HET 300kVA/1.8kV,0.9kV Exciter Transformer

Mode: HET 300kVA/1.8kV,0.9kV
Phase: single phase
Rated frequency: 25Hz
Working frequency: 20-300Hz
Cooling: ONAN
Rated capacity: 300KVA
Rated low voltage: 2x400, 2x460, 2x500V
Rated high voltage: 0.9, 1.8KV
Rated low current: 2x326A
Rated high current: 166A
Impedance voltage: ≤5%
Noise: ≤60dB (A)
Structural requirements: Using Oil-immersed steel structure; and should provide the copper bus for connections of low voltage winding when combined. The internal structure of the transformer should be no loose after the normal rail, road transport, and lifting. Excitation transformer protection: In the output side of high-voltage bushing, in order to prevent the influence of harmonic to excitation transformer, a  capacitor will be paralleled to the output side of high voltage bushing. The design of flux density of the transformer needs to be considered in t low frequency.    Exciter transformer insulation characteristic: Exciter transformer insulation levelwill determin transformer’s safety work and insulation ageing speed. To guarantee no flashover- which coming from external, electric potential raise and cause damage to the main insulation and minor insulation. We will also set insulation layer between HV windings and turn-to-turn. Winding is cylinder type. Capacitance is determin by the winding’s area. When design, we’d try our best to make sure the top and bottom has same area, and compensate with electrostatic shield to improve the initial voltage distribution. Winding skeleton is made of compound insulation tube: can get down partial discharge and shielding the iron coil.

Principle Diagram: