KR101629786B1 - Device for testing cable with drainwire - Google Patents

Abstract

Disclosed is a shield continuity testing device of shielded cables with a drain capable of easily conducting shield continuity testing of shielded cables. The present invention comprises: a signal providing unit (10) for applying signals to generate electromagnetic waves in shielded cables (1); a housing (20) with a space inside which can prevent external electromagnetic waves, with an insertion hole (21) where the shielded cables (1) are inserted and an exit hole (22) where the shielded cables are withdrawn; a transmitting unit (30) which transmits the shielded cables (1) inserted into the housing (20); and an electromagnetic field sensor (40) which measures an electromagnetic field which may be generated in the shielded cables (1), arranged inside of the housing (20). The purpose of the present invention is to test the prevention performance of electromagnetic waves of the shielded cables.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for shielding continuity of a shielded cable having a drain,

The present invention relates to a shielding continuity testing apparatus for a shielded cable having a drain that can easily check the shielding performance of a shielded cable provided with a drain so as to block electromagnetic noise.

As the use of various electric and electronic devices increases, problems of electromagnetic noise or electromagnetic interference (EMI) are emerging. These noise are generally caused by conduction noise and emission or radiation noise and so on. Electro-magnetic waves generated in various electric appliances or wire rods as power distribution lines have been constantly raised at industrial sites, medical institutions and homes, and some advanced countries have already enacted laws by enacting laws.

A general means for solving the conduction noise uses a noise filter and electromagnetically isolates a predetermined space with respect to radiation noise. For this purpose, it is possible to adopt a method of housing the electrical and / or electronic equipments in a metallic or conductive case, or a method of arranging a metal plate between two circuit boards or surrounding a cable with a metal foil, and also using an electromagnetic wave absorber have.

In particular, the safety grade instrument cable used in the nuclear power field has twisted internal conductors and shielding tapes or drain wires to prevent electromagnetic waves from being affected by surrounding electromagnetic noise.

When a shielded cable having such an electromagnetic shielding function is used, the shielding performance of the shielded cable is inspected to prevent leakage of the electromagnetic wave due to breakage of the drain line or shielding tape at a specific point.

It is inconvenient to check whether the inspection equipment is affected by electromagnetic waves by using a measuring instrument in a place where a shielding cable is installed in order to inspect the shielding performance. The shielded cable before installation has inconvenienced that it is necessary to inspect whether it is influenced by electromagnetic waves by using a measuring device in a state in which all the shielded cables are opened.

Korean Patent No. 10-0896739 (Electromagnetic wave absorption and film production method, electric wire and cable employing electromagnetic wave absorption and shielding film 2009.04.30.)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shielding continuity testing apparatus for a shielded cable having a drain capable of easily checking a shielding performance of a shielded cable having a drain.

It is still another object of the present invention to provide a shield continuity testing apparatus for a shielded cable having a drain capable of performing a shielding performance test while automatically supplying a shielded cable.

In order to accomplish the object of the present invention, there is provided a shielding continuity testing apparatus for a shielded cable having a drain, comprising: signal supplying means for applying a signal to generate a shielded cable; A housing having an insertion port through which the shielding cable is inserted and a lead-out port through which the shielding cable is inserted and an internal accommodation space blocked so as to block external electromagnetic waves; Conveying means for conveying the shielded cable (1) drawn into the inside of the housing; And an electromagnetic sensor mounted on the inner housing space of the housing to measure an electromagnetic field generated in the shielding cable.

In more detail, a shielding tube having an opening in an intermediate region is mounted in the housing, the shielding cable penetrating the shielding tube, and the insertion opening and the extraction opening communicating with each other.

More preferably, the shielding tube is formed of a material that shields electromagnetic waves.

More preferably, the electromagnetic field sensor further comprises: an electric field sensor for sensing an electric field noise output from the shielded cable; And a magnetic field sensor for sensing a magnetic field noise output from the shielded cable.

More preferably, the housing is provided with a control unit for precisely analyzing and evaluating an electric field or a magnetic field component measured by the electromagnetic field sensor; And a display unit connected to the controller and displaying the analyzed information so that the user can recognize the analyzed information.

More preferably, the conveying means is constituted by a drawing roller which is rotatably mounted on the housing so as to draw out the shielding cable which has passed through the drawing-out opening.

More preferably, the conveying means is constituted by a cable bobbin rotatably mounted on the housing so that the cable passing through the take-out opening can be wound.

The present invention relates to a shielding continuity testing apparatus for a shielded cable having a drain that can easily check the shielding performance of a shielded cable provided with a drain so as to block electromagnetic noise.

Further, the present invention can automatically supply the shielded cable and check the shielding performance of the shielded cable, so that the workability is improved.

Further, the present invention has the effect of improving the signal detection capability and improving the reliability of analysis by detecting and analyzing the electromagnetic wave noise while moving the shielded cable within the housing completely shielding the electromagnetic wave in the peripheral part. Since accurate measurement is made only at the point of passing through the opening of the shield tube, it is possible to accurately grasp the point where the electromagnetic wave shield is damaged in the whole cable, so that the damaged part can be easily replaced and repaired.

Further, the present invention prevents electromagnetic wave from being emitted at a point except an opening of a shielding tube through which a shielding cable passes, so that a point at which a shielding function is damaged can be accurately known, thereby facilitating replacement and repair.

FIG. 1 is a perspective view illustrating a shield continuity testing apparatus for a shielded cable having a drain, which is a preferred embodiment of the present invention,
2 is a cross-sectional view showing a shield continuity testing apparatus of a shielded continuous cable having a drain,
3 is a front view showing a shield continuity testing apparatus for a shielded continuity cable having a drain,
4 is a front view showing a shield continuity testing apparatus of a shielded continuity cable having a drain, which is another embodiment of the present invention.
5 is a block diagram showing a shield continuity testing apparatus for a shielded continuous cable having a drain.

Hereinafter, a shield continuity testing apparatus for a shielded cable having a drain, which is a preferred embodiment of the present invention, will be described in more detail with reference to the accompanying drawings.

Here, the shape, size, ratio, angle, number and the like shown in the accompanying drawings are schematic and may be modified somewhat. 2) Since the drawing is shown by the line of sight of the observer, the direction or position to explain the drawing can be variously changed according to the position of the observer. 3) The same reference numerals can be used for the same parts even if the drawing numbers are different. 4) If 'include', 'have', 'have', etc. are used, other parts can be added unless '~ only' is used. 5) Numerals can also be interpreted as described in the singular. 6) Even if the shape, size comparison, positional relationship, etc. are not described as 'weak or substantial', it is interpreted to include the normal error range. 7) 'after', 'before', 'after', 'after', and 'after' are not used to limit the temporal position. 8) The terms 'first, second, third', etc. are used selectively, interchangeably or repeatedly for convenience of division, and are not construed in a limiting sense. 9) If the positional relationship of the two parts is described as 'on top of', 'on top', 'on bottom', 'on side', 'on side' and so on, This can also be located. 10) When parts are electrically connected to '~ or', parts are interpreted to include not only singles but also combinations, but parts are interpreted solely if they are electrically connected to '~ or'.

FIG. 1 is a perspective view showing a shielding continuity testing apparatus for a shielded cable having a drain, which is a preferred embodiment of the present invention, FIG. 2 is a sectional view showing a shielding continuity testing apparatus for a shielded continuity cable having a drain, Fig. 4 is a front view showing a shield continuity testing apparatus of a shielded continuity cable having a drain, which is another embodiment of the present invention, and Fig. 5 is a front view showing a shielded continuity test apparatus of a shielded continuity cable having a drain, Fig. 7 is a block diagram showing a continuity testing apparatus for a continuity cable. Fig.

1 to 3, a shielding continuity testing apparatus for a shielded cable having a drain, which is a preferred embodiment of the present invention, includes a signal supply means 10 for applying a signal to a shielded cable 1, A control unit 50 for analyzing the electromagnetic field detected by the electromagnetic field sensor 40, and a control unit 50 for controlling the electromagnetic field detected by the electromagnetic field sensor 40. The housing 20 includes a housing 20, And a display unit 60.

The shielded cable (1) used in the nuclear power field is designed to have a shielding function by twisting the internal conductor and shielding tapes and draining wires to the outside in order to prevent the noise from being influenced by surrounding electromagnetic noise.

The shielded cable 1 is connected to a signal supply means 10. The signal supply means 10 applies an RF signal having a specific frequency, for example a 30 MHz component, to the internal conductor of the cable, and an electromagnetic field sensor 40 for measuring the proximity electromagnetic wave by applying an EMC scanner outside the shielded cable 1, Check the continuity of the shielding.

The housing 20 is formed of a material that blocks electromagnetic waves. And is made of a metal material that originally shields an electromagnetic wave signal from the outside. In recent years, electromagnetic wave absorbers using metal alloy materials have been widely used as such electromagnetic wave shielding materials. For example, the main raw materials used as the electromagnetic wave absorber include Sandstold alloy, HIGH-FLUXE, Molypermalloy powder (MMP), Fe-Si, Fe-Si- , Amorphous (Fe-Si-Al-Cr), carbon coating iron, Ni-Zn ferrite and Mn-Zn ferrite powder.

The housing 20 has a hexahedral shape. The housing 20 may have a structure in which one hexahedral shape is separated by a partition or two hexahedral shapes are combined as shown in FIG. The housing 20 has an insertion port 21 on one side and an outlet 22 on the other side. The insertion port 21 and the extraction port 22 have a size such that the cable can pass through the inside thereof. The shielding tube 24 formed in a tubular shape communicates the insertion port 21 and the extraction opening 22, and the shielding cable 1 is transferred to the inside thereof. In the central region of the shield tube 24, an opening 23 is penetrated. The shielding tube 24 is made of a material for shielding electromagnetic waves. If electromagnetic waves are emitted from the shielding cable 1, the shielding tube 24 can be transmitted to the outside only through the openings 23.

A conveying means (30) for conveying the shielded cable (1) is mounted on one side or the other side of the housing (20). As shown in Figs. 2 and 3, the conveying means 30 is structured such that the shielding cable 1 is engaged between the two draw-out rollers 31. Fig. The drawing roller 31 is formed of a material having a cushioning force on the outer circumferential surface to prevent the shielding cable 1 from being damaged by the rotational force. Further, the pull-out roller 31 is rotatably mounted on one side of the housing 20, and in the case of a manual type, a rotation pulley which the user can rotate by hand is mounted. In the case of the automatic type, the drawing roller 31 is rotated by a motor which generates a rotating force. At this time, the feeding means 30 is provided with a drawing roller 31 It is preferable that a safety device for stopping the operation of the motor is mounted. The conveying means 30 may be formed on the side of the draw-out port 22 and may be formed on the side of the insertion hole 21 so as to push the shielding cable 1 into the insertion hole 21, And the outflow port 22 may be used.

The conveying means 30 of the shielding continuity testing apparatus according to still another embodiment of the present invention is constituted by a cable bobbin 36 through which the cable 1 passed through the outlet 22 is wound as shown in Fig. The cable bobbin 36 generally has a cylindrical shape in which the cable is wound and has a circular plate mounted on both ends to prevent the cable from coming off. The cable bobbin 36 is rotatably mounted to the housing 20. The cable bobbin 36 is equipped with a rotary knob so that the user can manually rotate the cable bobbin 36 manually. And in the case of an automatic type, the rotating bobbin 36 is rotated by a motor that generates a rotating force.

The electromagnetic field sensor 40 can be applied to any sensor capable of detecting an electric field or a magnetic field. In the present invention, a composite sensor in which an electric field probe and a magnetic field probe are fused is used as the electromagnetic field sensor 40. The electric field detection sensor 41, which is an electric field probe, detects an electric field noise generated by a dipole antenna or a monopole antenna. The magnetic field sensor 42, which is a magnetic field probe, detects the magnetic field noise generated by the loop antenna. Generally, the electromagnetic field sensor 40 using the composite sensor is composed of a sensor unit, an RF signal processing unit, a system control unit, a screen output unit, and the like as main components. The electromagnetic field sensor 40 may detect electromagnetic noise having a specific frequency component in a normal module or PCB layout area, or may be used to precisely analyze and evaluate the magnetic and electric field vector components at a particular location, It is used to determine the function chain, to apply the RF precise comparison, evaluation and documentation of the modified module, and to confirm the product such as emission and shielding of electromagnetic noise in the production process of PCB board, cable and so on.

5, the electromagnetic field sensor 40 includes an electric field detection sensor 41 for detecting an electric field noise output from the shielded cable 1, a magnetic field detection sensor 41 for detecting a magnetic field noise output from the shielded cable 1, (42).

The electric field or magnetic field measured at the electromagnetic field sensor 40 is transmitted to the control unit 50 via the cable 43 and the control unit 50 analyzes and evaluates the components of the sensed electric field or magnetic field. The control unit 50 transmits the analyzed information to the display unit 60. The control unit 50 is installed inside the housing 20 and in a space separated from the space in which the cable 1 is drawn. The display unit 50 is preferably installed on the upper surface of the housing 20 and receives information from the controller 50 and displays the information so that the user can recognize the information. The touch panel of the display unit 50 can be applied.

The electromagnetic field sensor 40 measures a frequency band capable of detecting electromagnetic noise from a minimum of 30 MHz to a maximum of 3 GHz using a loop having a diameter of 10 mm at a sensing portion at a proximity distance of 3 cm or less from the object to be measured.

The operation of the shielding continuity testing apparatus of the shielded cable having the drain, which is a preferred embodiment of the present invention, is as follows.

The shielded cable 1 is prepared to contact the conveying means 30 via the insertion port 21 of the housing 20, the shielding tube 24 and the outlet 22 so as to measure the continuity of shielding of the shielded cable 1 do.

Then, the signal supply means 10 applies a signal to the shielded cable 1. At this time, the applied signal applies an RF signal having a component of 30 MHz to the internal conductor of the cable. The reason why the frequency of the RF signal applied to the internal conductor is 30 MHz is to apply 30 MHz to make the signal having the longest wavelength among the measurable frequency bands of the electromagnetic field sensor 40 to have excellent signal transmission characteristics.

And the shielded cable 1 is transported while a signal is applied to the shielded cable 1. The shielded cable 1 is characterized in that the electromagnetic wave is not emitted to the outside due to a drain, a shielding tape or the like installed therein. If there is an area where electromagnetic waves are emitted due to disconnection of the internal drain or damage of the shielding tape, the electromagnetic field sensor 40 senses the electromagnetic field when the position passes through the opening 23, And determines whether the drain or the shielding tape is damaged by the precise analysis and displays it on the display unit 60. [

The user can determine the presence or absence of internal damage of the shielded cable 1 through the information displayed on the display unit 60. [ Further, the operation of the conveying means 30 allows the shielded cable 1 to pass through the inside of the shielding tube 24 manually or automatically and to test the shielding continuity.

As described above, the shielding continuity testing apparatus of the shielded cable having the drain according to the present invention performs the shielding performance while automatically conveying the shielded cable 1 by using the conveying means 30, so that the work is easy and the working speed is improved.

In addition, since the shielding performance of the shielded cable 1 is checked inside the housing 20 in which noise due to electromagnetic waves can be removed, the reliability of the operation is improved.

In addition, at the point excluding the opening 23 of the shielding tube 24 through which the shielding cable 1 passes, it is possible to precisely know the point where the shielding function is damaged, thereby facilitating replacement and repair.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

1: Shielded cable 10: Signal supply means
20: housing 21:
22: outlet 23: opening
24; Shielding tube 30: conveying means
31: pull-out roller 36: cable bobbin
40: electromagnetic field sensor 50:
60:

Claims (7)

A signal supply means (10) for applying a signal to the shielded cable (1) so that electromagnetic waves can be generated;
A housing 20 having an insertion opening 21 into which the shielded cable 1 is inserted and a lead-out opening 22 through which the shielded cable 1 is inserted and which is made of a material capable of blocking external electromagnetic waves;
A conveying means (30) for conveying the shielded cable (1) drawn into the inside of the housing (20);
A shielding tube 24 formed of a material that penetrates the shielding cable 1 and communicates with the insertion port 21 and the extraction port 22 and has an opening 23 in an intermediate region and shields electromagnetic waves; And
And an electromagnetic sensor (40) mounted on the inner housing space of the housing (20) and having an antenna for measuring an electromagnetic field generated in the shielding cable (1) through the opening,
The electromagnetic field sensor 40 detects the presence of a region where an electromagnetic wave is emitted due to the breakage of the drain in the shielded cable or the damage of the shielding tape when the position passes through the opening portion 23, Test equipment. delete delete 2. The apparatus of claim 1, wherein the electromagnetic field sensor (40)
An electric field detection sensor 41 for detecting an electric field noise output from the shielded cable 1; And
And a magnetic field sensor (42) for sensing a magnetic field noise output from the shielded cable (1). 5. The apparatus according to claim 4, wherein the housing (20)
A control unit (50) for precisely analyzing and evaluating an electric field or a magnetic field component measured by the electromagnetic field sensor (40); And
And a display unit (60) connected to the controller (50) and configured to display the analyzed information so that the user can recognize the information. 6. The apparatus according to claim 5, wherein the conveying means (30)
And a drawer roller (31) rotatably mounted on the housing (20) so as to allow the shielding cable (1) to pass through the outlet (22). 7. The apparatus according to claim 6, wherein the conveying means (30)
And a cable bobbin (36) rotatably mounted on the housing (20) so that the cable (1) passing through the outlet (22) can be wound.

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