Block Trip (BT)
The BT input is normally used in blocking schemes. Assert the BT input to block tripping by
elements set in the MTB logic mask. Assertions of this input trigger event report generation.
Direct Close (DC)
When you assert the DC input, the relay shuts the CLOSE output if no fault is detected, a trip
condition is not present, and the 52A input is not asserted. Assertions of this input do not
trigger event reports.
Circuit Breaker Status (52A)
Connect the 52A input such that when the line circuit breaker is closed, the 52A input is
asserted. The CLOSE command, recloser, and switch-onto-fault logic use the status of this
input. Assertions of this input do not trigger event reports.
External Trigger for Event Report (ET)
Assertion of the external trigger input triggers an event report. Assertion does not influence
the protective functions in any way. Applications include monitoring trips initiated by
external protective relays, backup protection, breaker failure relaying, bus differential
relaying, etc.
Output Contacts
The relay has seven output contacts: TRIP, CLOSE, ALARM, and four programmable
outputs (Al, A2, A3, and A4). You can program all outputs except the CLOSE and ALARM
outputs using the LOGIC command. Any output contacts except TRIP may be factory
configured as
"
a
"
or
"
b
"
type.
All relay contacts are rated for circuit breaker tripping duty.
TRIP Output
This output closes for a number of conditions you select. Conditions are grouped as follows:
unconditional (MTU logic mask), subject to REJO condition or PT input assertion (MPT logic
mask), subject to the absence of BT input assertion (MTB logic mask), or subject to the
breaker being open or just closed (MTO logic mask).
The TRIP output never closes for less than the TRIP Duration (TDUR) timer interval. After
this, it opens when the fault condition is gone, and both the low-set phase and residual
(50NG) and negative-sequence overcurrent (46QL) elements have dropped out.
Date Code 920508
Specifications
SEL-221F, -1 Instruction Manual
2-13
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