I need help with choosing Current Transformer. Which ratio? 1:50, 1:100, 1:2000? And also how to use aproppiate burdeon resistor. Do you have some recomended CT for ADE7953?Thanks
Apologies for the delay, a very helpful resource is on Pages 3-5 of http://www.analog.com/media/en/technical-documentation/application-notes/AN-639.pdf, in the "Current Sensors and Input Section". In the end, it comes down to your specific application and what you are looking for but typically CT's used with the ADE7953 will have a turns ration of 1500:1 to 3000:1 and the burden is chosen in such a way that the maximum input of +/-500mV is never exceeded.
Ok, what if I use 50:1 current transformer (this one) ? I just use propiete burden resistor and that will work? Which are plus and which minus of that ratio?
Regards that I have one more question, can I use voltage transformer (220V to 9V, AC signal) for galvanic isolation of VN, VP channel ?
A typical CT used in ADE7953 has 1500:1 to 3000:1 recommended range depending on the application. A CT with a lower turns ratio might impress a high secondary current and this makes choosing the burden difficult. Another concern is the power dissipation of the burden resistor. You may refer to AN-639 (https://ez.analog.com/external-link.jspa?url=http%3A%2F%2Fwww.analog.com%2Fmedia%2Fen%2Ftechnical-documentation%2Fapplication-notes%2FAN-639.pdf) for a list of CT manufacturers.A voltage transformer can be certainly used for voltage measurement. A Tx from 220 to 9 Vac for the voltage channel needs an attenuation network. This is to ensure that the voltage entering the input of the ADE7953 is within the appropriate level.
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