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5.4 SYSTEM SETUP
5
b) IN-ZONE TRANSFORMER
PATH: SETTINGS
SYSTEM SETUP
IN-ZONE
TRANSFORMER
The in-zone transformer settings described below ensure that the 87L element correctly applies magnitude and phase
compensation for the in-zone transformer. To accommodate for the difference in CT ratios at line terminals, the
GROUPED ELEMENTS
setting should be used. It is important to properly program the in-zone transformer setting for all terminals to
DIFF CT TAP
ensure correct 87L performance.
•
IN-ZONE TRANSFORMER CONNECTION: This setting is used to indicate the presence and group connection of the
in-zone transformer. The winding angle selection specifies the phase shift of the remote terminal side winding with
5-88
Figure 5–21: CHANNEL ASYMMETRY COMPENSATION LOGIC
87L POWER SYSTEM
IN-ZONE TRANSFORMER
CONNECTION: None
TRANSFORMER LOCATION:
MESSAGE
LOCAL-TAP
SETTING GROUP 1(6)
LINE DIFFERENTIAL ELEMENTS
L90 Line Current Differential System
IN-ZONE TRANSFORMER
Range: None, 0 to 330° lag in steps of 30°
Range: LOCAL-TAP, REM1-TAP, REM2-TAP
CURRENT DIFFERENTIAL
5 SETTINGS
SETTINGS
CURRENT
GE Multilin
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