GE D90 Plus Instruction Manual page 157

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
by an undervoltage condition, which in turn is controlled by the
with a 10 ms coordination timer. Configure the
trip action if the intent is apply zone 1 extension.
The zone 1 extension philosophy used normally operates from an under-reaching zone,
and uses an over-reaching distance zone when reclosing the line with the other line end
open. The
Autoreclose Accelerate
functionality if external autoreclosure is employed. Another zone 1 extension approach is
to permanently apply an overreaching zone, and reduce the reach when reclosing. This
philosophy can be programmed via the autoreclose scheme.
Select the Settings > Protection > Elements > Group 1 > Line Pickup menu item to open
the line pickup configuration window. There is one line pickup element for each setting
group.
Figure 113: Line pickup configuration window
The following settings are available.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disabled the line pickup feature.
Signal Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: LINE (SRC 1)
This setting selects the signal source for line pickup protection.
Phase IOC Line Pickup
Range: 0.000 to 30.000 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the level of line current required to declare a line pickup operation
when the line is re-energized.
Undervoltage Pickup
Range: 0.000 to 3.000 pu in steps of 0.001
Default: 0.700 pu
This setting specifies the level of line voltage required to declare that the line is de-
energized, thereby arming the line pickup protection. The overcurrent and distance
elements are supervised by the arming logic.
GROUPED PROTECTION ELEMENTS
LINE PICKUP RCL TRIP
setting is provided to achieve zone 1 extension
operand
VT FUSE FAIL OP
operand to perform a
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