GE Multilin g60

5-178 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
• 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 selection, this pickup threshold applies to zero- or negative-sequence current. When
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 selection, this pickup threshold applies to zero- or negative-sequence current. When
selecting this setting it must be kept in mind that the design uses a positive-sequence restraint technique.
Figure 5–88: NEGATIVE SEQUENCE DIRECTIONAL OC1 SCHEME LOGIC
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