HET 450kVA/6kV,5kV,3.75kV Exciter Transformer

Mode: HET 450kVA/6kV,5kV,3.75kV
Rated frequency: 25Hz
Using frequency: 20Hz – 300Hz
Rated capacitance: 450kVA
Rated input voltage: 2x350 / 2x 400 / 2x450V(Double winding, rated input 2x 350V,each winding has two taps: 400V, 450V, can be serial connection or parallel connection)
Maximum input current: 2x 642.8A
Rated voltage/current of HV winding: HV side is double winding,each winding has 3.75kV, 120A; 5kV, 90A; 6kV, 75A HV
Cooling methods: ONAN Heat-resistance: A grade, 25# transformer oil
Working time: one hour on, one hour off, three cycle per day, winding≤65K, oil surface≤55K
Sound level: 65dB
Insulation endurance class: A class
Partial Discharge Level: <=10pC

Structure requirement: oil immersed shell type；silicon steel plate is DQ130-30 high quality cooling rolling silicon steel plate, Bm value very low; Transformer has double coils, cooper lead wire, Low voltage winding and HV winding, adopt electrostatic shielding between two windings which has the function of isolation filter; equips measuring coil, used to measure HV side voltage; there are oil expansion tank and moister absorber on transformer; Oil temperature thermograph and oil level indicator are set on oil expansion tank;  Transformer’s spare part and component, e.g. bushing, valve and oil conservator’s structure and layout will not affect the transportation. There are also enough safety distance between transformer HV and LV winding, will not cause partial discharge and corona when testing.

Principle Diagram: