Effects of smart meter RF on GFCI units
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Effects of smart meter RF on GFCI units
Caroline StormSponsored by: Dr. David Wetz, Simon
Donahue
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Introduction to GFCIs
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Introduction to Smart Meters
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Introduction to GFCIs
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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
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HypothesisThe 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 lineMagnetic coupling with the differential transformerRF transmission being picked by internal wiring in
the smart meterMagnetic field effecting the solenoid
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Discoveries thus farTwo 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
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Discoveries thus farEaton’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
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InferencesDirect 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
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Further avenues to exploreWhat 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
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Questions?