Fergana Polytechnic Institute Faculty of Chemical Technology Elt 64-21-group student Of Suyunov Nursulton From Electrical engineering Independent work

Fergana Polytechnic Institute Faculty of Chemical Technology Elt 64-21-group student Of Suyunov Nursulton From Electrical engineering Independent work

Single-phase and three-phase transformers

• Tasks and fields of application of transformers.
• Structure and principle of operation of single-phase transformers.
• Operating modes of transformers.
• Schemes of switching transformers and vector diagrams.
• Power loss in transformers and passport information.

Tasks and fields of application of transformers.

Alternating current voltage without changing its frequency increasing static electromagnetic apparatus, or increasing the amount of voltage or Electroinduction static device that reduces is called a transformer. Electric energy is transmitted from power plant generators to consumers; consumers are often located far from the station.

In order to reduce energy waste and reduce the weight of wires the amount of voltage in the generators is several tens or hundreds of times larger it will be necessary to raise it to the current transmission voltage. Transformers are used for many purposes.

Structure and principle of operation of transformers.

The conduit to which the electric energy enters from the source is called the primary conduit, and the other conduit to which the energy consumer is connected is called the secondary conduit. A current I1 and a magnetic flux F closing through the steel core are generated from the variable voltage U1 supplied to the primary coil. According to the law of electromagnetic induction, under the influence of a changing magnetic current F, self-induction EYUK i E1 is created in the primary circuit, and mutual induction EYUK i E2 is created in the secondary circuit. If a load is connected to the secondary circuit, a load current I2 will be generated and the secondary voltage will decrease U2. The ratio of the value of EYUK in the high-voltage circuit to that in the low-voltage circuit is called the transformation coefficient of transformers and is denoted by K.

Operating modes of transformers.

• 1. Normal operation mode. Nominal to the primary winding of the transformer The mode in which the voltage is applied and the secondary circuit is not loaded is its salt is called a mode of operation.
• 2. Short circuit mode. Operating at rated load if the secondary winding of the transformer is accidentally short-circuited, then this mode is called short circuit mode. In that case, don't worry 10-20 times larger current can pass.

• If salt is added to the secondary winding of the transformer in working mode, Zn when the load is connected, the load current I2 is generated. This is my primary concern material, due to the fact that the drop in the chain is small will be This operating mode has a bootable operating mode.
• Secondary parameters equivalent to the transformer to the primary possible with So it is equivalent to a transformer is called the equivalent performance of the power generator transformer. By equivalent based on the analysis of electromagnetic processes in it and the transformer greatly reduces the connected electrical power.

External characteristics of the transformer.