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Hello, I have noticed that in catalogues for AAAC conductors, the dc resistance at 20 degrees is given. Could someone please tell me why this resistance is given since it is not used in calculating the ac resistance at a particular temperature or frequency?

hello, I am trying to understand the theory behind ring main units (RMU). Could someone please explain the rationale behind using RMUs and also give me some links to articles that would provide further explanations?

Could someone please explain to me the kind of distribution network used in utility scale solar PV plants?

Hello, I have noticed that sometimes, values for 3 phase short circuit currents are lower than single phase short circuit currents. Could someone please explain this to me (I thought 3 phase faults were the most severe of all faults).

Thank you very much for your answers. I would like to know which of these two scenarios is better: 1. a 4MWp PV plant with 4 X 1MVa transformers or a 4MWp PV plant with 2 X 2MVa transformers.

Hello, I would like to know the factors to consider when one is choosing a transformer (or transformers) for a solar PV plant. In the design of utility scale plants (eg. 4MWp and above), some engineers choose several 1 MVa transformers and others choose one big transformer for their design...

Hello, I am considering enrolling in an online power system course (power system protection). Could anyone suggest some very good programs that i can enrol in? Could anyone also suggest some power system training courses that are available on DVD or CD that i can purchase? Thank you very much.

could anyone suggest some reading materials or videos that can help me get a better understanding of FRT? thanks

thank you all very much.

i know that usually wind turbines are required to inject reactive current into the power system during a fault to stabilize the system but i'm wondering if this current injected wouldn't just make the fault much worse.

when there's a fault and reactive current is being injected into the power system, wouldn't this reactive current contribute to the fault current?

if an inverter supports a power system by feeding it reactive current during a fault, doesn't that inhibit the anti-islanding feature of the inverter? please help me understand FTR(fault ride through) and anti-islanding!!

Thanks

hi, so does XHL mean that the reactance of the low side is transferred to the high side?

I need help understand the relationship between a transformer's impedance in per unit and it's XHL.

Hello, i'm trying to find some self study videos on power system protection. i found a few videos by bill anderson on youtube and i was wondering if anyone knew how i could get the complete set of videos either via download or by buying online. I'd also like to know if any one could recommend...