Siemens SICAM Manual page 47

[lo_sfcm_pulse_pattern_mech, 1, en_US]
Figure 4-15
C Capacitance of the switched capacitor
S
L Inductance of the Petersen coil
The Figure 4-16
ground fault and a high-impedance ground fault.
•
For low-impedance ground faults, the pulse pattern exists only in the faulty feeder.
•
For high-impedance ground faults, the pulse pattern is also present in the healthy feeders with lower
amplitude but in phase opposition to the faulty feeder.
Using different values of the parameters Pulse-on duration (TPulse ON) and Pulse-off
duration (TPulse OFF), the differentiation between healthy and faulty feeders for high-impedance
ground faults can be ascertained.
SICAM, Feeder Condition Monitor, Manual
E50417-H8940-C580-A4, Edition 03.2019
Network in Pulse-Location Detection
shows the ground-current pulse pattern in an overcompensated system for a low-impedance
Device Functions
4.1 Description
47