1. Rated Power P(kW) or S(kVA): P is the generator's output active power (P = √3IVcosφ), and 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 standard specifies 50Hz for AC generators and 400Hz for medium-frequency generators.

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 rotor at the rated power. Currently, 1500r/min is commonly used for three-phase generator sets, while single-phase generator sets typically use 3000r/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: Refers to the direct current voltage applied to the excitation winding when the rated excitation current is reached.

9. Excitation Method: Power sources for excitation current are categorized as external excitation and internal excitation. External excitation comes from outside the generator, while internal excitation comes from the generator itself. Both are collectively referred to as excitation methods. External excitation methods include shunt and compound types; internal excitation methods include types such as pole reversal field excitation, AC exciter excitation, reactance phase-shifting excitation, resonant phase-shifting excitation, third harmonic excitation, and SCR excitation, among others.

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.