GE L30 Instruction Manual page 234

5.4 SYSTEM SETUP
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
Y LV
SRC 1
Phase CT M1
Ground CT M1
Phase VT M5
Aux VT None
5-94

CURRENT CUT-OFF LEVEL
CT/VT MODULE 2 CT/VT MODULE 3
VTs not applicable
Figure 5–19: EXAMPLE USE OF SOURCES
D HV AUX
SRC 2 SRC 3
F1+F5 None
None None
None None
None U1
L30 Line Current Differential System
) controls the sensitivity of the disturbance detector
5 SETTINGS
PROD-
GE Multilin