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Thank you SAK9 ! Happy to know the professional techniques in use around the world. Cable tunnel Hvac engineering indeed requires careful analysis and planning to avoid problems at advanced stages. I am closing the thread now as I got sufficient aspects to think about and proceed. Once again...

Thank you Littleinch, MintJulep! That was good information to do some homework. @ IRstuff, top of tunnel is 2meter below road surface.

Hi Chicopee, My concern is about temperature rise and associated derating of cables. Thank you.

Hi BenMacier, Request to provide some more details. Since it is directly running under the road for 350m, so we are finding it difficult to plan the ventillation. Can the manholes provided for maintenance access be treated as ventillation points ? Thank you !

Hello friends! I have 2m x 2m Power cable tunnel running for 300m under a road. It has 11kV cables arranged in trefoil on cable trays approx 50 numbers. What kind of ventillation system should I consider for this tunnel ? Thank you !

Hi DTR2011, Yes the CTs are inaccessible and housed inside the turret of the bushings. Thanks.

Hi bacon4life, Yes, the same was already completed. thanks.

Hi, Is there any method to conduct a differential stability test on Shunt reactor bushing CTs ? I understand that as compared to Transformers , reactor does not have any secondary so shorting on secondary and circulating a current high enough to check the CT secondary current is not possible...

Thanks Scotty ! What is the authoritative standard on this subject ? That is for sizing of DC MCB, DC feeder to trip, alarm-indication and Control circuits.

Hi, We are sizing the DC cables from DC Distribution board to the switch-gear and also the interrupting device (MCBs) at distribution board and load terminal. I understand we should use only the continuous loads for this purpose. Is the momentary load like CB closing coil , trip coil currents...