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High-Precision Self-Calibrating Current Transformer With Stray Capacitances Control.

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Bibliographic Details
Title: High-Precision Self-Calibrating Current Transformer With Stray Capacitances Control.
Authors: Slomovitz, Daniel1 dslomovitz@ute.com.uy, Santos, Alejandro1, Sandler, Rogelio1 rogelio@sandler.com.uy, Barreto, Gabriela1
Source: IEEE Transactions on Instrumentation & Measurement. 2021, Vol. 70, p1-9. 9p.
Subjects: Stray currents, Current transformers (Instrument transformer), Electric capacity, Electronic equipment, Magnetic cores
Abstract: This article shows the design of a simple construction two-stage current transformer with ratios from 5 A:5 A to 2000 A:5 A. It can be self-calibrated. Primary windings are separated into sectors to allow series–parallel configurations. Beginning with 5 A:5 A-ratio self-calibration, the higher ranges relate their errors to this first one, considering parasitic effects. Stray capacitances are considered as the major source of error when changing the configuration of the primary winding. New methods to calculate and compensate them are proposed, and electronic devices are used to reduce ratio error and phase displacement to few $\mu \text{A}$ /A and $\mu $ rad. The participation of this transformer as the UTE standard in an international comparison confirmed the calculated performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This article shows the design of a simple construction two-stage current transformer with ratios from 5 A:5 A to 2000 A:5 A. It can be self-calibrated. Primary windings are separated into sectors to allow series–parallel configurations. Beginning with 5 A:5 A-ratio self-calibration, the higher ranges relate their errors to this first one, considering parasitic effects. Stray capacitances are considered as the major source of error when changing the configuration of the primary winding. New methods to calculate and compensate them are proposed, and electronic devices are used to reduce ratio error and phase displacement to few $\mu \text{A}$ /A and $\mu $ rad. The participation of this transformer as the UTE standard in an international comparison confirmed the calculated performance. [ABSTRACT FROM AUTHOR]
ISSN:00189456
DOI:10.1109/TIM.2020.3045840