Vibration speaking can be avoided by distributed sensing of te

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EIC paper 013: Vibration Sparking :

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 1 EIC paper 013: Vibration Sparking By Peter Kung QPS June 2013

Agenda:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 2 Agenda Vibration Sparking VibroFibre a fiber optics vibration sensor VibroFibre as a solution for Vibration sparking Simulated Vibration Sparking Carbon side ripples on fire Key signatures from Sparking Recommended Future work

What Vibration Sparking can do!:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 3 What Vibration Sparking can do!

Large vibration amplitude causes intermittent contact to ground:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 4 Large vibration amplitude causes intermittent contact to ground

Arc Corona starts, Sparking follows as the plasma collapses:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 5 Arc Corona starts, Sparking follows as the plasma collapses

VibroFibre is a low finesse cavity vibration sensor:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 6 VibroFibre is a low finesse cavity vibration sensor

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 7 Vibration causes the ‘fringe’ to move translating wavelength change into intensity change. Working Principle

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 8 VibroFiber sensor VibroFiber sensor PD event Acoustic waves Acoustic waves PD event One kind of fiber-optic PD sensors based on longitudinal direction detection mode (pin pick-up mode), which manly is used for PD sensing outside electric equipments with irregular surface such as the motors One kind of fiber-optic PD sensors based on transverse direction detection mode, which manly is used for PD sensing inside electric equipments such as generator and transformer or outside transformer with flat surface. Two types of VibroFiber PD sensors Pin-point type PD sensor Flat type PD sensor

Size of the VS sensor 7 X25X60 mm:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 9 Size of the VS sensor 7 X25X60 mm

High Frequency signals transmitted along the Mica insulation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 10 High Frequency signals transmitted along the Mica insulation

Testing results with flat type PD sensor by using PZT actuator to generate acoustic waves:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 11 30Khz 40Khz 50Khz 60Khz 70Khz 80Khz 90Khz 100Khz Testing results with flat type PD sensor by using PZT actuator to generate acoustic waves

Corona starts by showing 2 X line frequency with higher frequency components:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 12 Corona starts by showing 2 X line frequency with higher frequency components

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 13 2013-6-17 Edit: Chris 13 Multiple Sparking Signals

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 14 Our sensor shows much stronger signal from the PZT actuator , our system shows some EMI interference 2013-6-17 Edit: Mike 14

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 15 Effect of air flow Equipment: 7300V AC Arcing unit Piezoelectric actuator PD sensor(20mm cavity) T-PD on line monitor system Coil sample 2013-6-17 Edit: Chris 15 PZT actuator Air flow at about 5.845m/s Sensor wrapped inside green tape Sparking

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6/17/2013 Vibration Sparking is a real threat to air cooled Generators 16 Noise floor 29 mV PZT PD signal (40KHz) No air flow 2013-6-17 Edit: Chris 16

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6/17/2013 Vibration Sparking is a real threat to air cooled Generators 17 Noise floor increases to 45mV Same PZT PD signal with air flow 2013-6-17 Edit: Chris 17

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6/17/2013 Vibration Sparking is a real threat to air cooled Generators 18 Sensor detects both PZT and Arcing signals Arcing signal 2013-6-17 Edit: Chris 18

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6/17/2013 Vibration Sparking is a real threat to air cooled Generators 19 Sparking signal 10.46KHz 2013-6-17 Edit: Chris 19

Simulated Vibration Sparking:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 20 Simulated Vibration Sparking

Sparking thru the semiconducting ripple:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 21 Sparking thru the semiconducting ripple

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 22 2013-6-17 Edit: Chris 22 Vibration Sparking simulator 3000V AC precipitron, one connects coil, the other connects to Ripple , the assembly is driven by a speaker at 120Hz Coil 3000V AC precipitron Speaker 120Hz A:1v Side ripple spring Interrogation unit Computer Picoscope sensor

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 23 Vibration sparking (time domain signal) 2013-6-17 Edit: Chris 23

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 24 2013-6-17 Edit: Chris 24 Response frequency Without sparking Vibration sparking signal (FFT)

Future work:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 25 Future work Further elimination of EMI on our receiver electronics Use high finesse FBG cavity and laser locking to reduce optical noise, objective is to achieve 50db signal to noise Test on long coil , objective is to be able to sense Vibration Sparking outside the generator

PowerPoint Presentation:

6/17/2013 Vibration Sparking is a real threat to air cooled Generators 26 vibration measurement with fiber gratings 26 Please contact Peter Kung for more discussion Telephone 1-514-697-4728 Cell phone 1-514-578-6766 Email peter@qpscom.com SKYPE: peter.kung.qps Thank you for your attention

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