24-05-2020, 06:46 PM
Hi Folks, DC can also cause havoc to distribution transformers.
I was called in on a Sunday to a large manufacturing plant where I was chief engineer.
A 1MVA 11Kv to 440V transformer had blown up on night shift. This fed one of the spot welding shops where the setters believed it was better to set the machines for the max number of cycles at a low phase angle (they believed the few mS longer the weld took meant they did not have to work so hard!)
Ed
I was called in on a Sunday to a large manufacturing plant where I was chief engineer.
A 1MVA 11Kv to 440V transformer had blown up on night shift. This fed one of the spot welding shops where the setters believed it was better to set the machines for the max number of cycles at a low phase angle (they believed the few mS longer the weld took meant they did not have to work so hard!)
Ed
