Underpower Protection Duppdpr - ABB RELION 630 Series Applications Manual

1MRS757582 C
3.2.6.15
REG630
Application Manual

Underpower protection DUPPDPR

Underpower protection is used for protecting the generator from very low power
output conditions. Two instances of the underpower protection functions are used
with DT characteristics. A set of three phase currents and voltages, I3P and U3P, is
connected to the inputs.
A common operate and start signal from the both underpower protection functions is
connected to an OR-gate to form a combined underpower operate and start signal
which provides a LED indication on the LHMI. Also a separate start signal from the
both instances is connected to the disturbance recorder. However, the operate signal
from the both stages is connected to the OR-gate to form a combined underpower
operate signal, and connected to the disturbance recorder.
GUID-03C15108-5D59-4E03-8E9C-5496E425B51C V1 EN
Figure 16: Directional power protection
Section 3
REG630 variants
41