SU1242835A1 - Device for contactless measuring a.c.voltages in conductors - Google Patents

Abstract

The invention can be used to monitor the state of various electrical equipment, electrical wiring circuits; lived cables, etc. The purpose of the invention is to improve the measurement accuracy. When entering into the window 3 of the conductor, its outer surface slides along the springs 7, pushing them apart to the diameter of the cable. The wedge-shaped liners 8, fastened at the free ends of the springs, move when the springs are expanded perpendicularly parallel to the sides of the window. In addition, slipping along the surface of the large legs of the inserts 8, they provide a predetermined distance from the outer surface of the conductor to the measuring electrode 1. When a conductor is inserted into the window 3 of a larger diameter, the spring 7 pushes the coolant inserts 8 and 8 apart from the longitudinal axis of the window and The distance from the outer surface of the conductor to the measuring electrode 1 is reduced. In this case, the total distance from the conductor to the measuring electrode 1 remains unchanged, thereby achieving the desired goal. 3 W1. about .and (/) phi2.1

Description

The invention relates to an electrical measuring technology and can be used to monitor the state of various electrical equipment, electrical wiring circuits, cable cores and insulated wires without disturbing the outer insulation layers.

The goal of the invention is to increase the accuracy of measurements by keeping the device capacity unchanged when measuring electrical voltages on conductors of different diameters.

FIG. 1 shows schematically the construction of the device; in fig. 2 and 3 - the principle of its work.

The device contains a measuring electrode 1 in a case of insulating material 2, a window 3 for introducing a conductor, a capacitor 4 connected to the input of the amplifier 5, the output of which is connected to the display device 6. In the window 3, made in the form of a groove and intended to enter the conductor, are placed flat springs 7 and wedge-shaped inserts 8.

The device works as follows.

When entering into the window 3 of the conductor 9, the outer surface of the conductor slides along the springs 7, pushing them up to the diameter of the cable (conductor) -2 d /. The wedge-shaped inserts 8, fixed at the free ends of the springs, move when the springs move apart perpendicularly parallel to the sides of the groove, slipping along the surface of the large legs of the liners, thereby providing the distance, d, from the outer surface of the conductor to the measuring electrode 1. When a larger diameter (2 d ,, fig. 3) is inserted into the groove of the conductor, the springs 7 move the wedge-shaped inserts apart to a greater distance relative to the longitudinal axis of the groove, and the distance from the outer surface of the conductor to the measuring electrode 1 decreases to the value dj.

The total distance from the center. The conductor 9 of the conductor 9 to the measuring electrode 1 remains unchanged, i.e. d, const.

In accordance with the expression

WITH

d, / e,

,

five

five

0

five

0

five

O

d, and f. 0

where o is equivalent to the area of the electrodes;

thickness and dielectric constant of conductor insulation;

d and -. the thickness and dielectric constant of the dielectric layer between the measuring electrodes and the surface of the conductor,

working capacity From the device also

remains constant and independent of.

conductor diameter.

Claims (1)

Invention Formula A device for non-contact measurement of alternating electrical voltages in conductors, containing an oly-type material housing with a measuring electrode fixed in the working part, a low dielectric dielectric layer, a conductor input window, a measuring electrode connected to a capacitor connected in parallel to the amplifier input The output of which is connected to the display device, characterized in that, in order to increase the measurement accuracy, in the window for the input of the conductor, made in the form of There are two flat pr-dinners and two wedge-shaped inserts, with flat springs mounted on different sides of the groove on different sides of the groove, at an acute angle to the parallel sides of the groove, the ends of the flat springs are fixed; the groove, wedge-shaped inserts mounted at the base of the groove are attached to the free ends of the springs, the larger leg of each liner is perpendicular to the parallel sides of the groove, the smaller leg is parallel to it, and the measuring electrode is separated from the wedge Inserts with a dielectric layer with a low dielectric constant. FIG. 2 Editor A. Kozoriz Compiled by E. Pluzhnikova .Techred O.SopkoCorrector M. Sharoshi Order 3698/42 Circulation 728 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 fig.Z Subscription