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

Volume

24

Issue

4

fYear

1989

fDate

8/1/1989 12:00:00 AM

Firstpage

641

Lastpage

647

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/Hz^1/2. 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;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.34199

Filename

34199