When it comes to ensuring the reliability and safety of power distribution systems, pad-mounted transformers are a popular choice for many utilities and industrial operations.
These transformers are equipped with a variety of standard accessories designed to enhance their performance, provide better monitoring, and ensure safe operation.
This blog will explore the essential accessories commonly included in pad-mounted transformers, such as tap changers, fuses, bushings, and more. Understanding these components will help you appreciate how they contribute to the efficiency and longevity of the transformer while ensuring a safe, reliable power supply.
Fuses
Fuses are commonly used in all types of distribution transformers. Pad-mounted transformers are typically equipped with “Bay-O-Net” fuses and current-limiting fuses.
Bay-O-Net fuses are an initial, easily replaceable expulsion fuse in distribution transformers. Current-limiting fuses are used as a backup or for protection against high-level faults. They are often used together to create a very effective protection system.
High/low voltage bushings
High-voltage bushings can handle the electrical stress associated with a transformer’s input or output. They use multiple layers of insulation, including oil, to manage voltage distribution and prevent electrical discharge.
Low-voltage bushings, made of epoxy resin, nylon, or other polymers, handle lower voltage and current levels on the output side of a transformer.
Bushings prevent electrical arcing and maintain a reliable connection between the distribution transformer and external circuits.
Temperature, air pressure, and oil level gauges
Temperature gauges help ensure that transformer oil and windings stay in safe operating conditions. Overheating is a major cause of distribution transformer failure. Some gauges include high-temperature alarms and remote temperature monitoring.
Air pressure gauges monitor tank pressure, which is especially important for transformers with nitrogen blankets. Proper pressure helps maintain oil quality and prevents moisture ingress. A pressure drop can indicate a leak, while air pressure relief valves can be used to release excess pressure.
Oil level gauges indicate the level of insulating oil in the transformer. Maintaining the correct oil level is critical for cooling and insulation. Low levels can expose core and coil components, while high levels can cause over-pressurization.
Grounding systems
Grounding systems are very important for safety and system stability. They provide a low impedance path for fault currents to go to the earth, minimizing the risk of electric shock to personnel.
Grounding allows for the quick and reliable detection of ground faults, allowing protective devices like circuit breakers to isolate the fault quickly.
Providing a reference to ground helps limit the voltage rise on the transformer and connected equipment during faults.
Tap changer
The primary purpose of a tap changer is to ensure that the transformer’s output voltage remains within acceptable limits, even when the input voltage fluctuates or the load changes.
Tap changers are often located on the high-voltage side of the transformer. They help maintain power quality, reduce energy losses, and extend the life of connected equipment.
Tap changers work by changing the number of turns in one of the transformer windings, usually the high-voltage winding.
Get everything you need from UTB Transformers
Whether it’s bushings, gauges, tap changers, grounding systems, or fuses, UTB Transformers is your trusted source for high-quality, reliable replacement accessories.
Used by utilities nationwide, our products ensure the safety, efficiency, and longevity of your transformers. Our fast-responding team is ready to provide the solutions you need. Contact UTB Transformers today for a quote, and let us help keep your equipment running smoothly.
