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A Two‐Stage Inductive Voltage Divider Using a Special Winding Method
Author(s) -
Tsutsumi Shintaro
Publication year - 2014
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22515
Subject(s) - voltage , shields , electrical impedance , electrical engineering , stage (stratigraphy) , materials science , acoustics , mechanical engineering , engineering , physics , electromagnetic shielding , paleontology , biology
SUMMARY Inductive voltage dividers (IVDs) are widely used in the field of ac measurements, such as impedance measurements at audio frequencies. The two‐stage guarded IVD was developed by D.N. Homan and T.L. Zapf about 40 years ago. However, it is not easy to construct a two‐stage guarded IVD. Therefore, we have developed a two‐stage IVD using a special winding method without guarding by magnetic and electrical shields. To reduce the admittances of the winding wires, corrugated polypropylene board is used for the new two‐stage IVD. In addition, the ratio winding and excitation winding are wound toroidally around two FINEMET ring cores using PEW flat cable 0.7 mm in diameter. As a result, the in‐phase ratio errors are within ± 6.1 × 10 −8 of the input at frequencies of 1 kHz or below. In this report, the winding methods and measurement results of the new two‐stage IVD are described.