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:
IMagComp5, IMagComp30, IMagComp100
VMagComp5, VMagComp30, VMagComp100
IMagComp5, IMagComp30, IMagComp100
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.
9.11 Directional overpower protection GOPPDOP (32)
9.11.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional overpower protection GOPPDOP
DOCUMENT172362-IMG158942
V2 EN
32
9.11.2 Application
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.
Section 9 1MRK 506 369-UUS -
Current protection
554 Line distance protection REL670 2.2 ANSI
Application manual
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