Generator - 63kVA

Particularities

The generator is a two-pole compounded synchronous machine.

The compounding is used for voltage maintenance. The principle can be simplified as follows:

A load connected to the generator provides a current flow through the windings of the generator. Since these windings have an ohmic resistance, a voltage drop occurs at this resistor. This means that the voltage at the terminals of the generator drops. A light bulb connected to the terminals would be brighter or darker, depending on whether consumers are switched on or off. The load current of a load is passed through a (compound) transformer. This transformer controls the excitation current through the windings of the exciter field. If the load current increases, the current of the transformer is also increased and thus the excitation field is amplified. A strengthened excitation field in turn ensures increased voltage at the terminals of the generator. The voltage is thus kept approximately constant. For new machines, the voltage is kept electronically constant.

What has been changed on the generator?

The generator was not as busy as the engine. Only the grease of the ball bearings, which was rather crumbly than greasy, had to be renewed. For this purpose, the generator was removed and disassembled. The rotor was pulled to make the bearings easier to access. Of course, the generator main line to the main distribution has also been replaced by a new H07RN-F 5G50 line.