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Thanks to all, especially Benjamin Lanz. I have not made the decision on whether to use concrete chambers which may have phase segregration and each chamber would only cover one circuit. Testing of the joints and fault finding is clearly an issue irrespective of the choice. If you can help...

Cuky2000 Thanks for your feedback. You provide a calculation for step and touch voltages. How do calculate the allowable step and touch voltages as i have understood that 50V was theh limit. Are you aware of any installations where thay have successfully used insulated conductors?

Sorry i want to clarify/revise my original statement. Is is acceptable considering touch and step voltages to choose an insulated ground conductor to act as the ring around equipment and buildings? I see lots of references that it is acceptable to use bare or insulated grounding conductor but...

THe grounding system design is made of rings of conductor that is earthed to several earthing rods. The rings or loops are surrounding specific areas. The soil resitivity is low. The choice has earthing conductor has been chosen as insulated rather than bare due to the corrosive affects of the...

Does anybody have experience of cable joints to this magnitude and only install in sand?

We have 96 joints at 33kV. Our cables are installed within a common corridor. Is there a safety issue or restriction with respect to future inspections, Is it easier to test when we have concrete chambers rather than just laid in sand? Should we look at the cable manufacturer to perform the...

thank you so far for the responses. The utility is in Qatar. Does anybody have any references to papers or practical situations?

We are purchasing 3* 35MW generators for a plant that has a load requirement of 90MW. These generators are limited by the steam consumption to overall 60MW therefore we are importing from the electrical utility 30MW. We have a 33/33 OLTC as the grid transformer. For the generators the AVR...

Our plant will be connecting to the local electrical utility via two feeders of 33kV. Each feeder will be rated at 700Amps. The distance between the utility and our plant is 5500 metres. These cables will be installed in a common power corridor. We have selected to use 2*630sqmm single cores per...