Fergana 2023 topik: Three-phase transformers. Measuring transformers

FERGANA POLITECHNIC INSTITUTE FACULTY OF MECHANICAL ENGINEERING DEPARTMENT OF TECHNOLOGICAL MASHINES AND EQUIPMENT GROUP E18-21 STUDENT TULASHEV OTABEK PROJECT PRESENTATION

Fergana 2023

TOPIK: Three-phase transformers. Measuring transformers.

A three-phase transformer has three cores, threetwo coils of one phase in each of the core stageis located. These three cores form a single electromagnetic circuitis enough. Primary and secondary symbols are asterisks orconnected in triangular ways. My secondary chulgamthe connection method depends on the nominal voltage of the consumeris determined. In Figure 6.4, the primary and secondary coils widely used in power transformers are star-shaped.A three-phase transformer connected in the method is shown. Thisis a step-down transformer, and the primary 10 kV line is connected to the high-voltage network.The secondary circuit is connected to a low-voltage network.

Figure 6.4.

The neutral wire of the low-voltage circuit is removed. So, a low voltage circuit has phase and line voltages. In the picture above with the letters X, Y, Ztension coils, respectively, terminations as welldefined.

In addition to the ammeter, a wattmeter or electricity meter is also connected to the secondary winding of the current transformer.

In addition to the ammeter, a wattmeter or electricity meter is also connected to the secondary winding of the current transformer.

The second type oMchash voltage transformerstransformer, the transformation coefficient of the connection is constant:

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To the secondary circuit of voltage transformersof an electricity meter other than a voltmeterthe power supply is also connected. Figure 6.5 shows the connection diagram of this transformer. My primary browserIt is connected in parallel with the consumer and has a high voltagethe voltage of the network is determined by the following formula:

To the secondary circuit of voltage transformersof an electricity meter other than a voltmeterthe power supply is also connected. Figure 6.5 shows the connection diagram of this transformer. My primary browserIt is connected in parallel with the consumer and has a high voltagethe voltage of the network is determined by the following formula:

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Autotransformers are also often used.In transformers, there is an electrical connection between the primary and secondary windings, and the secondary winding is the primary winding.is a part of my chulgam. Transformation coefficienthere it is defined as before from the following expression:

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In addition, connection of transformer coilsmethod (star or delta), nominal current andvoltage, nominal power supply of transformersmust.

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Useful work coefficient (UWC) of the transformer:

where is the power at the poles of the transformer network, ispower at the consumer poles,is the current of the consumerpower, — nominal power of the transformer, —load factor. One of the main indicators of this transformer is in the normal (nominal) mode =0,7 0,85 equals. The load coefficient of two transformers in an electric substation can be increased to 1,2-1,4. The maximum WFC of the transformer is q= 0,95 = 0,97.

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References:

• M.Turdiyev “Elektrotexnika va elektronika asoslari”
• Wikipediya