GE F60 Instruction Manual page 487

CHAPTER 5: SETTINGS
The scheme compares the direction to a fault at all terminals of the line. Unlike the permissive schemes, the absence of a
blocking signal permits operation of the scheme. Consequently, the scheme is biased toward dependability and requires
an "on/off" type of signaling.
The scheme generates output operands
the remote end(s). When used with telecommunications facilities, assign the output operands to operate output contacts
connected to key the transmitter at the interface.
— This setting allows any FlexLogic operand to be assigned to block the scheme. Contact inputs from
DCB3 SCHEME BLOCK
a pilot cut-out switch are used typically for this purpose.
— This setting defines a delay for the forward-looking protection elements used by the scheme
DCB3 RX CO-ORD PKP DELAY
for coordination with the blocking response from the remote end(s). In this setting, include both the response time of the
protection elements used to establish a blocking signal and the total transmission time of that signal including the relay
communications equipment interfacing and the communications channel itself.
— This setting defines a transient blocking mechanism embedded in the blocking scheme for
TRANS BLOCK PICKUP DELAY
coping with the exposure of directional overcurrent function to current reversal conditions.
The transient blocking logic applies to the send path only. Identifying the fault as a reverse fault establishes the blocking
signal. If the reverse fault condition prevails for
transient blocking timer for
TRANS BLOCK RESET DELAY
F60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
DCB3 SCHEME BLOCK:

Off
DCB3 RX CO-ORD PKP

DELAY: 0.010 s
TRANS BLOCK PICKUP

DELAY: 0.030 s
TRANS BLOCK RESET

DELAY: 0.090 s
DCB3 SCHEME SEAL-IN

DELAY: 0.010 s
DCB3 SCHME DIR FWD1:

Off
DCB3 SCHME DIR FWD2:

Off
DCB3 SCHME DIR FWD3:

Off
DCB3 SCHME DIR REV1:

Off
DCB3 SCHME DIR REV2:

Off
DCB3 SCHME DIR REV3:

Off
DCB3 FORCE TX STOP1:

Off
DCB3 FORCE TX STOP2:

Off
DCB3 RX:

Off
DCB3 SCHEME TARGET:

Self-Reset
DCB3 SCHEME EVENTS:

Disabled
(DIR BLOCK TX INIT and
DIR BLOCK TX
TRANS BLOCK PICKUP DELAY
. This allows riding through current reversal conditions. However, if
MONITORING ELEMENTS
Range: FlexLogic operand
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
STOP) that control the transmission of signals to
, the blocking operation is extended by the
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