Tap Changer Acoustic/Vibration-Based Condition Monitoring System 1 - PowerPoint PPT Presentation

Tap Changer Acoustic/Vibration-Based Condition Monitoring System 1

Background Record Goal: to process information recorded data NIA funded during each tap with DSP and AI project to test Acoustic/ change tools looking for Will lead to feasibility of vibration switching event trends referable improved asset detecting acquisition for a period of to ageing of management of problems system two years tapchanger tap changers 2

System overview Transformer control kiosk Tap changer Tap changer monitoring system 2G/3G link SFTP server collects vibration and current waveform Ambient generated by each Temperature switchover probe 2x temperature probes 4x accelerometers (1x tap changer tank temp, or AE sensor 1x transformer tank temp.) Tap position 4x CTs (1x transformer current, 3x tap changer motor current) Mains power input 3

Acquisition module High and not scalable cost Relatively low sampling frequency (50kHz) Proprietary and high cost development tools (LabView) Limited amount of data means high failure risk of statistical analysis approach 4

Acquisition model Complete custom USB acquisition module GSM designed antenna Flexible 8 channel 24bit 192kHz differential input Usb Auxiliary isolated analogue input Auxiliary isolated digital I/O All sensors 4 input for RTD temperature sensor USB interface compatible with any Linux PC using standard drivers Acquisition module designed and tested in Tap changer Buzby2 about 6 months acquisition module Cost effective and quantity scalable solution 5

Vibration and acoustic sensors Analysis of mechanical vibration produced by gear and switch Require sensor capable of vibration detection with phase coherence across spectrum up to 10kHz 15kHz ICP Industrial accelerometer used (0.5 to 10-15kHz) 6

Vibration and acoustic sensors Detection of noise produced by arcing and PD during switching Require sensor capable of detect high frequency acoustic energy (> 50kHz, where mechanical noise 150kHz roll off) Acoustic emission resonating sensor used (15 to 150kHz) 7

Vibration and acoustic sensors Acquisition module can sample up to 192kHz so can be used with all kind of sensor (AE requires specific preamp) Hi quality industrial accelerometer 20kHz is similar cost to AE sensor and seems capable to detect energy up to 100kHz. 8

Electro-mechanical system Acquisition Module GSM Antenna Buzby2 EPC Power Supply Customized enclosures Cooling and suitable for indoor/outdoor Heating system 9

Project status Electromechanical Acquisition module Linux software Three alpha fully designed fully designed and designed and prototype installed (Lisburn) tested (Parma) tested (Glasgow) and commissioned Statistical analysis of incoming data Basic statistic Site inspections 40 systems and algorithm implemented on carried out to plan installation development to server (Parma) installation scheduled determinate “system condition” 10

Alpha Prototype Installations Complete Introduction of Each system waveform from specific lossless should generate Accelerometer and 3 Alpha prototype compression about 2/3 GB per CTs @ 192kHz installed and reduced data size month Preliminary “hand- Temperatures commissioned on by 50% Down sampling of crafted” data July 2017 Tap position for Installed system CT’s waveform analysis has each switching Winifred Road generate on should be identified issues event Primary average 3/4 events implemented to on 2 of 3 Altrincham Grid All data sent to per day each reduce data of monitored tap Baguley Primary remote server around 15/25MB about 30% changers 11

Alpha prototype installation: Winifred Rd Site: Winifred Road Primary Tap changer type: Ferranti DC3 During the selector movement phase of last step of switching sequence 5->4->3 or 3->4->5 arcing noise presence can be clearly heard. Any other 4->3 or 4-5 switchover switchover 12

Alpha prototype installation: Winifred Rd The arcing noise indicates that tap 4 contact of one of the three selectors is excessively worn Observing tap usage statistics shows that tap 4 is the most used tap position. Currently the tap changer is on fixed tap awaiting inspection. 13

Alpha prototype installation: Altrincham Site: Altrincham Grid Tap changer type: Fuller HS319  Recorded anomalous events  2/3 time per week always involving tap 8  Currently under investigation 14