DocumentCode :
2316871
Title :
Starting of large medium voltage motors design, protection and safety aspects
Author :
Bredthauer, Jürgen ; Struck, Norbert
Author_Institution :
Siemens AG, Berlin, Germany
fYear :
1994
fDate :
12-14 Sep 1994
Firstpage :
141
Lastpage :
151
Abstract :
Large induction and synchronous electric motors play an essential role in petrochemical installations. The availability and operating safety of large HP motor drives are influenced by the frequently-encountered difficult starting conditions and the correct selection and setting of protective devices. Motor data, required for monitoring functions, such as locked-rotor time, starting time or starting cycle are determined using different calculation methods and criteria, as motor manufacturers apply various techniques and limit values and no uniform standards exist. If these data, which have been determined using different techniques, are interpreted in the same way, this can result in protection levels, which either limit the availability or reduce the motor lifetime. Calculation methods for protection-relevant data are compared with measurements and discussed. Especially for large HP motors, only state-of-the-art computer based calculations are able to provide results, realistically defining the actual motor stress levels. Drives in classified locations require special attention when selecting protection devices for starting and operation
Keywords :
chemical industry; induction motor protection; petroleum industry; safety; starting; synchronous motor protection; design; drives; induction motors; locked-rotor time; medium voltage motors; monitoring functions; motor lifetime reduction; motor stress levels; petrochemical installations; protection; safety; starting; starting cycle; starting time; state-of-the-art computer based calculations; synchronous motors; Electric motors; Electrical safety; Induction motors; Medium voltage; Production; Protection; Protective relaying; Rotors; Stators; Synchronous motors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Petroleum and Chemical Industry Conference, 1994. Record of Conference Papers., Institute of Electrical and Electronics Engineers Incorporated Industry Applications Society 41st Annual
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-1987-7
Type :
conf
DOI :
10.1109/PCICON.1994.347621
Filename :
347621
Link To Document :
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