SU381045A1 - DEVICE FOR CONTINUOUS MONITORING THE ELECTRICAL STRENGTH OF ELECTRICAL INSULATION - Google Patents

Description

The known device for continuous monitoring of the electrical strength of an electrical insulating tape, containing electrodes for passing said tape between them, one of which is made in the form of a roller with an electrically conductive surface, and guide rollers, does not provide the necessary control objectivity due to the lack of information about density distribution of places with reduced electrical strength; in this case, at the moment of the breakdown of the tape, a short-circuited circuit is formed, and the voltage of the power source drops to zero. However, the possibility is not excluded that other areas with reduced electrical strength or a conductive particle are in the electric field, while its time breakdown is somewhat delayed and does not develop due to a drop in the source voltage.

In order to eliminate this drawback, the other electrode is made in the form of a movable flexible metallized tape loaded onto guide rollers.

The drawing shows the kinematic scheme of the device.

The flexible metallized electrode /, the passage through the guide rollers 2, of the winding mechanism 3, is superimposed on the electrode 4, made in the form of a roller, with a metallized layer on the tested electrical insulating tape 5. One electrode is electrically insulated from the body of the winding mechanism.

of the potentials of the power source, the second one is fed to the guide rollers 2. In this case, the dielectric in the region of the circumference of the electrode 4 is in an electric field, the magnitude of which is determined by the thickness of the dielectric. During the breakdown of the dielectric and the formation of a short-circuited circuit, the metal layer of the second electrode (metallized layer) under the action of the discharge instantly, (1-30),

evaporates, breaking the current path. The source of electrical power in this case does not undergo a significant loss of energy, and the voltage on it remains almost constant. To count the number of breakdowns

it is possible 1 to use most of the pulse counters produced by the domestic industry.

As a metallized ribbon, for example, metallized paper is used, which can be used several times.

Subject invention

A device for continuous monitoring of the electrical strength of an electrical insulating tape, comprising electrodes to pass between them said tape, one of which is in the form of a roller with an electrically conductive top and guide rollers characterized by

By the fact that, in order to increase the objectivity of the control, the other electrode is made in the form of a movable flexible metallized tape loaded onto the said rollers.