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Geoff Bennett Miles Hancock Drew Jennings. Novel Current Sensor Schneider Electric . General Description. Problem Description Novel Current Sensor Transmission Line Application Design Specifications Coreless Isolated Detection Deliverables AC Current Sensor Sensor Designs

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## Novel Current Sensor Schneider Electric

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**Geoff Bennett Miles Hancock Drew Jennings**Novel Current Sensor Schneider Electric**General Description**• Problem Description • Novel Current Sensor • Transmission Line Application • Design Specifications • Coreless • Isolated Detection • Deliverables • AC Current Sensor • Sensor Designs • Testing Data**Literature Review**Current Technologies Rogowski Coil Hall Effect Sensor**GMR Technology**• Emerging Technology • Used in Hard Drives • Recently Commercially Available • Proven in other applications • So How Does it work?**GMR Technology**Electron Spin direction changes in the direction of the applied magnetic field**GMR Technology**http://mrsec.wisc.edu/Edetc/IPSE/educators/activities/gmr.html**GMR Technology**R1(GMR)**Conceptual Design**• EMI Shielding • Physical layout of GMR’s • GMR biasing with current trace**1**2 3 4 5 7 8 a1 a2 a3 a4 b1 8 b3 b4 b2 6 1 2 5 3 4 7 b2 6 a2 a3 a4 b1 b3 a1 1 2 3 4 5 6 b4 8 a1 a2 a3 a4 b1 b2 b3 b4 7 GMR GMR GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Conductor runs on top of GMR's. This is designated by the doted lines. Current Bias**Conceptual Design**• True RMS calculation • Real-time digital filtering • Hysteresis calibration Digital Signal Processing**Hysteresis curve**http://www.ifw-dresden.de/institutes/imw/sections/26/magnetic-films-folder/hard-magnetic-films/nd-fe-b-films**Rogowski Coil**Hall Effect MEMS Bill of Materials Part Ordering GMR Faraday Effect Radical Ideas Timeline Physical Design Filter Design Noise Correct Magnetometers Signal Analysis Idea Matrix Miles Hancock Geoff Bennett Drew Jennings**Development Costs: $789.01**Production Cost: $256.63**Conclusions**• Why is it a good design? • Cost, Safety, Size, Installation, Accuracy • Additional Functionality • Power Calculation • Very High Current Systems Production Cost: $256.63**Current prototype**GMR Applied Field**1**2 3 4 5 7 8 a1 a2 a3 a4 b1 8 b3 b4 b2 6 1 2 5 3 4 7 b2 6 a2 a3 a4 b1 b3 a1 1 2 3 4 5 6 b4 8 a1 a2 a3 a4 b1 b2 b3 b4 7 GMR GMR GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Conductor runs on top of GMR's. This is designated by the doted lines. Current Bias**1**2 3 4 5 7 8 a1 a2 a3 a4 b1 8 b3 b4 b2 6 1 2 5 3 4 7 b2 6 a2 a3 a4 b1 b3 a1 1 2 3 4 5 6 b4 8 a1 a2 a3 a4 b1 b2 b3 b4 7 GMR GMR GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Flux Collector Flux Collector GMR Conductor runs on top of GMR's. This is designated by the doted lines. Current Bias

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