RU2617638C2 - Testing device for underground feed cable - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: prior to testing the middle of the cable sample with a length of 500-1000 m including the ends is coiled and tightly mounted in a container (tray) filled with soil. The container is mounted directly on a shaker bed platform. The sample is fixed on a platform at both sides of the shaker bed by clamps and fixed relative to the base, for example, on racks. At both ends the cable is coiled to an inner diameter of at least 20 nominal outer diameters of the cable or wound on drums with a neck diameter similar to the diameter of the coil.

EFFECT: definition of the parameters - criteria of product availability with no mechanical damage to its structure.

3 cl, 1 dwg

Description

The invention relates to the cable industry and for testing cable for underground installation (in sewers, pipes, blocks, collectors, in soils of all categories, in water at the intersection of swamps and shallow rivers).

The technical result consists in creating a device for testing cable for underground installation, which allows to determine the parameters - eligibility criteria:

- integrity of optical fibers;

- the integrity of the sheaths of optical cables (OK);

- attenuation coefficient of optical fibers in accordance with GOST R IEC 793-1-93;

- other indicators depending on the design of the optical cables, for example, electrical insulation resistance of conductive conductors, test voltage of direct or alternating current, electrical capacitance of a pair or core.

This result is achieved in that the device for testing a cable for underground laying contains a container fixed to the platform of the vibrostand for tightly placing in it the middle part of the test cable sample, rigidly fixed on the base from opposite sides of the platform of the vibrostand, an emitter and a receiver with an optical power meter, connected to the respective ends of the test cable sample.

Parts of the test cable sample from opposite sides of the shaker can be wound into coils or wound onto drums with an inner diameter of at least 20 nominal cable outer diameters.

The receiver can be made optoelectric or in the form of an optical reflectometer.

The invention is illustrated in the drawing.

Before starting the test, the middle of the cable sample 1 with a length of 500-1000 m with the ends wound into bays 2 is tightly mounted in a container (tray) 3 filled with soil 4. The container 3 is installed directly on the platform 5 of the vibrating stand. The sample is fixed on the platform 5 on both sides of the shaker by clamps 6 and fixed relative to the base, for example, on racks 9. The cable on both sides is wound into two bays with an inner diameter of at least 20 nominal outer diameters of the cable or wound on drums with a neck diameter similar to that of bays.

The choice of soil in accordance with GOST 25100-95 is based on the creation of experimental effects on the cable structure and the maximum coefficient of friction between the soil and the sheath OK. If no special requirements are made, loam is accepted as soil.

The ends of the test sample 1 are respectively connected to the emitter 7 and the receiver 8 with an optical power meter.

The length of the tray 3 should be (0.5-1.0) m.

Samples 1 to be tested are placed on platform 5 in the center of the test bench. Control of parameters - criteria of suitability is carried out in normal climatic conditions according to GOST 20.57.416-98, after exposure under these conditions for at least 2 hours before and after testing.

After installing the sample on the platform 5 of the shaker, it is exposed to vibration.

The tests are carried out at fixed frequencies from 5 to 100 Hz both in the horizontal and in the vertical plane.

Samples are considered to have passed the test if:

- the increment of the attenuation coefficient of the connected samples after the test does not exceed 10%;

- there are no breaks in the optical fiber and damage to the contact parts of the connectors;

- the connector did not spontaneously open during and after the test;

- during external inspection, there are no damages to the structural elements of the OK.

Evaluation of the test results is made by the stability of the optical characteristics of the connector, as well as in the absence of mechanical damage to its structure and spontaneous disconnection.

Claims (3)

1. A device for testing a cable for underground laying, containing a container mounted on the platform of the vibrating stand with soil for tightly placing in it the middle part of the test cable sample, rigidly mounted on the base from opposite sides of the platform of the vibrating stand, an emitter and a receiver with an optical power meter connected to the corresponding the ends of the test cable sample. 2. The device according to claim 1, characterized in that portions of the test cable sample from opposite sides of the vibrating stand are wound into coils or wound onto drums with an inner diameter of at least 20 nominal cable outer diameters. 3. The device according to p. 1 or 2, characterized in that the receiver is made optoelectric or in the form of an optical reflectometer.

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