Ground Fault Detection For V0/I0-Φ Measurement - Siemens SIPROTEC 4 Manual

Functions
2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
[7sj80-erdfehler-iee-cos-sin-20061206, 1, en_US]
Figure 2-72
Ground Fault Detection for V0/I0-ϕ Measurement
2.12.2
Voltage Element
The voltage element relies on a pickup initiated by the displacement voltage V
faulty phase is determined. The displacement voltage V
tion voltage 3 · V
Parameter 213 VT Connect. 3ph in Section
the calculation of the summation voltage 3 · V
voltage inputs must therefore be connected to the voltage transformers in a grounded-wye configuration.
When setting Vab, Vbc, VGnd, the three phase-to-Ground voltages of both connected phase-to-phase
voltages and the connected displacement voltage are calculated. If the device is only provided with phase-to-
phase voltages, it is not possible to calculate a displacement voltage from them. In this case, the direction
cannot be determined.
178
Logic diagram of the Ι elements for cos-ϕ -/sin-ϕ measurement
Ns
can be calculated according to the connection type of the voltage transformer (see also
0
can be directly applied to the device, or the summa-
0
2.1.3 Power System Data 1). When setting Van, Vbn, Vcn,
is based on the three phase-to–Ground voltages. The three
0
or 3 · V . Additionally, the
0 0
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017