Transformer Definition and 787 Threads

i can't seem to understand why with current transformer if the primary winding is reconnectable the rated output stays the same. but rated output depends on turn ratio if the secondary winding is reconnectable?? why??

I have a ferrite 12V to 36V transformer driving a purely inductive load near the maximum load capacity of the transformer. The inductance of the load is much less then the transformer secondary inductance. Twelve volts is placed across the primary for a period of time T1, and the...

How far can a step up transformer increase voltage ? Why voltage is stepped up. Is the end result output power suitable for home use after using step up transformer ?

Hello to you all, I have seen something at a friends work place and did not understand how it worked? after asking I didn’t get an answer that satisfied me. The company produce voltage detectors and test them on a single phase 50kV transformer. One output post is connected to Earth and the...

why transformer is a machine?

Hi all- Can anyone offer any insight into a problem I've noticed for years but don't know how to solve? I'm a self taught neon tube bender. I am not an electrician or electrical engineer. Through the years, I've noticed neon tube, fluorescent lamp, transformer and ballast failure more often...

I can't figure out how those 110/220v transformer work. Like the ones in cell phone chargers. Say for example, if the primary voltage is 110v, the secondary will be 24v. But if the primary is connected to 220v, the secondary should be 48v. Are the stages after the secondary designed for up to...

T/F=Transformer usually T/F is used according to the load of the area, street etc. How they estimate that 50 KVA transformer is enough for this load,street? any formula or method please explain ::Thanks

What is the procedure to recondition the mineral oil used in transformer so that it become useable again. Any helpful link or... Thanks

Homework Statement Using two solenoids on a ferromagnetic core, I made a primitive transformer and graphed this graph of voltage against frequency which is attached. Homework Equations [What I'm looking for.] The Attempt at a Solution What I am having trouble is, what equation...

Homework Statement This is a review question for my test, but I can't get the right answer, the problem is to find the impedance ab. Homework Equations Zin = 1/a^2 * ZL The Attempt at a Solution The 10 ohm resistor and the capacitor are in parallel and then add the 50 ohm resistor...

Hi all, Is there a definite relation between un-balanced loading of a 3 phase transformer and increase in transformer loss? If so, how? Does un-balanced loading affect variable (copper) loss or fixed (core) loss? Pls. explain in detail. If I carry out load balancing between the o/p phases...

I've been running some tests on some simple AC step up transformers, and I can't seem to justify something to myself: I hook up 12 VAC to the primary coil, but the voltage on the coil is actually more like 1 VAC, when measured with a voltmeter. It's not an issue with the supply--it puts out...

Hi Folks, We've been use one of the linear transformer in our product for a while and suddenly in one lot the transformer has failed the exciting current test limit at higher votage(132V). This is a 120AC/20VAC@750mA linear transformer. Supplier is trying to figure out what went wrong but...

1.If we increasing load on secondary of transformer core loss is same or not ? 2.what is the most common lamination thickness of transformer core? 3.some kind a paper we used in winding for insulation what is the name of this material?

The bulb connected to the input of a step-up transformer is less bright than a similar bulb connected to its output. Why?

Transformer HELP! A small transformer with 1200 turns In the primary coil is used to power a appliance that has a output voltage of 6V. The label o the transformer says that the input is 5W at 120V. What will be the output power of the transformer? Given: V output= 0.6*10V (6V)...

i have a vent that is too fast and too loud, and it runs off of US standard ac. i was wondering if there is a (good brand name) device that could limit the rms voltage. i don't want a pair of resistors, that would heat up real fast. i need the voltage cut in half, approximately. an analog...

The following transformer gets overheated and I was looking for most probable the causes associated with it. 1. Rating : 7.5 MVA, 0.85 power factor, Power Transformer (Manufacturer - Kirloskar) 2. Connected Load : Upto 6 MW 3. Oil Natural Cooling System 4. Normal Atmospheric Temperature ...

I want to know what do we use an isolating (1:1) transformer for. My book says it is to "protect against electric shock". It doesn't say how. I tried to ask my teacher but he didn't know. I also have looked at http://en.wikipedia.org/wiki/Isolation_transformer" , but I could not...

Hi, I would like to ask a question about Mutual Inductance and Transformer. Suppose I have two coils N1 and N2, where N1 is the primary coil and N2 is the secondary coil that is connected in series with some resistance Rx. If I place a voltage V1 across the primary coil, the output voltage V2...

I want to model a toroidal transformer with a given permeability and saturation flux density. Specifically, I want to model a split core toroid clipped onto a power line, to simulate coupling, so it is really a one turn secondary and a primary of arbitrary turns. Any software packages out...

i turn off the transformer i assembled its from a 220v power source i touched the primary windings and surprisingly it gave an electric shock. i never know this things store charges like capacitors, how does this happen? any explanations?

If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?

When the primary of a transformer is connected to A.C. mains, the current in it... a) is very small if the secondary circuit is open, but b) increases when the secondary circuit is closed. PLEASE EXPLAIN THESE FACTS.

I am using a digital genset controller that to run and protect a generator. This controller has, in addition to other functions, timed overcurrent protection (1-30 seconds). The controller uses 5 amp secondaries. The generator is 83 amp. The 100 amp breaker I plan to use has a...

I new here at the forums. I have a situation in an office building I'm handling. Just want to know if someone could help me out. Here's the problem: 3 units of 160 KVA SOCOMEC UPS connected to 3 units 200KVA 3 phase 4 wire 460V/380V transformer connected in parallel. Configuration is...

Hi, got a doubt this mng, when I heard the power will be shutdown in my office tomorrow to repair a faulty circuit b/w transformer and my office. when the transformer is shutdown, and generator/ups/battery is used to keep the power supply to critical components, will the current flow into...

Hello guys have a little problem see if anyone can help Homework Statement Q the primary winding resistance is 125Ohms, Secondary is 0.7ohms calulate the transformers copper loss at full load. now the transformers name plate is 240V 50Hz 28VA the earlier question explains...

I have two inductors, one as a primary and the other as the secondary. I am trying to transfer the radio signal from the primary inductor to the secondary inductor. But I am getting no signal on the secondary inductor. The radio signal is a voltage signal with very little current. The inductors...

what are load calculations for a transformer? A 44kv line is distributed into the industry using around 8 transformers 3750kva, 2500kva and 1500kva. What does this mean and what are the load calculations for this? Also how is it distributed?

If I have a transformer with a known primary inductance and number of turns, and the output is open circuited, how would I go about calculating the magnetomotive force created by the magnetizing current?

If one had a microwave oven transformer (MOT) from a microwave that was said to be 1200W, and the transformer itself had an output of 2300V, would that mean that the current would be: Power = Current * Voltage 1200W = Current * 2300V Current = 0.52A The reason I ask is because: I'm...

I'm looking over some equations for the output of a flyback transformer (essentially the same as for a buck-boost converter) and I notice that as long as the flyback operates in the continuous mode, the inductance doesn't enter into the equation. Of course since no inductor is ideal, there must...

What should be the maximum and minimum primary voltage of output transformer with 10 turns of 22 SWG primary winding and 500 turns of 34 SWG Secondary winding?

Homework Statement See attached for a view of the problem Variables a=transformation ratio= 1/5 Ip=2Amps ZL=2 ohm resistor Homework Equations Q1 : Find the current magnitude of the current IL and the Voltage VL Q2 : Find the input impedence. The Attempt at a Solution OK, my...

Another transformer question: if I have an oil-filled transformer coil and I calculate the turns ratio with voltage in / voltage out at 60 Hz, why, when I increase the frequency to 23 kHz would the turns ratio appear to change? Is it because of the inductance of the primary coil? My boss'...

Homework Statement What is the the efficiency of a transformer with 13w of primary power. 120Vp, Np unknow 12Vs, 90Np Homework Equations The Attempt at a Solution eff= Psec/ Pri * 100

I want to confirm that I'm thinking about this in the right way... Imagine a transformer. The primary has an integer number of turns. Now imagine the secondary has less than 1 turn, i.e., just a piece of wire passing through, forming essentially half a turn. I know voltage is induced in...

Like the title says, I am wondering if it is possible to rectify an AC signal and run it through an AC transformer. The rise and fall in voltage still exists so it should work, or are AC transformers made specifically for an AC signal and other information needs to be taken into account?

A few nights ago, the pole on the side of the road that holds our transformer snapped, the transformer exploded and set the pole on fire. In my plant we were running on 2 out of 3 phases for a while until we completely lost power. Now here's the "weird" thing... Just about every motor...

I need to replace an Audio transformer, EI-19 Output Transformer. What should I replace it with? I can't find the primary to secondary ratio, or the voltage ratings. Is there something special about audio transformers compared to step up/down transformers used in AC to DC converters? If so, what...

Hi, i am building an inverter 12VDC- 120VAC, 50 Hz with square wave as gate signal for MOSFET. Looks like my circuit works fine because i am getting square out -12 to 12 AC. Now i am using transformer to step up 12 VAC to 120 VAC. But i am experiencing some problems. But i am supplying...

When a transformer is rated 225 VA, Vprimary=120 V and Vsecondary=9KV, Isecondary=25 mA, does this mean that on the secondary side the transformer can only supply 25 mA, no more, no less than rated current. Thanks

I am a UG electrical engineering student. I studied about magnetic circuits and transformers recently in one of my departmental courses. I want to find out if I can implement this knowledge practically. So can anybody suggest some interesting projects on magnetic circuits or transformers...

I thought it would be a good idea to write this down, all in one place, finally. Any errors, or impovements needed? Should it be in gaussian units?

Hi Guys, :smile: I am grappling with a peculier (but somewhat common) problem with Current Transformer (CT) magnetic circuit. I will be very grateful if someone could help me out with my problem. 1)In an ideal Voltage Transformer (VT), the magnetic flux developed in the core remains...

Homework Statement What would be the output of a transformer plugged into a DC voltage source by mistake? Homework Equations N/A The Attempt at a Solution Judging from the phrasing of the question, I am assuming that a transformer should not be plugged into a DC voltage source...

It is understood that you cannot have something from nothing, but how is this the case with a step up transformer? It seems that stepping up the voltage is stepping up the potential energy and since more windings actually increase the resistance there will be lower current which is how most...

Hi, I'm an apprentice multiskilled engineer, thought I prefer electrical engineering anywho, my power shower at home stopped working and upon testing there was no ouput from the transformer, 230v/24v DC and it got me thinking, I'm aware of the step up/down voltage theory etc and the windings...