What is Over Fluxing in Transformer ?

What is Over Fluxing in Transformer ?

Over Fluxing Definition

Over fluxing in a transformer occurs when the magnetic flux density exceeds the designed limit, leading to potential damage.

Causes of Over Fluxing

Over fluxing can be caused by overvoltage, low-frequency power generation, lightly loaded transmission lines, and inadequate shunt compensation.

Effects of Over Fluxing

• Over voltage causes due to sudden load rejection

• Low frequency generation of power

• Transmission line is lightly loaded

• Proper shunt compensation in transmission system is not provided.

Over fluxing Protection

The flux in a transformer, under normal conditions is confined to the core of transformer because of its high permeability compared to the surrounding volume. When the flux density in the increases beyond saturation point, a substantial amount of flux is diverted to steel structural parts and into the air. At saturation flux density the core steel will over heat.

Protection Mechanisms

A typical protection scheme uses a combination of voltage transformers, resistors, capacitors, and Zener diodes to monitor and respond to over fluxing conditions.