High volatge cable selection
High volatge cable selection
(OP)
Can anyone guide me for selection of cables for HV transformer and motors.AS per catalogues there are two types of cables earthed and unearthed where to use which and what is the criteria for that.
Can anyone guide me or where in I should look for it.
Is the calculation similar to the low volatge or anychange
Thanks in advance
Can anyone guide me or where in I should look for it.
Is the calculation similar to the low volatge or anychange
Thanks in advance






RE: High volatge cable selection
Could you please follow up with circuit voltage, system-grounding method and anticipated cable size?
Does your query involve shielded [screened?] versus non-shielded [unscreened] cables?
RE: High volatge cable selection
100% insulation - ground faults clear within 1 minute
133% insulation - ground faults clear within 60 minutes
173% insulation - ground faults can persist indefinitely
An unearthed system would presumably use 173% because ground faults usually don't automatically trip.
RE: High volatge cable selection
If you are not sure how to start, probably a good advise to hire an experience-consulting engineer and work together designing the system to operate safe, economical and efficient manner. This is a great way to learn.
RE: High volatge cable selection
The system voltage is 11KV and anticipated cable size is 50 mm2.
RE: High volatge cable selection
If you are using :
a) 3 core 11kV armoured cable and
b) jointing kits to terminate the cable and
c) it is possible to earth the outer sheath,
then you may select Earthed cable which is generally cheaper
Usually when you are using 11kV cable for giving connection to a step-down transformer, motors, metering equipment and switchgear, Earthed cable is used.
When you are using HV cable for joining two sections of overhead 3 wire, 11 kV feeder you may use Un-Earthed cable.
RE: High volatge cable selection