Recent content by frankatlem

Can anyone point me to a reliable site with equations for calculation of instantaneous values of zero, positive and negative phase sequence?

I've not actually made any readings of ELFI or PSCC on a UPS but I would say the readings you get will totally depend on the design of the UPS. I would suggest that the higher the power rating the lower the ELFI (higher the PSCC). The impedance in this case is going to be down to the...

I've already posted this question but I should have been more specific. I'm looking for a earth tester for the grounding systems of electricity pylons (towers) where there are multiple ground paths. I've seen a variety of products which induce voltage using a current transformer but they can be...

Siemens have a variety of PLCs which appear in their own weighing systems and those of other manufacturers. The Simatic range is most prevalent.

I should have been more specific. I've seen a variety of products which induce voltage using a current transformer but they can be of limited use when try to measure on the legs of towers (although I have seen one current clamp with a 320mm diameter). The device I'm trying to track down uses...

I am aware of a product on the market from (I think?) ABB for testing of earth electrodes without disconnecting the overhead earth wire. I've looked all over the net for information on this product but can't find any. Can anyone advise of such a tester?