Ultra-High Voltage (UHV 1000 kV) Transformers and SCB18 Dry-Type Technology
Engineering review of 1000 kV UHV AC power transformers, electric field grading, transposed disc windings, and SCB18 Class H dry-type transformer performance.
1. 1000 kV UHV AC Transmission Technology
Ultra-High Voltage (UHV 1000 kV AC) transformers transmit bulk power (>5000 MW) across distances >1500 km with minimal transmission line losses.
2. UHV 1000 kV Dielectric Insulation Parameters
| Insulation Parameter | UHV 1000 kV Rating | Standard 400 kV Grid Rating |
|---|---|---|
| Rated Voltage (Un / Um) | 1000 kV / 1100 kV | 400 kV / 420 kV |
| Lightning Impulse (BIL) | 2250 kV peak | 1425 kV peak |
| Switching Impulse (SIL) | 1800 kV peak | 1050 kV peak |
| Power Frequency (Ud) | 1100 kV RMS | 630 kV RMS |
| Partial Discharge Level | < 50 pC at 1.5 × Um / √(3) | < 100 pC at 1.5 × Um / √(3) |
3. Electric Field Grading & Insulation Architecture
To prevent surface flashovers under 1100 kV continuous stress:
- Non-linear field-grading electrostatic barrier rings.
- High-density pressboard oil ducts with multi-angle oil flow diverters.
4. SCB18 Class H Dry-Type Distribution Innovation
In secondary distribution, SCB18 series cast-resin dry transformers utilize Class H (180°C) Nomex aramid insulation, reducing no-load losses by 30% and noise below 45 dB(A).
*Reference: IEC 60076-3:2018; GB/T 24842-2018; CIGRE TB 738.*
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