Loss of excitation in generator

Loss of excitation in a generator refers to a situation where the magnetic field in the generator collapses due to a failure in the excitation system. The excitation system is responsible for maintaining the magnetic field in the generator, which is essential for the generation of electricity.

When the excitation system fails, the generator loses its ability to generate power, and the voltage and frequency of the output will drop rapidly. This can cause a range of problems, including voltage instability, voltage collapse, and eventually, a complete shutdown of the generator.

To prevent loss of excitation, most generators are equipped with protective devices that monitor the excitation system and automatically shut down the generator if any abnormalities are detected. These protective devices include overvoltage relays, under frequency relays, and voltage regulators.

If loss of excitation does occur, it is important to act quickly to prevent damage to the generator and to avoid disruptions to the power system. This may involve manually reconnecting the excitation system or restoring the generator to service using an auxiliary power source. In some cases, it may be necessary to perform repairs or maintenance on the generator to prevent further loss of excitation.