JP2011159647A - Transformer device having tap changer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer device having a built-in tap changer capable of ensuring sealability even in special conditions in a cold district. <P>SOLUTION: The transformer device includes a tap changer including a transformer tank 1 for housing the transformer in the inside, a tap changer 2 having a changing mechanism unit 6 fixed in the transformer tank and selecting a predetermined tap voltage, and an operation handle 4 for rotating and operating the tap changer by operating it from the outside of the transformer tank. The transformer further includes a tap changer comprising an operation coupling mechanism 5 formed between the operation handle and the tap changer, transmitting the rotation operation of the operation handle to the tap changing unit to rotate and operate the changing mechanism unit of the tap changer, a through-hole 1b formed on the transformer tank to allow the operation coupling mechanism to penetrate therethrough, and at least two or more cold-proof O-rings 3 formed in the through-hole to seal the inside and outside of the transformer tank. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transformer provided with a tap changer that can satisfy a predetermined sealing performance even in a special environment at an extremely low temperature.

  As shown in Patent Document 1, there is means for providing an operation handle outside and switching the tap of the transformer.

  On the other hand, there is a tap changer as shown in FIG. 2, and an operation handle is also provided outside, and the tap of the transformer can be switched.

  FIG. 2 shows a longitudinal sectional view of an overall view of a transformer including a conventional tap changer. As shown in FIG. 3, the tap changer 2 is connected to a plurality of lead wires 21a from a transformer main body 21 (the transformer main body is shown in a simplified diagram in FIG. 2). The transformer tank 1 houses a transformer main body 21 and a tap changer 2 inside.

FIG. 3 is a longitudinal sectional view showing the vicinity of the tap changer 2 in FIG. 2 in detail. (A) shows a longitudinal sectional view, and (B) shows a sectional view taken along the line III-III of (A).
Reference numeral 17 denotes an operation handle provided outside the transformer tank 1 and connected to the tap changer 2. By rotating the operation handle 17, the tap changer 2 can be selected to a predetermined tap voltage.

  The tap changer 2 includes a switching mechanism 6 and a frame 12.

The switching mechanism unit 6 will be described. The switching mechanism unit 6 includes a main shaft 8 and a contact 10.
The main shaft 8 includes an upper main shaft 81 and a lower main shaft 82. The upper main shaft 81 has a cylindrical shape, and the lower main shaft 82 has a substantially cylindrical shape. The main shaft 8 has a diameter larger than that of the upper main shaft 81, and is a transformer tank. With respect to one plane, the vertical direction is the axial direction. The upper part of the upper main shaft 81 is connected to the operation handle 17 and the screw 18. With this configuration, when the operation handle 4 rotates, the upper main shaft 81 and the lower main shaft 82 of the main shaft 8 also rotate.
Further, the three contacts 10 are attached to the lower main shaft 82 in the axial direction. The contact 10 is a copper plate having a predetermined width along the radial direction and having the shape shown in FIG. 3B. If the lower main shaft 82 rotates, the contact 10 also rotates.

A frame 12 is arranged so as to surround the switching mechanism unit 6.
The frame 12 includes a skeleton 16, a tap terminal 11, a pressing member 13, a fixing portion 14, and a packing 15.
The skeleton 16 is assembled into a cylindrical shape by combining a plurality of substantially rod-shaped bars, and covers the switching mechanism 6. A plurality of tap terminals 11 connected to a plurality of lead wires drawn out from the transformer winding are fixed to the outer periphery of the three positions in the axial direction of the framework 16, and the three tap terminals 11 in the axial direction are fixed. The position is disposed at a position facing the contact 10 and is disposed at a position where the contact 10 can be contacted. By adopting such a configuration, when the lower main shaft 82 rotates, the contactor 10 also rotates and contacts between two of the predetermined tap terminals 11, thereby The tap voltage can be selected.

  A fixing portion 14 is fixed to the upper end of the framework 16. The fixed portion 14 includes a main shaft cylinder 14a and a receiving portion 14b that are integrally formed. The main cylinder 14a has a cylindrical shape and is provided with a cylindrical hollow portion therein. The upper main shaft 81 is disposed in the hollow portion so as to cover the upper main shaft 81. At this time, the upper main shaft 81 is rotatable, and the main shaft cylinder 14a is not rotated at that time. Further, the outer periphery of the spindle cylinder 14a is threaded, and has a structure in which a pressing member 13 described later is fitted.

  The receiving portion 14b is disposed at the lower portion of the main shaft cylinder 14a, is also cylindrical, has a cylindrical hollow portion therein, and the upper main shaft 81 is disposed through the hollow portion so as to cover the upper main shaft 81. It has a simple structure. Similarly, the upper main shaft 81 is rotatable, and the receiving portion 14b does not rotate at that time. The receiving portion 14b has a larger diameter than the main cylinder 14a. The frame 12 is fixed to the transformer tank 1 by sandwiching the transformer tank 1 between the holding member 13 and the receiving portion 14b, which will be described later, and tightening the holding member 13. is doing.

  The pressing member 13 has a cylindrical shape, and is provided with a hollow portion and threaded so that the pressing member 13 can be fitted into the main cylinder 14a. As described above, the frame 12 is fixed to the transformer tank 1 by tightening the pressing member 13 in the direction of the receiving portion 14b. Further, for the purpose of providing a function as a buffer material at that time and a function of sealing the inside and outside of the transformer tank 1, a plate-like packing 15 having a cylindrical shape and having a through portion therein is provided with a transformer tank. 1 and the receiving portion 14b.

  With such a configuration, even if the switching mechanism unit 6 rotates, the frame 12 is not rotated because the frame 12 is fixed to the transformer tank 1, and the contact 10 of the switching mechanism unit 6 rotates. A predetermined tap voltage can be selected by contacting with the predetermined tap terminal 11 by the dynamic operation and dissociating from the predetermined tap terminal 11.

  However, since the normal packing 15 shown in FIG. 3 does not satisfy the cold resistance, the predetermined compressive force of the packing is not satisfied due to the low temperature in a very cold region, and the function cannot be sufficiently performed. Arise. If the packing 15 cannot sufficiently satisfy the predetermined function, the oil inside the transformer tank may leak from the location to the outside, causing oil leakage.

Japanese Patent Laid-Open No. 2005-311017

  As a countermeasure, it is conceivable that the packing 15 is made of a special material that can be used even in a cold region, but it is difficult to procure a special packing that can be used in a cold region with the shape of the packing 15 shown in FIG. Even if procurement is possible, there is a problem that stable supply is difficult and cost increases.

  An object of the present invention is to solve the above-described problems, and provides a transformer with a built-in tap changer that can ensure hermeticity even under special conditions in cold regions.

  In order to solve the above-described problem, the invention of claim 1 is configured such that a transformer tank that houses a transformer and a tap terminal connected to a plurality of lead wires drawn from the transformer winding are fixed. A frame fixed in the transformer tank, and a switching mechanism that is arranged in the frame, contacts or dissociates with the tap terminal by rotating operation, and selects a predetermined tap voltage by contacting the predetermined tap terminal; And a transformer having a tap changer with an operation handle for rotating the switching mechanism of the tap changer by operating from the outside of the transformer tank. An operation connecting mechanism provided between the tap changers, for transmitting the turning operation of the operation handle to the tap changer and turning the changeover mechanism of the tap changer; A through-hole provided for penetrating the operation coupling mechanism in the tank, and at least two cold-resistant O-rings provided in the through-hole to seal the inside and the outside of the transformer tank. It is a thing.

  The invention according to claim 2 is such that an auxiliary support fitting for fixing the tap changer is fixed in the transformer tank, and the frame of the tap changer is connected and fixed to the auxiliary support fitting.

  According to a third aspect of the present invention, the motion coupling mechanism is cylindrical, and is connected to the operation handle and the switching mechanism, and the motion coupling mechanism also rotates when the operation handle rotates. is there.

  According to a fourth aspect of the present invention, a bearing provided with a through hole for penetrating the operation coupling mechanism is attached to the transformer tank, and the through hole of the bearing and the through hole of the transformer tank are arranged coaxially. In this state, the operation connecting mechanism is penetrated.

  According to the present invention, it is possible to seal using a cold-resistant O-ring that can be stably supplied. Therefore, it is not necessary to use a special-purpose tap changer provided with an O-ring groove in the conventional tap changer, and it can be handled by a conventional existing tap changer, so there was a sudden need for a cold region. Can be handled easily and quickly.

FIG. 1 shows a transformer having a tap changer according to the present invention, in which (A) shows a longitudinal sectional view, and (B) shows a sectional view taken along line II-II in (A). is there. The longitudinal cross-sectional view of the whole figure of the transformer provided with the conventional tap changer is shown. It is the longitudinal cross-sectional view which showed the tap switch vicinity of FIG. 2 in detail, Comprising: (A) shows a longitudinal cross-sectional view, (B) shows the III-III sectional view taken on the arrow of (A). is there.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a transformer having a tap changer according to the present invention, in which (A) shows a longitudinal sectional view, and (B) shows a sectional view taken along line II-II in (A). is there.

  Reference numeral 1 is a transformer tank, and 2 is a tap changer provided inside the transformer tank 1. Reference numeral 4 denotes an operation handle provided outside the transformer tank. An operation coupling mechanism 5 is provided between the operation handle 4 and the tap changer 2. Further, an auxiliary support fitting 7 for supporting the tap changer 2 in the transformer tank is fixed inside the transformer tank 1.

The transformer tank 1 is provided with a through hole 1a1 for penetrating the operation connecting mechanism 5, and two O-rings 3 are provided in the through-hole 1a1, and the O-ring 3 communicates the inside and outside of the transformer tank 1. It plays a role of sealing.
The above is the structure of the transformer mainly including the tap changer.

First, the transformer tank 1 will be described.
A bearing 1a made of the same metal material as the cylindrical transformer tank 1 is attached to the transformer tank 1 by welding as shown in FIG. As described above, the cylindrical through hole 1a1 for penetrating the motion coupling mechanism 5 is provided in the bearing 1a. The through-hole 1a1 is provided for the purpose of positioning so that the shaft of the motion coupling mechanism 5 does not shake, and for stabilizing the shaft without shaking even if it rotates. The transformer tank 1 is also provided with a circular through hole 1b for allowing the operation coupling mechanism 5 to pass therethrough. The through holes 1a1 and 1b are almost the same diameter and are arranged coaxially. The mechanism 5 is penetrated.
Further, a transformer main body 21 shown in FIG.

Next, the operation handle 4 and the motion connecting mechanism 5 will be described.
The operation handle 4 has a flat lever shape, and is fixed to the upper part of the operation connecting mechanism 5 by a bolt 5a. The operation connecting mechanism 5 is constituted by a cylindrical metal fitting and passes through the through holes 1a1 and 1b so as to be coaxial with the through hole 1a1 of the bearing 1a and the through hole 1b of the transformer tank 1 as shown above. is doing. The upper end of the motion coupling mechanism 5 is connected to the operation handle 4 by the bolt 5 a described above, and the lower end is connected to the tap changer 2. When the operation handle 4 is manually rotated, the operation connecting mechanism 5 is similarly rotated around the axis.

Next, the tap changer 2 will be described.
The tap changer 2 includes a frame 12 and a switching mechanism unit 6.
The frame 12 is fixed to an auxiliary support fitting 7 that is fixed inside the transformer tank 1. The switching mechanism unit 6 is disposed in the frame 12, and a predetermined tap can be selected by a rotating operation.

  First, the switching mechanism unit 6 will be described. The switching mechanism unit 6 includes a main shaft 8 and a contact 10.

  The main shaft 8 includes an upper main shaft 81 and a lower main shaft 82. The upper main shaft 81 has a cylindrical shape, and the lower main shaft 82 has a substantially cylindrical shape. The main shaft 8 has a diameter larger than that of the upper main shaft 81, and is a transformer tank. With respect to one plane, the vertical direction is the axial direction. The upper part of the upper main shaft 81 has a prismatic structure, and the lower end of the motion coupling mechanism 5 has a prismatic cut of the same shape, and the main shaft 8 and the motion coupling mechanism 5 are connected by fitting each other. Yes. With this configuration, when the operation handle 4 rotates, the operation coupling mechanism 5 also rotates, and at the same time, the upper main shaft 81 and the lower main shaft 82 of the main shaft 8 also rotate.

  Further, the three contacts 10 are attached to the lower main shaft 82 in the axial direction. The contact 10 is a copper plate having a predetermined width along the radial direction and having the shape of FIG. O. If the lower main shaft 82 rotates, the contact 10 also rotates.

  A frame 12 is arranged so as to surround the switching mechanism unit 6.

The frame 12 includes a skeleton 16, a tap terminal 11, a pressing member 13, a fixing portion 14, and a packing 15.
The skeleton 16 is assembled into a cylindrical shape by combining a plurality of substantially rod-shaped bars, and covers the switching mechanism 6. A plurality of tap terminals 11 connected to a plurality of lead wires drawn out from the transformer winding are fixed to the outer periphery of the three positions in the axial direction of the framework 16, and the three tap terminals 11 in the axial direction are fixed. The position is disposed at a position facing the contact 10 and is disposed at a position where the contact 10 can be contacted. By adopting such a configuration, when the lower main shaft 82 rotates, the contactor 10 also rotates and contacts between two of the predetermined tap terminals 11, thereby The tap voltage can be selected.

  A fixing portion 14 is fixed to the upper end of the framework 16. The fixed portion 14 includes a main shaft cylinder 14a and a receiving portion 14b that are integrally formed. The main cylinder 14a has a cylindrical shape and is provided with a cylindrical hollow portion therein. The upper main shaft 81 is disposed in the hollow portion so as to cover the upper main shaft 81. At this time, the upper main shaft 81 is rotatable, and the main shaft cylinder 14a is not rotated at that time. Further, the outer periphery of the spindle cylinder 14a is threaded, and has a structure in which a pressing member 13 described later is fitted.

  The receiving portion 14b is disposed at the lower portion of the main shaft cylinder 14a, is also cylindrical, has a cylindrical hollow portion therein, and the upper main shaft 81 is disposed through the hollow portion so as to cover the upper main shaft 81. It has a simple structure. Similarly, the upper main shaft 81 is rotatable, and the receiving portion 14b does not rotate at that time. The receiving portion 14b has a diameter larger than that of the main shaft cylinder 14a. The frame 12 is fixed to the auxiliary supporting bracket 7 by sandwiching the auxiliary supporting bracket 7 between the pressing member 13 and the receiving portion 14b, which will be described later, and tightening the pressing member 13. is doing.

  The pressing member 13 has a cylindrical shape, and is provided with a hollow portion and threaded so that the pressing member 13 can be fitted into the main cylinder 14a. As described above, the frame 12 is fixed to the auxiliary support fitting 7 by tightening the pressing member 13 in the direction of the receiving portion 14b. Further, a packing 15 is provided between the auxiliary support fitting 7 and the receiving portion 14b as a cushioning material at that time.

  By adopting such a configuration, even if the switching mechanism unit 6 rotates, the frame 12 is fixed in the transformer tank 1 by the auxiliary support fitting 7 and thus does not rotate. When the contactor 10 is brought into contact with the predetermined tap terminal 11 by the rotation operation and is dissociated from the predetermined tap terminal 11, a predetermined tap voltage can be selected.

Next, the O-ring 3 will be described.
The O-ring 3 is made of a material that satisfies a predetermined performance even under special conditions in a cold region. As shown in FIG. The O-ring 3 is provided with a groove around a through hole 1a1 provided in the transformer tank 1, and the O-ring 3 is fitted in the groove. Further, the operation connecting mechanism 5 of the tap changer 2 is also provided with a groove, and the O-ring 3 is fitted in the groove. With such a configuration, the O-ring 3 prevents the insulating oil (not shown) inside the transformer tank 1 from leaking to the outside. The two O-rings 3 are provided to stabilize the rotating operation during the rotating operation of the motion connecting mechanism 5 and to prevent the shaft center from shifting during the rotating operation. .

Here, the reason why the motion coupling mechanism 5 is provided will be described.
As shown in the prior art, with the conventional configuration, the packing 15 may not satisfy the predetermined packing performance in a cold region and may cause oil leakage. Therefore, it is possible to cope with this by changing the packing 15 to a cold-resistant packing material, but these become special specifications, and stable supply is difficult. Therefore, an O-ring can be supplied stably even for cold resistance. The use of the cold-resistant O-ring 3 in place of the packing 15 shown in FIG. 3 requires that an O-ring groove be provided in the receiving portion 14b of the tap changer 2, and a special tap changer 2 having an O-ring groove is provided. This is also a special specification and it is difficult to provide a stable supply. From the above, it is necessary to cope with existing members.

  As described above, a device for maintaining the sealing performance using the O-ring 3 with existing members is required. The present invention is characterized in that the operation connecting mechanism 5 for transmitting the rotational movement of the operation handle 4 is provided, and the operation connecting mechanism 5 is provided with the O-ring 3 so that the sealing performance is maintained.

  By adopting the configuration as described above, it is possible to cope with existing members, and it becomes unnecessary to prepare a new tap changer. Furthermore, even if there is a sudden need for a cold region, conventional products can be easily and quickly dealt with.

  In the present invention, there are two O-rings, but three or more may be used.

DESCRIPTION OF SYMBOLS 1 Transformer tank 1a Bearing 1a1 Bearing through-hole 1b Transformer tank through-hole 2 Tap changer 3 O-ring 4 Operation handle 5 Operation coupling mechanism 6 Switching mechanism 7 Auxiliary support fitting 11 Tap terminal 12 Frame 21a Lead wire

Claims (4)

A transformer tank that houses the transformer,
A tap terminal connected to a plurality of lead wires drawn out from the transformer winding is fixed, a frame fixed in the transformer tank, and arranged in the frame, and is in contact with the tap terminal by a rotating operation or A tap changer comprising a switching mechanism that dissociates and selects a predetermined tap voltage by contacting a predetermined tap terminal;
In the transformer provided with the tap changer provided with an operation handle for rotating the switching mechanism of the tap changer by operating from the outside of the transformer tank,
An operation coupling mechanism that is provided between the operation handle and the tap changer, transmits the rotation operation of the operation handle to the tap switching unit, and rotates the switching mechanism unit of the tap changer;
A through-hole provided for penetrating the operation coupling mechanism in the transformer tank;
A transformer comprising a tap changer comprising at least two cold-resistant O-rings provided in the through hole to seal the inside and outside of the transformer tank.   The transformer provided with the tap changer according to claim 1, wherein an auxiliary support fitting for fixing the tap changer is fixed in the transformer tank, and a frame of the tap changer is connected and fixed to the auxiliary support fitting.   The operation connecting mechanism is cylindrical and is connected to the operation handle and the switching mechanism, and the operation connecting mechanism also rotates when the operation handle rotates. A transformer comprising the tap changer according to 1.   A bearing provided with a through-hole for allowing the operation coupling mechanism to pass through is attached to the transformer tank, and the operation coupling mechanism is in a state where the through-hole of the bearing and the through-hole of the transformer tank are arranged coaxially. The transformer provided with the tap changer according to claim 1 to 3, wherein

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