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## What is the secondary output of a 45 kVA transformer?

For a 45kVA transformer, the primary current would be 45,000VA÷(480×1.732)=54A. For the same transformer, the secondary current would be 45,000VA÷(208V×1.732)=125A.

## What size transformer do I need for A 200 amp service?

If you are a residential customer and have installed a 200 A panel that is 240/120 V single phase, the utility may decide to install a transformer that is much smaller. For example, the apparent power for a 200 A at 240/120 V single-phase service is 48 kVA. The utility will not typically install a 50 kVA transformer.

## How do you calculate the full load voltage of a transformer?

2. VS(full-load) = ES – ISR – ISX.
3. or VS(full-load) = ES – IS(R+jX)
4. ∴ VS(full-load) = ES – IS*Z.
5. Vdrop = IS(RcosΦ + XcosΦ)
6. if cosΦ = 0.85, Φ = cos-1(0.85) = 31.8o ∴ sinΦ = 0.527.
7. IS = VA/V = 10000/110 = 90.9 Amps.
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## How many amps does a 45 kVA transformer have?

45 kVA Single Phase Transformer Amps when V = 1.1 kV. Amps = 45 * 1000 / 1100 = 40.9 Amps. In case of Three-phase 45 kVA Transformer. Amps = 45 * 1000 / (1100 * 1.73) = 23.64 Amps. 45 kVA Transformer Complete Chart for different voltage levels

## How to calculate the voltage of a three phase transformer?

Three Phase Transformer Full-Load Current (Amps) = kVA × 1000 / (1.732 × V) Where: kVA = transformer rating (kilovolt-amperes), V = voltage (volts). Turns Ratio = N 1 / N 2 = V 1 / V 2 = I 2 / I 1. Where: N1 = number of turns on the primary, N2 = number of turns on the secondary,

## How to calculate the full load current of a transformer?

To calculate full load current, use this formula: Single Phase 600V Class To calculate KVA, use this formula: KVA VOLTAGE KVA VOLTAGE GENERAL PURPOSE DRIVE ISOLATION Amps = KVA ÷ Volts x 1000 KVA = Volts x Amps ÷ 1000 KVA VOLTAGE PO Box 6316 Fort Smith, AR 72906 Title amp_chart_600v.xls Author Steve Lockridge Created Date

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## How to calculate 3 phase kVA to amps?

3 phase kVA to amps calculation formula. Calculation with line to line voltage. The phase current I in amps (with balanced loads) is equal to 1000 times the apparent power S in kilovolt-amps, divided by the square root of 3 times the line to line RMS voltage V L-L in volts: I (A) = 1000 × S (kVA) / (√3 × V L-L(V) )