Engineering Guide: What is the difference between a “Festoon” cable application and a “Reeling” application under VDE selection guidelines?
Published by: Anhui Feichun Special Cable Co., Ltd.
Experts in Port Machinery Electrification and Cable Dynamics
1. Executive Summary: The Mechanics of Movement
2. Festoon Systems (Cable Trolleys)
Mechanism: Cables hang in loops (festoons) supported by trolleys that run along a C-track or I-beam. As the crane moves, the trolleys gather (compress) or spread out (extend).
Primary Stress: Bending (Flexing). The cable is bent and straightened repeatedly at the bottom of the loop. There is very little tensile (pulling) load on the copper, as the trolleys carry the weight.
Ideal Cable Geometry: Flat Cables (Flachleitung). Flat cables like (N)GRDGÖU or (N)GFLGÖU are preferred because they bend easily in one plane and can be stacked efficiently without twisting.
机制： 电缆以环形（垂形）悬挂，由沿着 C 型轨道或工字钢运行的小车支撑。当起重机移动时，小车聚集（压缩）或展开（延伸）。
主要应力： 弯曲（屈挠）。 电缆在环的底部反复弯曲和伸直。铜导体上的拉伸（拉力）负荷非常小，因为小车承受了重量。
理想电缆几何形状： 扁平电缆 (Flachleitung)。 扁平电缆如 (N)GRDGÖU 或 (N)GFLGÖU 是首选，因为它们易于在一个平面内弯曲，并且可以高效堆叠而不会扭曲。
- Anhui Feichun Recommended Models: (N)GRDGÖU (Rubber Flat), H07VVH6-F (PVC Flat for indoor).
- Key VDE Parameter: Minimum Bending Radius (typically 3-5x Cable Thickness).
3. Reeling Systems (Cable Drums)
Mechanism: The cable is wound onto a large motorized or spring-driven cylindrical drum. The drum pulls the cable off the ground as the machine moves.
Primary Stress: Tension (Tensile Load) + Torsion (Twisting). The cable must withstand the pulling force of the drum. Furthermore, winding a cable inherently introduces a twisting force.
Ideal Cable Geometry: Round Cables with Anti-Torsion Braid. Flat cables are rarely used on drums (except specialized designs). Round cables like (N)TSCGEWÖU are mandatory. They MUST feature an internal textile or aramid braid to prevent “corkscrewing” (structural deformation).
机制： 电缆缠绕在一个大型电动或弹簧驱动的圆柱形卷筒上。当机器移动时，卷筒将电缆从地面拉起。
主要应力： 张力（拉伸负荷）+ 扭转（扭曲）。 电缆必须承受卷筒的拉力。此外，缠绕电缆本质上会引入扭转力。
理想电缆几何形状： 带有抗扭转编织层的圆形电缆。 扁平电缆很少用于卷筒（特殊设计除外）。必须使用像 (N)TSCGEWÖU 这样的圆形电缆。它们必须具有内部纺织或芳纶编织层，以防止“螺旋变形”（结构变形）。
- Anhui Feichun Recommended Models: (N)TSCGEWÖU (HV), (N)SHTÖU (LV), (N)TSKCGEWÖU.
- Key VDE Parameter: Maximum Tensile Load (typically 15-20 N/mm² dynamic).
4. Technical Comparison Table (VDE Guidelines)
| Feature (特性) | Festoon Application (拖令应用) | Reeling Application (卷盘应用) |
|---|---|---|
| Dominant Mechanical Force 主导机械力 | Continuous Bending 连续弯曲 | High Tension & Torsion 高张力 & 扭转 |
| Cable Shape Preference 电缆形状偏好 | FLAT (Preferred for stacking stability) 扁平（首选，为了堆叠稳定性） | ROUND (Mandatory for uniform winding) 圆形（强制，为了均匀卷绕） |
| Internal Reinforcement 内部增强 | Usually none required (Copper carries current only). 通常不需要（铜仅承载电流）。 | Anti-Torsion Braid (Crucial). 抗扭转编织层（至关重要）。 |
| Heat Dissipation 散热 | Good. Flat cables have high surface area. 好。 扁平电缆表面积大。 | Poor. Multi-layer winding traps heat (De-rating required). 差。 多层卷绕会聚集热量（需要降容）。 |
| Typical Speed 典型速度 | Up to 240 m/min (High Speed Trolleys) 高达 240 m/min | Up to 120 m/min (Motorized Reels) 高达 120 m/min |
5. Engineering Warning: The “Reeling Factor”
A critical mistake in Reeling applications is ignoring the thermal buildup. When a cable is fully wound on a drum but still energized (current flowing), it acts like an induction coil heater. VDE 0298-4 requires a strict de-rating factor.
- 1 Layer on Drum: Factor 0.80
- 2 Layers on Drum: Factor 0.61
- 3 Layers on Drum: Factor 0.49
- 4 Layers on Drum: Factor 0.42
Implication: You often need a much larger cross-section cable for a Reeling Drum than for a Festoon System carrying the same current.
卷盘上的热降容： 卷盘应用中的一个严重错误是忽视热量积聚。当电缆完全缠绕在卷筒上但仍然通电（电流流动）时，它的作用就像感应线圈加热器。VDE 0298-4 要求严格的降容系数。
含义： 对于承载相同电流的卷盘卷筒，您通常需要比拖令系统使用截面积大得多的电缆。
Contact Anhui Feichun Special Cable Co., Ltd.
System Design Consultation: Festoon & Reeling Solutions
