Title :
A 100000-ampere series high precision on-site measurement calibration device for heavy direct current
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A 100000-A series high-precision on-site calibration device for measuring high direct current of a magnetic modulation comparator type is presented. The device can be used in an industrial system for online calibration and measurement. Testing of the comparator shows that its accuracy for measuring current ratio is 5×10.5 and for measuring voltage with a standard resistance is 3×10.4 (on-site calibration), 5×10.4 (accurate measurement), or 1×10.3 (on-site measurement). The error in repeatability for measuring open-loop cores is 2×10.5, and its antimagnetic ability with respect to the external magnetic field is 1×10.2 Tesla. The author discusses the principle of operation and characteristics of the comparator, the antimagnetic principle, and the analysis of comparator errors
Keywords :
calibration; comparators (circuits); electric current measurement; magnetic devices; 100000 A; antimagnetic principle; electric current measurement; heavy direct current; magnetic modulation comparator; measurement errors; on-site measurement; online calibration; Calibration; Current measurement; Electrical resistance measurement; Magnetic cores; Magnetic devices; Magnetic field measurement; Magnetic modulators; Measurement standards; Testing; Voltage measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1989. IMTC-89. Conference Record., 6th IEEE
Conference_Location :
Washington, DC
DOI :
10.1109/IMTC.1989.36827