GE G60 Instruction Manual page 308

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
(
PRODUCT SETUP  DISPLAY PROPERTIES  CURRENT CUT-OFF LEVEL
accordingly.
5.5.3.4 Example for use of sources
An example of the use of sources is shown in the following figure. A relay can have the following hardware configuration:
Increasing slot position letter -->
CT/VT module 1
CTs
This configuration can be used on a two-winding transformer, with one winding connected into a breaker-and-a-half
system. 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
5-132
CT/VT module 2 CT/VT module 3
VTs not applicable
Figure 5-58: Example of use of sources
D HV AUX
SRC 2 SRC 3
F1+F5 None
None None
None None
None U1
) controls the sensitivity of the disturbance detector
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS