Recent content by mdaugird

There never is "CONTACT" when doing a High Potential Insulation test. We are trying to create a uniform electric field around the test time, We put 3-6KV on the conductor and measure the leakage current. There is always some leakage current, and we graph that over time...

That is a great idea, the fluidized bed can pump air while inserting the item and then we turn off the air and run the test. thank you very much rbelli1 for a great idea

Thank you all for your input but the time for the test does NOT allow for any JIG/Clamshell/Bracket structure. There are 14 different SKU # coming from the assembly lines into this testing fixture. There is no way someone can select the correct JIG/Clamshell/Bracket install it, run the test and...

There is a single bus bar, I am not sure what is meant by "The center bar being tested" The shapes change top dynamically making a bracket or JIG impractical. Only thing insulated is the single bus bar. this bus bar can bend back onto itself like a U shape, or S shape. The hope is to create a...

I am open to ideas of a way to test a bus bar for insulation flaws that has a 3D shape that varies in a production environment. I have a DC bus bar that when it was just straight we would run a high potential test on a metal table that is the reference plane, and then flip it over to test the...

thank you. I am hearing that the v(t) x i(t) is the power and that the reactive component is what is allowing it to go negative. When I run the spreadsheet with unit power factor it results in an all positive curve for VA. so looking at the watt meeter, how does a commercial meter have a VA and...

is what I am using for time domain real power and VA is just v(t) * i(t) is the spreadsheet accessible at the link? I couldn't attach it.

The graph shows real power always being positive, I was just surprised it was exactly in phase with the voltage. The VA in the graph follows your logic but not real power. Negative power from passive components would seem to be impossible and that is why I responded the way I did. I might be...

how? I see VA going negative, but how can real power go negative?

Please find attached a spreadsheet trying to plot an inductive/resistive circuit in the time domain and show instantaneous power and Volt Amperes. Logic tells me power can not go negative, but I am not sure my power plot is correct. Can someone please review the spreadsheet and chart to tell me...