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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
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3
2 Hardware Configuration of the Device
With an aim to executing the above functions in a set of hardware system and taking flexibility and
adaptability of the device into consideration, modular design is conducted for the device. The device is
composed of the following modules:
2.1 AC and DC input module (AC/DC)
Three kinds of converting circuits are set according to different types of input signals.
AC voltage: set isolation conversion of intermediate transformer, such as extreme voltage of generator
and high-tension side voltage of main transformer etc.
AC current: set isolation conversion of intermediat converter and obtain voltage at secondary side
parallel resistance. 1A and 5A converters are selected and secondary resistance is changed to meet the
requirement of measurement ranges of different currents, such as extreme current of generator and neutral
point current etc.
DC voltage and current: set advanced isolated conversion of hall sensor, such as rotator voltage of
generator and diverter voltage of rotator.
2.2 Host processing module (CPU)
All analogs resulting from conversion by AC and DC input modules can effectively filter out signals
within pass band through active filter with lowpass filtering and bandpass filtering to meet filtering
requirements of different frequency signals and achieve less than 1% of attenuation of fundamental wave,
and concurrently attenuation ratio and phase shift of analogs of all channels can reach good consistency.
Figure 2-1: Hardware of NSC 554 generator protection device
POWER
POWER
POWER
POWER
AC
AC
AC
AC
CPU
CPU
CPU
CPU
MMI
Conversion
module
of
AC and DC
input
(TA
and TV etc.)
A/D
CPU
Processor
CAN communication
Output
and
signal
Power
Voltage input
Current input
Human-
machine
dialogue
TRIP
TRIP
TRIP
TRIP
DC input