Table 4.

Variation of ENT of surface discharge images during AC flashover process.

Stages	0°	45°	90°	135°
Stage I	0.0365	0.0382	0.0365	0.0382
Stage II	0.0657	0.0686	0.0548	0.0686
Stage III	0.1285	0.1204	0.1154	0.1342
Stage IV	0.3464	0.3452	0.2832	0.3622
Stage V	0.547	0.5721	0.4918	0.6071
Stage VI	0.7827	0.7672	0.8107	0.7625
Stage VII	0.9212	0.9624	0.785	0.978
Stage VIII	2.2671	2.3593	2.0339	2.3798