Functions
2.24 Protection for Single-phase Voltage Transformer Connection
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
376
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
4
is always used for synchronization.
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.
www
. ElectricalPartManuals
. com
