Calculation of Ninimum Safety Distances for Live-Line Mintenance - A Statistical Mehod Applied to 765 kV AC Itaipu Lines
This paper presents a statistical method to calculate the miniumm safety distance for live-line maintenance. The method takes into account the complexity of the tower gap configuration and the presence of the lineman working at the line potential. It includes the inherent dispersion of the dieletric characteristics of the air gaps such as the probability of flashover and the tirnes-to-flashover. Laboratory tests were also performed to corroborate the results of the study, checking not only the performance of the various live-line tools but also the effectiveness of the by-passing insulators protective device and the occurrence of broken insulators in the string.
Live-Line Maintenance Methods
This paper covers methods and equipment for live-line maintenance. It recommends minimum insulation and approach distances calculated on an engineering basis in terms of flashover and withstand levels for equipment and gaps. These recommendations are flexible and can accommodate revision in basic concepts. They present a basis from which working clearances and methods can be developed for specific needs in particular applications.
Effect of single oral dose of DDT on the lipid metabolism of rhesus monkey
Abstract The effect of a single oral dose of DDT (150 mg/kg body wt) on the lipid metabolism of rhesus monkey has been investigated 48 hr after the administration of the drug. There was hypertriglyceridemia and increased triglyceride levels in adipose tissues of experimental animals. The increased triglyceride levels in plasma seemed to be due to their increased mobilization from the liver and decreased removal rate from plasma. However, postheparin plasma lipolytic activity (PHLA) of both protamine-sensitive and -resistant types increased in the plasma. Further, there was increased lecithin-cholesterol acyltransferase (LCAT) activity in DDT-treated animals which contributed to the increased esterified cholesterol in plasma. There was increased conversion of [14C] glucose into hepatic triglyceride but the lipid content did not change significantly in the tissue possibly due to the increased lipolytic activity and secretion into plasma.