Areva MiCOM C232 User manual

MiCOM C232
Compact Bay Unit for
Control and Monitoring
with Protection Functions
Version -302-401/402/403/404-603
Technical Manual
C232/EN M/A23
Volume 1.2

3 Operation
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C232-302-401/402/403/404-603 / C232/EN M/A23
3.18 Limit Value Monitoring (Function Group LIMIT)
Disabling or enabling limit
value monitoring Limit value monitoring can be disabled or enabled from the integrated local control panel.
Monitoring phase currents
and phase voltages The C232 offers the possibility of monitoring the following measured values to determine
if they exceed a set upper limit value or fall below a set lower limit value:
Maximum phase current
Minimum phase current
Maximum phase-to-phase voltage
Minimum phase-to-phase voltage
Maximum phase-to-ground voltage
Minimum phase-to-ground voltage
If one of the measured values exceeds or falls below one of the set upper or lower limit
values, respectively, then a signal is issued once a set time period has elapsed.
If only one voltage transformer is fitted, the C232 needs to be informed via the setting
MAIN: M.v.asg. bay/station which voltage (phase-to-ground or phase-to-phase
voltage) is connected. Depending on this setting, the triggers for the monitoring of the
phase-to-ground or phase-to-phase voltages are enabled. If three current or voltage
transformers are fitted then either the variables of one three-phase system can be
monitored or, alternatively, single-pole monitoring of the current or voltage of different
transformers is possible.

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C232-302-401/402/403/404-603 / C232/EN M/A23 3-123
3-93 Limit value monitoring of minimum and maximum phase current

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22Z5135A
3-94 Limit value monitoring of maximum and minimum phase-to-phase voltage and maximum and minimum phase-to-ground voltage

3 Operation
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C232-302-401/402/403/404-603 / C232/EN M/A23 3-125
Monitoring the neutral-
displacement voltage The neutral-displacement voltage calculated from the three phase-to-ground voltages is
monitored by two stages to determine whether it exceeds set thresholds. If the
thresholds are exceeded, a signal is issued after the set timer stage has elapsed.
3-95 Monitoring the neutral-displacement voltage

3 Operation
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Monitoring the linearized
measured DC values The direct current that is linearized by analog measured data input is monitored by two
stages to determine if it exceeds or falls below set thresholds. If it exceeds or falls below
the thresholds, a signal is issued once a set time period has elapsed.
3-96 Monitoring the linearized direct current

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3.19 Programmable Logic (Function Group LOGIC)
Programmable (or user-configurable) logic enables the user to link binary signals within
a framework of Boolean equations.
Binary signals in the C232 can be linked by logical ‘OR’ or ‘AND’ operations or by
additional ‘NOT’ operations by setting LOGIC: Fct. assignm. outp. n, where
n = 1 to 32. The Boolean equations need to be defined without the use of brackets. The
following rule applies to the operators: ‘NOT’ before ‘AND’ before ‘OR’.
A maximum of 32 elements can be processed in one Boolean equation. In addition to
the signals generated by the C232, initial conditions for governing the equations can be
set from the local control panel, through binary signal inputs, or through the serial
interfaces.
Logical operations can be controlled through the binary signal inputs in different ways.
The binary input signals LOGIC: Input n EXT (n=1to16)haveanupdating
function, whereas the input signals LOGIC: Set n EXT (n = 1 to 8) are stored. The
logic can only be controlled from the binary signal inputs that are configured for
LOGIC: Set n EXT if the corresponding reset input (LOGIC: Reset n EXT)
has also been configured for a binary signal input. If only one or neither of the two
functions is configured, then this is interpreted as ‘Logic externally set’. If the input
signals of the two binary signal inputs are implausible (such as when they both have a
logic value of ‘1’), then the last plausible state remains stored in memory.

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3-128 C232-302-401/402/403/404-603 / C232/EN M/A23
3-97 Control of logic operations via setting parameters or stored input signals
The LOGIC: Trigger n signal is a ‘triggering function’ that causes a 100 ms pulse to
be issued.

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3-98 Setting options for programmable logic (shown here for output 1)

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The output signal of one equation can be processed as the input signal for another
higher-order equation, and this makes it possible to have a sequence of interlinked
Boolean equations. The equations are processed in the sequence defined by the order
of each equation so that the end result of a sequence of interlinked Boolean equations is
given by the highest-order equation.
The output signal of each equation is fed to a separate timer stage that has two timer
elements and a choice of operating modes. This offers the possibility of assigning a
freely configurable time characteristic to the output signal of each Boolean equation. In
the Minimum time operating mode, the setting of timer stage t2 has no effect. Figures
3-99 to 3-103 show the time characteristics for the various timer stage operating modes.
Note: If the unit is set to “off-line“, the equations are not processed and all outputs are
set to a logic value of '0'.
3-99 Operating mode 1: Operate/release delay

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3-100 Operating mode 2: Operate-delay/pulse duration
3-101 Operating mode 3: Operate/release delay, retriggerable

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3-132 C232-302-401/402/403/404-603 / C232/EN M/A23
3-102 Operating mode 4: Operate-delay/pulse duration, retriggerable
3-103 Operating mode 5: Minimum time
Through appropriate configuration, it is possible to assign the function of a binary input
signal to each output of a logic operation. The output of the logic operation then has the
same effect as if the binary signal input to which this function has been assigned were
triggered.

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3-104 Signal assignment to outputs of Boolean equations

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3.20 Control and Monitoring of Switchgear Units (Function Groups DEV01 to
DEV10)
The C232 is designed for the control of up to 6 switchgear units. The topology of a
switchbay with its switchgear units is defined by the bay type.
Defining the bay type With the selection of the bay type, the user defines the following properties:
Manually operated switchgear units with position signals to be processed
Switchgear units to be controlled and signaled by the C232
The bay interlock equations for the Open / Close control of the switchgear units, for
operation with or without station interlock
Binary inputs required for switchgear units with direct motor control
Outputs required for switchgear units with direct motor control
When the bay type is selected, the binary inputs for the switchgear position signals and
the output relays for the control commands are configured automatically if
MAIN: Auto-assignment I/O issettoYes. If set to No, the user will need to carry
out this configuration. The list of bay types in the Appendix shows which binary inputs
and output relays have been assigned signals or commands for control of the switchgear
units in the case of automatic configuration.
The setting options for the C232 and the different possibilities for integrating a
switchgear unit into the functional sequence of the C232 (processing position signals
only or controlling and signaling) will be explained below, using one switchgear unit as
an example. Function group DEV01 will be used throughout in this example.
If a signal is identified in the function diagrams by function group “COMM1:” and a blank
address [--- ---], this means that it is a signal to or from the communication interface and
that no address has been assigned to it. The signals listed in the function plans as
‘signal 1’ to ‘signal n’ are specified in the configuration tables of the Address List.

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3.20.1 Processing of Position Signals for Manually Operated Switchgear
The position signals ‘Open’ and ‘Closed’ are assigned to binary signal inputs. The
signals conditioned by debouncing and chatter suppression (see: ‘Main Functions of the
C232’) are used for further processing. If no logic value of '1' is present at any of the two
binary signal inputs, the running time monitoring is started. For the duration of the
running time or until the switching device is back to a defined position - either ‘Open’ or
‘Closed’ - the signal ‘Intermediate position’ is issued.
If DEV01: Interm. pos. suppr. issettoYes, the previous switching device position
will continue to be signaled while the switching device is moving. Once the switching
device has reached its new position, the updated position is signaled.
The signal ‘Faulty position’ is issued if the switching device does not return to the ’Open’
or ‘Closed’ position once the running time monitoring has elapsed. If DEV01:
Stat.ind.interm.pos. issettoyes, a delay time of 5 s is started. If there is no position
signal once the timer stage has elapsed, the state actually present at the binary inputs
will be signaled.
Switch truck For switchgear units mounted on switch trucks with switch truck plugs, there is the
possibility of configuring a single-pole signal as status signal from the switch truck plug.
If such a configuration has been assigned, the position signal of the associated switching
device is set to ‘Open’ while the input has a logic value of '1'.

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3-105 Processing of position signals for manually operated switchgear

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3.20.2 Functional Sequence for Controllable Switchgear Units
Local or remote control of
external devices Switchgear units can be controlled remotely or locally. The Selection of the Control
Point is described in the section entitled “Configuration of the Bay Panel and of the
Measured Value Panels; Selection of the Control Point (Function Group LOC)”. Usually,
remote control is effected via the communication interface, local control via the local
control panel keys. Moreover, the switching devices can be controlled remotely via
binary inputs configured appropriately (configuration via DEVxx: Inp .asg. el. ctrl.
open or DEVxx: Inp. asg. el. ctr. close). Thesetting MAIN: Electrical
control determines whether the inputs function as remote or local control points.
Selection of the switching
device to be controlled and
generation of the switching
request The switchgear unit to be controlled is selected and the switching command is sent to
the selected switchgear unit. This can be effected via the local control panel using the
selection key and pressing the ‘Open’ or ‘Close’ key to generate the switching request.
For control via the binary inputs, the appropriate control inputs need to be configured for
the switchgear units to be controlled. For control via the serial interface, the control
command ‘Open’ or ‘Close’ also addresses the switchgear unit to be controlled.

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3-106 Generating the switching request

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Enabling of the switching
commands Before a switching command is executed, the C232 checks the interlocking equations
defined in the interlocking logic to determine whether the switching command is
permissible. Bay interlock equations for operation with or without station interlock can be
defined. The assignment of the output of the interlocking logic to a switching command
determines the interlocking equation that defines, for example, the conditions for the
open command for operation without station interlock.
3-107 Assignment of the equations of the interlocking logic to the switching commands; enabling of the switching commands by the bay interlock

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3-140 C232-302-401/402/403/404-603 / C232/EN M/A23
Bay interlock for operation
with station interlock For the station interlock equations to be interrogated, there needs to be communication
with substation control level. If the C232 detects a communication error or if there is no
communication interface, there will be an automatic switch to bay interlock without
station interlock.
If there is to be a check on the bay and station interlock, the bay interlock will be
checked first. If bay interlocking issues a switching enable, a switching request will be
sent to substation control level. At substation control level, there will then be a check as
to whether - taking into account the station interlock equations - it is permissible to
switch. If substation control level also issues an enabling command, the switching
operation is carried out provided that the enable from the bay interlock is still present.
Optionally, the ‘Open’ or ‘Close’ switching operation can be carried out without checking
the station interlock equations. In this case, the bay interlock equations defined for
operation without station interlock equations will be consulted.
3-108 Enabling of the switching commands by the station interlock
Linking the protection
commands to the switching
commands