Protection For Single-Phase Voltage Transformer Connection; Connection; Impacts On The Functionality Of The Device - Siemens SIPROTEC 4 User Manual

2.26

Protection for Single-phase Voltage Transformer Connection

Devices 7SJ62/64 may also be connected to only one primary voltage transformer. Impacts on protective func-
tions to be taken into consideration are described in this section.
Applications
•
For some applications there is only one voltage transformer on the primary voltage side. Usually it is a
phase voltage. However, it may also be a phase-to-phase voltage. Via configuration the device may be
adapted for such an application.
2.26.1

Connection

The device may optionally be supplied with a phase-to-ground voltage (e.g. V
(e.g. V ). The connection mode has been specified during the configuration (see Subsection
AB
Notes) in address 240 VT Connect. 1ph. The following figure shows a connection example. Further exam-
ples can be found in the Appendix
[anschluss-sj62-63-einphas-l3-e-250902-kn, 1, en_US]
Figure 2-149
2.26.2

Impacts on the Functionality of the Device

When a device is operated by only one voltage transformer, this will have an impact on several device func-
tions. The ones affected are described in the following. Furthermore, this type of connection is dealt with in
the functional descriptions. Functions not mentioned in the following are not affected by this type of connec-
tion.
Undervoltage Protection, Overvoltage Protection (27, 59 Elements)
Depending on the configuration in address 240 voltage protection is either operated by a phase-to-ground or
a phase-to-phase voltage. Therefore, if the device is connected to a phase-to-ground voltage, set the phase
voltage threshold. If connected to a phase-phase voltage, set the phase-to-phase voltage threshold. In
contrast, with three-phase connection, the threshold generally represents a phase-to-phase quantity. See also
Section 2.6.4 Setting
Der Spannungsschutz arbeitet entweder mit einer Leiter-ground- oder Leiter-Leiter-Spannung, entsprechend
der Parametrierung unter Adresse 240. Dies bedeutet, dass der Schwellwert bei Anschluss einer Leiter-ground-
Spannung als Phasenspannung und bei Anschluss einer Leiter-Leiter-Spannung als verkettete Spannung
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
C Connection
Connection example of a single-phase voltage transformer for 7SJ62 with phase-to-ground
voltage V
C–N
Notes.
2.26 Protection for Single-phase Voltage Transformer Connection
Examples.
Functions
) or a phase-to-phase voltage
A–N
2.1.3.2 Setting
349