CT or Shunt for Electricity Meters ?!

Status
Not open for further replies.

hm_fa_da

Full Member level 5
Joined
Sep 16, 2003
Messages
287
Helped
10
Reputation
20
Reaction score
4
Trophy points
1,298
Visit site
Activity points
3,217
Dear Friends,

for single phase KWH meter, i can use both CT and Shunt, which is more accurate ?!

and do you know what exactly 5(100)A mean ?!
i saw it means max 100A, but what does that 5A mean then when it supports up to 100A ?!!

Thanks & Best Regards
 

Hi,

I'd say a shunt is more accurate. But with it's low signal voltage you need to take care with amplifying the signal.
A wrong designed amplifier or a bad layout could easily make the overall performance worse than the CT.

5 (100)... For sure you could find reliable information in the internet.
I guess the 5A is for continous RMS current, the 100 is the peak current. But i'm not sure..

Klaus
 
100(5)A means 100A primary (input/measured) current and 5A (full scale) output current.

If you only need to measure AC currents (and you need galvanic isolation, too) a CT it's a better option, as it only requires a single external burden resistor (and maybe a simple rectifying/filtering circuit) to feed the output signal to your measuring circuit.
 

Hi,

(and maybe a simple rectifying/filtering circuit) to feed the output signal to your measuring circuit.
Click to expand...
Rectifying and filtering .. I don't think it is possible for a kWh meter, because you need phase shift information.

Klaus
 

Of course, I was talking about CT use in general terms. One could condition its output for specific measurements (peak, rms, average, phase shift).
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…