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M-6280A Instruction Book
4–92
Delta Voltage Overview
Delta Voltage is a calculated average of the
measured value of the change in voltage just
before a Capacitor Bank operation and 1 second
after the Close/Open Pulse Duration setting in the
control (1.1 second for solenoid if the setting is at
default, and 8 seconds for motor). Any one of the
following conditions will result in the measured delta
voltage not being used in the delta voltage average
calculation:
• The measured delta voltage is outside the
0.8 to 30 Volt range
• Capacitor Bank operation occurred as
a result of exceeding the Control Mode
Maximum or Minimum Voltage limits
• Capacitor Bank operation occurred as a
result of exceeding Remote Control Mode
Overvoltage or Undervoltage limits
• Any retry operation (Bank/Switch
Failed Level 2 Prior Operation Neutral
Overcurrent or Bank Status)
• Reverse operation as a result of Bank/
Switch Failed Level 2 Prior Operation
Neutral Overcurrent
Delta Voltage Alarm
The Delta Voltage Alarm is activated when the Delta
Voltage value exceeds the bandwidth established
by the Open “Voltage/Overvoltage” setting, and
the Close “Voltage/Undervoltage” setting. The
alarm activates the Programmable Alarm Relay
(cannot be deselected). The alarm is displayed
on the Metering and Status screen (Figure 3-29),
the HMI as a cycling alarm message, and from
the HMI Monitor/Alarm Status menu. The Delta
Voltage alarm also can be selected as a triggering
event for the Oscillograph and Sequence of Events
Recorders. The Oscillograph Recorder, Sequence
of Events Recorder and Data Logging include the
Delta Voltage parameter. A DNP Binary Status Point
named “Delta Voltage Alarm” is also included.
The Delta Voltage Alarm can be reset from the
CapTalk Programmable Alarm Relay settings
screen Figure 4-40, and from the HMI Configuration/
Programmable Alarm menu. When the alarm is reset
from the Programmable Alarm Relay settings screen,
CapTalk will momentarily display “Delta Voltage will
be reset to ½ the Bandwidth to clear this alarm”.
When the alarm is reset from the HMI, the control
will display “Resetting Delta V to 1/2 Bandwidth”.
Delta Voltage in Automatic Classic Voltage
Control Mode
The Delta Voltage value is continuously compared
to the difference between the Control Open Voltage
setting and the Control Close Voltage setting
(termed bandwidth for this description). If the
Delta Voltage value is greater than or equal to the
bandwidth, then control operation is blocked (Open
or Close) and will initiate the following actions:
1.
Activate the Delta Voltage Alarm
2.
Start an internal 48 hour timer (stored in
non-volatile memory)
3. When the internal timer reaches 48
hours, the Delta Voltage will be set to ½
the bandwidth
4.
The Delta Voltage Alarm is reset
5.
Control operation resumes
Delta Voltage in Remote Control Mode with
Remote Control Mode Limits Enabled
When the control is in the Remote Control Mode
with Remote Control Mode Limits enabled, the
control continuously compares the Delta Voltage
value to the difference between the Overvoltage
and Undervoltage limits (termed bandwidth for this
description). If the Delta Voltage value is greater
than or equal to the bandwidth, then control
operation is blocked (Open or Close) and will initiate
the following actions:
1.
Activate the Delta Voltage Alarm
2.
Start an internal 48 hour timer (stored in
non-volatile memory).
3. When the internal timer reaches 48
hours, the Delta Voltage will be set to ½
the bandwidth
4.
The Delta Voltage Alarm is reset.
5.
Control operation resumes
Summary of Contents for M-6280A
Page 1: ...Instruction Book M 6280A Digital Capacitor Bank Control ...
Page 33: ...This Page Left Intentionally Blank ...
Page 53: ...xx M 6280A Instruction Book This Page Left Intentionally Blank ...
Page 56: ...Introduction 1 1 3 Figure 1 1 Functional Diagram ...
Page 59: ...1 6 M 6280A Instruction Book This Page Left Intentionally Blank ...
Page 66: ...2 7 Operation 2 Figure 2 1 M 6280A Front Panel ...
Page 137: ...3 14 M 6280A Instruction Book Figure 3 13 CapTalk Main Screen Connected Mode ...
Page 172: ...3 49 CapTalk 3 Figure 3 67 CBEMA Settings Dialog Screen ...
Page 179: ...3 56 M 6280A Instruction Book Figure 3 87 M 6280A DNP Configurator Dialog Screen ...
Page 184: ...3 61 CapTalk 3 Figure 3 98 CapPlot Window with Data Logging Data Example ...
Page 185: ...3 62 M 6280A Instruction Book Figure 3 99 CapPlot Window with Oscillograph Data Example ...
Page 191: ...3 68 M 6280A Instruction Book This Page Left Intentionally Blank ...
Page 313: ...M 6280A Instruction Book 4 122 Figure 4 63 Setpoints Dialog Screen VAr Control ...
Page 314: ...Configuration 4 4 123 Figure 4 64 Setpoints Dialog Screen Current Control ...
Page 451: ...D 4 M 6280 Instruction Book This Page Left Intentionally Blank ...