501 ISSN 0020-4412, Instruments and Experimental Techniques, 2018, Vol. 61, No. 4, pp. 501–505. © Pleiades Publishing, Ltd., 2018. Original Russian Text © M.I. Baranov, V.V. Kniaziev, S.V. Rudakov, 2018, published in Pribory i Tekhnika Eksperimenta, 2018, No. 4, pp. 41–46. The Coaxial Shunt for Measurement of Current Pulses of Artificial Lightning with the Amplitude up to ±220 kA 1 M. I. Baranov a, *, V. V. Kniaziev a, **, S. V. Rudakov b, *** a Research and Design Institute “Molniya” of National Technical University “Kharkov Polytechnic Institute,” Kharkov, 61013 Ukraine b National University of Civil Protection of Ukraine, Kharkov, 61023 Ukraine *e-mail: baranovmi@kpi.kharkov.ua **e-mail: knyaz2@i.ua ***e-mail: serg73@i.ua Received August 2, 2017; in final form, September 15, 2017 Abstract—The improved construction of the coaxial shunt SC-300M intended for measurement of decaying sine and aperiodic pulses of artificial lightning current with amplitudes up to ±220 kA is described. The results of tests of the instrument shunt in the high-current discharging circuit of power high-voltage generator of lightning current (g.l.c.) under pulsed A-component with the first amplitude −198 kA corresponding to time ≈35 μs and an action integral of the simulated pulse of current of lightning discharge equal to ≈2.38 × 10 6 J/Ω are presented. The quantity of electricity under single action on the shunt by a current pulse of artificial light- ning with logarithmic decrement of oscillations ≈2.06 that passed through the current-carrying elements of its construction was ≈−9.9 C. It was shown that, simultaneously with registration of pulsed A-component of lightning current, the shunt, owing to using of a matching voltage divider at the end of its cable communica- tion line, allows also to measure normalized amplitude-time parameters of aperiodic shortened long-term C*-component of artificial lightning current (−568 A; ≈5 ms; ≈18 ms; −16 C) that was being formed in the discharging circuit of the generator. DOI: 10.1134/S0020441218030156 INTRODUCTION During testing of objects of airspace equipment for lightning immunity according to requirements of codes USA SAE ARP 5412:2013 [1] and SAE ARP 5416:2013 [2], power high-voltage generators of light- ning current (l.c.g) [3] based, as a rule, on capacitive energy storages and reproducing, at corresponding electrical loads of tested objects, normalized ampli- tude-time parameters (a.t.p.) of pulsed A-, intermedi- ate B-, long-term C-, shortened long-term C*- and repeated pulsed D- components of artificial lightning current are used. To control and record a.t.p of the above-mentioned components of artificial lightning current in investigated electrical circuits of objects tested for lightning immunity, corresponding measur- ing devices (m.d.) are required. One of such obligatory m.d. for high-voltage test laboratories of the world is an instrument shunt intended, in combination with digital storage oscillo- scopes (d.s.o.), for determination of a.t.p. of the above-mentioned components of artificial lightning current generated by power l.c.g. And it is reasonable that personnel that service power l.c.g. (when electri- cal energy stored in its high-voltage capacitor banks has an order of 1 MJ [3]), for convenience of operation and to provide high indicators of reliability and accu- racy of measurements required in such tests for light- ning immunity of above-mentioned equipment, should have one instrument shunt placed in the dis- charging circuit of the l.c.g. and capable to measure, simultaneously in several channels of cable communi- cation lines, decaying sine and aperiodic pulses of cur- rent of micro- and millisecond duration (for example, A-, B-, and C-components of lightning current) with amplitudes of hundreds kiloamperes to tens amperes, that are being formed in one electrical load and follow each after other. Such an engineering and technical task was par- tially solved in R&D “Molniya” of NTU “KhPI” in 2007 when creating one of types of power l.c.g. according to the requirements of [1, 2] by way of use of a coaxial shunt of SC-300 type [3] built on the basis of high-resistance measuring manganin disk with the thickness h d = 0.3 mm and the external diameter D e = τ * C 1 The article was translated by the authors. ELECTRONICS AND RADIO ENGINEERING