Siemens 7SJ85 - Application and Setting Notes for Measuring Point Voltage 1-Phase (V-1 Ph)

Application and Setting Notes for Measuring Point Voltage 1-Phase (V-1ph)
If you insert a Measuring point V 1-ph in DIGSI 5, you must route a voltage to the measuring point under
Name of the device → Measuring-points routing → Voltage-measuring points.
You can route the following voltages:
•
V A
•
V B
•
V C
•
V AB
•
V BC
•
V CA
•
VN
15
•
Vx
•
VN broken-delta
16
Parameter: Rated primary voltage
•
Default setting (_:2311:101) Rated primary voltage = 400.000 kV
The Rated primary voltage parameter is used to set the primary rated voltage of the voltage trans-
former.
Parameter: Rated secondary voltage
•
Default setting (_:2311:102) Rated secondary voltage = 100 V
The Rated secondary voltage parameter is used to set the secondary rated voltage of the voltage trans-
former.
Parameter: Matching ratio Vph / VN
•
Default setting (_:2311:108) Matching ratio Vph / VN = 1.73
With the parameter Matching ratio Vph / VN, you set the deviation between the calculated zero-
sequence voltage and the residual voltage measured directly via a measuring input.
You can find more detailed information in chapter 6.1.6 Application and Setting Notes for Measuring Point
Voltage 3-Phase (V-3ph).
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i
NOTE
The Matching ratio Vph / VN parameter is only visible in the Measuring point V 1-ph if the voltage
VN broken-delta has been routed.
Parameter: Tracking
•
Default setting (_:2311:103) Tracking = inactive
The Tracking parameter is used to determine whether the measuring channels of this measuring point shall
be used to determine the sampling frequency.
The sampling frequency of the device is adjusted to the power frequency. The device selects a measuring
channel, through which the sampling frequency is determined. Preferably, this should be a voltage metering
channel. The validity of this signal is monitored (minimum level, frequency range). If these values are invalid,
6.1.7
15
If you route this voltage, the protection functions operate with the neutral-point displacement voltage.
16
If you route this voltage, the protection functions operate with the voltage measured directly at the broken-delta winding of the
voltage transformer.
Protection and Automation Functions
6.1 Power-System Data
SIPROTEC 5, Overcurrent Protection, Manual 311
C53000-G5040-C017-8, Edition 07.2017