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

fYear

2014

fDate

18-20 June 2014

Firstpage

512

Lastpage

514

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2014 International Symposium on

Conference_Location

Ischia

Type

conf

DOI

10.1109/SPEEDAM.2014.6871941

Filename

6871941