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 a three-phase rated voltage of 400V and a single-phase rated voltage of 230V.

3. Rated Frequency f: National standards specify that the power frequency units are 50Hz, and the intermediate 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 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 the AC generator under rated load conditions.

8. Rated Excitation Voltage Vf: Refers to the direct current voltage applied to the excitation winding when the rated excitation current is applied.

9. Excitation Method: The power supply for excitation current can be from external to the generator, referred to as external excitation, or from the generator itself, referred to as self-excitation. Both external and self-excitation are collectively known as excitation methods. The external excitation method is divided into two types: shunt excitation and compound excitation; while the self-excitation method includes various types such as convex pole reverse 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 of diesel engines is specified as 500h, 800h, and 1000h.