Setting Notes - Siemens siprotec SJ62 User Manual

2.24.3 Setting Notes

Voltage Connection
Nominal Values of
Voltage Transform-
ers
Undervoltage Pro-
tection, Overvolt-
age Protection, Fre-
quency Protection
Sensitive Ground
Fault Detection
Example:
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
2.24 Protection for Single-phase Voltage Transformer 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.
With 7SJ64 and single-phase voltage transformer connection the voltage connected
to voltage input V is always used for synchronization.
4
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.
If phase-ground voltage connection is selected for address 240, voltage thresholds of
this function also have to be set as phase-ground voltages. If phase-phase voltage
connection is selected for address 240, also voltage thresholds of this function have
to be set as phase-phase voltages.
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 address 3130 to Vgnd OR
dent of VN.
In a system with a primary nominal voltage of 138 kV and a secondary nominal voltage
of 115 V, single-phase voltage V
Threshold values for voltage protection are set as follows:
Overvoltage 59-1:
Undervoltage 27-1:
Figure 2-123 Example of a single-phase voltage transformer connection (Phase-ground)
INs. Thus, current elements are operated indepen-
is connected (see Figure 2-123).
A–N
to 120 % V
Nom
to 60 % V
Nom
348