For dry-type transformers having a 220 [degrees] C insulating system and a winding hot-spot temperature of 220 [degrees] C, and with no unusual operating conditions present, the 20-yr life expectancy is a reasonable time frame.he 80 [degrees] C transformer requires operation at 75% or more of full load for a 2-yr payback, and at 100% load to payback in 1 yr over the 150 [degrees] C transformer.
Exposure to arsenic through drinking water is a great threat to human health. Arsenic is a carcinogen and its consumption can negatively affect the gastrointestinal tract and cardiac, vascular and central nervous systems.
However, as long as the Arsenic is in the body, it will continue to cause physiological damage. Exposure to small doses of Arsenic compounds over a long period of time can result in lung, skin or liver cancer, or cancer of the lymphatic system. Damage to organs, such as the esophagus, can cause speaking difficulties.