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Damper Winding Fault Detection in Synchronous Machines
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis aims to identify methods for detection of damper winding faults in synchronous machines (SMs) powered by variable frequency drives (VFDs). The problem of failing damper windings has received attention after reports of serious damage which have been discovered during maintenance checks. Since SMs often are used for critical applications, failures can be devastating if they cause total breakdowns. Also, VFDs are believed to cause additional stress in the damper windings of SMs and since the utilisation of VFDs is increasing, the problem is expected to become more common in the future. Currently, there is no method for detection of failures during normal operation of SMs, thus research in the area is required.

Simulations based on the finite element method as well as laboratory experiments have been performed in order to examine the impact of VFDs and to find a way of detecting damper winding failures. The results confirm that utilization of VFDs produce higher currents in the damper winding compared to direct-online operation. The results also show that in case of a damper bar failure, the current distribution among the damper winding segments is affected. However, monitoring of all damper winding segments is unrealistic due to the number of sensors required. Another approach, which has been investigated, involves monitoring of the current through the pole interconnectors of one of the endrings. Potential fault indicators have been found by analysing the currents in the frequency domain. However, further studies are required in order to evaluate the method. Also the temperature of the damper winding was investigated as an indicator.

Place, publisher, year, edition, pages
2016. , 54 p.
Series
UPTEC ES, ISSN 1650-8300 ; 16 032
Keyword [en]
Fault detection, condition monitoring, motor diagnostics, synchronous machines, synchronous motors, electrical machines, motor drives, damper winding, damper bars
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-307503OAI: oai:DiVA.org:uu-307503DiVA: diva2:1047185
External cooperation
ABB Corporate Research Center Sweden
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2016-11-23 Created: 2016-11-16 Last updated: 2016-11-23Bibliographically approved

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Electrical Engineering, Electronic Engineering, Information Engineering

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