A 1000 A 20 KV/25 KHZ-500 KHZ VOLT-AMPERE-WATTMETER FOR LOADS WITH POWER-FACTORS FROM 0.001 TO 1.00/

Many industrial processes and scientific experiments utilize large amo unts of ac power at frequencies from 3 kHz to 500 kHz. The phase angle and the impedances of these loads often vary over a wide range, This paper describes an instrument to provide an accurate measurement of cu rrents (1 A to 1000 A), voltages (100 V to 20 kV), and powers (100 W t o 20 MW) over the frequency range from 25 kHz to 500 kHz, It deals wit h loads having power factors down to nearly zero and with load impedan ces from 10 Ohm to 20 k Ohm. The paper contains practical details of b oth the design and the calibration of the front-end voltage and curren t transducers. The characteristics of a nearly ideal broadband current transducer are presented, Overall instrument calibration, verificatio n and traceability problems are considered in detail.