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GE UR Series Instruction Manual Page 207

Line differential relay.
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5 SETTINGS
c) 87L TRIP
ÖØ
PATH: SETTINGS
GROUPED ELEMENTS
87L TRIP
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The 87L Trip element must be used to secure the generation of tripping outputs. It is especially recommended for use in all
single-pole tripping applications. It provides the user with the capability of maintaining the trip signal while the fault current
is still flowing, to choose single-pole or three-pole tripping, to employ the received Direct Transfer Trip signals, to assign
supervising trip elements like 50DD, etc. The logic is used to ensure that the relay will:
trip the faulted phase for a single line to ground fault, as detected by the line differential element
trip all three phases for any internal multiphase fault
trip all three phases for a second single line to ground fault during or following a single pole trip cycle
For maximum security, it is recommended the Disturbance Detector (plus other elements if required) be assigned to see a
change in system status before a trip output is permitted. This ensures the relay will not issue a trip signal as a result of
incorrect settings, incorrect manipulations with a relay, or inter-relay communications problems (for example, extremely
noisy channels). The Open Pole Detector provides forcing of three-pole tripping for Sequential faults and Close onto Fault
if desired. The Open Pole Detector feature must be employed and adequately programmed for proper operation of this fea-
ture.
If DTT is not required to cause the 87L Trip scheme to operate, it should be disabled at the remote relay via the
CURRENT DIFFERENTIAL
NOTE
87L TRIP FUNCTION:
This setting is used to enable/disable the element.
87L TRIP SOURCE:
This setting is used to assign a source for seal-in function.
87L TRIP MODE:
This setting is used to select either three-pole or single-pole mode of operation.
87L TRIP SUPV:
This setting is used to assign a trip supervising element. FlexLogic™ operand 50DD SV is recommended (the element has
to be enabled); otherwise elements like IOC, Distance, etc. can be used.
GE Power Management
ÖØ
SUPERVISING ELEMENTS
87L TRIP FUNCTION:
Disabled
87L TRIP SOURCE:
SRC 1
87L TRIP MODE:
3-Pole
87L TRIP SUPV:
Off
87L TRIP FORCE 3-φ:
Off
87L TRIP SEAL-IN:
Disabled
87L TRIP SEAL-IN
PICKUP: 0.20 pu
87L TRIP TARGET:
Self-reset
87L TRIP EVENTS:
Disabled
ÖØ
menu (see
SETTINGS
CONTROL ELEMENTS
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
ÖØ
87L TRIP
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
Range: 3-Pole, 1-Pole
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Disabled, Enabled
Range: 0.20 to 0.80 pu in steps of 0.01
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
Ö
LINE DIFFERENTIAL ELEMENTS
5
).
5-123

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L90

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