5-122
L60 Line Phase Comparison System
GE Multilin
5.5 GROUPED ELEMENTS
5 SETTINGS
5
Figure 5–52: CHARGING CURRENT COMPENSATION CONFIGURATIONS
•
CHARGE COMPENST BLOCK
: This setting selects an input to block charging current compensation. This input is
typically the VT fuse fail element of the source, where the three-phase VT is configured with this setting to block com-
pensation. Blocking charging current compensation at one end of the line does not block charging current compensa-
tion on the other end. However, even with compensation operating at one end ½ (or 1/3) of the charging current is still
removed from the net phase comparison current. Alternatively, the customer may choose to switch to another setting
group with more conservative phase comparison settings during a VT fuse fail condition.
•
POSITIVE and ZERO SEQUENCE CAPACITIVE REACTANCE:
The values of positive and zero sequence capacitive
reactance of the protected line are required for charging current compensation calculations. The line capacitive reac-
tance values should be entered in
primary kilo-ohms
for the total line length. Details of the charging current compen-
sation algorithm can be found in Chapter 8:
Theory of operation
.
If shunt reactors are also installed on the line, the resulting value entered in the
POS SEQ CAPACITIVE REACTANCE
and
ZERO SEQ CAPACITIVE REACTANCE
settings should be calculated as follows:
1.
No shunt reactors on the line or reactor current is subtracted from the line current, forcing the L60 to measure the
uncompensated by shunt reactors load/fault current plus the full charging current.
(EQ 5.7)
2.
Three-reactor arrangement:
three identical line reactors (
X
react
) solidly connected phase to ground.
(EQ 5.8)
3.
Four-reactor arrangement:
three identical line reactors (
X
react
) wye-connected with the fourth reactor (
X
react_n
)
connected between reactor-bank neutral and the ground.
(EQ 5.9)
X
1line_capac
= the total line positive-sequence capacitive reactance
X
0line_capac
= the total line zero-sequence capacitive reactance
X
react
= the total reactor inductive reactance per phase. If identical reactors are installed at both ends of the line,
the inductive reactance is divided by 2 (or 3 for a three-terminal line) before inserting in the above equa-
tions. If the reactors installed at both ends of the line are different, the following equations apply:
1.
For a two-terminal line:
2.
For a three-terminal line:
X
react_n
=
the total neutral reactor inductive reactance. If identical reactors are installed at both ends of the line,
the inductive reactance is divided by 2 (or 3 for a three-terminal line) before inserting in the above
equations. If the reactors installed at both ends of the line are different, the following equations apply:
Possible 3-Reactor
arrangement
Line Capacitive Reactance
Xreact
Xreact
Xreact_n
X1line_capac
X0line_capac
Possible 4-Reactor
arrangement
A B C
A B C
831731A3.CDR
X
C
1
X
1line_capac
=
,
X
C
0
X
0line_capac
=
X
C
1
X
1line_capac
X
react
⋅
X
react
X
1line_capac
–
------------------------------------------------
=
,
X
C
0
X
0line_capac
X
react
⋅
X
react
X
0line_capac
–
------------------------------------------------
=
X
C
1
X
1line_capac
X
react
⋅
X
react
X
1line_capac
–
------------------------------------------------
=
,
X
C
0
X
0line_capac
X
react
3
+
X
react_n
(
)
⋅
X
react
3
+
X
react_n
X
0line_capac
–
---------------------------------------------------------------------------------
=
X
react
1
1
X
react_terminal1
-----------------------------------
1
X
react_terminal2
-----------------------------------
+
⎝
⎠
⎛
⎞
⁄
=
X
react
1
1
X
react_terminal1
-----------------------------------
1
X
react_terminal2
-----------------------------------
1
X
react_terminal3
-----------------------------------
+
+
⎝
⎠
⎛
⎞
⁄
=
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 ...