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)
SEMOD172360-1 v4
9.11.1
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
9.11.2
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.
1MRK 502 071-UUS A
Section 9
Current protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
411
Application manual
Summary of Contents for RELION 670 SERIES REG670
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