An underground distribution department of an electrical utility is blamed for causing 'pin holes' in copper water lines. A housing district has had 7 complaints from plumbers that the electric utility's bonding to the water line has caused these pin holes. Has anyone had an experience like...
We are looking to add a new power transformer to municipal electric system. Currently, they have two (2) delta-to-delta transformers (with load tap changers), each with it's respective zig-zag grounding transformers to provide the ground on the wye distribution system. Upon talking with some...
What is or is there an importance to coordinate a high side fuse with the transformer inrush curve in a distribution substation (ex: 69-12.5 kv)? It is understood that the inrush current on a power transformer can be 8-12 times the magnitude of the load current for about .01-.1 seconds. Why...
I have started working for a client that currently has two (2) 67 delta to 14.4 delta power transformers in their respective substations. A zig-zag transformer is connected to the low-side bus to provide the "neutral/ground" for the wye distribution system. The previously mentioned...
