ٹیکنیکل پروپوزل: ہائبرڈ گیس آنسولیشن پر مبنی سی ٹی ریلی ایبلٹی میں بہتری کا حل

Application Scenario:​​ ایکسٹریم سرد علاقوں (-40°C ماحول)، ماحولیاتی طور پر کارگر پروجیکٹ (مثال کے طور پر، نارڈک وینڈ پاور گرڈ کنکشن اسٹیشن)

​Core Goal:​​ گیس-اینسولیٹڈ سوچ گیر (GIS) میں کرنٹ ٹرانسفارمرز (CTs) کی لمبی مدت کی قابلیت کو بہتر بنانے کا دلچسپی کا مرکزی مقصد ہے جبکہ کربن کم ماحولیاتی ضروریات کو پورا کرتے ہوئے۔

​I. Insulation Medium Optimization: SF₆/N₂ Hybrid Gas Technology​

• ​Parameter - Solution Design​
• ​Gas Ratio:​​ SF₆ (80%) + N₂ (20%) mixture
• ​Insulation Strength:​​ At 20°C & 0.5MPa, insulation strength ​>85% of pure SF₆
• ​Environmental Performance:​​ GWP (Global Warming Potential) reduced by 70%, significantly lowering greenhouse gas impact
• ​Low-Temperature Suitability:​​ Hybrid gas liquefaction point ≤ -60°C, ensuring ​no liquefaction risk​ at ​​-40°C​ in extreme cold environments

​II. Anti-Partial Discharge Shielding Design​

• ​Structural Innovation:​​
1. ​Epoxy Resin Casting:​​
• CT coils manufactured using vacuum casting process, epoxy resin filling rate >99.9%, eliminating internal voids.
2. ​Equipotential Metal Shielding Mesh:​​
• Zinc-plated copper mesh added to the outer layer of the casting body, maintained at equipotential to the CT primary conductor.
• Eliminates surface electric field distortion and suppresses partial discharge.
• ​Performance Validation:​​

• PD (Partial Discharge) level <5 pC (per IEC 60270 standard)
• Passed -40°C thermal cycling test, with no risk of insulation cracking.

​III. Dynamic Temperature Rise Control System​

• ​Intelligent Control Architecture:​​
  Sensor Layer → Control Layer → Execution Layer
  PT100 Temp Sensors → GIS Monitoring System → Fan Speed Control Module
• ​Function Implementation:​​
• ​Real-time Monitoring:​​ Built-in PT100 probes (±1°C accuracy) locate CT hotspot temperatures.
• ​Active Cooling:​​ Automatically activates GIS fan arrays when temperature rise exceeds threshold (e.g., ΔT >40K).
• ​Energy Efficiency Optimization:​​ Fan power dynamically adjusted based on demand, reducing wasted energy.

​IV. Key Technical Advantage Comparison​

​V. Scenario Adaptability Validation​

1. ​Extreme Cold Wind Power Scenario (Nordic):​​
• Passed -40°C /72h cold start test; CT ratio error ≤ ±0.2%.
• Optimized Pressure-Temperature curve for hybrid gas prevents excessive pressure drop at low temperatures.
2. ​Environmental Compliance:​​
• Complies with EU F-gas Regulation (No.517/2014) restrictions on SF₆ usage.
• Life cycle carbon footprint reduced by 52% (per ISO 14067 standard).

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