- #1

aemla

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- TL;DR Summary
- How would one measure (with a meter) active power of a single phase 208 VAC circuit where L1 and L2 are the only wires?

Good day,

I hope to understand how to use a 3 phase energy meter to measure single phase 208 VAC circuit.

The basic idea seems simple, yet, complex meters don't seem to have this ability.

Would anyone be able to describe what kind of information one would need from a digital 3 phase meter to calculate/determine active power of single phase 208 VAC circuit?

Upstream power transformer: Delta to Wye 120/208 VAC

Per my understanding, the most complex piece of data I would need is the phase angle between resultant voltage wave (between L1-L2) and current.

Most industrial meters provide phase angles for individual phases and phase angles between different voltage hot legs. Literature also seems confusing since two different angles are referred to as the phase angle. Some meter documents call the phase angle between voltage and current as the "displacement angle" and phase angle between different voltage hot legs as the "phase angle".

Any sample calculation or a link to a meter that has been proven to work would be greatly appreciated.

Thank you!

I hope to understand how to use a 3 phase energy meter to measure single phase 208 VAC circuit.

The basic idea seems simple, yet, complex meters don't seem to have this ability.

Would anyone be able to describe what kind of information one would need from a digital 3 phase meter to calculate/determine active power of single phase 208 VAC circuit?

Upstream power transformer: Delta to Wye 120/208 VAC

Per my understanding, the most complex piece of data I would need is the phase angle between resultant voltage wave (between L1-L2) and current.

Most industrial meters provide phase angles for individual phases and phase angles between different voltage hot legs. Literature also seems confusing since two different angles are referred to as the phase angle. Some meter documents call the phase angle between voltage and current as the "displacement angle" and phase angle between different voltage hot legs as the "phase angle".

Any sample calculation or a link to a meter that has been proven to work would be greatly appreciated.

Thank you!