Minimal Maintenance for Dry-type Transformers
Dry-type transformers from MBT Vietnamtransformer are renowned for their reliability and longevity, requiring minimal maintenance compared to oil-cooled alternatives. These transformers offer significant benefits in terms of performance and safety, with fewer risks and hazards associated with the use of oil.
According to Mr. Le Lam, our dry-type transformer specialist at MBT Vietnamtransformer, the fact that these units are air-cooled makes them much easier to maintain. The primary focus of maintenance is ensuring the airflow is unobstructed, which can sometimes be compromised by dust accumulation.
“To allow effective cooling, it's important to regularly inspect the transformer and make sure there's no excessive dust buildup,” Mr. Le Lam explains. “In certain environments, especially dusty ones, debris can gather and impede the free flow of air, leading to potential overheating.”
Dust accumulation is easily handled by using simple tools like a leaf blower to clear dust off the transformer, ensuring efficient heat transfer and optimal performance. Regular cleaning of the transformer is essential, particularly in industries like mining, where dust levels are typically higher. Failure to clear these dust layers can lead to temperatures rising beyond design parameters, ultimately degrading the insulation and reducing the unit’s lifespan.
Even transformers housed in sealed enclosures (≥ IP55) are at risk when doors are inadvertently left open, allowing dust to enter. Mr. Le Lam emphasizes the importance of keeping temperature probes accurate, as these are crucial for monitoring unexpected temperature spikes. Accurate measurement will trigger alarms and, in the event of overheating, trip the feed-in circuit breaker to prevent damage.
Additionally, the terminals should be checked regularly, as vibrations and other factors may cause connections to loosen. Proper torque must be maintained to prevent issues like partial discharge or heat buildup, which could lead to severe damage.
At MBT Vietnamtransformer, we provide a comprehensive maintenance manual with every installation. This manual outlines the necessary maintenance schedules, which typically involve yearly inspections in clean indoor environments. For outdoor or dusty environments, maintenance is recommended every six months to ensure optimal performance.
“Beyond the standard requirements, we provide tailored maintenance guidelines specific to the application and operating environment,” says Mr. Le Lam. “We also offer on-site maintenance services when needed, ensuring that our customers have access to detailed reports and recommended actions.”
While maintenance for dry-type transformers is generally straightforward, Mr. Le Lam stresses the importance of de-energizing the transformer before any work begins, a task that must be performed by a qualified technician to ensure compliance with medium voltage equipment regulations. Proper lock-out and isolation procedures are critical for safety.
“A significant advantage of dry-type transformers is that maintenance is faster and simpler compared to oil-cooled transformers,” Mr. Le Lam adds. “For oil-cooled units, oil samples need to be tested and analyzed regularly, which adds considerable cost and time to their overall maintenance.”
With MBT Vietnamtransformer, you can expect not only world-class dry-type transformers but also maintenance support tailored to your specific needs, ensuring optimal efficiency and extended lifespan for your equipment.
