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JuddJones

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Reply with quote  #1 
Who are the big players in the motor current analysis equipment? Who do you guys use and recommend for motor testing equipment?
spciesla

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Reply with quote  #2 
I believe the two biggest players are PdMA & Baker.  When I previously worked at a power plant, we were using PdMA.  We didn't have much success (i.e. get value) from periodic online testing of the motors.  But it was nice to have for diagnostics, like following up on pole-pass frequency sidebands in the vibration spectrum.
electricpete

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Reply with quote  #3 
We use a current clamp (on ct secondary) as input to our normal vibration data collector, and analyse the data in our normal vibration database.

We're just looking for pole pass sidebands around line frequency (and how high they are relative to the center component at line frequency). 

I think this small effort/expense gives you at 90% of the benefits that you might get from using fancier equipment for on-line monitoring.  PDMA does look at some other patterns in current in vicinity of rbpf which supposedly helps indicates various types of eccentricity. Also ability to check for swirl effect in vicinity of 5*LF  I've never used PDMA or these features, so I probably don't have a good ability to judge it. But fwiw I don't feel deprived not having these capabilities.  It is probably more the comfort factor of "we've always don't it this way" rather than a full understanding of what I'm missing.
Beatnik

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Reply with quote  #4 
PDMA/Baker is mostly usefull to know the condition of your isolation. For that it's complementary to vibration in a good way. It's offline analysis, so the motor must be stopped.

Current analysis is more similar to vibration and can be done with vibration data collectors while the motor is running. it sees broken or loose rotor bar well. To me there is much less value than the Baker but it's also much cheaper and simpler.
electricpete

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Reply with quote  #5 
"It's offline analysis"
pdma offers on-line and/or off-line, depending on which instrument you use.
op mentioned current analysis, which would be on-line.
Beatnik

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Reply with quote  #6 
Quote:
Originally Posted by electricpete
"It's offline analysis"
pdma offers on-line and/or off-line, depending on which instrument you use.
op mentioned current analysis, which would be on-line.



Edit: PDMA and Baker are brand name, it's confusing:

SKF (owner of the Baker brand) call them static and dynamic analyzer.

Static is what we called "Baker", it's off-line testing that check mostly the quality of the isolation: http://www.skf.com/binary/21-281526/PUB-CM-P2-14773-EN-Baker-AWA-IV-series-brochure.pdf

Dynamic is what we call current analysis, it's on-line testing : http://www.skf.com/binary/21-155464/PUB-CM-P2-14547-EN-EXP4000-brochure.pdf


Edit #2:

PDMA offer a machine that does both: MCEmax http://www.pdma.com/pdfs/mcemax_specs.pdf

Their pure Dynamic tester (current analysis) is the Emax: http://www.pdma.com/pdfs/emax_specs.pdf

And the Static tester is MCE. http://www.pdma.com/pdfs/mce_specs.pdf






Feel free to correct me again if needed [smile]
MarkL

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Reply with quote  #7 
Skf do both online and offline, and they even have an online continuous product now derived from Baker called Net Ep. Also the microlog can do MCSA as well through a current clamp.
http://www.skf.com/group/products/condition-monitoring/surveillance-systems/on-line-systems/motor-performance-monitoring-netep/index.html



marksl

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Reply with quote  #8 
Any opinions regarding the Aegis Shaft Voltage Testerâ„¢ Digital Oscilloscope. I'm interested in testing for stray shaft voltages.
MarkL

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Reply with quote  #9 
Vendor warning.
Hi, Mark, We are agents for the 'Inpro Seal' smart CDR system and theyre latest offering the 'Smart Ground Monitor'I Highly recommend it. continous detection of the shaft voltage with a local visual indicator or can be sent to bms
It offers continous detection of the shaft voltage with a local visual indicator or can be sent to Scada. Find details attached.

http://www.inpro-seal.com/en_US/system-and-bearing-protection/shaft-grounding-solutions/smart-shaft-grounding/smart-ground-monitor/
marksl

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Reply with quote  #10 
Quote:
Originally Posted by MarkL
Vendor warning.
Hi, Mark, We are agents for the 'Inpro Seal' smart CDR system and theyre latest offering the 'Smart Ground Monitor'I Highly recommend it. continous detection of the shaft voltage with a local visual indicator or can be sent to bms
It offers continous detection of the shaft voltage with a local visual indicator or can be sent to Scada. Find details attached.

http://www.inpro-seal.com/en_US/system-and-bearing-protection/shaft-grounding-solutions/smart-shaft-grounding/smart-ground-monitor/


Looks very interesting, what sort of dollars are we talking?
MarkL

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Reply with quote  #11 
I've the guy from Inpro meeting me for dinner tomorrow night and I will get you some figures, what size motor shaft you on about Mark, let me know and can size it on that.
marksl

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Reply with quote  #12 
Quote:
Originally Posted by MarkL
I've the guy from Inpro meeting me for dinner tomorrow night and I will get you some figures, what size motor shaft you on about Mark, let me know and can size it on that.


I'm not 100% sure, but I think it's 75mm
MarkL

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Reply with quote  #13 
Cheer's Mark, Leave it with me.
electricpete

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Reply with quote  #14 
marksl and markl - 
You guys should've coordinated your usernames better to help folks like me that are easily confused!


I'm just kidding about coordinating your usernames, but not kidding about me being easily confused (I never noticed that difference in the username until I saw you guys posting in the same thread)
MarkL

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Reply with quote  #15 
Funny Enough Pete I was kinda thinking the same Last Night, well the Upper case is me and I am in Ireland, the Other Chaps in Australia I think.. [biggrin][biggrin][biggrin][biggrin]





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