Abstract
Conventional forms of multi-range current transformers with a rated output of 5 or 10 va (volt-amperes) cannot be employed for operation of standard moving-coil milliammeter ink recorders which require about 1.5 mw (milliwatts) for full-scale deflection. Recently developed a-c and d-c types of miniaturized current transformers using cores of thin molybdenum-permalloy tape and special construction (extremely small cross-sectional area of the core and very large number of turns of the secondary winding) make multirange operation of such recorders possible.
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Schedule a callMore From: Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics
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