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I need to understand when and why should i use delta connected CT´s for ocrecurrent protection. I saw this kind of connection to protect grounding transformers, and one to protect a bus bar with tap relay adjusted to pickup 1.2 times 3 transformer rating capacity thanks

A question. How do I specify the correct number or characteristic of insulators for a transmission line, at 3700 meters (12200 feets) over the sea, working at 69 kV. The catalogs of insulators show the Critical FlashOver and not the BIL. I understand that, to specify the insulation of the...

I am looking for papers "unbalanced power flow", or somebody have a matlab program that i can use? Thanks

Someboy can explain the difference between a relay coil working in Direct Current and Alternating Current. What can I do to make an AC relay work with DC. For example a I have a relay with coil for 220 VAC and i want it to be energized with 125 V DC. Thanks Alvaro

Thank you for your answer. I would like ou comment the 1/3 rule. I really do not know that rule. Thank you again.

I need papers relative to optimal capacitor placement using sensitivity factors from newtow raphson jacobian matrix. If somebody can help me, or can explain me how this method works? Thank you.

Dear Friends First of all, thank you for your answers. Question? Dou you think it´s enough to use grounding poles to connect the cable guard of the transmission line. Thanks

Dear experts We are using reinforced concrete poles in 69 kV transmission line, and to connect to earth the cable guard, we are using an inner cable that travel by mean of the pole, and it´s in contact with metal frame of the pole. Normally we connect teh cable guard by an external cable, not...