​HCTT-2x250kV/750kVA AC Test Transformer

Mode: HCTT 2x250KV/750KVA
Cylinder type,  Single phase
Working frequency: 50/60/100/120Hz
Rated capacity: 750KVA
Rated voltage:  LV voltage: 2*3KV    
                            HV voltage:500KV
Rated current: LV current: 2*125A  
                           HV current: 1.5A
Waveform distortion rate: ≤3%,     No-load current: <10%
Impedance voltage: ≤12%,                Voltage ratio of measuring winding: 2000:1
Dielectric loss: <0.4%,                         Noise level: ≤60db

Over current ability: continuous working for 300s at 120% rated current without any damage and distortion to transformer winding;
Over voltage ability: working for 60s at 110% rated voltage without any damage to transformer insulation,  waveform distortion ≤5%;
PD level: <5pC under 100% rated voltage; <3pC under 80% rated voltage
Working time: continuous working for 60 min under 100% rated voltage and rated current is allowed;
Temperature rising:  temperature rising of transformer winding is ≤65K, temperature rising of transformer oil is ≤55K
Protection: between lower LV winding and upper LV winding of test transformer installed 3 KV MOA.

Upper Stage: 
HCTT-250kV/375kVA AC Test Transformer
Cylinder type,   Single phase
Working frequency: 50/60/100/120Hz
Rated capacity: 375KVA
Rated voltage:  LV voltage: 3KV   
                            HV voltage:  250KV
Rated current: LV current: 125A   
                           HV current: 1.5A
Waveform distortion rate: ≤3%,    No-load current: <10%
Impedance voltage: ≤4.5%,             Dielectric loss: <0.4%
Noise level: ≤60db
PD level: <5pC under 100% rated voltage; <3pC under 80% rated voltage

Over current ability: continuous working for 300s at 120% rated current without any damage and distortion to transformer winding;
Over voltage ability: working for 60s at 110% rated voltage without any damage to transformer insulation,  waveform distortion ≤5%;
Working time: continuous working for 60 min under 100% rated voltage and rated current is allowed;
Temperature rising:  temperature rising of transformer winding is ≤65K, temperature rising of transformer oil is ≤55K

Insulation features:
HV winding to LV, measuring winding to ground: >1500MΩ；
LV winding to HV, measuring winding to ground: >1500MΩ；
Measuring winding to HV, LV winding to ground: >1500MΩ；

Insulation level:  test transformer LV input winding to ground, power frequency withstand level: 10KV/MIN; test transformer measuring winding to LV winding, HV winding to shell withstand level: 5KV/MIN

Lower Stage
HCTT-250kV/750kVA AC Test Transformer
Cylinder type,   Single phase
Working frequency: 50/60/100/120Hz
Rated capacity:  LV Capacity: 750KVA 
                            HV Capacity: 375KVA 
                            Total capacity: 375KVA
Rated voltage:  LV voltage: 2*3KV    
                            HV voltage:250KV  
                           Total voltage: 3KV
Rated current: LV current: 2*125A   
                          HV current: 1.5A 
                          Total Current: 125A
Waveform distortion rate: ≤3%,     No-load current: <10%
Impedance voltage: ≤4.5%,               Dielectric loss: <0.4%
Noise level: ≤60db
PD level: <5pC under 100% rated voltage; <3pC under 80% rated voltage

Over current ability: continuous working for 300s at 120% rated current without any damage and distortion to transformer winding;
Over voltage ability: working for 60s at 110% rated voltage without any damage to transformer insulation,  waveform distortion ≤5%;
Working time: continuous working for 60 min under 100% rated voltage and rated current is allowed;
Temperature rising:  temperature rising of transformer winding is ≤65K, temperature rising of transformer oil is ≤55K

Insulation features:
HV winding to LV, measuring winding to ground: >1500MΩ;
LV winding to HV, measuring winding to ground: >1500MΩ;
Measuring winding to HV, LV winding to ground: >1500MΩ;
Insulation level:  test transformer LV input winding to ground, power frequency withstand level: 10kV/min; test transformer measuring winding to LV winding, HV winding to shell withstand level: 5kV/min

Principle Diagram: