Table 2 Signal decomposition Details.

From: Multiscale detection of power quality disturbances and cyber intrusions in smart grids using NSCT and frequency band scalograms

Scale

s

Directionθ

Energy Before

Ebefore (s, θ)

Energy After

Eafter (s, θ))

Energy Difference (%)

SNR (dB)

Comments

Level 1

0 (horizontal)

1.02

0.83

18.6%

32.5

Main fault component, high energy retention

Level 1

45 (diagonal)

0.94

0.75

20.2%

31.7

Partial harmonic components detected

Level 2

90 (vertical)

0.89

0.80

10.1%

30.9

Detects high-frequency transients

Level 2

135 (diagonal)

0.72

0.65

9.7%

29.8

Captures harmonic distortions