IEC Standard Copper Power Cable
Manufacture according to IEC 60502-2.
1.0 SCOPE
1.1 This specification covers the design, manufacture, tests, packing and transportation of
MV Single core, MV Three (03) core, XLPE (Cross Linked Polyethylene) insulated, single wire armoured, and PVC sheathed power cables for operation up to and including 36kV.
2.0 SYSTEM PARAMETERS
System Voltage
|
11kV or 33kV
|
System Highest Voltage
|
12kVor36kV
|
System Frequency
|
50 Hz
|
Method of earthing
|
Effective earthing
|
3.0 SERVICE CONDITIONS
4.0 APPLICABLE STANDARDS
The cable supplied under this section shall be in accordance with the latest editions /amendments
of the Standard specified below and amendements thereof.
IEC 60502-2 - Extruded solid dielectric insulated power cable and their accessories for rated voltage from 1kV up to 30kV. (6/10 (12kV)), 18/30 (36kV)
IEC 60228 - Conductors of Insulated Cables
IEC 60229 - Test on Cable Over sheaths which have a special Protective Function and are applied by Extrusion.
IEC 60811 - Common test methods for insulating and sheathing materials of electric cables
IEC 60885-3 -Electrical test methods for electric cables - Part 3: Test methods for partial discharge measurements on lengths of extruded power cables
IEC 60227-4, 3, 2, 1 - Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V
5.0 UNIT OF MEASUREMENT AND LANGUAGE
In all correspondence, in all technical schedules and on all drawings, the metric units of measurement shall be used. On drawings or printed pamphlets where other units have been used, the equivalent metric measurements shall be added. All documents, correspondence, drawings, reports, schedules instructions, and nameplate readings of the equipment shall be in English language.
6.0 DESIGN AND CONSTRUCTION REQUIREMENTS
6.1 Construction
The cable shall be of single/three/seven/Nineteen core construction, made up of highly compacted, round, stranded conductor of high grade Electrolytic Copper, XLPE insulated, suitable for use in system with nominal system voltage of either 11kV or 33 kV and highest system voltage of either 12kV or 36 kV.
The cable in general shall be designed and manufactured according to the requirement of
IEC60502 and IEC 60228.
6.2 Conductor screening
Conductor screening shall be non-metallic and shall consist of a layer of strippable extruded semi conducting compound which shall be firmly bonded to the inner surface of the insulation. The contact of the semi conducting shields with the cable insulation must be perfect without void creation at the inner surfaces. The interfaces must be smooth in a regular geometric shape and the semi conducting compound must have homogeneous structure particularly at the inter faces. The semi conducting shields must be mechanically stable under load cycling of the power cable.
A metallic screen shall be applied around the core. The screen shall consist of helically
applied overlapped copper tape.
6.3 Insulation
Electrical grade cross linked polyethylene (XLPE) shall be extruded in simultaneous extrusion of conductor screening layer and insulation screening layer and shall be suitably cured. The insulation shall concentrically cover the conductor.
The nominal thickness of the insulation shall be 8 mm for 33kV and 3.4mm for 11kV and shall be guaranteed by the manufacturer to withstand the specified system voltages. The average thickness of insulation shall be not less than the specified nominal value. The minimum thickness at any place shall be as per IEC 60502.
The colour of the insulation shall be such that it is easily distinguishable from the screening
materials.
6.4 Insulation Screening
The insulation screening shall be non-metallic and shall consist of a layer of extruded semi conducting compound provided over the insulation simultaneously with the extrusion of the insulation. Semi conducting tape with suitable overlap over the extruded semi-conducting layer of compound shall be applied.
Conductor screen, insulation and insulation screen shall be vulcanized by triple extrusion method.
6.5 Metallic screening
Concentric layers of copper wires with copper counter spiral shall be applied over the insulation screening. The total cross section of copper wire screen shall be not less than 25 mm2 for conductor of sizes up to 240 mm2 and shall be not less than 35mm2 for conductor sizes above 240 mm2 up to 300 mm2.
In addition to above condition, manufacturer should make sure that minimum earth fault current capability of each of the three individual core metallic screens for 1 sec. shall be 2.5KA (i.e. 7.5KA for 1 sec. when all of the 3 metallic screens are combined together) without combining armour.
6.6 Water Sealing
Cables shall be provided with water sealing of conductor and longitudinal and radial water sealing along the metallic screen as described below:
The conductor water sealing shall consist of a swelling material provided between conductor strands which turns into a jelly when comes in contact with water.
The longitudinal water sealing along the metallic screen shall be provided by a swelling layer applied over the metallic screen or by a swelling material provided between metallic screen wires as applicable.
The radial water sealing shall be provided by a corrosion resistant metal or metal polyethylene laminate applied over the longitudinal water sealing. Special care in preventing galvanic corrosion is required in the design. It is essential that water sealing is efficient to reduce the lengths of cable to be cut, in case of any ingress of water due to mechanical cable damage.
6.7 Over sheath
The over sheath shall be an extruded layer of PVC type ST2 or polyethylene (PE) type ST7 black in colour. An outer conducting coating shall be applied to the covering to serve as an electrode for the voltage test on the over sheath.
The outer sheath shall be of fire and termite resistant PVC or PE material. Anti corrosion protection shall consist of a coating of waterproof compound/foil/plastic tape over the metallic screening followed by continuous extrusion ofPVC or PE sheath.
6.8 Metallic Armour
The metallic armour shall conform to IEC 60502 with latest addendums and amendments.
The armouring for multi-core cables shall consist of galvanized steel round wires applied over the inner sheath.
The armouring for single core cables shall consist of non-magnetic material such as aluminium or aluminium alloy. In case of galvanized steel armour wires, the mass of coating shall not be less than 275 g/m2.
6.9 Additional requirements are applicable for 3 core cable.
6.9.1 Assembly
The three insulated cores shall be laid up with necessary non-hygroscopic fillers and bound with non-vulcanisable tape/strip or wire to a compact circular assembly.
Metallic layer over each individual core shall be in contact with each other.
6.9.2 Inner Sheath
The inner sheath shall be made of extruded PVC or PE complying with relevant IEC standard.
6.9.3 Identification
The individual cores shall be identified by coloured insulation and the colour shall be red, yellow and blue. This applies only to the three core cables.
The cable shall be clearly and permanently embossed with the following information throughout the length of the over sheath. Letters and figures raised and consist of upright block characters. Minimum size of characters shall not be less than 15% of average overall cable diameter.
1. Voltage rating of cable
2. Year of manufacture.
3. Size of cable
(Example: '185 SQ MM 600/1000 VOLTS PVC CABLE 2012')
7.0 PACKING
The cable shall be wound on a suitable non returnable strong (wooden or steel) drum to prevent damage during storage and transport. In case of a wooden drum, Wood preservative shall be applied to the entire drum.
A layer of water proof paper shall be applied to the surface of the drums and over the outer most cable layer.
Each drum shall carry manufacturer's name, purchaser's name, address and contract number, item number and type, size and length of the cable, net and gross weight stenciled on both sides of drum. A tag containing the same information shall be attached to the leading end of the cable. An arrow and suitable accompanying wordings shall be marked on one end of the reel indicating the direction in which it should be rolled.
Packing shall be sturdy and adequate to protect the cables, from any injury due to mishandling or other conditions encountered during transportation, handling and storage. Both cable ends shall be sealed with PVC/Rubber caps so as to eliminate ingress of water during transportation and erection.
The diameter of bore for the cable drum for inserting the shaft shall not be less than 120mm. The cable drums must be closed with wooden planks to prevent cable damage during storage and transportation.
Cable Drum Length
The length of cable for drum shall be according to the following table. A variation of + 5% of the cable drum length may be acceptable.
CABLE THIRD-PARTY ACCREDIT
ISO, CE, SGS, SONCAP, BV, COC, ETC.
FAQ
1.Q:Are you a factory or trading company?
A: Manufacturing base in Henan, China, with more than 500 workers.
2.Q:How can I visit there?
A: Sure, if you need, we will arrange the driver to pick you up.
3.Q:How can I get some samples?
A: Contact me on below, and determine sample and address for shipping.
4.Q:Have you ever supplied cables to our country?
A: Yifang Cable has been sold to over 100 countries and regions in the world. You can contact me for details.
5.Q:What is your MOQ?
A: MOQ Normally 500 meters for big diameter cables. Please contact me for detail info if you have specific cable requirement.
6. Q:When can I get the price?
A: Usually quote within 6 hours after we get your inquiry.
7.Q:How long is your delivery time?
A: According to your order's quantity, our lead time is usually 3 - 20 working days.
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