Our city is building 4 soccer fields and putting four poles per field with 11-1500 watt lights per pole at 480 volts. The fields are shaped in a rectangular fashion with a pavillion in the middle of all fields where the transformer and controls will be located as well as a consession stand. In...
Does it matter which bushing you tie to the hot phase on a WYE hi side? In a delta, doesn't it create a phase shift if you reverse some connections on the high side??
I am trying to learn some more about fault and fault currents. If a utlilty has a known fault current on the high side of a power transformer (161kv) of x amount of amps three phase. With the nameplate information given (kva,voltage,impedance) what is the forumla to determine the fault current...
Got a call from a customer whose house burnt a year ago and said rebuilt and has been living there several months. He noticed smoke the other day and called and electrician. The electrician found high voltage and thought the source was a tree that had grown up into the service between the...
Had a customer, I work for a POCO, ct. metered on the transformer bank (120/240) pole. At the rear of this plant was a local small town water tank and building which was caught off this same bank. Long story short, the plant's secondary was caught off on the load side of the plant's meter. I...
Does anyone know where to go to look up the state law for placing utility lines along a county right of way? I am in Tennessee. I have a customer that is arguing that we have no right to run a line down the side of the road in front of his property even if we stay on the county road right of...
In setting a breaker relay (ABB DPU 2000r) for the 51p element our relay is set for a ickup of 5 with a 600:5 ct ratio, this means at 600 amps the relay will pickup and operate. The time dial is 1. On the 51p-1 element the pickup is set at 7.3, what is the calculation for this element's pickup...
