GE D60 Instruction Manual page 293

5 SETTINGS
f) DIRECTIONAL COMPARISON BLOCKING
PATH: SETTINGS CONTROL ELEMENTS
BLOCKING SCHEME
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
Generally, 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.
By default this scheme uses only a forward-looking over-reaching Zone 2 distance element to identify forward faults.
Ground directional overcurrent functions available in the relay can be used in conjunction with the Zone 2 distance element
to increase the coverage for high-resistance faults. Also by default, only a reverse-looking Zone 4 distance element to iden-
tify reverse faults. Ground directional overcurrent functions available in the relay can be used in conjunction with the Zone
4 distance element for better time and sensitivity coordination.
For proper operation, the Zone 2 and 4 phase and ground distance elements must be enabled, configured and set per rules
of distance relaying. If used by this scheme, the selected ground directional overcurrent function(s) must be enabled, con-
figured and set accordingly.
In single-pole tripping applications, the scheme uses local fault type identification provided by the Phase Selector together
with information received from the remote terminal.
The scheme generates output operands (
control the transmission of signals to the remote end(s). When used with telecommunications facilities the output operands
should be assigned to operate output contacts connected to key the transmitter at the interface.
The output operand from the scheme (
output contacts in particular, in order to make the scheme fully operational. Typically, the output operand should be pro-
grammed to initiate a trip, breaker fail, and autoreclose, and drive a user-programmable LED as per user application.
GE Multilin
PILOT SCHEMES BLOCKING SCHEME
BLOCKING SCHEME
FUNCTION: Disabled
BLOCK RX CO-ORD PKP
DELAY: 0.010 s
TRANS BLOCK PICKUP
DELAY: 0.030 s
TRANS BLOCK RESET
DELAY: 0.090 s
BLOCK SCHEME SEAL-IN
DELAY: 0.010 s
GND DIR O/C FWD:
Off
GND DIR O/C REV:
Off
BLOCK SCHEME NO OF
COMM BITS: 1
BLOCK SCHEME RX1:
Off
BLOCK SCHEME RX2:
Off
BLOCK SCHEME RX3:
Off
BLOCK SCHEME RX4:
Off
BLOCK SCHEME EVENT:
Off
and
DIR BLOCK TX INIT DIR BLOCK TX1 STOP
, , and ) must be configured to interface with other relay functions,
DIR BLOCK A B C 3P
D60 Line Distance Relay
5.6 CONTROL ELEMENTS
Range: Disabled, Enabled
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: 1, 2, or 4
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
through
DIR BLOCK TX4 STOP
5
) that
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