Functions
2.24 Protection for Single-phase Voltage Transformer Connection
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
377
Example:
In a system with a primary nominal voltage of 138 kV and a secondary nominal voltage of 115 V, single-phase
voltage V
A–N
is connected (see Figure 2-143).
Threshold values for voltage protection are set as follows:
Overvoltage 59-1: to 120 % V
Nom
Undervoltage 27-1: to 60 % V
Nom
Figure 2-143 Example of a single-phase voltage transformer connection (phase-to-ground)
Apply the following settings to the device:
Address 202 Vnom PRIMARY = 138 kV
Address 203 Vnom SECONDARY = 115 V
Address 240 VT Connect. 1ph = Van
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