SU193607A1 - - Google Patents

Description

Explosion-proof transformers with quartz filling, for example in three-phase versions, are known. They contain magnetic cores, alternating disk windings, the insulation of the coils is made in the form of washers and cylinders of insulating material, and a cooling system consisting of each heat-conducting metal the cuts, which are located between the individual winding discs and its internal part, are in direct contact with the insulation washers of the coils, and the outer d into the corrugations of the casing.

In these transformers, the insulation layer between the windings and the heat-conducting plates has a considerable thickness, which leads to an increase in thermal resistance, a temperature drop in the insulation, an increase in the temperature of the windings, and an increase in the specific consumption of active materials.

In the described transformer, in order to lengthen the current leakage path along the insulating surfaces from the elements under voltage, improve heat removal and eliminate the possibility of short-circuited coils, the insulation of individual coils of windings is made of two glass fiber material washers and each heat conductor The plate of a part of cores, for example, two adjacent phases, consists of two halves.

In order to securely fix the insulating washers, the cylindrical part of one of them has a larger diameter, is provided with a collar, and covers the outside of the cylindrical part of another washer, the edges of which abut against the collar. Washers can also be insulated with an insulating ring enclosed outside

washers and abutting their shoulders.

In order to create structural rigidity, for example, when making a transformer with a horizontal arrangement of the cores of the magnetic core, heat-removing plates of one

from the phases below, there are cuts on the inside.

The proposed transformer is shown in FIG. 1. In FIG. 2 yes "cut along the LA. An explosion-proof transformer with a quartz filling is supplied separately or completed with high and low voltage switchgear in an explosion-proof design, located on a common chassis with a transformer.

All the insulating gaps of the transformer between the casing and the active part are filled with pure quartz sand with a silica content of at least 98.7%. Intrinsic safety is provided by a protective layer

Who closes excludes the emission of hot particles into the atmosphere of fired gas.

Rods / magnetic conductors are arranged horizontally, the windings are high volt 2 and low voltage 3 are made alternating from disk coils. Between the Katushkami there are metal heat plates 4 that discharge heat, co-activating with the corrugated surface of the casing 5.

The essential difference of the present transformer from the existing ones abroad is the construction of the insulation and the cooling system. The insulation is made of pressed glass fiber or other materials of high thermal conductivity and heat resistance. The use of such insulation in combination with quartz filling will allow the creation of dry transformers without silicone insulation. The isolation of an individual coil is made in the form of a “lock” of two insulating washers 6, the high-voltage winding washers have flanging 7, or two washers and a ring covered by washers and abutting their shoulders.

The heat-conducting plates 4 located on the lower phase must be rigid, as they are guides when installing the active part. Therefore, they are made intact with an internal incision 8.

Pa of the other two phases are separate cooling plates that are not directly connected to each other.

In order to stiffen all heat-removing plates, metal jumpers 9 are used, which simultaneously serve as the grounding of the cooling plates, except for the fact that during insulation breakdown, high voltage is applied to the low-voltage winding. Such a design allows the extension of current leakage and insulating surfaces from elements under pressure (coils of windings) to grounded parts (heat-removing plates, magnetic conductor) while simultaneously increasing the surfaces of contact of the coils of windings with a lead and plates and an approximation heat sink plates In addition, decreases

insulation thickness between winding coils and thermal strips (up to 3 mm).

Subject invention

Claims (4)

1 .. Explosion-proof transformer with quartz filling, naiimer, in three-phase isiolenia, containing a magnetic core, alternating disk windings, insulation of coils which are made in the form of washers and cylinders, for example, of fiberglass materials, and a cooling system, consisting of covering each rod - heat exchanger metal tap plates with cuts that are located between the individual winding disks and its internal part are in direct contact with the insulating washers of the coils, and the external part enters the corrugations of the casing, characterized in that in order to extend the current leakage path along the insulating surfaces from the elements, under stress, improving heat dissipation and eliminating the possibility of short-circuit turns, The isolation of the individual winding coils is made of two washers and each heat-removing plate of a part of the cores, above two adjacent phases, consists of two halves. 2. The transformer according to claim 1, characterized in that, in order to hopefully fix the insulating washers, the cylindrical part of one of them has a larger diameter, is equipped with a collar and covers the outside of the cylindrical part of another washer, the edge of which unites into the specified one. 3. Transformer of claim 1, characterized in that the fixing of the insulating washers of the coils is carried out by means of an insulating ring, which is gripped outside by the washers and abutting against their shoulders. 4. Transformer on PP. 1-3, characterized in that, in order to create rigidity of the structure, for example, when making a transformer with a horizontal arrangement of magnetic core rods, the heat removal plates of one of the phases below are cut from the inside.