JP5230868B2 - Movement detection device for power transmission cables in manholes - Google Patents

Description

  The present invention relates to a power transmission cable movement detection device laid in a manhole, and more particularly to a power transmission cable movement detection device that can maintain a detection function even when water enters the manhole.

  Usually, in underground transmission lines, manholes (underground boxes) are installed in the ground at predetermined intervals, and transmission cables are laid in pipe lines connecting the manholes. In the manhole, the operator pulls in, pulls out or connects the power transmission cable. The power transmission cable is started up in the pit from the ground at a power transmission end or a power reception end, and is connected to an electric device via a support insulator.

  The power transmission cable laid on the underground power transmission line repeats expansion and contraction in a load change and a temperature change due to a season, and reciprocates in the power transmission line. In addition, a so-called surf riding phenomenon occurs in which the power transmission cable moves due to vibration caused by traveling of the vehicle on the ground. If the amount of movement of the power transmission cable is small, there is no particular problem, but if the amount of movement is large, the connection portion of the power transmission cable may be pulled and a connection failure may occur. Therefore, it is necessary to monitor the amount of movement of the transmission cable in the underground transmission line. As this monitoring device, a technique for electrically measuring the amount of movement of the power transmission cable at all times has been proposed. As shown in FIG. 7, this measuring apparatus accommodates a sensor main body 72 inside a protective metal fitting 71 having a covered cylindrical shape, and extends a needle-like contactor 73 connected to the lower part of the sensor main body 72 downward. ing. Further, when the detected object 74 attached to the outer peripheral surface of the power transmission cable 12 is pressed against the contact 73 by the movement of the power transmission cable 12, it is detected by the sensor body 72 that the power transmission cable 12 has been moved. It has become.

  Moreover, what was disclosed by patent document 1 as a moving amount measuring apparatus of a power transmission cable is proposed. In this measuring device, a light emitting part and a light receiving part formed by an optical fiber are provided adjacent to each other on the lower surface of a receptacle on which a power transmission cable is placed, and a light reflecting part and a non-reflecting part are provided below these parts. Two reflectors arranged alternately are arranged horizontally. Then, when the power transmission cable is moved in the horizontal direction, the situation where the light irradiated from the light emitting unit to the reflecting plate is incident on the light receiving unit changes, so that the movement direction and the movement amount of the power transmission cable are determined. It has become.

Furthermore, what was disclosed by patent document 2 is proposed as a moving amount monitoring apparatus of a long axis body. This movement amount monitoring device is configured to mechanically detect the movement of the long shaft body.
JP 7-39055 A JP 2007-151282 A

  However, in the detection device shown in FIG. 7, since the vertical dimension of the protective fitting 71 is set short, when water enters the manhole, the water penetrates into the protective fitting 71. Since the sensor main body 72 is submerged, there is a problem that the sensor main body 72 breaks down and the detection operation becomes impossible.

  Further, the apparatus for measuring the amount of movement of the cable disclosed in Patent Document 1 also cannot measure the amount of movement of the cable because the light emitting unit and the light receiving unit are submerged when the inside of the manhole is flooded. was there.

  Furthermore, since the long-axis-body movement amount monitoring device disclosed in Patent Document 2 is configured to detect mechanically, the detection result cannot be confirmed unless an operator enters the manhole. There is also a problem that the detection result cannot be confirmed when the manhole is submerged.

  The present invention solves the above-described problems in the prior art, and when water enters the manhole, the sensor main body is prevented from being submerged and the movement of the power transmission cable can be detected. It is in providing the movement detection apparatus of the power transmission cable.

In order to solve the above-mentioned problem, the invention according to claim 1 is a movement for detecting movement of a power transmission cable by detecting movement of an object to be detected attached to a power transmission cable laid in a manhole by a sensor. In the detection device, a lower end of a covered cylindrical storage case mounted so as to correspond to the detected object is opened in a manhole, the sensor main body is stored inside the storage case, and connected to the sensor main body. A signal line is led out from the housing case, and a needle-like or rod-like contactor connected to the lower part of the sensor body and capable of contacting the detected body protrudes downward from a lower end opening of the housing case, An air chamber is provided between a lower end opening edge of the storage case and a lower end of the sensor body, and the storage case prevents the water from entering the air chamber when the storage case is submerged in a manhole. And summarized in that interposed a sealing member made of vibration isolating material between the inner peripheral surface and the sensor outer peripheral surface of the main body of the case.

According to a second aspect of the present invention, in the first aspect, a filler made of resin or rubber is filled between the upper surfaces of the seal member and the sensor body and the upper inner surface of the housing case. The gist.

According to a third aspect of the present invention, in the first or second aspect , the state in which the power transmission cable is moved, the contact is pushed by the detected object, and the movement of the power transmission cable is detected by the sensor body is in the manhole. The gist of the present invention is that it can be monitored by a monitoring device provided in.

The invention according to claim 4, in claim 3, and summarized in that is transmittable constructed on the ground of the information display device by the mobile information wireless signal transmission cable which is monitored by the monitoring device.

(Function)
According to the present invention, an air chamber is provided between the lower end opening edge of the housing case and the lower end of the sensor body so that water does not enter the air chamber when the housing case is submerged in the manhole. For this reason, it is prevented that water permeates into the air chamber, the sensor body is submerged, and the function of the sensor body is inhibited, and the movement of the power transmission cable is detected by the sensor.

  According to the present invention, when water enters the manhole, the sensor main body can be prevented from being submerged, and the movement of the power transmission cable can be detected by the sensor.

Hereinafter, an embodiment of a moving amount detection system for a power transmission cable in a manhole embodying the present invention will be described with reference to FIGS.
First, a schematic configuration of the movement amount detection system of this embodiment will be described based on FIG. Three power transmission cables 12 are laid inside a manhole 11 arranged underground. A movement amount detection device 13 for individually detecting the movement amount of each power transmission cable 12 is mounted inside the manhole 11. A monitoring device 14 that monitors the movement amount of the power transmission cable 12 based on a detection signal from the movement amount detection device 13 is attached to the pit 11 a of the manhole 11. A trunk frame 15 is fitted into the upper portion of the pit 11a, and an outer lid 16 is attached to the upper portion of the trunk frame 15 so as to be opened and closed. An activation sensor 17 for activating the monitoring device 14 is attached to the body frame 15. The patrol vehicle 19 on the ground unit 18 side is provided with an information display device 20 that displays the amount of movement of the power transmission cable 12 based on the radio signal output from the monitoring device 14.
(Movement detection device 13)
Since the movement amount detection device 13 that detects the movement amount of each power transmission cable 12 is configured in the same manner, the movement amount detection device 13 of one power transmission cable 12 will be described.

  As shown in FIG. 2, a fixed mounting plate 22 is horizontally supported at a predetermined position by a clamp fitting 23 at an upper end portion of a support column 21 erected inside the manhole 11. The fixed mounting plate 22 is formed with two upper and lower position adjusting holes 22a in the horizontal direction and parallel to each other. The front surface of the fixed mounting plate 22 is in contact with a movable mounting plate 24 having two left and right position adjustment holes 24a parallel to each other. The movable mounting plate 24 can be adjusted in the horizontal direction and the vertical direction with respect to the fixed mounting plate 22 by a bolt 25 penetrating the position adjusting hole 22a and the position adjusting hole 24a and a nut 26 screwed into the bolt 25. It is connected. A housing 27 is attached to the lower front surface of the movable mounting plate 24 by brackets 28 and bolts 29. The housing 27 has housing holes 27a formed at three locations so as to be parallel to each other and vertically oriented, and each of the housing holes 27a accommodates contact-type first to third sensors 30A to 30C. ing. Since each sensor 30A-30C is the same structure, the 1st sensor 30A is demonstrated based on FIG.

  As shown in FIG. 1, a flange portion 27b is integrally formed on the inner peripheral surface of the lower end portion of the housing hole 27a of the housing 27, and the lower end edge of the covered cylindrical housing case 31 constituting the first sensor 30A is the flange. Locked to the portion 27b. A sensor body 33 is supported inside the housing case 31 via a seal member 32 made of a vibration-proof material such as a vibration-proof rubber. A needle-shaped first contact 34 </ b> A is connected to the lower end portion of the sensor body 33 so as to be directed downward and to protrude downward from the lower surface of the housing 27. The signal line 35 connected to the upper end of the sensor body 33 is led out through a through hole 31b provided in the center of the lid 31a of the housing case 31. A filler 36 made of synthetic resin or synthetic rubber is accommodated between the upper surfaces of the sealing member 32 and sensor body 33 and the upper inner surface of the accommodating case 31. A connecting portion between the sensor body 33 and the signal line 35 is sealed by a seal member (not shown).

  As shown in FIG. 1, air having a predetermined height in the vertical direction is formed between the lower end opening edge 31 c of the storage case 31, the lower surface of the seal member 32, and the lower inner peripheral surface of the storage case 31. A chamber R is formed. Even when water enters the manhole 11 by the air chamber R and the first sensor 30A is submerged, the water main body R is prevented from entering and the sensor main body 33 is prevented from submerging. Like to do.

As shown in FIG. 2, a clamp ring 41 formed so as to be able to expand in diameter by an elastically deformable material is fitted to the outer peripheral surface of the power transmission cable 12, and a connecting plate portion 41a formed integrally with the lower end portion thereof. Are connected by a bolt 42 and a nut 43. A detection plate 44 as a detection body is attached to the upper outer peripheral surface of the clamp ring 41. A connecting plate portion 44 a is integrally bent at the lower end portion of the detection plate 44 and connected to the clamp ring 41 by a bolt 45. A pusher plate 44b is integrally formed at the upper end of the detected plate 44 so as to correspond to the first contact 34A of the first sensor 30A. The pushing plate 44b is adapted to correspond to the second contact 34B of the second sensor 30B and the third contact 34C of the third sensor 30C.
(Monitoring device 14)
As shown in FIG. 5, the monitoring device 14 includes a sensor information detection unit 51 and a sensor information detection unit 51 that detect sensor information from the first to third sensors 30A to 30C and various other sensors (not shown). A control unit 52 having a storage medium for storing detected various sensor information is provided. The monitoring device 14 includes a data transmission unit 53 for transmitting various sensor information as radio signals from the control unit 52 to the information display device 20 when there is a request for information transmission from the information display device 20 on the ground unit 18 side. I have. The monitoring device 14 includes an activation sensor detection unit 54, and when an activation signal is transmitted by the activation sensor detection unit 54, the control unit 52 and the data transmission unit 53 are activated to move from the movement amount detection device 13. The sensor information is detected. The monitoring device 14 includes a battery 55 that drives each unit.
(Startup sensor 17)
The activation sensor 17 has a function of activating the monitoring device 14, and detects vibration information of the metal outer lid 16 by an acceleration sensor which is a kind of vibration sensor, for example. In addition, a magnetic sensor that detects a magnetic change on the outer lid 16, an ultrasonic sensor that detects ultrasonic waves on the outer lid 16, and the like can be used.
(Information display device 20)
As shown in FIG. 6, the information display device 20 displays a data receiving unit 61 that receives various sensor information transmitted as a radio signal from the data transmission unit 53 of the monitoring device 14, and displays the various sensor information. It is comprised by the display parts 62, such as a notebook type personal computer.
(Operation)
Next, the operation of the power transmission cable movement detection device in the manhole configured as described above will be described.

  The activation sensor detection unit 54 of the monitoring device 14 shown in FIG. 5 is always operated by the battery 55, and the sensor information detection unit 51, the control unit 52, and the data transmission unit 53 are in a dormant state. Yes.

  When acquiring information on the amount of movement of the power transmission cable 12 in the manhole 11 shown in FIG. 4, the upper surface of the metallic outer lid 16 is hit with a hammer or the like by a maintenance worker on the ground portion 18. The vibration information by the hammer is detected by the acceleration sensor activation sensor 17 and the activation sensor detection unit 54 of the monitoring device 14 arranged on the lower surface side of the outer lid 16. When vibration information by the hammer is detected by the activation sensor detection unit 54, the control unit 52 in a pause state shown in FIG. 5 is activated. The activated sensor information detection unit 51 is activated by the activated control unit 52, and the power transmission cable 12 is transmitted by the first to third sensors 30 </ b> A to 30 </ b> C of the movement amount detection device 13 installed corresponding to the power transmission cable 12. The position of the detected plate 44 attached to the terminal, that is, the amount of movement of the power transmission cable 12 is detected. A specific operation for detecting the amount of movement will be described below with reference to FIG.

  FIG. 3A shows an initial setting state in which the detection plate 44 of the power transmission cable 12 is separated from the first to third contacts 34A to 34C to the right by a predetermined distance (for example, 20 mm). In this state, when the power transmission cable 12 has been moved to the left by a predetermined distance (for example, 20 mm) due to the wave riding phenomenon described in the background art, the first contact 34A is displaced by the push plate 44b of the detection plate 44. Thus, the first sensor 30A is in an on state. If the power transmission cable 12 has been moved to the left from the initial state by a predetermined distance (for example, 30 mm), as shown in FIG. 3C, the first contact 34A and the second sensor of the first sensor 30A. Both 30B 2nd contactors 34B are in an ON state. Further, when the power transmission cable 12 has been moved to the left from the initial state by a predetermined distance (for example, 40 mm), the first to third contacts 34A to 34C of the first to third sensors 30A to 30C are all turned on. It is in a state.

  As described above, the state of the detected plate 44 in FIGS. 3A to 3D is transmitted to the sensor information detection unit 51 of the monitoring device 14 via the signal line 35. And the control part 52 of the monitoring apparatus 14 starts the data transmission part 53 in hibernation, and transmits the movement amount information of the acquired power transmission cable 12 to the data receiving part 61 of the information display apparatus 20 of the ground part 18 as a radio signal. To do. The display unit 62 of the information display device 20 displays which of the detection plates 44 of the power transmission cable 12 is in FIGS. As shown in FIG. 3B, the display unit 62 displays that the power transmission cable 12 is moved by a distance causing a problem in one direction when only the first sensor 30A is on. The In addition, as shown in FIG. 3C, when both the first sensor 30A and the second sensor 30B are on, the amount of movement of the power transmission cable 12 from the initial state may be a predetermined amount (for example, 30 mm). Is displayed. Furthermore, when both the first to third sensors 30A to 30C are turned on, it is displayed that the amount of movement of the power transmission cable 12 from the initial state is a predetermined amount (for example, 40 mm).

  When the detection operation of the movement amount of the power transmission cable 12 is completed, the sensor information detection unit 51, the control unit 52, and the data transmission unit 53 are shifted from the activated state to the hibernation state, and are prepared for the next periodic inspection.

According to the movement detection system of the power transmission cable in the manhole of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, as shown in FIG. 1, an air chamber R is formed between the lower end of the sensor body 33 housed in the housing case 31 and the lower end opening edge of the housing case 31, A seal member 32 is interposed between the inner peripheral surface of the housing case 31 and the outer peripheral surface of the sensor body 33. Therefore, even if water enters the manhole 11 shown in FIG. 4 and the housing case 31 shown in FIG. 1 is submerged, the water does not enter the air chamber R and the sensor main body 33 is not submerged. For this reason, the function of the sensor main body 33 is appropriately maintained, and the electric detection operation of the movement amount of the power transmission cable 12 can be appropriately performed in the submerged state of the first to third sensors 30A to 30C.

  (2) In the above embodiment, since the sensor main body 33 is attached to the inner peripheral surface of the housing case 31 via the seal member 32 made of vibration-proof rubber, external vibration is repeatedly applied to the first to third sensors 30A to 30C. Even if this acts, the vibration transmitted to the sensor body 33 is attenuated, and the durability of the sensor body 33 can be improved.

  (3) In the above embodiment, since the housing 27 is mounted so that the position of the housing 27 can be adjusted in the horizontal direction and the vertical direction, the first to third contacts so as to properly face the installation position of the detection plate 44 of the power transmission cable 12. The arrangement positions of the children 34A to 34C can be adjusted.

  (4) In the above embodiment, the first to third sensors 30A to 30C are attached to the housing 27, and the detected plate 44 attached to the power transmission cable 12 can be sequentially brought into contact with the first to third contacts 34A to 34C. Configured. For this reason, it is possible to determine whether or not the power transmission cable 12 has moved, and in a state where the first and second sensors 30A and 30B are turned on, the power transmission cable 12 is set at a predetermined distance from the initial state, That is, it can be detected that the first sensor 30A and the second sensor 30B have been moved by the arrangement pitch P1 in the longitudinal direction of the power transmission cable 12. Further, when all of the first to third sensors 30A to 30C are on, it can be detected that the power transmission cable 12 has been moved by the arrangement pitch (P1 + P2) of the first to third sensors 30A to 30C. .

In addition, you may change the said embodiment as follows.
In the above embodiment, the first to third sensors 30A to 30C are provided to detect the movement amount of the power transmission cable 12, but the power transmission cable 12 is provided at four or more locations, or the sensor is provided only at one location. Only the presence or absence of movement of the cable 12 may be detected.

In the above embodiment, the seal member 32 is formed of vibration-proof rubber, but may be formed of resin or metal.
A sensor having a rod-shaped contact that is linearly reciprocated in the vertical direction may be used instead of the needle-shaped first to third contacts 34A to 34C. In this case, the lower end of the contact is pushed upward by the detected object having an inclined surface, the sensor body is turned on, the movement of the power transmission cable is detected, and the detected object is separated from the contact. Then, the contact is moved downward by a spring in the sensor body.

The center part longitudinal cross-sectional view which shows the 1st sensor of the movement amount detection apparatus of the power transmission cable of this invention. The perspective view of the movement amount detection apparatus of a power transmission cable. (A)-(d) is a top view explaining the detection operation | movement of the moving amount | distance of a power transmission cable. The longitudinal cross-sectional view which shows schematic structure of the movement amount detection system provided in the manhole. The block circuit diagram of the monitoring apparatus. The block circuit diagram of an information display apparatus. The front sectional view of the movement detection device of the conventional power transmission cable.

Explanation of symbols

  R ... Air chamber, 11 ... Manhole, 12 ... Power transmission cable, 14 ... Monitoring device, 20 ... Information display device, 30A-30C ... First to third sensors, 31 ... Housing case, 31c ... Lower end opening edge, 32 ... Seal Member 33 ... Sensor body 35 ... Signal line 36 ... Filler

Claims (4)

In the movement detection device that detects the movement of the detected object attached to the power transmission cable laid in the manhole by the sensor and detects the movement of the power transmission cable,
Open the lower end of a covered cylindrical storage case mounted to correspond to the detected object in a manhole, store the sensor body inside the storage case, and store the signal line connected to the sensor body A needle-like or rod-like contact that is led out from the case and connected to the lower part of the sensor body and that can contact the detected body protrudes downward from the lower end opening of the accommodation case, and the lower end of the accommodation case An air chamber is provided between the opening edge and the lower end of the sensor main body, and the inner peripheral surface of the storage case and the outer periphery of the sensor main body prevent water from entering the air chamber when the storage case is submerged in a manhole. A movement detection device for a power transmission cable in a manhole, wherein a seal member made of a vibration-proof material is interposed between the surface and the surface. The power transmission cable in a manhole according to claim 1 , wherein a filler made of resin or rubber is filled between the upper surfaces of the seal member and the sensor body and the upper inner surface of the housing case. Movement detection device. The state in which the power transmission cable is moved, the contact is pushed by the detected object, and the movement of the power transmission cable is detected by the sensor body can be monitored by a monitoring device provided in the manhole. It is comprised in the movement detection apparatus of the power transmission cable in the manhole characterized by the above-mentioned. 4. The movement detection device for a power transmission cable in a manhole according to claim 3 , wherein the movement information of the power transmission cable monitored by the monitoring device can be transmitted to a ground-side information display device by a radio signal.

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