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Main Structural Features:
NOMEX® Insulation + Transformer Insulation Oil
1. High-Temperature Resistance for Enhanced Safety
At an ambient temperature of 40°C, it can operate continuously at 100% load. Under the same temperature, the continuous load rate is on average 20% higher than that of oil-immersed transformers.
2. Low Loss for Energy Efficiency
Energy savings of 20% compared to ordinary transformers.
3. Maintenance-free and Environmentally Friendly
The lifespan of the seals matches that of the transformer. All materials are recyclable.
Technical Innovations:
1. High-temperature resistant hybrid insulation system.
2. Compact structural design.
3. Seven-level temperature control technology ensuring operational safety.
4. Thirty-year lifespan design.
5. Fully automated robotic lamination with a 45-degree fully oblique seven-level step lamination structure.
Measures to Enhance the Sudden Short-Circuit Resistance of 110kV Oil-Immersed Power Transformers:
Enhancing the sudden short-circuit resistance of 110kV power transformers is primarily ensured through design calculations and manufacturing processes.
1. Design Measures:
(1) Ampere-Turn Balance Calculation:
Conduct reasonable ampere-turn balance calculations for the transformer coils to effectively control the maximum unbalanced ampere-turns, thereby minimizing the short-circuit mechanical forces to the greatest extent.
(2) Mechanical Stress Tolerance:
Mechanical stress tolerance is considered an endurance test. Copper wire is a malleable material, and if the deformation of the copper wire is less than 0.2% after a transformer short circuit, the windings can recover from deformation. Select soft copper wire (Σ0.2=90MPa) or semi-hard copper wire (Σ0.2=120~260MPa) based on the maximum short-circuit mechanical force the transformer can withstand, ensuring that the average critical stress Σ0.2 of the copper wire remains within a reasonable and safe range.
(3) Strength and Stiffness Calculation:
Calculate the strength and stiffness of clamping parts, tension plates, selected pressure plates, and compression devices to meet the safety requirements of maximum short-circuit mechanical forces.
(4) Densification of Winding Blocks:
Utilize densified treatment for winding blocks and prefer hard cardboard with a high modulus of elasticity for manufacturing.
2. Manufacturing Process Measures:
(1) Tight Control in Three Aspects:
Ensure tight control over three aspects of the transformer body: tightly winding the coils, tightly fitting the transformer body, and tightly compressing the transformer body.
(2) Verification of Ampere-Turn Balance:
Verify the designed ampere-turn balance against the manufactured ampere-turn balance and strictly control the maximum unbalanced ampere-turns.
(3) Application of Pre-Stress:
Apply pre-stress during manufacturing to prevent loosening during transformer operation, reducing short-circuit mechanical forces.
(4) Height Tolerance Control:
Strictly control the height tolerance of the same-phase windings after drying treatment to ensure uniform compression of all windings.
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