Table 4 Detection methods affected by different SNRs.

From: A novel approach for high impedance fault detection in resonant grounding systems based on statistical characteristics

Method

Detection method

Values of feature quantities

Set threshold

Recognition time

(s)

Correct or false

30db

20db

15db

10db

1

Based on fault phase voltage polarization (time domain)30

0.224

0.173

0.256

0.249

0.3 (exceed)

23.16

False

2

Interharmonic-based (frequency domain)28

0.378

0.405

0.573

0.699

0.4 (exceed)

129.57

False

3

Based on zero-sequence voltage spectrum (frequency domain)31

0.0257

0.0216

0.0204

0.0187

0.02 (below)

167.55

False

4

Hybrid wavelet algorithm (time-frequency domain)32

0.198

0.210

0.262

0.293

0.15 (exceed)

205.38

Correct

5

Based on wavelet energy moments (time-frequency domain)23

2.147

4.268

5.36

5.57

0 (exceed)

303.92

Correct

6

D-S fusion judgment (artificial intelligence)33

0.59

0.677

0.725

0.839

0.5 (exceed)

497.13

Correct

 

Proposed method

0.0026

0.0046

0.0052

0.0055

0.002 (exceed)

100.18

Correct

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