Automatic Voltage Regulator (AVR) | AVR SX440 | AVR for Generator Genset
The SX440 serves as a two-phase sensed Automatic Voltage Regulator (AVR) and integral part of brushless generator excitation systems. By monitoring voltage in the main generator winding, it adjusts power to the exciter stator, ensuring stable output voltage within specified limits despite load variations, temperature changes, and power factor shifts. Its excitation power comes from a three-phase permanent magnet generator (PMG), isolating AVR control circuits from nonlinear loads and minimizing radio frequency interference. The PMG system also enables sustained generator short circuit current. Additionally, the AVR offers droop CT connection capability, facilitating parallel operation with similarly equipped generators.
- SX440 is a two phase sensed Automatic Voltage Regulator(AVR)
- Input:190-264V ac max, 1 phase 2 wire
- Output:max 120V/DC
- Regulation: +/-1%
- Vibration:20 -100HZ (50mm/sec), 100Hz -2kHz
Technical specification
| INPUT | |
| Voltage | 190-264V ac |
| Frequency | 50-60Hz nominal |
| Phase | 1 |
| Wire | 2 |
| OUTPUT | |
| Voltage | max 90V dc at 207V ac input |
| Current | continuous 10A dc |
| Intermittent 16A for 10 secs | |
| Resistance | 10 ohms minimum |
| Regulation | +/ – 1% (see note 1) |
| THERMAL DRIFT | 0.04% per deg. C change in AVR ambient (note 2) |
| TYPICAL SYSTEM RESPONSE | |
| AVR response | 20 ms |
| Filed current to 90% | 80 ms |
| Machine Volts to 97% | 300 ms |
| EXTERNAL VOLTAGE ADJUSTMENT | +/-10% with 1 k ohm 1 watt trimmer (see note 3) |
| UNDER FREQUENCY PROTECTION | |
| Set point | 95% Hz (see note 4) |
| Slope | 170% down to 30 Hz |
| UNIT POWER DISSIPATION | 12 watts maximum |
| BUILD UP VOLTAGE | 4.8 Volts @AVR terminals |
| ANALOGUE INPUT | |
| Maximum input | +/- 5V dc (see note 5) |
| Sensitivity | 1 v for 5% Generator Volts (adjustable) |
| Input resistance | 1 k ohm |
| QUADRATURE DROOP INPUT | 10 ohms burden |
| Max. sensitivity: 0.07 A for 5% droop OPF | |
| Max. input: 0.33 A | |
| ENVIRONMENTAL | |
| Vibration | 20-100 Hz 50mm/sec |
| 100 Hz – 2k Hz 3.3g | |
| Operating temperature | 40 to +70 °C |
| Relative Humidity 0-70 °C | 95% (see note 6) |
| Storage temperature | -55 to +80 °C |
