Main probem is our utility trying to Parallel all 4 ,115/24 kV 8%impedance, 60 MVA Tranformers with tie breakers closed. The only way to reduce current is increase transformer reactance and voltage drop for a fault might not be a problem as it is a stiff system with banks paralled. But for a...
Sorry about the confusion,these are 60 mva transformers and series reactors create a high x/r ratio
I am trying to figure out how to calculate feeder reactance value to limit fault currents
Hello All
I have 4 115/24 kV 60 MVA transformer banks with 8% impedance. When all the banks are tied the fault levels becomes high. feeder reactors are used to limit fault current on the feeder side. But 24 Kv side has fault levels that require use of 40 KA breakers. But I am planning to...
I meant by "putting reactors on the bus" is to have OR Shunt Reators at the Bus. May be with this fault current I don't need Shunt reactors at the Bus.
Please comment
Hello All,
I have a 115/24 Kv station with two Banks 60 MVA each and there are feeders going out of the station. Each feeder has a feeder reactor precceding a 25 kAmps breaker. The 3 phase fault level at the Bus with 2 banks tied on 24Kv side is 15KAmps. This is less than the 25 kA breakers...
Hi
I have installed three phase regulators after a transformer.Do I need some sort of station service to operate the regulators. In the drawings, I have show a 50 KVA padmount. I understand that a recloser would require a 50 KVA padmount to operate the D.C controls to open and close the...
