ABB RELION REB500 Technical Manual page 90

Section 5
Bay protection functions
Signal
BIT_HF_ON
HF_SEND
HF_BOOST
Tripping logic
The main purpose of the tripping logic is coordination of single and three-phase tripping of
the circuit-breaker (heavy-duty tripping relay outputs). It also provides additional starting and
tripping signals.
Single or three-phase tripping is initiated when the following conditions are simultaneously
fulfilled:
• Starter picked up, that is, underimpedance start or overcurrent start or undervoltage start
(Weak) [UWEAK_L1, L2, L3] from the POTT or PUTT receive logic.
• Trip by the relays own measuring unit, the back-up overcurrent unit, the short-zone (STUB)
logic, the switch-onto-fault (SOFT) logic, the zone extension logic or by the PUTT, POTT or
BLOCK OR receive logic.
• No blocking signal is being generated by the enable and blocking logic. (this signal cannot
block tripping by the back-up overcurrent unit or short-zone logic).
Only single-phase tripping will take place when:
Trip Mode is set to 1 Ph Trip
•
• The starter of just one phase has picked up
• None of the conditions for three-phase tripping is fulfilled
Any of the following conditions results in three-phase tripping:
Trip Mode set to 3 Ph Trip .
•
• The starters of more than one phase have picked up.
• The autoreclosure function commands the distance function to trip all three-phases.
• Either the back-up overcurrent function or the short-zone logic has tripped.
• Operation of the switch-onto-fault logic
• A second trip occurs (for example, evolving fault), for example, during the autoreclosure
dead time.
• The parameter
(autoreclosure in the 2nd zone as well).
84
In Out
X
X
X
Trip Mode is set to 3 Ph Trip Del 3 and the zone 3 time has expired
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Source
Binary output: Com Send
Binary output: Com Boost
Bay protection functions REB500
1MRK 505 406-UEN B
Drain
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Technical manual