RU2577532C1 - Multichannel rail discharger - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: multichannel rail discharger contains a tight dielectric casing (1), made in the form of a single in the cross-section structure, with installed in it parallel to each other long main electrodes (2) and installed between them ignition electrodes (4) with a cone tip located along the axis perpendicular to axes of the main electrodes (2), and made isolated from each other. Wherein to the central ignition electrode (4) a union of gas supply (8) of the discharger is connected, to each main electrode (2) a charging electric circuit of positive and negative polarity is connected, and to the ignition electrodes (4) a starting electric circuit is connected.

EFFECT: creation of the low inductance multichannel rail discharger with two polarity charging, ensuring reduced losses in an oscillating circuit of the capacitive storage on an active resistor of the discharger, and an increased impact stress of the storage.

3 cl, 5 dwg

Description

The invention relates to high-voltage high-current pulse technology, and in particular to high-current switching gas-filled rail-gap arresters.

Known multi-channel rail arrester described in the work of W.A. Ress et al. "Capacitor and rail-gap development for the atlas mashine marx modules", presented at the 10th international conference held in New Mexico, USA, in July 1995, pages 522-527, containing a sealed dielectric chamber, the main electrodes of the semi-cylindrical shape located in it and the control electrode installed between them with a pointed edge.

The disadvantage of this arrester is that the sealed dielectric discharge chamber is made in a rectangular cross-section of two parts connected by studs, and the control electrode in the form of a solid metal plate causes difficulties in the formation of a multi-channel discharge and worsens controllability during operation of the device.

The closest and selected as a prototype is a multi-channel rail arrester described in RF patent No. 2247453 under the name "Multi-channel rail arrester", published on 02.27.2005, IPC Н01Т 2/02, Н01Т 4/10, containing a sealed dielectric housing made in in the form of a single structure in the cross section, with the main electrodes installed in it parallel to each other and the ignition electrode installed between them with a cone-shaped tip.

The disadvantages of this technical solution are: the limitation of the charging voltage of 100 kV and unipolar charging, the presence of external electrodes, the complexity of manufacturing and the presence of an external closed fiberglass band.

The objective of the invention is to provide a multi-channel rail arrester of a low-inductance controlled arrester with bipolar charging.

The technical result consists in the fact that it was possible to reduce the losses in the oscillatory circuit of the capacitive storage device at the active resistance of the spark gap and to increase the shock voltage of the storage device by increasing the charging voltage.

This is achieved by the fact that a multichannel rail arrester containing a sealed dielectric casing, made in the form of a single cross-sectional structure, with main electrodes installed in it parallel to each other and installed between them an ignition electrode with a conical tip, according to the invention, is equipped with at least three firing electrodes mounted on an axis perpendicular to the axes of the main electrodes and made insulated relative to each other, while to the central at the ignition electrode, a gas filling nozzle of the spark gap is connected, a charging electric circuit of positive and negative polarity is connected to each main electrode, and a trigger electric circuit is connected to the ignition electrodes.

In addition, the central ignition electrode is made with an inlet.

In addition, the starting electrical circuit is connected in oil insulation.

The presence in the claimed invention features that distinguish it from the prototype, allows us to consider it appropriate to the condition of "novelty."

New features (a multi-channel rail arrester is equipped with at least three ignition electrodes installed along an axis perpendicular to the axes of the main electrodes and made insulated relative to each other, while a gas filling of the arrester is connected to the central ignition electrode, and a charging electric is connected to each main electrode a chain of positive and negative polarity, and a starting electric circuit is connected to the ignition electrodes) are not identified in technical specifications eniyah similar purpose. On this basis, we can conclude that the claimed invention meets the condition of "inventive step".

The invention is illustrated in the following drawings.

In FIG. 1 shows the design of a multi-channel rail arrester;

In FIG. 2 shows the position of the ignition electrodes;

In FIG. 3 is a cross-sectional view of the structure of a multi-channel rail arrester;

In FIG. 4 shows an electrical schematic diagram of a voltage pulse generator (GIN) with two switching arrester;

In FIG. Figure 5 shows the dependence of the self-breakdown voltage on the gas pressure.

The following notation is introduced in the drawings:

1 - arrester housing,

2 - the main electrode,

3 - fluoroplastic dielectric sleeve,

4 - ignition electrode,

5 - ring fastening the front flange,

6 - hairpin,

7 - end flange,

8 - gas filling fitting,

9 - bus mounting electric cable,

10 - protective hemisphere,

C - capacitor IR-200-0.1,

FV - switching rail arrester,

L1 - GIN inductance to the load node,

Rnag - load resistance.

A multi-channel rail arrester consists of a sealed dielectric casing 1 (Fig. 1), on which two main electrodes 2 are mounted through fluoroplastic dielectric bushings 3. At an angle of 90 degrees to the main electrodes 2, three ignition electrodes 4 with a conical tip are mounted on one axis. At the ends of the arrester, through the special rings 5, the end flanges 7 are attached using pins 6. A gas filling fitting 8 is attached to the central ignition electrode 4 (Fig. 2 and Fig. 3), and an inlet for the working gas inlet is made in the body of the central ignition electrode 4 into the cavity of the spark gap to a certain pressure, for example, 0.6 MPa. On each electrode 2 and 4, a protective hemisphere 10 and a busbar for mounting the electric cable 9 are installed.

The work is as follows. The bipolar charging arrester operates on the principle of distortion of the electric field. The spark gap operates as follows: at the moment of charging capacitors C (Fig. 4) connected to the main electrodes 2, the conical tip of the ignition electrode 4 is located along the zero equipotential of the electric field and does not introduce any distortion into the distribution of the electric field inside the multichannel rail spark gap when feeding a firing pulse at the end of the firing electrode 4 there is a strong distortion of the electric field and an increase in tension, which leads to the appearance of streamers and breakdown of the discharge of the gap between the main electrodes 2 and the closure of the oscillation circuit via the inductance L1 and the load resistance Rload.

Concrete example

The main discharge gap is formed by two extended main electrodes 2 made of metal, such as brass, and can vary in the range from 21 mm to 29 mm using fluoroplastic dielectric bushings 3 and rubber seals of different thicknesses. After installing the main electrodes 2, the gap between them along the entire length is checked using a special template. Three conical ignition electrodes 4 of stainless steel are mounted on the fluoroplastic dielectric bushings 3 through rubber seals of different thicknesses. The distance from the edge of the ignition electrode 4 to the central axis of the arrester can vary from 15 to 18 mm, depending on the mode of operation.

As working gases, argon, SF6 gas, carbon dioxide or mixtures thereof can be used at a pressure of 0.2 to 0.6 MPa with preliminary evacuation and a tightness test with a pressure of 0.1 MPa of compressed air for 24 hours.

The invention is implemented and tested at the enterprise. Tests of eight experimental samples of the present invention showed sufficient mechanical (static and dynamic) structural strength of a multi-channel rail arrester. The average life of a multi-channel rail arrester before prevention is about 100 pulses. Life tests are ongoing. This invention allowed to create the design of a multi-channel rail arrester (inductive capacitive energy storage) for the megaampere class accelerator - RAPID-2, with a primary drive shock voltage of up to 800 kV and a diode load of 1 MB in order to create a powerful source of superhard x-ray radiation (SJR) . In FIG. Figure 5 shows a typical dependence of the self-breakdown voltage on the gas pressure and the controllability zone (shaded area).

The inventive device, a multi-channel rail arrester, allowed to create a design of a capacitive energy storage device with bipolar charging, to reduce losses in the oscillatory circuit of a capacitive storage device at the active resistance of the spark gap, and to increase the shock voltage of the storage device up to 800 kV. In addition, this multichannel rail arrester design allows you to create a voltage pulse generator (GIN) with bipolar charging and shock voltage up to 800 kV, withstanding a static voltage of 400 kV in oil insulation.

For the claimed invention, in the form described in the claims, the possibility of implementing the device and the ability to ensure the achievement of the perceived by the applicant technical result is confirmed. Therefore, the claimed invention meets the condition of "industrial applicability".

Claims (3)

1. A multichannel rail arrester containing a sealed dielectric housing made in the form of a single cross-sectional structure, with main electrodes installed in it parallel to each other and an ignition electrode with a cone shaped tip installed between them, characterized in that it is equipped with at least three ignition electrodes mounted on an axis perpendicular to the axes of the main electrodes and made insulated with respect to each other, and a multi-channel gas filling fitting Foot rail arrester, wherein each main electrode connected to the charging electric circuit of positive and negative polarity, and the electrodes connected to the igniter triggers the electrical circuit. 2. The multi-channel rail arrester according to claim 1, characterized in that the gas filling fitting of the arrester is connected to the central ignition electrode. 3. The multi-channel rail arrester according to claim 1, characterized in that an inlet is made in the body of the central ignition electrode.

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