PRISMIC ® A32 Excitation Controller0 pages

PRISMIC® A32
Excitation Controller
PRODUCT SPECIFICATION
Introduction
Features
The BRUSH PRISMIC® A32 excitation controller or automatic
voltage regulator (AVR) incorporates all the features usually
required for control of a Brushless generator equipped with a
single phase permanent magnet generator (PMG) pilot exciter.
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High integrity dual redundant excitation system in a single
19 inch enclosure
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Built in power system stabiliser
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Negative forcing of exciter field voltage
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SCADA/DCS communications using Ethernet EGD or
RS232/RS485 Modbus protocol
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Conforms to CE directives and CSA/UL approval pending
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Compatible connections with earlier BRUSH products for
easy upgrades
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Automatic tracking between channels in all modes
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Built in colour TFT operator interface
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Including PC Human Machine Interface (HMI) software
for advanced maintenance diagnostics and downloading
of data
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Digital (discrete) outputs for remote status indication
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Analogue input signal for special applications
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Modes of operation include generator terminal voltage
control, power factor control, VAr control and offload VArs
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Monitoring of rotating rectifier health and diode failure
indication
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The following limiters are included:
PRISMIC® A32 Excitation Controller
The A32 includes two fully featured independent controllers
and two independent power circuits within a single 6U 19 inch
enclosure. Each controller acts as a hot standby for the other
and each channel is independently controlled with automatic
tracking included to enable smooth transfer from one controller
to the other.
The A32 is one of the first excitation controllers to provide
features such as an integrated power system stabiliser, a colour
TFT display and Ethernet connectivity integrated into a single
standard 19 inch rack package. These features also use already
proven BRUSH technologies that have been developed for other
BRUSH products and which are now in operational service with
many large generating sets.
- Over excitation limiter
- Under excitation limiter
- Over flux limiter
- Fast acting field current limiter
- Stator current limiter
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Automatic switching to standby initiated by the
following conditions:
- Over voltage monitor triggered
- Under voltage monitor triggered
- Over excitation monitor triggered
- Under excitation monitor triggered
- Over flux monitor triggered
- Voltage sensing error
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Rotor earth fault detector input included eliminating the
need for separate unit
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Auxiliary power supply input allows easy setting of unit
without PMG supply present
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Limiter and Monitor Settings
Speed detector included eliminating the need for
separate speed switch unit
Soft start for controlled application of excitation