SU373187A1 - Device for continuous measurement of contact wire wear - Google Patents

Description

(54) DEVICE FOR CONTINUOUS MEASUREMENT OF WEAR

one

The invention relates to the field of energy supply of electric railways and urban electric transport,

Lime device for continuous measurement of wear of the coking wire, containing a support roller moving along the unworn surface of the contact wire, And a wear sensor made as a spring-loaded lever connected to the measuring device with a cam sliding along the worn surface of the contact wire, has a significant drawback: low measurement speed (5-6 km / h) due to the necessity of lateral movement of the sensor along the contact wire when the latter is suspended from the zigzag relative to the axis of the track, the possible descent of the support roller from the contact wire, and also due to the large measurement areas caused by insufficient leveling and contamination of the surface of the contact wire.

To increase the speed and accuracy of measurement in the proposed device, the electromagnetic sensor is made in the form of contact coils.

an exciter of a magnetic rod, fed from an alternating current source, and a receiving coil connected to the measuring unit.

In order to reduce the dimensions of the measurable sensor, the electromagnetic sensor is equipped with guides along (which the measurable contact wire slides, and has a base length, than the double amplitude of permissible perpendicular mixing of the contact wire,

For minimizing the magnetic flux in the receiving coil in the absence of measuring the contact wire in the proposed device, the receiving coil is located between the inner sides of the exciter coils in a plane inclined to the plane of the inner sides of the exciter coil.

Ma fng. 1 shows the proposed device; in fig. 2-section A-A with power lines. And a magnetic field in the absence of KOI clock wire; in fig. 3 - the same, in the presence of a contact wire in the measurement opus.

A device for measuring wear is brought to the contact wire 1 from the bottom and slides along it in the process of measuring right 2. The wear sensor consists of coils 3 and 4 of a magnetic field exciter and a receiving coil 5 rigidly fixed in bar 6 of electrically insulating material. The length of the bar 6 and the coils is chosen not less than the maximum allowable removal and zigzags contact wire. The receiving coil 5 is located in the magnetic field of the exciter between its inner sides in a plane not pvdallelelnogo plane of its sides, so that the magnetic flux penetrating it from sutsvvii above the sensor contact wire was equal to a small value.

The guides 2 are made of wear-resistant material and serve to fix the mutual position of the contact wire and the sensor at a high level. Coils 3 and 4 are connected to the AC source 7 and are connected in such a way that the directions of the currents of the inner sides coincide. The receiving coil 5 is connected to the measuring device 8.

To eliminate the error caused by transverse displacements of the contact wire and its zigzag suspension relative to the axis of the path, the contact wire is located at a small height compared to the length of the exciter coils.

The wear measurement process proceeds as follows.

The insertion of the contact probe 1 into the magnetic field of the exciter leads to the field distortion and the appearance of some component of the flux coupled to the turns of the receiving coil 5. The magnitude of this component depends on the measured section of the contact wire and its height above the sensor. With a fixed height position of the contact wire emf in the receiving coil depends only on the cross section of the wire. The appropriate choice of the geometric dimensions of the elements of the sensor achieved a block to linear dependence of the emf. in the receiving coil from the cross section of the contact wire.

Claims (3)

1. A device for continuous measurement of contact wire wear, containing an electromagnetic sensor and a measuring unit, characterized in that, in order to increase the speed and accuracy of measurement, said electromagnetic sensor is made in the form of magnetic zero exciter coils fed from an alternating current source and a receiving coil connected to the specified measuring unit. 2. The device according to claim 1, which is different from the fact that, in order to reduce measurement errors, the electromagnetic sensor is provided with guides along which the measured contact wire slides, and has a length greater than the double amplitude of permissible transverse displacements of the contact wires 3. The device according to claim 1, characterized in that, in order to maximize the reduction of the magnetic flux in an adjacent coil in the absence of a measurable contact wire, said receiving coil is located between the inner sides of the exciter coils in a plane, inclined to the plane of the inner sides of the coils; fO / 4-A the lines are forced on the floor with the contact probe FIG. 2 chii pshnogo ps npstoja measurement zone The strong lines of the faded TP are based on fig.5.