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Participant

Join Date: Sep 2011
Posts: 1

Distribution System

09/07/2011 6:53 AM

Hello

I have to design a 400 volt line, to be fed from a thermal power house, Nuclear power house, and a solar system. For emergency there is a UPS system available. For peak load hours the tariff implication forces to shift to renewable energy and during off-peak load nuclear power supply is most favorite. But during peak load solar system do not support the air conditioning unit and UPS can only run the emergencies. In smart metering the utility presses to shut off extra load or face penalties. What is the most economical solution which can automatically change the load without interruptions from source.

SHERRY

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Guru
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#1

Re: Distribution System

09/07/2011 7:23 AM

Hi SHERRY, could I suggest you do your own homework. You learn more that way.

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Power-User

Join Date: Apr 2011
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#2

Re: Distribution System

09/07/2011 10:31 AM

an imaginary system has an imaginary solution.

In real systems, there are economic dispatch algorithms, along with operational constraints to handle the solution.

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Guru

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#3
In reply to #2

Re: Distribution System

09/07/2011 1:55 PM

We not only have bubbles...we have bubbles with kittens in them

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Guru
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#4

Re: Distribution System

09/07/2011 3:10 PM

This doesn't sound like homework to me. But I'm a little confused. We have smart power meters that interrupts only the air conditioning using a program the utility calls load sharing. And if the solar system can not support it, then the method of signaling the air conditioning control circuit must also include some signal that normal power is present.

Is this the condition you described?

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Power-User

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#9
In reply to #4

Re: Distribution System

09/08/2011 9:53 PM

one of the troubles with the world is that we overburden our loads with intelligence and outsmart our needs with too much smartness . . .

have we forgotten simple relay logic for small cycling and sequencing? which can even be written into a ladder on any small programmable controller?

the second big problem with the world is that we do not trust our own technologies and keep building redundancies instead of working on reliability . . .

the third big problem with the world is that nobody listens to good advice anymore . . .

the fourth big problem with the world is that we imagine too many hypothetical problems to avoid the real problems . . .

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#5

Re: Distribution System

09/07/2011 6:22 PM

To start with, your power sources are wired backwards, The Nuclear power should be available during peak demands and use Solar during off peak demands.Then use your UPS to run the back-up systems for the Nuclear Plant during an Earth Quake and subsequent ∞Tsunami flood.

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#6

Re: Distribution System

09/07/2011 11:27 PM

This is a homework in phantasyland. Only there is thermal and nuclear separate source available, with solar and traditional gen backup. Various and sundry battery sets were underemphasized, but they had to be there for completeness.

This is the never-never land of academia. Forget the question as posed, technically. If you really need it, do a tariff tradeoff calculation. Technically it is insane.

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Power-User

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#7

Re: Distribution System

09/07/2011 11:38 PM

i had a similar query once from a market research bureau working on a project for a meter manufacturer . . .

i had asked them whether a standby ups is also required in case the main ups fails?

they did not come back . . .

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Guru

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#8
In reply to #7

Re: Distribution System

09/08/2011 2:29 PM

Believe it or not that is what some "Professional Engineers" recommended for my facility.

We already have two UPS' connected by a static switch to the main bus. We have a third which feeds another portion of the facility's load. When we asked why he put the extra external static switch into place (for two of the UPS') and didn't use the internal static for each UPS he said he really didn't understand the purpose of it (!?!).

We recently had a meeting to discuss replacement of our UPS system(s) and his young protegé PE got pretty hot under the collar and emphasized the need to have two UPS', one to back the other up. (These are 350kW UPS' with 80 cells apiece, not too cheap!) They then went on to explain that we didn't understand our own mission very well and the need for extended backup in the event the gennies didn't start and/or main power was not restored.

I made a slight comment on how they didn't have much faith in their own genset or main power...that didn't help much.

We're only getting one to replace all three at this time. I will get my way!!!

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