Title :
Statistical evaluation of accelerated voltage endurance tests on mica insulation for rotating electrical machines
Author :
Wichmann, Arnold ; Grünewald, Peter
Author_Institution :
Siemens AG, Muelheim an der Ruhr, West Germany
fDate :
4/1/1990 12:00:00 AM
Abstract :
Accelerated voltage endurance testing at elevated test frequencies has been carried out. Testing of discrete populations at 50 and 500 Hz and identical field strength values yields acceleration factors between 3.4 and 22.2. However, if all populations with varying field strength values in the range from 5 to 24 kV/mm are combined and the theoretical frequency conversion factor of 10 is applied, the spread of the individual values is no greater than that obtained at a single test frequency. Each individual endurance curve lies within a 95% confidence limit of the other curves
Keywords :
insulation testing; life testing; machine insulation; mica; 50 Hz; 500 Hz; accelerated voltage endurance tests; acceleration factors; elevated test frequencies; endurance curves; field strength; mica insulation; rotating electrical machines; spread of individual values; statistical evaluation; Bars; Corona; Dielectrics and electrical insulation; Frequency; Insulation testing; Life estimation; Scattering; Semiconductor device testing; System testing; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
