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davidbeach, My perception is that Transformer primary Inrush gets reflected on the secondary side as well. Is this not correct ? V2 I1 - = - V1 I2 Thanks

dpc, My apologies for missing one more point, You mentioned a current limiting is used all the time. Actually, the first current limiting fuse I tried was GE 960-EJ01 50E, It helped reducing the energy on sec. bus but I wanted to make it does not trip on transformer in rush, which is 376 A...

dpc, After I posted this post, I have been simulating ETAP and your statement looks like a blessing to me. You mentioned "If you energize the transformer from the high side, the low side breaker sees no inrush" HOW COME ? because I had selected a Cutler Hammer ND style with 1200 A Frame...

Hi All, Before asking this question, I have read a number posts on ArcFlash. I think I have a solution but I guess your words might prove a little more reassuring. Case#1 : I have a 13.8KV/600V 750 KVA transformer, It is a Power Distribution centre with a S&C 15 KV SM-4, 50 E disconnect...

I am not sure, if modelling and connecting building foundatons will help in learning more about the Grid in question.

Hi.... There are a lot of people here on this forum out of US and Canada. I googled a course from ABB on Distriution protection in their Medium voltage products training division. It is happening in Pennsylvania this year. Any body who has ever done these course and how much one can learn to...

Thanks burntzx. What this isolator would basically do. I have been doing some research on my own and figured that basically common mode noise between VFD outputfilter and motor cable is tripping the ground fault relay. This common mode noise being reflected in terms of zero sequence...

This is the first time on my site here. I would appreciate, if any one could drop a word. Thanks

Hi All, I a new to this motor control with VFD but I know issues related to harmonics on 480 V or 600 V on low voltage systems but to some extent it can be addressed by using inline filters. This situation is on the secondary of a 13.8kv/600 V side of a undeground transformer which is...