3*70mm2 Medium High Voltage Power Cable 8.5KV 15Kv Armored For Underground Distribution
Basic Properties
Trading Properties
Product Summary
Product Details
8.5KV High Voltage Power Cable
,15Kv High Voltage Power Cable
,Underground Distribution Armored Power Cable
Product Description
ZC-YJV22 8.5/15Kv Armored Medium High Voltage Power Cable for Underground Distribution
ZC-YJV22 8.5/15kV 3×70 mm² Medium-Voltage Armoured Power Cable
Model decoding:
ZC = Class C flame retardant (GB/T 19666) · YJ = XLPE insulation · V = PVC outer sheath · 22 = double steel-tape armour + PVC inner sheath · 8.5/15kV = U₀/U rated voltage (note: IEC/GB standard series uses 8.7/15kV; 8.5/15kV is a non-standard but occasionally seen utility variant — see §1 note) · 3×70 = 3-core, 70 mm² copper conductor.
1. Voltage Rating & Standard Note
|
Item |
Value |
|---|---|
|
Rated voltage U₀/U |
8.5/15 kV (conductor-to-earth / conductor-to-conductor) |
|
Highest system voltage Uₘ |
17.5 kV (per IEC 60038 / IEC 60502-2) |
|
AC withstand (routine) |
30.5 kV, 5 min |
|
Lightning impulse (BIL) |
95 kV peak |
|
Standard note |
The IEC 60502-2 / GB/T 12706 recognised grade for 15 kV class is 8.7/15 kV (U₀=8.7 kV). "8.5/15 kV" appears in some older utility specs or as a rounding/typo; if the project requires strict IEC/GB compliance, confirm whether 8.7/15 kV is acceptable — the cable construction below is identical to the 8.7/15 kV build. |
2. Cable Construction (inside → outside)
|
Layer |
Material & Dimension (3×70 mm²) |
|---|---|
|
Conductor |
Class 2 compacted stranded annealed copper, 70 mm² → 18/2.32 mm (or equivalent circular compacted), conductor Ø ≈ 9.9 mm |
|
Conductor screen |
Extruded semi-conductive XLPE-based layer, ≈ 0.6 mm |
|
Insulation |
XLPE (cross-linked polyethylene), nominal thickness 4.5 mm (per 8.7/15 kV class, GB/T 12706.2), insulation Ø ≈ 20.2 mm |
|
Insulation screen |
Extruded semi-conductive layer + copper tape screen (≈0.1 mm) helically lapped, bonded to insulation |
|
Core bedding / fill |
PP rope fill, non-hygroscopic, round-up to 3-core assembly |
|
Inner sheath (bedding) |
PVC (90 °C grade, flame-retardant ZC type), nominal ≈ 1.8 mm |
|
Armour |
Double galvanised steel tape, 2 × 0.5 mm (total ≈ 1.0 mm), reverse-lapped |
|
Outer sheath |
PVC, flame-retardant Class C (ZC), black, nominal thickness ≈ 3.1 mm |
|
Overall diameter |
≈ 59–61 mm (maker-dependent, 59.1 mm typical) |
|
Weight |
≈ 5 210 – 5 538 kg/km (Cu, with steel tape + PVC) |
3. Electrical & Thermal Parameters
|
Parameter |
Value |
|---|---|
|
Conductor DC resistance @ 20 °C |
≤ 0.268 Ω/km (Class 2, GB/T 3956) |
|
Capacitance (approx., L-E) |
~0.18 µF/km per core (typical for 15 kV XLPE 70 mm²) |
|
Inductive reactance (3-core, 50 Hz) |
~0.11 Ω/km |
|
Continuous conductor temp. |
90 °C (XLPE) |
|
Short-circuit temp. (max 5 s) |
250 °C |
|
Min. installation temp. |
0 °C (warm cable if colder) |
|
Max. ambient (design) |
40 °C air / 25 °C soil reference |
Ampacity (reference, ungrouped, underated)
-
In free air, 30 °C ambient: ≈ 220 – 240 A per phase
-
Direct buried, 20 °C soil, 0.7 m depth, thermal resistivity 1.0 K·m/W: ≈ 235 – 240 A
-
Correction factors: ×0.91 @ 35 °C air, ×0.82 @ 40 °C air; soil 25 °C → ×0.93; grouping 2 circuits → ×0.85.
4. Mechanical & Fire Performance
|
Item |
Specification |
|---|---|
|
Min. bending radius (3-core armoured) |
12 × OD ≈ 710 mm (GB/T 12706 / maker practice) |
|
Max. pulling tension |
≤ 50 N/mm² × 210 mm² (total Cu) ≈ 10.5 kN; use basket grip on armour/sheath, not conductor |
|
Crush resistance |
Steel-tape armour resists ≥ 4 kN/10 cm lateral load (direct-burial grade) |
|
Flame retardant |
Class C per GB/T 18380.3 / GB/T 19666 (ZC) — self-extinguishing, limited spread |
|
Smoke / halogen |
Standard PVC sheath: not LSZH; emits smoke & HCl. For LSZH use WDZ-YJV22 instead. |
|
IP (as installed) |
IP54 with sealed glands; steel tape + PVC sheath gives moisture/rodent protection |
|
Service life |
≥ 30 years at ≤ 90 °C conductor, normal soil/air |
5. Product Performance Summary
ZC-YJV22 8.5/15kV 3×70 is a medium-voltage distribution cable that pairs XLPE insulation (90 °C, 15 kV class) with double steel-tape armour so it can be direct-buried, run in cable trenches, tray, or duct without extra mechanical protection. The copper conductor + copper-tape screen gives low losses and controlled earth-fault current; the ZC PVC jacket meets Class C flame retardancy for confined civil spaces (substations, building risers, industrial plants) without going full LSZH.
Key trade-off: it is not fire-survival (no mica barrier, PVC burns) — for emergency feeders specify NH-YJV22 or WDZN-YJV22.
6. Application Scope
-
10 kV / 15 kV class primary distribution networks (utility feeder, substation outgoer)
-
Industrial plants: transformer secondary to MV switchboard, compressor/motor feeders ≤ ~4 MVA
-
Commercial / high-rise: MV riser to floor transformer rooms (10 kV systems)
-
Infrastructure: metro/subway MV supply, tunnel feeders, bridge crossing ducts
-
Renewables: PV/wind collector feeders (10 kV side), BESS PCS MV link
-
Direct burial in soil, cable trench, or encased concrete; tray in dry indoor substations
-
Not suitable for: flexible/moving equipment, submarine, EMC-critical unscreened runs (screen must be grounded), fire-escape emergency circuits requiring circuit integrity
7. Installation Notes (3×70 MV armoured)
|
Item |
Practice |
|---|---|
|
Bending |
12 D min (~710 mm). Use conduit sweeps; never sharp elbow on armour. |
|
Earthing |
Bond steel tape armour + copper screens to earth bar at both ends (screen continuity ≤ 0.1 Ω/km equivalent). |
|
Termination |
Use 15 kV class cold-shrink or heat-shrink terminations (e.g. 3M QTIII, Raychem RS), strip semi-con screens to precise overlap; stress cone mandatory. |
|
Pulling |
Basket grip on outer sheath; max 10 kN; lubricant in ducts. |
|
Jointing |
15 kV XLPE joint kit (resin or heat-shrink), screen reconstruction essential. |
|
Pre-energising |
1000 V DC megger L-E, L-L ≥ 100 MΩ; VLF 0.1 Hz 15 kV test or 30.5 kV AC 5 min acceptance. |
|
Support |
Tray: 600 mm centres horizontal; vertical riser: clamp every 1500 mm due to ~5.3 t/km weight. |
8. Selection Cross-Reference
|
Need |
Alternative |
|---|---|
|
Strict IEC/GB 15 kV class |
YJV22-8.7/15kV 3×70 (identical build, standard U₀) |
|
LSZH + flame retardant |
WDZ-YJV22 8.7/15 3×70 |
|
Fire-survival emergency feeder |
NH-YJV22 or WDZN-YJV22 8.7/15 3×70 |
|
Aluminium conductor (cost-down) |
ZC-YJLV22 8.7/15 3×70 (≈ 0.443 Ω/km, ~4 280 kg/km) |
|
Single-core armoured |
YJV22 1×70 (but use aluminium tape armour for AC to avoid magnetic loss) |
|
Higher current |
3×95 / 3×120 |
Quick spec snapshot
-
Model: ZC-YJV22 8.5/15kV 3×70 mm² (confirm 8.7/15kV interchangeability)
-
Build: Cu / XLPE 4.5 mm / Cu tape screen / PVC inner / dbl steel tape 0.5+0.5 / PVC ZC outer
-
OD: ≈ 59–61 mm · Weight: ≈ 5 210–5 540 kg/km
-
Ampacity: ~230 A air / ~235 A buried (30/20 °C, single, ungrouped)
-
Temp: 90 °C cont. / 250 °C sc (5 s)
-
Bend: 12 D (~710 mm) · Standards: GB/T 12706.2, GB/T 19666, IEC 60502-2, BS 6622 equivalent.
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