I. Mga Kalunasan sa Pagdisenyo sa Yutang Pisikal
Ang disenyo sa yutang pisikal sa AIS voltage transformers nagtubag sa matangis nga operasyon. Para sa 66 kV outdoor AIS voltage transformers (pillar-type structure):
Materyales sa Pillar: Gamiton ang epoxy resin casting + metal frame para sa makapugos nga kaluwasan, resistensya sa polusyon/klima. Kinahanglan og espesyal nga disenyo para sa 66 kV (vs 35 kV & below). Ang dry-type insulation (porcelain/epoxy shell) kinahanglan og sapat nga resistensya labi sa pagbend o impact para sa harsh nga panlabas.
Pagdissipate sa Heat: Depende sa natural convection; siguradohon nga ang temperatura sa winding ≤ 80 K. Para sa electronic types, idugang ang forced air cooling/thermal materials (e.g., heat pipe modules control bus temp rise < 65 K sa 40 °C, 14% below industry standards).
Anti-Vibration: Sumplian ang GB/T 20840.11 - 2025 (transport: 10 g vibration elements; post-transport checks). Gamiton ang shock-absorbing brackets/damping materials (e.g., honeycomb cardboard + polyurethane foam; internal displacement < 1 mm under 3 g transport sa 5000 m altitude).
II. Insulation Medium & Structure Design
Korente sa performance sa insulation, seguridad, ug environment-friendly:
Sealing: Single-channel multi-seal groove (22% - 25% compression rate). EPDM “O”-rings, stainless steel welded tanks, double-layer O-rings nagsiguro sa airtightness (annual leakage ≤ 0.5%). Sumplian ang weld checks (X-ray, dye) ug hydrostatic tests.
Insulation Structure: Para sa electromagnetic types, gamiton ang side-yoke cores o 3-single-phase combinations. Para sa capacitive types, optimize capacitor dividers/electromagnetic units. Sumplian ang electrical clearance/creepage (e.g., PD3: 12 kV system creepage ≥ 240 mm).
III. Environmental Adaptability Design
Nagtubag sa reliable nga operasyon sa panlabas:
Temperature: Operate at -40 °C ~ +55 °C (GB/T 4798.4). Gamiton ang stable nga materyales (silicone rubber/epoxy resin; 155 °C epoxy passes IEC 60216-1). Optimize heat dissipation (e.g., silver-plated copper bars pass 1000-hour salt spray, contact resistance change ≤ 15%).
Anti-Pollution: Disenyo batas PD3 (high CTI epoxy, RTV coatings). E.g., polyurea coatings (≥ 1 mm) improve UV resistance 3x (QUV test: ΔE < 3 after 5000 h).
Anti-Aging: Verify via IEC tests (CTI, thermal aging, salt spray). Gamiton ang tinned copper bars (≥ 15 μm; pass 56-day damp-heat tests). Inkluso protection (anti-aging/rust-resistant explosion-proof membranes; avoid water/frost heave).
IV. Safety Protection Design
Nagtubag sa seguridad sa sistema/equipment:
Fuses: Primary: RW10-35/0.5 (0.5 A, 1000 MVA breaking). Secondary: 3-5 A (protection), 1-2 A (metering); fusing time < protection action time.
Grounding: Sumplian ang “single-point grounding” (primary neutral, secondary at control room, tertiary open-delta). Sumplian ang resistance standards (varies by type/scenario).
Explosion-Proof: Membrane bursting pressure = 2× rated (e.g., 66 kV: 0.8 MPa for 0.4 MPa rated). Gamiton ang anti-aging/rust-resistant materials (polycarbonate/stainless steel); avoid water/frost heave.
VIII. Conclusions & Suggestions
Ang disenyo sa AIS voltage transformer nagkinahanglan og komprehensibo nga pagtuon sa yutang, insulation, environment, seguridad, ug intelligence.
Design Tips: Pillar structure (epoxy + metal frame); heat dissipation (optimize convection, add cooling if needed); anti-vibration (shock-absorbing materials, test validation).
Safety: Fuses (matching specs), single-point grounding, explosion-proof membranes (2× rated pressure, anti-aging materials).
Ang mga future designs magfocus sa environmental-friendliness, intelligence, ug digitization. Sumplian ang standards/specs aron masiguro ang stable nga operasyon.
