ABB RET630 - Protection Function Overview of Preconfiguration a

windings. Earth-fault protection based on the
measured or calculated residual overvoltage
is also available.
To detect reversed power flow or circulating
currents at parallel power transformers
RET630 also offers directional overcurrent
protection. Further, overfrequency and
underfrequency protection, overvoltage and
undervoltage protection and circuit-breaker
failure protection are provided.
GUID-FD724103-823D-4443-ACAE-412BB7906240 V1 EN
Figure 2. Protection function overview of preconfiguration A
Transformer Protection and Control 1MRS756788 A
RET630
Product version: 1.0 Issued: 15.09.2009
ABB 9