Previous in Forum: Water Flow Control   Next in Forum: Grounding of 1C Unarmored Cable
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
2 comments
Rate Comments: Nested
Anonymous Poster #1

One Single Phase kWh Meter to Measure 3 Phase Power

04/20/2013 10:44 AM

Hi Engineers,

I have a mini hydro project. It has a 3 phase balanced alternator, low voltage of 24 -36 volts to charge battery via rectifier and for resistive loads. How can I measure the power by using one single phase household kwh meter ? Where may I get the wiring diagram? Many thanks.

Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#1

Re: One Single phase kwh meter to measure 3 phase power

04/20/2013 11:04 AM

Depends on the meter design....and whether the load is balanced...

http://en.wikipedia.org/wiki/Blondel's_theorem

__________________
 All living things seek to control their own destiny....this is the purpose of life
Reply
tcmtech
Guru

Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#2

Re: One Single phase kwh meter to measure 3 phase power

04/20/2013 12:03 PM

You will have to reconfigure your alternators three phases into a "Zig Zag" configuration so that it is putting out single phase power from there your wattmeter will work just fine but your system will now be a 48 - 72 volt output.

A Zig Zag is basicly a delta configuration with one phase shifted one way or the other turning the triangular configuration into a roughly Z shape.

The second option is you just measure one phase and multiply your readings by three assuming that your load is reasonably balanced between the phases.
Reply
Reply to Forum Thread
Have a Different Question?
2 comments

Previous in Forum: Water Flow Control   Next in Forum: Grounding of 1C Unarmored Cable

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (52 right now)
Show Members
Advertisement