PERCENT VOLTAGE DROP ON TRANSMISSION LINE
PERCENT VOLTAGE DROP ON TRANSMISSION LINE
(OP)
I was recently asked and performed a percent voltage drop calculation for a transmission line.
I have never done this calculation before so prior to submitting my work to the customer, I wanted to see if my answer was acceptable.
The only problem is I can't find any literature that lists what would be deemed acceptable results...5%, 10%, etc.
Does anyone know the parameters for acceptable percent voltage drop on a transmission line?
Thanks
I have never done this calculation before so prior to submitting my work to the customer, I wanted to see if my answer was acceptable.
The only problem is I can't find any literature that lists what would be deemed acceptable results...5%, 10%, etc.
Does anyone know the parameters for acceptable percent voltage drop on a transmission line?
Thanks






RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
This is a bid project and the customer is simply proposing several combinations of Transmission Line Sizes and MW on the line.
And from that, I was calculating the Voltage Drop.
My answer came out to be 10%, which seems high to me, but on the next combination, i got around 6%.
So I don't know if 10% is high and should be discarded as a choice or if that's typical.
There aren't any sites, manuals, etc. i have been able to find that say point blank: the acceptable voltage drop along a transmission line should be between 1%-7%, or whatever it turns out to be.
My only example would be the NEC where it calls out appropriate voltage drops in cables carrying power to equipment. I believe its somewhere between 3%-5%.
Is a number cited in this manner for transmission lines?
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
The NEC requirement is for unregulated utilization circuits and has no application to transmission lines.
Bill
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"Why not the best?"
Jimmy Carter
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
If this is a long line the capactance should provide some support for the voltage, and reduce the voltage loss. But at 10% the line should be very long, and the wire very small. I would expect the cost of larger wire to be small to the cost of the rest of the line.
Is this a composit core conductor by chance?
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
It took a couple of your threads but it suddenly clicked for me as to why the voltage regulation at the end is important.
You can't lose more voltage along the line than your LTC can bring back up. So if your LTC has 5% voltage regulation, your voltage drop needs to be less than 5%.
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE
If this is truly transmission, I would have expected a load flow study with absolute limits on the voltage rather than an allowable voltage drop for just your section of line.
The LTC also compensates for voltage drop in the transformer, so you may need more than a 5% LTC for a line drop of 5%.
RE: PERCENT VOLTAGE DROP ON TRANSMISSION LINE