Ultrasound application on switchgear
Ultrasound application on switchgear
(OP)
We have been performing IR and ultrasound inspection on 22/11 kV switchgears. We would like to talk to people who have experience on ultrasound scanning. How do you determine the criticality of the equipment, say you got dB of 32 at 40kHz. how critical is the equipment? What if you got 0 dB but audible hissing sound. Is there any need to reduce the frequency? Is there any standard on decibel limit on switchgear....?looking forward to your response.....
thank you.
thank you.






RE: Ultrasound application on switchgear
http://www.mt-online.com/current/3-97ultra.html
http://www.corona-technology-course.com/forum/
http://www.tibsgroup.com/press/White%20Papers/Detection%20of%20Partial%20Discharges....html
The following quote is from the last link -
Although the ability to gauge intensity and view sonic patterns is important, it is equally important to be able to "hear" the ultrasounds produced by various equipment. That is precisely what makes these instruments so popular. They allow inspectors to confirm a diagnosis on the spot by being able to clearly discriminate among various equipment sounds.
This is accomplished in most ultrasonic translators by an electronic process called "heterodyning" that accurately converts the ultrasounds sensed by the instrument into the audible range where users can hear and recognize them through headphones.
RE: Ultrasound application on switchgear
Visit
http://www.mt-online.com/current/05-98ml.html
http://www.sdt.be/03applications/acorona.html
http://www.usgweb.com/Power.htm#Ultrasonic
etc. for more info
RE: Ultrasound application on switchgear
RE: Ultrasound application on switchgear
RE: Ultrasound application on switchgear
regards
RE: Ultrasound application on switchgear
http://www.transinor.no/transinor/products/aia/pdf/cigre.pdf
for: The partial discharge detection at a high AC voltage level is the most effective method.
RE: Ultrasound application on switchgear
Similar to the used for Transformers (different frequency sensors).
These ultrasonic and acoustic methods depends very much in the operators skill and experience, for the noises in a substation.
In GIS and transformers is used for finding the location, once it is detected a PD (by IEC 270 method for example).