Siemens SICAM - Pulse-Location Detection Mechanism

Table 4-9 Ground-Fault Detection with Cos φ/Sin φ Measurement Method Range
I
dir
Range Status
0 Vector method is enabled
0.2 A to 30 A Ground-fault detection with cos φ/sin φ measurement method is enabled
i
i
NOTE
In the solidly grounded system, set the I
dir
parameter to 0.
Determination of a Ground Fault with the Pulse-Location Detection
Mechanism
The Pulse-location detection mechanism detects a faulty feeder during a permanent ground fault in
overcompensated systems. The Pulse-location detection mechanism is applicable for resonanlt-grounded
systems only and not applicable to the undercompensated systems.
Figure 4-15 shows a simplified network with the pulse-location detection mechanism. The pulse pattern in the
ground current I
N
is generated by switching on and off a capacitor in parallel to the arc-suppression coil:
•
When the capacitor is switched on, an additional capacitive ground current is generated and the ground-
current compensation changes.
•
When the capacitor is switched off, the additional capacitive ground current no longer exists and the
ground-current compensation returns to the normal state.
4.1.21
Device Functions
4.1 Description
46 SICAM, Feeder Condition Monitor, Manual
E50417-H8940-C580-A4, Edition 03.2019