The AS480 Stamford AVR is a half wave phase controlled AVR which forms part of the excitation system of the brushless generator. The design employs Surface Mount Technology (SMT), custom mouldings and heatsinks to produce a compact AVR assembly. The AVR also incorporates an interface to the optional Excitation Boost System (EBS) for use where short-circuit current maintenance is required.
The Stamford AS480 AVR is linked with the main stator windings and the exciter field windings to provide closed loop control of the output voltage with load regulation of +/- 1.0%. The AVR voltage sensing terminals continuously sample the output windings for voltage control purposes. In response to this sample voltage, the AVR controls the power fed to the exciter field, and hence the main field, to maintain the machine output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator.
Positive voltage build up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR AS480.
Technical Specification:
Sensing and Power Input:
Voltage : 100- 264 V ac 1 phase
Frequency: 50- 60 Hz nominal
Output:
Voltage: 82 V dc @ 200 V ac power input
Voltage: 45 V dc @ 110 V ac power input
Regulation: +-1%
