# Calculation Method of the Number of Turns of Power Transformer Core

Regarding the calculation method of Power transformer number of turns, different types of transformers have corresponding technical requirements, which are generally expressed by corresponding technical parameters, the main technical parameters of power transformers and low-frequency transformers.

We can provide you single phase and three phase pad mounted transformer

#### Dry-type Transformer

Type：Cast resin; Rated Capacity: Up to 25MVA; Rated Voltage: Up to 36KV;

#### Pole Transformer

TypeCSP type Frequency: 50/60Hz; Rated Power: 5~167kva

#### Dry-type Transformer

Frequency: 50/60Hz Rated voltage:10kv, 20kv,30kv Rated Power: 400~2500kva

The maximum value of the main magnetic flux is due to the difference in the transformer number of turns of the secondary winding and the primary winding, and the induced potentials E1 and E2 are also different. When the internal impedance voltage drop is omitted, the voltages &Uacute;1 and &Uacute;2 are also different.

When the secondary side of the power transformer is unloaded, the primary side only flows through the current of the main magnetic flux (&Iacute; 0), this current is called the excitation current.

When the load current & Iacute; 2 is applied to the secondary side, magnetic flux is also generated in the iron core, trying to change the main magnetic flux, but when the primary voltage does not change, the main magnetic flux is unchanged, and the primary side will flow.

There are two parts of the current, one is the excitation current &Iacute;0, and the other is used to balance &Iacute;2, so this part of the current changes with &Iacute;2.

When the current is multiplied by the transformer number of turns, it is the magnetic potential.

The above-mentioned balancing function is essentially a magnetic potential balancing function, and the transformer realizes the energy transfer between the primary and secondary sides through the magnetic potential balancing function.

Transformer technical parameters have corresponding technical requirements for different types of transformers, which can be expressed by corresponding technical parameters.

For example, the main technical parameters of power transformers: rated power, rated voltage and voltage ratio, rated frequency, operating temperature level, temperature rise, voltage adjustment rate, insulation performance and moisture-proof performance.

General technical parameters of low-frequency transformers: transformation ratio, frequency characteristics, nonlinear distortion, magnetic shielding and electrostatic shielding, efficiency, etc.

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