JP3393503B2 - Transformer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer installed in a power plant, a substation or the like and used for power transmission and power reception.

[0002]

2. Description of the Related Art FIG. 20 is a structural view showing an example of the internal structure of a conventional outer iron type transformer. This configuration is
A 5-legged iron core is assumed at 500 kV and 1000 MVA used for power reception. In the figure, 1a, 1
b, 1c are U, V, W three-phase coils, and the U-phase coil is composed of a high-voltage coil 5a and a low-voltage coil 6a.
The same applies to the phase and the W phase. Hereinafter, the coil portion will be collectively referred to as coil 1 when collectively referred to. Two
Is a high voltage side connecting lead of each phase, 3 is a low voltage side connecting lead of each phase, and 7 is an iron core. FIG. 20 shows the upper front part of the coil 1 by cutting out the insulating barrier member,
The actual structure of each phase is box-shaped like the inner part.

FIG. 21 is a plan view of the coil 1 and the iron core 7 as seen from the upper surface of FIG. FIG. 22 is a plan view of the iron core 7 having the five-leg shape shown in FIG. 5-legged iron core 7
Is an end core leg 8 of the end block, an end core yoke 9, an iron tongue 10 arranged at the center of the coil 1, an inner core yoke 11 of the inner block, and an interphase core 12 arranged between the phases of the coil 1. Is formed by.

Next, the assembly of the contents of the transformer will be described. FIG. 23 shows the shape of the lower tank in which the lower part of the coil 1 is housed. The lower tank 14 has a wide flange 14a on which an iron core is placed on a portion where the lower portion of the coil is accommodated and an upper portion.
Are formed. FIG. 24 shows the coil 1 in the lower tank 14.
It shows the situation of incorporating. FIG. 25 shows a state in which the core tongue support plates 15a, 15b and 15c for supporting the iron core tongue 10 are inserted after the coil 1 is incorporated in the lower tank 14. FIG. 26 shows the iron core 7 after the coil 1 is incorporated.
Shows the situation of stacking. FIG. 27 shows the joints of the corners of the iron core, for example, the joints of the iron core legs 8 and the iron core yokes 9 which are alternately lapped by the R dimension, and shows the situation. Are laminated by alternately wrapping R dimension.

To assemble the contents, the coils 1 of the respective phases are incorporated in the lower tank 14 as shown in FIG. 24, and then the iron core tongue support plates 15a, 15b, 1 and 1 are attached to the windows of the coil 1 as shown in FIG.
5c is inserted, and as shown in FIG. 28, the flange 14a portion of the lower tank 14 and the iron core tongue support plates 15a, 15
A long, thin silicon steel sheet iron core 7 having a thickness of about 0.35 mm is laminated on the upper portions of b and 15c by lapping the corner portions as shown in FIG. 27, and the inner portion is assembled. After assembling the contents, a middle tank and an upper tank (not shown) are assembled, each component is attached, and a transformer is assembled.

The wrap size R of the iron core is such that when an excessive current flows through the coil, a mechanical force is generated in the coil in the axial direction to cause the iron core 7 to move.
Force acts to push the core open, but the core wrap dimension R
It is strongly supported by the frictional force of the portion, and suppresses the deformation of the coil 1.

When a failure occurs during use of the transformer,
In some cases, disassembling and internal inspection are required. In this case, disassembling work is performed in the reverse order of the assembling procedure. 28, 29, and 30 show the state of dismantling work. When disassembling, first, the filling oil is drained, each part is removed, the upper tank and the middle tank are removed, and the contents are exposed. Next, as shown in FIG. 28, the respective members of the iron core 7 are sequentially removed from the upper part, and as shown in FIG.
After removing a, 15b, and 15c, the coil 1 is lifted as shown in FIG. 30, and the coil 1 is inspected.

[0008]

As described above, in the conventional transformer, when the coil is assembled, a thin silicon steel plate having a length of several meters and a thickness of about 0.35 mm, which constitutes the iron core 7, is difficult to carry. While wrapping around the corner at the corner 1
The work of laminating one by one was required, and a long period and a lot of labor were required. Also, when it becomes necessary to inspect the contents, the work opposite to that at the time of assembly is required, and when disassembling for inspection, it takes a long period of time and much labor as at the time of assembly. It was

The present invention has been made in order to solve the above-mentioned problems, and the assembling work and the disassembling work can be performed in a short time, and when a failure that requires inspection of the contents occurs,
The purpose is to provide a transformer that can be disassembled in a short time and can be inspected quickly.

[0010]

According to a first aspect of the present invention, a transformer is provided with connecting portions at positions on both sides exceeding the iron core tongue width of an iron core yoke connected to an end portion of an iron core tongue that penetrates a hollow portion of a coil. An iron core yoke is formed by the iron core yoke coupling member and the iron core yoke end member.

According to a second aspect of the present invention, in the transformer, the positions on both sides exceeding the width of the iron core tongue of the iron core yoke of each phase connected to the end of the iron core tongue of each phase penetrating the hollow portion of the coil of each phase. Each of them is provided with a connecting portion, and the iron core yoke is formed by the iron core yoke connecting member and the iron core yoke end member.

In the transformer according to the third aspect of the present invention, the core tongue of the connecting member of the iron core yoke and the connecting portion with the end member of the iron core yoke are formed in a substantially W shape in a direction inclined with respect to the core layer direction. The left and right sides of the core tongue are arranged symmetrically, and the ends of the core tongues are alternately shifted from each other, and the core yoke coupling members are laminated upside down.

A transformer according to a fourth aspect of the present invention uses a transformer manufactured by punching a pair of two iron core yoke coupling members into a shape in which the mountain-shaped portions are intermeshed with each other. Is.

In the transformer according to claim 5 of the present invention, the contents of the transformer are inspected by removing the iron core yoke coupling member, pulling out the iron core tongue penetrating the hollow portion of the coil, and lifting the coil. Is.

In the transformer according to claim 6 of the present invention, the contents of the transformer are inspected by removing the iron core yoke coupling member and lifting the coil together with the iron core tongue penetrating the hollow portion of the coil. is there.

[0016]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. In power plants, substations, etc., the transformers connected to the power grid are absolutely unacceptable for power outages, and the equipment used there requires absolute reliability. However, transformers and the like are absolutely no exception, and absolute reliability is required, and even if a failure should occur, prompt recovery is required. Delayed recovery will prolong power outages and become a social problem. In the case of a conventional transformer, when a failure that requires coil inspection occurs, disassembling the iron cores one by one as described above requires a long time for disassembling, which requires a lot of labor and a short period of time. It is difficult to recover between them. The present invention enables quick disassembly, inspection and assembly.

1 to 3 show the first embodiment of the present invention.
2 shows the configuration of the contents of the transformer of FIG. 1 is a configuration diagram of the contents, FIG. 2 is a plan view of the coil portion of FIG. 1 seen from above, and FIG. 3 is a plan view of the iron core portion of FIG. In the figure, the coil 1, the high-voltage side connecting lead 2, the low-voltage side connecting lead 3, the high-voltage coil 5 and the low-voltage coil 6 are the same as the contents of the conventional transformer, and the description thereof will be omitted. 20 is an iron core.
The iron core 20 is composed of each member as shown in FIG. Two
1 is an end iron core leg, 22 is an iron core yoke end member, 23
Is an iron core yoke central member, 24 is an iron core yoke connecting member, 2
5 is an iron core tongue, and 26 is an interphase iron core.

Next, in the first embodiment. The assembling procedure of the transformer will be described. As shown in FIG. 4, each block of the iron core is laminated for each block. The iron cores may be stacked on a flat plate stand or on a lower tank. As in the conventional example, as shown in FIG. 27, the connecting portions of the respective members of the respective iron cores are laminated by lapping the indicated R on each sheet of the iron core. If the work is done in a flat free working space, the workability will be good, the application of automatic machines will be easy, and the work efficiency will be improved. Next, as shown in FIG. 5, among the stacked core blocks, the core yoke coupling member 24 and the core tongue 25 are arranged.
The end iron core leg 21, the iron core yoke end member 22, and the iron core central member 23 of each member except for are placed at predetermined positions on the lower tank flange 14a of the lower tank 14.

Next, as shown in FIG. 6, the coil 1 is sequentially inserted into the window portion of the placed iron core. Next, as shown in FIG. 7, the iron core tongue 25 separately laminated on the window portion of the coil 1.
Insert. Next, as shown in FIG. 8, the iron core yoke coupling member 24 is laminated between the iron core yoke end member 22, the iron core yoke central member 23, and the iron core tongue 25. As shown in FIG. 9, the core yoke coupling member 24 and the other members of the iron core coupled to each other are alternately displaced by the R dimension, and the core yoke coupling members 24 are alternately laminated on the front and back sides. The state in which the contents are assembled is as shown in FIG. The middle tank, the upper tank and the parts are attached to the state of FIG. 10 to complete the assembly.

Further, when disassembling and inspecting the contents of the transformer, the disassembling procedure is the reverse of the above assembling procedure. The disassembly procedure will be described. First, the parts are removed, and the upper tank and the middle tank are removed to expose the contents of FIG. Next, as shown in FIG. 11, the iron core yoke coupling members 24 of each phase are pulled out one by one using L metal fittings as shown in FIG. Next, as shown in FIG. 12, the iron core tongue 25 block at the center of the coil 1 of each phase is pulled out, and all the structures in the coil are removed. By suspending the coil 1 for each phase in this state, the outer peripheral surface and the inner peripheral surface of the coil can be inspected.

As described above, the structure of the core of the transformer is divided into the core yoke end member 22, the core yoke center member 23, and the core tongue coupling member 24, and each core member is divided into core members. Assemble the core part by making it possible to stack at another place, dividing the iron core stacking work at another place, combining it with the coil part in the block state, and finally stacking the iron core yoke coupling member The work can be efficiently performed in a short time. Further, at the time of overhaul and inspection, the coil portion can be lifted by disassembling only the portion of the iron core yoke coupling member 24, so that an effect that it can be quickly performed even when internal inspection is required is obtained.

Embodiment 2. Embodiment 1. Then, the case of three phases is shown, but this embodiment 2. Is an embodiment in the case of a single phase. FIG. 15 is a configuration diagram showing the configuration of the transformer contents. FIG. 16 is a plan view of the coil portion viewed from above. FIG. 17 is a plan view showing the structure of the iron core portion.
In the figure, 38 is a coil and 30 is an iron core. Similarly to the iron core leg 31, the iron core yoke end member 3
2, an iron core yoke coupling member 34, and an iron core tongue 35. This Embodiment 2. Also in the single-phase transformer according to the first embodiment. As in the case of the three-phase, in the case of assembly, each member of the core portion 30 is laminated at another place,
On the flange 37a of the lower tank 37, the iron core tongue 3
5, and each member except the core yoke connecting member 34 is placed at a predetermined position, the coil 1 is inserted into the window portion of the core, the core tongue 35 is inserted into the central window portion of the coil 1, and the core yoke 34 is laminated. The contents part is assembled by doing. It is assembled by attaching a middle tank and an upper tank to the outer periphery of the contents and attaching parts.

When disassembling and inspecting the contents of the transformer, the disassembling procedure is the reverse of the above assembling procedure. First, the parts are removed, the upper tank and the middle tank are removed to expose the contents, and the iron core yoke coupling member 34 of each phase is attached by using L metal fittings as shown in FIG.
Remove each one. Next, the core tongue 3 at the center of the coil 1
Pull out the 5 blocks and remove all the structures in the coil 1. By suspending the coil 1 in this state, the outer peripheral surface and the inner peripheral surface of the coil can be inspected.

With the above-mentioned configuration, the first embodiment.
As in the case of the three-phase transformer described above, the internal parts can be assembled efficiently and in a short time. Further, at the time of overhaul and inspection, by disassembling only the iron core yoke coupling member 34, the coil Since the part can be lifted,
Even if internal inspection is required, disassembly inspection can be performed quickly.

Embodiment 3. Embodiment 1. And Embodiment 2. The shape of the iron core yoke coupling material 24 or 34 having the above-mentioned configuration has a poor yield rate, and this embodiment 3.
Relates to a method of processing the core yoke connecting member 24 or 34. Iron core yoke coupling member 24 or 34
As shown in FIG. 9, two mountain shapes are arranged side by side, and one of the triangles has a trapezoidal shape in which the wrap R dimension is elongated. As shown in FIG. 18, the mountain-shaped portions of the iron-core yoke coupling members 24 or 34 are punched out at the same time with the mountain-shaped portions meshed with each other. By plate-cutting and punching in this way, it is possible to process with good yield. The strips of 29 are scrap.

Fourth Embodiment Embodiment 1. , And Embodiment 2. Then, in the lifting operation at the time of inspecting the coil after disassembly, all the members in the window portion at the center of the coil were removed and the lifting tool was used to lift the coil.
Iron core tongue 25 to lift the coil when dismantling.
While the wire is left in the center of the coil, a hanging wire is hung on the lower portion of the iron core tongue support plate 27 to lift it. In this way, the disassembling work time of the iron core tongue is not required at the time of disassembling inspection, and the time to start inspection of the coil is shortened.

[0027]

In the transformer according to the first aspect of the present invention, the connecting portions are provided at the positions on both sides of the iron core tongue which penetrates the hollow portion of the coil and is connected to the end of the iron core tongue. Since the iron core yoke is formed by the member and the end member of the iron core yoke, the assembling work of the inner part can be efficiently performed in a short time, and at the time of overhaul and inspection, by disassembling only the iron core yoke connecting member part. Since the coil part can be lifted, it can be quickly performed even when internal inspection is required.

In the transformer according to the second aspect of the present invention, the width of the iron core tongue of the iron core yoke of each phase connected to the end portion of the iron core tongue of each phase penetrating the hollow portion of the coil of each of the three phases is exceeded. Since the core yoke is formed by the core yoke connecting member and the iron yoke end member, the connecting parts are provided at the positions on both sides, so that the contents can be assembled efficiently and in a short time. Since the coil portion can be lifted by disassembling only the iron core yoke coupling member portion, it can be quickly performed even when internal inspection is required.

According to a third aspect of the present invention, in the transformer, the joint between the core tongue of the coupling member of the core yoke and the end member of the core yoke is formed in a substantially W shape in a direction inclined with respect to the core layer direction. The left and right sides of the core tongue are arranged so that the end portions of the core tongue are staggered alternately, and the core yoke coupling members are laminated by reversing the front and back for each lamination. It is possible to make a lap portion on both sides and laminate them with one type of member.

Since the transformer according to the fourth aspect of the present invention is formed by using two iron core yoke coupling members as a set and punching into another shape, the portions formed in the mountain shape are engaged with each other. The material yield of the iron core yoke coupling member is improved.

In the transformer according to the fifth aspect of the present invention, the contents of the transformer are inspected by removing the iron core yoke coupling member, pulling out the iron core tongue penetrating the hollow portion of the coil, and lifting the coil for inspection. , The disassembling work time when inspecting the coil is shortened, and the coil inspection work can be performed quickly.

In the transformer according to claim 6 of the present invention, the contents of the transformer are inspected by removing the iron core yoke coupling member and lifting the coil together with the iron core tongue penetrating the hollow portion of the coil. , The disassembling work time when inspecting the coil is shortened, and the inspection work of the coil can be performed more quickly.

[Brief description of drawings]

FIG. 1 is a first embodiment of the present invention. It is a block diagram of the contents part of the three-phase transformer of.

FIG. 2 is a plan view of a content portion of FIG.

3 is a plan view of the iron core portion of FIG. 1. FIG.

FIG. 4 is a diagram showing a stacked state of iron cores when assembling the contents of the three-phase transformer of FIG. 1.

FIG. 5 is a diagram showing a state in which the iron core of the three-phase transformer of FIG. 1 is placed on the upper surface of the flange of the lower tank when assembling the contents.

6 is a diagram showing a state in which the coil of the three-phase transformer of FIG. 1 is inserted into the lower tank.

7 is a diagram showing a state in which the iron core tongue of the three-phase transformer of FIG. 1 is inserted into the window portion of the coil.

8 is a diagram showing a stacked state of the iron core yoke coupling member of the three-phase transformer of FIG.

FIG. 9 is an explanatory diagram of a lap portion when the iron core yoke coupling members are laminated.

10 is a diagram showing a state in which the contents are exposed when the three-phase transformer of FIG. 1 is disassembled.

FIG. 11 is a diagram showing a disassembling work state of the iron core yoke coupling member in the state of FIG. 10;

FIG. 12 is a view showing a detached state of the iron core tongue in the state of FIG.

13 is a diagram showing a state in which the coil is lifted after removing the iron core yoke coupling member and the iron core tongue in the state of FIG.

FIG. 14 is an explanatory diagram of a method for removing the iron core yoke coupling member.

FIG. 15 is a second embodiment. It is a block diagram of the content part of the single phase transformer of.

16 is a plan view of a content portion of FIG.

17 is a plan view of the iron core portion of FIG. 15. FIG.

FIG. 18 is a diagram showing a planing state of a material of the iron core yoke coupling member.

FIG. 19 is a state diagram showing a state in which the coil can be lifted and inspected without removing the iron core tongue of the coil window.

FIG. 20 is a configuration diagram showing the configuration of the contents of a conventional three-phase transformer.

21 is a plan view of a content portion of FIG. 20. FIG.

22 is a plan view of the iron core shown in FIG. 20. FIG.

23 is a view showing the shape of the lower tank of FIG.

FIG. 24 is a diagram showing a coil insertion state at the time of assembling the three-phase transformer of FIG. 20.

FIG. 25 is a diagram showing an insertion state of the iron core support plate at the time of assembling the three-phase transformer of FIG. 20.

FIG. 26 is a diagram showing a situation of iron core removal work at the time of disassembling the three-phase transformer of FIG. 20.

FIG. 27 is an explanatory diagram showing a situation in which a corner portion of an iron core is wrapped.

FIG. 28 is a diagram showing a state of disassembling work of the iron core of the three-phase transformer of FIG. 20.

FIG. 29 is a state diagram when the iron core support plate is removed after disassembling the iron core of the three-phase transformer of FIG. 20.

FIG. 30 is a diagram showing a coil lifting state at the time of inspection after disassembling the three-phase transformer of FIG. 20.

[Explanation of symbols]

1 coil, 2 high voltage side connecting lead, 3 low voltage side connecting lead, 5 high voltage coil, 6 low voltage coil, 20 iron core,
21 end core legs, 22 core yoke end members, 2
3 iron core yoke central member, 24 iron core yoke coupling member, 25 iron core tongue, 26 iron core tongue, 27 iron core tongue support plate, 28 lifting tool, 29 L metal fitting, 30 iron core, 31 iron core leg, 32 iron core yoke end member, 3
4 iron core yoke coupling member, 35 iron core tongue, 37 lower tank, 38 coil.

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-6-176931 (JP, A) JP-A-7-245216 (JP, A) JP-A-63-78509 (JP, A) JP-A-59- 16318 (JP, A) JP-A-7-122436 (JP, A) JP-A-6-349641 (JP, A) Actually developed 59-29017 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/245 H01F 30/12 H01F 41/00 H01F 27/02

Claims (6)

(57) [Claims] 1. An iron core comprising a coil, an iron core tongue that penetrates through the hollow portion of the coil, an iron core leg that forms a magnetic path on the outer periphery of the coil, and an iron core yoke that forms a magnetic path between the iron tongue and the iron core leg. The core yoke is composed of and, and the iron core yoke is connected to the end of the core tongue that penetrates the hollow part of the coil, and the connecting parts are provided on both sides beyond the width of the core tongue. A coupling member,
A transformer characterized by being formed of an iron core yoke end member connected to an iron core leg. 2. A three-phase coil, an iron core tongue that penetrates the hollow part of each of the three-phase coils, an iron core leg that forms a magnetic path around the outer periphery of the coil of each phase, and an iron core tongue and an iron core leg. The core is composed of a core yoke that forms a magnetic path between the core core yoke and the core, and the core core yoke is connected to the end of the core tongue of each phase that penetrates the hollow part of the coil of each phase. The three-phase transformer is characterized in that connecting portions are provided at positions on both sides exceeding the width of the core to form an iron core yoke connecting member that is connected to the iron core tongue, an iron core yoke end member that is connected to the iron core leg, and an iron core yoke intermediate member. vessel. 3. An iron core tongue of the iron core yoke coupling member and a connecting portion of the iron core yoke end member with a wrap portion which is provided in a direction inclined with respect to the iron core layer direction, and has a substantially W-shaped asymmetrical shape. 3. The transformer according to claim 1, wherein the iron core tongue is formed so that the end wrap portions of the iron core tongue are alternately offset from each other, and the iron core yoke coupling member is turned upside down for each stacking. 4. The iron core yoke coupling member is manufactured by punching a pair of two pieces into a shape in which the mountain-shaped portions are intermeshed with each other. The transformer described in either one. 5. The transformer according to claim 1 or 2, wherein the contents of the transformer are inspected by removing the iron core yoke coupling member, extracting the iron core tongue penetrating the hollow portion of the coil, and lifting the coil. vessel. 6. The transformer content inspection is performed by removing the iron core yoke coupling member, leaving the iron core tongue penetrating the coil hollow portion, and lifting the coil together with the iron core tongue for inspection. The transformer described in 2.