6-35kV extruded insulated power cable Global Procurement Guide
The 6-35kV extruded insulated power cables produced by hengfengyou group are commonly used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. The laying method can be buried, in the air, bridge, etc.
1、 Product executive standard
1. Gb/t 12706.2-2008 extruded insulated power cables and accessories with rated voltage from 1KV (um=1.2kv) to 35kV (um=40.5kv) - Part 2: cables with rated voltage from 6kV (um=7.2kv) to 30KV (um=36kv)
2. Gb/t 12706.3-2008 extruded insulated power cables and accessories with rated voltage from 1KV (um=1.2kv) to 35kV (um=40.5kv) - Part 3: cables with rated voltage of 35kV (um=40.5kv)
3. Gb/t 19666-2005 general rules for flame retardant and fire resistant cables (only applicable to flame retardant and fire resistant cables)
2、 Product characteristics
1. Service conditions
Cable laying temperature: ≥ 0 ℃;
Maximum allowable long-term working temperature of cable conductor: XLPE insulation 90 ℃;
The maximum working temperature of the cable in case of short circuit (max. 5S): XLPE insulation 250 ℃; PVC insulation, sectional area ≤ 300mm ²， 160 ℃, sectional area greater than 300mm ²， 140℃；
The minimum allowable bending radius of the cable: single core without armor 20d, single core with armor 15d, three core without armor 15d, three core with armor 12D. Note: D is the actual outer diameter of the cable.
2. Structural requirements
The basic structure of 6-35kV extruded insulated power cable is composed of conductor, insulating layer and protective layer.
1) Conductor
The conductor is twisted with copper wire or aluminum wire, which meets the requirements of gb/t 3956-2008 standard. Conductor is the conductive part of power cable, which is used to transmit electric energy
2) Insulation
PVC or XLPE extrusion is used for insulation. Electrically isolate the wire core from the earth and wire cores of different phases to ensure power transmission.
3) Outer sheath
The outer sheath is PE or PVC, and can also provide flame retardant, anti termite, low smoke and low halogen flame retardant, low smoke and zero halogen flame retardant and other materials according to customer requirements. The function is to protect the power cable from the invasion of external impurities and moisture, and to prevent external forces from directly damaging the power cable.
3、 The product structure diagram is as follows.
4、 Model description of 1kV extruded insulated power cable
Product code (omitted)
Characteristic code wdz low smoke halogen-free flame retardant; Za (ZB, ZC) - flame retardant (a, B, c); NH fire resistance;
Conductor material code
Type 2 copper conductor - (T) omitted; Type 5 copper conductor-r; Aluminum conductor-l
Insulation material code
YJ cross linked polyethylene insulation; V-pvc insulation; E-ethylene propylene rubber insulation; Ey hard ethylene propylene rubber insulation
Sheath material code
V-pvc sheath; Y-polyethylene or polyolefin sheath; F-elastomer sheath; Q-lead sleeve
Armor material code
2-double steel tape armoring; 3-thin round steel wire armor; 4-thick round steel wire armor; 6- (double) non-magnetic metal tape armor; 7-non magnetic metal wire armor
Code of outer sheath material
2-pvc sheath; 3-polyethylene or polyolefin sheath; 4-elastomer sheath
6-35kV extruded insulated power cable FAQ
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What is the typical application of 6-35kV extruded insulated power cables?
These cables are widely used in power transmission and distribution networks, industrial plants, and renewable energy systems for medium-voltage applications.
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What materials are used for the insulation and sheath?
The insulation is typically cross-linked polyethylene (XLPE), while the sheath can be made of PVC, LSZH (Low Smoke Zero Halogen), or PE, depending on environmental requirements.
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What are the advantages of XLPE insulation over traditional materials?
XLPE offers higher thermal resistance, better dielectric strength, and improved mechanical properties compared to PVC or paper-insulated cables.
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What is the maximum operating temperature for these cables?
The maximum continuous operating temperature is usually 90°C for XLPE-insulated cables, with short-circuit ratings up to 250°C.
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Are these cables suitable for direct burial or underground installation?
Yes, they can be directly buried if properly armored (e.g., with steel wire or tape) and protected with a robust outer sheath.
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Do these cables support wet or underwater installation?
Special waterproof designs (e.g., longitudinal water-blocking layers) are available for damp or submerged environments.
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What tests are conducted to ensure cable quality?
Routine tests include partial discharge, AC/DC voltage withstand, insulation resistance, and conductor resistance measurements.
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How should these cables be stored before installation?
They should be kept in a dry, well-ventilated area, away from direct sunlight and mechanical damage, with reels stored upright.
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What are the bending radius requirements during installation?
The minimum bending radius is typically 15-20 times the cable diameter for single-core cables and 12-15 times for multi-core cables.
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How can I identify cable faults, and what repair methods are recommended?
Faults can be located using TDR (Time Domain Reflectometry) or high-voltage pulse methods. Repairs should follow manufacturer guidelines, often involving heat-shrink joints or epoxy resin sealing.
