Type YHKGXSFpyn 3.6/6 kV Screened mining cables
Mining power cable with individual shield and copper core,
XLPE insulation, PVC sheath, steel wire armor SWA ARMOR
Flat steel, flame retardant PVC sheath
These mining cables are specially designed for underground power distribution in mining operations.
They are built to operate at a rated voltage up to 6 kV and can be used in both methane and non-methane environments—even in areas with explosion hazards (due to methane or coal dust).
Their rugged construction makes them suitable for installation in steep shafts (over 45°) and harsh underground conditions.
Construction Details
Conductor:
Material: Copper
Type: Multi-stranded, round, and compacted (Class 2 as per EN 60228)
Conductor Shielding:
Working Conductor Screen: A layer on the conductors made from either conductive tape or a polyethylene-based material.
Individual Conductor Shield: Each conductor is wrapped individually using either:
Conductive tape combined with copper tape, or
Conductive polyethylene combined with copper tape.
Insulation:
Material: XLPE (cross-linked polyethylene)
Standard: Type DIX 3 according to PN-HD 620 S1:2002
Central Assembly:
The working conductors are twisted around a core (which may be a copper wire or strand).
Filler Material:
Uses unvulcanized rubber or a tire-derived polyvinyl compound to fill spaces and maintain the cable’s shape.
Sheathing:
Inner Sheath: Made of PVC (type DMV 31, PN-HD 620 S1:2002)
Armor: A protective layer of flat zinc-coated steel (FeZn) wires.
Outer Sheath: A flame-retardant PVC layer (also DMV 31 per PN-HD 620 S1:2002) with a red color.
Performance Characteristics
Operating Temperatures:
Normal Operation: Conductor temperature up to +90°C.
Ambient Temperature: Minimum of –30°C for permanently laid cables.
Installation Temperature: Can be laid at –50°C if no heating is applied.
Short-Circuit: Conductor temperature may rise up to +250°C.
Bending Radius:
Minimum bending radius is 12 times the overall cable diameter (12 x D).
Electrical Testing:
Test Voltage: 15 kV AC applied for 5 minutes at 50 Hz.
Flame Resistance:
Meets IEC standards (IEC 60332-1-2 and IEC 60332-3-24C) for flame propagation.
Mechanical Strength:
Maximum tensile strength is calculated as 50 times the total cross-sectional area of the working conductors (in mm²).
Packaging Options:
Standard lengths are available on drums of 500 or 1000 meters, with custom lengths and packaging also offered.
Applications
Usage: Designed for underground mining power networks with voltages up to 6 kV.
Hazard Areas: Suitable for both methane and non-methane areas, including zones classified as “a,” “b,” or “c” (for explosion hazards in methane-class A or coal dust environments).
Installation: Armored versions (with round or flat steel wires) are ideal for use in shafts and sloping galleries exceeding a 45° incline.
Certifications & Approvals
Certifications: Approved by EMAG and WUG.
Environmental Compliance: RoHS compliant.
Additional Temperature Range Note: Some components are rated for a maximum of +90°C and a minimum of –5°C.
Cable Variants & Electrical Data
The cables come in different sizes (for example, 3x25/25, 3x35/25, 3x50/25, etc.). For each variant, detailed specifications include:
Conductor Size: Number of conductors and their rated cross-sectional areas (in mm²)
Layer Thicknesses: Nominal thicknesses for insulation, inner sheath, and armor.
Dimensions & Weight: Approximate overall cable diameter and weight per kilometer.
Conductor Resistance: Maximum resistance at 20°C (expressed in Ω/km).
A separate table provides electrical characteristics such as:
Current-Carrying Capacity (Ampacity): At an ambient temperature of +25°C.
Unit Inductance: Measured in mH/km.
Unit Inductive Reactance: Measured in Ω/km.
Derating Factors
Parallel Installation:
When multiple cables are installed together (stacked on supports), the current-carrying capacity must be derated:
1 cable: Factor 1.00
2 cables: Factor 0.93
3 cables: Factor 0.90
6 cables: Factor 0.87
9 cables: Factor 0.86
Ambient Temperature Above +25°C:
For cables with a long-term operating temperature of +90°C, the ampacity must be adjusted based on ambient temperature:
30°C: Factor 0.96
35°C: Factor 0.92
40°C: Factor 0.88
45°C: Factor 0.83
50°C: Factor 0.78
55°C: Factor 0.73
Summary
The Type YHKGXSFpyn 3.6/6 kV Screened Mining Cables are robust, flame-retardant power cables designed for the demanding conditions of underground mining. They feature high-quality copper conductors, advanced XLPE insulation, multiple layers of shielding, and steel wire armor, ensuring safe, reliable operation in hazardous environments. Detailed electrical and mechanical specifications, along with built-in correction factors for different installation conditions, make these cables a dependable choice for mining applications.
Feel free to ask if you need any more details or further clarifications!
Frequently Asked Questions (FAQ)
Q: What is the primary application of these cables?
A: They are designed for underground power distribution in mining operations, including both methane and non-methane environments, ensuring safe operation in hazardous areas.
Q: What is the rated voltage of the cable?
A: The cable is rated for use up to 6 kV, making it suitable for various mining electrical systems.
Q: What conductor material is used in these cables?
A: The conductors are made of high-quality copper, ensuring excellent conductivity and durability.
Q: What type of insulation does the cable have?
A: The cable uses XLPE (cross-linked polyethylene) insulation, type DIX 3, which offers superior thermal and chemical resistance.
Q: Is the cable suitable for use in methane and explosive atmospheres?
A: Yes, it is specifically engineered for both methane and non-methane areas, including zones with potential explosion hazards due to methane or coal dust.
Q: How is individual conductor shielding achieved?
A: Each conductor is individually shielded using either a combination of conductive tape and copper tape or a conductive polyethylene layer with copper tape, providing enhanced electrical performance and noise reduction.
Q: What type of armor does the cable have?
A: The cable features a steel wire armor (SWA) made of flat zinc-coated steel wires, which protects it against mechanical damage and harsh mining conditions.
Q: Can the cable be used in inclined or steep mining shafts?
A: Absolutely. Its robust design, including a flat steel armor, makes it suitable for installation in steep shafts and galleries with inclinations over 45°.
Q: What are the operating temperature limits for this cable?
A: The cable is designed to operate with a conductor temperature up to +90°C, an ambient temperature as low as –30°C for permanently laid cables, and it can be installed at temperatures down to –50°C without preheating. During short-circuit conditions, the conductor temperature may reach up to +250°C.
Q: What flame retardant standards does this cable meet?
A: It complies with IEC 60332-1-2 and IEC 60332-3-24C standards, ensuring excellent flame retardant properties in critical mining environments.
Q: What are the standard packaging lengths available?
A: The cables are typically supplied on drums in lengths of 500 or 1000 meters, with the possibility of custom lengths and packaging as per project requirements.
Q: How does the cable's construction contribute to its durability?
A: The combination of a copper conductor, robust XLPE insulation, individual and overall conductor shields, and steel wire armor provides mechanical strength and long-term reliability even in harsh underground conditions.
Q: What certifications does the cable have?
A: The cable holds certifications from bodies such as EMAG and WUG, and it is also RoHS compliant, ensuring it meets environmental and safety standards.
Q: What is the minimum bending radius for these cables?
A: The cable has a minimum bending radius of 12 times its overall diameter (12 x D), ensuring that bending during installation does not damage the internal structure.
Q: How is the cable tested electrically before installation?
A: It undergoes a high-voltage test of 15 kV AC for 5 minutes at 50 Hz, ensuring insulation integrity and overall performance.
Q: Can the cable be installed in bundles, and are there any derating factors?
A: Yes, multiple cables can be installed together. However, the current-carrying capacity must be derated using specified correction factors based on the number of cables in parallel.
Q: How does ambient temperature affect the cable’s current-carrying capacity?
A: The cable’s ampacity is reduced at higher ambient temperatures. Correction factors are provided (for example, a factor of 0.96 at 30°C and 0.73 at 55°C) to adjust for the increased operating temperature.
Q: What benefits does XLPE insulation offer in mining applications?
A: XLPE insulation provides excellent thermal resistance, chemical stability, and mechanical durability, making it ideal for the demanding conditions found in underground mining.
Q: What conductor configurations are available for this cable?
A: The cable is available in various conductor sizes such as 3x25/25, 3x35/25, 3x50/25, and more, allowing selection based on specific current-carrying requirements.
Q: How is the cable designed to withstand mechanical stress?
A: Its robust construction, including the individual shielding, central conductor assembly, and the steel wire armor, ensures high mechanical strength and resistance to physical stresses such as impact, bending, and abrasion.
Q: What is the role of the filler and inner sheath in the cable construction?
A: The filler (made from unvulcanized rubber or tire-derived polyvinyl compounds) and the PVC inner sheath help maintain the cable's round shape, protect the conductors, and provide additional insulation.
Q: How does the cable's design ensure safety during short-circuit events?
A: The cable is engineered to handle short-circuit conditions, with a conductor temperature rating up to +250°C during such events, ensuring that it maintains structural integrity and electrical performance under fault conditions.
Type YHKGXSFpyn 3.6/6 kV Screened mining cables
Type YHKGXSFtlyn 3.6/6 kV Screened Mining Cable – a robust, high-Type YHKGXSFpyn 3.6/6 kV Screened Mining Cable—a robust, reliable power cable designed specifically for the harsh environments of underground mining. Built with high-quality multi-stranded copper conductors, it features advanced XLPE insulation and individual conductor shielding to ensure safe and efficient power transmission, even in methane or explosive atmospheres. The cable’s durable construction includes a PVC inner sheath, flame-retardant outer sheath, and a steel wire armor layer, providing excellent mechanical protection and thermal stability. Ideal for use in steep shafts and challenging installations, this cable meets rigorous industry standards, ensuring long-term performance and safety in critical mining applications.
6/30/20216 min read