What happens to the voltage delivery of a separately excited generator as the load increases?

In a separately excited generator, the field winding is powered by a separate source, allowing for stable control over the excitation level and, consequently, the output voltage. As the load on the generator increases, the generator is designed to maintain a nearly constant output voltage. This characteristic is due to the automatic voltage regulation systems that adjust the excitation to compensate for changes in load and maintain a steady voltage level.

When additional load is applied, the generator can respond by increasing the field current if it detects a drop in output voltage. This helps in maintaining the delivery voltage at the predetermined level, ensuring consistent performance and reliability in power delivery. Therefore, under normal operating conditions, the output voltage remains constant even with fluctuations in load, which is a key feature of separately excited generators.