JP4410035B2 - Cable exploration device and cable exploration method - Google Patents

Description

  The present invention relates to a cable exploration device for exploring a cable to be removed from cables installed in a factory, a power plant, or the like.

  In facilities such as nuclear power plants, cables from a number of equipment in the section are laid in the planned cable path using trays supported by support materials installed on the ceiling or walls. . These cables are classified according to applications such as high-voltage power cables, low-voltage power cables, control cables, and measurement cables.

  The number of cables laid in one tray is, for example, several to dozens for high-pressure power, and ten to several tens for low-pressure power. On the other hand, in the case of control and measurement, there are about several hundred cables. The length per cable ranges from several tens of meters to several hundreds of meters.

  Among the existing cables that have already been installed, the normal cables installed in the tray at the initial stage have a cable group in order to ensure sufficient flame resistance and prevent the cable from spreading in the event of a fire accident, etc. A fire spread prevention material may be applied to the surface. In this case, a flame retardant cable that is additionally laid later is laid on the upper side of the fire spread prevention material.

  When such cables are replaced for reasons such as aging, unnecessary cable removal work is required.

  However, removing unnecessary cables from a tray or the like is a case where the number of cables in the tray is small, such as high-voltage power cables, and the cable to be replaced can be identified relatively easily in the middle of the route. Except for the reasons such as overlapping with other cables, the cable cannot be easily pulled out.

  Also, identification means displaying unique information such as unnecessary existing cable numbers and connection destinations are often attached only to the end of the cable. Therefore, the replacement target cannot be specified in the middle of the cable route. Therefore, the removal of the cable is an operation of sequentially removing the cable from the end of the specified replacement object cable while confirming that the cable is a replacement object, and requires a huge amount of confirmation work.

  Furthermore, if the cable to be removed is cut by mistake, there is a possibility that the system in operation may be seriously affected, and it is necessary to reliably identify unnecessary cables.

  In this way, it is difficult to identify the cable to be replaced from the cable group. Therefore, the existing existing cable is actually removed only from the end device, and the cable route is removed. In the middle, measures were taken to leave it as it was without removing it.

  As a method for making it possible to identify the cable to be replaced even in the middle of the cable route, there is a method of printing or pasting unique information in advance over the entire length of the cable to be newly laid (for example, for example) Patent Document 1, Patent Document 2, and Patent Document 3).

  In addition, as an exploration method for distinguishing a target cable from a plurality of installed cable groups, a current signal or a voltage signal of about several hundred Hz to a hundred kHz is used at a frequency different from the current passing through the cable. There is also a method of intermittently applying a search signal from a transmitter to a target cable (see, for example, Patent Document 4 and Patent Document 5). According to this method, one cable at a location near the point to be cut is detected one by one by detecting the magnetic field or electric field with the probe of the receiver, passing through the filter, and confirming that the exploration signal is on the target cable. Is identified. The receiver converts the intensity of the detected exploration signal into the number of light-emitting diodes and the intensity of sound so that the exploration operator can know. The reason why a search signal having a frequency not normally used in the above method is used is to make it easy to distinguish a magnetic field or electric field noise generated by a cable in another live line state from a search signal.

Also, even if the frequency of external noise generated in other cables other than the search target is the same as the frequency of the search signal, it is determined whether or not the period of the transmission signal of the transmitter and the blinking time of the light emitting diode are the same. The search operator identifies the target cable, or uses a plurality of signals having different frequencies as the search signals, and identifies the cables that have detected all the search signals as search target cables.
Japanese Patent Laid-Open No. 5-137223 JP-A-8-190814 JP-A-9-204435 JP 59-677 A JP 9-2111057 A

  As in the past, it is not necessary to remove only the part of the cable to be replaced with the end device and leave it in the middle of the cable path. It means that it is accumulated in. For this reason, there has been a problem that the number of cables in the tray increases due to replacement or addition of cables, so that the tray becomes full and there is no room for additional cables to be installed.

  In particular, when it is necessary to replace cables for control and measurement, etc., where a large number of cables are installed in the tray, there is space in the tray for installing new cables while leaving the cables to be replaced. In addition, there are many cases where there is not enough space to newly install another tray in the facility. Therefore, by removing existing unnecessary cables, a laying space is secured in the existing tray, and that space Establishing a new cable laying method and conducting cable replacement work was an important issue.

  However, according to the conventional method as described above, for example, in the case of a method of printing or pasting unique information in advance over the entire length of the cable, it is a method that can be applied only when newly laying a cable. There was a problem that it could not be applied to other cables.

  In addition, the exploration method using the exploration signal with a current or voltage signal having a frequency different from the frequency of the energization current has a cable that generates noise with a frequency component very close to the exploration signal in the wiring path tray. When the intensity is high, the light emitting diode of the receiver is lit up continuously or a sound generator such as a buzzer continues to sound, making it difficult to check the intermittent search signal. This is because when another cable is adjacent to the cable to be searched that is applying the exploration signal for a long distance or is in close contact with each other, electromagnetic induction or electrostatic This is because the exploration signal is also induced in the nearby cable by induction or the like.

  The present invention has been made in consideration of the above-described circumstances, and provides a cable exploration device and a cable exploration method that can reliably identify a cable to be replaced from among a plurality of cables. For the purpose.

  In order to solve the above-described problem, the cable exploration device of the present invention uses the electromagnetic conversion element having an annular clamp, and the electromagnetic conversion element using an electromagnetic signal having a frequency different from the current applied to the cable as a transmission exploration signal. A transmitter that applies to the cable, a ring core that is installed on the opposite side of the cable search direction and suppresses transmission of the transmission search signal to the reverse direction side, and an annular clamp that detects magnetic flux A magneto-electric conversion element and a receiver for detecting a reception search signal by the magneto-electric conversion element, and comparing the phase of the transmission search signal and the reception search signal by the receiver to compare the transmission search signal and the reception search signal. A display is output when the signal is not in antiphase.

  In the cable exploration method of the present invention, an annular clamp is adapted to the outer diameter of the cable to be investigated, an electromagnetic conversion element is attached to the cable, and the outer ring of the cable group in the cable exploration direction is annular. An electromagnetic signal having a frequency different from the current applied to the cable is installed by attaching a magnetoelectric conversion element to the cable group by adapting the clamp of the ring, and installing a ring core on the cable in a direction opposite to the direction in which the cable is searched. Is applied to the cable from the transmitter through the electromagnetic conversion element as a transmission search signal, the reception search signal is detected by the receiver by the magnetoelectric conversion element, and the phases of the transmission search signal and the reception search signal are compared. If the phase is not the opposite phase, the display is output.

  According to the cable exploration device and the cable exploration method of the present invention, it is possible to provide a cable exploration device and a cable exploration method that can reliably identify a cable to be replaced from among a plurality of cables.

  An embodiment of a cable search device according to the present invention will be described below with reference to the drawings.

  In FIG. 1, the block diagram of one Embodiment of the cable search apparatus which concerns on this invention is shown.

  The cable search apparatus shown in FIG. 1 includes an electromagnetic conversion element 1 that is a replaceable adapter, and a transmitter 2 that applies a transmission search signal to a cable to be searched. Moreover, the receiver 3 and the magnetoelectric conversion element 4 which detects a received search signal are provided. Furthermore, a ring core 5 having a function of suppressing signal transmission is provided. The electromagnetic conversion element 1 and the magnetoelectric conversion element 4 are formed from a plurality of parts groups each having an annular fitting (hereinafter referred to as a clamp) attached to a cable and having different diameters, in accordance with the outer diameter of the cable to be searched. It is selected and connected to the transmitter 2 and the receiver 3 as replaceable adapters, respectively.

  That is, the electromagnetic conversion element 1 suitable for the outer diameter of the cable to be searched is selected, the transmission search signal is applied as a magnetic signal from the transmitter 2 to the search target cable on the cable search path, This magnetic signal is detected by the receiver 3 via the magnetoelectric transducer 4.

  FIG. 2 shows a configuration diagram in which cable search is performed by the cable search device of this embodiment.

  As shown in FIG. 2, in the cable exploration device of the present embodiment, the electromagnetic conversion element 1 suitable for the outer diameter of the cable is attached to the exploration target cable, and the transmitter 2 has a frequency different from the current that is normally applied to the cable. Then, an electromagnetic signal based on a current at a set frequency of about several hundred Hz to about 100 kHz is applied to the search target cable as a transmission search signal.

  In this figure, since the search direction of the search target cable is the right-handed direction, the ring core 5 made of a material such as ferrite or amorphous metal is mounted on the opposite side of the search direction of the cable. The ring core 5 prevents the search target cable extending to the left side of the transmitter 2 in this figure from sending a transmission search signal to a cable outside the search target cable via a board or device (not shown), and the reverse direction side. The transmission search signal wraps around the other cable that is branched and connected to the other cable, and the transmission search signal of the same phase is prevented from being detected from the other cable.

  As a cable exploration procedure of the cable exploration device having such a configuration, a magnetoelectric conversion element corresponding to the entire outer diameter of a plurality of cable groups roughly divided first with respect to the plurality of cable groups in the exploration direction of the exploration target cable 4 is selected, and a cable group including cables to be searched is selected based on the received signal strength. By repeating this work, the cable group including the cable to be searched is identified by several times of selective surveys, and the target cable is further identified from the cable group.

  That is, the magnetic signal formed by the transmission search signal (electric signal) applied to the cable to be searched through the transmitter 2 and the electromagnetic conversion element 1 by the magnetoelectric conversion element 4 suitable for the target outer diameter is converted into a magnetoelectric conversion. The cable is specified by detecting as a received search signal by the receiver 3 via the element 4.

  At this time, an alternating current generated by the exploration signal in the surroundings causes an induced current to flow in the nearby cable group so as to cancel this magnetic field. The other cables generating magnetic flux are in the opposite phase to the AC current from the search signal.

  FIG. 3 shows a specific configuration diagram of an embodiment of the receiver.

  As shown in FIG. 3, the receiver 3 includes a received signal processing filter 10, an amplifier 11, a phase comparator 12, and an external output circuit 13. That is, the magnetoelectric conversion element 4 detects the received search signal of the cable to be searched as a magnetic signal, the magnetoelectric conversion element 4 converts the magnetoelectric signal into an electric signal, and is set by the transmitter 2 via the reception signal processing filter 10. Only a signal having a set frequency of about several hundred Hz to a hundred kHz is output to the amplifier 11, and the reception signal amplified by the amplifier 11 is input to the phase comparator 12.

  On the other hand, the transmission search signal phase information 14 input from the transmitter 2 is input to the phase comparator 12 through a transmission path (not shown). The phase comparator 12 determines that the phase of the received search signal and the phase of the transmission search signal phase information 14 are not opposite phases, and only when the phase is not opposite, the external output circuit 13 determines the received signal strength according to the above. A configuration is adopted in which the number of light emitting diodes installed in a plurality is changed or the output level of a sound generator such as a buzzer is changed. With this configuration, it is possible to reliably identify a target cable from among a plurality of cables.

  FIG. 4 is an explanatory diagram for comparing the transmission search signal and the reception search signal.

  FIG. 4 shows the relationship between the transmission search signal phase information 14 in FIG. 3 and the reception search signal amplified by the amplifier 11. That is, the reception search signal 15 in FIG. 4 is in phase with the transmission search signal phase information 14. In this case, as described above, the external output circuit 13 turns on a plurality of light emitting diodes or outputs a sound generator such as a buzzer according to the intensity of the received search signal 15.

  On the other hand, the reception search signal 16 in FIG. 4 has a phase opposite to that of the transmission search signal phase information 14. In this case, the cable is an adjacent cable that is juxtaposed with the search target cable to which the transmission exploration signal is applied over a long distance or is almost in contact with the cable, by electromagnetic induction or electrostatic induction, etc. Since it is determined that the transmission search signal is also induced in the cable, the external output circuit 13 is not operated.

  FIG. 5 shows a specific configuration diagram of another embodiment of the receiver.

  The configuration of the receiver 3 shown in FIG. 5 superimposes signals having the same energy density in the positive direction and the negative direction and having different number of pulses as transmission search signals in synchronization with the set frequency. In this embodiment, the phase of the transmission search signal and the reception search signal is confirmed by the number of positive or negative pulses in the received search signal.

  FIG. 6 is an explanatory diagram for comparing the transmission search signal and the reception search signal.

  Here, for example, as shown in FIG. 6, the superimposed signal is a signal having the same energy density in the positive direction and the negative direction and having a different number of pulses in the positive direction and the negative direction. Such a superposition signal is superposed in synchronism with a transmission search signal having a set frequency of about several hundred Hz to a hundred kHz, which has a frequency different from that of the current that is normally applied to the cable.

  In FIG. 5, the transmission search signal 21 including this superimposed signal is detected by the magnetoelectric transducer 4 of the receiver 3, and from several hundred Hz to hundreds of frequencies set in advance by the transmitter 2 via the reception signal processing filter 10. Only a signal having a set frequency of about kHz is output to the amplifier 11. From the search signal amplified by the amplifier 11, a superposed pulse waveform is taken out by the converter 17 and inputted to the comparator 18.

  At this time, if the pulse count in the positive direction matches the pulse count in the positive direction set in advance per cycle of the transmission search signal 21 on which the superimposed signal is superimposed, like the reception search signal 22, transmission is performed. A configuration in which the search signal 21 and the reception search signal 22 are determined not to have opposite phases, and the external output circuit 13 turns on a plurality of light emitting diodes or outputs a sound generator such as a buzzer according to the received signal intensity And

  On the other hand, when the pulse counts in the forward direction are different as in the reception search signal 23, it is determined that the transmission search signal 21 and the reception search signal 23 are in opposite phases, and no display is output.

  Therefore, it is possible to provide a cable searching device that can reliably identify a target cable from among a plurality of cables.

  According to the configuration of the receiver 3 of the embodiment shown in FIG. 5, the configuration in which the transmission search signal phase information 14 input from the transmitter 2 is input to the receiver through the transmission path can be omitted. It can be a cable exploration device.

The block diagram which shows the Example of the cable search apparatus which concerns on this invention. The block diagram which implements cable search by the cable search apparatus of an Example. The block diagram which shows the specific structure of one Example of a receiver. Explanatory drawing which compares a transmission search signal and a reception search signal. The block diagram which shows the specific structure of the other Example of a receiver. Explanatory drawing which compares a transmission search signal and a reception search signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic conversion element 2 Transmitter 3 Receiver 4 Magnetoelectric conversion element 5 Ring core 10 Filter 11 Amplifier 12 Phase comparator 13 External output circuit 14 Transmission search signal phase information 15 Reception search signal 16 Reception search signal 17 Converter 18 Comparator 21 Transmission Search signal 22 Receive search signal 23 Receive search signal

Claims (5)

An electromagnetic conversion element having an annular clamp, a transmitter for applying an electromagnetic signal having a frequency different from that of the current applied to the cable to the cable as a transmission search signal by the electromagnetic conversion element, and a direction opposite to the search direction of the cable A ring core that is installed on the direction side and suppresses transmission of the transmission exploration signal to the reverse direction side, a magnetoelectric conversion element having an annular clamp that detects magnetic flux, and reception that detects a reception exploration signal by the magnetoelectric conversion element A phase difference between the transmission search signal and the reception search signal is output by the receiver, and the display is output when the transmission search signal and the reception search signal are not in reverse phase. Cable exploration device. The reception exploration signal including the superposition signal by the receiver, the superimposition signal having the same energy density in the positive direction and the negative direction and having a different number of pulses superimposed on the transmission exploration signal in synchronization with the set frequency of the reception exploration signal. 2. The cable search apparatus according to claim 1, wherein the number of pulses in the positive direction or the negative direction is counted and the phases of the transmission search signal and the reception search signal are compared. The said electromagnetic conversion element and the magnetoelectric conversion element are provided with the some adapter from which the internal diameter of the said clamp differs so that the outer diameter of the said cable may be adapted. Cable exploration device. An electromagnetic clamp is fitted to the cable by fitting an annular clamp to the outer diameter of the cable to be searched, and a magnetoelectric transducer is fitted to the outer clamp of the cable group in the cable search direction. A ring core is attached to the cable group, and a ring core is installed on the cable in the direction opposite to the cable search direction. An electromagnetic signal having a frequency different from the current applied to the cable is transmitted from the transmitter as the electromagnetic signal. Applied to the cable through the conversion element, the magneto-electric conversion element detects the received search signal with a receiver, compares the phase of the transmission search signal and the received search signal, and displays if the phase is not opposite A cable exploration method characterized by output. The reception exploration signal including the superposition signal by the receiver, the superimposition signal having the same energy density in the positive direction and the negative direction and having a different number of pulses superimposed on the transmission exploration signal in synchronization with the set frequency of the reception exploration signal. 5. The cable search method according to claim 4, wherein the number of pulses in the positive direction or the negative direction is counted and the phases of the transmission search signal and the reception search signal are compared.

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