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Table 3 Defect classification of tree barrier [29]

From: Fast image recognition of transmission tower based on big data

Voltage level Emergency defects Major defects General defects
vertical distance (m) horizontal distance (m) vertical distance (m) horizontal distance (m) vertical distance (m) horizontal distance (m)
110 kV d v  ≤ 4 d h  ≤ 3.5 4 < d v  ≤ 7 3.5 < d h  ≤ 6.5 7 < d v  ≤ 13 6.5 < d h  ≤ 12.5
220 kV d v  ≤ 4.5 d h  ≤ 4 4.5 < d v  ≤ 7.5 4 < d h  ≤ 7 7.5 < d v  ≤ 13.5 7 < d h  ≤ 13
500 kV d v  ≤ 7 d h  ≤ 7 7 < d v  ≤ 10 7 < d h  ≤ 10 10 < d v  ≤ 16 10 < d h  ≤ 16