- The issue appears to be on 230kV side; 75kVA transformer is stepped down from 230kV line. Once 230kV breaker trips (due to intentional, planned trip), there is a charge from 230kV underground cable (about 7km long) between two stations; one of the path to the ground is through this unit which...
thanks for replies so far.
Voltage Y-axis is left as 160V (LG) before trip. The current is right it it depicts only few amps before the trip. The load on AC board is not major such that there would be an excessive inrush of 1200A. (HVAC unit is about 8kW).
To respond to Warros and Protolash...
Protection and control building is supplied via 75kVA (208/120V) service via source A (station service transformer stepped from 230 kV line to 208V, 3ph). At few instances, source A dropped and automatic transfer switch (ATS) switches to source B (208V/120V supply by local utility). ATS output...
Hello,
I am looking for an approved method to calculate induced current on a metallic armour.
Fiber optic cable is buried in the same trench as power cable (230kV cable) - the distance is about 1ft. The fiber optic cable has armouring (steel wires). I am looking for a IEEE standard or method...
I would like to know a proper guide to size grounding transformer for a wind farm (ohms and MVA rating, continuous rating for 10 sec and short time rating for 3 seconds).
Following is assumed data: 34.5kV bus (line to line voltage at a switchgear bus), like to ground fault current given as I =...
