6–68 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
POS-SEQ RESTRAINT
Range: 0.000 to 0.500 in steps of 0.001
Default: 0.063
The setting controls the positive-sequence restraint. Set to 0.125. Set to zero to remove
the restraint. Set higher if large system unbalances or poor CT performance are
expected.
FORWARD ECA
Range: 0 to 90° lag in steps of 1°
Default: 75° lag
The setting selects the element characteristic angle (ECA) for the forward direction. The
element characteristic angle in the reverse direction is the angle set for the forward
direction shifted by 180°.
FORWARD LIMIT ANGLE
Range: 40 to 90° in steps of 1°
Default: 90° lag
The setting defines a symmetrical (in both directions from the ECA) limit angle for the
forward direction.
FORWARD PICKUP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 0.050 x CT
The setting defines the Pickup level for the overcurrent unit in the forward direction.
When selecting this setting it must be kept in mind that the design uses a positive-
sequence restraint technique.
REVERSE LIMIT ANGLE
Range: 40 to 90° in steps of 1°
Default: 90° lag
The setting defines a symmetrical (in both directions from the ECA) limit angle for the
reverse direction.
REVERSE PICKUP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 0.050 x CT
The setting defines the Pickup level for the overcurrent unit in the reverse direction.
When selecting the setting it must be kept in mind that the design uses a positive-
sequence restraint technique.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Self-reset, Latched, Disabled
Default: Self-reset
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