ABB RELION 615 Series Applications Manual page 118

Section 3
REG615 standard configurations
112
SEQSPVC1_FUSEF_U
SEQSPVC1_FUSEF_U
DOPPDPR1_OPERATE
DOPPDPR2_OPERATE
GUID-3446AB4B-0D02-4A64-A5DE-C53F29930B2C V2 EN
Figure 150: Directional overpower protection function
Two instances of underpower protection DUPPDPR are provided. Normally these are
used in coordination with reverse active power protection.
SEQSPVC1_FUSEF_U
CB_NOT_CLOSED
SEQSPVC1_FUSEF_U
CB_NOT_CLOSED
DUPPDPR1_OPERATE
DUPPDPR2_OPERATE
GUID-8E7C906F-A069-46E9-AC86-DAF689BC8F03 V2 EN
Figure 151: Directional underpower protection function
On losing excitation, generator may over speed and operate as an induction generator
taking reactive power from the system which may reduce system voltages. Three-
phase underexcitation protection UEXPDIS is provided to detect such conditions.
Directional underpower protection is disabled when the generator circuit breaker is in
open position.
SEQSPVC1_FUSEF_U
X130_BI4_FIELD_EXCITATION_OPEN
GUID-CA7946F0-0588-4A56-9310-F0024467EC40 V2 EN
Figure 152: Underexcitation protection function
DOPPDPR1
BLOCK OPERATE
START
DOPPDPR2
BLOCK OPERATE
START
OR6
B1 O
B2
B3
B4
B5
B6
DUPPDPR1
BLOCK OPERATE
DISABLE START
DUPPDPR2
BLOCK OPERATE
DISABLE START
OR
B1 O
B2
UEXPDIS1
BLOCK OPERATE
EXT_LOS_DET START
1MRS758272 B
DOPPDPR1_OPERATE
DOPPDPR1_START
DOPPDPR2_OPERATE
DOPPDPR2_START
DOPPDPR_OPERATE
DUPPDPR1_OPERATE
DUPPDPR1_START
DUPPDPR2_OPERATE
DUPPDPR2_START
DUPPDPR_OPERATE
UEXPDIS1_OPERATE
UEXPDIS1_START
REG615
Application Manual