High-voltage power lines are critical components of modern electrical grids, and ensuring their reliability and safety is paramount. The 220kV linear tower, a common structure in transmission networks, requires regular and precise inspection to prevent faults and maintain operational efficiency. This article provides a comprehensive overview of the key inspection points and standards for UAV-based power line inspections, highlighting best practices, critical components to monitor, and the technical guidelines that ensure inspections are both thorough and safe. Whether for training, operational planning, or industry compliance, understanding these standards is essential for professionals involved in high-voltage line maintenance.
| Serial Number | Inspection points | Shooting quality requirements | Software checkpoint screenshot | Real Inspection Point Images |
|---|---|---|---|---|
| 1 | Full Tower View | The entire tower structure must be visible, with clear identification of materials and tower angles; tower should occupy at least 80% of the frame vertically. |  | |
| 2 | Tower Top | Tower head must be fully visible. |  | |
| 3 | Tower Body | Full visible structure excluding the tower head and base. |  | |
| 4 | Tower Identification Plate | Tower ID plate must be clear and readable, including line name and tower ID. |  | |
| 5 | Tower Base | Ground area around the base must be visible, showing guy wire attachment conditions and connections. |  | |
| 6 | Left Phase Conductor Suspension Point | Bolts, nuts, cotter pins, and small fittings must be clearly visible, including vibration dampers. Use multi-angle shots if equipment overlap occurs. Each photo must include at least one insulator disc. |  | |
| 7 | Left Phase Insulator String | Entire insulator string must be captured. Multiple images allowed. Surface damage and each insulator connection point must be clearly identifiable. |  | |
| 8 | Left Phase Cross-arm Connection | Bolts, nuts, cotter pins, and small fittings must be clear. Multi-angle shots if components block view. Each photo must include at least one insulator disc. |  | |
| 9 | Left Ground Wire | Must verify correct fitting assembly, aluminum wrapping at contact point, and locking components. Multi-angle shots if blocked. |  | |
| 10 | Middle Phase Cross-arm Connection | Bolts, nuts, cotter pins, and small fittings must be clearly visible. Multi-angle if blocked. Each photo must include at least one insulator disc. |  | |
| 11 | Middle Phase Insulator String | Entire insulator string must be captured; multiple shots allowed. Must clearly show surface conditions and each connection piece. |  | |
| 12 | Middle Phase Conductor Suspension Point | Bolts, nuts, cotter pins, and fittings must be visible, including vibration dampers. Multi-angle if blocked. Each photo must include at least one insulator disc. |  | |
| 13 | Right Ground Wire | Must verify correct fitting assembly, aluminum wrapping at contact point, and locking components. Multi-angle if blocked. |  | |
| 14 | Right Phase Cross-arm Connection | Bolts, nuts, cotter pins, and small fittings must be clearly visible. Multi-angle if blocked. Each photo must include at least one insulator disc. |  | |
| 15 | ight Phase Insulator String | Entire string must be captured. If not possible, split into two shots. Must clearly show surface conditions and connections. |  | |
| 16 | Right Phase Conductor Suspension Point | Bolts, nuts, cotter pins, and vibration dampers must be visible. Multi-angle if blocked. Each photo must include at least one insulator disc. |  | |
| 17 | Narrow-Side Corridor | Entire tower corridor path must be visible, including buildings, trees, crossings, and intersecting lines. |  | |
| 18 | Wide-Side Corridor | Entire tower corridor path must be visible, including buildings, trees, crossings, and intersecting lines. |  |
