RU2092971C1 - High voltage shaping line for producing pulses of nanosecond and microsecond range of almost rectangular waveform - Google Patents

Abstract

FIELD: high-voltage pulse engineering. SUBSTANCE: shaping line has two flat buses and capacitor stacks placed inbetween and made in the form of series-connected spirally wound capacitor coils. Coils are interconnected within stack by placing leads of maximum width in center of plates or by using several pairs of leads in each coil. Length of capacitor plates is found from condition

, where τ_p is pulse length, s: n is number of coil stacks; μ_o is absolute magnetic constant, H/m; ε is dielectric constant of coil insulation, F/m. EFFECT: improved waveform of pulse approaching rectangular one. 1 dwg

Description

 The invention relates to electrical engineering, namely to high-voltage pulse technology, and can be used to create high-power generating lines (PL) of high voltage to obtain pulses of the nano and microsecond range in shape, close to rectangular, at a coordinated low-resistance load.

 Known designs of such lines with distributed parameters, which are coaxial or flat systems of electrodes of the required size, using as a dielectric fluid (deionized water, mineral oils, etc.) [1] or solid dielectrics [Capacitive storage and pulsed magnetic field generators, developed at the BINP SB RAS / A. M. Iskoldsky, V. A. Kapitonov, V. M. Lagunov and before. In the book. Electrophysical apparatus and electrical insulation. M. Energia, 1970] However, these lines, designed for voltages of up to several million volts, using liquid dielectrics have significant overall dimensions. The use of detonated water as a dielectric requires an additional power source. The use of solid dielectrics in lines of voltage of 100 kV and more requires the use of gradient screens or connected sections to increase the working tension, which causes extremely great structural difficulties.

 The closest analogue is the design of the forming line used in the generator of high-voltage nanosecond pulses [2] consisting of strip lines placed in an insulating casing between the conductive buses. Each line is made in the form of two metal plates surrounded by insulation, the opposite plates are located on opposite sides of the line, the lines are superimposed on one another, forming packets. Opposite tires are superimposed on a number of packages. The forming line, made in this way, consists of strip lines with significant inductance and active resistance of the plates.

 As was established by special computer calculations and direct experiments, parameters such as distributed inductance and active resistance of strips of strip line sections adversely affect the shape of the pulse, leading to a significant peak drop, an increase in the length of the front and the length of the pulse drop.

где τ_и длительность высоковольтного импульса, с; n количество пакетов последовательно соединенных спирально намотанных секций конденсаторов, μ₀ абсолютная магнитная постоянная, Гн/м; ε диэлектрическая проницаемость диэлектрика секций, Ф/м. Соединение секций в пакете осуществляется путем закладывания максимально широких выводов 3 на середину обкладок или применением нескольких пар выводов в каждой секции. Такое соединение секций приводит к значительному уменьшению индуктивности, сопротивлению обкладок и уменьшению отрицательного влияния этих величин на форму импульса. Основным индуктивным элементом в предлагаемой конструкции являются проводящие шины, по ширине равные ширине обкладок секций, выполненные для увеличения индуктивности в виде двух плоских шин с поперечными разрезами 4. Пакеты конденсаторов секций рассчитаны на полное напряжение линии и присоединяются поочередно к противоположным кромкам соответствующих плоских шин равномерно по всей их длине.The drawing shows the design of the forming line of high voltage. In the proposed design, the forming line is made in the form of two flat tires, between which are placed packages of capacitive elements 1 made in the form of serially connected spirally wound sections of capacitors 2 made by conventional technology for power capacitors. The length of the plates l, at which the sections lose the properties of the line with the distribution of parameters and approach the lumped capacity, is determined from the condition:

where τ _{and the} duration of the high voltage pulse, s; n is the number of packets of serially connected spirally wound capacitor sections, μ _{0 is the} absolute magnetic constant, GN / m; ε dielectric constant of the dielectric sections, f / m. The connection of sections in the package is carried out by laying the widest conclusions 3 in the middle of the plates or by using several pairs of terminals in each section. Such a connection of the sections leads to a significant decrease in inductance, the resistance of the plates and a decrease in the negative effect of these quantities on the shape of the pulse. The main inductive element in the proposed design is conductive busbars, equal in width to the width of the section plates, made to increase the inductance in the form of two flat tires with transverse sections 4. Packages of section capacitors are designed for the total line voltage and are connected alternately to the opposite edges of the respective flat tires uniformly their entire length.

 Such a PL design significantly improves the shape of the pulse at a matched load, bringing it closer to a rectangular shape reduces the duration of the leading and trailing edges and decay on the expected flat part.

Claims (1)

The forming line of high-voltage pulses, containing series-connected LC-links with an inductive element made in the form of two flat buses, and packages of capacitive elements, which are located between the flat tires and connected to them by the corresponding terminals, characterized in that the flat buses are provided with transverse slots, and the capacitive elements in each package are made in the form of serially connected spiral wound sections of capacitors, the length l of the plates of which is selected from the condition

where τ _and is the duration of the high voltage pulse, s;
n the number of packets of serially connected spirally wound capacitor sections;
μ _o is the absolute magnetic constant, GN / m;
ε is the dielectric constant of the dielectric sections, f / m,
and the findings of the packages of series-connected spirally wound capacitor sections are connected alternately to the opposite edges of the respective flat buses uniformly over their entire length.