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Effects of smart meter RF on GFCI units

Effects of smart meter RF on GFCI units. Caroline Storm Sponsored by: Dr. David Wetz, Simon Donahue. Introduction to GFCIs. Introduction to Smart Meters. Introduction to GFCIs. The Problem. Construction sites power lines are exposed to the weather , for safety they have GFCIs on the line

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Effects of smart meter RF on GFCI units

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  1. Effects of smart meter RF on GFCI units Caroline Storm Sponsored by: Dr. David Wetz, Simon Donahue

  2. Introduction to GFCIs

  3. Introduction to Smart Meters

  4. Introduction to GFCIs

  5. The Problem • Construction sites power lines are exposed to the weather , for safety they have GFCIs on the line • The GFCIs are installed close to the Smart Meters • Due to the proximity the GFCIs are tripping

  6. Hypothesis • The RF created magnetic field is causing the differential transformer to detect extra current on the hot side relative to the neutral side • Where does the interference originate? • Magnetic coupling on the hot line • Magnetic coupling with the differential transformer • RF transmission being picked by internal wiring in the smart meter • Magnetic field effecting the solenoid

  7. Discoveries thus far • Two identical GFCIs, except the material used for the hot line • When copper is used for the hot line, GFCI does not trip • Covering the hot line in copper also keeps the GFCI from tripping

  8. Discoveries thus far • Eaton’s studies found that placing ferrite beads on the lines between the GFCIs and the Meter solves the problem • However, connecting the GFCIs to a separate power supply has no effect

  9. Inferences • Direct interaction with differential transformer or RF transmission in the internal wiring are not the cause • Most likely the faulty tripping is caused by magnetic coupling with the hot line or the hot conductor in the GFCI

  10. Further avenues to explore • What is the strength of the magnetic field coming directly off the wire • Does the placing of the ferrite bead affect the impact of the ferrite bead on the fault • What is the threshold voltage of at which the differential transformers sends the trip signal

  11. Questions?

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