Mains current sensing to computer...

[Geir]

Hi,

I'm looking for mains 0.1 - 150A range current sensors with some kind of
computer interface: 1-wire, RS232/485 / Ethernet etc...

Induction (transformer) or Hall type, one or three phase.

Not high accuracy, 5% would be ok. Hopefully not too expensive ;-)

Thanks a lot for any hint, URL or comment.

regards

Geir

 

[whit3rd]

On Sep 25, 5:28 am, Geir <gei...@gmail.com> wrote:

I'm looking for mains 0.1 - 150A range current sensors with some kind of
computer interface:  1-wire, RS232/485 / Ethernet etc...

Induction (transformer) or Hall type, one or three phase.

Not high accuracy, 5% would be ok.  Hopefully not too expensive ;-)

Are you sure you want to measure current? Not energy or
power?

The usual bolted-to-the-building power meters are accurate and
mass-produced, and made with lots of readout options. The
readout is in energy units, but you can determine power by making
multiple
timed determinations of energy use. And, if your accuracy only
need be 5%, it might be possible to estimate current from power,
if the power factor is either constant or specified-within-limits.
Most sources of up to 150A are held to narrow voltage limits,
in my experience.

 

[Geir]

whit3rd skrev:

On Sep 25, 5:28 am, Geir <gei...@gmail.com> wrote:

I'm looking for mains 0.1 - 150A range current sensors with some kind of
computer interface: 1-wire, RS232/485 / Ethernet etc...

Induction (transformer) or Hall type, one or three phase.

Not high accuracy, 5% would be ok. Hopefully not too expensive ;-)

Are you sure you want to measure current? Not energy or
power?

The usual bolted-to-the-building power meters are accurate and
mass-produced, and made with lots of readout options. The
readout is in energy units, but you can determine power by making
multiple
timed determinations of energy use. And, if your accuracy only
need be 5%, it might be possible to estimate current from power,
if the power factor is either constant or specified-within-limits.
Most sources of up to 150A are held to narrow voltage limits,
in my experience.

I really want to measure enery or power. However I have limited space
and I wonder if you (or someone else) have suggestions on where to find
such pickup devices. I hoped that there existed small transformers with
three holes to put the live insulated wires through and which gave me a
readable output in mV or mA related to the amount of energy.

regards

Tor