Showing posts from June, 2015

Underground Power Cable Site Test after Installation

Underground Power Cable  Site Test after Installation:

Site test after installation underground power cable is required to confirm that the cable are installed properly and there is no any damage during laying.

Following site test should carry out for underground cable after installation:

1.Phase Checking Test 2.10 kV Sheath Integrity Test 3.Insulation Resistance Test 4.DC High Voltage Test 5.No load Test

For safe and effective energization of underground cable power line  site test after installation is necessary.

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Continuous Current Ratings of XLPE Insulated Underground Power Cable

Continuous Current Ratings of  XLPEInsulated Underground Power Cable:

Continuous current ratings or continuous current carrying capacity of XLPE (Crossed Poly Ethylene) insulated underground power cable is not same all the time. Current carrying capacity of cable depends on cable laying conditions and its ambient temperature. The major considerable conditions for current carrying capacity of underground power cables are as-

Ground Temperature of cable vicinity; Depth of cable laying ; Soil Thermal Resistivity; Cable Ambient Temperature; Maximum Conductor Temperature; Cable Formation; System Frequency; Load Factor, etc.

Cable Construction:Cable construction may be various types depending on voltage ratings, conductor size and type, sheath type etc. Here we tried to show continuous current carrying capacity varies due to cable laying in direct buried, in pipe duct and trefoil  & flat position in air  for aluminium sheath, Lead sheath or copper wire shield XLPE insulated PE or PVC outer sheath…