Power transformers, the unsung heroes of our electrical grids, operate quietly in the background, often overlooked until a catastrophic event disrupts our power supply. While smaller transformers can be swiftly replaced, the larger ones above 500 KVA demand more time and attention. This press release sheds light on the causes of transformer failures, with a specific focus on insulation failure, an often underestimated factor.

Insulation failure in transformers can be attributed to various factors, with overloading and temperature rise being primary culprits. The press release highlights how increasing the load on a transformer elevates winding temperatures and, if within the temperature rating, does not degrade insulation. However, continuous overloading or sudden voltage spikes can weaken insulation, leading to eventual failure.

Voltage spikes, a consequence of lightning strikes or utility switching, pose another threat. Despite surge arrestors and Basic Impulse Level (BIL) ratings, these high-voltage transients can weaken insulation, causing arcing and instantaneous failure. The effects of excess heat, impurities in cooling liquids, and dirt buildup are also explored as potential contributors to insulation breakdown and transformer failure.

Understanding these factors is critical for engineers to optimize transformer performance, refine maintenance strategies, and enhance the reliability of power systems. By delving into the intricacies of insulation-related failures, the industry can better ensure the longevity of these essential components in electrical power networks.

Source: eepower.com