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GE Multilin
L60 Line Phase Comparison System
5-183
5 SETTINGS
5.5 GROUPED ELEMENTS
5
•
NEG SEQ DIR OC1 OFFSET:
This setting specifies the offset impedance used by this protection. The primary applica-
tion for the offset impedance is to guarantee correct identification of fault direction on series compensated lines (see
the
Application of settings
chapter for information on how to calculate this setting). In regular applications, the offset
impedance ensures proper operation even if the negative-sequence voltage at the relaying point is very small. If this is
the intent, the offset impedance shall not be larger than the negative-sequence impedance of the protected circuit.
Practically, it shall be several times smaller. The offset impedance shall be entered in secondary ohms. See the
Theory
of operation
chapter for additional details.
•
NEG SEQ DIR OC1 TYPE:
This setting selects the operating mode for the overcurrent unit of the element. The
choices are “Neg Sequence” and “Zero Sequence”. In some applications it is advantageous to use a directional nega-
tive-sequence overcurrent function instead of a directional zero-sequence overcurrent function as inter-circuit mutual
effects are minimized.
•
NEG SEQ DIR OC1 POS-SEQ RESTRAINT
: This setting controls the amount of the positive-sequence restraint. Set
to 0.063 (in “Zero Sequence” mode) or 0.125 (in “Neg Sequence” mode) for backward compatibility with revisions 3.40
and earlier. Set to zero to remove the restraint. Set higher if large system unbalances or poor CT performance are
expected.
•
NEG SEQ DIR OC1 FWD ECA:
This setting select the element characteristic angle (ECA) for the forward direction.
The element characteristic angle in the reverse direction is the angle set for the forward direction shifted by 180°.
•
NEG SEQ DIR OC1 FWD LIMIT ANGLE:
This setting defines a symmetrical (in both directions from the ECA) limit
angle for the forward direction.
•
NEG SEQ DIR OC1 FWD PICKUP:
This setting defines the pickup level for the overcurrent unit in the forward direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selection, this pickup threshold applies to zero- or negative-sequence current. When
selecting this setting it must be kept in mind that the design uses a
positive-sequence restraint
technique.
•
NEG SEQ DIR OC1 REV LIMIT ANGLE:
This setting defines a symmetrical (in both directions from the ECA) limit
angle for the reverse direction.
•
NEG SEQ DIR OC1 REV PICKUP:
This setting defines the pickup level for the overcurrent unit in the reverse direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selection, this pickup threshold applies to zero- or negative-sequence current. When
selecting this setting it must be kept in mind that the design uses a
positive-sequence restraint
technique.
Figure 5–98: NEGATIVE SEQUENCE DIRECTIONAL OC1 SCHEME LOGIC
827091A5.CDR
AND
AND
AND
AND
AND
OR
OR
NOTE:
V_2 is negative-sequence voltage
I_2 is negative-sequence current
I_0 is zero-sequence current
AND
SETTING
Off = 0
Block
SETTING
= Neg Sequence
= Zero Sequence
Type
SETTINGS
Forward Pickup
RUN
( |I_0| – × |I_1| ) Pickup
K
≥
Positive-Sequence Restraint
TIMER
1.25 cycles
1.5 cycles
FLEXLOGIC OPERAND
NEG SEQ DIR OC1 FWD
SETTING
Disabled = 0
Enabled = 1
Function
SETTING
V_2
I_2
Source
I_0
RUN
( |I_2| – × |I_1| ) Pickup
K
≥
Voltage Polarization
SETTINGS
Forward ECA
RUN
Forward Limit Angle
Reverse Limit Angle
Offset
Forward
Reverse
SETTINGS
Reverse Pickup
RUN
( |I_0| – × |I_1| ) Pickup
K
≥
Pos Seq Restraint
RUN
( |I_2| – × |I_1| ) Pickup
K
≥
AND
AND
AND
FLEXLOGIC OPERAND
NEG SEQ DIR OC1 REV
Summary of Contents for UR series
Page 2: ......
Page 4: ......
Page 12: ...xii L60 Line Phase Comparison System GE Multilin TABLE OF CONTENTS ...
Page 32: ...1 20 L60 Line Phase Comparison System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 54: ...2 22 L60 Line Phase Comparison System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 438: ...7 8 L60 Line Phase Comparison System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 478: ...8 40 L60 Line Phase Comparison System GE Multilin 8 3 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Page 502: ...A 10 L60 Line Phase Comparison System GE Multilin A 1 PARAMETER LIST APPENDIXA A ...
Page 584: ...B 82 L60 Line Phase Comparison System GE Multilin B 4 MEMORY MAPPING APPENDIXB B ...
Page 622: ...D 10 L60 Line Phase Comparison System GE Multilin D 1 PROTOCOL APPENDIXD D ...
Page 634: ...E 12 L60 Line Phase Comparison System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...
Page 642: ...F 8 L60 Line Phase Comparison System GE Multilin F 3 WARRANTY APPENDIXF F ...