Recent content by clembo

So far I have: The max temperature my oil filled transformer can handle without damage or ageing occurring is 85 deg. With an ambient temperature of 35 deg and a load of 500 kVA the transformer will run continuously quite happy. My transformer time constant is 1.5 Ratio of copper losses to...

Thank you Scottdave that is very helpful.

Homework Statement An oil-filled transformer has a c.m.r. of 500 kVA which allows it to run continuously in an ambient of 35°C with an oil temperature rise of 50°C. The transformer has a time constant of 1.5. hours and the ratio of copper losses to iron losses at c.m.r. is 1.5:1. After...

Hello there, I am struggling with the maths of the equation for b.) Zin = Zo [ ( (ZL COS βℓ) + (jZo SIN βℓ) ) / ( (Zo COS βℓ) + (jZL SIN βℓ) ) ] I have attached my working out and have computed the answer with my calculator in Radians but am not at all confident on the answer I have achieved.

Ahhh I see thank you for your assistance.

Does this make any difference to the overall equation for Vth as when I follow the equation through I end up with 2490 + J1660 = 166 - J248 or 299.26 /_ -56.31deg...

Hello gneill, thanks for the link to the previous thread about this topic. I have been on this question now for about three weeks... finally I have something like an answer but my Thevenins Current and Superposition Current are not matching up. I have swapped between Polar and Rectangular...

Hello just wondering if any of you clever people would be able to give me some guidance on an assignment question I have been given. The notes for the course are terrible and they seem to love to through terminologies into the assignments which have not been covered in the course notes. So does...