AIS VT/PT Dual-Enhanced Precision and Insulation Solution
Core Objective: Precision Improvement and Insulation Reinforcement
Applicable Scenarios: Coastal power plants, chemical plants, high-humidity/high-pollution harsh environments
I. Technical Pain Points Analysis
Traditional AIS-VT faces two core issues in complex environments:
- Precision Drift:
- Dielectric constant variation due to humidity fluctuations and contaminant accumulation, causing secondary-side output error exceeding limits (>Class 0.5).
- Insulation Failure Risk:
- Surface flashover induced by salt mist/chemical pollutants, reducing breakdown voltage by >30%.
II. Innovative Technical Solutions
- Insulation System Upgrade: Nano-Composite Silicone Rubber Bushings
- Material Properties:
- Hydrophobicity lifespan ≥25 years (IEC 62073 accelerated aging verified), suppressing moisture penetration.
- Pollution flashover withstand voltage ↑40% (≥145 kV/m under salt fog test).
- Structural Optimization:
- Angled shed design + multi-level creepage extension, improving self-cleaning efficiency by 50%.
- Dynamic Precision Compensation System
- Temperature/Humidity Sensors: Embedded high-precision sensors (±0.5% RH/±0.1℃) for real-time environmental monitoring.
- AI Compensation Algorithm: Maintains stable 0.1-class accuracy (IEC 60044-2024 Class 0.1) across all operating conditions.
- Anti-Ferroresonance Magnetic Circuit Design
- RFC Damping Circuit: Parallel nonlinear resistors (10kΩ~1MΩ adaptive adjustment) suppress resonant overvoltage.
- Zero-Sequence Flux Cancellation: Symmetric dual-magnetic circuit structure reduces harmonic distortion to <0.2%.
III. Performance Validation (IEC Standard Tests)
|
Test Item |
Traditional Solution |
This Solution |
Improvement |
|
Power Frequency Withstand |
95 kV (dry)/70 kV (wet) |
130 kV (dry)/115 kV (wet) |
+37% |
|
Pollution Flashover (E5 class) |
28 kV |
40 kV |
+43% |
|
Annual Failure Rate |
>1.5% |
0.2% |
↓87% |
|
Temp. Cycling Error |
±0.5% |
±0.1% |
5× higher precision |
IV. Technical Advantages Summary
- Extreme Condition Resilience:
- Certified for C5-M corrosion resistance (ISO 12944), withstands pH=2~12 chemical environments.
- Lifecycle Cost Optimization:
- Maintenance cycle extended to 10 years; O&M costs reduced by 60%.
- Smart Expansion Capability:
- Supports IEC 61850 communication interface for real-time data upload to smart grids.
V. Application Cases
- Coastal Wind Farm (avg. humidity 85%):
- After replacing 32 traditional AIS-VTs: zero annual flashover faults; metering error stabilized at Class 0.1.
- Chlor-Alkali Chemical Plant (chlorine corrosion):
- Zero insulation degradation after 18 months; bushing hydrophobicity maintained HA-grade (highest class).
Compliance Standards: IEC 60044-2024 / IEEE C57.13 / GB/T 20840.7-202X
