Description

AVR STAMFORD SX440

Bộ điều áp máy phát điện Avr Stamford SX440 (General description Technical specification)

SX440 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

1..INPUT:

Voltage 190-264V ac Frequency 50-60 Hz nominal Phase 1 Wire 2

circuitry includes under-speed and sensing loss protection features. Excitation
power is derived directly from the generator terminals.

Positive voltage build 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 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.

An analogue input is provided allowing connection to a Newage 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.

2.OUTPUT:
Voltage max 90V dc at 207V ac input Current continuous 4A dc
Intermittent 6A for 10 secs Resistance 15 ohms minimum
REGULATION
+/- 1% (see note 1)

3.THERMAL DRIFT
0.04% per deg. C change in AVR ambient (note 2)

4.TYPICAL SYSTEM RESPONSE
AVR response 20ms
Filed current to 90% 80 ms
Machine Volts to 97% 300ms

5.EXTERNAL VOLTAGE ADJUSTMENT
+/-10% with 1 k ohm 1 watt trimmer (see note 3)

6.UNDER FREQUENCY PROTECTION
Set point 95% Hz (see note 4) Slope 170% down to 30 Hz

7.UNIT POWER DISSIPATION
12 watts maximum
8.BUILD UP VOLTAGE
4 Volts @ AVR terminals
9.ANALOGUE INPUT
Maximum input +/- 5V dc (see note 5)
Sensitivity 1v for 5% Generator Volts (adjustable) Input resistance 1k ohm
10.QUADRATURE DROOP INPUT
10 ohms burden
Max. sensitivity: 0.07 A for 5% droop 0PF Max. input: 0.33A
11.ENVIRONMENTAL
Vibration 20-100 Hz 50mm/sec
100Hz – 2kHz 3.3g
Operating temperature -40 to +70 ᵒC
Relative Humidity 0-70 ᵒC 95% (see note 6)
Storage temperature -55 to +80 ᵒC
*NOTES
1. With 4% engine governing.
2. After 10 minutes.
3. Applies to Mod status S onwards. Generator de-rate may apply. Check with factory.
4. Factory set, semi-sealed, jumper selectable.
5. Any device connected to the analogue input must be fully floating (galvanically isolated
from ground), with an
gth of 500V ac.
6. sing.

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