how can i change the supply frequency as 60HZ instead of 50HZ.?

Question

this is the electrical engineering related question. actually i am in singapore. in this region electrical power supply frequency is 50hz. but some of overseas ships those entered in singapore shipyards their supply frequency is 60hz. suppose i need 63A rating supply, how can i convert the supply frequency? what are the equipments needed?
kindly reply
thank you so much.

Answer 1

Hello,

According to my experience with consumer electronics, household appliances and electronic devices tolerate frequencies between 50..60 Hz just for the same reason you mentioned (because both frequencies are used). So every machine that hasn't got a strict funcionality dependence upon freq. (eg. fixed RPM rotary machine) or each that has a power supply to convert AC to DC, should be OK.
(every machine that states on the data table on it, is OK)

Bascially you can't convert the frequency of an AC voltage to another (mayber the even integer multiples could be, bur that's not the case). 63 Amps but at wich voltage? 110 or 230 Volts?
(by the way, 63 Amps is *huge* amount even at 110 V :( ).

Converting AC to DC via switcher supplies or transformers and back at a different freq via inverters may not work here, we're talking about tens of kWatts !!! It's expensive and such models may not be available. This is only a possibility say, below 2 kWatts.

A fairly cheap but unstable sulotion is to get an diesel generator and set/tune it to get a 60 Hz and set/adjust the output voltage. For 60 Amps @ 230V, a minimum of 25 kW is recommended (this depend on the overall impedance of the load (-> all consumers powered), have some safety gap and choose a more powerful is possible). These machines usually can be switched between 110/230 Volts and 50/60 Hz. The cost of these gadget s are starting from 5.000 USD excluding the fuel used, up to you if that's fits your budget. But I suppose with 63 Amps these are at least medium sized ships, right ?

Eg. You can get new ones from the manufacturer Kohler:
http://www.kohler.com/hub/powersystem.html
Maybe you could contact them and they will help choosing the right model for you


But there are used ones, too. Look for e-bay or enter it to Goolge.

Godd luck solving the problem!

Regards

Answer 2

You probably worry too much...
I have moved from country to country throughout my life (also 4 years Singapore - I miss it!), and I repeatedly had this "problem".
I found that most 50Hz appliances work well on 60HZ, and vice versa, EXCEPT: -
- where there is a clock built-in: It goes 20% wrong. I learned to live with it...
- where a so-called synchron motor is used, it sometimes hesitates to start, I changed the value of the starter capacitor.
- where an unregulated power supply is used for simple electronic control (like a oven/stove or cooking hood), 60Hz "produces" more secondary voltage than 50Hz (your case is the other way around).

Of course, if you use a 60Hz appliance on 50Hz you lose some of the "rms"-power, i.e. when it comes to heating. But then again,
using a frequency converter is not only very expensive, and you lose about 25% efficiency too, which is wasted in heat (exactly the thing you need in S'pore!).

Answer 3

I see your problem probably involves three phase power there are two solutions.
1. power inverter used for three phase motor to give +/- 80 Amps can be set to the frequency you want. Note this will only work supplying motors.
2. Rotary converter (the best solution) which consists of a synchronus motor driving a three phase alternator,through a 1.2 : 1 speed up gearbox . 50Hz to 60 Hz four pole motor and four pole alternator.
Using a Y connection alternator to give lighting and industrial power as needed by the normal ship - the output of the alternator needs to be 150% more than your normal load so you will have the Oomph to get you through power surges.

Answer 4

This Site Might Help You.

RE:
how can i change the supply frequency as 60HZ instead of 50HZ.?
this is the electrical engineering related question. actually i am in singapore. in this region electrical power supply frequency is 50hz. but some of overseas ships those entered in singapore shipyards their supply frequency is 60hz. suppose i need 63A rating supply, how can i convert the supply...

Answer 5

If you require 63A at say 240V or even 110V, there is no easy way to shift frequency from 50 Hz to 60 Hz.

One way to do it - not easy - is as follows:

Convert your available AC mains power to 12V DC. Then use an inverter which is correctly rated to the AC voltage, current, and frequency you want.

Answer 6

r supplies or transformers and back at a different freq via inverters may not work here, we're talking about tens of kWatts !!! It's expensive and such models may not be available. This is only a possibility say, below 2 kWatts.

A fairly cheap but unstable sulotion is to get an diesel

Answer 7

If I remember correctly,there is a machine called DYNAMOTOR. Which is actually motor and generator coupled together.If you apply 50 Hz power to the motor, generator will generate 60 Hz power.It is done by method of winding in them.

May be you can still find one.