The GAVR-20A Automatic Voltage Regulator features a rugged compact design. The GAVR-15A is a universal brushless generator AVR 20A, voltage stabiliser with universal 20 Amp 1/2 wave self excited dip-switch programmable automatic voltage regulator module. 220/440 VAC Programmable Input with Under Frequency Protection. Also features Soft Start Voltage Ramping and EMI Suppression and a built-in high capacity 15 Amp Fuse to protect the unit in cases of power surges. Package includes 1 x AVRGAVR-20A and 1 x User Manual.
Technical Specifications of the GAVR-20A Automatic Voltage Regulator
SENSING INPUT: Voltage : 220/400V AC, 1 phase 2 wire
POWER INPUT: Voltage : 180-240V, 1 phase 2 wires
OUTPUT: Voltage : max 90V DC at 240V AC input; Current : continuous 6A,Intermittent 12A for 10 secs; Resistance : Min.10Ω Max.100Ω
VOLTS REGULATION: < ± 0.5% (with 4% engine governing) VOLTAGE BUILD-UP: Residual volts at AVR terminal > 5 VAC
EXTERNAL VOLTS ADJUSTMENT: ± 7% with 1K Ω, 1 Watt trimmer
UNIT POWER DISSIPATION: MAX 8 Watt
THERMAL DRIFT: 0.05% per °C change in AVR ambient temperature
UNDER FREQUENCY PROTECTION: 60 Hz system presets knee point at 57Hz; 50Hz system presets knee point at 47Hz
Reasons for using the GAVR-15A Automatic Voltage Regulator
Power generators, as ones used by standby power systems, will have automatic voltage regulators to stabilise their voltages as the load on the generators fluctuates. Originally, AVRs for generators were electromechanical in nature, but a modern AVR uses solid-state devices. An AVR acts as an feedback control system that gauges the output voltage of the generator, compares that output to a set reference point, and generates an error signal that is used to adjust the excitation of the generator. As the excitation current in the field winding of the generator increases, its terminal voltage will increase. The AVR will control current by using power electronic devices; generally a fraction of the generator’s output is used to feed current for the field. Where a generator is connected in parallel with other sources such as an electrical transmission grid, changing the excitation has more of an effect on the reactive power produced by the generator than on its terminal voltage, which is mostly set by the connected power system.