A high voltage cable hv cable is a cable used for electric power transmission at high voltage a cable includes a conductor and insulation cables are considered to be fully insulated.
High voltage cable laying method.
High voltage cables used by western power are normally un armouredsingle core xlpe insulated earthedscreen cables which may be bundled in twisted trefoil for three phase use.
This method of laying underground cables is simple and cheap and is much favoured in modern practice in this method of laying underground cables a trench of about 1 5 metres deep and 45 cm wide is dug the trench is covered with a layer of fine sand of about 10 cm thickness and the cable is laid over this sand bed the sand prevents the entry of moisture from the ground and.
Temperature range the temperature range of the cable is of great importance for both the user and fitter.
All cables and ducts laid into cable trrench should be over protected by a cable protection cover or tape depending upon the highest voltage cable to be protected within the cable duct typically in the uk the following cable protection tapes and covers are used for lv mv and hv cables.
This means that they have a full rated insulation system which will consist of insulation semi con layers and a metallic shield.
Method of installation laying of low voltage cable.
Cable laying shall be started by rotating the drum in a direction recommended and marked side of the cable drum and cables are pulled accordingly.
The outer jacket is extruded hdpe with typically 2mm thickness.
Installation of cable trench covers cable protection tiles.
Cable shall be tested both before removal from cable drums and on site with a 1 kv insulation tester 5kv for mv cables.
Low voltage cables are usually three core xlpe insulated with aconcentric wave wound.
Laying the cables must heed the following parameters.
After all the cable is meant to.
Cables placement will take place mainly above ground in perforated ladder type cable trays.
There are so many parameters to consider while the laying of these cables.
Temperature range of the cable bending radius of the cable maximum tension of the cable weight of the cable as well as storage and cutting.
In a practical situation there are three main cable laying systems are used commonly for laying these under ground cables which are.
