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.
Add to that the fact that the main symptoms of arsenic poisoning â violent vomiting and diarrhoea â mimic those of many stomach bugs common in the 19th century, and the lack of laboratory tests to help doctors with diagnosis, and itâs easy to understand why it was seen as the almost perfect murder weapon.