5-264 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 5: SETTINGS
5
The capacitor control element gathers on/off commands from various sources and executes them, while maintaining
remote/local and auto/manual control rights. Local control refers to control from the front panel of the relay. Remote
control refers to control via communications from outside of the relay, an on-site interface, and/or from an off-site control
center. There is flexibility to support other configurations.
This element provides a user-programmable time delay that inhibits closing after the bank has been switched out of
service until the bank has had time to discharge any trapped charge. If the capacitor were to be closed with trapped
charge of opposite polarity from the system voltage at that instant, larger than normal transients would occur. A
FlexAnalog value is available to inform the time remaining before the next permissible close operation.
Seal-in is provided to stretch short input commands to lengths suitable for breaker control. An interlock prevents
simultaneous trip and close output, which can result in breaker pumping. To prevent a continuous close input from causing
reclosing of the breaker following a trip command, the interlock is sealed-in for the duration of any close input.
A provision is provided to force the auto/manual mode to manual on protection operation. This prevents the capacitor
automatic switching scheme from attempting to close a faulted capacitor. A setting controls the automatic switchover to
manual upon the protection trip.
The following settings are available for each capacitor control element.
CAP 1 CTRL FUNCTION — This setting is used to enable the element. When disabled, the remote/local latch is forced to local,
the auto/manual latch is forced to manual, the trip and close command outputs are forced off, and their seal-in latches
and timers are reset.
CAP 1 SET REMOTE 1(2) — Sets one or two FlexLogic operands to select the remote mode. It is expected that one of these
settings is programmed to a pushbutton “on” operand. This allows a local operator to hand over control to remote
operators. Where appropriate, the other one of these settings can be set to a virtual input. This allows remote operators to
grant themselves control rights.
CAP 1 SET LOCAL 1(2) — Similar to previous setting, but selects local mode.
CAP 1 RMT CTRL EN — Selects a FlexLogic operand to enable remote auto/manual and open/close control. It is expected to
be set to CAP 1 IN REMOTE to obtain the baseline functionality, but variations via FlexLogic are possible. For example, if it is
required that remote control is always available, this setting can be set to “On.”
CAP 1 LCL CTRL EN — Similar to previous setting, but enables local controls. Expected to be set to CAP 1 IN LOCAL.
CAP 1 RMT SET AUTO — Selects a FlexLogic operand that selects auto mode when remote control is enabled. It is expected to
be set to a virtual input to enables HMI/SCADA access via one of the supported protocols.
CAP 1 LCL SET AUTO — Similar to previous setting, but expected to be set to a pushbutton “on” operand.
CAP 1 RMT SET MAN — Similar to the CAP RMT SET AUTO setting, but selects manual mode.
CAP 1 BKR CLSD 52a:
Off
Range: FlexLogic operand
CAP 1 DISCHARGE
DELAY: 300 s
Range: 0 to 3600 s in steps of 1
CAP 1 CLOSE SEAL-IN
DELAY: 0.400 s
Range: 0.000 to 60.000 s in steps of 0.001
CAP 1 BKR CLOSE BLK:
Off
Range: FlexLogic operand
CAP 1 CLS OVERRIDE:
Off
Range: FlexLogic operand
CAP 1 TARGETS:
Disabled
Range: Self-reset, Latched, Disabled
CAP 1 EVENTS:
Disabled
Range: Disabled, Enabled
The C70 is provided with optional capacity bank control. This feature is specified as an option at the time of
ordering. See the Order Codes section in chapter 2 for details.
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