CHAPTER 6: SETPOINTS S4 CONTROLS
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–95
BLOCK 1(3)
For details see Common setpoints
.
Upon assertion of the block selected operand, lockout will not be executed. When the
selected lockout blocking input drops out, and upon new trip, the trip and close output
relays will be locked out.
NOTE:
The lockout state can be applied to both output relays W1 BKR TRIP and W2 BKR TRIP used
for tripping the transformer breakers. If an attempt is made to close the breaker directly,
bypassing the relay outputs, (i.e. from the breaker control switch while the protective relay
applies lockout on its two TRIP outputs,) the breaker may not close, as the trip signal would
have priority over the close signal.
Figure 6-39: Lockout logic diagram
Set Dominant
SETPOINT
BLOCK 1:
Off = 0
BLOCK 2:
Off = 0
BLOCK 3:
Off = 0
OR
SETPOINT
LOCKOUT FUNCTION
Disabled = 0
Enabled
SETPOINT
ANY TRIP
AND
LOGIC OPERAND
LOCKOUT OP
LOGIC OPERAND
LOCKOUT RESET
SETPOINT
INPUT 1
SETPOINT
INPUT 10
.
.
.
OR
AND
BLOCK RESET LOCKT
SETPOINT
RESET FROM PB RESET
Disabled= 0
Enabled
PB “RESET”
LOGIC OPERAND
LOCKOUT DPO
SETPOINT
Off
RESET LOCKOUT
OR
NON-
VOLATILE
LATCH
S
R
SETPOINT
LOCKOUT SUPVSN
On
898852A1.cdr
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