Center Tapped Delta Transformer
Center Tapped Delta Transformer
(OP)
I recently updated a surge protection circuit to include line to ground protection. Would equipment that is connected to a center tapped delta configuration cause this type of surge suppression to be stressed? The reason being is that now, the MOVs are failing where as before, when only utilizing the line to line protection, the equipment ran fine. Also when two MOVs are connected in series, will the energy absorption be doubled?





RE: Center Tapped Delta Transformer
4W∆ [240/120?] is not a symmetrical configuration. Is the surge device clearly intended for the application?
RE: Center Tapped Delta Transformer
RE: Center Tapped Delta Transformer
Don
RE: Center Tapped Delta Transformer
Failure may be from the [acceptable-with-limitations but sometimes misunderstood] normally unequal line-to-ground/"neutral" voltages, applied to a device intended for symmetrical ø-ground systems. For plain-vanilla 4W∆, Bø-grd voltage is typically 1.73x Aø-grd or Cø-grd. At this point, careful review of installation instructions, nominal circuit voltages, device ratings and requisite overcurrent protection may be in order.
For series-connected MOVs, there could be damage from unequal per-device voltage division, whether under static or dynamic conditions. There are several PDFs on MOV application for AC circuits listed at http://www.littelfuse.com/ASP/Search/Detail.asp?ID=380
RE: Center Tapped Delta Transformer
A characteristic failure mode of misapplied MOVs produces significant and undesirable quantities of flame, smoke and radiated heat.
RE: Center Tapped Delta Transformer
I recently updated a surge protection circuit to include line to ground protection. Would equipment that is connected to a center tapped delta configuration cause this type of surge suppression to be stressed?
///Yes, it would, e.g. during switching.\\\
The reason being is that now, the MOVs are failing where as before,
///The MOV may need higher ratings, e.g. energy dissipation rating.\\\
when only utilizing the line to line protection, the equipment ran fine. Also when two MOVs are connected in series, will the energy absorption be doubled?
///It might, depending on the voltage rating of MOVs and surge wave. However, the paralleling of MOVs should double energy absorption.\\\
RE: Center Tapped Delta Transformer
RE: Center Tapped Delta Transformer
RE: Center Tapped Delta Transformer