Low Voltage 170 VAC Arc Calculation

[Gstan]

The IEEE 1584 caclulations are for 200 VAC and up for small arc gaps.

Has anybody seen information on whether or not an arc between a three phase 170 VAC supply will sustain on high current systems for gaps ranging from 3 inches to 12 inches? The available fault current is approx 200 kA.

I am also looking for information on arc energy between one phase of the AC supply above and the 90 VDC bus within the rectifier.

 

[dpc]

I'm not aware of any published test data at these conditions, but it seems very unlikely that an 170 V ac arc could be sustained at those gaps. It's pretty difficult to sustain an arc at 208V, although it can be done, but only at much smaller gaps.

There is a lot of additional testing being conducted. You might try contacting someone on the IEEE 1584 committee.

As for the ac to dc scenario - I have no idea. Is there really a current path?