Siemens SICAM Manual page 34

Device Functions
4.1 Description
[lo_fault_det_ini_and_reset, 3, en_US]
Figure 4-5
For isolated ground:
I (Watt-metric) = I
N
For resonant ground:
I (Watt-metric) = I
N
For more information about ground-fault detection by watt-metric method, refer to chapter
Fault Detection with Cos φ/Sin φ Measurement
NOTE
i
i
For solid ground or if I
NOTE
i
i
For solid ground or if V
ground fault.
The following logic diagram illustrates the fault indication and fault reset.
34
Logic Diagram for Fault-Detection Initiation and Fault Reset
⋅ sin φ
N
⋅ cos φ
N
is set to 0, I is disabled and only I
dir dir
> is set to 0, V is disabled and only I
N NG
is used for detecting the ground fault.
N
/I (Watt-metric) is used for detecting the
N N
SICAM, Feeder Condition Monitor, Manual
E50417-H8940-C580-A4, Edition 03.2019
4.1.20 Ground-