Development of a High-Precision Calorimeter for Measuring Power Loss in Electrical Machines

Wenping Cao, K. J. Bradley, A. Ferrah

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This paper is concerned with the development of
a high-precision 30-kW (40-hp) calorimeter and is specifically
focused on how experimental errors resulting from calorimeter
design and operating procedures are eliminated or mitigated. A
complete calibration for the calorimetric system using a dc heater
is conducted, and two induction motors rated at 5.5 and 30 kW
(7 and 40 hp, respectively) are carefully tested both within and
outside of the calorimeter. Loss segregation is in accordance with
the IEEE 112 method B. Experimental results for the comparison
of calorimetric and input–output methods clearly confirm the
effectiveness of the calorimeter in terms of accurate power loss
measurement. The accuracy of the calorimeter is approximately
5.6 W in the measurement of power loss of up to 4.5 kW with a
resolution of 0.1 W
Original languageEnglish
Pages (from-to)570-577
JournalIEEE Transactions on Instrumentation and Measurement
Issue number3
Publication statusPublished - 1 Mar 2009

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