Tracing the 3-phases of a 3-phase generator
Tracing the 3-phases of a 3-phase generator
(OP)
Hello,
I have a 3-phase generator connected to a power grid. The power grid supplies electrical power to many one phase systems. I know that the load should be distributed equally on the three phases of the generator. The guy that made the grid installation did not label the power lines, and now i'm stuck with an unbalanced load on the 3-phases.
Is there a way or a device that allow me to trace/detect each line in the power grid connected to which phase of the generator's 3-phases?
i can't cut of power on the grid ,so cutting off power on one phase and tracing it is not an option.
Thank you.
I have a 3-phase generator connected to a power grid. The power grid supplies electrical power to many one phase systems. I know that the load should be distributed equally on the three phases of the generator. The guy that made the grid installation did not label the power lines, and now i'm stuck with an unbalanced load on the 3-phases.
Is there a way or a device that allow me to trace/detect each line in the power grid connected to which phase of the generator's 3-phases?
i can't cut of power on the grid ,so cutting off power on one phase and tracing it is not an option.
Thank you.






RE: Tracing the 3-phases of a 3-phase generator
RE: Tracing the 3-phases of a 3-phase generator
RE: Tracing the 3-phases of a 3-phase generator
Even if you know which phase is connected to which phase, so what.
An unbalance is a load issue, not a generator connection issue.
Use a common device known as a clamp-on Ammeter sometimes called an Amprobe.
Measure the current on the incoming feeder to each breaker panel and move loads from phase to phase until the panel is balanced. repeat at each panel.
If you must know which phase is which you can build a "Thumper".
Use any load from about 5 Amps to about 10 Amps.
Connect it to one phase or in parallel with a load. Use a timer or a helper to connect it for 5 seconds and disconnect it for 5 seconds. Repeat the 5 second on, 5 second off cycle. Use an Amprobe unstream to locate the phase conductor with the current changing up and down.
Hire an electrician.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Tracing the 3-phases of a 3-phase generator
RE: Tracing the 3-phases of a 3-phase generator
@davidbeach yes this kind of device that i'm looking for do you know the name of such device?
@waross you are absolutely right. However, in order to balance the load i wanna know each load connected to which phase so I can exchange loads between phases. The idea of moving loads until is balanced does not work in my case because there is KM distances between loads. Using the "Thumper" technique could work thank you!.
@amtprot i don't haven a problem with phase sequence. i just want to know wich phase is which to balance the load.
Thank you!
RE: Tracing the 3-phases of a 3-phase generator
If isolated, is there only one generator? If so, what will you do if it trips?
What is the distribution voltage?
Is the load served via overhead conductor or buried cable?
If by overhead conductor, in my utility we would solve this by standing with our back to the source, then choosing a phase denoting means like top/centre/bottom, or left/centre/right, or north/centre/south, or east/centre/west, whatever. Then we would traverse the entire line from source to every load, sketching a schematic on paper and measuring and recording individual phase currents at the source and at every tap....you should have the idea by now.
One phase detector of which I am aware is the Avistar...
The "thumper" approach could be employed for buried cables where the individual phases are unmarked; presumably these terminate in a daisy-chain of metalclad switchgear, or pad-mount transformers, or something like that...and if that is the case, it would have been helpful to have said so right up front.
Remember: more information yields better answers.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Tracing the 3-phases of a 3-phase generator
There is two generators one work as a backup
Distribution voltage is 220V
the load is served via overhead cables.
The system grid is already installed and there is no schematics.
RE: Tracing the 3-phases of a 3-phase generator
You will be able to identify this phase at the generator and then label it. For a one time job, keep the cost and complexity down.
Bill
--------------------
"Why not the best?"
Jimmy Carter