
Application Scenario: Mga rehiyon ng ekstremong lamig (-40°C na kapaligiran), mga proyekto na may mahigpit na pagsusunod sa kalikasan (halimbawa, mga nord风力并网站在极寒地区(-40°C环境)和环保要求严格的项目(如北欧风电并网站)。
Core Goal: Pataasin ang matagal na kapani-paniwalang mga Current Transformers (CTs) sa loob ng Gas-Insulated Switchgear (GIS) habang sinusunod ang mga pangangailangan para sa mababang carbon na kapaligiran.
I. Insulation Medium Optimization: SF₆/N₂ Hybrid Gas Technology
- Parameter - Solution Design
- Gas Ratio: SF₆ (80%) + N₂ (20%) mixture
- Insulation Strength: Sa 20°C & 0.5MPa, insulation strength >85% ng tuloy-tuloy na SF₆
- Environmental Performance: GWP (Global Warming Potential) bawas ng 70%, malaking pagbawas sa epekto ng greenhouse gas
- Low-Temperature Suitability: Liquefaction point ng hybrid gas ≤ -60°C, naseguro na walang risk ng liquefaction sa -40°C sa ekstremong lamig na kapaligiran
II. Anti-Partial Discharge Shielding Design
- Structural Innovation:
- Epoxy Resin Casting:
- Ang CT coils ay gawa sa proseso ng vacuum casting, epoxy resin filling rate >99.9%, nag-eeliminate ng internal voids.
- Equipotential Metal Shielding Mesh:
- Idinagdag ang zinc-plated copper mesh sa outer layer ng casting body, maintained at equipotential sa primary conductor ng CT.
- Nag-eeliminate ng surface electric field distortion at nag-suppress ng partial discharge.
- Performance Validation:
- PD (Partial Discharge) level <5 pC (ayon sa IEC 60270 standard)
- Nagpasok sa -40°C thermal cycling test, walang risk ng 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
Indicator
|
Traditional SF₆ CT
|
This Solution: Hybrid Gas CT
|
Insulation Lifetime
|
25~30 years
|
>40 years
|
GWP Value
|
100% (SF₆=23,900)
|
Reduced by 70%
|
Low-Temp Reliability
|
Prone to liquefaction at -30°C
|
Stable operation at -40°C
|
Partial Discharge Control
|
10~20 pC
|
<5 pC
|
V. Scenario Adaptability Validation
- Extreme Cold Wind Power Scenario (Nordic):
- Nagpasok sa -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.
- 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).