Question about SQUARE D EE30T3HB Transformer,In 480,Out 208Y/120,30KVA UPS System

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45 KVA 3 phase 480 to 208/120vac transformer Overheating. All 6 units on site.

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Check for excessive harmonics.

Posted on Oct 17, 2013

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I need to convert 8 kw to kva


go google and type in---convert kw to kva--- there are heaps of sites with calculators including some u-tube videos

there are calculators with single phase and 3 phase calculations

Dec 10, 2016 | Electrical Supplies

1 Answer

How many kva has a 3 phase 10.5kw generator?


About 10.5. One KVA just about equals one kilowatt, because one VA just about equals one watt. Not exactly, under all conditions, but it's pretty close for most purposes.

Jul 22, 2014 | Honda Electrical Supplies

1 Answer

1993 KD15 series miller delta weld 300 can it be hooked up to 220 single phase


Theoretically yes, but it would be a great deal of work and would draw a little over 6 times the current it did when on three phase power.

It would entail replacing the fan motors, connecting the 6 windings of the 3 phase primary in phase and in parallel. Plus adding a 115 circuit " tapping off half of the 220 single phase" incoming power for some aspects.

The control board would also need modifications as well. because it uses 3 current sense transformers and you would need to rework that circuit to compensate.

The short answer if you were wanting to set one up for home use- just invest in a "Sidekick" They did have a 240 volt single phase version, and if you consider the time invested to change something over that could trip the 200 amp service breaker, if you value your time- the money for a Sidekick would be well worth it.

If you want proof- open up the primary side of the Deltaweld and look at all of those connections you have before you- you would not be using 1/3 of them, and you would need to take the time to make sure the 6 windings were in phase otherise the transformer burns out- it may burn out anyway because the current draw increase beacause all the low impedance windings are now in parallel on a nominally lower voltage- just the potential of fire from that arrangement makes the money spent for a Sidekick to be considered "cheap insurance."

Mar 29, 2012 | Miller Welding Tools

1 Answer

1 phase , 50 Hz, 20 KVA , 2200/220 v , is connected as an auto transformer of step up type . Determine , a. The auto-transformer transformation ratio . b. Auto-transformer primary and secondary currents...


This is NOT a forum for college problem solutions. How would you have a 20 KVA transformer and an Atlas Sound AF140... these are different animals... Autotransformer is a more efficient connection when it is possible... the transformer will step the 220 up to 2200+220 volts ignoring the copper loss voltage. For proper designed transformers the primary and secondary copper losses should be close to equal... but in autotransformer connection the efficiency is improved as the added voltage of the supply going to the high voltage winding power does NOT suffer and add to the current required in the primary of this connection. The purpose of this problem is for you to discover that the efficiency of autoformer connection is higher than of a simple step up connection. Now with this carefully work the problem... The ratio I have all but given you... It is unclear what is considered full load here so I would base it on regular connection at 20 KVA at 2200 volts to calculate what the currents would be primary and secondary.in normal connection... calculate resistance of primary and secondary ASSUMING equal losses primary and secondary. What isn't clear is if the loss figures are for the autoformer connection OR just the specs for normal connection. The power factor kink adds to the misery. Approach this problem by making an equivalent circuit of the transformer showing the primary and secondary resistances... again the question is are the loss figures the specs of the transformer or the actual running values for the system....

Sep 11, 2011 | Atlas Sound AF140 140 Watt Autotransformer

1 Answer

LP126HD3A rated for 265 volts AC single phase I have 240V ac single phase, how can I use this unit on 240V ac


You'd need to supply a "Buck-Boost" transformer to do this properly. Technically, the 265 VAC is one hot leg and neutral of a 480 VAC 3 Phase Y system that measures 277 VAC. The 265 number comes from this:

265 is the standard nameplate voltage for a 277 volt motor or AC unit.

230 is standard name plate for 240.
200 is standard name plate for 208
460 is standard name plate for 480.
110 is standard name plate for 120.

Most electricians call the hot leg / neutral circuit "277V AC".

Some popular "Buck-Boost" transformers will convert 208 to 240 and 240 to 208 volt systems, and 240 to 277 and 277 to 240 volt systems - among many other variations. These are auto-transformers as the primary secondary windings share a connection. KVA ratings differ significantly from name plate because of this fact. You should contact a qualified electrician to not only size, but wire the transformer for you. Failure to install a Buck-Boost transformer - and running this unit on 240V AC mains will cause premature failure of motors - fans and compressor due to overheating. This can also result in a fire hazard.

I hope this helps and good luck!

Sep 06, 2011 | LG LP126HD3A Air Conditioner

2 Answers

Hi I purchase a 3 ton -3 phase condensing unit. Dayton model 1nxd4 for a friend house,after the instalation was finish the unit will not turn on. after installing the unit i found out that the unit was...


Three Phrase is usually only avail at a commercial
business

You would need a complete additional service to the house just for the AC
They would have to install a new transformer on the pole

I would suggest replacing the motor if that is the only issue,
to single phase 240 volt

May 23, 2011 | Heating & Cooling

1 Answer

I am looking at a 480v fed chiller. It seems to be wired so they can also drive a 120v pump from the same 480v feed. Is this possible?


From what I found, 480 volt, 3-phase is 480 volts from leg to leg.
It is also 277 volts from each leg to neutral.
One can use a step down transformer to reduce the 480, 3-phase to 208 v, 3-phase and then each leg of the transformed voltage would be 120 volts to neutral. Try to locate the transformer in or near the chiller control cabinet.

Dec 23, 2010 | Mr Steam TRANSFORMER 1/4 KVA 480V/120V

1 Answer

When is the formule for transformer 1.5 kva to amperes


To convert KVA to AMPS:
Multiply KVA by 1000/voltage (KVA x 1000) / E

May 18, 2010 | Electrical Supplies

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