Plant & Works Engineering October 2022

14 | Plant & Works Engineering www.pwemag.co.uk October 2022 Maintenance Matters Focus on: Maintenance Software tracking, and arcing. Each anomaly has a distinct sound and can easily be identified and confirmed through the use of ultrasound spectrum analysis. Corona, the ionization of air surrounding an electrical connection above 1000 volts, is heard using the ultrasound instrument as a steady, uniform, static sound. When looking at the recorded ultrasound of corona in spectrum analysis software, very distinct and evenly spaced peaks or harmonics can be seen. The harmonics appear every 50Hz. You can also see frequency content, peaks within the peaks, between the 50Hz harmonics. These are signature features to look for when analyzing recorded ultrasounds of corona. Being able to detect corona with ultrasound is particularly helpful because corona typically does not produce significant heat to be detected with infrared. This article was a contribution by UE Systems. For further information please visit: https://www.uesystems.com/ Sound Spectrum of Tracking Sound Spectrum of Arcing With electrical inspection, the well-defined 50Hz harmonics will diminish as the condition becomes more severe. The example below is from a recorded sound file of Tracking. Tracking typically has a more distinct continuous frying and popping sound. Also, notice the increased amplitudes indicating a more intense sound versus the amplitudes of corona. The analysis of arcing is even more evident of the loss of the uniform 50Hz or 60Hz harmonics. With arcing, the electrical discharge becomes more erratic and has sudden starts and stops of the discharge. This can be seen in the time series view of a recorded sound file of arcing. Name: Company Name: Address: Post Code: Tel: Total Number of Copies @ £ p+p Total £ Drives S & S Hyd H/B Pne H/B Ind Mot Comp H/B H/B Air QUANTITY QUANTITY Hydraulics & Pneumatics There are now 6 of these handy reference books from the publishers of the Drives & Controls and Hydraulics & Pneumatics magazines. Published in an easily readable style and designed to help answer basic questions and everyday problems without the need to refer to weighty textbooks. We believe you’ll find them invaluable items to have within arms reach. From the publishers of QUANTITY QUANTITY QUANTITY 2-5 copies £4.30, 6-20 copies £4.10, 20+ copies £3.75. QUANTITY PRACTICAL ENGINEER’S HANDBOOKS HYDRAULICS INDUSTRIAL MOTORS SERVOS AND STEPPERS PNEUMATICS COMPRESSED AIR INDUSTRIAL ELECTRIC DRIVES PLEASE ALLOW UPTO 28 DAYS FOR DELIVERY $&! -!.5&!#452).' -%$)! ,4$ 4HE (IGH 3TREET 4ONBRIDGE +ENT 4. "% Postage and Packaging: 1-3 copies: £2.99 4-6 copies: £4.99 7 or more copies: £6.99 If you would like to obtain additional copies of the handbooks, please email info@dfamedia.co.uk or call us on 01732 370340.Alternatively you can return the completed form below to: Engineers Handbook, DFA MANUFACTURING MEDIA LTD, 192 The High Street,Tonbridge, Kent TN9 1BE #HEQUES SHOULD BEMADE PAYABLE TO $&! -ANUFACTURING -EDIA ,TD AND CROSSED ! # 0AYEE #OPIES OF THE HANDBOOKS ARE AVAILABLE AT a PER COPY $ISCOUNTS ARE AVAILABLE FOR MULTIPLE COPIES