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A transformer has a primary volt of 240v and a secondary volt of 48v what is the turn ratio?
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Can you feed a 208v 200amp panel from 480v 20amp circuit?
Not directly, you would need to transform 480v circuit to 120v with a transformer first.
How can a CT generate a lethal high voltage when not connected to burden resistance?
A CT is a current transformer. The key word is transformer. Any transformer has a turns ratio. Take a 480V to 120V transformer for instance. The ratio is 4:1, that is for every turn of wire on the secondary winding, there are four windings on the primary. So, if there are 200 turns on the secondary, there are 800 on the primary. We can reverse that same transformer to make it a step-up transformer. Now we would say it has a turns ratio of 1:4. Lets take that transformer and modify it (in our imagination) to see what will happen. Every time, we will apply 120V to the primary, and measure the output voltage on the 800 turn secondary. We will change the number of turns on the primary each time. First, the original ratio: 200T (turns) : 800T (turns) = 1:4 (ratio) = 120V (input) : 480V (output) OK, that seems pretty obvious. But now lets start removing turns from the primary. Watch the trend of secondary voltage: 100T : 800T = 1:8 = 120 : 960 50T : 800T = 1:16 = 120 : 1920 25T : 800T = 1:32 = 120 : 3840 5T : 800T = 1:160 = 120 : 19200 2T : 800T = 1: 400 = 120 : 48000 Wow, the output voltage for our transformer with a two-turn primary is a whopping 48000 volts! Is it possible to have a transformer with a one-turn primary? That is exactly what a current transformer is! the bus wire that passes through the CT forms a one-turn primary, and the many-turn CT coil forms the secondary. If the secondary is shorted, the secondary reflects the primary current divided by the number of secondary turns. But if the CT is open, the current ratio is now 1:zero (no load), the voltage ratio is the inverse - 1:infinity. So, if the CT is not shorted with a very low resistance, it tries to be a voltage transformer with an extremely high secondary voltage. In practice, the voltage is limited by coronal discharge and/or insulation breakdown of the windings. But it can produce some pretty good fireworks and smoke while it is happening! I once observed a facility electrician at one of my customers industrial plants accidentally cut through CT wiring while it was energized. He thought the conduit was abandoned and he was removing it. That CT wiring easily produced an impressive 2-inch continuous arc. This is why CT's are wired through special terminal blocks that short out the CT when the disconnect is pulled. You should never try to work CT wiring hot, and not under any circumstances if you are not trained and qualified!
What is the high leg in a three phase 480 panel?
there isnt a high leg in a three phase 480v panel only on 240v panels
How do you convert from 480 volt to 220 volt or 110 volt?
AC voltage conversions are usually done with transformers. Most commonly, a 3 phase 277/480v system is transformed to a 3 phase 120/208v system. You can, however transform to anything you like with the proper transformer. If you are trying to convert 480v single phase to 240v single phase, such as for home use, then ask for that type transformer. It would use only 2 phases of the 3 phase system. Using 2 phases is called single phase and there are reasons for this that are beyond the scope of this answer. 220v and 110v are field measurements of what is considered 240v and 120v when ordering equipment or applying code.
A transformer has a primary volt of 240v and a secondary volt of 48v what is the turn ratio?
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How do you wire 240V to 480V dry type transformer 15kw?
To wire a 15 kW dry type transformer for a 240V to 480V configuration, first ensure that the transformer is rated for this voltage conversion. Connect the primary side to the 240V supply by connecting each of the two primary terminals to the respective phases of the 240V supply. For the secondary side, connect the output terminals to the load requiring 480V, ensuring that the load is compatible with the transformer rating. Always follow local electrical codes and safety standards, and consider consulting a licensed electrician for installation.
A 240V to 480V Step up transformer with a load of 85 amps at 480v what amperage will the transformer draw if the primary is 240V?
Since this transformer has a ratio of 1:2 the load current on the 480V side just has to be doubled. 85 x 2 = 170A on the primary. 40.8 KVA transformer. To prove this just find the KVA of both sides and they should be equal.
What KVA transformer is needed to convert 480v - 240v 13.5A load?
Ohms law says that watts are equal to volts times amps. 240v X 13.5a = 3240 va VA / 1000 = Kva So, your load requires 3.24 Kva. The transformer should have a rating greater than this as a safety factor, so you would choose the next larger size, in this case probably a 5 Kva transformer with a 480v primary and a 240v secondary. Your local electrical codes may require a larger safety factor, so you would want to consult them before buying the transformer!
How do you convert 480v to 120v?
to derive 120 volts from 480 volts you have to use a transformer, based on your needs. If you needed 100 amps at 120 volt single phase you would need a 12kva transformer. This is just an example.
How do you get 480v circuit from 120v?
You can use a step-up transformer. Transformers are rated in primary voltage, secondary voltage, kVA, phases (single and three) and other parameters then equipped with indoor and outdoor enclosures. Be sure to consult a professional engineer or electrician when choosing and installing a step-up transformer. There are several NEC issues involved as well as choosing a transformer that is right for the type of load you have. One without the proper licensing AND knowledge of transformer circuits should never install 480V wiring or transformers.
What is the primary feed for a 480v to 208v 100amp panel 3phase?
The primary feed for a 480V to 208V, 100 amp panel in a three-phase system typically consists of three phases (L1, L2, L3) and a neutral wire, coming from a step-down transformer designed to convert the higher voltage to the lower voltage. The transformer will have a primary side connected to the 480V supply and a secondary side that outputs 208V. Additionally, proper grounding must be ensured for safety and compliance with electrical codes. The panel will distribute the 208V power to various circuits as needed.
How many wires do you need if you are stepping up single phase 120-240V to 480volts?
Five wires. Two on the primary side, connected to each 120V leg, giving a primary voltage of 240V. Two on the secondary side, one connected to neutral, and the other the new 480V hot. One connecting the frame of the transformer and the box containing it to ground. Note: you will only get one phase power out of this configuration - to get three phase output, you need three phase input, three transformers, and a lot more wires.
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.
If the output voltage from the transformer if primary coil 60 turns of wires and secondary coil 4 turns of wire is 32 v what is the input voltage?
Divide the amount of turns in the secondary into 32 V and you'll get 8. Now multiply 8 times 60 turns and you'll get 480V.
Can a 1500KVA transformer feed a 1600A 480V service?
No, a 1500KVA transformer is not large enough to handle a 1600A load at 480V. The transformer should have a higher kVA rating to support the current demand of 1600A. A transformer with a minimum capacity of 1920KVA would be needed for this application.
What size main breaker feeding 480v 75 kva transformer?
An exact breaker size can not be given because the voltage, and hence the calculation for current, is not given. A transformer shall be protected by an over current device that is not rated at more that 150% of the primary current.
