CN102368432A

CN102368432A - Semi-circular outer iron core epoxy cast voltage transformator with power supply winding

Info

Publication number: CN102368432A
Application number: CN2011100543146A
Authority: CN
Inventors: 牛传裕; 蔡强; 杨峰
Original assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Current assignee: JIANGSU KEXING ELECTRICAL APPLIANCES CO Ltd
Priority date: 2011-03-08
Filing date: 2011-03-08
Publication date: 2012-03-07

Abstract

The invention relates to a semi-circular outer iron core epoxy cast voltage transformator with a power supply winding, comprising an iron core and a coil winding cast body; the iron core consists of four C-shaped iron cores; any two of the four C-shaped iron cores are butted to form two stud shapes which are parallelly cast onto the coil winding cast body; the excircles of the four C-shaped iron cores are tightly hooped by a steel band and firmly fasten the four C-shaped iron cores onto the coil winding cast body; the cross section of each C-shaped iron core is a semi-circle with the opening being outwards, so that the contacted surfaces of the adjacent two C-shaped iron cores are coincident and the cross sections of the adjacent two C-shaped iron cores are in circular shapes. The semi-circular outer iron core epoxy cast voltage transformator with the power supply winding quickly radiates heat through the outer iron core, has high radiating efficiency, reduces the lead cross section of primary and power windings, improves the current density, reduces the used amount of copper and the size of the transformator, greatly reduces the cost, effectively solves the problem of local discharge, and ensures the reliability and the service life of the product.

Description

Semicircle outer iron core formula epoxy casting voltage transformer with power supply winding

Technical field

The present invention relates to a kind of epoxy casting transformer, particularly relate to a kind of semicircle outer iron core formula epoxy casting voltage transformer of the 220V of having power supply winding.

Technical background

Owing in high-tension switch cabinet, need the switching manipulation power supply of 220V, mostly being employed in during switch designs increases 220V voltage winding and is used as operating power in the epoxy casting voltage transformer.Existing voltage transformer mostly adopts the totally-enclosed moulding by casting of epoxy resin, and iron core all waters with coil is in the same place, and along with the increase of its power supply capacity, the heat dissipation problem of epoxy casting voltage transformer more and more is difficult to solve.Amplify and have only the cross section of strengthening winding conducting wire and the surface radiating face of pour mass; And for guaranteeing the precision of instrument transformer secondary; The power supply winding will be placed on the position near iron core during the instrument transformer design, and this has more increased the difficulty of heat radiation, if increase the volume and the surface area of casting transformer; Will inevitably bring small product size to increase and the cost increase, receive the position limitation of switch cubicle.Other has the JDZ type that adopts outer iron core only to water the voltage transformer of coil, and its iron core adopts stacked rectangular configuration, and the iron core exposed portions serve plays thermolysis, but core section has wedge angle to make the partial discharge quantity severe overweight, so the penetration and promotion of failing.

Summary of the invention

In order to solve the integrated poured heat radiation difficulty of voltage transformer in the prior art; And the voltage transformer iron core partial discharge of only watering coil seriously waits not enough; The purpose of this invention is to provide a kind of simple in structure, good heat dissipation effect, cost of manufacture low, take up room little; Can effectively prevent partial discharge, safe and reliable semicircle outer iron core formula epoxy casting voltage transformer with electric winding.

The technical scheme that the present invention adopts is: a kind of semicircle outer iron core formula epoxy casting voltage transformer with power supply winding; Comprise iron core, winding, secondary winding and a power supply winding; Once, secondary winding and power supply winding pour into the coil windings pour mass through the epoxy resin one; Its technical characterstic is that said iron core is made up of four C sections cores; The cross section of four C sections cores all is and the opposing outer opening of C sections core C type opening direction; The C type opening of the one C sections core docks with the C type opening of the 2nd C sections core each other, the outer opening of the 2nd C sections core docks with the outer opening of the 3rd C sections core each other, the C type opening of the 3rd C sections core docks formation " day " font each other with the C shape opening of the 4th C sections core and is set in side by side on the coil windings pour mass, and the outer ring of four C sections cores is anchored on four C sections cores on the coil windings pour mass by a steel band banding.

Further, the cross section of said every C sections core is semicircle opening outwardly, and the contact-making surface of second and third C sections core overlaps and the semicircle opening of second and third C sections core synthesizes circle, and the power supply winding of coil windings pour mass passes above-mentioned circular cross-section.

Again further, be cast with the ground connection copper sheet that connects iron core on the said coil windings pour mass.

Adopt above technical scheme, the beneficial effect that the present invention reaches is:

1, iron core is sleeved on the coil windings pour mass being connected into " day " font by four C sections cores successively side by side; All coil windings are watered with epoxy resin and are integral; The cross section of every C sections core is and the opposing opening semicircle outwardly of C sections core C type opening, and the arc end of the semicircle opening in iron core C sections core cross section is near coil windings pour mass surface, and bigger heat-dissipating space and the area of generation between the pour mass surface; There is not outstanding tip, effectively reduces discharge; The coil windings pour mass all scribbles semiconductor varnish or plating layer of metal film at the position near iron core; And be provided with the ground connection copper sheet that connects iron core; Can play the air gap between shielded coil winding pour mass and iron core well; The elimination air outside is discharged, and efficiently solves the partial discharge problem of product, has ensured reliability of products and useful life;

2, the rectilinear end of the semicircle opening in iron core C sections core cross section has improved the Electric Field Distribution of air gap between iron core and the pour mass surface from the pour mass surface farthest effectively; The iron core semi-circular cross-section near pour mass power supply winding by being enclosed within on the winding pour mass is taken heat out of in a large number; The iron core surface that is set in the pour mass outside all is exposed, and the effective quick heat radiating of part through iron core is exposed has increased area of dissipation; Radiating efficiency is high; Reduce the conductor cross-section of interior winding of coil windings pour mass and power supply winding, improved current density, reduced the volume of making copper consumption and instrument transformer; Reduce cost significantly, solved the limitation problem that the switch cubicle requirement has power supply winding casting type voltage transformer.

Voltage transformer of the present invention is set in side by side on the coil windings pour mass of one cast and forms being connected into " day " font successively by four C sections cores; It is simple in structure, and it is little to take up room, easy to process; Cost is low; Good heat dissipation effect, instrument transformer do not have the partial discharge problem, and be safe in utilization, reliable, the life-span is long.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the vertical view of Fig. 1.

Among the figure:

C sections core

1,2,3,4, coil windings pour mass 5, ground connection copper sheet 6 is installed floor 7, steel band 8, semicircle opening 9, C type opening 10.

Embodiment

Below in conjunction with accompanying drawing the present invention is described further.

Fig. 1, shown in 2, a kind of semicircle outer iron core formula epoxy casting voltage transformer with power supply winding comprises four

C sections cores

1,2,3,4, coil windings pour mass 5, ground connection copper sheet 6, floor 7 and steel band 8 is installed.Coil windings pour mass 5 by epoxy resin will be once, secondary winding and the winding integrated cast of power supply form; The cross section of four C sections cores all is and the opposing semicircle opening 9 of C sections core C type opening 10 directions; The C type opening of the one C sections core 1 docks with the C type opening of the 2nd C sections core 2 each other, the outer opening of the 2nd C sections core 2 docks with the outer opening of the 3rd C sections core 3 each other, the C type opening of the 3rd C sections core 3 docks formation " day " font each other with the C shape opening of the 4th C sections core 4 and is set in side by side on the coil windings pour mass; The butt joint contact-making surface of second and third

C sections core

2,3 overlaps and the semicircle opening 9 of second and third

C sections core

2,3 synthesizes circular; The power supply winding of coil windings pour mass 5 passes above-mentioned circular cross-section; The outer ring of four C sections cores is fastened at four C sections cores on the coil windings pour mass by steel band 8 bandings, and four C sections cores are exposed fully outside, help heat radiation; And the semicircle end in C sections core cross section contacts with the coil windings pour mass; Increase heat-dissipating space, improved the Electric Field Distribution of the air gap between iron core and pour mass surface, and efficiently solved the traditional product problem of seriously discharging; Be cast with the ground connection copper sheet 6 on connection floor 7 on the coil windings pour mass, ground connection copper sheet 6 is pressed together between steel band 8 and four C sections cores.Steel band well contacts with four C sections cores, and through ground connection copper sheet ground connection, the coil windings pour mass is fixed on the floor, connects good relevant earth connection and gets final product.

Claims

One kind have the power supply winding semicircle outer iron core formula epoxy casting voltage transformer; Comprise iron core, winding, secondary winding and a power supply winding; Once, secondary winding and power supply winding pour into coil windings pour mass (5) through the epoxy resin one; It is characterized in that: said iron core is by four C sections cores (1; 2; 3,4) form, the cross section of four C sections cores all is and the opposing outer opening of C sections core C type opening (10) direction; The C type opening of the one C sections core docks with the C type opening of the 2nd C sections core each other, the outer opening of the 2nd C sections core docks with the outer opening of the 3rd C sections core each other, the C type opening of the 3rd C sections core docks formation " day " font each other with the C shape opening of the 4th C sections core and is set in side by side on the coil windings pour mass, and the outer ring of four C sections cores is anchored on four C sections cores on the coil windings pour mass (5) by a steel band (9) banding.
2. the semicircle outer iron core formula epoxy casting voltage transformer with power supply winding according to claim 1; It is characterized in that: the cross section of said every C sections core is semicircle opening (9) outwardly; The contact-making surface of second and third C sections core overlaps and the semicircle opening of second and third C sections core synthesizes circle, and the power supply winding of coil windings pour mass (5) passes above-mentioned circular cross-section.
3. the semicircle outer iron core formula epoxy casting voltage transformer with power supply winding according to claim 1 is characterized in that: be cast with the ground connection copper sheet (6) that connects iron core on the said coil windings pour mass (5).