CN208368322U - Off circuit tap changing transfor mer core assemblies - Google Patents

Abstract

The utility model discloses a kind of off circuit tap changing transfor mer core assemblies, including metab, iron core is provided on the metab, the iron core includes vertically disposed core limb and across the iron yoke being arranged at the top of it, winding is arranged on the core limb, folder square tube and lower folder square tube are respectively arranged on the outside of the upper and lower ends of the winding, in parallel across being arranged on the outside of the both ends of winding, and the axis perpendicular of its central axes and iron core, described two above press from both sides folder square tube under square tubes and two and fasten each by screw rod, the upper folder square tube and lower folder square tube apply opposite active force to the winding always.The utility model offsets the radial forces between winding by the clamping action of upper folder square tube, lower folder square tube, middle position square tube；Cooling oil channel, which makes it possible to the winding overhang sharply to generate heat, to be cooled down well；Under the premise of ensuring that core assemblies comply with standard, solve the problems, such as that the winding of the prior art loosens and generates heat.

Description

Off circuit tap changing transfor mer core assemblies

Technical field

The utility model relates to Transformer technical field more particularly to a kind of iron cores of off circuit tap changing transfor mer Component.

Background technique

Transformer is one of most important electrical equipment in electric system, and voltage can be got higher or be lower by height by low by it. In order to reduce the power loss or the loss of voltage on transmission line of electricity, therefore transformer must be generally used on the transmission line.Become There are many kinds of depressors, for regulating transformer, is generally adopted by the off circuit tap changing transfor mer of three winding formula at present.

But in use process, when transformer three-phase suddenly-applied short circuit at the terminal of secondary winding, short circuit current is very big, Such as electric substation or switching station's band baseline will this thing happens when closing a floodgate.Although the transient process of suddenly-applied short circuit is very It is short, but huge impact circuit will make the winding of transformer by very big electromagnetic force.It is secondary due to electromagnetic force and electric current Side is directly proportional, therefore tens or hundred times when the electromagnetic force that is subject to of winding is by for rated current when short circuit.In addition, huge Electric current will make winding sharply generate heat, thus have very big destructiveness to winding and its insulation.Further, since inside and outside winding voltage Not contour reason, the low pressure winding including causing can generate inward radial force, and high-voltage winding outside can generate outward Radial force, the force direction of the two is entirely opposite.These power can be also transmitted in iron yoke, if the winding pressure in iron yoke Tight device is not firm or winding impaction state is bad, then easily causes the damage of winding.

Utility model content

Purpose of the utility model is to solve above-mentioned technical problems, and propose a kind of nothing that service life is elongated The core assemblies of excitation adjustable transformer.

To achieve the goals above, the utility model adopts the technical scheme that

A kind of off circuit tap changing transfor mer core assemblies, including metab are provided with iron core on the metab, institute Iron core is stated to include vertically disposed core limb and be arranged with winding in the iron yoke being arranged at the top of it, the core limb, from It is low pressure winding and high-voltage winding respectively from inside to outside, folder square tube and lower folder is respectively arranged on the outside of the upper and lower ends of the winding Square tube, the upper folder square tube and lower folder square tube are respectively two, in parallel across being arranged on the outside of the both ends of winding, and its axis The axis perpendicular of line and iron core, described two above press from both sides folder square tube under square tubes and two and fasten each by screw rod, the upper folder Square tube and lower folder square tube apply opposite active force to the winding always.

Preferably, the upper folder square tube is identical with lower folder square tubular shape, includes a cooling oil channel in pipe.

Preferably, the inside of the upper folder square tube and lower folder square tube is arranged in the fastening nut of the screw rod.

Preferably, support column is vertically welded between the upper folder square tube and lower folder square tube of the same side.

Preferably, the support column of the same side is two, is separately positioned between three-phase windings.

Preferably, middle position square tube, the side of the middle position square tube are fixed with by screw on the support column of the same side It is tightly attached to the outer surface of the winding, includes a cooling oil channel in pipe.

Preferably, it is described it is upper folder square tube, it is lower folder square tube, middle position square tube periphery be coated with insulating layer.

Preferably, pass through timber lining transmitting forces, the lower folder square tube and institute between the upper folder square tube and the winding It states by timber lining transmitting forces between winding, the timber lining structure is identical, including disc-shaped body and projection are in body end The protrusion that face one is enclosed is arc transition between the protrusion and disc-shaped body inside.

Compared with prior art, the utility model has following the utility model has the advantages that by upper folder square tube, lower folder square tube, middle position The clamping action of square tube and the special construction of timber lining offset the radial forces between winding；Cooling oil channel makes it possible to The winding overhang sharply to generate heat can be cooled down well；Under the premise of ensuring that core assemblies comply with standard, solve existing The problem of winding of technology is loosened and is generated heat.

Detailed description of the invention

Fig. 1 is the main view of the utility model off circuit tap changing transfor mer core assemblies；

Fig. 2 is the top view of the utility model off circuit tap changing transfor mer core assemblies；

Fig. 3 is the structural schematic diagram of the utility model timber lining.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.

Please refer to Fig. 1 and Fig. 2, a kind of off circuit tap changing transfor mer core assemblies provided by the utility model, with existing skill Art is the same, including metab 1, is provided with iron core 2 on the metab 1.Iron core 2 is main magnetic circuit part in transformer Point, usually by silicon content, higher, surface is coated with the hot rolling of insulated paint or cold-reduced silicon sheet closed assembly forms.Iron core 2 and around on it Winding 3 form complete EM induction system.As shown, the iron core 2 include vertically disposed core limb 21 and across Iron yoke 22 at the top of it is set, winding 3(is arranged on the core limb 21 and only shows intermediate one group), the winding 3 is from interior It is outward low pressure winding and high-voltage winding respectively.

Unlike the prior art: folder square tube 4 and lower folder side are respectively arranged on the outside of the upper and lower ends of the winding 3 The hollow pipe of pipe 5, other certain cross sections is also possible, in view of the demand of assembly, is using cross section in the utility model Rectangular hollow pipe.The upper folder square tube 4 and lower folder square tube 5 are respectively two, i.e., are altogether 4 hollow pipes, respectively symmetrical Ground is located on the outside of the end face of the iron yoke 22 in parallel on the outside of the both ends that winding 3 is arranged in.

The axis perpendicular of the central axes and iron core 2 of the upper folder square tube 4 and lower folder square tube 5, described two upper folder square tubes 4 Folder square tube 5 is fastened each by screw rod 7 under with two, and the setting of fastening nut 8 of the screw rod 7 is in the upper folder square tube 4 under Press from both sides the inside of square tube 5.The problem of end of screw rod 7 being prevented not exposed in this way, incised wound winding occurs.

Support column 9 is vertically welded between the upper folder square tube 4 of the same side and lower folder square tube 5.The upper folder square tube 4 with By 12 transmitting forces of timber lining between the winding 3, transmitted between the lower folder square tube 5 and the winding 3 by timber lining 12 Active force, 12 structure of timber lining is identical, and as shown in connection with fig. 3, including disc-shaped body 121 and projection are enclosed in ontology end face one Protrusion 122, between described raised 122 and 121 inside of disc-shaped body be arc transition.In this way, when assembling, the upper folder Square tube 4 and lower folder square tube 5 apply opposite active force to the winding 3 by timber lining 12 always.It is special due to timber lining 12 Structure, described raised 122 can block the outside circumference of winding 3, and the arc transition structure can make winding begin after assembly An inside convergent force is born eventually, offsets the radial forces between winding in this way.

The upper folder square tube 4 is identical with 5 shapes of lower folder square tube, includes a cooling oil channel 6 in pipe.Wherein cooling oil can To use transformer oil, thus cooling effect can be generated by the specific position to winding well.

In this preferred embodiment, the support column 9 of the same side is two, is separately positioned between three-phase windings.Into one Step, in order to reach the double action of fastening and cooling, passes through screw 10 on the support column 9 of the same side and be fixed with middle position side The outer surface of the winding 3 is tightly attached in pipe 11, the side of the middle position square tube 11, includes a cooling oil channel 6 in pipe.Middle position The structure of square tube 11 is similar with the upper folder square tube 4 and lower folder square tube 5 with refrigerating function, and details are not described herein.The upper folder side Pipe 4, it is lower folder square tube 5, middle position square tube 11 periphery be coated with insulating layer, play good insulating effect.

For the utility model under the premise of ensuring that core assemblies comply with standard, the winding for solving the prior art loosens and hair The problem of heat.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting Related claim.

Claims (8)

1. a kind of off circuit tap changing transfor mer core assemblies, including metab (1), iron is provided on the metab (1) The heart (2), the iron core (2) include vertically disposed core limb (21) and across the iron yoke (22) being arranged at the top of it, the iron It is arranged with winding (3) on stem (21), is low pressure winding and high-voltage winding respectively from inside to outside, which is characterized in that the winding (3) folder square tube (4) and lower folder square tube (5), the upper folder square tube (4) and lower folder square tube are respectively arranged on the outside of upper and lower ends (5) two are respectively, in parallel across setting on the outside of the both ends of winding (3), and its central axes and the axis of iron core (2) mutually hang down Directly, under described two upper folders square tube (4) and two folder square tube (5) each by screw rod (7) fastening, the upper folder square tube (4) and Lower folder square tube (5) applies opposite active force to the winding (3) always.

2. off circuit tap changing transfor mer core assemblies according to claim 1, which is characterized in that the upper folder square tube (4) It is identical with lower folder square tube (5) shape, it include a cooling oil channel (6) in pipe.

3. off circuit tap changing transfor mer core assemblies according to claim 2, which is characterized in that the screw rod (7) it is tight Gu nut (8) setting is in the inside of upper folder square tube (4) and lower folder square tube (5).

4. off circuit tap changing transfor mer core assemblies according to claim 3, which is characterized in that the upper folder of the same side Support column (9) are vertically welded between square tube (4) and lower folder square tube (5).

5. off circuit tap changing transfor mer core assemblies according to claim 4, which is characterized in that the support of the same side Column (9) is two, is separately positioned between three-phase windings.

6. off circuit tap changing transfor mer core assemblies according to claim 5, which is characterized in that the support of the same side It is fixed with middle position square tube (11) by screw (10) on column (9), the winding (3) are tightly attached in the side of the middle position square tube (11) Outer surface, pipe in include a cooling oil channel (6).

7. off circuit tap changing transfor mer core assemblies according to claim 6, which is characterized in that the upper folder square tube (4), It is lower folder square tube (5), middle position square tube (11) periphery be coated with insulating layer.

8. off circuit tap changing transfor mer core assemblies according to any one of claims 1 to 7, which is characterized in that the upper folder By timber lining (12) transmitting forces between square tube (4) and the winding (3), the lower folder square tube (5) and the winding (3) it Between by timber lining (12) transmitting forces, timber lining (12) structure is identical, including disc-shaped body (121) and projection are at this The protrusion (122) that body end face one is enclosed, for arc transition between described protrusion (122) and disc-shaped body (121) inside.