Hi:
Do anyone have the experince about the cleaning the casting parts with ultra-sound wave before these parts are painted.
we plan to install a new painted workshop, in the form time, we clean the casting part with acid, pure water and other chemical to clean the casting parts( aluminum), now...
As we know, to protect the instrument in the secondary of the metering CT, there is a factor Fs ( instrumnet security factor) for metering CT, it means when a fault occurs in the primary, the ration of growing about the secondary current can not be as high as the primary side. if the metering CT...
Yes, I mean that for the zero-squence CT, we have 100/5,200/5 and so on.How can I decide which sort of ratio I should use, which calculation is based on when I decide the CT ratio?
Thanks a lot.
Dear everyone:
Would you like to give me some hint about how can I decide the primary current for the zero-sequence CT? In my concept, only in the condition of earthing fault or 3 phases is unbalanced, the zero-sequence current created and normarlly it will big especial when the 1 phase...
In Excel, we can filter the data, when we want to input the filting critiria, we can choose or input from the filter list box, but how can I get the quantity of the items listed in this box?
