Tripping Logic Circuits - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00
TRIP-TRTP
TRIP-EXTL1
TRIP-PSL1
TRIP-EXTL2
TRIP-PSL2
TRIP-EXTL3
TRIP-PSL3
TRIP-TRSPE
TRIP-TRSPZ

2.3 Tripping logic circuits

Tripping logic
Signal
L1TRIP
L2TRIP
L3TRIP
External tripping signals can also cause a single-phase tripping without
any restriction.
&
&
&
Loop delay
1
&
&
1
Fig. 2
You can configure the TRIP-TRSPE signal to the output signal of the EF-
--TREF overcurrent, earth-fault, protection function (directional and non-
directional). This enables single-phase tripping when the faulty phase is
detected by some other phase-selection element such as the phase selec-
tion in distance protection.
Fig. 3 shows a simplified illustration of the tripping logic circuits. The
TRIP-BLOCK signal might block the operation of the complete tripping
unit. In a similar way, an external TRIP-EXTTRIP signal can cause
instantaneous three-phase tripping if the function has not been blocked by
external signal or the terminal has been switched to operational testing
mode with activated blocking. A functional TRIP-PTPTRIP input signal
prepares the three-phase tripping conditions for any of the tripping signals
arriving from the front logics. Timers, delayed for 2 seconds at drop-out,
assure correct three-phase tripping for evolving faults.
To phase...
L1
L2
L3
Loop delay
1
&
50ms
t
Single-phase front logic—simplified logic diagram
1MRK 580 120-XEN
1
L1TRIP
1
1
L2TRIP
1
1
L3TRIP
1
&
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To
Fig 3
(X80120-2)