SWITCHING TRANSIENTS IN TRANSFORMER

Switching Transients:

The word Transients is always very Scary for me but not any more hahaaa...........what about you????

Well coming to the point...why do these Switching Transients occur in a Transformer.

• When the switch is closed when the voltage is maximum...then the flux required by the core is zero and the available flux in the core is also zero and hence NORMAL OPERATION is sufficient
• When the switch is closed when the voltage is crossing zero...then the flux required by the core is maximum but here the avaliable flux in the core is zero and hence TRANSIENT OPERATION is required

Here when the Transient operation takes place then the flux doubles gradually and this is known as Doubling Effect of Transformer.This Doubling Effect causes magnetic in rush current and Damage in the insulation.

Using Secondary Harmonic Restraining Coil can reduce all these Drawbacks.