The main functions of the AVR are:
Potential Divider and Rectifier takes a proportion of the generator output voltage and attenuates it. The potential divider is adjustable by the AVR Volts potentiometer and external hand trimmer (when fitted). The output from the droop CT is also added to this signal. An isolating transformer is included allowing connection to various winding configurations. A rectifier converts the a.c. input signal into d.c. for further processing.
The Sensing Loss Detector is an electronic changeover switch, which normally connects the Amplifier (Amp) to the Voltage Sensing input and automatically changes over to the Power input when the normal sensing voltage is lost. Potential Divider and Rectifier takes a proportion of the generator output voltage and attenuates it. The potential divider is adjustable by the AVR Volts potentiometer and external hand trimmer (when fitted). The output from the droop CT is also added to this signal. An isolating transformer is included allowing connection to various winding configurations. A rectifier converts the a.c. input signal into d.c. for further processing.
The DC Mixer adds the Analogue input signal the Sensing signal.
The Amplifier (Amp) compares the sensing voltage to the Reference Voltage and amplifies the difference (error) to provide a controlling signal for the power devices. The Ramp Generator and Level Detector and Driver infinitely control the conduction period of the Power Control Devices and hence provides the excitation system with the required power to maintain the generator voltage within specified limits.
The Stability Circuit provides adjustable negative ac feedback to ensure good steady state and transient performance of the control system.
The Low Hz Detector measures the period of each electrical cycle and causes the reference voltage to be reduced approximately linearly with speed below a presettable threshold. A Light Emitting Diode gives indication of underspeed running.
The Synchronising circuit is used to keep the Ramp Generator and Low Hz Detector locked to the generator waveform period.
The Low Pass Filter prevents distorted waveforms affecting the operation of the AVR control circiut
Power Control Devices vary the amount of exciter field current in response to the error signal produced by the Amplifier.
Suppression components are included to prevent sub cycle voltage spikes damaging the AVR components and also to reduce the amount of conducted noise on the generator terminals..
The Power Supply provides the required voltages for the AVR circuitry.
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The Low Hz Detector measures the period of each electrical cycle and causes the reference voltage to be reduced approximately linearly with speed below a presettable threshold. A Light Emitting Diode gives indication of underspeed running.
The Synchronising circuit is used to keep the Ramp Generator and Low Hz Detector locked to the generator waveform period.
The Low Pass Filter prevents distorted waveforms affecting the operation of the AVR control circiut
Power Control Devices vary the amount of exciter field current in response to the error signal produced by the Amplifier.
Suppression components are included to prevent sub cycle voltage spikes damaging the AVR components and also to reduce the amount of conducted noise on the generator terminals..
The Power Supply provides the required voltages for the AVR circuitry.
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