Title :
An applied laboratory characterisation approach for electric machine insulation
Author :
Kavanagh, Darren F. ; Howey, David A. ; McCulloch, M.D.
Author_Institution :
Dept. of Eng. Sci., Univ. of Oxford, Oxford, UK
Abstract :
Insulation is a fundamental part of electric machines as it provides suitable electrical isolation between the different parts and sub-components. Developing techniques for analysing properties of insulation is extremely useful for the assessment of operating conditions, insulation quality and degradation (state of health). This paper investigates a novel non-invasive experimental approach to characterise phase-to-phase and phase-to-ground insulation by measuring electrical impedance and derived parameters (capacitance, dissipation factor) over a wide frequency range (100 to 2 MHz) at various different temperatures. Due to its simplicity the method lends itself better to an electrostatics interpretation compared with the typical twisted pair approach. Analysis is presented for the method which show its effectiveness under different operating conditions. This work has important applications in the area of condition monitoring of insulation using impedance based measurements.
Keywords :
condition monitoring; electric impedance measurement; electric machines; electrical maintenance; fault diagnosis; insulation testing; machine insulation; machine testing; organic insulating materials; polymer films; condition monitoring; copper wires; degradation; dissipation factor; electric machine insulation; electrical isolation; electrostatics interpretation; frequency 100 Hz to 2 MHz; ground wall insulation; impedance phase; nomex paper; phase-to-ground insulation; phase-to-phase; polyamide-imide; polymeric materials; Capacitance; Impedance; Impedance measurement; Insulation; Temperature; Temperature measurement; Wires;
Conference_Titel :
Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), 2013 9th IEEE International Symposium on
Conference_Location :
Valencia
DOI :
10.1109/DEMPED.2013.6645745