HGTS 1250kV/1250kVA SF6 Gas Insulated Test Transformer

This 1250kVA ultra-high voltage transformer delivers precision performance with dual-voltage operation (625kV or 1250kV) and industry-leading ≤5pC partial discharge in a maintenance-free SF6 design.

Electrical Specifications

• Rated Capacity: 1250kVA

• HV Output: 625kV or 1250kV @ 1A

• LV Windings: 2×3kV/208.3A

• Frequency: 50Hz

• Waveform Deviation: ≤3%

Performance Highlights

• Partial Discharge: ≤5pC @ 1250kV (≤3pC @ 1000kV)

• Dielectric Loss: <0.5%

• Noise Level: ≤65dB(A)

• Impedance Voltage: ≤15%

Dual-Voltage Operation

Advanced Protection Systems

• 5/5 CT Monitoring: Real-time HV current measurement

• Overload Protection: 1.2A for 300s (120% rated current)

• Overvoltage Withstand: 1312.5kV (105%) for 60s

• Short-Circuit Test: 3×1000kV discharges via damping resistor

Insulation Performance

Dielectric Properties

• HV-LV winding insulation >1500MΩ

• 10kV/1min LV winding withstand

• 5kV/1min HV terminal withstand

Thermal Performance

• ΔT ≤65K at full load

• 5min on/30min off duty cycle

• 20 cycles/day maximum

Industrial Applications

Power Equipment Testing

• Ultra-HV cable qualification

• GIS circuit breaker tests

Manufacturing QA

• Transformer factory tests

• High-voltage component validation

Operational Guidelines

• Maintain strict 5min/30min cycling

• Monitor SF6 pressure before operation

• Verify CT system functionality

• Use proper HV safety protocols