HV Field Testing and CCVT Re-verification December 2013

© 2013 Quanta Technology LLCPage 2 CVT Calibration and Re-Verification Circuit

© 2013 Quanta Technology LLCPage 3 CCVT or PT Calibration CCVTs or PT under test Ref. VTs connecting to HV line (live) Electronic comparator (bridge)

© 2013 Quanta Technology LLCPage 4 CCVT or PT Accuracy Re-verification Report Test report provides: 1.Ratio Error and RCF (Ratio Correction Factor) 2.Phase Error, and 3.TCF (Transformer Correction Factor) for the CCVT under test at the real operating voltage, per IEEE Std. C57.13 and C Electronic Comparator (bridge) with < 0.05% uncertainty traceable to NIST

Extract from Current/Voltage Sensors for Precise Measurements of Power Quality in Distribution Systems for the Smart Grid Eddy So and Farnoosh Rahmatian National Research Council Canada and Quanta Technology IEEE PES General Meeting, Vancouver, BC July 23, 2013 © Quanta Technology Canada ULC

Ease of Installation and Use Safety Light weight Easy to connect to HV line – High-impedance – Isolation Integrated data processing Rugged design (environmental elements) © Quanta Technology Canada ULC

Traceability Unbroken chain of measurements Compliance with regulations and standards On site calibration / verification of sensors – The accuracy requirements of the reference system – Uncertainty < 1/4 devices being verified in the field Documentation © Quanta Technology Canada ULC

Calibration and Traceability Traceability – Unbroken Chain of Measurements Tracing Back to National and/or International Standards (e.g., NIST) – Uncertainty analysis and certification International Standard National Standard – National Labs, e.g., NIST, NRC Regional or Portable References Device Under Test DUT 1 DUT 2DUT n Ref. ARef. B NIST Reference Std DUT 3 Ref. C NRC Reference Std International Reference Std Example: 0.2 – 1.0% ppm ppm DUT 4 © Quanta Technology Canada ULC

Calibration Circuit for OVT with Rated Voltage Output of 4 V 9 © Quanta Technology Canada ULC

Calibration Circuit for OVT (OPT) © Quanta Technology Canada ULC

Calibration Results for OVT (OPT) Ratio Error © Quanta Technology Canada ULC

Calibration Results for OVT (or OPT) Phase Error © Quanta Technology Canada ULC

Live-line Connections of OVT Advantage OVT – Excitation Current about 1 mA regardless of rated voltage, as compared to conventional PT excitation current of about 100 mA to 1 A (depending on rated voltage). Can be connected live © Quanta Technology Canada ULC

OVT Qualification Conclusion NRC (NIST) Test Results indicate the suitability of OVT to be used as reference Instrument Transformers for live-line on-site calibrations of HV Revenue Metering Systems of accuracy class 0.2 – 0.3, including HV PMU Systems which usually are of accuracy class 0.5 – 1.0. Because of its linearity, certain accuracy and performance parameters can be extended over harmonics and frequency © Quanta Technology Canada ULC