Buy all Stamford AVRs and Rotating Rectifier assemblies in Pakistan. You can buy AVR SX460 Automatic Voltage Regulator with Soft Shell for Stamford Generator online anywhere from Pakistan or by visiting Electronic Power House (EPH) and Tetralink Technologies (TLT) in Lahore who are the main distributor of Stamford in Pakistan. All original Stamford products are available at very reasonable and best prices in Pakistan.
- SX460 AVR – Automatic Voltage Regulator – Exact Generic Replacement
- INPUT: Voltage: Jumper selectable 95-132V ac or 190-264V ac, Frequency: 50-60 Hz nominal, Phase: 1
- OUTPUT: Voltage: Max 90V dc at 207V ac input, Current: Continuous 4 A dc, Intermittent 6 A for 10 secs, Resistance: 15 ohms minimum.
- Regulation: +/-1.0% * Thermal drift: 0.05% per deg. C change in AVR ambient.
- Unit power dissipation: 10 watts maximum – Build up voltage：4 Volts @ AVR terminals.
- Soft Shell
SX460 is a half-wave phase-controlled thyristor-type Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brush-less generator.
In addition to regulating the generator voltage, the AVR circuitry includes under-speed and sensing loss protection features. Excitation power is derived directly from the generator terminals.
Positive voltage builds up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR.
The 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%.
In addition to being powered from the main stator, the AVR also derives a sample voltage from 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.
A frequency measuring circuit continually monitors the generator output and provides output under-speed protection of the excitation system, by reducing the output voltage proportionally with speed below a pre-settable threshold. A manual adjustment is provided for the factory setting of the under frequency roll-off point, (UFRO). This can easily be changed to 50 or 60 Hz in the field by push-on link selection.
Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator’s output.