RO111000B - Transformers insulation making process - Google Patents

Abstract

The invention relates to a process of realization of insulation of electric transformers, high voltage, dry, with alternating windings. The ae invention may apply to the electrical transformers, which have installations bt vacuum impregnation and polymerization furnaces a lake. By this method, the coil winding (1) and secondary (2) are made in insulating sheaths (9, 10, 11), of a sticky tape (9) impregnated in vacuum and polymerized, stirtle band, wound in opposite to the first layer, impregnated in vacuum and polymerized (10) and impregnated glass tape (11), the assembly in which the plates intersect insulating (5, 12, 13) placed in the device tightening (14, 15), pressed on a height, at the odds of Fimd mounting, which is impregnated in vacuum and polymerized in the furnace, where the polymerisation of the last layer (11) of the bobbin sheath, performs a block type insulation, compact, reliable and mechanical. This the process has the following advantages: insulation without air and moisture inclusions, sheath insulating is dense, compact and secure for high voltages and stable at vibrations and forces electrodynamic.

Description

The invention relates to a process for producing insulation, high voltage electrical transformers, dry, with alternating windings.

In order to achieve the insulation of high voltage transformers, dried, with alternating windings, primary and secondary coils are formed which. they are insulated by multilayer wrap in several layers. Thus isolated, the primary and secondary coils are assembled by alternating superimposition to the high voltage transformer assembly.

This process of making the insulation of the dry transformers has the disadvantage that it produces a lower quality insulation, with the inclusion of air and humidity, which is not compact and therefore not reliable.

The process of making the insulation of the high voltage electric transformers, dried, with alternating windings, according to the invention, eliminates the disadvantages mentioned above, in that the primary and secondary windings are made in insulated sheets of vacuum-impregnated and polymerized glass strip wrapped in reverse direction to the first layer, impregnated in vacuum and polymerized and impregnated glass strip, assembly in which the insulated plates are placed, placed in the clamping device, pressed up to the final mounting height, which is impregnated in vacuum and polymerized in the oven, where polymerizes the last layer of the coil sheath, a process that produces a block type, compact, electrically and mechanically reliable insulation.

The invention has the following advantages:

- provides an insulation scheme by which an insulation coil shell is made without the inclusion of air and humidity;

- the insulating shell is dense, compact and safe for high voltages and also stable at vibrations and electrodynamic forces;

- achieves total isolation of the transformer, block type, of high electrical and mechanical reliability in operation.

The following is an example of an embodiment of the invention, in connection with Figures 1 ... 3, which represents:

- fig.1, the section through the window of a dry high voltage transformer, with alternating windings;

- Fig. 2, section through the high voltage coil of the transformer;

- Fig. 3, section through the primary and secondary windings of the transformer, mounted in the clamping device.

The process for producing the transformer insulation consists of forming the windings, primary 1 and secondary 2, which are embedded in the insulating keys 3 and 4 respectively, between which the insulation is inserted 5. The assembly is placed in the window of the magnetic core of the transformer 6.

The coil is made of copper or aluminum conductor 7, enamelled with insulation and two layers of glass wire 8, tightened with a glass ribbon coil next to coil 9, and then the coil is impregnated, in vacuum, in a thermal class F lake. and polymerized at an appropriate temperature.

Further, the coil is insulated with three layers of glass tape, in the opposite direction of the first layer, it is impregnated in vacuum and polymerized again 10.

Depending on the nominal and test voltage, the winding, the coil is then wound, with several layers of resin-impregnated glass tape, with hot reinforcement (damp strips) 11; insulating layers 9, 10 and 11 constitute the insulation of the windings.

The primary and secondary windings made in the insulating fabrics overlap, intersecting the insulating plates 5, and in the upper and lower parts the insulating plates 12 and 13. the whole subassembly is fixed in the clamping device composed of two plates 14 and four screws with nuts. tightening

15.

The clamping device, in which the winding assembly is fixed, pressed up to the final mounting height, is impregnated in a vacuum, in a thermal class F lake and polymerized in the oven at an appropriate temperature. On this occasion, the last layer of the insulation of the coils is polymerized, and the impregnation of the vacuum assembly produces a compact insulation.

Claim

Claims (1)

Process for the insulation of high voltage electric transformers, dry, with alternating windings, characterized in that the primary (1) and secondary (2) windings are made of insulating sheaths (9, 10 and 11) from the glass strip (9 ) vacuum-impregnated and polymerized, the glass band, wound in the opposite direction to the first layer, vacuum-impregnated and polymerized (10) and the impregnated glass band (11), assembly in which the insulating plates (5, 12 and 13) are interleaved, placed in the clamping device (14 and 15) pressed at height to final mounting dimensions, which are vacuum impregnated and polymerized in the oven, where the last layer (11) of the coil seals is polymerized, a process that produces a compact, block type insulation , electrically and mechanically reliable.