transformer taps
- Thread starter fuzzbutt
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ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: transformer taps
No required procedure that I know of.
I like to have it set for the nominal secondary voltage at the expected connected load.
No required procedure that I know of.
I like to have it set for the nominal secondary voltage at the expected connected load.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: transformer taps
I'm not familiar with Ramsay Test.
Set the primary tap so that you get the voltage on the secondary you want. As you load the secondary, the secondary voltage will drop in proportion to the listed impedance of transformer.
Half load with a 5% transformer, drops the secondary voltage 2.5%
I'm not familiar with Ramsay Test.
Set the primary tap so that you get the voltage on the secondary you want. As you load the secondary, the secondary voltage will drop in proportion to the listed impedance of transformer.
Half load with a 5% transformer, drops the secondary voltage 2.5%
brian john
Senior Member
- Location
- Leesburg, VA
Re: transformer taps
In our area the utilities offer (depending on the jurisdiction of the project) 480/277 or 460/265, it is up to the contractor to determine the nominal voltage and set taps accordingly. In the past we have had projects with low voltage due to a variety of problems the utility would not or could not address, we monitored the secondary voltage for a extended period of time and adjusted taps to accommodate the low primary voltage.
We rechecked the voltage periodically as voltage levels can change based upon time of year and loads on the distribution system.
[ May 31, 2005, 07:52 AM: Message edited by: brian john ]
In our area the utilities offer (depending on the jurisdiction of the project) 480/277 or 460/265, it is up to the contractor to determine the nominal voltage and set taps accordingly. In the past we have had projects with low voltage due to a variety of problems the utility would not or could not address, we monitored the secondary voltage for a extended period of time and adjusted taps to accommodate the low primary voltage.
We rechecked the voltage periodically as voltage levels can change based upon time of year and loads on the distribution system.
[ May 31, 2005, 07:52 AM: Message edited by: brian john ]
john m. caloggero
Senior Member
Re: transformer taps
Measure the supply voltage to the primary. Set the primary taps to the measured voltage. Set the secondary taps to the desired nominal voltage. Check the output voltage after making the connections. Measure the primary and secondary voltage under load.
Measure the supply voltage to the primary. Set the primary taps to the measured voltage. Set the secondary taps to the desired nominal voltage. Check the output voltage after making the connections. Measure the primary and secondary voltage under load.
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