Crosslinking cable quality is high, the power frequency breakdown strength can reach 50 kv/mm, tan6 was only 5 x10-4, dielectric constant is 2.3, is the ideal cable insulation, at the same time, the working temperature of crosslinking cable up to 90 c, good heat resistance and weather resistance, and high mechanical properties and chemical properties such as corrosion resistance, in the middle and lower cable products basically have all crosslinking cable. Although the technology of crosslinked cable is different, its insulation quality is completely the same. The selection of different types of cables in common use is introduced as follows:
(1) 1 kv three core aluminum core is 70 mm ‘cross-linked polyethylene insulated PVC sheathed steel pin cables, models for YJLV22-0.6/1, 3 x70: the types of crosslinking insulation (YJ) can use any kind of crosslinking process, but to use warm water network it best, such as using dry crosslinking, the equipment investment is large, slow production, such as cable again, in the vast product line cable will be fine, or break, if use irradiation crosslinking, due to the bending times too much will make the compression of the cable conductor is impaired, press the copper conductors are easier to damage. When purchasing, it should be taken into consideration that dry crosslinking should be avoided for aluminum cable with small cross section; For large section or copper core cable can not be used to crosslink, warm water crosslink has greater flexibility.
(2) 10 kv three core copper 120 mm ‘crosslinked polyethylene insulated PVC sheathed steel tape armoured cable, models for YJV22-8.7/10, 3 x 120:10 kv level cable is larger, especially copper core cable, can’t irradiation crosslinking process, except for the bending times too much easy to damage the cable, and the insulation cimc tired space charge decreased insulation quality. At present, dry crosslinking technology is the most suitable for the production of 10kV cable, which has stable product quality and reasonable price. However, if the cable quantity is small and the specifications change a lot, dry crosslinking scrap rate is very high, and it is easy to break the cable with a small section, so warm water crosslinking should be used. Warm water crosslinking belongs to the category of low temperature crosslinking, with no insulation thermal stress and good insulation quality. To eliminate the misunderstanding of “certain water content” of warm water crosslinking, with the development of new warm water crosslinking materials, it has a very good development prospect in the field of medium and low voltage cables.
(3)10KV aluminum core 70mm overhead insulated cable, models jKLYj-6 / lO, 1×70:, this type of cable is also in the production of three technologies, using the cross linking technology of amplitude lighting. In order to eliminate space charge, after the cable conductor is grounded for a long time, the cable can be safely used in the overhead cable line of semi-insulated system. The comparison between dry crosslinking and warm water crosslinking is consistent with the above 10kV cable production.
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