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Anonymous Poster #1

Unbalanced Current Standard

04/10/2013 9:27 PM

DEARS FRIENDS

COULD U HELP ME, LIMIT OF THE UNBALANCE CURRENT AND THE STANDART THAT REFERS FOR THE UNBALACE CURRENT?

THANK U
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jan63
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#1

Re: UNBALANCED CURRENT STANDART

04/10/2013 11:14 PM

should be less than 9 %
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PWSlack
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#3
In reply to #1

Re: UNBALANCED CURRENT STANDART

04/11/2013 3:11 AM

WALOOB

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Tornado
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#2

Re: UNBALANCED CURRENT STANDART

04/10/2013 11:18 PM

There may not be a universal standard for this; rather, it may vary with local or regional standards.

Please turn off all-caps, which are considered shouting.

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PWSlack
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#4

Re: UNBALANCED CURRENT STANDART

04/11/2013 3:12 AM

In the limit, the power on two of the phases is zero and the unbalance current is the same as the current in the third phase. That is what the neutral conductor does. <yawn>

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electricalexpert65
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#5

Re: UNBALANCED CURRENT STANDART

04/11/2013 3:31 AM

That depends on the type of load that is connected to the supply. Static equipment have a larger tolerance to unbalance currents whereas rotating equipment have a lesses tolerance. If you can be more specific, I can give the reference.
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Anonymous Poster #1
#6
In reply to #5

Re: UNBALANCED CURRENT STANDART

04/13/2013 7:52 AM

I would evaluate unbalance load at the design electrical system at my plant using etap. I want to know what the limited the unbalanced standart alert that should I input at: 1. Line voltage unbalance rate (LVUR) 2. Phase voltage unbalance 3. Negative squence Voltage unbalance rate (VUF) 4 zero sequence voltge unbalance factor ( VUF0) 5. Current unbalance ratio (IUR) 6. Negative squence branch current unbalance factor (IUF2) 7. Zero squence branch current unbalance factor What the standart value for each kind of unbalance above? Thank u
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Anonymous Poster (1); electricalexpert65 (1); jan63 (1); PWSlack (2); Tornado (1)

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