محولات الجهد الفائق (UHV 1000 kV) وتقنية المحولات الجافة SCB18

مراجعة هندسية لمحولات القدرة AC بجهد فائق 1000 kV، وتدرج المجال الكهربائي، والملفات القرصية المنقولة، وأداء المحولات الجافة SCB18 بعزل الفئة H.

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 ParameterUHV 1000 kV RatingStandard 400 kV Grid Rating
Rated Voltage (Un / Um)1000 kV / 1100 kV400 kV / 420 kV
Lightning Impulse (BIL)2250 kV peak1425 kV peak
Switching Impulse (SIL)1800 kV peak1050 kV peak
Power Frequency (Ud)1100 kV RMS630 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.*