RSO tests
RSO tests
(OP)
Can anyone explain what is Recurrent Surge Oscillograph (RSO) test of Generator Rotor and how it is done ?
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RE: RSO tests
RE: RSO tests
An example of related test equipment may be www.bakerinst.com
RE: RSO tests
The surge test is potentially destructive. It uses relatively high voltages... on the same order as the dc hi-pot test voltages.
I believe the RSO is non-destructive and uses much lower voltages (perhaps 10 volts or less?) although still short rise times.
Someone posted a link with lots of info on rso in response to edison's question on another board
http://www.epri.com/attachments/224581_ShortedTD.pdf
Both tests use a principle of comparing two identical windings... look for similar traces. My casual observation from the above link is that the curve doesn't look like any surge tests results I have seen... surge tests usually have more oscillation. I'm not sure why that would be and whether there are other substantial differences beyond the voltage used. Anyone else care to comment on how a rso test is similar/different than a motor surge test?
RE: RSO tests
RSO (or TDR, time-domain reflectometry) is low voltage so it will not find any weaknesses in the inter-turn insulation that may at some future stage turn into a full short. Surge testing however does provide that "punch", the electrical stressing of the inter-turn insulation. Hence I think it is generally more applicable to electrical machines except as mentioned above.
The big question with surge testing is: how hard do you punch, too much and you may damage a healthy winding, too little and it won't find the weaknesses. Also, does it propagate sufficiently through all the turns?
RE: RSO tests
http://www.spectrum.ieee.org/WEBONLY/publicfeature/feb01/wire.html
for Time Domain Reflectometry (TDR), Frequency Domain Reflectometry (FDR) and Standing-Wave Reflectometry (SWR)
RE: RSO tests
I like Paul (A.S.) Gill’s perspective in his book on electrical testing: before starting a critical test, make sure there are spare parts immediately available.
RE: RSO tests
RE: RSO tests
I like Paul (A.S.) Gill’s perspective in his book on electrical testing: before starting a critical test, make sure there are spare parts immediately available.
///This is certainly a sure way to do it. However, considering nowadays trends, e.g. Wall Street approach to electrical enginering and testing, the extra requisites tend to be discarded if some harmless testing methods and instruments are applied.\\\