Setting Notes - Siemens SIPROTEC 7SJ62 Manual

Functions
2.24 Protection for Single-phase Voltage Transformer Connection
2.24.3

Setting Notes

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 and 7SJ624 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
376
is always used for synchronization.
4
INs. Thus, the current elements are operated independently of VN.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008