Page 536 - Decision Making Applications in Modern Power Systems

494 Decision Making Applications in Modern Power Systems

FIGURE 18.10 Performance of WPE_BDT-3 and -4 modules for detection and classification
of shunt fault (double phase to ground fault-A1B1G): (A) Three phase instantaneous currents of
circuit-I (B) Three phase instantaneous currents of circuit-II (C) Three phase instantaneous vol-
tages at sending-end bus (D) Fault detection using WPE_BDT-3 module (E) Fault classification
using WPE_BDT-4 module. WPE_BDT, Wavelet packet energy and bagged decision tree.

TABLE 18.10 Response of wavelet packet energy and bagged decision
tree-3 and 4 modules for detection and classification of shunt faults
during the power swing.

Type Δδ Fault Fault classification time (ms)
of (degrees) detection
A1 B1 C1 G A2 B2 C2
fault time (ms)
Shunt AG 105 14.0 14 14
faults
ABG 110 22.0 22 22 22
AB 115 22.0 22 22
ABC 120 18.0 18 18 18 18
Shunt AG 105 14.0 14 14
faults
ABG 1 10 24.0 24 24 24
(power
swing) AB 115 17.0 17 17
ABC 120 19.0 19 19 19