DocumentCode :
1896889
Title :
Calculation method for power transformer clamping rings made from laminated insulating materials
Author :
Biggie, Kevin M. ; Prevost, Thomas A.
Author_Institution :
EHV-Weidmann Industries Inc., St. Johnsbury, VT, USA
fYear :
2001
fDate :
2001
Firstpage :
567
Lastpage :
576
Abstract :
In core-form oil-filled power transformers, clamping rings are used to hold a clamping force on the windings. In this paper, data is presented from mechanical tests conducted on complete rings, using a custom-built test fixture, specifically designed to simulate the forces and conditions seen on clamping rings in power transformers. The tests were conducted on laminated wood and laminated pressboard rings, in sizes typically seen in medium power transformers. Mechanical equations that most closely apply to a ring under these loading conditions were determined, and flexural strength, modulus of elasticity and shear strength calculations were performed. A new method for calculating clamping ring thickness was determined, based on the test data. For laminated pressboard, the new calculation method was compared to a previous calculation method. A statistical interpretation of the values obtained using the new calculation method vs. the test results is presented
Keywords :
bending strength; insulation testing; laminations; power transformer insulation; power transformer testing; shear strength; transformer oil; transformer windings; core-form oil-filled power transformers; flexural strength; laminated insulating materials; laminated pressboard rings; laminated wood; mechanical tests; modulus of elasticity; power transformer clamping rings; shear strength; winding clamping force; Assembly; Circuits; Clamps; Conducting materials; Fixtures; Laminates; Power transformer insulation; Power transformers; Steel; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 2001. Proceedings
Conference_Location :
Cincinnati, OH
ISSN :
0362-2479
Print_ISBN :
0-7803-7180-1
Type :
conf
DOI :
10.1109/EEIC.2001.965760
Filename :
965760
Link To Document :
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