Remanent Flux
When a transformer is de-energized, the core retains some residual magnetism, known as remanent flux.
This residual flux might have a substantial impact on the transformer’s performance during re-energization.
Here’s how it impacts the process:
Effects of Remanent Flux
When a transformer is re-energized, if the voltage waveform matches the polarity and level of the remanent flux, a high inrush current may develop.
This inrush current can be several times more than the transformer’s rated current, resulting in
- Mechanical stress,
- Insulation damage, &
- Improper operation of protection systems.
When re-energizing a core with a large remanent flux, it can quickly reach saturation.
Saturation lowers the core’s inductive characteristics, resulting in larger magnetizing currents.
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