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.
1 Symptoms of arsenic poisoning vary with the type and concentration of the poison. 2  Inorganic arsenic may cause abdominal pains, destruction of red blood cells (hemolysis), shock, and death quickly. Chronic poisoning has a better outcome. 2  Arsenic is found in groundwater, many chemicals, and foods. 3  If arsenic is in the organic form, it is likely nontoxic or weakly toxic to humans, but inorganic arsenic can also be found in similar locations and materials and in high concentrations in industrial processes.