ABB Relion 670 series - Principle of operation

7.10.2 Principle of operation
The detection of pole discrepancy can be made in two different ways. If the contact
based function is used an external logic can be made by connecting the auxiliary
contacts of the circuit breaker so that a pole discrepancy is indicated, see figure 234.
ANSI_en05000287.vsd
poleDiscrepancy Signal from C.B.
+
C.B.
52b
52b
52b
52a
52a
52a
ANSI05000287 V1 EN
Figure 234: Pole discrepancy external detection logic
This binary signal is connected to a binary input of the IED. The appearance of this
signal will start a timer that will give a trip signal after the set time delay.
There is also a possibility to connect all phase selective auxiliary contacts (phase
contact open and phase contact closed) to binary inputs of the IED, see figure
235.
poleTwoOpened from C.B.
+
C.B.
poleOneOpened from C.B.
poleThreeClosed from C.B.
poleTwoClosed from C.B.
poleOneClosed from C.B.
poleThreeOpened from C.B.
en05000288_ansi.vsd
52b
52b
52b
52a
52a
52a
ANSI05000288 V1 EN
Figure 235: Pole discrepancy signals for internal logic
Section 7 1MRK505222-UUS C
Current protection
466
Technical reference manual