Page 537 - Decision Making Applications in Modern Power Systems

A reliable decision-making algorithm Chapter | 18 495

FIGURE 18.11 Performance of WPE_BDT-3 and -4 modules for detection and classification
of shunt fault during PS, with variation in power flow angle: (A) Three phase instantaneous cur-
rents of circuit-I (B) Three phase instantaneous currents of circuit-II (C) Power flow angle 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 18.11 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 ΔZ S1 ΔZ S2 Fault Fault classification time (ms)
of (%) (%) detection
A1 B1 C1 G A2 B2 C2
fault time (ms)
Shunt AG 210 12.0 12 12
faults
ABG 25 16.0 16 16 16
AB 15 18.0 18 18
ABC 110 11.0 11 11 11
Shunt AG 2 10 25.0 25 25
faults
(power ABG 25 16.0 16 16 16
swing)
AB 15 21.0 21 21
ABC 110 29.0 29 29 29