SPECIFICATION FOR CROSSLINKED POLYETHYLENE INSULATED PVC SHEATHED CABLES. F O R E W O R D presinescinmett.ga: (Part 2).3 This standard was originally published in when the experience in the country about manufacture of these types of cables was limited. covered in a separate. IS (Part-II) and its amendment. Specification for Cross linked polyethylene insulated thermoplastic sheathed. Cables- for working voltages from TO. IS (Part 2): Specification For. Crosslinked Polyethylene Insulated Thermoplastic Sheathed Cables Part 2 For Working. Voltages.
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IS (Part 2) Indian Standard. SPECIFICATION FOR. CROSSLINKED POLYETHYLENE INSULATED. PVC SHEATHED CABLES. SECTION 1. IS - - Crosslinked Polyethylene Insulated Thermoplastics Sheathed Cables, Part 2: for Working Voltages from kV up to and Including 33 kV. IS (Part 3): Table 2 Properties of XLPE insulation. (Clause 5). SI No. Property i) Tensile strength before ageing ii) Elongation at break before.
IS 7098 – Part 1 – 1988 – Scribd
If the system is unearthed then we need to use cable which is manufactured for unearthed system. The unearthed system requires high insulation level compared to earthed System.
The insulation level for cable for unearthed system has to be more.
Earthed System: Earlier the generators and transformers were of small capacities and hence the fault current was less.
The star point was solidly grounded. This is called earthed system. In Three phases earthed system, phase to earth voltage is 1. Therefore voltage stress on cable to armor is 1. Where in unearthed system, if system neutral is not grounded phase to ground voltage can be equal to phase to phase voltage. In such case the insulation level of conductor to armor should be equal to insulation level of conductor to conductor.
In an earthed cable, the three phase of cable are earthed to a ground.
Each of the phases of system is grounded to earth. Single core cables except those specified in The outer layer shall, except in special cases, be applied in the reverse direction to the inner layer, and there shall be a separator of suitable non-hygroscopic material; such as plastic tape, bituminized cotton tape, bituminized hessian tape, rubber tape, proofed tape between the inner and outer layers of armour wires strips.
The armour of cables having calculated diameter below armouring greater than 13 mm shall consist of either galvanized round steel wires or galvanized steel strips. The tolerance on nominal dimensions shall be as per IS : The minimum number of dips shall be reduced by one half-minute dip in case of formed wires, dip test is applicable only for the face.
It shall be applied: a over the non-magnetic metallic tape covering the insulation or over the non-magnetic metallic part of insulation screening in case of unarmoured single core cables, and b over the armouring in case of armoured cables.
NOTE Partial discharge test shall be carried out on full drum length. After completing the bending operations, the test sample shall be subjected to partial discharge measurement and shall comply with the requirements given in After third cycle, the sample shall be subjected to dielectric power factor as a function of voltage Methods of test for cables.
The voltage shall be gradually increased to the specified value and maintained for a period of 4 hours. If while testing, interruption occurs during the 4 hour period the test shall be prolonged to the same extent. If the interruption period exceeds 30 minutes, the test shall be repeated. The indentation, printing or embossing shall be done only on the outer sheath.
IS 7098-2 (2011): Crosslinked Polyethylene Insulated
The ends of the cable shall be sealed by means of nonhygroscopic sealing material. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by ISI and operated by the producer.
ISI marked products are also continuously checked by ISI for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the ISI Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution. Annealing test for copper. Tensile test for aluminium. Dielectric power factor as a function of voltage. Hot set test for insulation.
Difference between Unearthed Cable & Earthed Cables
Heating cycle test followed by dielectric power factor as a function of voltage and partial discharge tests. Test for thickness of insulation and sheath. NOTE — Partial discharge test shall be carried out on full drum length. Dielectric power factor as a function of temperature.
After completing the bending operations. After third cycle. If the interruption period exceeds 30 minutes. The indentation. The voltage shall be gradually increased to the specified value and maintained for a period of 4 hours.
If while testing. Rated voltage. Sl No. The ends of the cable shall be sealed by means of nonhygroscopic sealing material. Min percent. Details of conditions under which a licence for the use of the ISI Certification Mark may be granted to manufacturers or processors.
The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection. ISI marked products are also continuously checked by ISI for conformity to that standard as a further safeguard.
Min Max 15 percent. Part 1 Elastomeric and thermoplastic insulated cables.
In order to ensure the radomness of selection. A test sample is called defective if it fails in any one of the acceptance tests.
These test samples shall be subjected to each of the acceptance tests see LOT A If the number of defectives is less than or equal to the corresponding permissible number given in A SHRI S. Rajpura Central Eastern: Manak Bhavan.
Copyright BIS has the copyright of all its publications.
New Delhi This does not preclude the free use. This Indian Standard has been developed by Technical Committee: Standards are also reviewed periodically. Enquiries relating to copyright be addressed to the Director Publications.
Sector A. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments.Specification for conductors for insulated electric cables and flexible cords first revision.
Bending test followed by partial discharge test. After completing the bending operations.
The oxygen index shall not be less than Hallmarking Hallmarking is the accurate determination and official recording of the proportionate content of precious metal in precious metal articles. The ends of the cable shall be sealed by of non-hygroscopic sealing material. Min percent. Ja Vier.
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