Title :
Continuous condition monitoring of the electrical insulation of AC motors without disconnection
Author :
Grebchenko, N.V. ; Smirnova, M.A. ; Kozhukhar, A.V.
Author_Institution :
Fac. of Electr. Eng., Donetsk Nat. Tech. Univ., Donetsk, Ukraine
Abstract :
A new method of monitoring the condition of the electrical insulation of the stator windings of AC motors and increasing the sensitivity of current protection against phase-to-ground faults are proposed. The method is based on the introduction of an additional magnetomotive force (m.m.f.) in a magnetic core of zero sequence current transformers. Frequency of this m.m.f. is different from the network power-frequency. The working algorithm of the device of control and protection of the feeders with the AC motors and the results of its tests in industrial environment are given.
Keywords :
condition monitoring; current transformers; machine insulation; machine protection; magnetic cores; stators; AC motors; continuous condition monitoring; control device; current protection; electrical insulation; feeders protection; industrial environment; magnetic core; magnetomotive force; network power-frequency; phase-to-ground faults; stator windings; zero sequence current transformers; AC motors; Current transformers; Insulation; Magnetic cores; Monitoring; Sensitivity; Windings; AC motor; control of insulation; phase-to-ground fault; power cable; protection; sensitivity; zero sequence current transformer;
Conference_Titel :
Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2014 International Symposium on
Conference_Location :
Ischia
DOI :
10.1109/SPEEDAM.2014.6871941
