Directional Overpower Protection Goppdop (32); Identification; Application - ABB REB670 Applications Manual

1MRK 505 337-UUS -
7.9
7.9.1
7.9.2
Application manual
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.

Directional overpower protection GOPPDOP (32)

Identification

Function description
Directional overpower protection

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.
IEC 61850 IEC 60617
identification identification
GOPPDOP
P >
2
DOCUMENT172362-IMG158942
V2 EN
Section 7
Current protection
ANSI/IEEE C37.2
device number
32
215