Power Transformer

Abstract

To provide a transformer for power supply that can stop the shake during transportation of the contents of a transformer stored in a transformer tank and reduce the size of the device.SOLUTION: Transformer bodies 21a and 21b including iron cores 22a and 22b, windings 26a1 and 26b1 wound around the iron cores 22a and 22b, and upper and lower clamps 23a1, 23a2, 23b1, and 23b2 fixed by steel strip bands 25a and 25b at the vertical positions of the iron cores 22a and 22b are stacked one above the other, and a leg member 34a is attached to the bottom of the lower clamp 23a2 of the transformer body 21b at a lower stage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technology for preventing the contents of a power transformer stored in a transformer tank from vibrating during transportation, etc., in a power transformer installed on a pole, and for reducing the size of the power transformer. [Background technology]

[0002] As shown in, for example, Non-Patent Document 1 below, a power supply transformer is installed on a pole as an accessory to an automatic switch that constitutes an automation system for power distribution lines, and supplies power to the automatic switch and to child stations and other devices that also constitute the automation system.

[0003] Specifically, the 6.6 kV of the distribution system is stepped down to 110 V and supplied as power to these. Non-Patent Document 1 below shows an example in which two power transformers are installed on poles. Each power transformer steps down 6.6 kV to 110 V to generate power for automatic switches, child stations, etc. [Prior art documents] [Patent documents]

[0004] [Non-Patent Document 1] Chubu Electric Power Technology Development News No. 142 / April 2011 [Non-Patent Document 2] Public Technical 2018-500127

[0005] In addition to the case where two power supply transformers are installed on a pole as described above, there are also power supply transformers that are configured by housing two transformer bodies in a single transformer case, as described in the above-mentioned Non-Patent Document 2.

[0006] 4 to 6 show the power supply transformer (hereinafter referred to as the conventional power supply transformer) described in the above Non-Patent Document 2. Fig. 4 is a vertical sectional view of the conventional power supply transformer as seen from the front.

[0007] As shown in Fig. 4, conventional power supply transformer A houses two transformer bodies 2a, 2b inside a transformer case 1. Housing two units has the advantage that it is no longer necessary to install a single power supply transformer on two poles.

[0008] The transformer bodies 2a, 2b have hollow rectangular iron cores 3a, 3b as their constituent elements, and upper clamps 5a, 5b, which are approximately U-shaped when viewed from the front, are attached to the upper yoke portions of the iron cores 3a, 3b so as to cover the upper yoke portions.

[0009] FIG. 5 shows the power supply transformer A. 4 5. As shown in FIG. 5, a pair of through holes 6a (6a1, 6a2), 6b (6b1, 6b2) are formed in the upper clamps 5a, 5b, and the fastening bands 7a, 7b are wound around the outer periphery of the iron cores 3a, 3b from the upper surfaces of the upper clamps 5a, 5b through one of the through holes 6a1, 6b1, and then drawn out from the other through hole 6a2, 6b2 to the upper surface side of the upper clamps 5a, 5b, and both ends of the fastening bands 7a, 7b are fastened with a fixing tool (not shown), whereby the upper clamps 5a, 5b are attached to the upper yoke parts of the iron cores 3a, 3b.

[0010] A pair of windings 4a (4a1, 4a2), 4b (4b1, 4b2) are wound around the leg iron parts of the cores 3a, 3b to which the upper clamps 5a, 5b are attached, respectively, to roughly constitute the transformer bodies 2a, 2b.

[0011] The transformer bodies 2a, 2b have nuts 8a, 8b fixed to the upper surfaces of the upper clamps 5a, 5b by, for example, welding, and upwardly-facing U-shaped fixing brackets 9 are disposed on the upper surfaces of the nuts 8a, 8b.

[0012] As shown in FIG. 5, through holes 10a, 10b are formed at the contact positions of the nuts 8a, 8b of the fixing bracket 9, and the fixing bracket 9 is fixed to the transformer bodies 2a, 2b by tightening the bolts 11a, 11b to the nuts 8a, 8b through the through holes 10a, 10b.

[0013] In addition, through holes 12a, 12b as shown in FIG. 1 are formed in the vertical portions 9a, 9b at both ends of the fixing bracket 9, and the fixing bracket 9 is fixed inside the transformer case 1 by clamping the vertical portions 9a, 9b at both ends of the fixing bracket 9 between nuts 13a, 13b fixed to the inner wall of the transformer case 1 and tightening bolts 14a, 14b.

[0014] As a result, the two transformer bodies 2a and 2b are fixed to the side wall of the transformer case 1 by the fixing brackets 9 in a state in which they are placed on the bottom surface 1a of the transformer case 1. Note that 15 shown in Figures 4 and 5 denotes insulating oil that is filled in the transformer case 1 for the purpose of cooling and insulating the transformer bodies 2a and 2b.

[0015] A recess 1b is formed in the center of the bottom surface 1a of the transformer case 1. When a transformer body is placed in the center of the transformer case 1 shown in Fig. 4, a protrusion on the underside of a lower clamp attached to a lower yoke part of the iron core constituting the transformer body fits into the recess 1b. This prevents the transformer body from swinging laterally inside the transformer case 1 as shown in Fig. 4.

[0016] However, as shown in Fig. 4, when two transformer bodies 2a, 2b are stored in the transformer case 1, the recess 1b is not used. The two transformer bodies 2a, 2b are placed on the bottom surface 1a around the recess 1b. Note that the lower clamps are omitted for the transformer bodies 2a, 2b to reduce costs.

[0017] Fig. 6 is a view of the power supply transformer A shown in Fig. 4 as seen from the Y direction. In Fig. 6, 16 indicates a low-voltage line drawn to a secondary terminal block 17 attached to the side of the transformer case 1. High-voltage lines drawn from the power distribution system to the transformer bodies 2a and 2b are omitted from the drawing.

[0018] The power supply transformer A shown in Figures 4 to 6 is manufactured and subjected to various tests and inspections at a factory, and then transported by vehicle or the like to the installation site. However, since the transformer bodies 2a, 2b are fixed only at the upper part by fixing brackets 9 as shown in Figure 4, the vibrations during transport cause the transformer to swing sideways as shown in Figure 4, with nuts 8a, 8b as fulcrums.

[0019] If the transformer bodies 2a, 2b swing laterally, this may result in damage to the transformer bodies 2a, 2b, breakage of the fixing points between the fixing brackets 9 and the transformer case 1, or the fixing points between the upper clamps 5a, 5b and the nuts 8a, 8b, or the two transformer bodies 2a, 2b may come into contact with each other and be damaged.

[0020] Therefore, an anti-vibration member 18 is arranged between the lower yoke parts of the iron cores 3a, 3b of the transformer bodies 2a, 2b to prevent the two transformer bodies 2a, 2b from being shaken laterally due to vibrations during transportation, etc.

[0021] The anti-vibration member 18 is fixed to the bottom surface 1a of the transformer case 1 by welding or the like. As described above, the bottom surface 1a has the recessed portion 1b, and as shown in Fig. 4, the anti-vibration member 18 is fixed to the bottom surface 1a so as to cross the recessed portion 1b.

[0022] In addition, anti-vibration member 18 can be made lighter and less costly by making its vertical cross section into a downward U-shape, as shown in Fig. 6. Anti-vibration member 18 formed in a U-shape has both open ends fixed to bottom surface 1a avoiding recess 1b, thereby preventing the lower parts of cores 3a, 3b constituting transformer bodies 2a, 2b from swinging toward each other.

[0023] In this way, the conventional power supply transformer A can be reliably prevented from being damaged or otherwise caused by the two transformer bodies inside the transformer case swinging and coming into contact with each other during transportation, etc. Summary of the Invention [Problem to be solved by the invention]

[0024] However, since the above-mentioned conventional power supply transformer A houses two transformer bodies 2a, 2b side-by-side inside the transformer case 1, the external dimensions of the transformer case 1 are inevitably large, as shown in Figure 5, and the transformer becomes large in size.

[0025] As described above, the power supply transformer is installed on a pole and, as an accessory to the automatic switch that constitutes the power distribution automation system, is installed around the automatic switch and the sub-stations, etc., so it is preferable that the size of the transformer is small, especially in the radial direction.

[0026] Therefore, the present invention provides a power supply transformer that can reduce the equipment size of the transformer while suppressing shaking of the transformer body within the transformer case during transportation. [Means for solving the problem]

[0027] The invention described in claim 1 is a transformer body including an iron core, a winding wound around the iron core, and upper and lower clamps fixed to the upper and lower positions of the iron core by steel bands. two Stacked Fix it , The uppermost clamp of the two-tiered transformer bodies is fixed to the inner wall of the transformer case that contains the transformer bodies with a fixing metal fitting, and This is characterized in that a leg member extending in a direction intersecting the longitudinal direction of the lowermost clamp is attached to the bottom surface of the lowermost clamp and the clamp is housed inside the transformer case. Effect of the Invention

[0028] According to the invention described in claim 1, since the two transformer bodies are housed in one transformer case, there is no need to install the two transformers separately on the poles.

[0029] Furthermore, since the transformer bodies housed within the transformer case are stacked one above the other, the external dimensions of the transformer case can be reduced, enabling the size of the equipment to be made more compact.

[0030] Furthermore, since leg members are attached to the bottom surface of the lowest clamp of the stacked transformer bodies, it is possible to reliably prevent the stacked transformer bodies from swaying sideways or tipping over when transporting the transformers, etc. [Brief description of the drawings]

[0031] [Figure 1] 1 is a longitudinal sectional view showing a power supply transformer according to the present invention, viewed from the front side. [Diagram 2] 1 is a vertical cross-sectional view showing a power supply transformer according to the present invention, viewed from above. [Diagram 3] 1 is a cross-sectional view showing a power supply transformer according to the present invention, as viewed from the side; [Figure 4] FIG. 1 is a longitudinal sectional view showing a conventional power supply transformer from the front side. [Diagram 5] FIG. 1 is a vertical cross-sectional view showing a conventional power supply transformer from above. [Figure 6] FIG. 1 is a cross-sectional view showing a conventional power supply transformer from the side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a vertical cross-sectional view of a power supply transformer of the present invention as viewed from the front side.

[0033] 1, power supply transformer B of the present invention houses two transformer bodies 21a, 21b inside transformer case 20. Specifically, transformer body 21b is housed inside transformer case 20 stacked on top of transformer body 21a.

[0034] Hereinafter, the transformer body 21a is the lower transformer body, and the transformer body 21b is the upper transformer body. and By housing two transformer bodies 21a, 21b in one transformer case 20, it is not necessary to install two power supply transformers housing one transformer body on poles, as in the conventional power supply transformer A.

[0035] The transformer bodies 21a and 21b are constituted by hollow rectangular cores 22a and 22b, and an upper clamp 23a1 formed in a substantially U-shape in front view is attached to an upper yoke part of the core 22a so as to cover the upper yoke part. Also, a lower clamp 23a2 formed in a substantially upward U-shape in front view is attached to a lower yoke part of the core 22a so as to cover the lower yoke part.

[0036] An upper clamp 23b1 having an approximately U-shape when viewed from the front is attached to the upper yoke portion of the iron core 22b so as to cover the upper yoke portion, and a lower clamp 23b2 having an approximately upward U-shape when viewed from the front is attached to the lower yoke portion of the iron core 22b so as to cover the lower yoke portion.

[0037] Fig. 2 is a view of the power supply transformer B of the present invention as seen from the X direction shown in Fig. 1. As shown in Fig. 2, a pair of through holes 24b (24b1, 24b2) is formed in the upper clamp 23b1 of the upper transformer body 21b, and a pair of through holes (not shown) is similarly formed in the lower clamp 23b2.

[0038] Fastening band 25b is passed from the top surface of upper clamp 23b1 through one of the through holes 24b1, wound around the outer periphery of iron core 22b, passed through the underside of lower clamp 23b2 through one of the through holes (not shown) of lower clamp 23b2, passed through the other through hole (not shown) of lower clamp 23b2, and then wound around the outer periphery of iron core 22b, pulled out from the other through hole 24b2 of upper clamp 23b1 to the upper surface side of upper clamp 23b1, and both ends of fastening band 25b are fastened with a fixing device (not shown), thereby attaching upper clamp 23b1 and lower clamp 23b2 to the upper yoke portion and lower yoke portion of iron core 22b.

[0039] The upper clamp 23a1 and the lower clamp 23a2 of the lower transformer body 21a also have a pair of through holes (not shown).

[0040] Fastening band 25a is passed from the top surface of upper clamp 23a1 through one of the through holes, wrapped around the outer periphery of iron core 22a, passed through the underside of lower clamp 23a2 through one of the through holes, not shown, of lower clamp 23a2, and then passed through the other through hole, not shown, of lower clamp 23a2, after which fastening band 25a is wrapped around the outer periphery of iron core 22a and pulled out from the other through hole of upper clamp 23a1 to the upper surface side of upper clamp 23a1. Both ends of fastening band 25a are fastened with a fixing device, not shown, thereby attaching upper clamp 23a1 and lower clamp 23a2 to the upper yoke portion and lower yoke portion of iron core 22a.

[0041] A pair of windings 26a (26a1, 26a2) are wound around each leg of core 22a to which upper clamp 23a1 and lower clamp 23a2 are attached, thereby roughly forming lower transformer body 21a.

[0042] Further, a pair of windings 26b (26b1, 26b2) are wound around each of the leg iron portions of the core 22b to which the upper clamp 23b1 and the lower clamp 23b2 are attached, thereby roughly forming the upper transformer body 21b.

[0043] Upper clamp 23a1 of lower transformer body 21a and lower clamp 23b2 of upper transformer body 21b are fixed with bolts 27 and nuts 28, thereby mounting upper transformer body 21b on lower transformer body 21a.

[0044] As shown in FIG. 3, the transformer bodies 21a, 21b stacked in this manner have bolts 29a, 29b fixed to the upper surface of the upper clamp 23b1 of the upper transformer body 21a by welding or the like, and an upwardly U-shaped fixing bracket 30 is disposed on the upper surfaces of the bolts 29a, 29b.

[0045] The fixing bracket 30 has through holes 31a, 31b as shown in FIG. 2, and the fixing bracket 30 is fixed to the upper transformer body 21b by passing bolts 29a, 29b through the through holes 31a, 31b and tightening nuts 32a, 32b from above the fixing bracket 30.

[0046] As shown in FIG. 3 , the vertical portions 30a, 30b at both ends of the fixing bracket 30 are fixed to nuts 33a, 33b fixed to the inner wall of the transformer case 20 by welding or the like, whereby the stacked upper and lower transformer bodies 21a, 21b are fixed within the transformer case 20.

[0047] As a result, the two transformer bodies 21a, 21b are stacked on the bottom surface 20a of the transformer case 20 and fixed to the side wall of the transformer case 20 by the fixing brackets 30. In Fig. 1 and Fig. 3, 34 denotes insulating oil that is filled in the transformer case 20 for the purpose of cooling and insulating the transformer bodies 21a, 21b.

[0048] The power supply transformer B of the present invention configured as described above is manufactured and subjected to various tests and inspections at a factory, and then transported by vehicle or the like to the installation site and installed on site. However, since the stacked transformer bodies 21a, 21b are fixed only at the upper part by fixing bracket 30 as shown in FIG. 3, vibrations during transportation and installation will cause them to swing in the horizontal direction as shown in FIG. 1, with nuts 33a, 33b shown in FIG. 3 as fulcrums.

[0049] If the transformer bodies 21a, 21b swing laterally, this may cause damage to the transformer bodies 21a, 21b, or damage to the fixing points between the fixing bracket 30 and the transformer case 20, the fixing points between the upper clamp 23b1 of the upper transformer body 21b and the nuts 29a, 29b, and the connection points between the lower clamp 23b2 of the upper transformer body 21b and the upper clamp 23a1 of the lower transformer body 21a.

[0050] Normally, the lower transformer body 21a is placed in the central position of the transformer case 20 shown in Figure 1, and a protrusion formed by pressing out a part (central part) of the lower surface of the lower clamp 23a2 of the lower transformer body 21a is fitted into a recess 20b formed in the central part of the bottom surface 20a of the transformer case 20, thereby preventing the stacked transformer bodies 21a, 21b from swinging laterally in the transformer case 20 as shown in Figure 1.

[0051] However, when the lower transformer body 21b is structured as in the present invention in such a way that the tightening band 25a passes through the central portion of the underside of the lower clamp 23a2 to fix the lower clamp 23a2 to the iron core 22a, as described above, a part (the central portion) of the underside of the lower clamp 23a2 cannot be pressed out to form a convex portion, and the convex portion cannot be fitted into the concave portion 20b.

[0052] Therefore, in the present invention, leg members 35a, 35b are attached to the lower surface of lower clamp 23a2 of lower transformer body 21b, extending in a direction intersecting the longitudinal direction thereof.

[0053] The leg members 34a, 34b may be fixed to the lower surface of the lower clamp 23a2 of the lower transformer body 21a by welding or the like. As described above, the bottom surface 20a of the transformer case 20 has the recess 20b, and the leg members 34a, 34b are arranged to cross the recess 20b as shown in FIG.

[0054] As described above, the power supply transformer B of the present invention can reliably prevent the transformer bodies 21a, 21b housed in the transformer case 20 from shaking within the transformer case and being damaged during transportation, installation, etc.

[0055] In particular, two transformer bodies 21a, 21b stacked one on top of the other have a high center of gravity and are therefore prone to tipping over due to shaking during transportation, etc.; however, in the present invention, the presence of leg members 34a, 34b attached to the lower transformer body 21a and the fixing bracket 30 attached to the upper transformer body 21b reliably prevents the transformer bodies 21a, 21b from shaking side to side or tipping over within the transformer case 20.

[0056] Furthermore, in the present invention, since the transformer bodies 21a, 21b are stacked vertically, the external dimensions of the transformer case 20 can be made smaller than those of the conventional power supply transformer A, making it possible to reduce the size of the equipment. [Explanation of symbols]

[0058] 1,20 Transformer case 1a, 20a Bottom of transformer case 1b,20b Recess 2a, 2b, 21a, 21b Transformer body 3a,3b,22a,22b iron core 4a1,4a2,4b1,4b2,26a1,26a2,26b1,26b2 Windings 5a, 5b, 23a1, 23b1 Upper clamp 6a(6a1,6a2) ,6b(6b1,6b2),24b(24b1,24b2) Through hole 7a, 7b, 25a, 25b Tightening band 8a, 8b, 13a, 13b, 28, 31a, 31b, 32a, 32b Nuts 9,30 Fixing bracket 9a,9b,30a,30b Vertical parts at both ends 10a,10b,12a,12b,31a,31b through hole 11a, 11b, 14a, 14b, 27, 29a, 29b Bolts 15,34 Insulating oil 16 Low voltage lines 17 Secondary side terminal block 18 Anti-vibration member 23a2,23b2 Lower clamp 35a,35b Leg members A,B Power supply transformer

Claims

[Claim 1] A power supply transformer comprising a transformer body comprising an iron core, a winding wound around the iron core, and upper and lower clamps fixed by steel bands at the top and bottom of the iron core, stacked in two tiers and secured together, the top clamp of the stacked transformer bodies being secured to the inner wall of a transformer case containing the transformer bodies by fixing metal fittings, and a leg member extending in a direction intersecting the longitudinal direction of the clamp being attached to the bottom surface of the bottom clamp, and the transformer body being housed within the transformer case.

Images