Title :
IEC qualification test applied to capacitively graded 13.8 kV bar samples energized with repetitive fast pulses
Author :
Sharifi, E. ; Jayaram, S. ; Cherney, E.A. ; Haq, S. Ul ; Omranipour, R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Waterloo, ON, Canada
Abstract :
The paper investigates the repetitive fast pulse tests using IEC-TS 60034-18-42 as applied to 13.8 kV bar samples with two different stress grading systems: nonlinear resistive and capacitive. Insulated copper bars were furnished with a capacitive stress grading system consisting of aluminum foils embedded into the groundwall insulation forming a capacitively graded system. The effectiveness of the capacitive stress grading is shown by passing all of the IEC/TS 60034-18-42 qualification tests showing considerably lower temperature rise than resistive stress grading systems.
Keywords :
IEC standards; bars; insulation testing; machine insulation; stress analysis; IEC qualification test; aluminum foils; capacitive stress grading system; capacitively graded bar samples; groundwall insulation; insulated copper bars; nonlinear resistive stress grading systems; repetitive fast pulse test; voltage 13.8 kV; Aging; Insulation; Partial discharges; Qualifications; Stress; Surface discharges; Temperature measurement; form-wound coils; qualification test; repetitive fast pulse; resistive and capacitive stress grading; thermal stresses;
Conference_Titel :
Electrical Insulation Conference (EIC), 2011
Conference_Location :
Annapolis, MD
Print_ISBN :
978-1-4577-0278-5
Electronic_ISBN :
pending
DOI :
10.1109/EIC.2011.5996187
