SU486267A1 - Device for determining electrical insulating materials - Google Patents

Description

one

The invention relates to a technique for examining materials, in particular, devices for determining electrical resistance (and probing voltage of a flat diele (electrically specimens).

Devices are known that contain contact electrodes, a power source, and a measuring circuit.

The purpose of the invention is to carry out contactless measurements.

This is achieved by the fact that the proposed device is equipped with coaxially arranged dielectric cylinders, at the ends of which the measuring electrodes are fixed in the form of a grid, and two auxiliary electrodes are placed inside the cylinders, the cylinders being placed in hermetically sealed electrically insulated from each other.

The drawing shows a diagram of the proposed device.

The device consists of input 1 and measurement input 2 connected to the test electrical circuit, which are mounted on the cylindrical walls of chambers 3 and 4. Input 2 is connected to grid 5, and input 1 is connected to grid 6. The grid 5 is fixed at the end of the cylinder 7, and the grid 6 - at the end of the cylinder 8. Dielectric washers 9 and 10 are attached to the internal ends of cylinders 7 and 8, between which test sample 11 is clamped. Chambers 3 and 4 are separated by a dielectric partition 12 with holes in which washer 10 and cylinder 8 are pressed. cylinders 7 and 8 are placed two pas electrodes 13. The cylinder 7 is connected to the brush 14, which passes through the seal 15. The film 11 (test specimen) is wound on the coils 16, which rotate to move the tape. Chambers 3 and 4 have a dilute gas atmosphere.

The device works as follows.

A voltage is applied to the electrodes 13 and between them in dielectric cylinders.

7 and 8, glow discharges are ignited, and charge carriers are diffused throughout the volume. When applying the potential difference to the grids 5 and 6, an electric field is created in which the directional moving and charge carriers are established. Electrons and ions charge the sample surface to opposite potentials. The potential difference increases, reaches the value of the test voltage, and a dynamic equilibrium is established at which the external current of the grid of grids 5 and 6 is equal to the leakage current through the sample.

The volume resistance of the sample is determined by the measured potential difference.

grids 5 and 6 and sample leakage current.

Subject of the invention. A device for determining the electrical properties of electrically insulating materials, comprising measuring electrodes, a source of titanium, and a measuring circuit, characterized in that, in order to carry out contactless measurements, the device is equipped with coaxially arranged dielectric cylinders, on the ends of which are mounted measuring electrodes in the form of a grid and inside the cylinders two auxiliary electrodes are placed, the cylinders being placed in hermetically sealed electrically insulated from each other ry

-yu