Type YRUHKGXSekFpyn 3.6/6 kV Mining Power cables
Flame retardant cross-linked polyethylene insulated power cable for mining, individually shielded, copper core,
PVC sheath, radial seal, overall shield, flat steel wire armor,
longitudinal seal, flame retardant PVC sheath
The Type YRUHKGXSekFpyn cable is a flame-retardant, cross-linked polyethylene (XLPE) insulated power cable specifically engineered for mining applications.
It is designed to deliver reliable, safe, and robust performance in harsh underground environments, particularly where there is a risk of methane or coal dust explosions.
The cable complies with the ZN-TF 203:2006 standard and is intended for use in low-voltage systems.
Construction and Materials
1. Conductor and Screening
Conductor:
The cable features multi-stranded, round copper conductors that are compacted to Class 2 in accordance with EN 60228, ensuring excellent conductivity and flexibility.
Working Conductor Screening:
Each working conductor is provided with an individual shield. This is achieved either with conducting tape or with a conductive polyethylene compound combined with copper tape, which helps to reduce electrical interference.
Overall Shielding:
Beyond the individual screening, an overall shield is applied. This is typically achieved with a continuous copper tape wrap that surrounds the entire cable core.
2. Insulation and Internal Layers
XLPE Insulation:
The cable’s insulation is made from flame-retardant cross-linked polyethylene (XLPE) of type DIX 3, meeting the requirements of PN-HD 620 S1:2002.
Filling Layer:
A filling compound, based on unvulcanized rubber or a tire-grade polwinit, is used to fill the space and enhance mechanical integrity.
Inner Sheath:
Over the insulation, a PVC inner sheath (type DMV 31 per PN-HD 620 S1:2002) is applied to protect the insulation layer.
Radial Sealing:
To prevent moisture ingress, a radial sealing layer is provided using an aluminum/PVC tape.
3. Additional Layers and Armor
Separating Layers:
A PVC separating layer (again, type DMV 31) is used between the radial seal and the overall shield, and another layer is placed between the overall shield and the armor.
Longitudinal Sealing:
A water-swelling (expanding) tape is applied along the cable’s length to provide additional sealing against water and moisture.
Armor:
The cable is mechanically protected by a layer of flat steel wires. This flat steel wire armor is crucial for withstanding the physical stresses commonly encountered in mining operations.
Outer Sheath:
The final external layer is a flame-retardant PVC (tire compound type DMV 31) sheath, which is typically red. This outer sheath provides extra protection against mechanical damage and flame propagation.
Key Characteristics
Temperature Ratings:
Operating Temperature: Maximum conductor temperature during normal operation is +90°C.
Ambient Temperature: The minimum ambient temperature for permanently installed cables is -30°C, while for cables laid without preheating, it can be as low as -50°C.
Short-Circuit Condition: The maximum temperature of the conductor during a short circuit is specified as +2500°C (noting that this figure is likely a typographical representation of a very high short-term temperature, typically around +250°C in similar cables).
Bending Radius:
The cable’s minimum bending radius is defined as 12 times its external diameter (12 x D), ensuring that installation does not compromise its integrity.
High Voltage Testing:
An 11 kV AC test (50 Hz for 5 minutes) is performed to verify the insulation quality and overall integrity of the cable.
Flame Propagation Resistance:
The cable meets the IEC 60332-1-2 and IEC 60332-3-24C standards for resistance to flame spread, ensuring enhanced fire safety in explosive atmospheres.
Mechanical Strength:
The maximum tensile force the cable can withstand is calculated as 50 times the sum of the cross-sectional areas of the working conductors (in mm²).
Electrical and Physical Parameters
Conductor Variants:
The cable is available in multiple conductor sizes (e.g., 3x25/25, 3x35/25, 3x50/25, 3x70/25, 3x95/30, 3x120/30, 3x150/30, 3x185/30). For each variant, detailed parameters are specified, including:
Insulation, Inner Sheath, and Armor Thickness: Each layer has a nominal thickness ensuring balanced electrical and mechanical performance.
Overall Diameter and Weight: The overall cable diameter and weight per kilometer are provided in the technical tables.
Conductor Resistance: Maximum resistance values at 20°C are listed, indicating the efficiency of the copper conductors.
Electrical Characteristics:
Current-Carrying Capacity: Detailed tables list the nominal current capacity (in amperes) for each conductor size, as well as the unit inductance (mH/km) and unit inductive reactance (Ω/km).
Derating Factors:
For cables installed in parallel (e.g., stacked on supports), correction factors are applied to account for reduced cooling. For instance:
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 corrections are also specified (e.g., at 30°C, Kt = 0.96; at 35°C, Kt = 0.92; and so on).
Packaging and Installation
Packaging:
Standard packaging is available in 500 or 1000-meter drums, with custom lengths and packaging options available upon request.
Installation Considerations:
The installation process must consider the specified minimum bending radius and apply appropriate derating factors for parallel cable installations and elevated ambient temperatures.
Field Use:
Designed for harsh underground mining conditions, the cable’s robust construction and flame-retardant properties ensure reliable operation even in environments prone to explosive atmospheres.
Summary
The Type YRUHKGXSekFpyn 3.6/6 kV Mining Power Cable is a comprehensive solution for mining power distribution systems. Its construction features high-quality copper conductors, advanced XLPE insulation, multiple layers of sealing and shielding, and robust flat steel wire armor—all tailored to withstand the rigorous demands of underground mining environments.
With compliance to international standards such as ZN-TF 203:2006 and PN-HD 620 S1:2002, this cable guarantees enhanced safety, excellent electrical performance, and reliable durability in challenging conditions.
Frequently Asked Questions (FAQ)
Q: What is the rated voltage of this cable?
A: The cable is designed for 3.6/6 kV applications, making it ideal for low-voltage power distribution in mining operations.Q: What type of insulation does the cable use?
A: It uses flame-retardant cross-linked polyethylene (XLPE) insulation (Type DIX 3), ensuring high thermal stability and excellent electrical properties.
Q: What materials are used for the conductors?
A: The cable features multi-stranded, round copper conductors that are compacted to Class 2 as per EN 60228 standards, providing excellent conductivity and flexibility.
Q: How are the individual conductors shielded?
A: Each conductor is individually shielded with either a conductive tape or a conductive polyethylene layer combined with copper tape to minimize electromagnetic interference (EMI).
Q: What is the purpose of the overall shield?
A: The overall shield, typically applied as a continuous copper tape wrap, further reduces EMI and enhances the cable’s overall performance.Q: How is moisture ingress prevented in this cable?
A: Moisture is kept at bay through a radial seal using an aluminum/PVC tape and a longitudinal seal provided by a water-swelling tape, ensuring comprehensive protection.
Q: What type of armor does this cable have?
A: The cable is reinforced with flat steel wire armor, which offers robust mechanical protection against physical damage in rugged mining environments.
Q: What is the role of the PVC sheath?
A: The inner PVC sheath (type DMV 31) protects the insulation layer, while the outer flame-retardant PVC sheath (also type DMV 31 and typically red) provides additional mechanical and flame-retardant protection.
Q: How does the cable perform in explosive atmospheres?
A: With its flame-retardant XLPE insulation and PVC outer sheath, the cable is engineered to operate safely in explosive environments like methane or coal dust zones in mines.
Q: Which standards does this cable comply with?
A: It meets several industry standards, including ZN-TF 203:2006 and PN-HD 620 S1:2002, ensuring high-quality performance and safety.
Q: What is the maximum operating temperature of the cable?
A: The cable’s conductors can operate continuously up to +90°C under normal conditions.
Q: What ambient temperatures can the cable tolerate?
A: It is suitable for permanent installations at ambient temperatures as low as -30°C, and even down to -50°C for installations without preheating.
Q: How does the cable handle short-circuit conditions?
A: The cable is designed to withstand high temperatures during short-circuit events, with its conductor temperature reaching extreme levels for a brief period without damage.
Q: What is the minimum bending radius for this cable?
A: The minimum bending radius is specified as 12 times the cable’s external diameter (12 × D) to avoid mechanical damage during installation.
Q: What high-voltage test does the cable undergo?
A: It is subjected to an 11 kV AC test at 50 Hz for 5 minutes to ensure the integrity of its insulation and overall construction.
Q: How does the cable reduce electromagnetic interference (EMI)?
A: EMI is minimized through individual conductor shielding combined with an overall copper tape shield around the entire cable core.
Q: What benefits does the XLPE insulation provide?
A: XLPE insulation offers superior thermal resistance, high dielectric strength, and durability against environmental stressors, making it ideal for mining applications.
Q: How does the flat steel wire armor contribute to the cable's durability?
A: The flat steel wire armor protects the cable against mechanical impacts, abrasions, and deformation in harsh underground conditions.
Q: Can this cable be installed in both on-ground and underground environments?
A: While primarily designed for underground mining, its robust construction also makes it suitable for other industrial applications with similar conditions.
Q: How is the cable’s current-carrying capacity affected by installation conditions?
A: The cable’s current-carrying capacity may be derated based on installation conditions such as parallel cable installation or elevated ambient temperatures, using specific correction factors.
Q: What correction factors are applied for parallel installations?
A: For cables installed together, correction factors are applied: 1.00 for a single cable, 0.93 for two cables, 0.90 for three, 0.87 for six, and 0.86 for nine cables stacked together.
Q: How do high ambient temperatures affect the cable’s performance?
A: When ambient temperatures exceed 25°C, additional correction factors (e.g., Kt values) are applied to adjust the cable’s current-carrying capacity for safe operation.
Q: What is the significance of the individual shielding on each conductor?
A: Individual shielding prevents cross-talk and minimizes interference between conductors, which is crucial for maintaining signal integrity in electrically noisy environments.
Q: How does the radial sealing system enhance cable performance?
A: The radial sealing system prevents the penetration of water and contaminants into the cable core, ensuring long-term reliability in damp conditions.
Q: What role does the longitudinal seal play?
A: The longitudinal seal, achieved with water-swelling tape, provides a continuous barrier along the cable’s length, protecting against moisture ingress along joints and seams.
Q: What are the benefits of using a flame-retardant outer sheath?
A: The flame-retardant PVC outer sheath helps prevent the spread of flames in case of fire, thereby increasing safety in potentially explosive mining environments.
Q: How is the cable packaged for shipment?
A: Standard packaging is available in 500 or 1000-meter drums, though custom lengths and packaging configurations can be arranged based on project needs.
Q: What maintenance practices are recommended for this cable?
A: Regular visual inspections for physical damage, checks for seal integrity, and periodic testing of electrical properties are recommended to ensure ongoing reliability.
Q: Can this cable be used for control circuits as well as power distribution?
A: While primarily designed for power distribution, its robust construction and effective shielding may also support control circuit applications where appropriate.
Q: How does the cable support safety in mining operations?
A: The combination of flame-retardant materials, robust mechanical protection, comprehensive sealing, and adherence to international safety standards enhances overall mine safety.
Q: What industries can benefit from this cable besides mining?
A: Although engineered for mining, its robust design and flame-retardant features also make it suitable for other heavy-duty industrial applications with similar environmental challenges.
Q: How does the cable’s construction ensure high electrical efficiency?
A: Its optimized conductor design, effective shielding, and high-quality XLPE insulation contribute to low resistance and minimal energy loss, ensuring efficient power transmission.
Q: What is the typical color coding of the cable layers?
A: The insulation is natural-colored, while the outer PVC sheath is typically red, facilitating easy visual identification during installation.
Q: How does the cable meet international quality standards?
A: It is manufactured in accordance with standards such as ZN-TF 203:2006 and PN-HD 620 S1:2002, ensuring consistency, reliability, and safety in its performance.
Q: Why is this cable particularly suitable for hazardous mining environments?
A: Its design—featuring flame-retardant materials, effective moisture sealing, robust flat steel wire armor, and specialized shielding—ensures reliable operation and enhanced safety in areas with explosive atmospheres, making it an ideal choice for mining applications.
Type YRUHKGXSekFpyn 3.6/6 kV Mining Power Cable
A robust, flame-retardant solution engineered for challenging underground mining environments. This cable features a high-performance copper core with multi-stranded conductors, insulated with flame-resistant XLPE, and protected by a dual-sealed PVC sheath. Designed to meet rigorous international standards like ZN-TF 203:2006, it offers superior individual and overall conductor shielding, ensuring minimal electromagnetic interference. Its flat steel wire armor and comprehensive moisture barriers deliver outstanding mechanical strength and durability, making it ideal for hazardous areas such as methane and coal dust zones. Upgrade your mining operations with this reliable, safe, and efficient power cable.
6/30/20218 min read