Triplex cables are characterised by the appearance of 3 core cables twisted around each other. The hexagons separating the pictured 11kV cables must have the smaller hexagonal tubes nested in the large one to create additional strength. Where the cable ducts are located in a designated hazardous area according to the ATEX Directive we can provide expert advice and product recommendations for sealing cables in potentially explosive atmospheres.
View product. By entering your details you give consent to receive free courses and tutorials through email. You can unsubscribe at any time. We use cookies to give you the best browsing experience. Rarely used at voltages below kV due to the mounting centres having to allow for sufficient heat-dissipation.
Running in flat formation, the central phase of the three-phase set is adversely affected by the magnetic fields around the neighbouring phases, leading to a higher running temperature on the middle phase and subsequent voltage imbalance. Trefoil formations are chosen for applications where space is at a premium and flat formations also tend to be less cost effective due to the increase potential cable route space they take up. Our experience of such installations has generally been with cables above kV, with cables under kV being laid in a trefoil formation.
An adaptation of the trefoil formation can be found with the increasingly popular Triplex formation. Due to the constant phase rotation of the cores, using conventional trefoil cleats is not possible as the position of the mounting base will not be constant. For this reason our Triplex Cable Former provides a cleating solution, allowing traditional trefoil cleats to be used. All rights reserved. Website by Tiga Creative Marketing Kent. Trefoil Phase Formation One of the main reasons trefoil formations are used is that it places the phases the same distance apart, so the magnetic field and circulating currents are equivalent for each cable phase.
Flat Phase Formation Rarely used at voltages below kV due to the mounting centres having to allow for sufficient heat-dissipation. Triplex Formation An adaptation of the trefoil formation can be found with the increasingly popular Triplex formation.
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There are currently no standards for the testing of cable cleats during short circuit conditions when used with multicore cable.
Nevertheless there is also a need to restrain, keep safe, and preserve the integrity of multicore cables, whether or not they are equipped with some form of mechanical protection or armour. It is a common assumption that the multicore cables which are equipped with armour and an outer jacket or sheath would contain the forces experienced during a short circuit. However, CMP Products continues to test its range of cable cleats on multicore cables during short circuit conditions, for project specific installations.
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Cleat formation
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