JPH07192940A - Single-phase transformer and transport method thereof - Google Patents

Abstract

PURPOSE:To simplify insulation and assembly after transfer by disposing and jointing a bushing terminal and high-voltage leads toward first and second transformers approximately linearly and connecting each high-voltage lead terminal at connecting places with winding lead terminals respectively. CONSTITUTION:High-voltage leads 5 bonded with a bushing terminal 7a in a high-voltage bushing duct 9 are wired toward first and second unit transformers 1A, 1B approximately linearly. Each high-voltage lead terminal is connected at connecting places with winding lead terminals 3a mounted between the adjacent windings 3 of the first and second unit transformers 1A, 1B respectively. The high-voltage bushing duct 9 is turned so that the high- voltage leads 5 are made approximately perpendicular, and the high-voltage bushing duct 9 is transferred so as to hold the turned state. Accordingly, insulation and assembly after transfer can be simplified. The high-voltage leads in maximum length are acquired for a transportation limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-phase transformer in which two transformers are connected in parallel via a T-shaped bushing duct and a method of transporting the same, and more particularly to a high voltage lead in the T-shaped bushing duct. The present invention relates to a single-phase transformer that can be connected near the winding outlet of each transformer, thereby simplifying the insulation configuration and on-site assembly work, and a transportation method thereof.

[0002]

2. Description of the Related Art In recent years, as the demand for electric power has increased, in order to improve the efficiency of power transmission with a high transmission voltage, it is currently 1000 kV.
Class UHV transmission is planned. This also allows
The transformer is required to make a dramatic progress in doubling the voltage and capacity as compared with the conventional maximum scale 500 kV class transformer.

In a substation in which this type of transformer is installed, the current condition is 500 due to various reasons.
It is expected that the substation for kV transmission will be worse than that of the substation, and many transportation restrictions will occur. Therefore, the conventional 500
It becomes impossible to realize a three-phase configuration consisting of three single-phase transformers like a kV transformer, and the single-phase transformer has two more
It needs to be composed of a unit transformer.

FIG. 7 is a plan view showing the structure of a single-phase transformer composed of two unit transformers.

This single-phase transformer is composed of first and second unit transformers 1A and 1B arranged to face each other, and each unit transformer 1A and 1B is an iron core 2 housed in a transformer tank 4.
And its winding 3.

The transformer tanks 4 are connected to each other via a high pressure bushing duct (T-shaped bushing duct) 9 and a medium pressure bushing duct. On the other hand, the high voltage lead 5 connected to the winding 3 of each unit transformer 1A, 1B is arranged and joined at right angles to the bushing 7 in the high voltage bushing duct 9, and the medium voltage lead connected to the winding 3 in the same manner. 6 is connected to the bushing 8 in the medium pressure bushing duct. In this way, the unit transformers 1A and 1B are electrically connected in parallel.

In the case of the UHV transformer, the potential of the high voltage lead 5 is about 1000/3 ^1/2 kV and the potential of the medium voltage lead 6 is about 500/3 ^1/2 kV.

Since the voltage of the high-voltage lead 5 becomes about twice as high as that of the conventional maximum voltage of 500 kV lead, the cover is raised from the lead-out position at the center of the winding height like the 500 kV lead. In the method of connecting with the high voltage bushing above, the insulation configuration is complicated and the insulation reliability cannot be achieved. Therefore, as shown in FIG. 7, the long side surface of the transformer tank 4 is penetrated from the center of the winding height. Then, the method of directly connecting to the bushing at the shortest distance is adopted.

[0009]

However, in the above single-phase transformer, the high-voltage bushing duct 9 is disassembled from the transformer tank 4 of each unit transformer 1A, 1B and reassembled on site for transportation reasons. However, there is a problem that the on-site connection work and the insulation work by the high-voltage lead 5 with the high-voltage bushing 7 and the winding 3 are complicated.

Further, in the on-site assembly work, there is a possibility that the insulator inside the high voltage bushing duct 9 and each of the unit transformers 1A and 1B may absorb moisture or foreign matter, and such moisture absorption and foreign matter may occur. Therefore, the reliability of the UHV transformer is significantly reduced.

The present invention has been made in consideration of the above circumstances, and in particular, by making it possible to connect the high voltage lead in the T-shaped bushing duct in the vicinity of the winding outlet of each transformer,
An object of the present invention is to provide a single-phase transformer and a transportation method thereof, which can simplify the insulating structure and the assembly work after the transportation.

Another object of the present invention is to secure moisture resistance and dust resistance in the assembly work after transfer,
It is to improve the quality.

[0013]

The invention according to claim 1 provides a first transformer tank for accommodating a first transformer and a second transformer tank for accommodating a second transformer to each other. In a single-phase transformer in which the long side surfaces are arranged to face each other and the first and second transformers are connected in parallel via a T-shaped bushing duct, the first and second transformers are arranged in parallel between the first and second transformers. A bushing terminal portion forming the T-shaped bushing duct, and a high-voltage lead portion arranged at a right angle and arranged and joined substantially linearly toward the first and second transformers;
Further, each high-voltage lead end is a single-phase transformer connected to a connection point with a winding lead-out portion provided between adjacent windings of the first and second transformers.

The invention according to claim 2 provides a transportation method for transporting a single-phase transformer according to claim 1,
It is a method of transporting a single-phase transformer, which includes a step of allowing transportation in a state where the high-voltage lead portion of the T-shaped bushing duct is erected substantially vertically.

Further, the invention according to claim 3 is the transportation method for transporting a single-phase transformer according to claim 1, wherein the transportation platform having one end of the bottom portion formed into a curved surface is used, and the T-shaped bushing duct is provided. Is accommodated in the transport base in a normal horizontal state, and the high-voltage lead portion of the T-shaped bushing duct can be transferred substantially vertically with the transport base being erected with the curved surface of the bottom as an axis, and at a predetermined location. The method of transporting a single-phase transformer includes the step of tilting the transportation platform about the curved surface of the bottom so that the T-shaped bushing duct is returned to the normal horizontal state.

The invention according to claim 4 provides a transportation method for transporting a single-phase transformer according to claim 1,
A transport anti-vibration member is interposed between the high-voltage lead portion and the inner peripheral portion of the T-shaped bushing duct, and the high-voltage lead portion protruding from the opening of the T-shaped bushing duct for each transformer tank is almost A bag-like airtight film is attached so as to be in close contact with each other to close each opening, a transportation protection cover is attached to each opening so as to cover the high voltage lead portion, and the T-shaped bushing duct is connected to the high voltage lead. After the completion of the transfer, each opening of the T-shaped bushing duct is connected to the corresponding first and second transformer tanks, and the transfer is completed. After completion, the airtight film is removed and the high voltage lead ends are attached to the first and second
A single phase including a step of attaching a lead supporting member for supporting the high-voltage lead portion by connecting to a connection point of a winding lead-out portion of the transformer, and removing the transportation vibration isolator after completion of the attachment. This is a transformer transportation method.

[0017]

Therefore, in the invention corresponding to claim 1, by taking the above-mentioned means, it is perpendicular to the bushing terminal portion forming the T-shaped bushing duct arranged in parallel between the first and second transformers. -Shaped high-voltage lead portions arranged and joined substantially linearly toward the first and second transformers, and the respective high-voltage lead ends are adjacent windings of the first and second transformers, respectively. Since it is connected to the connection point with the winding lead-out portion provided between the transformers, the high-voltage lead in the T-shaped bushing duct can be connected near the winding lead-out portion of each transformer, so that the insulation structure and after transfer can be improved. It is possible to simplify the assembling work.

Further, in the invention according to claim 2, since the high-voltage lead portion of the T-shaped bushing duct can be transferred in a state where it is erected in a substantially vertical state, in addition to the function corresponding to claim 1, the transport limit is increased. On the other hand, the maximum length of the high voltage lead can be obtained.

Further, the invention according to claim 3 uses a transportation platform having one end of the bottom portion formed into a curved surface, and the T-shaped bushing duct is accommodated in the transportation platform in a normally horizontal state, and the high-voltage lead of the T-shaped bushing duct is used. With the bottom part of the bottom surface curved so that the T-shaped bushing duct can be returned to the normal horizontal state when it arrives at a certain place, the bottom part of the bottom part of the bottom part can be transferred vertically. Since it is tilted about the axis, the work safety can be improved in addition to the effect corresponding to the first aspect.

Further, in the invention according to claim 4, the transport vibration isolating member is interposed between the high voltage lead portion and the inner peripheral portion of the T-shaped bushing duct, and the opening for each transformer tank in the T-shaped bushing duct is provided. The bag-like airtight film is attached so as to be in close contact with the high-voltage lead portion protruding from the section to close each opening, and the transport protection cover is attached to each opening so as to cover the high-voltage lead. The V-shaped bushing duct can be transferred in a state where the high-voltage lead section is erected substantially vertically, and after the completion of the transfer, each opening of the T-shaped bushing duct is connected to the corresponding first and second transformer tanks. After the completion of the connection, the airtight film is removed, and each high-voltage lead end is connected to the connection point of the winding lead-out parts of the first and second transformers to support the high-voltage lead part. Since the holding member is attached and the transportation anti-vibration member is removed after completion of the attachment, in addition to the action corresponding to claim 1, the transportation anti-vibration member eliminates displacement during transportation and the airtight film is T The quality can be improved by sealing the character-shaped bushing duct and ensuring moisture resistance and dust resistance in the assembly work after transfer.

[0021]

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

FIG. 1 is a plan view showing the structure of a single-phase transformer according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line XX in FIG. 1, which is the same as FIG. Are denoted by the same reference numerals and detailed description thereof will be omitted, and only different portions will be described here.

In this single-phase transformer, a high-voltage bushing duct 9 that narrows a high-voltage bushing 7 of 1000 kV branches left and right at the bushing electric field shield 11 portion and is connected to the duct joint 4a of the transformer tank 4 of each unit transformer 1A, 1B. It is connected. The position of the duct joint 4a is between the windings 3 that are connected in parallel and is near the high-voltage line end opening height of the windings 3 that has the same potential as the high-voltage lead 5.

The high-voltage lead 5 connecting the bushing terminal 7a and the winding lead-out portion 3a is wired in a substantially straight line, and the periphery thereof is wound around a multiple barrier (insulation barrier) 10. The high-voltage lead 5 is connected to the winding lead-out portion 3 a near the surface of the winding 3 and is supported by the lead support 12.

Next, a method of transporting the single-phase transformer having the above structure will be described with reference to FIGS. 3 to 6.

As shown in the plan view of FIG. 3, the high-voltage bushing duct 9 accommodates the high-voltage bushing 7, and the high-voltage lead 5 and the multi-barrier 10 of this high-voltage lead 5 are properly assembled together with the multi-barrier 10. The transportation vibration isolation members 15, 15a are provided between the high pressure bushing duct 9 and the inner peripheral portion thereof.
Are installed by interposing. The high pressure bushing 7 is also housed in the gas side duct 17.

Further, the high-voltage bushing duct 9 is provided with a bag-shaped airtight film 14 so that the high-voltage leads 5 and the multiple barriers 10 projecting from the openings for the transformer tanks 4 are closely attached to each other. It is blocked. Further, a cylindrical protective cover 16 for transportation is attached to each opening so as to cover the high voltage lead 5 and the multiple barrier 10.

Subsequently, the high-pressure bushing duct 9 is accommodated in the transportation frame 18 in a normally horizontal state. The transportation pedestal 18 has a curved end 18a at one end thereof.

Here, the transportation base 18 is rotated about the curved surface 18a at the bottom so that the high-voltage lead 5 of the high-pressure bushing duct 9 is substantially vertical, and as shown in the side view of FIG. It is hung from the support member 20 of the trailer via the and is transferred to a predetermined field foundation 13 while maintaining the above-mentioned rotation state.

When the vehicle arrives on the local foundation 13, the transportation platform 1
As shown in the side view of FIG. 5, the suspension 8 is rotated about the curved surface 18a at the bottom by the suspending wire 21 so as to return the high pressure bushing duct 9 to the normal horizontal state.

Thereafter, as shown in the side view of FIG. 6, each opening of the high-voltage bushing duct 9 is connected to each corresponding transformer tank 4, and after the connection is completed, the airtight film 14 is removed. Note that this connection is executed in the clean room 22.

Further, each high voltage lead 5 has an end connected to a connection point of the winding lead-out portion 3a of the first and second unit transformers 1A and 1B, and a lead support member 12 for supporting the high voltage lead 5 is provided. Mounted. After the mounting is completed, the transportation anti-vibration members 15 and 15a are removed.

As described above, according to this embodiment, the high voltage lead 5 connected to the bushing terminal 7a in the high voltage bushing duct 9 is substantially linear and the first and second unit transformers 1 are connected.
A and 1B are wired toward each other, and each high voltage lead end is adjacent to the winding 3 of the first and second unit transformers 1A and 1B, respectively.
Since it is connected to the connection point with the winding lead-out portion 3a provided therebetween, the high-voltage lead 5 in the high-voltage bushing duct 9 can be connected near the winding lead-out portion 3a of each transformer 1A, 1B. The disassembled part can be minimized, and the insulating structure and the assembling work after the transfer can be simplified, so that the insulating defect can be eliminated.

Further, since the high voltage lead 5 is aligned near the height of the winding lead-out portion 3a and is connected between the windings 3, it is shielded by the same potential surface of the adjacent windings 3 and is a transformer which is a ground electrode. The insulating structure for the surface of the tank 4 can be greatly simplified.

Further, the high pressure bushing duct 9 has a bushing 7, a high voltage lead 5 and a multiple barrier 1 for the high voltage lead.
When 0 is assembled normally, the high-pressure bushing duct 9 is rotated so that the high-voltage lead 5 is substantially vertical, and the high-pressure bushing duct 9 is transferred so as to maintain the rotated state. On the other hand, a high-voltage lead having the maximum lead length S can be obtained.

For example, when the high-voltage bushing duct 9 is transported in a horizontally assembled state as in the conventional case, the lead length of the high-voltage lead 5 is limited to about 3.2 m due to the transportation limit. On the other hand, according to the method of this embodiment, the high voltage lead 5
Since it is in a vertical state, the transport limit is eased,
The limitation of the lead length S of the high voltage lead 5 can be expanded to about 4.1 m.

Further, when the bushing 7, the high voltage lead 5 and the multiple barrier 10 of the high voltage lead 5 are properly assembled in the high pressure bushing duct 9 by using the transportation platform 18 having one end of the bottom portion formed into the curved surface 18a, The bushing duct 9 is accommodated in the transport pedestal 18 in a normal horizontal state, and the transport pedestal 18 is rotated about the curved surface 18a at the bottom so that the high voltage lead 5 of the high pressure bushing duct 9 is substantially vertical. It is transferred to the local foundation 13 so as to hold the rotated state, and when it arrives on the local foundation 13, the transportation pedestal 18 uses the curved surface 18a at the bottom as an axis so as to return the high pressure bushing duct 9 to the normal horizontal state. Since it is rotated by rotating, the safety and easiness of the work can be improved.

Further, the transport anti-vibration members 15 and 15a should be prevented from being displaced during transfer, and the airtight film 14 should seal the high-pressure bushing duct 9 to ensure the moisture-proof and dust-proof properties in the assembly work after the transfer. As a result, the insulation quality can be improved. Furthermore, during the assembly work after transfer,
Dry air is supplied to the transformer tank 4 and the high pressure bushing duct 9
By blowing the air inside, the moisture resistance can be further improved.

In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

[0040]

As described above, according to the first aspect of the present invention, the first and second transformers are arranged at right angles to the bushing terminal portion forming the T-shaped bushing duct that is arranged in parallel. Windings in which high-voltage lead portions are arranged and joined substantially linearly toward the first and second transformers, and the respective high-voltage lead ends are provided between adjacent windings of the first and second transformers, respectively. Since it is connected to the connection point with the wire outlet, the high-voltage lead in the T-shaped bushing duct can be connected near the winding outlet of each transformer, so that the insulation structure and the assembly work after transfer can be performed. A single-phase transformer that can be simplified can be provided.

According to the second aspect of the present invention, since the high-voltage lead portion of the T-shaped bushing duct can be transferred in a state where it is erected substantially vertically, the effect is the same as that of the first aspect and the transportation limit is increased. On the other hand, it is possible to provide a method for transporting a single-phase transformer that can obtain a maximum length of high voltage lead.

Further, according to the invention of claim 3, a T-shaped bushing duct is housed in the T-shaped bushing duct in a normal horizontal state by using a transportation platform whose one end is formed into a curved surface, and the high-voltage lead of the T-shaped bushing duct is accommodated. The part is almost vertical, and the transportation platform can be transferred while standing upright with the curved surface of the bottom as an axis,
When the vehicle arrives at a predetermined place, the transport base is tilted about the curved surface of the bottom so as to return the T-shaped bushing duct to the normal horizontal state.
Work safety can be improved.

Further, according to the invention of claim 4, a transport vibration isolating member is interposed between the high-voltage lead portion and the inner peripheral portion of the T-shaped bushing duct, and the opening for each transformer tank in the T-shaped bushing duct is provided. The bag-like airtight film is attached so as to be in close contact with the high-voltage lead portion protruding from the section to close each opening, and the transport protection cover is attached to each opening so as to cover the high-voltage lead. The V-shaped bushing duct can be transferred in a state where the high-voltage lead section is erected substantially vertically, and after the completion of the transfer, each opening of the T-shaped bushing duct is connected to the corresponding first and second transformer tanks. After the connection is completed, the airtight film is removed, and the high voltage lead ends are connected to the connection points of the winding lead-out parts of the first and second transformers to support the high voltage lead parts. Since the member is attached and the transportation vibration isolator is removed after the completion of the attachment, in addition to the same effect as in claim 1, the transportation vibration isolator eliminates displacement during transportation and the airtight film is T-shaped. By sealing the bushing duct and ensuring moisture resistance and dust resistance in the assembly work after transfer, it is possible to provide a method for transporting a single-phase transformer that can improve quality.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a single-phase transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in the embodiment.

FIG. 3 is a plan view of a T-shaped bushing duct for explaining the operation in the embodiment.

FIG. 4 is a side view for explaining the operation of the embodiment.

FIG. 5 is a side view for explaining the operation of the embodiment.

FIG. 6 is a side view of the single-phase transformer for explaining the operation in the embodiment.

FIG. 7 is a plan view showing the configuration of a conventional single-phase transformer.

[Explanation of symbols]

1A, 1B ... Unit transformer, 3 ... Winding, 4 ... Transformer tank, 5 ... High voltage lead, 7 ... High voltage bushing, 8 ... Medium pressure bushing, 9 ... High pressure bushing duct, 10 ... Multiple barrier, 11 ... Bushing electric field Shield, 12 ... Lead support, 13 ... Field foundation, 14 ... Airtight film, 15, 1
5a ... Transport anti-vibration member, 16 ... Transport protective cover, 18
... transportation stand, 18a ... curved surface, 19 ... hanging metal fitting, 20 ... supporting member, 21 ... hanging wire, 22 ... clean room.

Claims (4)

[Claims] 1. A first transformer tank containing a first transformer and a second transformer tank containing a second transformer are arranged such that their long sides face each other, and the first and second transformer tanks are arranged to face each other. A single-phase transformer in which a second transformer is connected in parallel via a T-shaped bushing duct, and a bushing terminal portion forming the T-shaped bushing duct arranged in parallel between the first and second transformers. The high voltage lead portions arranged at right angles are arranged and joined substantially linearly toward the first and second transformers, and the respective high voltage lead ends are adjacent to the first and second transformers, respectively. A single-phase transformer characterized in that it is connected to a connection point with a winding lead-out portion provided between the windings. 2. The transportation method for transporting a single-phase transformer according to claim 1, further comprising a step of enabling transportation in a state where the high voltage lead portion of the T-shaped bushing duct is erected substantially vertically. A method for transporting a single-phase transformer, characterized in that 3. The transportation method for transporting a single-phase transformer according to claim 1, wherein a transportation platform having one end of a bottom portion formed into a curved surface is used, and the T-shaped bushing duct is in a normal horizontal state on the transportation platform. The T-shaped bushing duct is accommodated in the T-shaped bushing duct so that the high-pressure lead portion of the T-shaped bushing duct can be transferred substantially vertically to the transportation platform while standing upright about the curved surface of the bottom portion. A method of transporting a single-phase transformer, comprising the step of tilting the transportation frame about the curved surface of the bottom so as to return the duct to the normal horizontal state. 4. The transportation method for transporting a single-phase transformer according to claim 1, wherein a transportation damping member is interposed between the high-voltage lead portion and an inner peripheral portion of the T-shaped bushing duct, A bag-like airtight film is attached so as to be in close contact with the high-voltage lead portion projecting from the opening for each transformer tank in the T-shaped bushing duct, and the opening is closed, and the high-voltage is applied to each opening. A protective cover for transportation is attached so as to cover the lead part, and the T-shaped bushing duct can be transferred with the high-voltage lead part standing upright substantially vertically. After completion of the transfer, each of the T-shaped bushing ducts can be transferred. The openings are connected to the corresponding first and second transformer tanks, and after completion of the connection, the airtight film is removed and the high voltage lead ends are connected to the first and second transformer tanks. A step of attaching a lead support member for supporting the high-voltage lead portion by connecting to a connection point of the winding lead-out portion of the second transformer, and removing the transportation vibration-damping member after completion of the attachment. A method for transporting a single-phase transformer, characterized in that