for a electricity meter (I dont know how u call a meter measuring watt and var (cap and ind. ) at the same time!) how can u summarize the connection rules? I mean say if phase sequence is wrong but polarities are true measurement is true or false or vice versa, or one of the phases is wrong polarity connected but phase sequences are true etc.. For different cases is there any simple rule??
electricity i meter
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PowerQualityDoctor
Senior Member
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- Israel
I have read your post several times, but still cannot understand it. I assume that I am not the only one, as you do not have any replies. Please post some clarifications.
rcwilson
Senior Member
- Location
- Redmond, WA
Meters can be connected using many different schemes: 3 element, 2-1/2 element, with or without CT's and VT's. Each scheme has one correct connection to obtain correct numbers for all measurements (Watthours, +/- watts, +/-vars, power factor, etc.)
There are no names for other connections except "wrong".
There are no names for other connections except "wrong".
rcwilson
Senior Member
- Location
- Redmond, WA
The only rule is to wire it up correctly in accordance with the utility's specfications or according to the meter manufacturer's drawings.
Yes, you could put the CT's in backwards and then swap the secondary leads to get the correct polarity into the meter so all readings woudl be correct. Some utilities and inspectors woudl make you change the CT's to match their standards and others would not care as long as the reading is correct.
So what is your question?
Yes, you could put the CT's in backwards and then swap the secondary leads to get the correct polarity into the meter so all readings woudl be correct. Some utilities and inspectors woudl make you change the CT's to match their standards and others would not care as long as the reading is correct.
So what is your question?
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