JPH06349641A - Disassembled transport type transformer and transporting method thereof - Google Patents

Abstract

PURPOSE:To reduce the transport weight and dimension by a method wherein a duct is formed by dividing a central main leg at the width central line while the junction ends of yokes are formed into inverse triangular shaped cavities assuming the width central end as the apexes thereof to be separated from each other so that junction iron cores may be quick insertably and disconectably provided into the cavities. CONSTITUTION:An angle shaped central main leg 10 with upper and lower junction ends making an angle of almost 45 deg. from the width central line to the inside is composed of two central main leg iron cores 4 divided by the width central line so as to form a cooling duct 1 on the divided surface. Besides, a yoke part is composed of two pairs of yokes 5, 6 magnetically coupling with outside main legs 9 and the central main leg 10 as well as inverse triangular junction iron cores 7, 8 to be inserted into inverse triangular shaped cavities formed on the front end of the central main leg 4. Through these procedures, a tripod iron core can be divided into two part thereby enabling the on-site installation work to be performed within a short time as well as the insulation reliability to be further enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disassembled transport type transformer for disassembling the contents of a large transformer, transporting it to the site, and assembling it, and a transportation method thereof.

[0002]

2. Description of the Related Art With the increase in voltage and capacity of transformers, their transportation weight and size tend to increase. In particular, since land transportation is subject to transportation restrictions such as railroads and roads, the weight of a transformer that can be assembled and transported is within 200 tons. Therefore, the tank is divided, and the main body such as the winding and the iron core, which constitute the contents, are disassembled and transported, and then reassembled on site.

FIG. 9 is a block diagram showing a magnetic circuit of a three-phase three-leg iron core, and FIG. 10 is a block diagram showing a magnetic circuit of a three-phase five-leg iron core.
The iron core of the three-phase transformer has three main legs 31 as shown in FIG.
And 32 and 33, a tripod core consisting of upper yokes 34 and 35 and lower yokes 36 and 37 connecting the iron cores of these main legs, respectively, and three main legs 41 as shown in FIG. And 42 and 43, two side leg cores 44 and 45, and four leg upper and lower yokes 46, 47, 48 and 49 respectively connecting the main leg and side leg cores to each other. There is.

The main magnetic flux Φ _U of each phase of the iron core of the three-phase transformer,
Between Φ _V and Φ _W ,

[0005]

[Equation 1]

There must be a vector relationship that satisfies However, the tripod core shown in FIG. 9 cannot be divided into independent magnetic circuits that satisfy the above conditions. For this reason, conventionally, the tripodal core has not been applied for disassembled transportation.

FIG. 11 is a structural diagram of an iron core when a three-phase five-leg iron core is divided into four independent magnetic circuits.
The leg-shaped iron cores 51, 52, 53, and 54 are each composed of two main legs and a yoke, and the condition of the above-mentioned formula 1 is satisfied. However, the iron core shown in FIG. 11 has a drawback in that harmonic magnetic flux flows through each iron core independent of the magnetic circuit, and the iron core loss increases. In addition, the five-leg iron core transformer is uneconomical because of its larger weight and size than the three-leg iron core transformer.

[0008]

As described above, in the three-phase three-leg iron core, between the main magnetic fluxes Φ _U , Φ _V , and Φ _W of each phase of the iron core,
Although it cannot be divided into independent magnetic circuits that satisfy the condition of Equation 1, in the case of a disassembled five-leg iron core as shown in FIG. 11 in which a three-phase five-leg iron core is divided into four independent magnetic circuits. , This condition is satisfied. However, the magnetic flux of higher harmonics flows through each iron core independent of the magnetic circuit, and the core loss increases, so that the five-leg iron core transformer is uneconomical because of its larger weight and size than the three-leg iron core transformer. Moreover, there has been a problem that the tripodal iron core has not been conventionally applied for disassembly and transportation.

The present invention has been made in view of the above points, and can significantly reduce the transport weight and the transport dimension, easily perform the on-site installation work in a short time, and further improve the insulation reliability. It is an object of the present invention to provide a three-phase transformer and a transportation method thereof.

[0010]

The means for solving the above-mentioned problems in the present invention is to form upper and lower joint ends of the left and right outer main legs at approximately 45 degrees toward the inner side, and to form both upper and lower ends of the central main leg. The joint end is formed at an angle of about 45 degrees inward from the center line of the width, and the upper and lower joint ends of the left and right outer main legs and the central main leg are joined by overlapping the different first and second yokes, respectively. Shape three phase 3
In a three-phase transformer having leg iron cores and windings wound around each of the main legs, the central main leg is divided into two parts from the width center line to form a duct, and the first and second The joint ends of the yoke are separated from each other by forming an inverted triangular gap with the tip of the width center of the central landing gear as the apex, and the inverted triangular joint core can be inserted into and removed from this inverted triangle gap. To be installed.

Further, it is preferable that the left and right outer main legs are divided into two from the width center to form a duct.

At the time of transportation, the first and second yokes of the upper part (or the lower part) of the three-phase transformer, the upper and lower joint cores, and the windings of each main leg are removed, and the central main leg is separated to separate two sets. No U-shaped iron core, and then the lower (or upper) yoke and the outer main leg and one of the separated center main legs are integrated with the fastening metal fitting and the fastening metal fitting that is separable from this fastening metal fitting. Then, transport the product by tightening the end part on the side where the yoke is removed with the transport temporary tightening fitting.

[0013]

As described above, during transportation, the winding, the upper (or lower) yoke, and the upper and lower joining cores are removed, and only the central main leg of the main legs of the iron core on which the winding is mounted is divided into two in the longitudinal direction, The divided central main leg and the outer main leg and the lower (or upper) yoke that connects the divided central main leg and the outer main leg are fixed via the divided fastening fittings, respectively, and two sets of The U-shaped iron core is used, and the upper (or lower) yoke removed, the triangular joint iron core, the iron core stand, and the winding are transported separately. For local assembly, these two sets of U-shaped iron cores are aligned with the divided surfaces of the central main landing gear and the lower (or upper) triangular joining iron core is inserted to form the connecting fastening bracket and the iron core stand for connection. Three-phase three-leg iron core by connecting via the upper leg (or lower) yoke and the triangular joint iron core and connecting it via the upper (or lower) clamp Since the transformer is configured, the binding work of the main iron core legs on site is only one for the three legs in the case of the five-leg iron core, and since the upper and lower joint iron cores are small triangular pieces, insertion into the iron core is easy. As a whole, the work of packing the yokes on-site takes less time than in the case of the five-legged iron core, so the on-site construction period can be shortened due to the reduction of man-hours, and it is also possible to carry out the transportation to locations with severe transportation conditions.
Enables disassembly and transportation of the leg iron core.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a block diagram of a three-phase three-leg iron core of an embodiment of the disassembled transport type transformer of the present invention, which is composed of silicon steel plates of seven types of shapes. Since the structure of the iron core is vertically symmetrical, the lower part from the central part is omitted.

The left and right U-phase and W-phase outer main legs 9 and 9 are formed in a trapezoidal shape with their upper and lower joint ends facing inwardly at an angle of about 45 degrees, and are arranged to the left and right of the width center line. It is divided into outer core 2 and inner core 3 of the outer main leg, and a cooling duct 1 is formed on this divided surface. In addition, the V-phase central landing gear 10
Is composed of two central main landing gear cores 4 and 4 divided from the width center line, with the upper and lower joint ends being formed into a chevron with an angle of approximately 45 degrees toward the inside from the width center line, and the cooling duct 1 is formed on the divided surface. Form. The yoke portion includes two parallel sides, a side joined to the joint end of the outer main leg, a side joined to one central main leg core 4 of the central main leg 10, and the central main leg cores 4 and 90. Two pairs of yokes A, A'which are formed into a pentagon having sides directed outward and magnetically couple the outer main leg 9 and the central main leg 10;
The yokes A, A'and an inverted triangular joint iron core B for magnetically coupling the U phase and the W phase by inserting them into the inverted triangular voids formed at the tips of the central main legs 4, 4. Has been done. The yokes A and A'and the bonded iron core B are composed of the yoke steel plates 5 and 6 and the bonded iron core plates 7 and 8, and 5 and 6 or 7 and 8 respectively.
Have the same shape or take a lap margin (lap joint) for joining steel plates, and therefore the dimensions differ by the lap margin.

The cooling duct 1 is provided on the width center line of the main leg of the iron core, and the joining iron core B for connecting the triangular phases is provided at the center of the yoke so that the iron core main leg can be divided into two parts. That is, during transportation, if the triangular joint core B in the center of the yoke is extracted, the main landing gear core 10 can be divided into two parts at the center. As a result, most of the three-phase, three-leg iron cores can be assembled at the factory, and it is possible to assemble the transformer cores with a minimum of man-hours at the site.

FIG. 2 is a front view showing a mode in which a three-phase three-leg iron core divided into two parts is transported. The outer main leg 9 and the central main leg iron core 4 of the central main leg 10 are integrated by binds 11 and 12, respectively. The lower yoke A is integrated by the bind 14 and is tightened by the lower tightening fitting 15 and the connecting tightening fitting 16 to form a U-shaped iron core 17. Further, temporary fastening fittings 18 for transportation are passed over the upper ends of the outer main leg 9 and the central main leg iron core 4 during transportation, and are fastened from both sides so that the iron core 17 is fixed so as not to be deformed by the acceleration applied during transportation. A spacer 19 is inserted in the cooling duct 1 of the outer main leg 9 to maintain the gap. The lower tightening fitting 15 and the connecting tightening fitting 16 are indicated by Di in the figure.
Although they are connected at points, they can be removed, and are removed when the lower joint core B is inserted locally. The U-shaped iron core 17 divided into two parts can be transported by rail to the large-capacity device in a state of being laid sideways, which is advantageous for transportation where there is a height limit. The upper yoke (the upper yokes A and A'and the upper joint core B) and the lower joint core B are extracted and transported separately together with the winding.

FIG. 3 is a side view showing an example of the iron core stand, and FIG. 4 is a state in which two sets of U-shaped iron cores 17 are joined together by aligning the central portions of the central main legs 10 and a triangular joined iron core B is inserted. ,
That is, a plan view showing a state in which the U-shaped iron core 17 is laid down sideways, and FIGS. 5 and 6 show the mountain-shaped 3 by connecting the lower yoke portions.
It is a front view and a side view showing a state in which the leg iron core is erected upright, both showing an assembly procedure in the field.

As shown in FIG. 3, the iron core upright stand 20 is a stand 2
1 and an auxiliary stand 22 which is attached after inserting the lower joining iron core B, and the U-shaped iron core 17 transported in two parts on the stand 21 of the iron core upright stand 20 is laid down in a lying state, Match the level of the left and right iron cores 17, 17.

Next, as shown in FIG. 4, of the lower tightening metal fittings, the portion (communication tightening metal fitting 16) located at the joint between the central main leg 10 and the lower yoke is removed. Insert the triangular joint core B into the center of the lower yoke. This completes the magnetic circuit of the lower yoke section. Then, the U-shaped iron cores 17, 17 which are divided into two parts and transported, the central main landing gear cores 4,
A spacer 23 is inserted between them.

Next, as shown in FIG. 5, the connecting clamps 16, 16 removed in the above process are reattached and connected to the lower clamps 15, 15 on both sides of the iron core.
Attach and fix 4. And the central main landing gear 10 of the iron core
To bind the left and right main landing gear cores 4, 4 together, bind 2
Tighten with 5. As a result, the iron core is firmly integrated. Here, as shown in FIG. 3, one end (left end in FIG. 3) of the iron core upright base 20 in which the auxiliary base 22 is attached to the base 21 is lifted to erect the iron core, and the iron core is placed on the surface plate. As shown in FIG. 6, the iron core leg 9 is fastened by the bind 11 to the iron core in the upright state, and the lower fastening member 15 and the iron core stand 24 are attached to the lower portion of the iron core.

FIG. 7 is a front view showing the work of fitting the windings. The windings 26 separately transported to the main legs 9 and 10 of FIG.
Are fitted into the outer main legs 9 and 9 of the iron core and the central main leg 10.

FIG. 8 is a front view showing the work of forming the upper yoke portion. The upper yokes A, A'and the upper joint core B are inserted and tightly tightened by binding, and an upper tightening metal fitting (not shown). ) To form a three-phase three-leg iron core transformer.

As described above, during transportation, the winding 26 and the upper yokes A and A'and the joining core B connecting the upper and lower phases are removed, and the central main leg of the iron core on which the winding 26 is mounted is removed. The central main leg iron cores 4 and 4 and the outer main leg 9 which are obtained by dividing only the leg 10 into two in the longitudinal direction and the lower yoke A that connects the divided central main leg iron core 4 and the outer main leg 9 Lower fastening fitting 15 and connecting fastening fitting 16 which are divided respectively
Two sets of U-shaped iron cores 17, 17 fixed via the upper part, upper yokes A, A ', upper and lower joining iron cores B, and connecting tightening for connecting the lower tightening metal fittings 15. Attachment 16
, The iron core stand 24 and the winding 26 are separately transported, and these two sets of U-shaped iron cores 17, 17 are locally combined with the divided surfaces of the central main landing gear cores 4 and 4 to form a lower triangular shape. The connecting iron core B is inserted and connected via the connecting tightening metal fitting 16, the iron core base 24 is attached, and then the winding wire 26 is attached to each main leg,
A three-phase three-leg iron core transformer is constructed by inserting the upper yokes A and A'and the upper triangular joint core B and tightening them through the upper tightening metal fittings.

[0025]

EFFECTS OF THE INVENTION Since the structure is as described above, (1) the tripod core can be disassembled and transported, and a compact and low loss transformer can be provided.

(2) The large-capacity transformer can be transported to a place with severe transportation conditions.

(3) The binding work of the main core leg of the iron core on site is one for three legs in the case of the five-leg iron core, and since the joining iron core connecting the upper and lower phases is a small piece of triangular shape, it cannot be inserted into the iron core. It is simple, and since the work of packing the yokes on site as a whole can be done in less time than in the case of a 5-leg iron core, the man-hours can be reduced and the on-site construction period can be shortened.

Excellent effects such as the above can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a three-phase three-leg iron core of an embodiment of a disassembled transportation type transformer of the present invention.

FIG. 2 is a front view showing a form of a disassembled transport type transformer of the present invention during transportation of a two-divided three-phase three-leg iron core.

FIG. 3 is a side view showing an example of the iron core stand of the embodiment of the disassembled transport type transformer of the present invention.

FIG. 4 two sets of U's of a split-transport transformer embodiment of the present invention.
FIG. 6 is a plan view showing a state in which the iron cores of the shape are joined together by aligning the central portions of the central main landing gears and the joined iron cores are inserted, and the iron cores are laid down.

FIG. 5 is a front view showing a state in which the lower yoke portion of the embodiment of the disassembling and transporting type transformer of the present invention is connected to be upright as a mountain-shaped tripod core.

FIG. 6 is a side view showing a state in which the lower yoke portion of the embodiment of the disassembled transport type transformer of the present invention is connected and is made upright as a mountain-shaped three-leg iron core.

FIG. 7 is a front view showing the work of fitting the winding wire in the embodiment of the disassembled transport type transformer of the present invention.

FIG. 8 is a front view showing an operation of inserting the upper yoke piece of the embodiment of the disassembled transport type transformer of the present invention.

FIG. 9 is a configuration diagram showing a magnetic circuit of a conventional three-phase three-leg iron core.

FIG. 10 is a configuration diagram showing a magnetic circuit of a conventional three-phase five-leg iron core.

FIG. 11 is a configuration diagram when a conventional three-phase five-leg iron core is divided into four independent magnetic circuits.

[Explanation of symbols]

 1 ... Cooling duct 2 ... Outer main landing gear outer core 3 ... Outer landing gear inner core 4 ... Central main landing gear core 5, 6 ... Yoke steel plate 7, 8 ... Bonding iron core steel plate 9 ... Outer landing gear 10 ... Central main landing gear 11, 12, 14, 25 ... Bind 15 ... Lower fastening fitting 16 ... Communication fastening fitting 17 ... U-shaped iron core 18 ... Temporary fastening fitting for transportation 19, 23 ... Spacer 20 ... Iron core stand 21 ... Stand 22 ... Auxiliary stand 24 … Iron core base 26… Winding A, A ′… Yoke B… Joined iron core

Claims (3)

[Claims] 1. The upper and lower joint ends of the left and right outer main landing gears are formed inward at approximately 45 degrees, and the upper and lower joint ends of the central main landing gear are formed at approximately 45 degrees inward from the center line of the width. , The upper and lower joint ends of the left and right outer main legs and the central main leg are separately joined by overlapping first and second yokes to form a frame-shaped three-phase three-leg iron core, and winding is applied to each of these main legs. A three-phase transformer in which the central main landing gear is divided into two parts from a width center line to form a duct, and the joint ends of the first and second yokes have a width of the central main landing gear. A divided transport type transformer characterized by forming an inverted triangular void having the central tip as an apex and separating the voids from each other, and installing an inverted triangular bonded iron core into the inverted triangular void so that the core can be inserted and removed freely. . 2. The split transportation type transformer according to claim 1, wherein the left and right outer main legs are divided into two parts from the width center to form a duct. 3. The first and second yokes of the upper part (or the lower part) of the three-phase transformer according to claim 1 or 2 and the upper and lower joint cores and windings of each main leg are removed, and the central main leg is separated. And two sets of U-shaped iron cores, then the lower part (or the upper part)
Tighten the yoke and the outer main landing gear and one of the separated main landing gears integrally with the fastening metal fitting and the connecting fastening metal fitting that is separable from the fastening metal fitting. A method of transporting a disassembled transport type transformer, characterized in that it is fastened with a temporary fitting for transportation and transported.