Improving the sealing performance of transformer tanks requires a comprehensive approach throughout their entire lifecycle, from design and manufacturing to installation and maintenance. The core principles are optimized structural design, strict control of process quality, standardized installation operations, and enhanced testing methods. Specific measures include:
Structural Design Optimization
Adopt a Fully Sealed Structure: Replace traditional oil conservators with corrugated tanks or expansion radiators to completely isolate oil from air, avoiding leakage risks caused by "breathing."
Improve Sealing Surface Form: Prioritize structures with sealing grooves or limiting round steel bars to facilitate control of seal compression and improve sealing stability; avoid using easily deformable flat butt joint structures.
Enhance Local Strength Design: Add reinforcing ribs to stress concentration areas such as high-voltage outlets and riser seats, and conduct strength analysis using simulation tools such as ANSYS to prevent cracking due to vibration or pressure changes.
Manufacturing Process Improvement
Strictly Control Welding Quality: Employ advanced processes such as gas shielded welding to ensure uniform welds free of pinholes and pores; perform post-weld grinding and cleaning to prevent weld slag from damaging the sealing surface. Select high-performance sealing materials. Use oil-resistant, aging-resistant, and highly elastic nitrile rubber or fluororubber seals to ensure long-term operation without failure.
Conduct factory sealing tests. Perform pressure or vacuum leak tests according to GB/T 6451 standard: no leakage after 24 hours at 50 kPa pressure, or verify sealing performance using the oil column method or air pressure method.
