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FUNCTION CHARACTERISTICS
43
NVA100X-D - Manual - 02 - 2016
Analog processing
The following are envisaged:
Anti aliasing fi lter circuits,
Amplifi er circuits for conditioning the input signals,
Reference voltage adjustment circuits for the measurement A/D converter.
The Pro-n relays use a DSP processor operating at 40 MHz; it performs all the processing on the
analogue signals and furthermore coordinates management of the TX-RX signals to the CPU.
The input currents are sampled at a frequency of 24 samples per period by means of a dual conver-
sion system which allows the attainment of information pertaining to polarity and amplitude with high
resolution. The measurement criterion allows precise measurement of even those signals having a
unidirectional component, such as transient currents with overlapping exponential, which typically
appear during faults.
The circuit board also houses the output relays with the corresponding command and control cir-
cuits, communication circuits, buttons, LCD display, LEDs and the key switch.
CPU
A 32 bit CPU is provided.
The following are envisaged:
Real Time Clock circuits with oscillator and super capacitor,
RS232 communication port,
RS485 communication port,
Thybus communication circuits for external modules and MMI board,
Network communication circuits (optional Ethernet).
Memories:
SRam: high speed static memory, used for data and cache,
Flash memory: used for fw storage and upgrade,
EEprom memory: used for calibration data storage,
FPGA for data transfer between CPU and DSP.
Input board
Depending on the version (inductive CT and VT inputs or ThySensor) respectively the module in-
cludes:
Three CTs committed for phase currents acquisition
One CT committed for residual current acquisition
The input circuits are suitable for 1 A or 5 A external CTs
[1]
Three VTs committed for phase voltages acquisition
One VT committed for residual voltage acquisition.
or:
Six voltage inputs for the measurement of the three currents and three phase voltages
One CT committed for residual current acquisition
MMI (keyboard, LED and display)
The MMI module (Man Machine Interface) includes:
An eight keys 8 keyboard,
a backlight graphic LCD display,
Sixteen signalling LEDs.
An Ethernet port for local interface
Note 1 The phase and residual nominal currents must be adjusted by means dip-switch.
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