Environmental Engineering Reference
In-Depth Information
ERP, PRP1, PRP2 commands duplicate at cross
output cabinet outputs; in this case a separate in-
dependent output is provided for each commands
receiver and each reserved channel in the receiver
(if there are such channels). Cross output cabinet
also performs logical processing (according to
“two or more of three” condition) and sending of
signals to alarm devices, installed in the MCR,
which indicate the reasons of protection actuations
and set condition (failure, removal for testing or
maintenance).
Workstation realized on base of industrial
computer or server, performs the receiving of
messages from signal forming cabinets and cross
output cabinet, accumulating of received data in
the operative (hour), day and long-term (up to one
year) archives, displaying and registration of the
current and archived information.
In order to receive messages from signal form-
ing cabinets and cross output cabinet transmitted
via fiber-optic lines, workstation is equipped
with USB-OPTO interface adapters which are
installed in free positions (slots) and connected
to the industrial computer USB-ports.
Workstation displays allow to supervise the
condition of each channel input and output sig-
nals, sending of ERP, PRP1, PRP2 commands, set
operating mode, temperature in three positions in
each cabinet, doors opening and shutting, non-fire
condition inside the cabinet. The workstations
display information is showed in form of tech-
nological symbolic circuits, tables, diagrams,
text messages. Data are updated not less than one
times in two seconds.
SHC E&PRP energy supply is performed
directly from NPP auxiliary power (from two
interredundant sources) by three-phase alternat-
ing current with nominal power 380 / 220 V and
frequency 50 Hz. The allowed continuous devia-
tion of the supply voltage is from minus 15% to
plus 10%, frequency - from minus 2% to plus 2%
of the nominal value. Workstation and automated
operator workplace equipment is designed for
supply from alternating current with the 220 V
nominal voltage and 50 Hz frequency and con-
tain uninterruptible power supply blocks which
provide performance within at least hour in case
of network outage.
The element base used in SHC E&PRP (oper-
ating amplifiers, digital to analog and analog to
digital converters, galvanic isolation elements,
discrete logical elements, safety systems relay,
resettable fuses and others) are purchased in the
leading companies (Motorola, Fairchild, Sam-
sung, MAXIM, etc.). For realization of reactor
emergency and preventive protection function
(receiving of digital data, violation detection,
digital messages encryption and decryption,
processing according to logical condition “two
or more of three”, control signals forming) pro-
grammable integrated logic circuit are (FPGA of
Apex EP20K200 and Cyclone EP1C12 families
ALTERA company). Both FPGA families provide
great integration level, high operating speed, low
power consumption, which became one of the
factors that allowed to provide structure simplic-
ity, compactness and effectivity of SHC E&PRP.
The development of FPGA logical structure
is supported by Quartus instrumental designing
system (environment) by ALTERA company,
with addition of special Cyclone family FPGA
modules. The realization of elements connection
(implementation of the developed logical structure
into FPGA) is provided by the special interface
equipment supplied by FPGA developer.
The test of SHC E&PRP technical condition
is performed automatically after power switch-on
and continuously during the working process.
After the switch-on, the component parts working
capacity, operability of input and output circuit,
absence of distortions in programs, correctness
of data transmission via communication lines are
controlled. During the operation, power supply,
temperature and smoke level monitoring inside
cabinets, absence of program hang-ups, validity of
input signals and digital data, proper performance
of each channel are permanently and automatically
controlled. In case of any failure detection, work-
Search WWH ::




Custom Search