JPH0354452B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention includes a sheet-like winding, and provides a method for tightening the sheet-like winding, reinforcement of short-circuit mechanical force, reinforcement of vibration during transportation, and winding support technology. This invention relates to an improved foil-wound transformer.

[Technical background of the invention and its problems]

Sheet-shaped windings, which have traditionally been used in foil-wound transformers, have been widely used due to their excellent winding space factor, good potential distribution, and simple manufacturing. It was limited to relatively small capacity transformers. Therefore, little consideration was given to short-circuit mechanical force and vibration during transportation, and winding tightening and support were not required.

However, due to recent demands, sheet windings have been made to have higher voltages and larger capacities, and the number of winding turns has increased, the shape and dimensions have increased, and this has led to stronger short-circuit mechanical strength, stronger resistance to vibration during transportation, and even stronger resistance to the winding itself. It became necessary to improve the supporting structure. In this situation, tightening with tape or the like from the outside of the winding, which has been used in conventional low-voltage, small-capacity transformers, can reduce the strength of short-circuits and vibrations during transportation because the sheet-like winding is thin. I've become unable to bear it anymore.

Furthermore, in the so-called separate type transformer, which separates insulation and cooling, which has been recently considered, in addition to the loosening of the winding by inserting a cooling duct into the winding, and the fixing technology of the cooling duct,
Improvements in the above-mentioned support structure, short-circuit mechanical force reinforcement technology, and vibration reinforcement during transportation have been required.

In conventional separate transformers, the high-voltage windings are only tightened from the outside with glass fiber-filled tape, etc., and with this configuration, it is not possible to prevent changes in shape and dimension due to loosening of the windings, and it is difficult to prevent mechanical forces from occurring in the event of a short circuit. The strength was insufficient, and supporting from above and below was impossible because the sheet insulator protruded beyond the sheet conductor, so some kind of support had to be considered.

[Purpose of the invention]

The present invention has been made in view of the various drawbacks of the above-mentioned prior art, and has the aim of strengthening short-circuit mechanical force of sheet-like windings and vibration during transportation, strengthening tightening against loosening of windings, etc., and providing stable The aim is to obtain a highly reliable foil-wound transformer equipped with a winding support structure.

[Summary of the invention]

In order to achieve the above object, the present invention provides a cylinder divided into two on the outside of the high voltage shield provided at the end of the high voltage winding, connects this cylinder with a stud via a spring, and further insulates the end of the high voltage shield. This is characterized in that the sheet-like winding is fixed to the tank via an object to protect the sheet-like winding from short-circuit mechanical force, vibration during transportation, etc.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Here, in order to make the configuration of the present invention easiest to understand, a case will be shown in which the present invention is applied to a so-called separate type transformer, but the present invention can be applied in the same manner to a normal foil-wound transformer other than a separate type.

In FIGS. 1 and 2, 1 is an iron core, and around this iron core 1 is a low-voltage winding 4 consisting of a foil-wound winding in which a metal sheet 2 and an insulating sheet 3 are overlapped and wound.
and a high voltage winding 5 are wound. A cooling duct 6 is interposed between the windings 4 and 5 at appropriate locations, and a cooling system consisting of a pump 7, a condenser 8, a water cooling pipe 9, a refrigerant tank 14, etc. provided outside the tank 12 includes a liquid collecting pipe 10, an insulated They are connected via a pipe 11.
An insulating medium 13 such as SF ₆ gas is sealed in the tank 12 to insulate the inside, and a refrigerant 15 is circulated in the cooling system. Further, a high voltage shield 16 is provided on the outside of the high voltage winding 5, and a cylinder 18 divided into two is provided on the outside of the high voltage shield 16. connected. Further, the upper and lower ends of the high voltage shield are fixed to the tank 12 via pleated insulators 19.

In the present invention constructed as shown in FIGS. 1 and 2, if the tube 18 is tightened with the stud 20 and a tightening force is applied in advance to the windings 4 and 5 from the outside in the radial direction, the windings 4 and 5 , 5 can receive the short-circuit mechanical force that acts as a tensile force on the outside, and can withstand the compressive force that acts in the axial direction of the winding and vertical and horizontal vibrations during transportation, as well as the radial tightening force and the The corrugated insulator 19 provides more resistance. Furthermore, the spring 21 follows and prevents loosening and misalignment of the windings 4 and 5 due to aging, etc., thereby providing a stable support structure.
Furthermore, creeping damage can be prevented by forming the insulator 19 fixed to the tank 12 into a pleated shape.

〔Effect of the invention〕

As explained above, by applying the present invention, short-circuit mechanical force of the sheet-shaped winding wire and vibration during transportation can be strengthened, loosening and displacement of the winding wire can be prevented, and a stable winding support structure can be achieved. A highly reliable foil-wound transformer can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a front view showing one embodiment of the present invention;
The figure is a plan view of the same. 1... Iron core, 2... Metal sheet, 3... Insulating sheet, 4... Low voltage winding, 5... High voltage winding, 6...
Cooling duct, 7...Pump, 8...Condenser, 9...
... Water cooling pipe, 10 ... Liquid collection pipe, 11 ... Insulation pipe, 12 ... Tank, 13 ... Insulation medium, 14
... Refrigerant tank, 15 ... Refrigerant, 16 ... High pressure shield, 17 ... Tape, 18 ... Tube, 19 ...
Insulator, 20... Stud, 21... Spring, 22
...Natsuto.

Claims (1)

[Claims] 1 Forming low-voltage and high-voltage windings by overlapping and winding sheet-shaped conductors and sheet-shaped insulators around an iron core,
In a foil-wound transformer, a cooling duct along the winding axis is interposed in the winding, a high-voltage shield is formed at the end of the winding, and the low-voltage and high-voltage windings are housed in a tank filled with an insulating medium. , a cylinder divided into two is provided on the outside of the high-pressure shield, and the cylinder is connected by a stud to apply a radial tightening force to the winding,
Furthermore, the foil-wound transformer is characterized in that the upper and lower ends or the lower end of the high-voltage shield are fixed to the tank via an insulator.