Title :
Low-noise wide-band amplification system for acquiring prebreakdown current pulses in liquid dielectrics
Author :
Blalock, T.V. ; Wintenberg, A.L. ; Pace, M.O.
Author_Institution :
Dept. of Electr. & Comput. Eng., Tennessee Univ., Knoxville, TN, USA
fDate :
8/1/1989 12:00:00 AM
Abstract :
A low-noise wideband amplification system consisting of a preamplifier with input protection circuit and an amplifier were developed for measuring the prebreakdown currents in liquid dielectrics. The system design considerations and experimental results are presented. The preamplifier was voltage-sensitive with a voltage gain of 154 V/V, and had a bandwidth of 56 MHz and an equivalent noise voltage spectral density of 0.93 nV/Hz1/2. The amplifier had a voltage gain of about 12 and a bandwidth of 58 MHz and was capable of driving |2| V across two paralleled 50 Ω loads. The overall system had a gain of 92400 V/A when loaded with 50 Ω, and it had a minimum detectable current of 1.9 μA for an overall bandwidth of about 29 MHz
Keywords :
dielectric measurement; dielectric properties of liquids and solutions; electric breakdown of liquids; wideband amplifiers; 1.9 muA; 29 MHz; 56 MHz; 58 MHz; amplifier; bandwidth; equivalent noise voltage spectral density; input protection circuit; liquid dielectrics; low-noise wideband amplification system; minimum detectable current; preamplifier; prebreakdown current pulses; voltage gain; Bandwidth; Broadband amplifiers; Circuits; Current measurement; Dielectric liquids; Low-noise amplifiers; Preamplifiers; Protection; Voltage; Wideband;
Journal_Title :
Electrical Insulation, IEEE Transactions on
