than 5%. It is necessary to obtain information from the engine manufacturer and to
measure the reverse power during commissioning.
Gas turbines usually do not require reverse power protection.
Figure
illustrates the reverse power protection with underpower protection and
with overpower protection. The underpower protection gives a higher margin and
should provide better dependability. On the other hand, the risk for unwanted
operation immediately after synchronization may be higher. One should set the
underpower protection (reference angle set to 0) to trip if the active power from the
generator is less than about 2%. One should set the overpower protection (reference
angle set to 180) to trip if the power flow from the network to the generator is higher
than 1%.
Underpower protection
Overpower protection
Q
Q
P
P
Operating point
without
turbine torque
Margin
Margin
Operate
Line
Operate
Line
Operating point
without
turbine torque
IEC09000019-2-en.vsd
IEC09000019 V2 EN
Figure 69:
Reverse power protection with underpower or overpower protection
6.14.2
Directional overpower protection GOPPDOP
6.14.2.1
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
6.14.2.2
Setting guidelines
GlobalBaseSel
: Selects the global base value group used by the function to define
(
IBase
), (
UBase
) and (
SBase
).
Operation
: With the parameter
Operation
the function can be set
On
/
Off
.
1MRK 505 291-UEN A
Section 6
Current protection
145
Application manual
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