Pickup, Operate, and Reset logic for the Integrator and Counter Mode
[LoIntdir3, 4, en_US]
Figure 6-118
Pickup, Operate, and Reset Logic in Operating Mode Integrator and Counter
(1) The internal signal 4 and 5 are from Figure 6-116.
Measurement Value for Pickup and Integration
The stage calculates the RMS value of 3I0 since this value takes into account the higher-order harmonic
components and the direct component (DC). Both components contribute to the thermal load.
Pickup, Limited Pickup, and Stabilized Pickup
Whenever 3I0 exceeds Threshold, the stage issues the signal
Pickup
. The signal is intended to be applied
for LED and relay output.
Stabilized pickup
is formed by prolonging the pickup indication by a settable time Pickup extension
time. This stabilization is especially important for the coordination with the existing static or electromechan-
ical overcurrent protection.
The
Limited pickup (log)
signal is intend to be applied for logging and communication interface. The
Limited pickup (log)
signal will be entered in the fault log and reported via the system interface unless
the
Intermittent gnd.flt.
indication is given. This behavior prevents a burst of indications.
Protection and Automation Functions
6.14 Directional Intermittent Ground-Fault Protection
556 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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