Setting Notes - Siemens SIPROTEC 4 User Manual

Directional Intermittent Ground Fault Protection
If only one voltage transformer is connected, this function is inactive and hidden.
Reactive Power Direction Undervoltage Protection QU Protection
If only one voltage transformer is connected, this function is inactive and hidden.
Fault Locator
If the device is connected to only one voltage transformer, this function is disabled and hidden.
Monitoring Functions
Voltage-measuring monitoring functions such as "Voltage symmetry" and "Fuse-Failure-Monitor" cannot be
applied. They are set inactive and are hidden.
Operational Measured Values
Several operational measured values cannot be calculated. If whole groups of operational measured values are
concerned, they will be hidden. If only parts of a group are concerned, corresponding operational measured
values are set invalid (values are replaced by dashes) or reset.

Setting Notes

2.26.3
Voltage Connection
Address 240 VT Connect. 1ph is set to ensure that only one voltage transformer is connected to the device
and to define the type of voltage transformer connected to it. Thus, the user specifies which primary voltage is
connected to which analog input. If one of the voltages offered is selected, i.e. a setting unequal NO, setting of
address 213 for multiple-phase connection is no more relevant. Only address 240 is to be set.
For 7SJ64, 7SJ623, 7SJ624, 7SJ625 and 7SJ626 with single-phase voltage transformer connection, the voltage
connected to voltage input V
Nominal Values of Voltage Transformers
In addresses 202 Vnom PRIMARY and 203 Vnom SECONDARY set, as usual, the voltage transformer nominal
values defined as phase-to-phase quantities. This depends on whether the device is connected to a phase
voltage or phase-to-phase voltage.
Undervoltage Protection, Overvoltage Protection, Frequency Protection
If phase-to-ground voltage connection is selected for address 240, the voltage thresholds of this function also
have to be set as phase-to-ground voltages. If phase-to-phase connection is selected for address 240, the
voltage thresholds of this function also have to be set as phase-to-phase voltages.
(Sensitive) Ground Fault Detection
All directional- and voltage-type settings (addresses 3102 to 3107, 3109 to 3112 and 3123 to 3126) are of no
significance. Thus, their settings may not be modified.
Current elements are to be set to Non-Directional in addresses 3115 and 3122.
Set parameter 3130 to Vgnd OR INs. Thus, the current elements are operated independently of VN.
Example:
In a system with a primary nominal voltage of 138 kV and a secondary nominal voltage of 115 V, single-phase
voltage V is connected (see
A–N
Threshold values for voltage protection are set as follows:
Overvoltage 59-1:
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
2.26 Protection for Single-phase Voltage Transformer Connection
is always used for synchronization.
4
Figure 2-151).
to 120 % V
Nom
Functions
351