Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

Electrical techniques: current, flux and power monitoring

Electrical techniques: current, flux and power monitoring

For access to this article, please select a purchase option:

Buy chapter PDF
£10.00
(plus tax if applicable)
Buy Knowledge Pack
10 chapters for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Condition Monitoring of Rotating Electrical Machines — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This chapter shows that electrical techniques are powerful tools for the condition monitoring of electrical machines, particularly axial leakage flux, current and power, offering the potential to provide a general condition-monitoring signal for the machine. The availability of high-quality, digitally sampled mechanical vibration and electrical terminal data from electrical machines opens the possibility for more comprehensive monitoring of the machine and prune mover or driven machine combinations. However, these signals generally require broad bandwidth (>50 kHz) and a high data rate for adequate analysis. Therefore the principal difficulty of applying these techniques is the complexity of the necessary spectral analysis and interpretation of their content. This situation is made more difficult if variable speed drives are involved because tune domain signals may no longer be stationary and will also be polluted by harmonics from the power electronic drive. Comprehensive monitoring of an electrical machine can be achieved by measuring shaft flux, current, power and electrical discharge activity. These are broad bandwidth (generally >50 kHz) signals requiring complex analysis. Shaft flux, current and power signals are capable of detecting faults in both the electrical and mechanical parts of a drive train. Shaft voltage or current is an ineffective condition monitoring technique for electrical machines. Shaft flux monitoring is non-mvasive and uses a single sensor but it is complex to analyse and untested in the field. Current monitoring is also non-mvasive, but uses existing sensors and has established itself as motor current spectral analysis, a reliable and widely accepted technique for machine monitoring. Power monitoring is also non-mvasive, uses existing sensors but requires less bandwidth (<10 kHz) and less complex spectral interpretation to detect faults but is not yet widely accepted, so it deserves investigation for future development.

Inspec keywords: electric machines; condition monitoring; spectral analysis; vibrations; fault diagnosis; electric sensing devices

Other keywords: axial leakage flux; fault detection; digital sampled mechanical vibration; electrical techniques; power signals; spectral analysis; condition monitoring; shaft flux monitoring; power monitoring; variable speed drives; shaft voltage; power electronic drive; electrical terminal data; single sensor; a drive train; electrical machine monitoring; electrical discharge activity; current monitoring

Subjects: a.c. machines

Preview this chapter:
Zoom in
Zoomout

Electrical techniques: current, flux and power monitoring, Page 1 of 2

| /docserver/preview/fulltext/books/po/pbpo056e/PBPO056E_ch9-1.gif /docserver/preview/fulltext/books/po/pbpo056e/PBPO056E_ch9-2.gif

Related content

content/books/10.1049/pbpo056e_ch9
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address