Oscillation Gain Attenuation for Accurate Signal Detection

The patent applies preliminary action by performing gain reduction before oscillation determination. The system reduces gain when real-time power or voltage exceeds rated values, then performs oscillation determination on the attenuated signal. This preliminary gain reduction prevents signal saturation and enables faster, more accurate oscillation detection without requiring long processing times to distinguish self-excited signals from normal signals.

The patent implements feedback by continuously monitoring real-time power or voltage, comparing it against rated values, and dynamically adjusting gain based on the comparison result. The system feeds back the oscillation determination result to control whether gain reduction is applied, creating a closed-loop control mechanism that improves both determination accuracy and response speed.

The patent applies parameter changes by transforming the oscillation determination approach from counting beating numbers to measuring real-time power or voltage values. The system changes the parameter being monitored from temporal frequency (beating count) to amplitude (power/voltage), and introduces gain reduction as an additional control parameter to bring high-amplitude signals into the measurable range, thereby improving both precision and reliability.

The patent implements preliminary anti-action by proactively reducing gain when signals approach rated levels, preventing the saturation and distortion that cause misclassification. This preemptive gain reduction eliminates the harmful effect of signal overload before it occurs, allowing accurate distinction between self-excited oscillations and high-amplitude stable signals.