SU1255967A1 - Transducer for finding locations of faults in power cables - Google Patents

Abstract

This invention relates to electrical measuring technology. It can be used when searching for places of damage in cables by induction and acoustic methods. The purpose of the invention is the extension of functionality - achieved by using the device as a sensor not only acoustic, but also inductive signals. The sensor includes a housing 1, a first 2, a second 3 permanent magnets, a diamagnetic sleeve 5, the first inductor 6, the frame 8 of the housing, terminals 13 and 14. Additionally, a third permanent magnet 4, a second inductor 7 and a functional unit are inserted 9, containing inverter 10, adders II and 12. Permanent magnet 4 is placed in the upper part of the body, rigidly fixed in it and positioned with a gap above the pole of the same magnet of the same magnet 2. 1 3.pf, 1 ill. her (L h GS SP | SL CP O) / "

Description

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The invention relates to electrical measuring equipment and can be used when searching for places of damage in cables by induction and acoustic methods.

The purpose of the invention is to expand the functionality by applying it as a sensor not only acoustic signals, but also induction.

The drawing shows a diagram of the proposed sensor.

The sensor includes a housing 1, first 2, second 3 and third 4 permanent magnets, diamagnetic sleeve 5, first 6 and second 7 inductors, housing frame 8, functional unit 9 containing inverter 10, first II and second 12 adders.

The first permanent magnet 2 is located inside the diamagnetic sleeve 5 with a gap above the same pole of the second permanent magnet 3, which is located in the lower part of the housing 1 and is rigidly fixed in it, the first inductor 6 is located in the lower part of the housing 1 and rigidly fixed on the frame 8 shells

1, and its coils cover the gap between the first 2 and second 3 permanent magnets, the third permanent magnet 4 is located in the upper part of the housing 1, rigidly fixed in it and located with a gap above the same pole of the first permanent magnet

2, the second inductance coil 7 is located in the upper part of the housing 1 and is rigidly fixed on the frame 8 of the housing 1, and its coils cover) The gap is between the first 2 and third 4 permanent magnets, the first and second terminals of the first inductor 6 are connected to the first and second inputs of the functional unit 9, the first and second terminals of the second coil. 7 inductances are connected to the third and. the fourth inputs of the functional unit 9, the first and second outputs of which are connected to the corresponding output terminals 13 and i 4 sensors.

The first input of the functional block 9 is connected to the first input of the inverter 10 and the third input of the first adder 11, the second input of the functional block 9 is connected to the second input of the inverter 10 and the common bus, the output of the inverter 10 is connected to the second input of the second adder 12, the third input of the functional block 9 connector55967 , 2

It is connected with the first inputs of the first 11 and second 12 adders, the fourth input of the functional unit 9 is connected to the second input of the first accumulator I1 and the common bus.

The sensor works as follows. In the absence of external factors affecting the sensor, the first permanent magnet 2 is in a weighted state in the field of the second 3 and third 4 permanent magnets and is held by the diamagnetic sleeve 5. The EMF at the terminals of the first 6 and second 7, inductors

) 5 are zero.

When searching for a place of damage, the sensor is installed on the ground above the damaged cable in the area previously defined with

2Q using one of the relative search methods. In a damaged cable, the high voltage source connected to it creates discharges at the site of damage.

25 Ground swings propagated in the ground at discharge are transmitted to the housing 1 of the sensor. Oscillations arising from the first and second inductance coils 6 and 7 bonded to the housing 1

3Q in the magnetic field of the first permanent magnet 2 causes the appearance of emf of equal magnitude but opposite in sign at the terminals of these coils. . These EMFs are fed separately to the inputs of the functional unit 9. The EMF of the first inductor 6 is fed directly to the first and second inputs of the first adder 11 and to the first input of the second adder 12. The EMF of the second

35

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coil 7 inductance enters the third input of the first adder 1 and the second input of the second adder 12 through the inverter 10. Thus, at the output terminal 13 of the sensor, the signal is equal to the sum of the EMF of the first 6 and second 7 inductors, and at the output terminal I4 - their differences.

Therefore, when the ground vibrates, the signal at the output terminal 13 is zero, and at the output terminal 14 - a double value of the emf, i.e. the signal corresponds to acoustic oscillations.

The electromagnetic field created by the current flowing in the discharge along the conductors of the damaged cable also induces an emf in the first 6 and second 7 inductors. The magnitude of these EMFs and their sign are the same, since within the size of the sensor su .31255

The existing electromagnetic field of the cable is almost uniform, therefore the signal at the output terminal 14 of the functional unit 9 is absent, and at the output terminal 13 it is equal to double the EMF value, i.e. the signal corresponds to the electromagnetic radiation of a damaged cable.

Thus, the proposed sensor can be used for fixing both an acoustic signal and an induction signal when searching for places of damage in power cables.

Claims (2)

The formula of the invention) 5 1. A sensor for locating damages in power cables, comprising a housing of a diamagnetic material, a diamagnetic sleeve, a sensitive element in the form of a first permanent magnet, a second permanent magnet, the first inductor, and the first permanent magnet located inside the diamagnetic sleeve with a gap above the same pole of the second permanent magnet, the second permanent magnet is located in the lower part of the body and is rigidly fixed in it, the first inductance coil is located in the lower part of the body and rigidly closed replena on the frame, the body, and its coils cover the gap between the first and second permanent magnetics, so that in order to expand its functionality, a third Editor N. Dankulich Order 4818/45 Compiled by E. Kusch Tehred M.Hodanich Corrector A, Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 five 0 five 0 five 9674 a permanent magnet, a second inductance coil and a functional unit, the third permanent magnet is located in the upper part of the body, rigidly fixed in it and located with a gap above the same pole of the first permanent magnet, the second inductance coil is located in the upper part of the body and rigidly fixed on the frame shell, and its coils cover the gap between the first and third permanent magnets, the first and second terminals of the first inductor are connected to the first and second inputs of the functional unit, the first and The second pins of the second inductance coil are connected to the third and fourth inputs of the function block, the first and second outputs of the function block are connected to the first and second output terminals of the sensor. 2. The sensor according to claim 1, that is, that the functional unit contains two adders and an inverter, with the first input of the functional unit connected to the first input of the inverter and to the third input. The first adder, the second the input of the functional unit is connected to the second input of the inverter and the bus, to it by bus, the output of the inverter is connected to the second input of the second adder, the third input of the functional unit is connected to the first inputs of the first and second adders, the fourth input of the functional unit is connected to the second input of the first adder and general th bus. Proofreader A, Obruchar