1. Rated Power P (kW) or S (kVA): P is the generator's output active power (P = √3IVcosφ), S is the generator's apparent power (S = √3IV).

2. Rated Voltage V: Generally marked as 400V/230V, meaning the three-phase rated voltage is 400V, and the single-phase rated voltage is 230V.

3. Rated Frequency f: National standards specify 50Hz for AC generators and 400Hz for intermediate frequency generators.

4. Rated Current I: Refers to the size of the current that the generator stator winding can allow to pass through over a long period.

5. Rated power factor cosφ: Three-phase generator is 0.8 (lagging), single-phase generator is 0.9 (lagging) and 1.0.

6. Rated Speed n: The rotational speed of the generator's rotor at the rated power. Currently, 1500 r/min is commonly used for three-phase generator sets, while single-phase generator sets typically use 3000 r/min.

7. Rated excitation current Ir: The direct current flowing through the excitation winding of an AC generator under rated load conditions.

8. Rated excitation voltage Vf: The direct voltage applied to the excitation winding when the rated excitation current is reached.

9. Excitation Method: The power source providing excitation current, coming from outside the generator, is called external excitation, while the one coming from the generator itself is called self-excitation. Both external and self-excitation are collectively referred to as excitation methods. The external excitation method is divided into two types: shunt excitation and compound excitation. The self-excitation method includes various types such as convex pole reverse magnetic field excitation, AC excitation machine excitation, reactor phase shift excitation, resonant phase shift excitation, third harmonic excitation, and thyristor excitation.

10. Reliability Indicator MTBF: According to GJB235A-1997 "General Specification for AC Mobile Power Stations," the average failure interval time for diesel engines is specified as 500h, 800h, and 1000h.