Recent content by Casper Hansen

Sorry I did not quite get what you are asking for?

If i know the voltage but need to find the sum of impedances in order to calculate the current

My post have been updated with nodes A and B

Homework Statement I have trouble to find the right procedure to transform the circuit below to a thevenin equivalent. I am looking for a symbolic solution a step by step guidance of where to start and how to add/locate all the impedance in series and parallel in order to calculate the sum of Z...

I found this standard IEC 60216 series anyone have been working with it? I have tried that they could not tell. If i have two temperature points i can estimate the activation energy? lets say: operation temperature: 90 [degC] @ 20 years (631 138 519 s) Short circuit temperature 250 [degC] @...

Hi PF Is it possible to perform accelerated lifetime test of thermal ageing on power cables? Let's assume that the cable manufacturer guarantees a service life time of 20 years at max operation temperature 90 [degC]. Is it possible to estimate the expected life time of a cable if I choose to...

Yes according to the article the PD limiting values for all the other materials is way above the PD values for XLPE, which makes me think that the XLPE is a weak material to withstand PD. I did PD measurement on a cable (testing XLPE insulation barrier) with a great result of PD level < 5 pC I...

Sorry for my late response. I have found this, see Figure 9 : https://www.cablejoints.co.uk/upload/Partial_Discharge_(PD)_Test_&_Measurement_for_High_Voltage_Cables___SEBA_OWTS.pdf and this, see Table C2...

PD test is applied to the equipment but that is the insulation that is being tested. For instance PD test on cables are testing the XLPE insulation barrier. If the insulation barrier was made of another material, the PD acceptance criteria would be different.

Hi PF According to IEC 60885-2 and IEC 60270 the acceptance criteria in partial discharge (PD) measurements on high voltage cable insulation state that PD level should be below (< 5 pC). The insulation material that is refereed to is often XLPE which is a sensitive insulation to PD. Other...

Thanks... Ya i understand that a wire carrying a current create a magnet field B (magnetic flux density) and that ΦB (magnetic flux) is a product of the B and a loop area dA that enclose the B field. ( ΦB is the total magnetic flux in the area that the loop enclose). Cable B is a signal cable...

no, it's not homework, but something I've encountered several times now that made me think about does the induced voltage de- or increase with distance. I have uploaded a image and diagram, see attachment.

Hello How do I calculate the induced voltage in a passive signal cable that runs parallel to a 1 phase power cable? Cable A is the power cable I = 500 A Cable B passive signal cable where: D= 209.65 mm: distance between wires ( center wire to center wire) r= 10 mm: radios of each wire f=60...