How to Convert 60Hz 480v Input to 400v 50Hz Output?

With electronic circuits, but it could be done with a motor and alternator.

ignator

If this is your project, and you don't have a clue how to do this, you should find another field of study.

I mentioned na I need it in detail....how it works

Your not providing enough design requirements.

What is the output frequency waveform? e.g. sine, square, triangle

What is the tolerance of the output frequency?

What is the tolerance of the output voltage?

What is the total harmonic distortion allowed for the output frequency?

How much power is required for the 400v 50Hz output?

What efficiency is required minimum of the conversion of input to output?

What is the waveform type of the input frequency?

What is the tolerance of the input voltage?

Is lightning protection needed for the input circuits?

What is the tolerance of the input frequency?

There are many more questions once you answer these before a solution can be made up.

ignator

The electronic method requires converting your 60Hz to DC, changing the DC to the relevant value with a DC-DC converter, etc., and then creating 50Hz AC with a bipolar PWM circuit, similar to what you'll find in an U.P.S. Fairly complicated, especially if much power is required, e.g., over 1kW

Use a VFD. There is plenty of on-line information about how they work.

You have some options:

1. Electronic= using inverter with PWM (you can buy it)

2. Mechanic = using MG set with step down transformer

Dear Mr.reddy572141,

Conversion of AC 480 V, 60 Hz to DC, and AGAIN DC TO AC OF 400V 50 Hz is the most economical choice. Alternatively AC Motor Driving DC Generator and convert to AC power is other choice - but costlier.

I read during 3rd year Engineering Classes that in olden days, (may be about 5 decades back) 480 V, 60 Hz Supply to drive a DC Generator and tap AC Voltage - from the ROTOR, of the DC Generator, of course speed of the Generator will suit the required frequency of AC output. Perhaps on theory it seems to be OK but I did not get any working data in this system.

DHAYANANDHAN.S

Actually the lab experiment was to use the 60Hz supply to power a universal motor, vary its speed by controlling its field current to get 1500 or 3000 rpm, then drive the shaft of a synchronous generator for 50Hz output and setting the desired terminal voltage using field control. The experiment worked fine until the output load was varied and we soon discovered that universal motors have very poor speed/torque regulation.

For the OP's needs the VFD is a good idea, but a cheaper solution might be to use the 60Hz converted to DC, filtered, and applied directly or through batteries to a 50Hz inverter/UPS. Cheap and readily available.

Do it for European bound equipment every month or so.

We have a good transformer bank to get to 400V from the 480V (see Acme's site - they have a nice setup you can build using two small KVA transformers to get some rather good sized three phase KVA out - I believe we got 20KVA for well under $1000) . If we are running VFD's and universal voltage power supplies we stop here and use the 60 Hz, as it really doesn't affect these. When running motors directly, to get to the 50 Hz, a good VFD solves that problem. We just happened to have a spare 30HP rated VFD so we didn't have to spend that money for the test circuit. Just set it to 50 Hz maximum frequency output. The same pair of transformers can also be wired to get 600VAc for Canadian testing. Circuits are so similar we can change in about 10 minutes. Fortunately this is 60Hz as the VFD would not like that voltage, and to insert ahead of the transformer bank, in our situation, would not be that easy.

Note - the Acme circuit is for 480V to 380V, but the actual output is very close to 400V.

as usual......you didn't state what you're trying to do but it sounds like a homework question. you have some good answers already. break your problem into two parts. I'd transform the voltage 1st then go for the frequency.