Function Current
input 2
(Ι
N2
)
Current
input 4
(Ι
N
/ Ι
Ns
)
Time overcurrent protection ground 50N/51N (Section 2.2 Overcurrent Protection 50, 51, 50N,
51N)
x
Directional time overcurrent protection ground 67N (Section 2.3 Directional Overcurrent Protec-
tion 67, 67N).
x
Ground fault detection 64, 67N(s), 50N(s), 51N(s) (Section 2.12 Ground Fault Protection 64,
67N(s), 50N(s), 51N(s))
x
Single-phase Time Overcurrent Protection (Section2.5 Single-Phase Overcurrent Protection) x
Operational Measured Values Display
Ι
N
Ι
Ns
Track in disturbance record
Ι
N
Ι
Ns
Important! The function “Directional Time Overcurrent Protection Ground 67N” may only be enabled if the
ground current of the protected line is measured via Ι
N2
. This is not the case in the example shown in
Figure 2-3. Here, the ground current of the protected line is measured via Ι
N
. The function must be deacti-
vated. A connection in which the function can be enabled is illustrated in the Appendix C Connection Exam-
ples Figure C-11
The settings for address 251 are only possible with DIGSI at Display Additional Settings-
The Appendix provides some connection examples at C Connection Examples.
NOTE
The settings in address 2251 CT Connect. for evaluating the phase currents are only effective if address
250 50/51 2-ph prot was set to OFF.
Voltage Connection (Power System)
Address 213 specifies how the voltage transformers are connected.
VT Connect. 3ph = Van, Vbn, Vcn means that the three phase voltages are wye connected, i.e. the
three phase-to-ground voltages are measured.ground.
VT Connect. 3ph = Vab, Vbc, VGnd means that two phase-to-phase voltages (open delta voltage) and
the displacement voltage V
GND
are connected.
VT Connect. 3ph = Vab, Vbc means that two phase-to-phase voltages (open delta voltage) are
connected. The third voltage transformer of the device is not used.
VT Connect. 3ph = Vab, Vbc, Vx means that two phase-to-phase voltages (open delta voltage) are
connected. Furthermore, any third voltage V
x
is connected that is used exclusively for the flexible protection
functions. The transformer nominal voltages for V
x
are set at address 232 and 233.
VT Connect. 3ph = Vab, Vbc, VSyn means that two phase-to-phase voltages (open delta voltage) and
the reference voltage for V
SYN
are connected. This setting is enabled if the synchronization function of the
device is used.
VT Connect. 3ph = Vph-g, VSyn is used if the synchronization function of the device is used and only
phase-to-ground voltages are available for the protected object to be synchronized. One of these voltages is
connected to the first voltage transformer; the reference voltage V
SYN
is connected to the third voltage trans-
former.
The selection of the voltage transformer connection affects the operation of all device functions that require
voltage input.
The settings Vab, Vbc or Vab, Vbc, Vx or Vab, Vbc, VSyn or Vph-g, VSyn do not allow determining
the zero sequence voltage. The associated protection functions are inactive in this case.
The table gives an overview of the functions that can be activated for the corresponding connection type
(depends also on the ordering number). The functions which are not shown are available for all connection
types.
Functions
2.1 General
40 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
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