ABB Relion 615 series Applications Manual page 33

1MRS756885 A
REM615
Application Manual
The earth- fault protection is blocked when the short circuit protection
(PHIPTOC1) is started. The operation of the earth-fault protection functions is
connected to alarm LED 2.
GUID-62B6D44D-40BE-44C3-AC53-3C56199A52DC V1 EN
Figure 10: Voltage protection
For voltage protection three-phase undervoltage (PHPTUV1), positive-sequence
undervoltage (PSPTUV1) and negative-sequence overvoltage (NSPTOV1)
protection functions are offered. The three-phase undervoltage protection is
blocked during motor startup to prevent unwanted operation in case there is a short
voltage drop. Also if the fuse failure is detected, the undervoltage function is blocked.
The positive-sequence undervoltage and negative-sequence overvoltage protections
are included to protect the machine against single-phasing, excessive unbalance
between phases and abnormal phase order. The positive-sequence undervoltage and
negative-sequence overvoltage functions are blocked by default when the network
rotation direction changes (X110_BI3 is active) or if the fuse failure is detected.
Section 3
REM615 variants
27