RU139574U1 - DKI INSULATION CONTROL SENSOR - Google Patents

Abstract

The insulation monitoring sensor is made up of thousands of electrically conductive nanowires with a thickness of not more than 50 μm, located at a very close distance from each other, and contains a device that records the signal.

Description

The claimed technical solution relates to the electrical industry, in particular, to control the insulation of electrical wires during their winding or rewinding in order to detect insulation defects to prevent leakage of electric current.

An insulation monitoring sensor is known from the prior art in which several metal circuits through which a wire passes are an element that makes contact with the damaged area. High voltage from 5 to 30 kW is supplied to the circuit and to the wire. During the passage of the wire through this device, a spark forms in the place of the insulation defect, which is fixed by this device and stops the winding. The disadvantage of this technical solution is that the circuit itself violates the insulation, as the wire, passing through them, vibrates. Also, the disadvantage is that the high voltage at which this device is operating itself violates the insulation layer. For example, a high-voltage insulation tester “per pass” with an audio frequency voltage “Korona-3ASI-30/30” manufactured by Ermis; Zumbach SPARKMASTER DST Zumbach spark insulation monitoring systems.

The task to which the claimed technical solution is directed is to determine the insulation defect of the electric current conductor without damaging its insulation.

This problem is solved due to the fact that a plurality of nanowires (microfilaments) located around a conductor to which a voltage of 30-70 V is applied, is used as claimed as an element that makes contact with the damaged area. Mechanical impact caused by the movement of an insulated conductor through

many electronic nanowires are absent, since nanowires are many times thinner than the controlled conductor and may be smaller in size than the layer of controlled insulation, and the breaking voltage for wires with enamelled insulation is at least 500 V (see GOST 14340.7-74).

The technical result, which provides the effect of detecting an insulation defect, is based on an increase in the electric field strength on sharp electrodes. A lot of sharp electrodes located close to each other increase the electric field strength of the neighboring electrode, which together leads to the effect of a corona discharge, as well as ionization of the air located in the contact area of the nanowires with a controlled conductor. At the moment of the appearance of a corona discharge provoked by high-electric field strength ionized air, a signal appears that registers the device and stops the winding process.

The essence of the claimed technical solution is illustrated by drawings, which depict:

In FIG. 1 general layout of elements;

Figure 2 fueling scheme.

The device operates as follows. The principle of operation is based on measuring the magnitude of the flowing current along the circuit: sensor, insulation of the monitored section of the wire (see figure 1). If the insulation is damaged, the resistance of the section decreases sharply, the current increases. This current increase is detected by the sensor.

To work with different thicknesses of insulation, and contamination of the wire, a different voltage from 30 to 70 V is applied to the sensor.

For human safety, a direct current limited to 10 mA is used.

Refueling scheme.

1. Install the spool of wire on the winder.

2. Pass the free end of the wire through the insulation monitoring sensor.

3. Strip (remove) the end of the wire and fix it on the shaft of the winder.

4. Turn on the machine.

Connection DKI.

From control unit to DKI sensor There is a separate wire. It is necessary to provide an electrical connection to the common wire of the DKI sensor with a controlled wire. This can be done on the mandrel (machine shaft) (start of winding), or with the end of the wire of the reeling coil, if the winding device allows this connection. It is also necessary to connect the DKI control unit to the machine control unit.

Claims (1)

The insulation monitoring sensor is made up of thousands of electrically conductive nanowires with a thickness of not more than 50 μm, located at a very close distance from each other, and contains a device that records the signal.

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