Single phase split supply

Question

Hi, 
 Jamaica utilizes a single phase split supply; 110/220v, same as in the US. 
 1. What devices would you recommend for this application? 
 2. Would it be possible to utilize a device such as the ADE7753, or the ADE7755 by placing two CT's in series, thus adding the currents vectorialy? The voltage would be sampled across L1 and L2?

dlath · Accepted Answer

Hi Donovanpl123, 
 With a single phase split supply that you mention, the most typical setup I see is to measure with 2 current sensors, one for each phase, and then two voltage measurements, one for each phase going to the neutral. This means that you need 4 channels, 2 current and 2 voltage to measure this system. An appropriate IC would be the ADE7878A for example, this is a poly-phase metering IC and therefore 4 channels can be used to measure the two phases and data from the leftover channels can be disregarded. 
 I would not recommend putting the output of two CT's in series because it could negatively affect the measurement accuracy. The other problem with using a single-phase metering IC is that both voltage channels can't be measured. If only 2 channels are used, 1 for voltage and 1 for current then there is a lot of information that is lost. For example, if a line goes down, it will be difficult to understand which one. In addition you will not be able to get any per phase specific energy or metrology. 
 Regards, 
 Dlath)

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Single phase split supply