Siemens SIPROTEC 6MU805, Руководство пользователя, Страница: 28 / 162

Functions
2.1 General
SIPROTEC, 6MU805, Manual
C53000-G1140-C380-5, Release date 06.2018
24
Current Clipping Limit Ratio
Address 0
480 ClipC
informs the ratio of the clipping limit of the instantaneous current to the rated primary
voltage multiplied with a square root of two. For example “clip=20” applied with rated primary current of
IP
r
=500A
RMS
means clipping will occur at ±14140A
PEAK.
Primary currents with magnitude above the clipping
limit may saturate analogue circuits and/or digital filters within the instrument transformer resulting in highly in-
accurate sampled values
Voltage Clipping Limit Ratio
Address 0
481 ClipV
informs the ratio of the clipping limit of the instantaneous voltage to the rated primary
voltage multiplied with a square root of two. For example “clip=2” applied with rated primary voltage of UP
r
=5
kV
RMS
means clipping may occur at ±14.14 kV
PEAK
. Primary voltages with magnitude above the clipping limit
may saturate analogue circuits and/or digital filters within the instrument transformer resulting in highly inaccu-
rate sampled values
Nominal Values of Voltage Transformers (VTs) (Only For 1-phase System)
Currently 4 channels voltage are supported. Every channel has its own configuration. Address 0
570, 0572, 0574,
0576
are for Channel Rated Primary Volatge Values, and Address 0
571, 0573, 0575, 0577
are for Channel Rated
Second Voltage Values. At these addresses, information is entered regarding to the primary nominal voltage
and secondary nominal voltage (phase independent) of the connected voltage transformers
2.1.2.3 Settings
The table indicates region-specific default settings.
For clear reference, parameters for 1-phase and 3-phase are listed respectively.
Table 3: Settings for 3-phase Ratio
Addr. Parameter Setting Options Default Setting Comments
0202 Vnom PRIMARY 0.10 .. 800.00 kV 20.00 kV Rated Primary Voltage
0203 Vnom
SECONDARY 34 .. 400 V 100 V Rated Secondary Voltage (L-L)
0204 CT PRIMARY 10 .. 25000 A 400 A CT Rated Primary Current
0205 CT SECONDARY 1 A
5 A 1 A CT Rated Secondary Current
0206A Vph/Vdelta 1.00 .. 3.00 1.73 Matching ratio Phase-VT To
Open-Delta-VT
0214 Rated Frequency 50 Hz
60 Hz 50 Hz Rated Frequency
0217 Ignd-CT PRIM 1 .. 25000 A 400 A Ignd-CT rated primary current
0218 Ignd-CT SEC 1 A
5 A 1 A Ignd-CT rated secondary
current
0325 Vnom sec Vx 34 .. 230 V 100 V Rated Secondary Voltage Vx
0333 Vnom prim Vx 0.10 .. 800.00 kV 20.00 kV Rated Primary Voltage Vx
0352 U4 inverting YES
NO NO U4 inverting
0369 VT Con Type Conventional Conventional Voltage Connection Type