HET 200kVA/33.2kV Exciter Transformer

Mode: HET 200kVA/33.2kV
Rated frequency: 60Hz
Rated capacitance:200kVA
HV winding is independent winding:
HV winding voltage:16.6kV/33.3kV
HV winding current: 6A at 33.3kV;12A at 16.6kV
Rated frequency: 30-300Hz
Rated input current: 400A
Cooling methods: ONAN
Heat-resistance: A grade, 25# transformer oil
Working time: continuous working 60 min under rated output capacitance, winding≤65K, oil surface≤55K;
Partial discharge level: ≤10pC under rated volage, ≤5pC under 80% of rated voltage.
Sound level: 60dB Impedance level:≤5% Insulation level: LV winding 5kV/1mn; HV winding withstand 60s at 50kV.
Structure requirement: air reactor, cooper lead wire winding, Insulation level :HV terminal 1.1times rated voltage with 1min,low voltage winding to earth 3kV/1min Exciter transformer protection: equip piezoresistor for each HV output, exciter transformer’s input and output terminal connects with the ground via zinc oxide arrester, this methods can protect the operator and the equipment itself when test object breakdown. Structure: steel housing, HV bushing equips on the oil tank, equips wheels, movable, oil tank is shell-type, lead out the Low voltage with porcelain bushing. Each terminal is lead out by relative voltage grade bushing. HV bushing lead wire go through isovolumetric capacitance core, exterminal insulation is fiber glass bushing. Bushing has corona rings. Oil tank has oil conservator to make sure the capacitance core in the oil. HV bushing can guarantee 35kV corona free. 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: