ABB Relion 670 Series RES670, Technical Manual

Page: 264 / 888

8.6.8 Technical data
Table 140: GUPPDUP (37) technical data
Function Range or value Accuracy
Power level
for Step 1 and Step 2
(0.0–500.0)% of
SBase
±1.0% of S
n
at S ≤ S
n
±1.0% of S at S > S
n
where
S
r
= 1,732*V
n
*I
n
Characteristic angle
for Step 1 and Step 2
(-180.0–180.0) degrees ±2.0 degrees
Independent time delay to trip for
Step 1 and Step 2 at 2 to 0.5 x S
n
and
k=0.000
(0.01-6000.00) s ±0.2% or ±40 ms whichever is
greater
8.7 Directional overpower protection GOPPDOP (32)
8.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional overpower protection GOPPDOP
P >
2
DOCUMENT172362-IMG158942
V2 EN
32
8.7.2 Functionality
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 8
1MRK 511 365-UUS A
Current protection
258 Phasor measurement unit RES670 2.1 ANSI
Technical manual