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Configuration and Settings – 3
3–31
Save
Cancel
#1
Pickup:
Delay:
(47) Negative Sequence Overvoltage
X
4.0 %
1 Cycle
100.0 %
8160 Cycles
Outputs
Blocking Inputs
2
1
2
1
FL
#2
Pickup:
Delay:
4.0 %
1 Cycle
100.0 %
8160 Cycles
Outputs
Blocking Inputs
2
1
2
1
FL
Figure 3-36
M-3810A IPScom
®
for Windows™ (47) Negative Sequence
Overvoltage Setup Dialog Screen
Path
: Relay/Setup/Setpoints/47 Negative Sequence Overvoltage
COMMAND BUTTONS
Save
Saves all entered information to the control.
Cancel
Returns you to the previous window; any changes to displayed information are lost.
■
NOTE
: Pickup percentage is based on Nominal Voltage.
47 Negative Sequence Overvoltage (Voltage
Unbalance)
The Negative Sequence Overvoltage function (47)
provides protection for voltage unbalance and reverse
phase sequence.
Voltage unbalance can occur from blown fuses on
transformers, open conductors, load unbalance and
other single-phase events. Phase reversal may
occur when lines are repaired and conductors are
inadvertently swapped.
A pickup setting in the range of 8 to 25% can
reliably detect open phases and reverse phase
sequence.
A minimum time delay of 6 to 10 cycles will prevent
mis-operation during switching transients.
Summary of Contents for Syncrocloser M-3410A
Page 1: ...Instruction Book M 3410A Intertie Generator Protection Relay ...
Page 39: ...xiv M 3410A Instruction Book This Page Left Intentionally Blank ...
Page 71: ...M 3410A Instruction Book 2 28 This Page Left Intentionally Blank ...
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Page 161: ...1 3 A B C M 3410A Instruction Book 4 40 This Page Left Intentionally Blank ...
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