PROTOLON(IQ) 3.6/6 kV, 6/10 kV, 8.7/15 kV, 12/20 kV: Medium Voltage Reeling Cable with Integrated Sensor Fiber
PROTOLON(IQ) is a flexible medium voltage reeling cable concept for gantry cranes, automated stacking cranes, ship loaders, mobile mining machines and other large travelling equipment exposed to high or extreme mechanical loads. Its engineering difference is not only a stronger rubber sheath or a more flexible conductor. The cable combines class FS very finely stranded tinned copper, EPR-based medium voltage field control, PROTOFIRM sandwich sheathing, polyester anti-torsion reinforcement and a special single-mode sensor fiber into one reelable cross-section. This allows the cable itself to become a monitored mechanical and thermal component, supporting predictive maintenance instead of relying only on visual inspection after damage has already started.
Definition and engineering positioning
1. What is PROTOLON(IQ)?
PROTOLON(IQ) (N)TSKCGEWOEU is a flexible medium voltage rubber reeling cable with an integrated sensor fiber for real-time detection and analysis of mechanical and thermal cable stress during gantry operation. The design is based on DIN VDE 0250-813 and is intended for high to extreme mechanical loads: high travel speeds, dynamic tensile forces, frequent directional changes across multiple planes, repeated running over rollers and torsional stress.
For harbour engineers, terminal maintenance teams and mining equipment designers, the important point is simple: this is not only a power cable. It is a monitored power-delivery component. The sensor fiber gives the cable a diagnostic layer, allowing mechanical strain and thermal overload patterns to be observed before they become insulation damage, sheath tearing, conductor fatigue or unplanned crane stoppage.
Technical thesis
Engineering argument: conventional reeling cable maintenance is often reactive: inspect the sheath, measure insulation resistance, repair visible damage and replace the cable after repeated incidents. PROTOLON(IQ) changes the maintenance philosophy. By integrating a sensor fiber into a medium voltage reeling cable, the machine owner gains a signal path for observing cable stress while the machine is operating. In applications where downtime of a ship loader, gantry crane or automated stacking crane can disrupt an entire terminal operation, the value is not merely cable life extension; it is earlier fault recognition and more planned maintenance windows.
1.1 Application profile decoded for port and mining engineers
| Application dimension | Published technical description | Engineering meaning |
|---|---|---|
| Cable category | Flexible medium voltage reeling cable with integrated sensor fibre | One cable supplies MV power and provides a diagnostic sensing path for cable condition monitoring. |
| Primary motion profile | Gantry operations | Designed around long-travel machines with motorized reels, not static cable routing. |
| Mechanical load class | High to extreme mechanical loads | Suitable for the severe duty zone of ports, bulk terminals and open-pit mining machines. |
| Travel speed | Gantry reeling operation up to 240 m/min | Matches fast-moving cranes and automated stacking equipment where cable pick-up speed is a design constraint. |
| Dynamic forces | Dynamic tensile forces and frequent directional changes | Reel torque, acceleration, braking and cable guidance geometry must be calculated together. |
| Roller exposure | Churning over rollers | Outer sheath, inner sheath and reinforcement must resist local compression, abrasion and repeated bending. |
| Torsional duty | Torsional stress during multi-plane movement | Anti-torsion braid and cable lay-up protect the core geometry from twist accumulation. |
| Target machines | Fast-moving gantry cranes, automated stacking cranes, ship loaders and similar systems | Typical search terms: gantry crane reeling cable, ship loader cable, ASC crane cable, port machinery cable, mining reeling cable. |
Cable designation and global data
2. Brand, Type Designation and Standards Basis
The global data identifies the brand as PROTOLON(IQ) and the type designation as (N)TSKCGEWOEU. The construction is based on DIN VDE 0250-813, a key reference point for heavy-duty rubber-insulated and rubber-sheathed medium voltage reeling cables. For engineers comparing alternative crane cable proposals, the standard reference is important because it separates a purpose-designed MV reeling cable from a general-purpose flexible MV cable that may not survive reel, roller and torsion duty.
| Item | Technical value | Why it matters in specification |
|---|---|---|
| Brand | PROTOLON(IQ) | Identifies the cable family with integrated intelligence / sensing function. |
| Type designation | (N)TSKCGEWOEU | Indicates a heavy-duty medium voltage rubber reeling cable construction with combined functional elements. |
| Standard basis | Based on DIN VDE 0250-813 | Provides the engineering foundation for MV reeling cable design and comparison. |
| Rated voltage classes | 3.6/6 kV, 6/10 kV, 8.7/15 kV, 12/20 kV | Supports common port, industrial and mining MV supply levels. |
| Current-carrying capacity reference | According to DIN VDE 0298, Part 4 | Connects ampacity calculation to a recognised cable-rating method. |
| Bending radius reference | According to DIN VDE 0298, Part 3 | Ensures reel drum, rollers and cable guides are sized from recognised bending rules. |
| Oil resistance reference | According to DIN EN 60811-404 and DIN VDE 0473-811-404, paragraph 10 | Relevant for hydraulic oil, lubricant contamination and industrial quay environments. |
Layer-by-layer construction
3. Construction Analysis: Why the Cable is Flexible, Tensile-Resistant and Abrasion-Resistant
The mechanical performance of a high-flexible mining and harbour reeling cable is not created by one material alone. It comes from the interaction of conductor stranding, field-control elasticity, core arrangement, inner sheath geometry, anti-torsion reinforcement and outer sheath compound. PROTOLON(IQ) uses a layered design in which each component has a defined mechanical and electrical function.
Design argument: flexibility without losing geometry
Engineering argument: many cables can be made flexible by using fine conductors. Far fewer remain stable under the combined effects of dynamic tension, roller pressure and torsion. The PROTOLON(IQ) construction addresses this by pairing class FS conductors with a stabilising inner sheath and an anti-torsion braid. This prevents flexibility from becoming internal looseness. For mining reels and harbour gantry cranes, that distinction is critical: a cable that bends easily but allows internal elements to migrate will fail by conductor fatigue, sensor fiber stress or sheath deformation long before its electrical rating is exhausted.
Electrical parameters
4. Electrical Parameters Across 3.6/6 kV to 12/20 kV Classes
The electrical rating table is a direct selection tool for MV system engineers. It shows the rated voltage U0/U, maximum permissible operating voltage and AC test voltage for each voltage class. For port projects, the most common engineering check is whether the machine supply level, maximum system voltage and test-voltage requirements match the selected cable class before mechanical sizing begins.
| Rated voltage U0/U (kV) | Max. permissible operating voltage AC (kV) | Max. permissible operating voltage DC (kV) | AC test voltage (kV) | Engineering interpretation |
|---|---|---|---|---|
| 1.8/3 | 2.1/3.6 | 2.7/5.4 | 6 | Lower MV class for systems below the main article voltage range. |
| 3.6/6 | 4.2/7.2 | 5.4/10.8 | 11 | Suitable for 6 kV class mobile equipment power distribution. |
| 6/10 | 6.9/12 | 9/18 | 17 | Common MV class for crane, terminal and heavy industrial mobile equipment. |
| 8.7/15 | 10.4/18 | 13.5/27 | 24 | Higher MV supply class for larger machines and longer power-feeding distances. |
| 12/20 | 13.9/24 | 18/36 | 29 | 20 kV class applications where higher voltage reduces current and voltage drop. |
Medium voltage insight
Engineering argument: the voltage class is not only a nameplate value. It defines insulation thickness, field-control requirements, termination practice, test voltage and the operating margin against overvoltage. On moving equipment, every electrical interface is also a mechanical interface. This is why the EPR semiconductive field-control system and Easy Strip outer semiconductive layer are not minor construction details; they directly influence whether the cable can be terminated repeatedly and reliably under maintenance conditions.
Sensor fiber and data capability
5. Integrated Sensor Fiber: From Cable Supply to Cable Intelligence
The defining element of PROTOLON(IQ) is the special single-mode sensor fiber used to monitor mechanical and thermal cable conditions. In addition, the data transmission design can integrate up to 24 fiber optics, with single-mode E9 or multimode G62.5 / G50 options. This is particularly relevant to automated ports, because the same cable route often has to support power supply, diagnostic signals and data requirements for remote operation and condition monitoring.
| Fiber-related feature | Technical statement | Engineering value |
|---|---|---|
| IQ sensor fiber | Special single-mode sensor fiber for monitoring mechanical and thermal cable conditions | Enables condition monitoring during actual gantry operation, not only scheduled shutdown inspection. |
| Data transmission capacity | Integration with up to 24 fiber optics | Supports monitoring, communication redundancy and future terminal automation expansion. |
| Fiber types | Single-mode E9 or multimode G62.5 / G50 | Allows matching the cable to the terminal network design and required transmission distance. |
| Electrical immunity | Optical fiber is dielectric | Sensor and communication signals are not degraded by electromagnetic fields from MV conductors. |
| Maintenance relevance | Mechanical and thermal stress can be detected and analysed | Supports predictive maintenance and reduces unplanned downtime risk. |
5.1 Why sensor fiber matters in harbour and mining applications
A harbour reeling cable rarely fails because one parameter is wrong in isolation. Failures usually come from combinations: a slightly undersized roller, a high acceleration profile, contaminated sheaves, repeated twist, elevated conductor temperature and sheath abrasion. The sensor fiber makes these combined stress patterns more visible. For a port engineer searching for gantry crane cable condition monitoring, ship loader reeling cable predictive maintenance or medium voltage cable with integrated sensor fiber, this is the key advantage over a conventional power-only cable.
Mechanical and thermal parameters
6. Mechanical and Thermal Performance: Tensile Load, Travel Speed and Temperature Limits
The mechanical parameters show that PROTOLON(IQ) is designed for real moving-machine duty, not only flexible connection. The maximum tensile load on the conductor is 20 N/mm² static and 30 N/mm² dynamic. Gantry reeling operation is specified up to 240 m/min. The conductor can operate continuously at 90°C and withstand 250°C during short-circuit conditions.
| Parameter | Value / reference | Engineering significance |
|---|---|---|
| Maximum tensile load, static | 20 N/mm² on the conductor | Used for steady-state reel tension and hanging cable sections. |
| Maximum tensile load, dynamic | 30 N/mm² on the conductor | Used for acceleration, braking, reel torque peaks and shock-like events. |
| Bending radii | According to DIN VDE 0298, Part 3 | Defines reel drum, guide roller and moving cable path minimum geometry. |
| Travel speed | Gantry reeling operation up to 240 m/min | Supports fast-moving gantry cranes, ASCs and ship loaders. |
| Maximum conductor temperature | 90°C | Continuous operating limit for the EPR insulation system. |
| Maximum short-circuit conductor temperature | 250°C | Short-time thermal withstand basis for protection coordination. |
| Fixed installation ambient range | -50°C to +80°C | Relevant for static cable sections and parked equipment in cold climates. |
| Fully flexible operating ambient range | -35°C to +80°C | Relevant for actual moving reel and gantry operation. |
Mechanical argument
Engineering argument: the 20/30 N/mm² tensile rule is especially important for long-travel machines. A cable may look correctly sized electrically, yet be mechanically underspecified if reel tension, acceleration peaks and cable self-weight are ignored. In practical port engineering, the cable cross-section should therefore be verified three times: for load current, for voltage drop and for dynamic tensile load. The integrated sensor fiber then adds a fourth layer: monitoring whether the installed system is actually operating within the intended stress envelope.
Environmental and chemical resistance
7. Outer Sheath Engineering: Abrasion, Tear, Oil, UV, Ozone and Moisture Resistance
In mining and port machinery, the outer sheath determines practical service life more often than the conductor does. The PROTOLON(IQ) outer sheath is specified as PROTOFIRM, an abrasion and tear-proof high-grade rubber compound based on PCP, better than 5GM5. The cable is suitable for unrestricted outdoor and indoor use and is resistant to ozone, UV and moisture. Oil resistance is specified according to DIN EN 60811-404 and DIN VDE 0473-811-404, paragraph 10.
| Exposure | Specified design answer | Why it matters |
|---|---|---|
| Abrasion | PROTOFIRM abrasion-resistant PCP outer sheath, better than 5GM5 | Protects against rollers, quay surfaces, drag zones, mining dust and mechanical scraping. |
| Tearing | Tear-proof high-grade rubber compound | Prevents local cuts from propagating into full sheath failure. |
| Oil | Resistance according to DIN EN 60811-404 and DIN VDE 0473-811-404 | Important near hydraulic systems, gearboxes, lubricated moving parts and contaminated quay areas. |
| Weather | Unrestricted use outdoors and indoors | Allows one cable design for open quay, stockyard and machine-house transitions. |
| Ozone | Ozone resistant | Reduces cracking risk in electrical and industrial environments. |
| UV | UV resistant | Supports long-term outdoor exposure without rapid surface ageing. |
| Moisture | Moisture resistant | Important for ports, coastal projects, rain exposure and wet mining environments. |
Comparison and evaluation
8. Comparative Evaluation: PROTOLON(IQ) vs Conventional Medium Voltage Reeling Cable
The most meaningful comparison is not only material-to-material. It is system-to-system: a conventional medium voltage reeling cable is selected to survive mechanical movement and carry power; PROTOLON(IQ) is selected to survive mechanical movement, carry power and report stress information that supports maintenance decisions.
| Comparison item | Conventional MV reeling cable | PROTOLON(IQ) MV reeling cable | Engineering reading |
|---|---|---|---|
| Primary function | Medium voltage power transmission | Medium voltage power plus integrated sensor fiber monitoring | PROTOLON(IQ) adds a diagnostic layer inside the cable cross-section. |
| Maintenance mode | Mainly inspection-based and reactive | Supports real-time stress detection and predictive maintenance | More suitable for automated terminals where unplanned downtime is costly. |
| Mechanical design | Flexible and reelable depending on construction | Class FS conductor, sandwich inner sheath and reinforced polyester anti-torsion braid | The cable is engineered for high to extreme mechanical load and geometry stability. |
| Sheath performance | Depends on compound and duty class | Abrasion and tear-proof PCP outer sheath better than 5GM5 | Higher relevance to harsh quay, mining and roller environments. |
| Condition feedback | Usually external inspection only | Sensor fiber monitors mechanical and thermal cable condition | Stress can be identified before visible sheath or insulation damage dominates. |
| Data / fiber option | Often separate communication cable if required | Up to 24 fiber optics; single-mode E9 or multimode G62.5/G50 | Reduces the need for separate cable routes where optical functions are required. |
8.1 Comparison for harbour engineers: why this matters on gantry cranes and ship loaders
Harbour engineers typically search for solutions using equipment-driven terms: gantry crane reeling cable, ship loader medium voltage cable, port crane cable with fiber optic monitoring, ASC crane cable predictive maintenance and high-speed cable reel cable. In these applications, the cable is not a passive accessory. It is a moving machine component exposed to acceleration, wind, salt mist, roller pressure, misalignment and schedule pressure. A monitored cable design is therefore especially valuable where maintenance windows are limited and crane availability directly affects vessel turnaround time.
Honest engineering boundary
Engineering argument: integrated sensor fiber does not remove the need for correct reel design, bending-radius control or tensile calculation. It strengthens the maintenance strategy only after the mechanical system has been correctly designed. The cable should still be selected according to voltage class, load current, bending geometry, travel speed, tensile load, environmental exposure and termination quality. The IQ function then provides operating feedback that a power-only cable cannot provide.
Selection framework
9. How to Specify a PROTOLON(IQ) Cable for Port, Mining and Bulk-Handling Projects
A technically complete specification should not stop at voltage and conductor size. For a high-flexible mining cable or a harbour gantry reeling cable, the specification must connect the electrical system, mechanical path, environmental exposure and monitoring concept.
| Selection dimension | What to confirm | Decision it drives |
|---|---|---|
| Voltage class | 3.6/6 kV, 6/10 kV, 8.7/15 kV or 12/20 kV system requirement | Determines insulation system, test voltage and termination class. |
| Load current | Continuous current, duty cycle, ambient temperature and installation method | Selects conductor cross-section using DIN VDE 0298 Part 4 as reference. |
| Dynamic tension | Acceleration, braking, reel torque, cable self-weight and emergency stop conditions | Checked against 20 N/mm² static and 30 N/mm² dynamic conductor tensile rules. |
| Bending geometry | Reel drum, guide rollers, reverse bends and route transitions | Must follow DIN VDE 0298 Part 3 bending-radius requirements. |
| Travel speed | Maximum gantry speed and reel pick-up / pay-out speed | Checked against gantry reeling operation up to 240 m/min. |
| Torsion exposure | Multi-plane cable route, twist accumulation, roller alignment and reel mounting | Confirms the need for reinforced anti-torsion braid and stable lay-up. |
| Environmental exposure | Oil, UV, ozone, moisture, dust, salt mist, stone particles and abrasion | Confirms suitability of PCP PROTOFIRM outer sheath better than 5GM5. |
| Sensor / fiber concept | Monitoring objective, fiber type, number of fibers, termination and diagnostic equipment | Defines the IQ sensing strategy and any data-transmission reserve. |
| Maintenance strategy | Inspection interval, alarm thresholds, spare cable philosophy and downtime window | Turns sensor information into practical predictive maintenance actions. |
Engineering FAQ
10. Frequently Asked Engineering Questions
Question 1 — What is PROTOLON(IQ) (N)TSKCGEWOEU?
Answer: It is a flexible medium voltage reeling cable with integrated sensor fiber, designed for real-time detection and analysis of mechanical and thermal stress during gantry operation. It is suitable for high to extreme mechanical loads on large mobile equipment such as gantry cranes, automated stacking cranes and ship loaders.
Question 2 — Which voltage classes are covered?
Answer: The main voltage classes are 3.6/6 kV, 6/10 kV, 8.7/15 kV and 12/20 kV. The electrical parameter table also includes the corresponding maximum permissible operating voltages and AC test voltages for engineering selection.
Question 3 — What is the role of the IQ sensor fiber?
Answer: The special single-mode sensor fiber is used for monitoring the mechanical and thermal condition of the cable. It helps detect stress trends during operation, supporting predictive maintenance and reducing the risk of unplanned downtime.
Question 4 — Why is EPR insulation important in this cable?
Answer: The PROTOLON HS insulation is a high-grade EPR-based compound better than 3GI3. EPR is well suited to flexible medium voltage cables because it combines electrical insulation performance with rubber elasticity and dynamic bending resistance.
Question 5 — What makes the cable abrasion-resistant?
Answer: The outer sheath is a PROTOFIRM high-grade rubber compound based on PCP, specified as abrasion and tear-proof and better than 5GM5. This sheath design is critical for rollers, quay surfaces, mining dust, dragged cable sections and harsh outdoor exposure.
Question 6 — What mechanical limits should be checked?
Answer: Key checks include static tensile load of 20 N/mm², dynamic tensile load of 30 N/mm², bending radii according to DIN VDE 0298 Part 3 and gantry reeling operation up to 240 m/min. Torsion, roller churning and frequent directional changes should be reviewed at project level.
Question 7 — Is this cable only for ports?
Answer: No. The application profile also fits mining and bulk-handling machines where medium voltage power must be supplied through a moving reel under high tensile, abrasion and torsional stress. Typical examples include mobile mining equipment, ship loaders, automated stacking cranes and similar systems requiring continuous cable condition monitoring.
Feichun Engineering View
PROTOLON(IQ) represents a high-flexible, tensile-resistant and abrasion-resistant medium voltage reeling cable architecture for harsh moving-machine duty. Its core engineering value is the combination of class FS very finely stranded tinned copper conductors, EPR-based medium voltage field control, PROTOLON HS insulation, Easy Strip modified NBR semiconductive layer, special single-mode IQ sensor fiber, cradle-separated three-core geometry, PROTOFIRM sandwich inner sheath, reinforced polyester anti-torsion braid and PROTOFIRM PCP outer sheath better than 5GM5. For harbour cranes, automated stacking systems, ship loaders and mining reels, the cable should be specified as a complete system: voltage class, test voltage, current-carrying capacity, bending radius, tensile load, travel speed, torsion, sheath environment and sensor fiber monitoring must be verified together. The result is a cable that does not merely carry power across a moving machine; it helps the operator understand how that cable is being stressed in service.
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