Breakers - GE L30 Instruction Manual

SYSTEM SETUP
The L30 is provided with this optional feature, specified as an option at the time of ordering. Using the order
code for your device, see the order codes in chapter 2 for details.
These settings 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, use the
SETTING GROUP 1(6)  LINE DIFFERENTIAL ELEMENTS  CURRENT DIFFERENTIAL  CURRENT DIFF CT TAP
to properly program the in-zone transformer setting for all terminals to ensure correct 87L performance.
IN-ZONE TRANSFORMER CONNECTION
transformer. The winding angle selection specifies the phase shift of the remote terminal side winding with respect to the
local terminal side winding. For example, for the Dy1 group where the delta winding is connected to the local terminal side,
and wye winding is connected to the remote terminal side, you select "30° lag" for the local terminal side. (At the remote
terminal relay, select "330° lag" for this transformer group connection.) If there is no in-zone transformer connected, then
program this setting as "None" (note that the "0° lag" value does not correspond to "None"). Only one in-zone transformer
is allowed for both two-terminal and three-terminal applications. Enabling in-zone transformer functionality forces the L30
to automatically remove the zero-sequence component from all terminals currents. It also disables ground differential
87LG functionality and zero-sequence current removal functionality defined by the
Do not set the
IN-ZONE TRANSFORMER CONNECTION
other than "None." 87L is blocked under these circumstances.
TRANSFORMER LOCATION
setting is other than "None."
CONNECTION
5
Select the "LOCAL-TAP" value if the transformer is present between the local terminal and the tap point or for two-terminal
applications.
Select "REM1-TAP" if the transformer is present between remote terminal 1 and the tap point.
Select "REM2-TAP" if the transformer is present between remote terminal 2 and the tap point.
Figure 5-55: Illustration of in-zone transformer for two-terminal and three-terminal lines

5.5.5 Breakers

SETTINGS  SYSTEM SETUP  BREAKERS  BREAKER 1(2)
 BREAKER 1

5-130
TRANSFORMER LOCATION:

LOCAL-TAP
— This setting indicates the presence and group connection of the in-zone
setting to "None" at one terminal and set other terminals to a value
— This setting selects the transformer location and applies only when the
BREAKER 1

FUNCTION: Disabled
BREAKER1 PUSH BUTTON

CONTROL: Disabled
Range: LOCAL-TAP, REM1-TAP, REM2-TAP
SETTINGS  GROUPED ELEMENTS 
ZERO SEQ CURRENT REMOVAL
Range: Disabled, Enabled
Range: Disabled, Enabled
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
setting. It is important
setting.
IN-ZONE TRANSFORMER