5.5 GROUPED ELEMENTS
87L TRIP FORCE 3-φ:
This setting is used to select an element forcing 3-pole tripping if any type fault occurs when this element is active. Autore-
closure Disabled can be utilized, or Autoreclosure Counter if second trip for example is required to be a 3-pole signal, or
element representing change in the power system configuration, etc. can be considered to be applied.
87L TRIP SEAL-IN:
This setting is used to enable/disable seal-in of the trip signal by measurement of the current flowing.
87L TRIP SEAL-IN PICKUP:
This setting is used to select a pickup setting of the current seal-in function.
Figure 5–63: 87L TRIP SCHEME LOGIC
L90 Line Differential Relay
GE Power Management