YJV 6/10 kV Medium Voltage XLPE Power Cable
MV-YJV-6-10kV
Three-layer screened construction at 6/10 kV: the default primary distribution cable for industrial plants and utility feeders.
Medium Voltage Power Cable
Above 1.8/3 kV a power cable stops being a conductor wrapped in insulation and becomes a controlled field structure. The difference is the triple extrusion: a semiconductive conduc
Above 1.8/3 kV a power cable stops being a conductor wrapped in insulation and becomes a controlled field structure. The difference is the triple extrusion: a semiconductive conductor screen bonded over the stranded copper to smooth out the microscopic peaks between wires, then XLPE insulation, then a second semiconductive screen over the insulation. Those two black layers remove air gaps where partial discharge would start, and without them a cable rated at 6/10 kV would fail within months of energisation rather than decades.
The third screening layer is metallic, and it earns its keep. A copper tape or copper-wire metallic screen forms an equipotential surface over the insulation screen, giving earth-fault current a defined low-impedance path and letting the electric field stay radial rather than tangential. Buyers should check its cross-section explicitly: a small screen may carry negligible load current yet be undersized for a 20 kA fault at the substation busbar. Voltcore extrudes all three layers on one line in Yixing and tests partial discharge and screen continuity on every MV drum before release.
4 constructions in Medium Voltage Power Cable
YJV22 8.7/15 kV Armoured Medium Voltage Cable
MV-YJV22-8.7-15kV
4.5 mm insulation and steel tape armour: the specification for 15 kV feeders laid directly into open ground.
26/35 kV Single-Core Medium Voltage XLPE Cable
MV-YJV-26-35kV-1C
10.5 mm XLPE, one core per cable: for high-capacity circuits where three single cores beat one large three-core drum.
YJLV 6/6 kV Aluminium Conductor Medium Voltage Cable
MV-YJLV-6-6kV
Screened MV construction on aluminium conductors: 40 to 45 % of the drum weight of copper at the equal-ampacity size.
Reading U0/U(Um) and picking the voltage grade you actually need
IEC 60502-2 states medium-voltage cable as U0/U(Um): U0 is conductor-to-earth, U is conductor-to-conductor, Um is the maximum system voltage the equipment tolerates. Practically, the U0 choice follows how the network handles earth faults. On a system where an earth fault is cleared quickly, 6/10 kV is standard; where faults may persist for longer, 8.7/15 kV gives the extra insulation margin that keeps the stress below the ageing threshold.
Do not assume the higher number means thicker cable everywhere. Insulation thickness steps with voltage class, so 8.7/15 kV has 4.5 mm against 3.4 mm at 6/10 kV, which raises diameter, weight and minimum bending radius. Where a project runs several voltage classes off one transformer fleet, ask whether the higher-grade drum can be standardised; buying one type in larger volume frequently costs less than buying two smaller lots.
- 6/6 kV and 6/10 kV: 3.4 mm nominal XLPE insulation
- 8.7/15 kV: 4.5 mm nominal XLPE insulation
- 12/20 kV: 5.5 mm; 18/30 kV: 8.0 mm; 26/35 kV: 10.5 mm
- Confirm earth-fault clearing philosophy before fixing the grade
Why the metallic screen cross-section belongs on the purchase order
Screens are routinely specified as 'copper tape screen' with no area given, and that omission creates the most expensive site failures in medium voltage work. The screen has to carry earth-fault current long enough for protection to operate. Calculate from kA and operating time using the adiabatic method, or simply tell Voltcore the busbar fault level and clearing time and we will return the minimum screen cross-section per size.
For circuits above roughly 500 m, circulating currents in single-point-bonded or cross-bonded systems deserve attention too. We advise on bonding arrangement, supply screen cross-section options from 16 mm² to 50 mm² and above, and provide the DC resistance figures per kilometre that a protection engineer needs for the loop-impedance calculation.
Installing medium voltage: what the termination room decides about the cable
Most medium-voltage faults happen in the termination, not the run. Specify a strippable insulation screen where installers work by hand, and a bonded screen only where a heat-shrink jointing system qualified for it is being used. Confirm whether the joints are heat-shrink, cold-shrink or pre-moulded before fixing the insulation screen type, because removing a bonded screen incorrectly damages the insulation underneath.
Single-core MV circuits also need a laying pattern decision: trefoil gives the lowest inductance and best current balance; flat formation is easier to route and cleat but requires transposition on long runs. Tell us the pattern and we supply the induced-voltage and armour-loss figures, and recommend aluminium wire armour with single-point bonding where the route demands it.
- Strippable versus bonded insulation screen: decide from the jointing system
- State trefoil or flat formation for single-core runs
- Minimum bending radius single-core is 20 × OD, multi-core 15 × OD
Request pricing across Medium Voltage Power Cable
Include cross-section, core count, voltage grade, route length and installation method — those five determine price more than anything else on the page.
- Engineer-reviewed before pricing
- Reference drawings issued with the quotation
- Free sample up to free sample up to 5 m