersed in insulating oil A and a plurality of connecting pipes 2 connected to the tank 1. In the oil-filled transformer including the tank 1, the tank 1 is connected to the connecting pipe 2 a having the oil storage space B of the insulating oil A ejected in the event of an accident inside the tank 1. Is connected to a fountain tube 15 for forming a fountain passage for insulating oil A.

  Therefore, since the existing connecting pipe 2a is also used as an oil storage tank for the insulating oil A, there is no need to separately provide an oil storage tank or space, and the configuration becomes extremely simple and inexpensive.

  Further, as the connecting pipe body 2a having the oil storage space B of the insulating oil A, the pipe material 3 introduced therein, the power cable 4 inserted through the pipe material 3, the power cable 4 and the winding It is preferable to use a bus duct having a bus bar 7 connected between them.

  In this case, since the insulating oil A does not directly contact the power cable 4 and the bus bar 7, it is not necessary to replace or clean the power cable 4 and the bus bar 7.

  Furthermore, at least one of the joint portion of the inner wall forming the oil storage space B of the connecting pipe body 2 a, the introduction portion of the pipe material 3, and the gap between the opening end of the pipe material 3 and the power cable 4 is sealed by the sealing material 10. It is good.

  In this case, the insulating oil A leaks from the connecting tube 2a by sealing the joint portion of the inner wall forming the oil storage space B of the connecting tube 2a or the introduction portion of the pipe material 3 with the sealing material 10. There is no. Further, when the gap between the pipe line material 3 and the power cable 4 is sealed by the sealing material 10, the insulation oil A is not stored in the gap, so that the insulation oil A is stored in the connecting pipe 2a. Insulating oil A can be easily discharged to the outside.

  Then, the end portion of the oil jet tube body 15 may be introduced and bent downward inside the connection tube body 2, and the jet port 16 may be opposed to the side wall of the connection tube body 2a.

  Then, since the insulating oil A is sprayed toward the side wall of the connecting pipe 2a, it can be easily guided to the oil storage space below the connecting pipe 2a along the side wall, while the power cable 4 and the bus bar 7 Such a member is not wetted with the insulating oil A.

  In addition, a guide plate 17 for guiding the flow of the insulating oil A ejected from the oil jet tube 15 to the oil storage space B may be provided inside the connection tube 2a.

  Therefore, it is possible to store the insulating oil A ejected from the fountain tube body 15 without leaving the oil storage space B with a simple configuration.

  As described above, according to the present invention, since the existing connecting pipe is also used as the oil storage tank, there is an effect that it can be configured very simply and at low cost.

  In addition, as the means for spraying the insulating oil inside the connecting pipe, the oil is sprayed toward the side wall of the connecting pipe or the flow of insulating oil is guided to the oil storage space by the guide plate. In this case, the insulating oil ejected from the tank can be stored in the connecting pipe without any trouble. On the other hand, the insulating oil is sealed by sealing at least one of the joint portion of the inner wall of the connecting pipe forming the oil storage space, the introduction portion of the pipe material, and the gap between the opening end of the pipe material and the power cable with a sealing material. Can be prevented, and the insulating oil can be smoothly discharged to the outside.

  Hereinafter, an oil-filled transformer according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the oil-filled transformer of the present embodiment includes a tank 1 in which a winding and an iron core are immersed in insulating oil A and a plurality of connection pipes connected to the tank 1. Of the connecting pipes 2, ..., the connecting pipe 2a having the oil storage space B of the insulating oil A, and the oil jet pipe 15 connected between the connecting pipe 2a and the tank 1; It is composed of

  The connecting pipe body 2a is made of a bus duct, has an oil storage space B for the insulating oil A on its lower side, and has a flexible pipe material 3 introduced in a substantially upright state from the bottom, A power cable 4 inserted through the conduit 3, a lever 5 attached horizontally to the upper part of the side wall of the connecting pipe 2 a, and a bracket 6 of the power cable 4 provided at the tip of the lever 5 And a bus bar 7 connected to the tip of the power cable 4 is provided. The bus bar 7 is connected to the primary winding via the insulator 5. In addition, as the pipe material 3, it is preferable to use Fflex (trade name) manufactured by Furukawa Electric, for example.

  An oil drain valve 8 is provided at the lower portion of the side wall of the connecting tube 2a, and a ventilation duct 9 is provided at the upper portion of the side wall so as to communicate with the inside of the connecting tube 2a. The joint portion between the bottom wall and the side wall of the connecting tube 2 a is sealed with a seal material 10.

  The power cable 4 is inserted into the pipe material 3, and the gap between the upper end opening of the pipe material 3 and the power cable 4 and the periphery of the introduction portion of the pipe material 3 are sealed with a seal material 10. .

  The fountain tube 15 has one end connected to the tank 1 and the other end introduced into the connection tube 2a. The fountain tube 15 is located below the connection tube 2a. And the outlet 16 at the other end faces the side wall of the connecting tube 2a. The reason for this is that the insulating oil A is ejected toward the side wall of the connecting pipe 2a, so that the insulating oil A is prevented from coming into direct contact with the power cable 4 and the bus bar 7, and the replacement and cleaning of these members is avoided. This is to eliminate the need for labor.

  When an accident occurs inside the tank 1, the insulating oil A inside the tank 1 is discharged into the connection pipe body 2 a through the fountain pipe body 15. At this time, as shown in FIG. 2, the insulating oil A is sprayed toward the side wall of the connecting tube 2a by the fountain tube 15 and stored in the oil storage space B below the connecting tube 2a.

  Further, the stored insulating oil A contacts the pipe line material 3 but does not directly contact the power cable 4. Even if the insulating oil A whose temperature has risen may come into direct contact with the power cable 4, there is no problem because the outer covering member of the power cable 4 has heat resistance.

  On the other hand, the inside of the connecting pipe 2a is ventilated through the ventilation duct 9, and the insulating oil A inside the connecting pipe 2a is configured to be discharged to the outside by the oil discharge valve 8. There is no problem even if the body 2a has both the storage of the electric conductor (the power cable 4 and the bus bar 7) and the storage of the insulating oil A.

  In the case of the above embodiment, the jet port 16 of the fountain tube body 15 is opposed to the side wall of the connecting tube body 2a. However, as shown in FIG. At the same time, a guide plate 17 may be provided horizontally above it to prevent the insulating oil A from scattering, while the insulating oil A may be guided to the oil storage space B. As shown in FIG. The body 15 may be provided through the side wall of the connecting pipe 2a, and the guide plate 17 that guides the flow of the insulating oil A to the oil storage space B may be inclined and attached.

  Further, the insulating oil A is stored in the connecting pipe 2a (bus duct) in which the pipe material 15, the power cable 4, the bus bar 7 and the like are housed, but the present invention is not limited to this. The connecting pipe body 2a having the oil storage space B may be used.

It is a figure which shows the oil-filled transformer which concerns on one Embodiment of this invention. It is a sectional side view of the connection pipe body (bus duct) of FIG. It is the sectional side view which showed the modification of the connection pipe body. It is the sectional side view which showed the other modification of the connection pipe body. It is a figure which shows the oil-filled transformer of a prior art example. It is a sectional side view of the connection pipe body (bus duct) of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tank 2, 2a, 31, 31a ... Connection pipe body, 3 ... Pipe line material, 4 ... Electric power cable, 5 ... Insulator, 6 ... Bracket, 7 ... Bus bar, 8 ... Oil drain valve, 9 ... Ventilation duct, DESCRIPTION OF SYMBOLS 10 ... Sealing material, 15 ... Jet oil pipe body, 16 ... Jet port, 17 ... Guide plate, 30 ... Tank, 32 ... Pipe line material, 33 ... Power cable, 34 ... Insulator, 35 ... Bracket, 36 ... Bus bar, 37 ... Ventilation port, 38 ... Ventilation plate, 39 ... Ventilation hole, 45 ... Fuel oil pipe body, 46 ... Drain tank, A ... Insulating oil, B ... Oil storage space

Claims (5)

Oil-filled transformer comprising a tank (1) in which a winding and an iron core are immersed and stored in insulating oil (A), and a plurality of connecting pipes (2, ...) connected to the tank (1) In
Of the connecting pipes (2, ...), the tank (1) is connected to the connecting pipe (2a) having the oil storage space (B) of the insulating oil (A) ejected in the event of an accident inside the tank (1). An oil-filled transformer comprising: a fountain pipe body (15) for forming a fountain flow path for insulating oil (A) therebetween.   The connecting pipe (2a) includes a pipe line material (3) introduced therein, a power cable (4) inserted through the pipe line material (3), the power cable (4) and a winding. The oil-filled transformer according to claim 1, comprising a bus duct having a bus bar (7) connected between the two.   The joint portion of the inner wall forming the oil storage space (B) of the connecting pipe (2a), the introduction portion of the pipe material (3), the gap between the open end of the pipe material (3) and the power cable (4) The oil-filled transformer according to claim 2, characterized in that at least one is hermetically sealed by a sealing material (10).   Inside the connection pipe body (2a), the end of the oil jet pipe body (15) is introduced and bent downward, and the jet outlet (16) faces the side wall of the connection pipe body (2a). The oil-filled transformer according to any one of claims 1 to 3, wherein the transformer is filled with oil.   Inside the connecting pipe (2a), a guide plate (17) is provided for guiding the flow of insulating oil (A) ejected from the oil jet pipe (15) to the oil storage space (B). The oil-filled transformer according to any one of claims 1 to 4.

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