Transformers - Part One


Transformer:

transformer Is a device that converts the same amount of energy (KVA) from network voltage to the proper user voltage by using magnetic field generated from alternating current passage in the primary coil to generate an alternating current passing in the secondary coil. So, the voltage and current Values before and after conversion will be different but with a same amount of energy (KVA) and same frequency (HZ).

I.e. the transformer converts the alternating current with low Voltage to the alternating current with a high voltage (called in this case, step-up transformer) or converts the alternating current with high Voltage to the alternating current with a low voltage (called in this case, step-down transformer).

Transformer purposes

transformer purpose is making suitability between the user voltage and the voltage of his network feeding point by either step-up or step-down the voltage level.

The other purpose of transformers is transmitting energy to long-distance with high Voltages which gave the electrical networks designers some additional benefits such as:

  1. Transformers permit power transmission on high voltage levels resulting in availability of using small sections of feeders and transmission lines.

  1. Transmitting power with high voltage levels will reduce the current values passing through feeders and transmission lines and hence the power loss will be reduced also.

  1. Reducing the power losses in power transmission process will reduce the economic cost of transmission lines setup.

Transformer operation idea:


Transformer operation idea is using magnetic field generated from alternating current passage in the primary coil to generate an alternating current passing in the secondary coil. And due to using different turns ratio between primary and secondary coils with fixation of transferred energy value, the voltage level of secondary coil will be different from that of primary.

The voltage and current Values before and after conversion will be different but with a same amount of energy (KVA) and same frequency (HZ).

And by changing this turns ratio values we can increase or decrease the secondary coil voltage value keeping constant amount of transferred energy, noting that the relationship between the value of current and voltage is an inverse relationship at constant amount of transferred energy.



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