Generator over voltage may occur during what specific event?

Generator overvoltage commonly occurs during load rejection, which is when there is an abrupt removal of the load from the generator. When the load is suddenly disconnected, the generator continues to produce electrical energy, but without the load to absorb it, the excess energy can cause an increase in voltage levels within the generator.

This event leads to a potential imbalance between power output and power demand, resulting in the voltage rising above normal operating values. In power generation systems, protective equipment and control systems are often in place to mitigate the risk of overvoltage during such occurrences, but load rejection remains a critical scenario that operators must manage effectively.

In contrast, increased frequency can indeed contribute to overvoltage conditions as well, but it is usually a consequence rather than a direct cause during a specific event like load rejection. Routine maintenance and regular operation generally do not precipitate overvoltage situations, as those conditions are typically controlled and monitored more closely to maintain stable power generation and distribution.