ABB REL670 2.2 IEC, Applications Manual

Page: 526 / 908

The value of k = 0.92 is recommended in generator applications as the trip delay is
normally quite long.
The calibration factors for current and voltage measurement errors are set % of
rated current/voltage:
IAmpComp5, IAmpComp30, IAmpComp100
UAmpComp5, UAmpComp30, UAmpComp100
IAngComp5, IAngComp30, IAngComp100
The angle compensation is given as difference between current and voltage angle
errors.
The values are given for operating points 5, 30 and 100% of rated current/voltage.
The values should be available from instrument transformer test protocols.
9.12 Directional overpower protection GOPPDOP
SEMOD172360-1 v4
9.12.1 Identification
SEMOD176574-2 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional overpower protection GOPPDOP
P >
2
DOCUMENT172362-IMG158942 V2 EN-US
32
9.12.2 Application
SEMOD172358-4 v2
The task of a generator in a power plant is to convert mechanical energy available
as a torque on a rotating shaft to electric energy.
Sometimes, the mechanical power from a prime mover may decrease so much that
it does not cover bearing losses and ventilation losses. Then, the synchronous
generator becomes a synchronous motor and starts to take electric power from the
rest of the power system. This operating state, where individual synchronous
machines operate as motors, implies no risk for the machine itself. If the generator
under consideration is very large and if it consumes lots of electric power, it may
be desirable to disconnect it to ease the task for the rest of the power system.
Often, the motoring condition may imply that the turbine is in a very dangerous
state. The task of the reverse power protection is to protect the turbine and not to
protect the generator itself.
Section 9
1MRK 506 369-UEN B
Current protection
520 Line distance protection REL670 2.2 IEC
Application manual