SU1709405A1 - Active part of split-winding house transformer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in high-power power transformers with split windings of their own needs. The purpose of the invention is to reduce material consumption and reduce losses. The winding of its own needs (CH) consists of two halves, located at the upper and lower ends of the windings of low 3 and high 4 voltage. Each half of the CH winding consists of four parts ^ Parts 5 and 6 are located at the upper end of winding 3, and parts 9 and 10 - at the bottom; parts 7 and 8 are located at the upper end of the winding 4, and parts 11 and 12 - at the bottom. Parts 5 and 7, 6 and 8, 9 and 12, 10 and 12 are interconnected in series, and the successively connected pairs of parts at each end of the soy are in parallel with each other, which allows to achieve the required value of reactance, reduce losses and material consumption and increase the electrodynamic resistance. 1 hp f-ly, 2 ill.

Description

The invention relates to electrical engineering and can be used in high-power power transformers with split windings of their own needs.

The aim of the invention is to reduce material consumption and reduce losses during the transformation of electricity.

FIG. 1 shows the active part of the transformer, a section along one of the phases; in fig. 2 is a diagram of the connection of transformer windings.

The active part of a transformer with a split winding of its own needs (Fig. 1) contains a magnetic core 1, on the rod 2 of which the low voltage winding (HH) 3 is concentrically placed, the high voltage winding (HV) 4 and the split winding of its own needs (HF).

Winding CH consists of eight equal parts 5-12. divided into two sections, one of which has a width of HH winding and is located at both its ends in two parts (5, 6 and 9. 10) on each side, and the other width of the winding is HH and is also located at both its ends in two parts (7, 8 and 11, 12) on each side.

The windings are insulated from one another and from the magnetic system by means of insulating cylinders 13 and washers 14, and in the axial direction they are pressed in using pressure rings 15.

The equality of the width of the sections of the split winding CH to the corresponding widths of the windings of low 3 and high 4 voltages is necessary, dimodl ensuring reliable axial pressing of the sections of the split winding.

All parts of the split winding CH have the same number of turns. On the parts of the winding CH 7. 8.11 and 12, located along the ends of the HV winding, taps are provided to ensure the regulation of the voltage at consumers.

The split SI winding can be connected in a triangle or a star and used to power its own needs of high-power thermal stations.

The power of the winding HF can reach 10-20% of the power of the main windings HH or IT.

In order to provide the reactance of the pair, the split winding of the SI winding is in the range of 9-15%, reduced to the side of the CH, i.e. providing customer-acceptable voltage fluctuations when changing1 {the load on the winding CH. and ensuring the electrodynamic stability of the windings in case of short-circuit, the parts of the winding CH are connected as follows; Parts 5 and 7.6 and 8 of the one end of the HV and HH windings and Parts 9 and 12, 10 and 11 at the other end of these windings are connected in series, and branches 5, 7 and 6, 8 and 9, 12 and 10, 11 are connected in parallel , forming the upper and lower halves of the winding SI, respectively.

Placing the SN winding along the common ends of the low voltage winding and high voltage winding reduces the reactance of the low winding winding winding low voltage winding, eliminates asymmetry in the distribution of axial electrodynamic forces and increases the durability of the transformer at short circuit.

If there is an adjusting winding 16 on the side of the HV winding located outside the HH (fig. 1. dotted line) in the active part of the transformer, placing the CH winding along the ends of the LV and HV windings is the most acceptable option.

With this arrangement of the parts of the CH winding, the electromagnetic coupling between it and the LV winding is significantly weakened, which makes it possible to reduce the ratio of short circuit current in the winding of the SN and with less costs of the winding wire to ensure

electrodynamic resistance of the winding CH.

The use of the invention in high-power power block transformers with a capacity of 100,000-500,000 kVA makes it possible to refuse the power supply circuit consisting of a block transformer and an auxiliary transformer, usually connected to the HV side, and a switchgear.

Ph o m u l a i 3 o b e te n i 1. The active part of a transformer with a split winding of its own

needs, containing a magnetic core, on each rod of which the main low and high voltage windings are concentrically located, and the own needs winding is split, located at the low voltage and high voltage ends and divided into two sections, one of which has a low voltage winding marriages, and a friend — the width of a high-voltage winding

so that, in order to reduce material consumption and reduce losses, the sections are made with the same number of turns, each section has four equal parts, two of which are located at the bottom, and

two - at the upper end of the corresponding main winding, parts of the sections located closer to the ends of the low voltage winding are connected in series with the parts of the sections located further

from the respective ends of the high voltage winding, and parts of the sections located closer to the ends of the high voltage winding are connected in series with the parts of the sections located further

from the respective ends of the low voltage winding, pairs of series-connected parts are interconnected in parallel, forming the upper and lower halves of the medium voltage winding.

2. The active part of the transformer according to claim 1, characterized in that the parts of the split sections of the auxiliary winding, located at the ends of the high-voltage winding, are equipped with adjusting taps.

Claims (2)

Claim 1. The active part of the transformer with a split auxiliary winding, containing a magnetic circuit, on each core of which the main low and high voltage windings are concentrically placed, as well as a split auxiliary winding located at the ends of the low voltage and high voltage and divided into two sections, one of which has a width of a low voltage winding, and the other has a width of a high voltage winding, characterized in that, in order to reduce material consumption and reduce losses, the sections are made with by the same number of turns, each section has four equal parts, two of which are located at the lower and two at the upper end of the corresponding main winding, part of the sections located closer to the ends of the low voltage winding are connected in series with the parts of the sections located further from the respective ends high voltage windings, and the parts of the sections located closer to the ends of the high voltage winding are connected in series with the parts of the sections located further from the respective ends of the low voltage winding tension, pairs of series-connected parts are interconnected in parallel, forming the upper and lower halves of the medium voltage winding. 2. The active part of the transformer according to claim 1, characterized in that the parts of the sections of the split auxiliary winding, located at the ends of the high voltage winding, are equipped with adjusting tapes. w AW 4 / W \ \ W ”Ak —— 'W— FIG. / Fie. 2