1、 The voltage setting scale refers to the scale of the maximum and minimum voltage that can be reached by adjusting the manual or active voltage regulator on the control panel when the generator is running at an additional speed without load. Under normal circumstances, the no-load voltage setting scale is 95% to 105% of the additional value.

2、 Transient voltage adjustment rate

Transient voltage regulation rate refers to the rate of change in instantaneous voltage of a generator during sudden increase or decrease of load when the generator is unloaded and the speed and voltage reach additional values σ US indicates.

3、 Steady state voltage adjustment rate

The steady-state voltage regulation rate refers to the rate of change in steady-state voltage of a synchronous generator under all load conditions from no load to additional load δ U indicates.

Under normal circumstances, the steady-state voltage adjustment rate of synchronous generators under different load conditions is not the same. When adding a rational load to the generator, the steady-state voltage value after the load change should be lower than the no-load setting voltage; When adding a capacitive load to the generator, the steady-state voltage value after the load change should be higher than the no-load stable voltage. The magnitude of the error in no-load setting voltage depends on the tuning ability of the active voltage regulator (AVR). In general, the higher the tuning accuracy of the voltage regulator, the smaller the error in no-load setting voltage, and the smaller the steady-state voltage adjustment rate.

4、 Voltage stability moment

The voltage stability time refers to the time required for the generator to stabilize within a regular scale from sudden load application when it is in no-load condition and the voltage reaches an additional value, indicated by s. The voltage stability time for Class I, II, and III power plants is 0.5~ls, and for Class IV power plants it is 3 seconds.

5、 Steady state frequency adjustment rate

The steady-state frequency adjustment rate refers to the ratio of the difference in frequency stability of a synchronous generator before and after a load change to the additional frequency δ F indicates.

6、 Voltage fluctuation rate

Voltage fluctuation rate refers to the degree of voltage fluctuation of a synchronous generator when the load remains constant δ UB indicates.

7、 Frequency fluctuation rate

Frequency fluctuation rate refers to the degree of frequency fluctuation of a generator set when the load remains constant δ FB indicates.

8、 Transient frequency adjustment rate

The transient frequency adjustment rate refers to the ratio of the difference between the frequency of the generator set and the frequency before the load change when suddenly adding or reducing a load, and the additional frequency δ Fs indicates.

9、 Sinusoidal waveform distortion rate of no-load line voltage

The voltage waveform output by the generator set under normal conditions should be a sine wave, but it has been found through experiments that the induced electromotive force of the generator is also rich in third-order or higher harmonics. Due to the presence of higher-order harmonics, the voltage waveform output by the generator will exhibit sinusoidal distortion. When the distortion rate of the sinusoidal waveform of the no-load line voltage is too large, it can cause overheating of the generator and a decrease in edge function. Under normal circumstances, the distortion rate of the sinusoidal waveform of the line voltage of a generator set at no-load voltage should not exceed 5%.

10、 Frequency stability moment

Frequency stability time refers to the time required for a generator to stabilize its frequency within a regular scale from sudden load application when it is unloaded and the frequency is an additional value, denoted as S'. The frequency stability time for Class I, II, and III power plants is 2-5S'. For Class IV power plants, it is 7S'.

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