CBC-8000 capacitor bank control description
CBC-8000 capacitor bank control installation and operation instructions
MN916001EN—October 2018
Eaton.com
13
Adaptive voltage sensing
Adaptive voltage sensing is a predictive algorithm that is
used to determine if a control operation will cause an OVUV
or emergency OVUV voltage condition. The average delta
voltage, which measures the change in voltage due to a
capacitor bank operation, is used along with a 10 second
average of the instantaneous line voltage to see if a control
operation will cause the voltage to be outside of the OVUV
thresholds or emergency voltage thresholds.
If the pending control operation will cause an OVUV or
emergency OVUV voltage condition and it has a priority lower
than OVUV or emergency voltage control, the control
operation is ignored. Any control operation that has a higher
priority than OVUV or emergency OVUV voltage control is
allowed.
Adaptive voltage sensing is used only if OVUV control or
emergency voltage control is enabled.
Note:
The average delta voltage is only updated when the
control believes its operation changed the capacitor
bank to the opposite state.
For example, if the capacitor bank is closed and you execute
a close command, or if the capacitor bank is open and you
execute a trip command, the control will not update the
average delta voltage reading since the control did not
change the state of the capacitor bank.
Alarming
Alarming allows the control to set alerts under specific
conditions. The alarming feature is used to indicate when an
event or condition has occurred. The control supports three
types of alarms:
•
Data
– Sets an alarm if a metering value stays outside a
threshold for a configurable period of time. High and low
thresholds may be set for each metering value. Data
alarming is available for the following conditions:
• Line voltage: high, low and THD.
• 3-phase: kvar high and low, kW high and low.
• VAR power factor: leading and lagging.
• Temperature: high and low.
• Sensor inputs 1 through 6: high and low.
• Neutral current: total, fundamental, and THD.
• Phases A through C: voltage total high and low, voltage
THD, current total, current THD, leading power factor,
lagging power factor, kW high and low, kvar high and
low.
•
Status
– Sets an alarm if a status value stays active for a
configurable period of time. Status alarms include:
• Phases A through C: power flow
• VAR power flow
•
Event
– Sets an alarm if a specific event occurs. Event
alarms that can be viewed on the front panel display
include:
• Abnormal delta voltage
• AC power present
• Bad active relay: close or trip
• Control request
• Controller mode
• Ignored control reason
• Maximum operations count
• Neutral current lockout
• Operation failed
• Override mode: CVR or SCADA
• Power fail
• Relay stuck: closed or tripped
• Relay sense failed
• Track timer: sensor input 1-6, emergency, fault current,
OVUV or var
Information about an alarm can be stored in the Sequence of
Event (SOE) log.
Note:
Alarms are not enabled by default and they must be
configured by using the front panel or with the
ProView NXG software.
Priority table control
Priority table control is used to determine if one control
method can override another control method when more
than one control method is enabled. The following table lists
the default priority level for each control method and if that
control method’s priority is configurable.
Note:
The lower the number, the higher the priority.
If more than one control method has been configured with
the same priority, the default priority level is used to
determine which control method has the highest priority.
Table 2. Priority control levels.
Default Priority
Level
Control Method
Priority Level
Configurable?
0
Manual Control
No
1
SCADA Override
Yes
2
Fault Current Control
Yes
3
Emergency OVUV
Yes
4
Time Control (when set to On/Off)
Yes
5
OVUV Control
Yes
6
VAR Control
Yes
7
Phase A Secondary Voltage
Yes
8
Phase B Secondary Voltage
Yes
Содержание COOPER POWER SERIES
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