HET 200kVA/25kV,20kV,15kV Exciter Transformer

Mode: HET 200kVA/25kV,20kV,15kV
Rated frequency: 50Hz
Single phase
Rated capacitance: 200kVA
Rated frequency: 30-300Hz
Rated input current: 2x285.7A
Rated input voltage: 2x300V, 2x350V, 2x400V
Rated output voltage: 15, 20, 25kV
Rated output current: 8A
Cooling methods: ONAN
Heat-resistance: A grade, 25# transformer oil
Sound level: 60dB
Partial discharge level < 5pC at rated voltage.
Temperature raise: winding≤65K, oil surface≤55K.
Impedance level: ≤5% Insulation level: LV winding 5kV/1mn; HV winding withstand 60s at 50kV.
Structure requirement: air reactor, cooper lead wire winding, 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: