Blog Reading
Home » Blog » Questions » XLPE/EPR underground cables

XLPE/EPR underground cables

Difference in properties, characteristics, application, installation, performance, code requirements, economics, etc. are the reasons why there are different types of underground conductors/cables especially in the predominantly used medium voltage cables. Current trend indicates that EPR cables are the preference over XLPE cables considering all the factors that are being evaluated. One very significant issue where EPR becomes more advantageous is on the issue of after installation "proof testing" of the cable. While EPR cables can take either a DC high pot testing procedure or AC High pot testing procedure, installation of XLPE cables do not guarantee / recommend a DC High pot testing on their cables.

One overlooked issue on the choice of high pot testing is that the components being tested on high potential testing is not only the cables, but all of the components that make up the cable run, including cable splices, cable terminations, separable connectors, etc. Great percentage of cable installation failures are not attributed to the cables but to the integrity of the splices and terminations, and these failures are predicted through elevated DC high potential tests.

Basically, Copper and Aluminum are the metals extensively used as conductors, even to underground cables.

I feel that, the following factors need to be considered for selecting type of insulation.
  1. Voltage level or Voltage grade.
  2. Type of system - AC or DC.
  3. Type of Application of load.
  4. Method of usage - Rigid or Flexible.
  5. Method of laying.
  6. Surrounding atmosphere - Ambient temperature, Presence of moisture, Presence of water and etc.
  7. Exposure to acids, alkalies, chemicals and fumes.
  8. Exposure to mechanical damages.
  9. Operating temperature.
  10. Cost.

An Electrical engineer should have to consider all above parameters and decide the type of insulation.

An XLPE cable with stands to higher operating currents compared PVC because XLPE with stands to higher operating temperatures.

You may also like:

Since the 21st century, China variable frequency drive industry is highly fission. Many foreign brands begin to set up factories in China, the implementation of the localization of business. See Appendix major ...
There are many ways of implementing SVPWM, it is having the third harmonic sine injected in to sine phase voltages to get better DC bus utilization (15% more). About the choice of a particular modulation, the ...
The question is about we have an unbalanced system under study and i found that power factor calculation does not obeys the well known geometrical relationship called power triangle nor the arithmetical ...
Advances in high-speed electric motor technology along with improvements in the cost and the performance of VFD (variable frequency drive) systems make direct coupling of a gearless electrical motor to a pump ...
Bridges are very common in Hi-Reli applications such as aircraft and almost necessary for inverters and variable frequency drives. I'm curious to hear which type of industry exhibited these "recent rumblings" ...
service The engineers in AC Drive China are very professional in Chinese automation industrial control fields, provide you comprehensive energy saving solutions.

Hot Tags


Frequency directly represents no of rotation of rotor for that machine, the higher the frequency the more the rotation of the rotor, i.e. the rpm of the motor there by result ... Due to power electronics technology and microelectronics technology rapid development, variable frequency drive reforms and upgrades speed also is faster, introduce new products, ... Since the 21st century, China variable frequency drive industry is highly fission. Many foreign brands begin to set up factories in China, the implementation of the localization ... My personal preference is for an AC line reactor simply because it does a better job of protecting the variable frequency drive from the line and the line from the drive. I've ... As nowadays there is a trend in green energy production and energy efficiency, what solutions/applications would you recommend in reduction consumed energy of a motor driven by ...

What's New