ROUTINE CAST RESIN MAINTENANCE

It is a good idea to also inspect cast-resin transformers once a year. More inspections may be needed depending on the transformer’s age, wear, and location. Cast-resin transformers use air instead of oil for cooling. These units can function for years without ever having a problem. But if a cast-resin suddenly goes down, it could mean thousands of dollars in losses. That’s why many companies schedule bi-annual and even quarterly inspections. When performing routine maintenance on cast-resin units, consider the following tips:

Inspect enclosure
Keep unit clean
Check temperature monitoring systems

External Inspection

Check the area around your cast-resin to ensure there is no external damage to the unit. Also ensure that there aren’t any boxes or other objects resting on the unit or covering up the air vents. Listen for loud or unusual noises. Like with liquid-filled units, unusually loud humming may indicate overloading or overvoltage issues.

You can inspect the external enclosure from a safe distance while your unit is energized. Ensure to de-energize your unit for any internal inspection or maintenance.

Enclosure Cleaning

Due to their open ventilation, cast-resin accumulate dust and debris inside their enclosures. Built up dirt provides tracking paths for arc faults. Regularly remove this dust and dirt to keep your transformer running safely. Also make sure the ventilation ports are free of debris, so the unit can cool properly.

This requires regular cleaning. Since air is the cooling medium, restricted air flow can affect a cast-resin’s performance. If debris blocks air flow, the transformer could overheat. During an inspection, remove accumulated dust around the filter grates. For details on cleaning out the enclosure refer to our 600v cast-resin manual.

Check Temperature Monitoring System

If your unit has cooling fans, inspect them for signs of wear or corrosion. Make sure the blades are not deformed. The motor should run smoothly without making any strange noises.

Warnings and Recommendations

For most systems, an annual maintenance schedule works well. Transformers serving mission critical applications may require more frequent inspections. Consider the following maintenance tips for both types of transformers.

Don’t Overload

A transformer’s kVA should account for the highest loading situation. If the unit is overloaded, you’ll notice higher temperatures. Continuous overloading results in overheating and eventually insulation failure.

Consult Manufacturer’s Manual

Always refer to the manufacturer’s instructions for your transformer before consulting other resources. The manufacturer’s guide will provide information about your specific transformer.

Transformer Repair and Replacements

If you identify issues during an inspection or test, address them quickly. If you need your transformer examined or repaired, fill out the form below. We offer a variety of field service and repair options including inspections, tests, and full reconditioning.

The transformer manufacturing plant of CTC in Vietnam

CTC specializes in providing products such as Oil Transformer, Amorphous Transformer, Dry Transformer, Reactor Coil, and other electrical equipment. With 15 years of experience in the field of electricity and transformer manufacturing, we are confident that we can provide you with the optimal solution

– Information source: Maddox Transformer