SU143137A1 - Electrostatic instrument for measuring high voltages - Google Patents

Description

Electrostatic instruments for measuring high voltages are known, containing two rigidly bonded and insulated electrodes, one of which has a silky shape and the other is made in the form of a closed metal box containing the instrument's mobile system, consisting of two hardened) ia stretching flag plates located at the bottom of the box, provided with apertures for influencing the electric field when the measured voltage is applied to their electrodes.

The novelty of the proposed device lies in the fact that it uses a metal disk that is rotatably fixed at the bottom of the electrode box and equipped with two groups of measuring holes that, when the disk is rotated, are aligned with the corresponding holes in the bottom of the electrode box. Such an embodiment of the device makes it possible to vary the limits of measurement while maintaining a constant distance between the electrodes and, accordingly, the shape of the scale of the device.

In order to increase the voltage of the surface overlap, due to which it becomes possible to increase the measurement limits, the device uses the holder of the case of the moving system, made of insulating pipes arranged at an angle between them and fixed at one end to the base of the device outside the fixed electrode - to the top cover of the mobile system.

FIG. 1 shows the device; in fig. 2 is a two-sector moving mechanism.

The device consists of the following basic elements: bases /. supporting insulators 2, connecting insulators 3, measuring and flat electrodes 4 and 5, to which the voltage is applied, and illuminator 6.

The porcelain insulators of the device are removed from the area of a strong electric field, which makes it possible to reduce the effect of humidity and to increase the number 1431372

Chip Alert. Stowy is also promoted by the fact that the metal parts for fastening and embedding the upper cone of the supporting insulator are shielded from a strong electric field by a metallic body of the high-voltage electrode itself. Such a design eliminates artificial methods of regulating the electric field in the place of porcelain embedded in metal, due to which simplicity and low cost of manufacturing insulators is achieved.

Inside the upper electrode 4, the measuring system of the device is enclosed with a light reading on a transparent scale 7 installed in the outer wall of the box. The movable system of the device is made on extensions 8 and consists of two movable flag-plates 9, symmetrically fixed on the axis 10 of the movable system. The plates are located at the bottom of the electrode, which is provided with holes for the electric field between the electrodes to act on the movable flags. A rotary disk 11 is fitted on the bottom of the box electrode, provided with two groups of 12 and 13 holes of various configurations that, when the disk is rotated, coincide with the holes in the bottom of the electrode body and serve to change the measuring limits of the instrument.

Due to the flat shape of the moving element (flag), it is possible to change the measurement limits not by changing the distance between the high-voltage electrodes, but by changing the window under the flag, which is simpler and more accurate. Changing the window under the flag occurs simultaneously with changing the scale to another measurement limit.

The design of the movable instrument system not only increases the torque and, consequently, the quality factor of the instrument, but also drastically reduces the effect of air flow around the instrument on the deviation of the movable system. The latter is explained by the occurrence of opposing moments from the action of these flows.

The forces from the normal component of the electric field and the self-weight of the mechanism are directed along the axis of stretching, which provides greater rigidity and balance of the moving part of the measuring mechanism.

Before transportation, the device is installed in four parts and can be stowed in two chic cases. Accuracy of assembly is provided by clamps and necessary tolerances.

The device measures the constant and variable voltages of the low and high frequencies and is made and two measurement limits: 25-125 and 100--250 kV. Device class 2.5.

Subject invention

Claims (2)

1. Electrostatic device for measuring high voltages, containing two electrodes bonded and insulated from each other, one of which has a flat shape, and the other is made in the form of a closed metal box containing the device’s movable system consisting of two reinforced bars. flag plates located at the bottom of the box, provided with apertures for influencing the electric field on the flags when a measured voltage is applied to their electrodes, characterized in that, in order to change the limits of tim while maintaining constant the distance between the electrodes applied is pivotally fastened to the bottom of the box electrode is a metal disk provided with two sets of openings, the disc was rotated compatibilizing sootvetstvuyuishmi with openings in the bottom of the box-electrode. 2. In the device according to p. 1-use of the holder of the body of the moving system, made of insulating pipes, arranged at an angle between them and fastened at one end to the base of the device outside the stationary electrode, and the other to the top cover of the mobile system.