Please can anyone tell me what exactly is meant by reflecting of impedance in a transformer?
I do not know much about transformers, but I want to know about its uses and phenomena behind it.
I will be using a current transformer in my project to find out the impedance reflection. I do know the formula to find out how much impedance is being reflected, but do not understand the theoretical concept involved in it.
Its the 'equivalent load' you would have to connect across the primary voltage in order to produce the same value of current that would flow in the primary of a transformer due to a load connected to the secondary.
The basic theoretical concepts are:
(1) Transformer turns ratios (2) Power conservation (power out = power in) (3) Ohm's law
An example:
Suppose you had a 10:1 turns reduction transformer and put 100V on the primary. The output voltage would be 1/10 of 100 i.e. 10 V. If you were to connect a 10 ohm load across the secondary this would produce a secondary current of 1 Amp. (Ohm's law). Assuming the transformer is 100% efficient then the power out must equal the power in. This means the primary current will be 1/10th the secondary current or 0.1 amps. So at the primary side we have 100V and a current of 0.1 amps.
If the transformer circuit was replaced by a single equivalent load then by Ohm's law this would be equal to 100V / 0.1A = 1000 ohms. This is the reflected impedance of the 10 ohm load on the secondary.
