# How to split a voltage source into two

by Mniazi
Tags: source, split, voltage
 P: 40 Suppose I have a 10kW input. I want to divide the 10kW into two separate sources, like 1kW and 9kW. What can I do to separate the input into these different ratings?
 P: 532 What will you use it for?
 Sci Advisor PF Gold P: 2,725 Hi Mniazi firstly you need to understand the small error in your subject your thread title was OK How to split a voltage source into two" but your diagram doesn't support that you don't have Wattage sources. You have a voltage source capable of a given amount of current You then have 2 loads, one that requires up to 9kW (output1) and another of up to 1kW ( output2) So my questions to you now is... WHAT is your voltage source and how many Amps can it supply ? can it supply a total of 10kW ? examples may be .... 10kV @ 1A; 1kV @ 10A; 500V @ 20A see where this is going ? all of those sources can supply loads totally 10kW Dave
 Sci Advisor PF Gold P: 2,725 How to split a voltage source into two OK whilst awaiting your response ..... lets assume your 2 loads require the same voltage, for example lets say 500V that means load 1 will draw 18A for a full 9kW output and load 2 will require 2A for a full 1kW output Having the same voltage requirement means they can be fed off the same BUSS rail and you main concern is that the cabling supplying 18 Amps @ 500V to the 9kW load is capable of doing that and of course likewise for the 1A @ 500V cabling Dave
 P: 40 Ok right now im going to school, ill come back and redefine my diagram to make everything clear! :)
 P: 40 Ok so I have a 500 volt and 20Amp source, So if I put say an object requiring 18A and 9kV and another object requiring 2A and 1kW so can I put those two objects on the same output wire which takes 10kW without overloading either objects?
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P: 5,477
 Quote by Mniazi Ok so I have a 500 volt and 20Amp source, So if I put say an object requiring 18A and 9kV and another object requiring 2A and 1kW so can I put those two objects on the same output wire which takes 10kW without overloading either objects?
Probably, possibly, maybe. I'm hesitant. Your source is 500V, so whatever you connect to it must also be rated for that voltage. Are they? Your figures suggest so, but maybe they are only approximations/estimates? Is this DC or AC you are talking about?

I would encourage you to get the assistance of a properly qualified professional. 500V is not a safe area for you or anyone to experiment with electricity.

Incidently, too, it is unusual to hear an electrical device referred to as "an object". Just saying.
 P: 40 Sorry, im new here, im assuming it can be any voltage rating, just tell how can I split voltages into two different sources of different rating. Is that possible?
 P: 40 Its DC voltage
 P: 40 I am just asking a theoretical question :P
 Sci Advisor Thanks PF Gold P: 12,256 Hang on a minute. Your posts are not quite consistent and your quantities are muddled. Do you want to add two sources of Voltage, to get a higher voltage or do you want to add the outputs of two power supplies and feed a load that works on the voltage of each power supply? Tell us the precise requirement and you may (or may not) get a feasible solution to the problem. Without an awful lot of trouble, it is often not feasible to mix sources or loads which operate at different voltages.
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P: 5,477
 Quote by Mniazi Suppose I have a 10kW input. I want to divide the 10kW into two separate sources, like 1kW and 9kW. What can I do to separate the input into these different ratings?
Let's pretend you have a 10kW-rated diesel generator, supplying 500V. You wish to operate a few house lights totalling less than 1kW (rated at 500V, of course, so the bulbs don't explode), and you also want to power your custom-built 9kW air-conditioning plant (rated to operate at 500V, too). Does this resemble what you have in mind? Theoretically.
PF Gold
P: 3,745
 Quote by Mniazi Suppose I have a 10kW input. I want to divide the 10kW into two separate sources, like 1kW and 9kW. What can I do to separate the input into these different ratings?
A question well stated is half answered.

I cannot tell what kind of apparatus you have in mind or what you want to do with it.

I would guess from the way this one's stated that perhaps you have a 10Kw steam boiler and two small steam engines.
If that's so, just connect two pipes , one 3X the diameter of the other. Larger one goes to the 9kw steam engine and smaller to the 1kw steam engine.
If this is homework, can you answer why the 3X ratio of diameters?

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Does this demonstrate the importance of investing a few minutes to clearly formulate your question ?

This is not a personal attack. Just pointing out it's a two way street - if you want help, pitch and do some of the work. Here in US we call that "Priming the pump" .
From "Global Guidelines " under Site Info at top of every page:
 General Contents Guidelines: Please clearly state what you wish to discuss. In general, one should attempt to flesh out questions and arguments adequately enough that readers will have a good understanding of the issue.

 Ok so I have a 500 volt and 20Amp source, So if I put say an object requiring 18A and 9kV and another object requiring 2A and 1kW so can I put those two objects on the same output wire which takes 10kW without overloading either objects?
Well, 18A at 9KV is 162KW. That's a lot more than 10KW.
So this question is also not clearly stated .
Slow down and think before you type. It'd be a good idea for you to write your questions out longhand before going to the keyboard.

old jim
P: 22
 Quote by Mniazi Ok so I have a 500 volt and 20Amp source, So if I put say an object requiring 18A and 9kV and another object requiring 2A and 1kW so can I put those two objects on the same output wire which takes 10kW without overloading either objects?

I'm going to assume you meant 9kW instead of 9kV here.

Are you asking if you should use something like a circuit breaker or fuse (overcurrent protection)? Here's what I would do if this was a factory power supply and not some independent generator:

A 10kW supply to me means it can provide up to 10kW of power. So you can run your 1kW device off of this supply on it's own and the supply will just provide that 1kW of power. Same deal with the 9kW device. If I wanted to run both, and they were at the same voltage, I would do what davenn suggested: Attach both devices to the main power supply bus rail with properly rated wires running to each device. I would also place a circuit breaker at the main power supply for each device. It would look something like this:

This assumes that the supply also has some type of overcurrent protection, probably ~ 20 Amps. I would also get help from an electrician or electrical engineer in person and not get anywhere near 500 Volts.
 Sci Advisor PF Gold P: 2,725 Nice post kavik good info, and to the OP, particular reference to your last suggestion to him ..... I would also get help from an electrician or electrical engineer in person and not get anywhere near 500 Volts. cheers Dave