Surge protection of a large medium voltage motor-a case study

Author

Sutherland, Peter E.

Author_Institution

GE Power Syst., Schenectady, NY, USA

fYear

1997

fDate

11-16 May 1997

Firstpage

36

Lastpage

40

Abstract

The raw mill motor in a cement mill had been damaged by repeated switching surges and subsequently rewound. New arresters were placed on the motor at that time. The surges coming in to the motor were measured, and the surge protection was reviewed. It was found that the original gapped silicon carbide surge arresters on the motor had insufficient protective margin, while the new zinc oxide arresters provided an adequate margin. The operation of the surge capacitors in protecting the motor was analyzed. Surge protection and insulation coordination should be reviewed in comprehensive power system studies

Keywords

arresters; cement industry; electric motors; industrial power systems; insulation co-ordination; motor protection; power system protection; power system transients; MV motor surge protection; ZnO; ZnO surge arresters; case study; cement mill power systems; insulation coordination; protective margin; raw mill motor; surge capacitors; surge measurements; switching surges; Arresters; Capacitors; Insulation; Medium voltage; Milling machines; Power system protection; Silicon carbide; Surge protection; Surges; Zinc oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial and Commercial Power Systems Technical Conference, 1997. Conference Record, Papers Presented at the 1997 Annual Meeting., IEEE 1997

Conference_Location

Philadelphia, PA

Print_ISBN

0-7803-3825-1

Type

conf

DOI

10.1109/ICPS.1997.595985

Filename

595985