SU1513532A1 - Current measuring device - Google Patents

Abstract

This invention relates to electrical engineering and is intended to measure high frequency currents. The purpose of the invention is to expand the frequency range of measurements and increase the accuracy of measurements by improving the alignment of the device with a line in a wide frequency range. An insulating sleeve 3 is placed in the housing 1 of the device, in the central hole of which a rod 4 is placed, which acts as the primary winding of the transformer. In the middle part of the rod there is a thickened section 5 with an annular groove 6 made therein. In the annular groove 7 of the sleeve 3 there is a secondary winding 8 of the first transformer, the terminals 9 and 10 of which are connected to the housing 1. The primary winding of the second transformer is performed by a pair of terminals 10, magnetically connected with the secondary winding 12. Due to the annular groove 6, the center conductor is matched with the shielding winding of the first transformer. In this case, no jumps of the wave resistance and, accordingly, reflections of the high-frequency signal occur in the line. 2 Il.

Description

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6. In the annular groove 7 of the sleeve 3 is placed the secondary winding 8 of the first transformer, outputs 9 and 1.0 of which are connected to the housing 1. Functions of the primary winding of the second transformer are provided by a pair of terminals 10 that are magnetically connected with the secondary winding 12. Due to the ring groove

The invention relates to electrical measurements and can be used to measure high frequency currents in a wide range.

The purpose of the invention is to expand the frequency range of measurements and increase the accuracy of measurements by improving the coordination of the device operation with a line in a wide range of frequencies.

FIG. 1 shows a device for measuring current, a section; in fig. 2 is a section A-A in FIG. 1.

The device for measuring the current contains a housing 1 and a crown 2. In the housing 1 there is an insulating sleeve 3, in the central hole of which the rod 4 is still, the important role of the primary winding of the first transformer, in the middle part of which there is a thickened section 5 s An annular groove 6 filled in therein. In the annular groove 7 of the sleeve 3 there is a secondary winding 8 of the first transformer, the terminals 9 and 10 of which are connected to the housing 1. The number of turns of the secondary winding 8 of the first transformer is chosen current which does not exceed 1.2 A, and the conditions of the optimal distance between the turns of the coil to provide shielding properties. This winding is divided into two sections with an equal number of turns, the winding directions in the sections being opposite. One pair of terminals 9 of these sections is connected to housing 1, while the other pair of terminals 10 is interconnected.

In the lower part of the housing 1 and the rollers 2, cavities are formed that form in the assembled device a chamber 11 in which the secondary winding 12 of the second transformer, the primary winding of which is performed by a pair of terminals 10, is placed, through the passage window of the second transformer connecting to the housing 1.

6, the center conductor is matched to the shielding winding of the first transformer. In this case, no jumps of the wave resistance and, accordingly, reflections of the high-frequency signal occur in the line. 2 Il.

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The secondary winding 12 of the second transformer is made similar to the secondary winding 8 of the first transformer and its. both pairs of terminals 13 are connected to the conversion element of the output signal 14.

At both ends of the rod 4 there are slots 15 and 16 for connection to the measured line. An annular gasket 17 is put on the annular groove 6, which consists of two identical parts for the convenience of installing it on the annular groove 6.

A current measuring device operates in the following manner. A current measured by a device which induces a current in the secondary winding 8 of the first transformer flows through the primary winding 4, which is the central core of the coaxial line. One of the terminals 10 of the first transformer is passed through the passage window of the second transformer, and the current flowing through the secondary winding 8 of the first transformer and causing the induced current in the secondary winding 12 of the second transformer is measured by the conversion element 14.

The device for measuring current is implemented in the form of a segment of a coaxial line. The distance from the central core to the screen is conditioned by the formula

Z 1

1.5,

where g

Ze d

d

 line impedance

-diameter screen;

- diameter of the central core; 6 - dielectric constant.

Since both sections of the secondary winding of the first transformer are closed to housing 1, it becomes possible to use its shielding properties.

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Claims (1)

Formula of the invention, A device for measuring current, an output signal element, a housing, inside of which are two cascade-connected current transformers, each of which is made on toroidal magnetic circuits with primary and secondary windings, the primary winding of the first current transformer made in the form of a central rod, and its secondary winding is made in the form of two identical sections included in the opposite direction, one pair of terminals of which is directly connected to the housing, and the other is diametrically divided. the put pair of terminals is connected to the housing through the passage window of the second current transformer, thereby forming the primary winding of the second current transformer, the secondary winding of which is located on the magnetic circuit and connected to the converting element of the output signal, characterized in that, in order to expand the frequency range of measurements and improve accuracy measurements by improving the coordination of the operation of the device with the line in a wide range of frequencies, the Central core of the primary winding of the first transformer contains a thick section with a matching annular groove, and the specified thickened section is located in the plane of the toroidal coil of the secondary winding of the first current transformer.