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: Typically marked as 400V/230V, indicating that the three-phase rated voltage is 400V and the single-phase rated voltage is 230V.

3. Rated Frequency f: National standards stipulate that industrial frequency units are 50Hz, and medium frequency units are 400Hz.

4. Rated Current I: Refers to the size of the current that the generator stator winding is allowed to carry continuously.

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 operate at 3000 r/min.

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

8. Rated excitation voltage Vf: The direct current 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, and from the generator itself is called self-excitation. Both external and self-excitation are collectively referred to as excitation methods. The external excitation method includes 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, inductive phase compensation excitation, resonant phase compensation excitation, third harmonic excitation, and SCR excitation.

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