GE Multilin
C70 Capacitor Bank Protection and Control System
5-69
5 SETTINGS
5.4 SYSTEM SETUP
5
Figure 5–18: DISTURBANCE DETECTOR LOGIC DIAGRAM
The disturbance detector responds to the change in currents of twice the current cut-off level. The default cut-off threshold
is 0.02 pu; thus by default the disturbance detector responds to a change of 0.04 pu. The metering sensitivity setting (
PROD-
UCT SETUP
ÖØ
DISPLAY PROPERTIES
ÖØ
CURRENT CUT-OFF LEVEL
) controls the sensitivity of the disturbance detector
accordingly.
Example use of sources:
An example of the use of sources is shown in the diagram below. A relay could have the following hardware configuration:
This configuration could be used on a two-winding transformer, with one winding connected into a breaker-and-a-half sys-
tem. The following figure shows the arrangement of sources used to provide the functions required in this application, and
the CT/VT inputs that are used to provide the data.
Figure 5–19: EXAMPLE USE OF SOURCES
INCREASING SLOT POSITION LETTER -->
CT/VT MODULE 1
CT/VT MODULE 2
CT/VT MODULE 3
CTs
CTs
VTs
827092A3.CDR
SOURCE 1
CURRENT PHASOR
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
SOURCE 2
CURRENT PHASOR
SOURCE 6
CURRENT PHASOR
ACTUAL
SETTING
SETTING
SETTING
ACTUAL
ACTUAL
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
I
_1
I
_1
I
_1
SRC 1 50DD OP
SRC 2 50DD OP
SRC 6 50DD OP
I
_2
I
_2
I
_2
I
_0
I
_0
I
_0
OR
OR
OR
Where ’ is 2 cycles old
I
Where ’ is 2 cycles old
I
Where ’ is 2 cycles old
I
I
I
_1 - _1’ >2*CUT-OFF
I
I
_1 - _1’ >2*CUT-OFF
I
I
_1 - _1’ >2*CUT-OFF
I
I
_2 - _2’ >2*CUT-OFF
I
I
_2 - _2’ >2*CUT-OFF
I
I
_2 - _2’ >2*CUT-OFF
I
I
_0 - _0’ >2*CUT-OFF
I
I
_0 - _0’ >2*CUT-OFF
I
I
_0 - _0’ >2*CUT-OFF
F 5
F 1
DSP Bank
U 1
M 1
M 1
M 5
51BF-1
51BF-2
Source 4
87T
51P
UR Relay
A
V
V
A
W
W
Var
Var
Amps
Source 1
Source 3
Volts Amps
Amps
Volts
Amps
Source 2
Summary of Contents for UR Series C70
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Page 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Page 344: ...5 220 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 586: ...D 10 C70 Capacitor Bank Protection and Control System GE Multilin D 1 OVERVIEW APPENDIXD D ...