Excess power results in which condition with a possible overvoltage?

The correct choice indicates that excess power results in a condition of over frequency. When there is more power generated than what is required by the load, the system frequency tends to increase. This occurs because the generators continue to produce electrical energy that is not being consumed, leading to an excess in generation compared to demand.

As the frequency rises above the nominal value, it can create instability in the system. Over frequency conditions can trigger protective relays and other safety mechanisms designed to prevent equipment damage or failure. This is critical for maintaining system reliability and preventing potential overvoltage situations, which can also endanger equipment and infrastructure.

Understanding how excess power affects frequency is vital for engineers in power engineering, as it allows for better management of generation and load balancing, ensuring that the power system operates efficiently and safely.