SU1725349A1 - High-potential transformer-rectifier module - Google Patents

Abstract

The invention can be applied in electrical engineering, in particular in alternating voltage to high constant voltage converters used in high voltage power sources. The device solves the problem of improving the weight and dimensions and increasing the electrical strength of the structure. The high-potential transformer-rectifying module contains a magnetic core 1, on the rods of which primary windings 3 and a monosection secondary winding 4 are located. oriented in the opposite direction along the axes of the magnetic cores. 2 hp ff, 4 ill. / 2 SL With VJ you SL from 4 h

Description

FIG. 2

The invention relates to a high voltage technique, in particular, to the conversion of an alternating voltage to a high constant, and can be used to create reliable small-sized sources of high rectified voltage.

Devices are known for producing a high rectified voltage, which include high voltage transformers containing a magnetic conductor, primary windings, multi-section secondary windings, sections of which are connected to the inputs of rectifying devices, and the outputs are interconnected and form a series circuit, Secondary winding sections with corresponding rectifying devices are placed on separate boards.

The disadvantage of the devices is a large number of boards, which leads to their significant weight and dimensions.

High-voltage devices are known, made in the form of a transformer containing a magnetic core, primary and secondary windings, rectifying devices, high-voltage cable, and the secondary windings, rectifying devices and part of the high-voltage cable have a common electrical insulation from a liquid dielectric in a sealed enclosure or from solid.

The disadvantages of these devices are increased dimensions and low electrical strength caused by the presence of complex structural elements, the non-optimal arrangement of rectifying devices. Also the disadvantage of these devices is the difficulties associated with the replacement of the high-voltage cable, or the lack of this possibility, as well as the difficulties of its sealing, determined by the physicochemical properties of the electrical insulating sheath (for example, limited operating temperature).

Closest to the proposed invention is a high-voltage transformer-rectifying module containing a right-angle magnetic core, primary windings on its rods, solid main electrical insulation, secondary winding of N sections, N rectifying devices located on parallel bases x, perpendicular cores

the magnetic circuit, and the sections are connected to the inputs of the corresponding rectifying devices, the outputs of which

interconnected and input and output high-voltage terminals.

The disadvantages of this device are increased weight and dimensions, low electrical strength and limited functionality.

Increased weight and dimensions are caused by the location of each section of the secondary winding and the rectifying device on separate bases, which leads to an increase in the thickness of the electrical insulation. In addition, low electrical insulation strength is caused by overheating from losses in the wires of the windings and in rectifying devices, the lack of cooling and the unevenness of the electric field, which leads to an increase in voltage in some places of the module and, as a result, to breakdown of electrical insulation.

Attenuation of at least one of the listed factors contributes to a multiple increase in the service life.

Measures to eliminate these drawbacks implemented in the prototype, namely, increasing the diameters of the wires, optimizing the number of turns of the windings and the geometry of the magnetic circuit, intensifying the removal of heat from the magnetic cores and the primary windings, are insufficient.

In addition, the placement of secondary winding sections and rectifying devices in close proximity to each other leads to their joint thermal effect on the insulation, its local overheating and, consequently, a decrease in the electrical strength of the module.

The purpose of the invention is to improve the mass-size parameters, increase the dielectric strength and enhance the functionality of the module.

This goal is achieved by the fact that in a high-potential transformer-rectifying module containing a rectangular magnetic core, the primary windings on its rods, solid main electrical insulation, the secondary winding of N sections, N rectifying devices located on parallel bases, perpendicular axes of the cores of the magnetic circuit, and the sections are connected to the inputs of the corresponding rectifying devices, the outputs of which are interconnected and with the input and output high-voltage terminals, secondary and the winding is placed on frames fixed between two bases, the high-voltage leads are made in the form of high-voltage connectors and are oriented in the opposite direction along the axes of the cores of the magnetic core, with each pin rigidly fixed on one of the bases and crossing the plane of the other winding and high-voltage terminals form a single rigid structure. In addition, both bases are made of heat-conducting dielectric, and the gaps between the elements of the rectifying device and the base are filled with heat-conducting material. The rectifying devices are located in an area bounded by the cross-section contours of the secondary winding.

As an embodiment of the module, the high-voltage output terminal is made in the form of a pipe made of electrically insulating material, in which all output conductors under different high potentials are laid, and the projecting part of the said pipe has a length that excludes the possibility of surface overlap.

In the described high-potential transformer-rectifying module, high-voltage connectors made of electrical insulating material (for example, PA 6 polyamide) are used, which has high electrical strength and good adhesion with hardened compounds, which are the main electrical insulation. The advantage of such connectors is that they exclude the installation of high-voltage cables that require sealing in the module directly by the compound, since the hot-cured compounds (EZK-9, UP-111-5-3, etc.) have a polymerization temperature of up to 150 ° C which the electrical insulation of the high-voltage cable does not withstand, and the cold-cured compounds (EZK-6, etc.) have a critical mass (several hundred grams), which is unacceptable when creating high-power high-potential modules (several kW) insulation material (several kg).

FIG. 1 shows the module, a general view; in fig. 2 - the same, longitudinal section; in fig. 3 - the same cross section; in fig. 4-wiring diagram of the proposed device.

The module is made in the form of a transformer containing a magnetic core 1, having rods 2, primary windings 3, a multisection secondary winding 4 consisting of sections, rectifying devices 5, a solid main electrical

insulation 6, heat-conducting electrically insulating bases 7, equipotential elements 8, high-voltage terminals 9, frame for accommodating the secondary winding

ten.

On the electrical circuit of the device proposed, the primary windings are marked through W01, W02, the Wi-W2 - the secondary winding sections BI-BN - are rectifying

0 devices, 1-4 - low-voltage outputs of the primary windings, 5 and 6 - input and output high-voltage outputs, respectively.

The module works as follows

5 A low alternating voltage is applied to the primary windings, which is raised by the secondary winding, rectified by rectifying devices and fed to high-voltage leads.

0 The proposed high-potential transformer-rectifying module ensures reliable and stable operation in all operating modes over a wide range of ambient temperatures.

Claims (3)

1. High potential transformer-rectifying module containing a rectangular magnetic core, primary windings on its rods, solid main electrical insulation, secondary winding of N sections, N 5 rectifying devices placed on parallel bases perpendicular to the axes of the cores of the magnetic conductor, with sections connected to the inputs of the corresponding rectifying devices 0 whose outputs are interconnected and with the input and output high-voltage leads, characterized in that, in order to improve the weight and size parameters and increase the electrical strength, it has a frame fixed between the two bases on which the secondary winding is placed, high-voltage leads are made in the form of high-voltage connectors and oriented 0 in the opposite direction along the axes of the magnetic core rods, with each pin being rigidly fixed on one of the bases and crossing the plane of the other base, with both the bases, the secondary winding, and the high-voltage leads forming a single rigid structure. 2, Module pop. 1, characterized in that both bases are made of heat-conducting dielectric, and the gaps between the elements of the rectifying device and the base are filled with heat-conducting material. 3. The module according to claim. Characterized in that the rectifier The devices are located in an area bounded by the cross-sections of the secondary windings. Fi.Z Fy 06