Partial Discharge Free SF6 Gas Insulated Test Transformer (GTU)

Equipment Type: Indoor

1.2 Ambient Temperature: -25°C to +40°C;

1.3 Relative Humidity: 90% at +25°C;

1.4 Altitude: Not exceeding 1,000 m;

1.5 Seismic Resistance: Grade 8;

1.6 Atmospheric Conditions:

Atmospheric pressure: 0.1 MPa; the atmosphere must be free of contaminants, corrosive substances, and explosive materials that could seriously affect the insulation of the current transformer.

1.7 A reliable grounding point must be provided, with a grounding resistance not exceeding 0.5 Ω.

1.8 Partial Discharge Background Level: Not exceeding 2 pC.

1.9 Power supply frequency range: 49.5–50.5 Hz;

1.10 The user must provide an independent 380 V power supply with a capacity of no less than 400 kVA; the power supply voltage waveform must be a true sine wave with a waveform distortion rate of <1%;

• Input Voltage: 380V
• Rated Output Voltage: 500kV
• Rated Power: 300 kVA;
• Partial Discharge Level at Rated Voltage: ≤2 PC; at 80% of Rated Voltage: ≤1.0 PC;
• Impedance Voltage: ≤12%;
• Overcurrent Capacity: 1.1 times the rated current for 1 minute;
• Overvoltage Capacity: 1.1 times the rated voltage;
• Insulation Medium: SF6
• Annual Gas Leakage Rate: ≤0.5%;