How to measure ac current and voltage without using ct sensor?

Other Hardware Sensors
1

I want to measure current and voltage of AC 220V without using CT sensor. I considered AC724, ​​but it seems that voltage measurement is not possible. Is there any IC or module that can measure both AC voltage and current? Thank you.

2

It obviously also depends on the current range.
Have a look at hlw8012 or bl0937.

3

What current range do you need to measure?

4

Different sensors are needed for current and voltage. For current it is safest to use noncontact methods, and your choices are limited to two: Hall or CT sensors.

5

Hi,

you could use the ADE9112, it’s a SPI Σ-Δ ADC which has 2 isolated channels (the ones needed to measure voltage and current) for shunt-based energy metering applications.

6

I would prefer to use transformers to give you physical Distance from the high voltages , if you are experimenting with stuff it’s much safer - you can put the transformers ( and the cat burden resistor ) in a separate housing.

you could consider just measuring current and assume voltage is fixed value ?

if you want to measure power ,look at meters with pulse outputs - problem solved and no sampling of waveforms to work out power . Ready packaged , accurate , safe

7

The measured current is about 5 to 10 A.

8

have a look at the 10amp version of the PZEM-004T-V3.0

image
image320×186 33.5 KB

the 100amp version uses a CT

9

If you are planning on using n Arduino in your system I don't recommend using any non-isolated device.

You should have a look here:

10

I would second that!

the PZEM-004T does have op-isolators between the measurement circuit and the P2 connector to the microcomputer but one is still dealing with mains voltages

when evaluating the PZEM-004T 100A this is the test setup I used

image
image660×609 54.7 KB

the PZEM-004T is in the white enclosure and a mains isolating transformer is used to supply the test load

11

Probably no IC can do this. To measure AC mains I use a plug in power supply (aka wall wart) with an AC output. Then all you have to do is measure the output of this supply. Much safer than direct.

12

some results I got from the UNO + PZEM-004T 100A setup in post 10

Custom Address:1
Voltage: 247.30V
Current: 0.00A
Power: 0.00W
Energy: 0.023kWh
Frequency: 50.0Hz
PF: 0.00

Custom Address:1
Voltage: 247.70V
Current: 0.00A
Power: 0.00W
Energy: 0.023kWh
Frequency: 50.0Hz
PF: 0.00

Custom Address:1
Voltage: 247.80V
Current: 0.00A
Power: 0.00W
Energy: 0.023kWh
Frequency: 50.0Hz
PF: 0.00



Custom Address:1
Voltage: 209.60V
Current: 3.91A
Power: 819.10W
Energy: 0.027kWh
Frequency: 50.0Hz
PF: 1.00

Custom Address:1
Voltage: 209.70V
Current: 3.91A
Power: 819.30W
Energy: 0.028kWh
Frequency: 50.0Hz
PF: 1.00

Custom Address:1
Voltage: 183.20V
Current: 6.72A
Power: 1231.20W
Energy: 0.030kWh
Frequency: 50.0Hz
PF: 1.00

Custom Address:1
Voltage: 182.50V
Current: 6.69A
Power: 1221.50W
Energy: 0.031kWh
Frequency: 50.0Hz
PF: 1.00

Custom Address:1
Voltage: 181.90V
Current: 6.67A
Power: 1213.40W
Energy: 0.033kWh
Frequency: 50.0Hz
PF: 1.00

compare UNO + PZEM-004T 100A readings with multimeter (voltage) and current clamp meter

  PZEMsensor          meter
voltage current  voltage current
  247     0        245     0
  209    3.92      210    3.83
  181    6.72      181    6.5

the voltage readings were dropping because I was overloading the isolation transformer