Reverse Power/Directional Overpower Protection Doppdpr - ABB RELION 630 Series Applications Manual

Section 3
REG630 variants
3.2.6.14
40
to operate like an induction machine. Two instances of underexcitation 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 underexcitation protection functions
is connected to an OR-gate to form a combined underexcitation operate and start
signal, which provides a LED indication on the LHMI. Also a separate start and
operate signal from the both instances is connected to the disturbance recorder.
The function is blocked when the generator circuit breaker is in open position or fuse
failure is detected.
GUID-571FC965-4B33-4CCA-ABA8-E8DB791314F9 V1 EN
Figure 15: Underexcitation protection

Reverse power/directional overpower protection DOPPDPR

Reverse power/directional overpower protection is used for generator protection
against the generator running like a motor. However, it can also be used to protect
against delivering an excessive power beyond the generator's capacity to the grid.
Two instances of reverse power/directional overpower 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 reverse power/directional
overpower protection functions is connected to an OR-gate to form a combined
directional overpower 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 directional overpower operate signal, and
connected to the disturbance recorder.
1MRS757582 C
REG630
Application Manual