JPH03295209A - Transformer for split-transportation - Google Patents

Abstract

PURPOSE:To sharply reduce the size and weight of an iron core when it is assembled and transported by a method wherein the main leg, where a coil is attached, of a transformer core is split at the center part, two or more pieces of this core unit are arranged successively, and the cores are handled in two or more U-shaped core units in the state wherein the coil and the upper core yoke are removed. CONSTITUTION:An iron core 1 is divided into four picture-frame type core units 1A to 1D. The core unit IA is composed of the right and left legs 3a and 3b, the lower yoke 4a and the upper yoke 4b. The four core units 1A to 1D are arranged successively, and a coil 2 is attached to the main leg part composed of two adjacent core legs 3a. The upper and lower edges of both surfaces of the core legs 3a and 3b of each core unit are tapped, a leg cover plate 6 provided with protruding studs 6a is attached, and they are firmly bound and integrally formed together with leg punching plates 3a and 3b using a tape 9a. A yoke cover plate 7, which is fitted to the hole 6b of the right and left leg cover plates 6 and having a protruding pin 7a on the opposite side, is applied to both surfaces of the lower yoke 4a. On the upper and lower outside of the upper and lower yokes 4a and 4b of the core, core clamping fittings 8a and 8b, which orthogonally intersect with the punching plate, are attached to the stud or screw hole 6a provided on the upper and lower sides of the leg cover plate 6, and the core is fixed by tightening from the upper and lower sides.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a transformer core that can significantly reduce the size and weight of a transformer during factory assembly and transportation.

(Prior Art) In recent years, as the demand for electric power has increased, the voltage of power transmission systems has become higher, such as 500 KV, and the capacity of transformers used for power transmission and transformation has also increased. In addition, power transmission distances are becoming longer, and the transformers are often installed in mountainous areas where transportation conditions are even more severe, making it necessary to significantly reduce their transportation dimensions and weight.

Conventionally, for transformers installed in such locations, for example, in the case of a three-phase transformer, it is configured as three single-phase transformers, transported separately, and then transported on-site through a three-phase tank or a common duct. There is a split transport transformer configured as a three-phase transformer by connecting and coupling each single-phase transformer to form a three-phase connection.

Furthermore, there is a subdivided transport transformer method in which a transformer assembled in a factory is disassembled into various parts such as core legs, core upper and lower yokes, windings, and divided tanks, and then reassembled on site.

(Problem to be solved by the invention) When a 300MVA class transformer is constructed using a divided transport transformer method, it is common to divide it into three parts due to the on-site installation space and economic efficiency of the transformer, reducing the transport weight to about 60 tons. This is the limit. Therefore, there are problems such as the need for road reinforcement work including large-scale bridge reinforcement for local trailer transport after rail or ship transport, resulting in huge transport costs.

On the other hand, it is possible to transport subdivided and disassembled transport transformers from the factory to the site using general trailers without road reinforcement.

As with factory assembly, on-site work will require large-scale erection equipment to erect the core, which weighs over 100 tons, and foundation work to support and install it, after laying down the core legs and stacking the lower yoke.

Furthermore, since it takes a long time to reassemble the divided parts, the winding insulation absorbs moisture and requires a long drying process, which increases the transformer installation time and has drawbacks such as deterioration of the quality of the contents due to foreign matter contamination. .

The purpose of the present invention is to significantly reduce the transportation size and weight of each unit of a large-capacity, large-scale transformer that is transported separately, and to minimize the disassembly parts, thereby significantly shortening the assembly time on site and reducing the time required for assembly at factories and on-site assembly equipment. The objective is to obtain a disassembled transport transformer that improves assembly quality by simplifying and minimizing assembly parts.

[Structure of the invention]

(Means for Solving the Problems) The present invention divides the main leg to which the transformer core coil is attached approximately at the center in the width direction to form a two-legged core unit, and arranges two or more of these core units in sequence. Assemble the core, which is the largest size and weight of the transformer parts, by handling the core as a unit of two or more U-shaped cores with the coil and upper core yoke removed during factory assembly and disassembled transportation. Significantly reduces size and weight during shipping and transportation.

(Function) The transformer configured as described above can be transported in units of cores by disassembling the coil and core upper yoke. Therefore, a three-phase core is transported as a unit of four cores with the legs and lower yoke assembled in a U-shape. The iron core, which is a medium-sized and heavy part of a transformer, is approximately 1.
Since it is transported in small units of /4, even a 300MVA class transformer has a transport weight of less than 30 tons, making it possible to transport it on a general low-floor trailer. Furthermore, since the product is transported while standing up, there is no need to install a large-scale iron core erection device on site.

(Embodiment) A transformer core according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 8. In FIG. 1, an iron core 1 is divided into four frame-shaped iron core units 1^ to 10. Iron core unit IA
The left and right legs 3a, 3b, lower yoke 4a, upper yoke 4
Consists of b. The same applies to the other core unit 1B-10.

The coil 2 is attached to a main leg portion made up of two adjacent core legs 3a in which four core units IA-10 are arranged in sequence through a gap 5. Figures 2 to 8 show the core configuration, and studs 6a are threaded at the upper and lower ends of both sides of the core legs 3a and 3b of each core unit and protrude.
Apply the leg plate 6 with the tape 9a to remove the leg plate 3a,
Strongly binds and integrates with 3b. Here, the stand 6a may be configured to have a screw hole (not shown) in place of the stand without protruding above and below the contact plate.

On both sides of the lower yoke 4a, yoke abutment plates 7 having pins 7a that fit into the holes 6b of the left and right leg abutment plates 6 and protrude to the opposite side are firmly bound together with the lower yoke 4a using a tape 9b.

On the upper and lower outer sides of the upper and lower yokes 4a and 4b of the core, core tightening fittings 8a and 8b that are perpendicular to the punched plate are provided on the upper and lower sides of the leg support plate 6.To attach to studs or screw holes 6a, tighten the core from above and below. is fixed.

After each core unit IA-10 is assembled as shown in FIG. 7, lifting fittings 15 having pins and hanging ears 15a that fit with the sixes 6c of the leg abutment plate 6 are attached to both sides of the upper part of the core leg, and the wires 16 are fixed. and set it in the hanging lower tank 13a.

A lower content support device 10 is fixed to the bottom surface of the lower tank, which supports the lower yoke portions of the core units IA to ID from both sides and supports the coil 2 inserted into the core legs on its lower surface.

A lower yoke contact plate pin 7 is installed inside the lower content support device 10.
It is provided with a core fitting seat 10a that fits into the core holder 10a. After the core units IA to ID are lined up inside the lower core support device 10 using the centering seat 10a as a guide, the upper surface of the lower yoke contact plate pin 7a is tightened and fixed with a clamping fitting 10b. Lower contents support!
[A spacing piece is inserted between the inner surface of 10 and the lower yoke contact plate 7 to fix the lower yoke side surface of each core unit IA to ID in the length direction.

Each of the unit cores IA to ID is arranged in parallel with a spacing piece 12 interposed therebetween to ensure a gap 5. The coil 2 is inserted into a main leg portion made up of two adjacent iron core legs 3a. The coil 2 is supported by a lower yoke surface and a lower content support device 110 fixed to the bottom of the tank.

Upper yoke 4b of each unit core IA to ID is stacked on both sides of the upper yoke to tighten each unit core integrally! ! 11
Place the part between the legs with tape 9c and tighten the outer ends of the metal fittings 14.
Tighten to secure. The upper core tightening fitting 8b fixed to the upper end stud 6a of the contact plate 6 applied to both sides of the leg is placed and fixed on the upper surface of the upper inner body tightening device 10, so that the core and the upper and lower inner body tightening devices 10.11 are attached to the leg rest. It has a strong integral structure through the plate 5 to support the weight of the iron core and maintain the coil tightening force.

The coil 2 is tightened and supported in the vertical direction between the upper and lower contents support devices 10.11 and the upper and lower yokes 4a and 4b surfaces.

By adopting the iron core configuration explained in this example, the iron core, which is a large part of the weight of the transformer, is approximately 1
It becomes possible to set the weight to 74 or less. Furthermore, when transporting the iron core, the coil 2 and upper yoke 4b are removed and transported as shown in Figure 7, making it possible to further reduce the transport weight, even for a 300 MVA class transformer.
)-n or less.

FIG. 9 shows an example in which the lower tank 13a also serves as the lower content support fitting 10. The bottom surface of the lower tank 13a is configured in a concave shape, into which the unit cores IA to ID are inserted and fixed, and the coil 2 is fixed on the top surface. It was designed to be supported. Further, by connecting a pipe from an external cooler to the lower part of the coil 2 and configuring a duct 17 for introducing cooling oil to the coil 2, the structure can be further simplified.

FIG. 10 shows an example of the case where a three-phase five-leg iron core is assembled or transported in a two-part configuration, and is applied to small to medium capacity transformers. According to this method, the number of parts to be reassembled on-site can be further reduced, thereby shortening the on-site assembly period and reducing transportation costs.

〔Effect of the invention〕

As described above, according to the present invention, taking a three-phase, five-leg iron core as an example, it is not only possible to assemble or transport the core in units of four cores, but also to improve the core strength and coil clamping force. It is possible to obtain a highly reliable iron core that sufficiently retains the

In addition, the transport weight of the transformer is reduced to 30 OM with conventional split transformers.
The maximum capacity for large-capacity transformers of VA class or higher was about 59 tons. For this reason, a method was adopted in which transformers were loaded from the factory onto special freight cars and transported to a station near the substation, where they were then loaded onto a special trailer and transported into the substation. Bridge and road reinforcement work was required to transport heavy goods using trailers, which required a huge amount of money and time to investigate and study. - According to Rikiki's invention, it is possible to reduce the iron core, which is the heaviest load for transporting large-capacity transformers of 300MVA class or higher, to less than 30 tons, and a 30-ton low-floor trailer can be used to transport directly from the factory to the local substation without road reinforcement. It becomes possible to transport directly. Therefore, transportation costs can be significantly reduced, 1/10 of conventional costs.
It is also possible to do the following.

On the other hand, in the conventional split-type three-phase transformer, three single-phase cores are manufactured, but in the present invention, the three-phase five-legged core can be manufactured with the same configuration, so the core itself is approximately 273 mm in diameter compared to the split type. This makes it possible to provide a compact and low-cost transformer.

On the other hand, 600M for large-capacity pumped storage power plants built in mountainous areas.
In the case of a VA-class large-capacity transformer, even if the transport weight is about 50 tons, it must be constructed with 9 unit main transformers, which increases the space for installing the transformer, but according to the present invention, the transport weight can be reduced to 30 tons.
In addition to being able to reduce the amount of power to about 1,000 tons, the installation space can also be reduced to 172 mm or less since it can be configured as a normal three-phase transformer on site. Even in hydroelectric power plants, transformers are installed in underground buildings like generators, so reducing the space for installing transformers makes it possible to significantly reduce power plant construction costs.

In addition, 500KV large capacity transformers for substations are configured with three single-phase transformers due to transport weight restrictions for transformers, but according to the present invention, the maximum transport weight of the iron core can be reduced to about 30 tons. Therefore, it is possible to configure the system with a three-phase transformer, and the on-site installation space can be reduced to approximately 172.

As described above, according to the present invention, not only is it possible to significantly reduce transportation costs by reducing transportation weight, and completely eliminate the impact on public property and general traffic such as reinforcing roads and bridges and relocating building traffic lights, but also By minimizing the installation space of a substation, it is possible to significantly reduce construction costs.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of a three-phase, five-leg core according to an embodiment of the present invention, FIG. 2 is a front view showing an embodiment of a transformer core according to the present invention, and FIG. 3 is a side sectional view thereof. , Figures 4 to 6
The figures up to the figures are detailed views of the components of the present invention, FIG. 7 is a front view showing the state in which the transformer core according to the present invention is divided into unit cores, assembled or transported, FIG. 8 is a side view thereof, and FIG. 9 is a FIG. 10 is a front view showing a core and coil support structure in another embodiment of the present invention, and FIG. 10 is a front view showing a unit core assembly and transportation state in still another embodiment of the present invention. 1... Iron core IA~ID... Unit core 2... Coil 3a, 3b... Leg 4a
, 4b... Upper and lower yoke plates 6... Leg contact plates 6a, 6b... Contact plate studs, fitting holes 7.7a...
Yoke backing plate, pins 8a, 8b...core tightening fittings 9a, 9b, 9c...bind tape 10...
Lower contents support device W 11... Upper contents support device 10
a, 10b... centering seat, clamping fitting 12... spacing pieces 13a, 13b... upper and lower tanks 14... tightening fittings 15, 15a... hanging fitting, hanging ear 16... Wire rope 17, 17a...oil duct, oil inlet

Claims (1)

[Claims] Two or more two-leg iron core units are arranged side by side, the two adjacent legs are used as main legs, and a coil is attached to the main legs, and a plate is provided with studs that are threaded at the top and bottom ends of both sides of the core legs and protrude. (1) Attach the core fastening hardware perpendicular to the yoke punching plate to the upper and lower ends of the plate on the outside of the upper and lower yokes of the core. The lower yoke is tightened and supported, and yoke contact plates with protruding pins that fit into the holes of the left and right core leg contact plates and the centering seat of the content support device provided on the tank seat are placed on both sides of the lower yoke of the core, and the lower yoke is removed. Bind and fix the plate together with tape, sandwich the lower yoke part of the core, have a tightening fitting to fix the yoke plate pin, and fix the content support device to the bottom of the tank to support the coil at the bottom, and connect two or more cores as a unit. The coil attached to the main landing gear is tightened at the front and rear of the upper yoke by an integrated upper core tightening device, and the upper core clamping hardware is placed and fixed on the upper surface of the upper core tightener. Disassembled and transported transformers.