What is the voltage of a 75 kilovolt transformer?
How many amps does an ideal transformer draw?
What is 75 kVA?
How much efficiency does a transformer have?
How many volts for a 3 phase 10kVA load?
How does a transformer work?
What is the apparent power of kVA?
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What is the ampere rating of a 75 kVA 480 V three phase transformer?
This transformer is rated 75,000 volt-amperes (75 kVA × 1,000 = 75,000). The primary side current will be 90A (75,000 ÷ 480 ÷ 1.732 = 90.2 = 90).
What size breaker do I need for a 75 kVA transformer?
Senior Member. I know the typical industry installation is to size the primary OCPD of a 75 KVA transformer at 125 amps and the Secondary at 300 amps.
How many amps is a 750 kVA transformer good for?
The bigger the KVA size, the bigger the loads transformers can accommodate. Mathematically speaking, a 750KVA can supply a three-phase load of 208V with 2082 Amps, or it could supply 3 single-phase circuits of 120V at 2080 Amps each.
How many volts is a 75 kVA transformer?
600V75 kVA Transformer - 600V Primary Voltage - 120/240V Secondary Voltage - NEMA 3R.
What size transformer do I need for 200 amp service?
if the service was fully carrying 200amp it would take a 50 KVA transformer (50 / . 24 = 208.33A).
How do you calculate the breaker rating of a transformer?
Transformer Primary Current (Ip)= P/1.732xVp....For Primary Side:Transformer Primary Current (Ip) =52.49Amp and impedance is 5%As per above table in not supervised condition Size of Circuit Breaker= 600% of Primary Current.Size of Circuit Breaker = 52.49 x 600% =315Amp.More items...•
How do I convert kVA to amps?
In many cases, it's useful to convert kVA to amps. S stands for apparent power; the very thing that is measured is Volt-Amperes (VA)....kVA To Amps Calculator (With Table)kVA (Apparent Power)Voltage (220 V)Amperage (A)How many amps is 1 kVA?220 V4.55 AmpsHow many amps is 5 kVA?220 V22.73 Amps7 more rows
What size transformer do I need for a 225 amp panel?
Moderator. If your supplying a 225 amp 208Y/120 panel from a 480 feeder the typical transformer size is 75 kVA.
How many kVA is 30 amps?
11.43 kVAAn electrical system drawing 30 amps at 220 V results in 11.43 kVA of apparent power.
How big is a 75 kva transformer?
SpecificationsHeight37 in (939.80 mm)Width30 in (762.00 mm)Depth20 in (508.00 mm)Net Weight410.00 lb(US) (185.973 kg)
How many amps is a 300 kva transformer good for?
1,000 AmpsThe 300 KVA transformer itself can handle up to 300,000 volts and 1,000 Amps.
What is the cost of 100 kva transformer?
market price of Transformer 100kva in India is Rs 50,000/ Piece.
What size breaker do I need for a 112.5 kVA transformer?
For a 112.5kVA transformer, 312A × 1.25 = 390A, so use a 400A protection device.
What size breaker do I need for a 150kVA transformer?
Secondary FLA on 1 150kVA transformer is 416A and if you apply the 125% factor for 450.3(A) you get 520A and therefore being questioned as to weather or not 400A breaker is adequate.
What size breaker do I need for a 45 kVA transformer?
For a 45 KVA transformer the size of the primary side overcurrent device is permitted to be 70 amperes.
How many amps can a 100 kVA transformer handle?
Another example is how many amps does a 100 kVA generator produce? A 100 kVA generator produces 833.33 amps at 120V voltage. With this, you have all you need to convert kVA to amperes.
75 KVA transformer | Mike Holt's Forum
Personally I tend to size the primary protection above the 125% figure to assure it will not trip on inrush, which is greater with the new energy saving transformers. I don't go any less than 150A on the primary for a 75 KVA transformer, but I often put a 225A on the primary and use 300A on the secondary.
Transformer kVA to Amps Rating Calculator with Calculations and ...
The transformer kVA rating can be used to calculate amps. List of Contents1 Transformer kVA to Amps Calculator2 Transformer Amps from kVA rating Formulas3 Examples for Transformer Amps calculations3.1 225 kVA, 3.3 kV Transformer amps4 500 kVA, 3.3 kV Transformer Amps4.1 500 kVA Transformer Chart for Different Voltage Levels5 1000 kVA Transformer Amps5.1 1000 kVA …
Transformer Calculator KVA Calculator Full Load Amps Calculator
FORMULAS USED IN CALCULATOR: 1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 1000
What size breaker I need to feed a 75 kva transformer? 1… - JustAnswer
What size breaker I need to feed a 75 kva transformer? 1 day. I have a 200 amp disconnect in 480 volts the distance in - Answered by a verified Electrician
What size wire should you use to feed a 75 KVA transformer 480 3 phase ...
I=kw*1000/E*1.732 primary side 90.3 amp. Secondary side 208 amp. 100 amp 277-480 breaker good for primary side usually i install 200 amp 208-110 secondary side. Primary wire size #2 secondary side 3/0
What size wire do I need to feed a 75 kVA transformer? - Quora
Answer (1 of 8): Input cables and Output cables may be different a 75-kilovolt-ampere (kVA), three-phase transformer with an input voltage of 480V will be installed in a small industrial plant. This transformer is rated 75,000 VA (75 kVA × 1,000 = 75,000). The primary side current will be 90 amp...
How to find amperage of a three phase transformer?
For example, a three-phase transformer of 45kVA, has a voltage in low tension of 208Voltios (LL), to obtain the amperage it must multiply 45kVA x1000 and then divide the result between the AC voltage by √3 (square root of 3), being of the following way: (45kVAx1000) / (208Voltx√3) = 124.91Amp).
How to convert kVA to amp?
How to convert from kVA to Ampere in only 1 step: Step 1: You must multiply the kVA by 1000 and divide the result between the voltage shown by the formula according to the system you have, monofasic, biphasic or three-phase.
Single phase kVA to amps calculation formula
The current I in amps is equal to 1000 times the apparent power S in kilovolt-amps, divided by the voltage V in volts:
3 phase kVA to amps calculation formula
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:
What is the voltage of a 75 kilovolt transformer?
a 75-kilovolt-ampere (kVA), three-phase transformer with an input voltage of 480V will be installed in a small industrial plant. This transformer is rated 75,000 VA (75 kVA × 1,000 = 75,000). The primary side current will be 90 amperes (A) (75,000 ÷ 480 ÷ 1.732 = 90.2 = 90). This transformer will be sized for continuous loads; therefore, the conductors must have an ampacity of at least 113A (90 × 125% = 112.5 = 113). In accordance with Table 310.15 (B) (16), 2 AWG copper conductors have an allowable ampacity of 115A. Therefore, 2 AWG copper conductors will be installed to supply the transformer. The primary side overcurrent protection device will have a rating of 125A, which is the next higher standard overcurrent device rating above 115A. Because of the roundup rule in 240.4 (B), an overcurrent device with a rating of 125A shall be permitted to protect a conductor with an ampacity of 115A.
How many amps does an ideal transformer draw?
An ideal transformer draws zero amps on its primary, if there is no load on its secondary
What is 75 kVA?
75 kVA means only that the transformer is capable of coupling that much power from its input side to its output windings, for a long time, and up to some maximum ambient temperature, without getting so hot it is damaged.
How much efficiency does a transformer have?
These range of transformers have efficiency around 92–95% at Full load. Based on it the Losses in the Transformer (at Full Load) may be around 500watts !
How many volts for a 3 phase 10kVA load?
So for a 3 phase 10kVA load in a 230 Volt system (400V line to line actually 398 according to the exact maths)
How does a transformer work?
Transformer is a static device which transfers electrical power from one AC circuit to the other AC circuit by means of increasing or decreasing voltage (or current) & by keeping frequency constant. Now, there are mainly 3 types of powers in case of AC circuit. 1. Active Power, P=VI*cos (phi) watt.
What is the apparent power of kVA?
The apparent power S in kilovolt-amps (kVA) is equal to the real power P in kilowatts (kW), divided by the power factor PF:
