Manual Voltage Regulators

An 'emergency' hand-controlled excitation system can constitute an operational advantage for an a.c. generator. Although manual control in the event of AVR failure is not normally very practicable, it can nevertheless be usefully exploited to permit a hand-controlled machine to 'trail' in parallel with a master generator with a healthy AVR. Manual control can also be useful for the provision of a controlled level of short-circuit current for the 'frequency' starting of relatively large motors for the 'dynamometer' loading of motors or engines; and for the control of static loads.