Understanding Fiber Optic Integration in Reeling Cables 理解卷取电缆中的光纤集成

Modern port and industrial automation systems demand more than just reliable power transmission—they require real-time data communication capabilities integrated directly into their power cables. This is where fiber optic reeling cables become essential. These specialized cables combine medium voltage power conductors with optical fiber elements, enabling simultaneous power delivery and high-speed data transmission for sophisticated control systems, SCADA networks, and automated crane operations.

现代港口和工业自动化系统不仅需要可靠的电力传输，还需要将实时数据通信能力直接集成到电力电缆中。这就是光纤卷取电缆变得至关重要的地方。这些专用电缆将中压电力导体与光纤元件结合，实现同时供电和高速数据传输，用于复杂的控制系统、SCADA网络和自动化起重机操作。

Fiber Integration Architecture Comparison 光纤集成架构对比

1. Nexans RHEYFIRM®-FO: Interstices Accommodation Design Nexans专利设计：间隙容纳设计

The Nexans RHEYFIRM® (RTS) (N)TSCGEWTOEUS OFE cable employs a sophisticated interstices-based fiber accommodation system. Understanding this design requires recognizing how the cable’s core is structured. In a typical three-phase power cable, when three main power conductors and protective earth conductors are stranded together, natural triangular spaces (interstices) form between the conductors.

Nexans RHEYFIRM® (RTS) (N)TSCGEWTOEUS OFE电缆采用复杂的基于间隙的光纤容纳系统。理解这种设计需要认识电缆芯的结构。在典型的三相电力电缆中，当三根主电力导体和保护接地导体绞合在一起时，导体之间会形成自然的三角形空间(间隙)。

Nexans’ ingenious approach utilizes these naturally occurring spaces efficiently. The split protective earth cores are strategically integrated into two of the three interstices, while the optical fiber element (OFE) is accommodated within the third interstice. This arrangement provides several technical advantages: the fiber module is positioned in a mechanically stable zone within the cable’s neutral axis, minimizing bending stress during reeling operations; the surrounding power conductors act as natural mechanical protection for the fiber element; and the symmetric arrangement maintains balanced cable geometry, crucial for high-speed reeling without inducing cable twist.

Nexans的巧妙方法有效利用了这些自然形成的空间。分离的保护接地芯战略性地集成到三个间隙中的两个中，而光纤元件(OFE)则容纳在第三个间隙内。这种布置提供了几个技术优势：光纤模块位于电缆中性轴内的机械稳定区域，在卷取操作期间最小化弯曲应力；周围的电力导体为光纤元件提供自然的机械保护；对称布置保持平衡的电缆几何形状，对于高速卷取而不引起电缆扭转至关重要。

2. Generic (N)TSCGEWÖU-FO: Variable Integration Methods 通用型：可变集成方法

Generic (N)TSCGEWÖU-FO cables manufactured to DIN VDE 0250-813 may employ different fiber integration strategies depending on the manufacturer. The most common approach involves placing the optical fiber module as an additional element within the cable core, either centrally located or positioned alongside the power conductors. Some manufacturers use a modified interstices design, while others opt for a separate fiber tube stranded with the power cores.

按照DIN VDE 0250-813制造的通用(N)TSCGEWÖU-FO电缆根据制造商的不同可能采用不同的光纤集成策略。最常见的方法是将光纤模块作为额外元件放置在电缆芯内，位于中心或与电力导体并排。一些制造商使用改进的间隙设计，而另一些则选择与电力芯绞合的单独光纤管。

The flexibility in design permitted by the standard means that installation practices and fiber breakout procedures can vary significantly between manufacturers. While this variability allows manufacturers to optimize for cost or specific application requirements, it can also create challenges for standardization across multi-vendor installations.

标准允许的设计灵活性意味着安装实践和光纤分支程序在制造商之间可能存在显著差异。虽然这种可变性允许制造商针对成本或特定应用要求进行优化，但也可能为跨多供应商安装的标准化带来挑战。

Fiber Protection Technology: Loose Tube vs. Tight Buffer 光纤保护技术：松套管与紧套管

Understanding the Fundamental Difference 理解根本差异

To appreciate the differences in fiber breakout protection, we must first understand how optical fibers are protected within their tubes or buffers. This is not merely a matter of insulation—it fundamentally affects how the fiber responds to mechanical stress, temperature changes, and installation procedures.

要理解光纤分支保护的差异，我们必须首先了解光纤在其管道或缓冲层内如何受到保护。这不仅仅是绝缘问题——它从根本上影响光纤如何响应机械应力、温度变化和安装程序。

Fiber Breakout Protection Systems 光纤分支保护系统

What is Fiber Breakout? 什么是光纤分支？

Fiber breakout refers to the process and protective measures employed when individual optical fibers must be separated from the main cable and routed to termination points or connection panels. In crane and material handling applications, breakout typically occurs at the cable drum, junction boxes, or equipment control panels where the fiber must transition from the protective cable environment to individual connector housings.

光纤分支是指当必须从主电缆中分离单根光纤并路由到终端点或连接面板时所采用的过程和保护措施。在起重机和物料搬运应用中，分支通常发生在电缆卷筒、接线盒或设备控制面板处，光纤必须从保护性电缆环境过渡到单独的连接器外壳。

RHEYFIRM®-FO Breakout Methodology RHEYFIRM®-FO分支方法

The Nexans RHEYFIRM® system typically employs loose tube, gel-filled fiber protection. When breaking out fibers from this design, technicians must follow a systematic procedure. First, the outer cable sheath and strength members are carefully stripped back to expose the fiber tube while maintaining adequate strain relief. The gel-filled loose tube is then accessed, requiring thorough cleaning with appropriate solvents to remove the gel compound without damaging the 250 μm fibers.

Nexans RHEYFIRM®系统通常采用松套管、凝胶填充的光纤保护。从这种设计中分支光纤时，技术人员必须遵循系统程序。首先，仔细剥除外电缆护套和强度构件，露出光纤管，同时保持足够的应变释放。然后访问凝胶填充的松套管，需要用适当的溶剂彻底清洁以去除凝胶化合物，而不损坏250微米光纤。

Individual fibers are then inserted into furcation tubing (also called breakout kits), which consists of aramid yarn strength members and protective tubing that builds the 250 μm fiber up to a more robust 3 mm diameter. This furcation provides the necessary mechanical protection for individual fiber routing. Strain relief is achieved through a combination of the aramid yarn within the furcation tubing and proper cable management at the breakout point, ensuring no tensile load is transmitted to the glass fiber itself.

然后将单根光纤插入分支管(也称为分支套件)，由芳纶纤维强度构件和保护管组成，将250微米光纤构建到更坚固的3毫米直径。这种分支为单根光纤布线提供了必要的机械保护。通过分支管内的芳纶纤维和分支点处的适当电缆管理的组合来实现应变释放，确保没有拉伸负载传递到玻璃光纤本身。

Generic (N)TSCGEWÖU-FO Breakout Variations 通用型分支变化

Generic (N)TSCGEWÖU-FO cables may use either loose tube or tight buffer construction, depending on the manufacturer’s design choices. When tight buffer construction is employed, the breakout process is considerably simplified. The 900 μm tight-buffered fibers can often be directly terminated with connectors without requiring furcation kits, reducing installation time and complexity.

通用(N)TSCGEWÖU-FO电缆根据制造商的设计选择可能使用松套管或紧套管结构。当采用紧套管结构时，分支过程大大简化。900微米紧套管光纤通常可以直接用连接器端接，无需分支套件，减少安装时间和复杂性。

However, this design flexibility means that contractors must verify the specific construction method used before specifying termination procedures. A mixed installation with cables from different manufacturers might require maintaining multiple sets of termination tools and procedures.

然而，这种设计灵活性意味着承包商必须在指定终端程序之前验证所使用的特定结构方法。来自不同制造商的电缆的混合安装可能需要维护多套终端工具和程序。

Strain Relief Engineering 应变释放工程

The Physics of Fiber Strain 光纤应变物理学

Optical fibers are remarkably strong in terms of tensile strength—theoretically capable of withstanding significant pulling forces. However, glass is inherently brittle, and any micro-defects or scratches become stress concentration points that can lead to catastrophic failure under tension. This is why strain relief is not merely about preventing fiber breakage under normal loads; it is about ensuring that zero tensile load ever reaches the glass fiber, even under worst-case scenarios.

就拉伸强度而言，光纤非常坚固——理论上能够承受显著的拉力。然而，玻璃本质上是脆性的，任何微缺陷或划痕都会成为应力集中点，在张力下可能导致灾难性失败。这就是为什么应变释放不仅仅是防止正常负载下的光纤断裂；它是为了确保即使在最坏情况下，零拉伸负载也不会到达玻璃光纤。

In reeling cable applications, strain relief becomes particularly critical because the cables experience dynamic loading during reel operation, potential snagging during payout, and significant tension during cable pulling. The fiber protection system must isolate the optical fiber from all these mechanical stresses.

在卷取电缆应用中，应变释放变得特别关键，因为电缆在卷筒操作期间经历动态负载，在放线期间可能缠绕，在电缆牵引期间经历显著张力。光纤保护系统必须将光纤与所有这些机械应力隔离。

RHEYFIRM® Strain Relief System RHEYFIRM®应变释放系统

The RHEYFIRM® cable incorporates multiple layers of strain relief protection. At the cable level, the synthetic thread reinforcement braid (designed for high tensile strength) absorbs torsional and tensile stresses, preventing these forces from reaching the inner cable core. The loose tube construction itself provides inherent strain relief—when the cable is pulled, the tube can elongate slightly while the fiber remains unstressed within the gel-filled environment.

RHEYFIRM®电缆结合了多层应变释放保护。在电缆层面，合成线增强编织(设计用于高拉伸强度)吸收扭转和拉伸应力，防止这些力到达内电缆芯。松套管结构本身提供固有的应变释放——当电缆被拉动时，管可以略微伸长，而光纤在凝胶填充环境中保持无应力状态。

During breakout, when fibers are routed individually, the aramid yarn strength members in the furcation tubing take all tensile loads. Proper termination practices include securely clamping the aramid yarn to the connector housing or patch panel, creating a mechanical anchor point that ensures pulling forces never reach the fiber. The gel compound within the loose tube also provides damping for vibrations and shock loads.

在分支期间，当光纤单独布线时，分支管中的芳纶纤维强度构件承担所有拉伸负载。适当的终端实践包括将芳纶纤维牢固地夹紧到连接器外壳或配线架，创建机械锚点，确保拉力永远不会到达光纤。松套管内的凝胶化合物还为振动和冲击负载提供阻尼。

Strain Relief Considerations for Generic Cables 通用电缆的应变释放考虑

Generic (N)TSCGEWÖU-FO cables using tight buffer construction rely primarily on the 900 μm buffer coating and the cable’s overall strength members for strain relief. While the thicker buffer provides good protection against bending and handling stresses, the fiber is more mechanically coupled to the buffer material compared to loose tube designs. This means that excessive cable tension can potentially transmit stress to the fiber, particularly if the cable experiences temperature extremes that cause differential thermal expansion between the buffer and the glass fiber.

使用紧套管结构的通用(N)TSCGEWÖU-FO电缆主要依靠900微米缓冲涂层和电缆的整体强度构件进行应变释放。虽然较厚的缓冲层提供了良好的抗弯曲和处理应力保护，但与松套管设计相比，光纤与缓冲材料的机械耦合更多。这意味着过度的电缆张力可能会向光纤传递应力，特别是如果电缆经历导致缓冲层和玻璃光纤之间差异热膨胀的极端温度。

Installation best practices for tight buffer cables include avoiding excessive pulling tension (typically limited to 600 N for standard cables), maintaining minimum bend radius requirements (usually 10 times cable diameter under load), and using proper strain relief boots at all termination points. The advantage is that these cables are generally more forgiving of installation errors and less susceptible to damage from rough handling during installation.

紧套管电缆的安装最佳实践包括避免过度牵引张力(标准电缆通常限制为600 N)，保持最小弯曲半径要求(负载下通常为电缆直径的10倍)，并在所有终端点使用适当的应变释放靴。优点是这些电缆通常对安装错误更宽容，在安装期间受粗暴处理造成损坏的可能性更小。

Application-Specific Recommendations 特定应用建议

When to Specify RHEYFIRM®-FO 何时指定RHEYFIRM®-FO

Nexans RHEYFIRM®-FO cables with their interstices fiber accommodation and loose tube protection are engineered for the most demanding applications. Specify these cables when your application involves high-speed reeling operations (approaching or exceeding 240 m/min), extreme environmental conditions with significant temperature fluctuations (such as outdoor port cranes exposed to both freezing winters and hot summers), automated systems where downtime for fiber failure is unacceptable, or installations where the fiber must maintain signal integrity over many years of continuous dynamic operation.

Nexans RHEYFIRM®-FO电缆及其间隙光纤容纳和松套管保护是为最苛刻的应用而设计的。在以下情况下指定这些电缆：您的应用涉及高速卷取操作(接近或超过240米/分钟)，具有显著温度波动的极端环境条件(如暴露于寒冷冬季和炎热夏季的户外港口起重机)，光纤故障导致停机时间不可接受的自动化系统，或光纤必须在多年连续动态操作中保持信号完整性的安装。

The premium cost is justified by the superior mechanical protection, proven long-term reliability in port operations worldwide, and reduced maintenance requirements over the cable’s operational lifetime. Total cost of ownership calculations typically favor premium cables in high-utilization crane applications where fiber failures result in costly downtime.

优质成本是合理的，因为其在全球港口操作中具有优越的机械保护、经过验证的长期可靠性，以及在电缆运行寿命期间减少的维护要求。总拥有成本计算通常有利于高利用率起重机应用中的高端电缆，其中光纤故障导致昂贵的停机时间。

When Generic (N)TSCGEWÖU-FO May Suffice 通用型何时足够

Generic (N)TSCGEWÖU-FO cables can be appropriate for moderate-duty applications with lower operational speeds (under 120 m/min), installations where easier breakout and termination procedures are prioritized, backup or redundant fiber runs where some reduced service life is acceptable, or budget-constrained projects where initial cost is the primary consideration.

通用(N)TSCGEWÖU-FO电缆可能适用于具有较低操作速度(低于120米/分钟)的中等负荷应用，优先考虑更容易分支和端接程序的安装，可以接受一些减少的使用寿命的备份或冗余光纤运行，或初始成本是主要考虑因素的预算受限项目。

It is crucial to verify the specific construction method (loose tube vs. tight buffer) and obtain manufacturer documentation on the fiber integration design before finalizing specifications. Not all generic cables perform equally, and the DIN VDE standard permits significant design latitude.

在最终确定规格之前，验证特定的结构方法(松套管与紧套管)并获取制造商关于光纤集成设计的文档至关重要。并非所有通用电缆性能相同，DIN VDE标准允许显著的设计自由度。

Installation & Maintenance Considerations 安装与维护考虑

Long-Term Performance Monitoring 长期性能监测

Optical fiber systems in crane applications should be periodically tested using an Optical Time Domain Reflectometer (OTDR) to detect any degradation in fiber integrity. Increased attenuation or the appearance of reflective events can indicate developing problems before complete fiber failure occurs. Nexans RHEYFIRM® cables with their robust protection typically show minimal degradation over decades of operation. Generic cables should be monitored more frequently, particularly in high-stress applications, to ensure they continue to meet performance requirements.

起重机应用中的光纤系统应使用光时域反射仪(OTDR)定期测试，以检测光纤完整性的任何退化。衰减增加或反射事件的出现可以在完全光纤失效发生之前指示正在发展的问题。Nexans RHEYFIRM®电缆及其坚固的保护通常在数十年的操作中显示最小的退化。通用电缆应该更频繁地监测，特别是在高应力应用中，以确保它们继续满足性能要求。

Authoritative Sources & Technical Standards 权威来源与技术标准

1. Nexans RHEYFIRM® RTS (N)TSCGEWTOEUS OFE Technical Documentation: Detailed specification of interstices fiber accommodation design and construction methodology.
Source: CSE Industrial Electrical Distributors

2. Nexans Crane Cable Technical Specifications: Comprehensive construction details for RHEYFIRM series including fiber optic integration in reeling applications.
Source: Nexans Crane Cable Documentation

3. Corning Optical Communications: Loose Tube vs. Tight-Buffered Cable in Outdoor/OSP Applications – authoritative technical comparison of fiber protection methodologies.
Source: Corning AEN026 Technical Paper

4. Timbercon Technical Resources: Construction differences between loose tube and tight-buffered fiber optic cables with application guidance.
Source: Timbercon Fiber Optics

5. FS.com Technical Specifications: Detailed comparison of tight-buffered cable versus loose-tube gel-filled cable constructions and performance characteristics.
Source: FS.com Technical Blog

6. DIN VDE 0250-813 Standard: German national standard for medium voltage trailing cables including specifications for fiber optic integration (3.6/6 kV to 18/30 kV).

7. DIN VDE 0888: German standard specifically addressing optical fiber cables and components in power cables.

8. Wikipedia: Fiber-optic Cable – Technical overview of cable construction including breakout cable design and strain relief methodologies.
Source: Wikipedia