GE UR Series L90, Инструкция по эксплуатации

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GE Multilin L90 Line Current Differential System 5-89
5 SETTINGS 5.4 SYSTEM SETUP
5
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 need to 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 L90 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
ZERO SEQ CURRENT REMOVAL
setting.
• TRANSFORMER LOCATION : This setting selects the transformer location and is applicable only if the
TRANSFORMER
CONNECTION
setting is not programmed as “None”.
– Select the “LOCAL-TAP” value if the transformer is present between the local terminal and the tap point or for two-
terminal applications.
– Select the “REM1-TAP” if the transformer is present between remote terminal 1 and the tap point.
– Select the “REM2-TAP” if the transformer is present between remote terminal 2 and the tap point.
Figure 5–22: ILLUSTRATION OF IN-ZONE TRANSFORMER FOR TWO-TERMINAL AND THREE-TERMINAL LINES
When the L90 ordered has in-zone functionality, it does not support the multi-ended fault locator.
Do not set the
IN-ZONE TRANSFORMER CONNECTION
setting to "None" at one terminal and set other terminals to a
value other than "None." 87L is blocked under these circumstances.
$&'5
NOTE