In a lightly loaded secondary side of a transformer bank, what is more likely to occur under ferro-resonance conditions?

Ferro-resonance is a phenomenon that can occur in electrical systems, particularly with transformers, when there is a combination of inductance and capacitance that creates a resonance condition. In lightly loaded secondary sides of transformer banks, the lower load can lead to the presence of higher voltages due to the energy oscillating between the inductive and capacitive components. This condition can lead to ferro-resonance, which is characterized by the voltage magnification that may cause the voltages to rise significantly above their normal operating levels.

The occurrence of ferro-resonance can result in unexpected and potentially destabilizing effects on the electrical network, leading to voltage spikes and possible damage to equipment. This is a known risk in systems where there's insufficient load, as it allows the inductive and capacitive elements to interact more freely and resonate, causing the manifestation of this phenomenon.

Understanding the implications of ferro-resonance is crucial for the safe operation of transformers, especially when designing systems that could be lightly loaded or in conditions that may enable such resonance. Recognizing ferro-resonance as a possibility highlights the importance of proper system design and operational awareness to mitigate risks associated with this phenomenon.