ABB RELION RET670 Applications Manual page 877

1MRK 504 163-UUS A
Transformer protection RET670 2.2 ANSI
Application manual
Table 66: General settings parameters for the Measurement function
Setting Short Description
Operation Operation Off/On
PowAmpFact Amplitude factor to scale power
calculations
PowAngComp Angle compensation for phase
shift between measured I & U
Mode Selection of measured current
and voltage
k Low pass filter coefficient for
power measurement, V and I
VGenZeroDb Zero point clamping in % of
Ubase
IGenZeroDb Zero point clamping in % of
Ibase
VBase (set in Base setting for voltage level in
Global base) kV
IBase (set in Base setting for current level in
Global base) A
SBase (set in Base Setting for power base in
Global base) MVA
Table 67: Settings parameters for level supervision
Setting Short Description
PMin
Minimum value
PMax
Minimum value
PZeroDb Zero point clamping in 0.001% of
range
PRepTyp
Reporting type
PDbRepInt
Cycl: Report interval (s), Db: In
0.001% of range, Int Db: In
0.001%s
Table continues on next page
Selected Comments
value
On Function must be
1.000 It can be used during commissioning
to achieve higher measurement
accuracy. Typically no scaling is
required
0.0 It can be used during commissioning
to achieve higher measurement
accuracy. Typically no angle
compensation is required. As well
here required direction of P & Q
measurement is towards protected
object (as per IED internal default
direction)
L1, L2, L3 All three phase-to-ground VT inputs
are available
0.00 Typically no additional filtering is
required
25 Set minimum voltage level to 25%.
Voltage below 25% will force S, P and
Q to zero.
3 Set minimum current level to 3%.
Current below 3% will force S, P and
Q to zero.
400.00 Set rated OHL phase-to-phase
voltage
1000 Set rated primary CT current used for
OHL
1000 Set based on rated Power
Selected Comments
value
-100 Minimum expected load
100 Maximum expected load
3000 Set zero point clamping to 60 MW
that is, 3% of 200 MW
db Select magnitude deadband
supervision
2000 Set ±Δdb=40 MW that is, 2% (larger
changes than 40 MW will be reported)
Section 18
Monitoring
On
871