MiCOM C264 Bay Controller Unit - Brochure EN-GB

MiCOM C264 Bay Controller Unit - Brochure EN-GB
MiCOM C264
Modular substation controller
Alstom's C264 substation controller is a sophisticated solution supporting many applications and functions
for substation control, communication, monitoring, protection and automation.
Flexibility, reliability and ease of use are among the top features required in a substation
computer; the MiCOM C264 has these features.
A combination of dual redundant fibre optic Ethernet, modular I/O, an expandable design and
an extensive library of functions make the C264 the ideal solution for a wide array of
applications in substation digital control systems.
In addition to the traditional data management (inputs and outputs) the MiCOM C264 can be
used as a:
> Remote Terminal Unit (RTU)
> Bay computer
> Feeder manager (protection & control)
> Substation automation processor
> Sequence of Events Recorder (SER)
> Automatic Voltage Regulator (AVR)
> Measurement centre
> Load shedding controller
> Protocol converter
> Substation gateway
Seamless modernisation of existing installations
The C264 provides seamless integration with existing substation assets, thanks to its flexible
interfaces and native expandability. Its powerful processing, communication and configuration
facilities make it the ideal tool for upgrading substation supervision, automation and
Innovative real-time automation schemes
MiCOM C264 enables innovative automation schemes thanks to extremely fast (event driven)
Programmable Scheme Logic (PSL) and robust Programmable Logic Control (PLC).
Optimised engineering
The multifunctional capabilities of the C264 optimise system engineering as fewer devices result
in less wiring, training and maintenance.
MiCOM C264
Bay/substation interlocking
Automatic Voltage Regulation (AVR)
Alstom's C264 provides two methods of
• A logical equation based method
• A topology based method, using
predefined rules and substation topology
The Automatic Voltage Regulation (AVR)
function is used to automatically maintain the
correct secondary side voltage of a tap
changing transformer.
The synchro-check function can be used in
conjunction with automatic or manual
reclosure. The function (limited to one bay)
determines the difference between the
amplitude, phase angles and frequencies of
two voltage vectors and uses this
information to determine whether or not to
close the breaker. Locking and coupling
modes are available and a deadline and
dead bus logic are also included.
Interlocks are managed as close to the
process as possible in order to provide the
best security of operation. Interlocking
conditions are graphically displayed in order
to immediately identify the interlocking
conditions (if any) and make the appropriate
changes before issuing the command.
Figure 1 Sample logical equations
Trip circuit supervision
The purpose of this function is to supervise
the continuity of the trip circuit of a circuit
breaker. Two options are available: two
wires or four wires. The two-wire option
verifies the trip circuit continuity when the
circuit breaker is closed.
AVR in the MiCOM C264 is a compact
voltage regulation solution for IEC61850
systems in electrical substations. It is able to
manage one transformer or up to four
transformers in parallel.
C264 AVR provides:
• Active and reactive compounding in order
to maintain the voltage at a remote location
• Homing in order to adjust a transformer to
the voltage of the busbar to which it will be
• For transformers in parallel: Minimizing
circulating current method, master/follower
• Optimised transformer ratio
IED gateway and data concentrator
The MiCOM C264 manages many types of
data: tap positions, controls, measurements,
disturbance records, settings, etc. Each item
of qualified data is uniquely referenced in
order to ensure full consistency of the
information, as well as allowing it to be reused in other parts of the system.
The MiCOM C264 can manage one autorecloser per bay (up to 12 bays per unit). The
integrated auto-reclosers can operate in 1
phase and/or 3 phase mode. Up to four autoreclosing cycles are available and the time
delay for each is independently configurable.
Auto reclosers can be initiated either
internally in the bay unit or via external
protection devices using digital inputs.
One of the main features of the C264 is to
concentrate and process data. This
information can come from a variety of
sources, both analogue and digital. For
example, when re-using existing equipment,
analogue data can be acquired directly from
current and voltage transformers and digital
data can be acquired over serial
communication links or via hardwired links.
The four-wire option permits verification of
the continuity whether the CB is open or
closed. In the case of single phase circuit
breakers the C264 can supervise the
continuity of the trip circuit separately for
each phase.
Figure 2 MiCOM C264 front view
(40TE variant)
MiCOM C264
Remote Terminal Unit (RTU)
The MiCOM C264 can be used as a Remote Terminal Unit (RTU), offering a powerful solution for SCADA communication, Sequence of Event
Recording (SER), and can be integrated into a substation Digital Control Systems (DCS).
• Up to 5012 digital inputs
• Up to 1024 digital outputs
• Up to 15 independent acquisition racks, communicating over Ethernet
• Up to 4 serial links on a rack (RS232/RS485/optical)
• Up to 2 simultaneous SCADA connections
• Up to 16 IEDs connected via each RS485 serial interface
Figure 3 Simple Alstom's DCS architecture using a single C264 substation controller
Sequence of Events Recorder (SER)
A reliable Sequence of Events Recorder (SER) is integrated into the MiCOM C264 for accurate event monitoring in electrical substations. Benefiting
from accurate time synchronisation, maintenance over Ethernet and an expandable architecture, the SOE function is able to locally store and print
up to 2000 time stamped events with a 1ms resolution. The 200 most recent events can be viewed on the local LCD screen. It also offers printer
status monitoring.
MiCOM C264
Feeder protection and control
The MiCOM C264 provides feeder management functionality through an optional independent dedicated module, hosting powerful protection and
automation functions. An efficient one box solution for HV and MV applications such as:
MV feeder lines,
Overhead lines and underground cables (back-up protection on HV systems)
Insulated, solid or resistance earthed and Petersen coil earthed neutral system,
Industry, Transport
Generator and transformer schemes
The C264 substation bay controller supports the following protection functions:
Phase & earth overcurrent (50/51, 50N/51N),
Phase & earth directional overcurrent (67, 67N),
Wattmetric (32N),
Negative sequence overcurrent (46).
Undercurrent (37),
Undervoltage (27) and Overvoltage (59) and residual Overvoltage (59N)
Over and Under-frequency (81O/81U),
Rate of frequency change (81R)
Thermal overload (49)
Breaker failure (50BF)
Figure 4 Protection functions in the MiCOM C264
MiCOM C264
Communication protocols
Binary counters
Alstom's MiCOM C264 is fully compatible
with many communication standards such
as UCA2/IEC 61850, IEC 60870-5-104,
DNP3, IEC 60870-5-101/103, and
Two types of binary counter are available;
single counters for single data points and
double counters for double data points.
Counters can be transmitted periodically or
on request. In the event of a supply
interruption the counters can resume from
their previously stored values.
At substation level and / or bay level an
optional redundant C264 can be used to
avoid the loss of critical functions.
Digital inputs
The MiCOM C264 offers five types of digital
• Single point
• Double point
• Multiple point
• System input for internal C264
• Logical combination of digital inputs
All inputs are acquired and time-stamped
with an accuracy of 1 ms.
Digital outputs
Digital outputs can be used to apply a
switching voltage to an external device.
These outputs can be controlled in one of
three ways:
• Select Before Operate once (SBO once)
• Select Before Operate many (SBO many)
• Direct execution
The SBO once mode is used for controls via
set points or ancillary devices, as well as
synchronised or non-synchronised circuit
breakers, transformers, disconnectors and
earthing switches. The SBO many (selection,
execution, and de-selection) control
sequence is used for the control of
Digital input processing
In addition to de-bouncing many
customisable filtering functions can be used
to process digital inputs, including:
• Toggle filtering
• Persistence filtering
• Motion filtering
• Undefined state filtering
Encoded digital data
The MiCOM C264 can interpret a group of
digital inputs as an encoded digital value.
Binary, Binary Coded Decimal (BCD), gray
code, decimal and 1 among N types of
encoding can all be processed. These values
can represent data such as process
measurements and tap positions.
Analogue inputs
Analogue measurements can be acquired
from either an analogue input board, a
transducerless measurement board (for
current and voltage transformers) or via a
communication network.
Analogue outputs
Analogue outputs can be used to interface
with auxiliary devices (measurement
viewers, generators, motors, etc). The
Analogue outputs are powered from an
external supply (48VDC) and can maintain
their value even if the C264 is powered
Measured and derived values
Directly measured values of voltage and
current can be measured using the
transducerless measurement board. Many
different values can be calculated from the
measured values including:
• RMS currents and voltages
• Network frequency and phase angle
• Active, reactive and apparent powers –
total and per phase
• Power factor
• Sequence components
• Derivatives: dF/dt, dV/dt, etc
Additionally a digital input can be manually
suppressed, substituted, forced invalid and
detected as faulty. Digital inputs can then be
transmitted on the substation LAN using the
desired protocol.
Figure 5 MiCOM Alstom C264
rear view (40TE variant)
Waveform recording
Maintenance web server
The MiCOM C264 provides two types of
waveform recording, Fast Waveform Record
(FWR), which stores samples at the
maximum sampling frequency and Slow
Waveform Record (SWR), which stores
RMS measurements over a longer period.
Both modes can run simultaneously.
Recording can be triggered by, the change of
state of binary digital inputs/outputs,
measurement threshold violations and a
request from an operator. Waveform
records are stored using COMTRADE 2001
binary format.
The maintenance web server can be used to
visualise maintenance data
(Hardware/Software, Communication, I/O
values) and to download the up-to-date
event log. It is directly accessible with a
standard Internet Browser.
Power quality
Alstom's C264 can measure the percentage
Total Harmonic Distortion (THD) (up to and
including 15th harmonic) and the Total
Demand Distortion (TDD) on voltage and
Self monitoring
Comprehensive self-monitoring procedures,
including power-on and continuous testing,
ensure that internal hardware or software
errors are detected and do not cause
malfunctions. If a fault is detected an alarm
will be issued and/or the watchdog contacts
will change state depending on the fault
Programmable logic
An operator can configure specific control
sequences or automation schemes (e.g.
automatic switching, System Integrity
Protection Schemes (SIPS), load shedding).
Such applications can be based on local or
remote data. Similarly the outputs can
perform local or remote actions.
Programmable logic can be implemented in
the C264 using either Programmable
Scheme Logic (PSL) or the Programmable
Logic Controller (PLC). PSL is for fast
automation applications (<5ms). It is eventdriven and so there is no cycle time. The
optional PLC tool is fully compliant with
IEC 61131-3. It can be used for complex
or sequential automation applications.
MiCOM C264
Local interface for control, operation
and display
The control of switching devices is possible
using a keypad and a graphical backlit LCD.
Operations can be performed in a simple
and intuitive way via up to 12 switchable
displays for bay control. Additionally there
are dedicated panels for monitoring (i.e.
measurements, events list, alarms, etc.),
display and maintenance. If required the
operator panel can be mounted separately
from the C264 (up to five meters away).
Access barriers can be used to guard against
inadvertent or unauthorised operations.
Event logging
Up to 2,000 events can be stored in nonvolatile memory. The events are time
stamped and stored in chronological order.
Time synchronization
The MiCOM C264 internal clock can be
synchronised via:
• An operator
• IRIG–B GPS clock (via the IRIG-B input)
• Ethernet SNTP server
• Remote SCADA (DNP3.0, IEC60870-5-101
or IEC60870-5-104)
In addition, the MiCOM C264 can be
configured as an SNTP server on an
Ethernet network.
Configuration & settings
Based on pre-defined libraries, individual
configurations can be created rapidly. It is
possible to modify the C264’s settings on
line, with the MiCOM S1 setting Tool (over
Ethernet). The MiCOM C264 provides two
configuration databases: one active and one
inactive for fast and secure switching in case
of system configuration changes.
Ethernet communication
The MiCOM C264 is natively equipped with
2 independent Ethernet ports to connect to
two separate LANs such as the local Station
Bus and a remote SCADA. Integrated
redundant fibre optic Ethernet switches are
optionally available, utilizing Alstom's
advanced Self Healing Ring and Dual
Homing Star protocols.
MiCOM C264
Performance and capabilities
Communication capabilities
I/O processing capabilities
Ethernet communication:
• 10/100 Base-TX, auto-crossing or 100
• Protocols include UCA2 or IEC 61850,
IEC 60870-5-104 (Multi-client) or
• Embedded Ethernet switch module with
up to six ports (permitting a compact
connection of various devices or
input/output extensions)
Including direct and IED points, the
C264 can process up to:
• 5012 Digital inputs
• 1024 Digital outputs
• 1024 Analogue inputs
• 128 Digital counters
• 128 Digital setpoints
• 4 Current Transformers (CTs)
• 5 Voltage Transformers (VTs)
• 16 IEDs per serial link
• 64 Tap position indications
Local HMI
Detachable up to 5 or 15 meters (optional)
Storage capacities
The following records are stored in nonvolatile memory:
• 2000 events, 1 ms time stamped, in the
Sequence of Event log (circular buffer)
• Up to 8 Slow or Fast Waveform Records
(SLW or FWR)
• FWR records store up to 8 analogue
measurements (32 samples per cycle)
and up to 128 digital inputs/outputs. The
total recording time is equal to 9.6s
• SWR records store up to 8 RMS
measurements (time calculation settable
from 1 cycle to 1 hour) and up to 128
digital inputs/outputs. The total
recording size is equal to 5000 values
Five waveform and disturbance files from
IED devices connected to the C264.
Alstom Grid Worldwide Contact Centre
Tel: +44 (0) 1785 250 070
Serial communication:
• Up to two SCADA or four IED links per
• SCADA protocol can be switched
between DNP3.0, IEC 60870-5-101 &
• IED Protocol can be switched between
DNP3.0, IEC 60870-5-103, MODBUS &
IEC 60870-5-101
• Transmission rate is configurable up to
38.4 kbps
Multi-bay management
Management of up to 128 bays per unit is
possible. Multi-bay panels manage
graphically up to 12 panels with a
maximum of eight animated devices per
panel on the local LCD.
l MiCOM C264
General accuracy
• 1 ms clock accuracy when synchronising
via SNTP or IRIG-B input.
• 1 ms time tagging of Digital inputs
• Digital outputs operating time, typically
<7 ms.
• Analogue inputs are accurate to 0.1% of
the full scale on the transducer.
• Programmable Scheme Logic execution
time is < 5 ms.
• The configurable automation functions on
the Programmable Logic Controller (PLC)
can be scheduled from 50 ms up to
several seconds.
Direct CT/VT accuracy
• 64 sampled values per period
• 0.2% accuracy for AI and RMS values full
• 0.5% accuracy for P, Q, S calculations
• 0.5% accuracy for Sequence components
(Id, Ii, Io, Vd, Vi, Vo) and power factor
• 0.01Hz accuracy for frequency
• 1° accuracy for Phase angles
• Calculation up to 15th harmonic.
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