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AVR AS4440 for Stamford Generator

(1 customer review)

  • AS440 is a half-wave phase-controlled thyristor type AVR
  • Sensing Input: Voltage Jumper selectable 100-130 Vac 1 phase or 190-264 Vac 1 phase
  • Output:Voltage 82 V d. C. @ 200 V a. C
  • Frequency: 50-60 Hz nominal
  • Regulation:+/- 1.0%
  • Soft Shell
  • Stamford Logo on the back
  • Click Here To Download AS440 User Manual

 14,500.00  18,000.00

Buy all Stamford AVRs and Rotating Rectifier assemblies in Pakistan. You can buy AVR AS440 for Stamford Generator online anywhere from Pakistan or by visiting Electronic Power House (EPH) and Tetralink Technologies (TLT)   in Lahore who are the main distributors of Stamford in Pakistan. All original Stamford products are available at very reasonable and best prices in Pakistan

Key Features:

  • AS440 is a half wave phase-controlled thyristor type AVR
  • Sensing Input:Voltage Jumper selectable 100-130 Vac 1 phase or 190-264 Vac 1 phase
  • Output:Voltage 82 V d. C. @ 200 V a. C
  • Frequency: 50-60 Hz nominal
  • Regulation:+/- 1.0%
  • Soft Shell
  • Stamford Logo on the back

General description

AS440 for Stamford generator is a half-wave phase-controlled thyristor type AVR and forms part of the excitation system for a brushless generator. The design employs Surface Mount Technology (SMT) for the high integration of features in a small footprint AVR.
Positive voltage builds up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR. The power and voltage sensing circuits have separate terminals, allowing the excitation power to be derived directly from the stator winding for basic applications or from an auxiliary winding if sustained short circuit performance is required.
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%.
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.
A frequency measuring circuit continually monitors the generator output and provides 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.
Over excitation conditions are limited to a safe period by a protection circuit within the AVR. Provision is made for the connection of a remote voltage
trimmer, allowing the user fine control of the generator’s output.
Analogue input is provided allowing connection to the Power Factor controller or other external devices with compatible output. The AVR has the facility for droop CT connection, to allow parallel running with other similarly equipped generators.

brands

STAMFORD

color

Black

Technical Specification

SENSING and POWER INPUT

Voltage   100-264 V ac 1 phase Frequency     50-60 Hz nominal

OUTPUT

Voltage      82 V d.c. @ 200 Va.c power input. Voltage      45 V d.c. @ 110 Va.c power input.

Current    continuous 5A (see note 1). transient 7.5A for 10 secs.

Resistance   15 ohms min

REGULATION

+/- 1.0% (see note 2)

THERMAL DRIFT

0.03% per deg. C change in AVR ambient (see note 3)

TYPICAL SYSTEM RESPONSE

AVR response                                   20ms

Field current to 90%                         80 ms

Machine Volts to 97%                       300ms

EXTERNAL VOLTAGE ADJUSTMENT

+/-10% with 1 k ohm 1 watt trimmer (see note 4) Increasing resistance lowers voltage.

Fixed 15kOhm resistor enables 110V sensing

UNDER FREQUENCY PROTECTION

Set point                94 -98% Hz (see note 5)

UNIT POWER DISSIPATION

12 watts maximum

BUILD UP VOLTAGE

4 Volts @ AVR terminals

QUADRATURE DROOP INPUT

10 ohms burden

Max. sensitivity: 0.07 A for 5% droop 0PF Max. input: 0.33 A

OVER EXCITATION PROTECTION

Set point           67 Vdc +/-3% (fixed) Time delay           10-15 seconds (fixed)

ENVIRONMENTAL

Vibration           20-100 Hz            50mm/sec

100Hz – 2kHz      3.3g

Operating temperature                 -40 to +70C (note 6)

Relative Humidity 0-70C              95% (note 7)

Storage temperature                    -55 to +80C

 

Based on 1 review

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  1. admin

    We have many satisfied customers who have used this product and found it perfect for their brushless generators.

    admin

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