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How do you define the amperage on a single phase 75kva transformer?
Wiki User
∙ 10y ago
please show me how to figure it out.
Wiki User
∙ 10y ago
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Recently seen 4 Transformers on single pole. 3 75kva and 1 50kva. Code violation?
Probably two different service voltages. The 3 75kva sounds like a 3 phase system and the 50kva a single phase system. The single phase transformer 50 kva should have 3 bushings going to the building, a bare neutral and two insulated wires wrapped around the neutral (triplex). The power distributors work under a different set of code rules. Since they are available 24/7 they say that is anything goes wrong with their system they will fix it right away. This gives them leeway to use some unorthodox installations.
How many horsepower are there in 75kva?
It depends on the power factor. For a typical power factor of 0.92, 75kva would be equal to 69kw, which would be equal to 9.25 horsepower (electric motor).
How many output amps from a 75kva transformer fed with 480 ckt.?
It depends on what the output voltage is. You only specified the input voltage, not the output voltage. The equation is 75 Kva = {some} amps times {some} kilovolts. (Minus incidental losses, of course, but you still need to know output volts.)
What size overcurrent protection device is required to protect the secondary of a three phase 75kva and 208 v transformer supplying a 150 amp continuous load?
If you're asking about load sizing, I think you already have the answer (at least 150A, although you could go up to 208 for full load, and maybe higher if you can overload the transformer). If you're talking about short circuit rating, you have entirely the wrong information. Short circuit rating will tell you if the fuse (if you're using fusing) mounting is rated to interrupt the available fault current.
How do you calculated kVA for 75kW motor?
It depends on the power factor. If the PF = 1, then you need 75kVA. In general, kVA needed = 75kW/PF.
What is impedance voltage in a transformer?
Power transformers have an impedance (Z) rating that is listed in %. So the nameplate might state 5% Z for example. What this means is that when the secondary conductors are bolted together then 5% of the rated primary voltage is applied and will generate 100% current in flow in the secondary. Example: you have a 75KVA Delta-Wye 5% Z transformer with a 480V primary rating and 208/12 secondary rating. The amp rating of the secondary is 208A [75,000/(1.732x208)] So if you applied 24VAC to the primary with the secondary bolted together with busbar then you would have 208A of current flow.
How many output amps is a 75 kva transformer?
For single phase, KVA = (line to ground) * (phase current). A 75kVA 480 to 208Y/120 volt transformer is a fairly common transformer. I assume this is the type of transformer you are referring to. 75k / 120 = 625 Amps. As an FYI, the 208Y voltage is the line to line voltage, which is equal to (phase 1) - (phase 2), where the phases are separated by 120 degrees, thus (phase 1) * 1.732 For three phase, kVA = (line to line voltage) * (phase current) *(sqrt 3), 75k / 208 / 1.732 = 208 Amps.
How many output amps is a 75 kva 208v-480v?
1kw=1.25kvaby this relation 75kva=60kwp=1.732*380*I*1I=60000/1.732*380*1I=91AmpsCommentPower factor is irrelevant to this question. You don't need to convert the kV.A rating to kilowatts, simply divide 75 000 V.A by (1.732 x 380). The answer is 114 A.This, of course, assumes that the question refers to a three-phase generator and that 380 V is the line voltage.
