Cummins Generator Technologies Products Stamford Electronic Control {AVR} Systems and Accessories AVR without short circuit maintenance

AVR Without Short-Circuit Maintenance

(AVR) AUTOMATIC VOLTAGE REGULATORS: AVR WITHOUT SHORT-CIRCUIT MAINTENANCE


Self excited Automatic Voltage regulators ('SX' and 'SA' Prefix) Stamford AVRs for self excited generators receive their power direct from the generator output terminals, and control generator output voltage through continual automatic adjustment of the main rotor field strength.

SX460
The SX460 is the standard AVR offered with generators in the lower power bands, achieving voltage regulation in the order of � 1.5 %. A feature of this (and all Stamford AVR's) is that output voltage is reduced with speed below the normal operating level, to assist the engine or prime mover to recover after sudden application of a heavy load. This is an ideal choice for applications where a generator set is to be run in a stand-alone application where no specialist requirements exist.

AS440
The AS440 has all the features of the SX460, additionally achieving voltage regulation in the order of � 1.0 %. A current transformer can be supplied with the SX440 to provide quadrature voltage droop for parallel operation with other generator sets, also a power factor control accessory can be fitted. The AS440 will also work with an auxiliary winding to support a short circuit and improve motor starting. A three phase sensing unit can be added to the AS440 AVR control system. The size of t his AVR is ideal for mounting in the terminal boxes of the small (BC) Stamford generator ranges.