RU27265U1 - TRANSFORMER - Google Patents

Abstract

A transformer containing an active part located in a tank filled with a liquid dielectric, characterized in that a mixture of transformer oil and liquid ester Midel 7131 is used as a liquid dielectric.

Description

ЩШ

 ° ° MPKN01F15 / 02

TRANSFORMER

The utility model relates to electrical engineering, in particular, to transformer construction, and can be used in transformers whose tanks are filled with dielectric fluid.

Known transformer containing the active part located in the tank filled with a dielectric fluid, which is a transformer oil L. 1.

The transformer described in L.1 has a limited load capacity due to the relatively low ignition temperature, as well as a relatively short time between the change of transformer oil during operation due to the rapid aging of solid insulation, which occurs due to the low moisture absorption capacity of the transformer oil without reducing its breakdown voltage.

Known transformer containing the active part, placed in a tank filled with a dielectric fluid, which is an ester or tetraester of the ethereal acid pentaoritrite Midel7131 L. 2.

The transformer described in L.2 has a high ignition temperature and does not require a change in the dielectric fluid used in it during operation due to its good moisture absorption capacity with virtually no reduction in breakdown voltage.

However, the transformer described in L.2 has two drawbacks:

- a sufficiently large cooling system due to the high viscosity and low heat transfer coefficient of the fluid Midel 7131;

- high cost due to the high price of this liquid itself and its significant consumption in the transformer compared to

a transformer containing transformer oil as a dielectric fluid.

A known mixture of transformer oil and liquid ester Midel 7131 L.Z.

However, there is no information on the use of this mixture as a dielectric fluid.

A useful model solves the problem of creating a transformer characterized by high reliability with an extended service life.

To solve the problem in a transformer containing an active part located in a tank filled with a liquid dielectric, it is proposed, according to this utility model, to use a mixture of transformer oil and liquid ester Midel 7131 as a liquid dielectric.

The utility model is illustrated by the example of the drawing, FIG. 1, which shows the inventive transformer, its longitudinal section.

The transformer contains the active part 1, located in the tank 2, filled with a liquid dielectric 3.

The use of a mixture of transformer oil and liquid ester Midel 7131 as a liquid dielectric will allow the creation of a new generation of transformers due to the fact that the specified dielectric liquid will have such characteristics as breakdown voltage, tg 6, dielectric constant, kinematic viscosity, similar in value to transformer oil .

Low kinematic viscosity provides good heat transfer and permissible overheating of live parts with a relatively small cooling system.

The addition of Midel 7131 liquid ester to transformer oil will increase the liquid's ability to absorb moisture from the solid insulation of the transformer. At the same time, solid insulation without moisture content is not destroyed, i.e. her aging slows down. This is equivalent to either increasing the service life of the transformer, or its load capacity with a constant service life.

Table 1 shows the various characteristics of transformer oil, Midel 7131 liquid ester, and a mixture consisting of these two components: transformer oil and Midel 7131 liquid ester.

№№ Hiring- The ratio of the forging of the ingredients of the oil Midel probiv-diel. tgS, beats weight, kinematic no-treading, bridge, kWe

A transformer with a liquid dielectric, which is used as a mixture of transformer oil and a complex liquid ester Midel 7131 is made and passed an experimental test. Its positive results confirmed the operability of a transformer with such

Table 1

Characteristics KG / DM viscosity tt norm

liquid dielectric, as well as the wide possibilities of its practical application in the future, References:

1.A.V. Sapozhnikov Design of transformers, M.-L., Gosenergoizdat, 1959, p. 298.

2.K. Borzi Electrical Properties of Midel 7131 Fluid as an Insulator for Distribution Transformers, paper read September 22, 94 at the third meeting on electrical insulation systems in Hamburg, Germany.

3. Determination of the electrical properties of mixtures of electrically insulating liquids, report 14 of the Schering Institute for High-Voltage Engineering and High-Voltage Equipment at the University of Hanover, October 1998, Hanover.

Claims (1)

A transformer containing an active part located in a tank filled with a liquid dielectric, characterized in that a mixture of transformer oil and liquid ester Midel 7131 is used as a liquid dielectric.