MYPTJ Monitored Medium-Voltage Mining Trailing Cable (3.6/6–8.7/10 kV)

MYPTJ monitored medium-voltage mining trailing cable delivers 3.6/6 kV, 6/10 kV and 8.7/10 kV feeder power to mobile flameproof substations, longwall face transformers and heavy underground mining equipment. Designed to MT/T 818.6-2009 (GB/T 12972.6), the cable integrates three metallic-screened power cores, split interstitial grounding cores and insulated ground-continuity monitoring (pilot) cores within a double-sheathed, braid-reinforced elastomer body.

Each power core is constructed from Class 5 flexible tinned copper strands, an extruded conductor semiconductive screen, +90 °C ethylene-propylene rubber (EPR) medium-voltage insulation, an extruded insulation semiconductive screen and a tinned-copper wire/synthetic-yarn composite metallic shield. The interstitial valleys house split tinned-copper earth conductors and a 3 × 2.5 mm² monitoring core group (suffix J) that continuously verifies earth-loop integrity and trips the feeder breaker on pilot open-circuit or short-circuit faults.

For coal mining operations in China, certificate holder Jiangsu Tebaoli'er Special Cable Co., Ltd. (江苏特宝利尔特种电缆有限公司) holds valid China National Mine Product Safety Mark (MA) certificates MIA230260 for MYPTJ-3.6/6 (25–150) mm², MIA230259 for MYPTJ-6/10 (25–150) mm², and MIA230261 for MYPTJ-8.7/10 (25–150) mm². These MA approvals apply to Chinese coal mines for the certified models and 25–150 mm² cross-sections.

Include the system voltage (3.6/6 kV, 6/10 kV or 8.7/10 kV), power core cross-section (25 mm² to 150 mm²), flameproof coupler type and required run length in your RFQ. TEBAOFLEX manufactures MYPTJ trailing cables from a 50 m minimum order quantity with a standard lead time of 7–45 working days.

Explore the mining and tunneling cable range for related configurations.

For lower-voltage underground coal trailing cables and open-pit medium-voltage shovel cables, compare these specifications: MYP & MYPT Screened Flexible Coal Mining Cable (0.38/0.66–1.9/3.3 kV) (for 0.38/0.66 kV to 1.9/3.3 kV screened flexible cables on underground face equipment); UGF & UGEFP High-Voltage Open-Pit Mining Trailing Cable (3.6/6–6/10 kV) (for 3.6/6 kV to 6/10 kV open-pit excavators and draglines exposed to sunlight and cold down to -40°C). Check system voltage (3.6/6 kV, 6/6 kV, or 8.7/10 kV) and ground-monitoring relay settings before ordering.

Construction

The representative construction illustrates MYPTJ 6/10 kV 3×50 + 3×16/3 + 3×2.5 mm²: three equal Class 5 tinned-copper power cores in trefoil with conductor semiconductive screen, thick +90 °C EPR insulation, insulation semiconductive screen and tinned-copper composite metallic shield, accompanied in the three outer interstitial valleys by split bare tinned-copper grounding elements and insulated monitoring pilot cores, enclosed in a light-grey inner elastomer bedding, open-weave reinforcing braid and heavy-duty red or black flame-retardant polychloroprene outer sheath.

Applications

Select the voltage grade (3.6/6 kV, 6/10 kV or 8.7/10 kV) and conductor cross-section according to transformer feeder load, voltage drop over roadway runs and pilot-monitoring relay compatibility.

• Medium-voltage movable power feeders connecting underground main substations to mobile flameproof longwall transwitch units (KBSGZY).
• Monitored trailing feeders for 6 kV and 10 kV underground coal-mine pump stations, haulage winches and high-capacity shearer supply transformers.
• Tunneling and shaft-sinking medium-voltage mobile power distribution requiring continuous ground-check pilot monitoring.
• Roadway monorail suspension systems and motorized cable reels operating at a minimum bending radius of 12 × cable outside diameter.

When selecting medium-voltage trailing cables across MT 818 and DIN VDE 0250-813 standards, consult these resources: Medium Voltage Mining Cable Selection Guide (for engineering comparisons of semi-conductive vs metallic core screens, voltage classes, and reeling duty); (N)TSKCGEWÖU 3.6/6kV Medium Voltage Mining Trailing Cable (for VDE 3.6/6 kV heavy-duty reeling and trailing cables with anti-torsion braid). Confirm earth-continuity pilot resistance and minimum drum bend radius for your mobile substation or reel.

Specifications

Continuous current-carrying capacities are based on +90 °C conductor temperature at +25 °C ambient air in free underground ventilation.

Each power core undergoes routine AC voltage withstand and partial-discharge testing prior to dispatch.

MA certificates MIA230260, MIA230259 and MIA230261 are held by Jiangsu Tebaoli'er Special Cable Co., Ltd. (江苏特宝利尔特种电缆有限公司) and apply to coal mines in China for the certified 25–150 mm² cross-sections.

Standards

IEC 60502-2 Medium-Voltage Power Cable Reference