Volt drop calc

[Isaiah]

Trying to check voltage drop from temperature relay sudden pressure relay and liquid level relay on a liquid filled power transformer to a GE Multilin 469, (i.e. and 26, 63 and 71 functions).
The Mulitlin is around 1500 feet away from the transformer in a MV switchgear. I’m thinking this is just a straight 2-wire calculation at rated voltage eg 120VAC. Not sure about the amps but probably very low.
Has anyone done this before?

 

[ptonsparky]

Trying to check voltage drop from temperature relay sudden pressure relay and liquid level relay on a liquid filled power transformer to a GE Multilin 469, (i.e. and 26, 63 and 71 functions).
The Mulitlin is around 1500 feet away from the transformer in a MV switchgear. I’m thinking this is just a straight 2-wire calculation at rated voltage eg 120VAC. Not sure about the amps but probably very low.
Has anyone done this before?

I don't know why any of the misc information is needed. Operating voltage of the circuit, amperage, distance and wire size should be all you need for VD. How VD works in with your functions would be something else.

No, I have not worked with your specific installation.

 

[augie47]

The literature I see on the 469 does not give the current draw but you would imagine it's fairly low..
You can play with the numbers. At 1 amp, 1500 ft, 3%, a #10 would be sufficient.

 

[Isaiah]

The literature I see on the 469 does not give the current draw but you would imagine it's fairly low..
You can play with the numbers. At 1 amp, 1500 ft, 3%, a #10 would be sufficient.

Yep. That’s exactly what I used for an approximate value, i.e. 1A.
And yes I also come up with #10Awg. Thanks


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