GE C60 Instruction Manual page 242

5.4 SYSTEM SETUP
ACTUAL
SOURCE 1
CURRENT PHASOR
_1
_2
_0
ACTUAL
SOURCE 2
CURRENT PHASOR
_1
_2
_0
ACTUAL
5
SOURCE 6
CURRENT PHASOR
_1
_2
_0
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 (

UCT SETUP DISPLAY PROPERTIES
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:
INCREASING SLOT POSITION LETTER -->
CT/VT MODULE 1
CTs
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.
5-106
SETTING
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
Where ' is 2 cycles old
SETTING
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
Where ' is 2 cycles old
SETTING
PRODUCT SETUP/DISPLAY
PROPERTIES/CURRENT
CUT-OFF LEVEL
Where ' is 2 cycles old
Figure 5–25: DISTURBANCE DETECTOR LOGIC DIAGRAM

CURRENT CUT-OFF LEVEL
CT/VT MODULE 2 CT/VT MODULE 3
VTs not applicable
C60 Breaker Protection System
_1 - _1' >2*CUT-OFF
FLEXLOGIC OPERAND
_2 - _2' >2*CUT-OFF
OR SRC 1 50DD OP
_0 - _0' >2*CUT-OFF
_1 - _1' >2*CUT-OFF FLEXLOGIC OPERAND
_2 - _2' >2*CUT-OFF SRC 2 50DD OP
OR
_0 - _0' >2*CUT-OFF
_1 - _1' >2*CUT-OFF
FLEXLOGIC OPERAND
_2 - _2' >2*CUT-OFF
OR SRC 6 50DD OP
_0 - _0' >2*CUT-OFF
) controls the sensitivity of the disturbance detector
5 SETTINGS
827092A3.CDR
PROD-
GE Multilin