Application And Setting Notes For Measuring Point Current 3-Phase (I-3Ph) - Siemens 6MD85 Manual

Function-Group Types
5.1 Power-System Data
A.7 Connection Examples of Voltage Transformers for Modular
assistance when selecting the type of connection.
Parameter: Inverted phases
•
Default setting (_:8911:106) Inverted phases = none
The Inverted phases parameter is intended for special applications, for example, pumped-storage hydro-
power plants (see chapter Phase-rotation reversal). This default setting may be retained for power-system
protection applications.
Parameter: Tracking
•
Default setting (_:8911:111) Tracking = active
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,
the device switches to another channel (etc.). Once switched to a current channel, the system automatically
switches back to the voltage channel if a voltage channel is valid again.
Parameter Value
active
inactive
Parameter: Magnitude correction
•
Default setting (_:3811:103) Magnitude correction = 1.000
When using the Magnitude correction parameter, the magnitude (magnitude correction) is adjusted for
the voltage input. This allows you to correct the tolerances of the primary current transformer phase-selec-
tively. The magnitude correction may be required for highly precise measurements. Use a comparison meas-
urement to determine the setting value (for example, with a high-precision measuring-voltage transformer). If
a primary correction is not necessary, retain the default setting.
NOTE
i
i
The Magnitude correction parameter has nothing to do with the internal adjustment of the input
circuit.
You will find more parameters in chapter

Application and Setting Notes for Measuring Point Current 3-Phase (I-3ph)

5.1.5
The supervision function settings are also located in the current measuring point. You can find the description
of these settings in chapter
Parameter: CT connection
•
Default setting (_:8881:115) CT connection = 3-phase + IN-separate
186
Description
If you have set the parameter Tracking = active, the measuring point
will be included when determining the sampling frequency. If possible, only
the 3-phase measuring points shall be considered.
Siemens recommends using the default setting.
Note: If the parameter Tracking = active , the determined sampling
frequency applies to all functions in the device not using fixed sampling
rates.
If the channels of the measuring point are not to be considered for deter-
mining the sampling frequency, please select the setting value inactive.
8.3.1 Overview.
8 Supervision Functions.
Devices. The connection examples provide
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017