Tripping Circuit Breaker on Wye to Delta Transition 2

[reelcoy]

I have a situation where a 200 amp Cutler Hammer HJD breaker is tripping when the 75 HP Air Compressor is being started and it transitions from Wye to Delta. The Breaker trips instantly when Delta contact closes. I am aware of the Wye Delta transition inrush. But this is an application where the Wye Delta starting arrangement has been successfully used many times with no problems. And this is happening to (2) Identical installations of the Air compressor and breakers, same location. The question is "What site conditions create this unusual excessive inrush? Or is it the breaker that is extra sensitive?

 

[itsmoked]

Got it wrsharper! S c r e w compressor. All the difference in the world.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com