UNS0980c-P V3 HIEE405205 R3

Various other auxiliary functional units:
1) Maximum excitation current limiter. Limit the total current value of the thyristor rectifier bridge output below the given excitation cap value current.
2) excitation overcurrent limiter. When the strong excitation or overcurrent reaches the allowable time, the excitation current is reduced to the long-term allowable maximum.
3) underexcitation limiter. According to the need of generator and power system stability calculation, the minimum output current of thyristor rectifier bridge is limited to the given value of active power.
4) Voltage/frequency limiter. It is mainly used during the no-load operation when the generator is disconnected from the power grid, to prevent the unit from running below the power frequency due to the governor failure, resulting in false strong excitation and over-excitation failure.
(6) Manual unit. In the early stage, the excitation was adjusted manually by open-loop mode, and later by closed-loop mode with excitation current as the signal source.
(7) Tracking unit. At each moment when the regulator is adjusted in “automatic mode” according to the generator terminal voltage as the signal closed loop, the tracking unit will “automatically and tightly track the excitation current signal of the manual unit corresponding to the aforementioned voltage signal”, so as to ensure that there will be no large fluctuations in excitation when the “automatic” is switched to the “manual” mode. When the “automatic” regulation mode of the regulator has one main channel and one standby channel, it is necessary to ensure that the standby channel automatically tracks the signal of the main channel.

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