GE UR Series Instruction Manual page 208

Line differential relay

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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