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5 SETTINGS
•
NEG SEQ DIR OC1 FWD PICKUP: This setting defines the pickup level for the overcurrent unit in the forward direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selecting this setting it must be kept in mind that the design uses a positive-sequence restraint technique.
•
NEG SEQ DIR OC1 REV LIMIT ANGLE: This setting defines a symmetrical (in both directions from the ECA) limit
angle for the reverse direction.
•
NEG SEQ DIR OC1 REV PICKUP: This setting defines the pickup level for the overcurrent unit in the reverse direc-
tion. Upon
NEG SEQ DIR OC1 TYPE
selecting this setting it must be kept in mind that the design uses a positive-sequence restraint technique.
Figure 5–90: NEGATIVE SEQUENCE DIRECTIONAL OC1 SCHEME LOGIC
GE Multilin
selection, this pickup threshold applies to zero- or negative-sequence current. When
selection, this pickup threshold applies to zero- or negative-sequence current. When
D30 Line Distance Protection System
5.6 GROUPED ELEMENTS
5-177
5
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