>400kV Range
HCTT 2x625kV/1250kVA Test Transformer
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HCTT-2x625kV/1250kVA Test Transformer

Lead time: 120days

Mode: HCTT 2x625KV/1250KVA
Cylinder Type                                                     Single phase
Frequency: 50Hz                                                Cooling methods: ONAN
Rated Capacity: 1250kVA                                 Rated voltage: 1250kV
Rated Current: 1A
(HV terminal of the transformer will be earthed through a current transformer 5/5 so as to check the current value of HV side and ensure safety of the operators and equipment.)
Waveform deviation ≤3%                               Impedance voltage ≤15%
Dielectric loss < 0.5%(20℃)      Noise level < 65dB(A)
Voltage not uniformity≤±5%
PD Level: <5pC at 100%UH ,<3pC at 80%UH of complete test system
Running time and temperature raise: continuous running 1 hour at 100% UH and 100%IH; 1hour on, 1 hour off.everyday 8cycle.
Transformer winding temperature raise less than 65K, oil surface temperature raise less than 55K.
Over-current capability: withstand 300s at 120%(1.2A)IH, no damage to transformer winding.
Over-voltage capability: withstand 60s at 110%(1375kV)UH, no damage to transformer insulation.Waveform deviation ≤5%

Up Stage
Mode: HCTT-625kVA/625kV-I
Cylinder type                                               Single phase
Frequency: 50Hz
Rated Capacitance: LV :625kVA ; HV :625kVA
Rated Voltage: LV Voltage: 3kV ; HV Voltage: 625kV
Rated Current:LV current: 208.3A ; HV Current: 1A
Impedance Voltage ≤4.5%                      Waveform deviation ≤3%
Dielectric loss < 0.5%(20℃)               Noise level ≤65dB (A)
Cooling: ONAN
Over-current capability: withstand 300s at 120%(1.2A)IH, no damage to transformer winding.
Over Voltage Ability: Continuous working for 60S minutes under 110% rated voltage (687.5kV), no damage to transformer ,Waveform deviation ≤5%。
PD Level: <5pC at 100%UH of complete test system; <3pC at 80%UH of complete test system;
Continuous running 1 hour at 100% UH and 100%IH;Transformer winding temperature raise less than 65K, oil surface temperature raise less than 55K.

Insulation of Winding to Earth:
>2500MΩ (HV winding to LV winding and earth);
>2500MΩ (LV winding to HV winding and earth);
Insulation Level: 5kV/1min (LV winding to HV winding and earth)
10kV/1min (LV winding to HV winding and earth)

Sub-Stage Transformer
Type: HCTT-1250kVA/625kV-II
Single phase
Type: Cylinder Type
Frequency: 50Hz
Rated Capacity: LV capacitance: 1250kVA
HV Capacitance: 625kVA; Transfer capacitance: 625kVA
Rated Voltage: LV volt: 3kV ;HV Volt.:625kV transfer volt: 3kV
Rated Current: LV Current: 416.7 A ;HV Current: 1A, transfer current: 208.3A
Impedance Voltage: ≤4.5%
Waveform deviation ≤3%
Dielectric loss < 0.5%(20℃)
Noise level ≤65dB (A)
Cooling: ONAN
PD Level: <5pC at 100%UH of complete test system; <3pC at 80%UH of complete test system;
Over-current capability: withstand 300s at 120%(1.2A)IH, no damage to transformer winding.
Over Voltage: Continuous working for 60S minutes under 110% rated voltage (687.5kV), no damage to transformer ,Waveform deviation ≤5%

Insulation of Winding to Earth:
>2500MΩ (HV winding to LV winding and measurement winding to earth);
>2500MΩ (LV winding to HV and measurement winding to earth);
>2500MΩ (measurement winding to HV and LV winding to earth)

Insulation Level:
5kV/1min (HV winding to LV winding measuring winding and transformer shell)
10kV/1min (LV winding to HV winding and transformer shell)
5kV/1min (measurement winding to LV winding, HV winding and transformer shell)

Electric Strength of Transformer Oil:
- Dielectric Loss<0.5%(at 90℃)
- Without acetylene in oil; Solidifying point>40
Continuous running 1 hour at 100% UH and 100%IH;Transformer winding temperature raise less than 65K, oil surface temperature raise less than 55K.

Principle Diagram: 

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