JPH06176931A - Decomposed and transported ship-insections transformer - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a transformer by a method wherein main legs of an iron core of the transformer are divided in nearly the center in the width direction to form square-shaped two-leg iron core units and the transformer is manufactured by arranging two or more iron core units in sequence and the iron core is handled in the unit of a U-shaped iron core at the time of assembly and transportation. CONSTITUTION:An iron core 1 is divided into four frame-like iron core units 1A-1D and the iron core unit 1A is constituted of right and left iron core legs 3a and 3b, a lower yoke 4a and an upper yoke 4b. The four iron core units 1A-1D are arranged in sequence through a gap 5. A coil 2 is installed at a main leg section that is constituted of the adjacent two iron core legs 3a and 3b. A backplate 6 having a stud 6a with projecting screws on its upper and lower sections is placed on both faces of each of the iron core legs 3a and 3b of one iron core unit and then the backplate 6 is bound into one body with the iron core leg 3a, 3b with a tape 9a. By this, the transportation cost can be reduced and an iron core having enough strength and a reliability can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer core capable of significantly reducing the size and weight of a transformer during factory assembly and transportation.

[0002]

2. Description of the Related Art In recent years, power transmission systems have become
In addition to higher voltage such as 500KV power transmission, the transformer used for power transmission and transformation is also increasing in capacity. In addition, the transmission distance has been lengthened, and the transformer is often installed in a mountainous area where the transportation conditions are more severe, and it is necessary to greatly reduce the transportation size and weight.

Conventionally, in the case of a transformer installed in such a place, for example, in the case of a three-phase transformer, it is configured as three single-phase transformers and is transported in a divided manner. There is a split transportation transformer that is configured as a three-phase transformer by connecting and coupling each single-phase transformer by a duct to perform three-phase wiring.

Furthermore, a transformer assembled in a factory is used as an iron core leg,
There is a subdivision transport transformer method in which parts such as the upper and lower yokes of the iron core, windings and split tanks are disassembled and subdivided, and these are reassembled on site.

[0005]

[Problems to be Solved by the Invention] When a transformer of 300 MVA class is configured by a split transportation transformer system, it is common to use up to 3 divisions because of the installation space and economical efficiency of the transformer.
The limit is about 60 tons. Therefore, there is a problem that road reinforcement work including reinforcement of large bridges is required for local trailer transportation after rail or ship transportation, and enormous transportation cost is required.

[0006] On the other hand, the subdivision transport transformer can be transported from the factory to the field without a road reinforcement by a general trailer. However, like the factory assembly, the weight is 100 after the iron core leg is laid down and the lower yoke is stacked. Large-scale erection equipment for erecting iron cores exceeding tons and basic work to support and install it are required.

Further, since it takes a long time to reassemble the divided parts, the winding insulation absorbs moisture, and a long drying process is required, so that the transformer installation period is increased and foreign matter is mixed, so that the quality of contents is deteriorated. There are drawbacks.

The object of the present invention is to greatly reduce the transport size and weight of each unit for high-voltage, large-capacity transformers to be split-transported, and to minimize the disassembled part, thereby significantly shortening the assembly period at the site and at the factory and site. It is an object of the present invention to obtain a disassembling and transporting transformer with improved assembly quality by simplifying assembly equipment and minimizing assembly parts.

[0009]

According to the present invention, a main leg on which a coil of a transformer iron core is mounted is divided into approximately two central portions in the width direction to form a square-shaped two-legged iron core unit, and two or more iron core units are sequentially arranged. At the time of assembling the factory and disassembling and transporting the core and the upper core yoke, the core is handled in units of two or more U-shaped cores with the coil and upper core yoke removed. And greatly reduce the size and weight during transportation.

[0010]

In transporting the transformer constructed as described above, the coil and the iron core upper yoke can be disassembled to transport in iron core units. Therefore, the iron core should be U
The three-phase iron core is transported as a unit of four iron cores while assembled in a letter shape. Since the iron core, which is the largest weight of the transformer parts, is transported in small units of approximately 1/4, even a 300 MVA class transformer can transport less than 30 tons and can be transported by a general low-floor trailer. Furthermore, since the transportation is performed while standing upright, it is not necessary to install a large-scale iron core standing up device on site.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transformer according to an embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the iron core 1 is divided into four frame-shaped iron core units 1A to 1D. Iron core unit 1A
Is composed of left and right iron core legs 3a and 3b, a lower yoke 4a and an upper yoke 4b. The same applies to the other iron core units 1B to 1D.

In the coil 2, four iron core units 1A to 1D are sequentially arranged via a gap 5 and attached to a main leg portion composed of two iron core legs 3a and 3b adjacent to each other. Therefore, the left and right iron core legs 3a and 3b are constructed by stacking blanks in a semicircular cross section. Up to FIG. 8, the structure of the iron core is shown. On both sides of the iron core legs 3a, 3b of each iron core unit, as shown in FIG.
The foot support plate 6 provided with a is applied to the iron core leg 3 with the tape 9a.
Strongly binds together with a and 3b. Here, the stud 6a may not be formed so as to project above and below the leg contact plate 6, but may be provided with a screw hole (not shown) instead of the stud 6a.

On both sides of the lower yoke 4a, as shown in FIG. 5, the yoke contact plates 7 electrically insulated from the left and right leg contact plates 6 are firmly bound and integrated with the lower yoke 4a by the contact tape 9b.

On the upper and lower outer sides of the upper and lower yokes 4b, 4a, iron core fastening fittings 8b, 8a orthogonal to the blank are attached to studs or screw holes 6a provided on the upper and lower sides of the leg contact plate 6, and the iron core legs 3a, Tighten and fix 3b from above and below.

After the iron core units 1A to 1D are assembled as shown in FIG. 7, a lifting metal fitting 15 and a yoke contact plate 18 are fitted on the left and right sides of the upper and lower parts of the iron core leg so that the holes 6b and the pins 6c of the leg contact plate 6 are fitted to the left and right. And are fixed, suspended by the wire 16, and set in the lower tank 13a.

On the bottom surface of the lower tank, the iron core units 1A-1
A lower content support device 10 for supporting the lower yoke 4a portion of D from both sides and for supporting the coil 2 inserted in the iron core leg on its lower surface is fixed.

Inside the lower content support device 10, there is provided a fixed seat 10a which fits with the pin 6c of the leg support plate 6. This fixed seat 10
Using the a as a guide, the iron core units 1A to 1D are arranged inside the lower content support device 10, and the upper surface of the pin 6c of the rear leg support plate 6 is clamped.
Secure with 10b. A spacing piece 10c is inserted between the inner surface of the lower content support device 10 and the lower yoke contact plate 7 to fix the side surfaces of the lower yoke of each of the iron core units 1A to 1D so as to be aligned in the longitudinal direction.

The unit cores 1A to 1D are arranged side by side with a spacing piece 12 therebetween to secure the gap 5. The coil 2 for inserting the coil 2 into the main leg portion composed of two adjacent leg iron cores 3a and 3b is placed and supported on the upper surface of the lower yoke 4a and the lower content support device 10 fixed to the tank bottom. It

The upper yokes 4b of the unit iron cores 1A to 1D are stacked, an upper content tightening device 11 for integrally tightening the unit iron cores is applied to both surfaces of the upper yoke 4b, and the inter-leg portions are taped 9c or studs (not shown). Bind and tighten both outer ends 14
Tighten and fix with. On the upper surface of the upper content fastening device 11, the upper iron core fastening metal fittings 8b fixed to the upper end studs 6a of the leg contact plates 6 placed on both sides of the legs are placed and fixed, and the iron core and the upper and lower content fastening devices 11, 10 are secured. Is made into an integral structure in terms of strength through the leg support plate 6 to support the weight of the iron core and hold the coil tightening force. Clamping and supporting of the coil 2 in the vertical direction are performed between the upper and lower contents supporting devices 11, 10 and the upper and lower yoke 4b, 4a surfaces.

By adopting the iron core structure described in this embodiment, it is possible to reduce the weight of the iron core, which is the maximum weight of the transformer, to about 1/4 or less of four iron cores in the case of the three-phase transformer. Further, when the iron core is transported, the coil 2 and the upper yoke 4b are removed for transportation as shown in FIG. 7, so that the transportation weight can be further reduced, and even the 300MVA class transformer can be reduced to 30 tons or less. Become.

In FIG. 9, the lower tank 13a has a lower content supporting metal fitting.
In this example, the bottom surface of the lower tank 13a is formed in a concave shape, and the unit iron cores 1A to 1D are inserted and fixed therein, and the upper surface supports the coil 2. Further, by connecting a pipe from an external cooler below it to form a duct 17 for taking in cooling oil to the coil 2 and the iron core 1, the structure can be further simplified. 17a is an oil guide hole.

FIG. 10 shows another example in which the forced cooling oil for the coil 2 and the iron core 1 is taken in. An oil duct which forms an oil passage with the lower content support device 10, the bottom surface of the lower tank 13a and the plate 18 is shown. By arranging 17, the external cooler can be easily connected to the coil and the iron core.

[0023]

As described above, according to the present invention, when a three-phase five-leg iron core is taken as an example, not only the iron core can be assembled or transported in units of four iron cores, but also the iron core strength or the coil can be improved. It is possible to obtain a highly reliable iron core that maintains sufficient tightening force strength.

Further, the transport weight of the transformer is limited to about 60 tons for the conventional split transformer and the large capacity transformer of 300 MVA class or more. Therefore, the transformer was loaded from a factory into a special freight car, transported to a station near the substation, and then transferred to a special trailer and carried into the substation. Due to transportation of heavy trailers, reinforcement work on bridges and roads was necessary, and it was necessary to spend enormous expenses and research and study time. On the other hand, according to the present invention, it is possible to reduce the iron core, which is the maximum weight of transportation, to 30 tons or less with a large capacity transformer of 300 MVA class or more, and a 30 ton low floor trailer from the direct factory to the local substation without road reinforcement. It is possible to transport directly. Therefore, the transportation cost can be significantly reduced and can be reduced to 1/10 or less of the conventional cost.

On the other hand, in the conventional split type three-phase transformer, three single-phase cores are to be manufactured. However, in the present invention, the three-phase five-leg iron core can be manufactured with the same structure, so that the core itself is different from the split type. Can be reduced to about 2/3, and a compact and low-cost transformer can be provided.

On the other hand, in the case of a 600 MVA class large-capacity transformer for a large-capacity pumped-storage power station built in a mountainous area, even if the transport weight is about 50 tons, it is necessary to construct it with 9-divided unit transformers, and the transformer installation space also increases. However, according to the present invention,
It can be reduced to about 30 tons and the installation space can be reduced to less than 1/2 because it is configured as a normal three-phase transformer locally. Since the transformer is installed in the underground building as well as the generator in the hydroelectric power plant, the reduction of the transformer installation space enables the huge cost reduction of the power plant construction.

Further, the 500 KV large capacity transformer for the substation is also configured with three single-phase units due to the transport weight limit of the transformer, but according to the present invention, the maximum transport weight of the iron core is about 30.
Since it can be reduced to about tons, it can be configured with a three-phase transformer, and the installation space on site can be reduced to about 1/2.

As described above, not only is it possible to significantly reduce the transportation cost by reducing the transportation weight, to reinforce roads and bridges, and to eliminate the effects on public objects and general transportation such as the relocation of building signals, By minimizing the installation space of the substation, it is possible to significantly reduce the construction cost.

[Brief description of drawings]

FIG. 1 is a schematic front view of an iron core showing an embodiment of the present invention.

FIG. 2 is a front view showing the configuration of an embodiment of the present invention.

FIG. 3 is a side view showing the configuration of an embodiment of the present invention.

FIG. 4 is a front view showing a contact plate of the iron core.

FIG. 5 is a side view of an essential part showing the configuration of an embodiment of the present invention.

FIG. 6 is a front view of a main portion showing the configuration of an embodiment of the present invention.

FIG. 7 is a front view showing a suspended state of the iron core according to the present invention.

FIG. 8 is a side view showing a suspended state of the iron core according to the present invention.

FIG. 9 is a side view showing the configuration of an embodiment of the present invention.

FIG. 10 is a side view showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

1 ... Iron core 1A-1D ... Unit iron core 2 ... Coil 3a, 3b ... Iron core leg 4b, 4a ... Upper and lower yoke plates 6 ... Leg plate 6a, 6b ... Plate stud, fitting hole 7 ... Yoke plate 8a, 8b ... Iron core tightening metal fittings 9a, 9b, 9c
... Binding tape 10 ... Lower content support device 11 ... Upper content support device 12 ... Spacing pieces 13a, 13b ... Up,
Lower tank 14 ... Tightening fitting 15 ... Hanging fitting 16 ... Wire rope 17 ... Oil duct

Claims (5)

[Claims] 1. When two or more two-leg iron core units are arranged in parallel, two adjacent legs are used as main legs, and when the coil is mounted on the main leg and the coil is transported, the disassembled coil and the iron core upper yoke are respectively independent. In addition, the rest of the iron core is transported as it is assembled as a U-shaped iron core unit, and the upper and lower ends of the iron core are provided with studs that are threaded and protruded, and the lower side has a pin and the upper side has a fitting hole. Disassembling and transporting transformer in which a foot support plate is placed and bound with tape together with the leg iron core. 2. The legs of the iron core and the yoke are fixed by fastening the iron core clamps, which are orthogonal to the blank of the yoke, on both outer sides of the upper and lower yokes of the iron core to the upper and lower studs of the leg contact plate. Item 1. The disassembling and transporting transformer according to Item 1. 3. A yoke contact plate, which is electrically insulated from the left and right leg contact plates, is arranged on both surfaces of the lower yoke of the iron core, and the lower yoke blank is fastened with a binding tape. Disassembled transport transformer. 4. A lower content supporting device for supporting a coil lower part is fixed to a tank bottom by sandwiching a lower yoke of an iron core between the lower pin of a leg contact plate and a fixing seat for fixing and a tightening metal fitting. Item 3. The disassembling and transporting transformer according to Item 3. 5. The two or more iron core units are fastened at their upper yoke portions by an upper content support device integrally formed in front and rear thereof, and the upper iron core tightening hardware is arranged and fixed on the upper surface of the upper content support device. The disassembling and transporting transformer according to claim 4, wherein