JP6182557B2 - Transmission line construction method using wedge clamp and transmission line construction support device - Google Patents

Description

  The present invention relates to a power transmission line construction method, a power transmission line facility, and a power transmission line construction support apparatus that use a wedge-type clamp to hold a power transmission line on a steel tower for installation.

  Conventionally, a construction method has been developed in which a transmission line is secured to a steel tower using a clamp and installed. As an example, a method of holding the power transmission line on a steel tower by compressing and fixing the end of the power transmission line cut in advance using a compression clamp can be mentioned. However, in this type of construction method, the number of cut portions of the power transmission line increases, and overheating is likely to occur due to deterioration of the connection portion over time, compression failure, and the like. Thereby, there exists a possibility of causing the disconnection of an electric wire in a clamp part for the fall of the electroconductivity in a power transmission line, expansion and breakage of a compression clamp, and worse.

  Therefore, recently, a method using a wedge-shaped clamp (hereinafter referred to as a wedge-type clamp) instead of the above-described compression clamp has been attracting attention. In this method, two wedge-shaped clamps are used to hold one line-like transmission line one by one, and a jumper line is formed while ensuring a separation distance from the steel tower.

  Patent Document 1 proposes a prefabricated overhead wire construction method in which a part (extra length portion) of a jumper wire supported by being slackened into a predetermined shape is formed in a U shape. Thus, it is generally described that the jumper depth becomes less dependent on the adjustment result of the sag.

JP 2000-350344 A (summary, FIG. 1 etc.)

  However, according to the inventor's earnest study, the method proposed in Patent Document 1 can generate a non-uniform electric field in the vicinity of a portion bent sharply in a U shape, and corona discharge can occur. It was found. This corona discharge has a problem that power loss and noise increase. Further, as a harmful effect of partially bending the jumper wire, there is a problem that the mechanical strength of the electric wire is lowered.

  The present invention has been made in view of the above-described problems, and is a wedge type that can prevent power loss and noise from occurring while being a simple technique, and can sufficiently secure the mechanical strength of an electric wire. An object of the present invention is to provide a transmission line construction method, a transmission line facility, and a transmission line construction support device using a clamp.

  In the power transmission line construction method using the wedge clamp according to the present invention, the electric wire is gripped on both sides of the steel tower using the wedge clamp, and the power transmission line is bent under the wedge clamp. It has a drawing process of forming a jumper line from which a surplus line is removed by cutting off the power transmission line between the wedge-type clamps and a drawing process of retaining the steel tower.

  Thus, since the power transmission line between the wedge-shaped clamps is cut off, the jumper line does not include a sharply bent portion, and the possibility that this jumper line becomes a source of corona discharge is reduced. At the same time, a decrease in the mechanical strength of the electric wire is suppressed. Thereby, although it is a simple method, generation | occurrence | production of an electric power loss and noise can be prevented, and the mechanical strength of an electric wire can fully be ensured.

  The computer further includes a calculation step of causing the computer to calculate the length information of the jumper wire or the surplus line by inputting shape information for specifying the bent shape of the jumper wire, and the cutting step is performed by the computer. Preferably, the jumper line is formed based on the length information. By causing the computer to calculate length information corresponding to the bent shape of the jumper wire, it is possible to cut out a surplus line having an appropriate length.

  Further, the shape information is preferably at least one of a jumper depth, a length of an insulator chain, and a catenary angle. By using the main information for specifying the bending shape, the calculation accuracy of the length information is increased.

  The length information may be at least one of a target value, an upper limit value and a lower limit value of the jumper line length, and a target value, an upper limit value and a lower limit value of the length of the surplus line. preferable. By presenting the target value, the upper limit value, or the lower limit value, the length range of the jumper line or the surplus line becomes clear.

  In the calculation step, it is preferable that the length information is calculated on the assumption that the bent shape follows one of a catenary curve and an elliptic curve.

  In the cutting step, it is preferable to connect the cut ends of the power transmission line using any one of a compression clamp, a bolt clamp, and a fusion clamp.

  The transmission line equipment according to the present invention is constructed using any of the transmission line construction methods described above.

  A power transmission line construction support apparatus according to the present invention is an apparatus that supports execution of the above-described power transmission line construction method, and is based on shape information that specifies a flexure shape of the jumper line. A length information calculation unit that calculates length information, and a display unit that displays the length information calculated by the length information calculation unit. Thereby, the operator can easily grasp the length of the jumper line to be left or the length of the surplus line to be cut out while visually checking the displayed length information.

  According to the power transmission line construction method and the power transmission line equipment using the wedge clamp according to the present invention, it is possible to prevent the occurrence of power loss and noise while being a simple technique, and to sufficiently secure the mechanical strength of the electric wire. . Moreover, according to the power transmission line construction support apparatus according to the present invention, the operator can easily grasp the length of the jumper line to be left or the length of the surplus line to be cut out while visually checking the displayed length information. .

It is an electrical block diagram of a smartphone as a power transmission line construction support device according to this embodiment. It is a flowchart of the power transmission line construction method which concerns on this embodiment. It is the 1st explanatory view about a drawing process. It is the 2nd explanatory view about a drawing process. It is the 3rd explanatory view about a drawing process. It is the 4th explanatory view about a drawing process. It is a front partial enlarged view of a temporary jumper part. It is the 1st explanatory view about a cutting process. It is the 2nd explanatory view about a cutting process.

  Hereinafter, a power transmission line construction method using a wedge-shaped clamp according to the present invention will be described with reference to the accompanying drawings by giving preferred embodiments in relation to a power transmission line facility and a power transmission line construction support device.

[Pagoda 12 and jigs and tools for construction of transmission line equipment 90]
First, the steel tower 12 and jigs and tools used for construction of the power transmission line equipment 90 (FIG. 9) according to this embodiment will be described. A plurality of steel towers 12 are erected on the ground 10 at substantially equal intervals. Each of the steel towers 12 is a tension type steel tower that holds the power transmission line 16 using an insulator series 14 made of an insulating material. The jigs and tools used for the construction work of the power transmission line 16 include the insulator series 14, the drum winding electric wire 18, the wire pulling wheel 20, the cam along 22, and the wedge clamp 24.

  The drum winding electric wire 18 includes a drum and an electric wire wound around the drum. The wire pulling wheel 20 is a tool used when the power transmission line 16 is extended. The cam along 22 is a tool that grips and temporarily holds the transmission line 16 under tension. The wedge-shaped clamp 24 is a retainer for holding the power transmission line 16 without cutting.

  Moreover, the smart phone 30 provided with the display function of various information is used as an apparatus which supports execution of the power transmission line construction method which concerns on this embodiment.

  FIG. 1 is an electrical block diagram of a smartphone 30 as a power transmission line construction support apparatus according to this embodiment. The smartphone 30 is a computer that includes a communication unit 32, a control unit 34, a memory 36, a display panel 38 (display unit), a display control unit 40, a touch sensor 42, and a voice call unit 44.

  The communication unit 32 is configured by, for example, an RF (Radio Frequency) module that can input and output radio waves in a high frequency band, and has a function of transmitting and receiving electrical signals from an external device. The control unit 34 is configured by, for example, a microprocessor (MPU), and executes a control operation of each component by reading and executing a program stored in the memory 36. The control unit 34 realizes each function including the shape information acquisition unit 46 and the length information calculation unit 48.

  The memory 36 is constituted by a non-transitory and computer-readable storage medium such as a RAM (Random Access Memory), for example, and a program and data necessary for the control unit 34 to control each component. Is remembered.

  The display panel 38 displays various images including a variable input screen and a result display screen (both not shown) based on the display control signal supplied from the display control unit 40. The touch sensor 42 detects the position of planar coordinates where the contact body 50 including the operator's finger contacts or approaches the display panel 38. The voice call unit 44 includes a speaker, a microphone, a codec, a modulation / demodulation circuit, a call control circuit (all not shown), and the like.

[Explanation of transmission line construction method]
The jig used for construction of the power transmission line facility 90 (FIG. 9) is configured as described above. Next, a power transmission line construction method using these jigs and tools will be described with reference to the flowchart of FIG. 2 and FIGS. Here, it is assumed that the transmission line 16 is installed at a three-level overhead line height.

  In step S <b> 1 of FIG. 2, the worker executes a wire drawing process for extending the power transmission line 16 between the adjacent towers 12. First, the worker fixes the wire-drawing wheel 20 to the plurality of steel towers 12 one by one at a position corresponding to three levels of overhead wire height. Next, the worker places the drum winding wire 18 between the adjacent wire-drawing wheels 20 having the same overhead wire height.

  As shown in FIG. 3A, three power transmission lines 16 having different overhead line heights are extended in a single line on the four steel towers 12. For convenience of explanation, a suffix is given to the reference numeral (12) of the steel tower, and may be described in order from the left side, separately from 12a, 12b, 12c, and 12d. Further, it is assumed that the steel tower 12a is the youngest and the steel tower 12d is the oldest.

  In step S <b> 2 of FIG. 2, the worker executes a retention process for retaining the power transmission lines 16 extended in step S <b> 1 to the plurality of steel towers 12. This drawing step will be described in detail with reference to FIGS. 3 to 5 are diagrams illustrating a process of retaining the upper-phase (upper) power transmission line 16, and FIG. 6 is a diagram illustrating a state in which all the power transmission lines 16 are retained.

  From the state shown in FIG. 3A, the operator attaches the insulator series 14 and the wedge-shaped clamp 24 to the old number side of the steel tower 12a in order, and removes the wire-drawing wheel 20 fixed to the steel tower 12a. Then, one portion of the power transmission line 16 is held by the wedge clamp 24. Thereafter, the worker cuts one end of the power transmission line 16 (the younger side of the tower 12a).

  From the state shown in FIG. 3B, the operator attaches the insulator series 14 and the cam along 22 to the younger side of the steel tower 12b, and attaches the insulator series 14 and the cam along 22 to the younger side of the steel tower 12b. When the cam along 22 is attached, the sag of the tangent object 60 on the younger side of the tower 12b is appropriately adjusted and determined. The tight line object 60 here corresponds to the part of the power transmission line 16 existing between the diameters of the steel towers 12a and 12b. The worker removes the wire-drawing wheel 20 fixed to the steel tower 12b during the series of operations.

  From the state shown in FIG. 4 (a), the operator attaches the wedge clamp 24 to the tip of the insulator series 14 on the younger side of the tower 12b and grips one place of the power transmission line 16, and then the tower 12b. Remove the cam along 22 on the young side. By gripping the power transmission line 16 by the wedge clamp 24, the tight connection state between the diameters of the steel towers 12a and 12b is maintained as it is. Next, the operator secures a long jumper line (a temporary jumper line 74 described later; FIG. 7) by taking in the power transmission line 16 from the old number side of the steel tower 12b.

  From the state shown in FIG. 4 (b), the operator attaches a wedge-shaped clamp 24 to the tip of the insulator series 14 on the old number side of the tower 12b and grips one place of the power transmission line 16, and then the tower 12b. Remove cam along 22 on the old side. By holding the power transmission line 16 by the wedge clamp 24, the tight connection state between the diameters of the steel towers 12b and 12c is maintained as it is.

  From the state shown in FIG. 5A, the worker sequentially repeats the series of operations described above from the younger number side to the older number side. Thereby, as shown in FIG.5 (b), the operation | work which retains the upper phase power transmission line 16 to the some steel tower 12 is completed. Further, by repeating the same operation as that of the upper phase for the intermediate phase (middle) and the lower phase (lower) of the transmission lines 16, the operation of retaining all the transmission lines 16 is completed as shown in FIG.

  In this way, by holding the one-line transmission line 16 one by one using the two wedge-shaped clamps 24, 24, the transmission line 16 is bent between the wedge-shaped clamps 24, 24. To the steel tower 12b. Hereinafter, the two wedge-shaped clamps 24, 24 and a set of components in the vicinity thereof may be collectively referred to as “temporary jumper portion 70”.

  FIG. 7 is an enlarged front view of the temporary jumper unit 70. The temporary jumper portion 70 includes an arm 72 of the steel tower 12, two insulator series 14 and 14 fixed at one end to the arm 72, and two wedge clamps fixed to the other ends of the insulator series 14 and 14, respectively. 24 and 24 and a temporary jumper line 74 which is the power transmission line 16 held between the two wedge-shaped clamps 24 and 24.

  The position of the arm 72 is the origin O, the position of the young wedge clamp 24 is the point P1, the position of the old wedge clamp 24 is the point P2, and the lowest position of the temporary jumper wire 74 is the point P3. Respectively. The length X (unit: m) of the line segment OP1 or the line segment OP2 corresponds to the length of the insulator series 14. The section length Lm (unit: m) from the point P1 to the point P2 corresponds to the length of the temporary jumper line 74. The length Hm (unit: m) of the line segment OP3 corresponds to the actual jumper depth. The angle θ1 (unit: degree) formed by the line segment OP1 and the horizontal line corresponds to the young catenary angle. An angle θ2 (unit: degree) formed by the line segment OP2 and the horizontal line corresponds to an old catenary angle.

  Note that a curved line illustrated by a broken line represents a bent shape of the jumper line 76 in which the jumper depth is equal to the target value Ht and the jumper length is equal to the target value Lt. Hereinafter, when the relationship of Lm> Lt is satisfied, the transmission line 16 having an unnecessary length (surplus length) is referred to as a surplus line 78 (FIG. 8).

  In step S <b> 3 of FIG. 2, the worker executes a calculation process that causes the smartphone 30 to calculate the length information of the jumper line 76 or the surplus line 78. Prior to this calculation, the worker activates application software installed on the smartphone 30. Then, the display control unit 40 (FIG. 1) displays a variable input screen in the display area of the display panel 38.

  Through this variable input screen, the operator can select the length (X) of the insulator series 14, the target value (Ht) of the jumper depth, the young catenary angle (θ1), the old catenary angle (θ2). ), The length (Lm) of the temporary jumper line 74, the margin of the jumper length, the tolerance of the jumper length, or the flexure shape model of the jumper line 76. As this bending shape model, for example, elliptic curve approximation or catenary curve (suspension curve) approximation can be selected.

  The operator touches the calculation start instruction button after the predetermined input operation is completed. Then, the shape information acquisition unit 46 acquires the input current value as the shape information of the jumper line 76. Thereafter, the length information calculation unit 48 calculates the length information of the jumper line 76 or the surplus line 78 using the shape information from the shape information acquisition unit 46. Specifically, the length information calculation unit 48 calculates the bending shape of the jumper wire 76 according to a catenary curve or an elliptic curve by using an integral numerical calculation, an approximate expression, or a reference table (LUT).

  For example, after calculating the half circumference of the ellipse by an approximate expression with X = 4.917 [m] and Ht = 2.9 [m], the catenary angle θ1 = 4.0 [degrees], θ2 = 5.3 [ This length is corrected assuming that [degree] is a primary minute amount. As a result, Lt = 13.641 [m], which is the target value of the jumper length, is obtained.

  The upper limit value Lu of the jumper length is obtained as Lu = 14.141 [m] by adding a margin and an allowable error (maximum error on the positive side) to the target value Lt. Similarly, the lower limit value Ll of the jumper length is obtained as Ll = 13.141 [m] by adding a margin and an allowable error (negative maximum error) to the target value Lt. Further, when the length (Lm) of the temporary jumper line 74 is input, the surplus length target value, upper limit value, and lower limit value can be calculated using the already calculated values of Lt, Lu, and Ll.

  In step S4 in FIG. 2, the worker executes a display process for causing the smartphone 30 to display the length information calculated in step S3. The display control unit 40 (FIG. 1) displays a result display screen in the display area of the display panel 38.

  In step S5 of FIG. 2, the operator executes a cutting process for cutting the temporary jumper line 74 with reference to the display content in step S4. The operator cuts one extra line 78 by cutting the temporary jumper line 74 at two places. Of the remaining temporary jumper wires 74, the younger number side is referred to as a first cutting line 80, and the old number side is referred to as a second cutting line 82.

  As shown in FIG. 8A, when the lengths of the first cutting line 80, the second cutting line 82, and the surplus line 78 are La, Lb, and Lc, respectively, the relationship Lm = La + Lb + Lc is established. Here, it is noted that the cutting is performed so as to satisfy Ll <La + Lb <Lu, more preferably La + Lb = Lt.

  As shown in FIG. 8B, the operator electrically connects the first cutting line 80 and the second cutting ends 84 and 85 using the compression clamp 86, and the jumper wire having a desired length. 76 is formed. In addition, instead of the compression clamp 86, a bolt clamp or a fusion clamp may be used to connect the power transmission line 16.

  Thus, the jumper part 88 which consists of the jumper wire 76 of a desired bending shape is formed by truncating the temporary jumper line 74 which comprises the temporary jumper part 70. FIG. Fig.9 (a) shows the result of having formed the three jumper parts 88 in the steel tower 12b. Moreover, the power transmission line equipment 90 shown in FIG.9 (b) is completed by cutting down similarly about the other steel towers 12c and 12d.

[Effects of this embodiment]
The above-described power transmission line construction method includes a step of securing the power transmission line 16 to the steel tower 12 using a plurality of wedge-shaped clamps 24. By using this construction method, compared with the case where a compression clamp is used, the number of cut portions of the power transmission line 16 is reduced, so that overheating due to aged deterioration of the connection portion, compression failure, and the like is less likely to occur. Thereby, there exists an advantage which can prevent the fall of the electroconductivity in the power transmission line 16, or the expansion | swelling / breakage of the wedge type clamp 24. FIG.

  Further, in this power transmission line construction method, the electric wire wound around the drum is held on both sides of the tower 12 by using the wedge clamps 24, 24, and is bent between the wedge clamps 24, 24. A drawing process (step S2 in FIG. 2) for retaining the power transmission line 16 to the tower 12, and a cut-off forming the jumper line 76 from which the surplus line 78 is removed by truncating the power transmission line 16 between the wedge-shaped clamps 24, 24. A process (step S5 of FIG. 2) is provided. Further, the transmission line facility 90 is constructed by using this transmission line construction method.

  Thus, since the temporary jumper wire 74 between the wedge-shaped clamps 24 and 24 is cut off, the jumper wire 76 does not include a sharply bent portion, and the jumper wire 76 is a source of corona discharge. And a decrease in the mechanical strength of the electric wire is suppressed. Thereby, although it is a simple method, generation | occurrence | production of an electric power loss and noise can be prevented, and the mechanical strength of an electric wire can fully be ensured.

  By the way, in the state shown in FIG.4 (b), the construction method which forms a jumper line without removing the surplus line 78 by taking in the power transmission line 16 only by appropriate length is also considered. However, when this construction method is employed, it is necessary to simultaneously arrange work groups on the three steel towers 12 including both sides and adjust and determine the slackness between two adjacent diameters.

  On the other hand, according to the above-described power transmission line construction method, as in the case where the compression clamp is used, the work teams are simultaneously arranged on the two steel towers 12, and the slackness of one span (tight line target 60) is set. It is enough to adjust and decide As a result, workability is improved.

  In addition, the smartphone 30 includes a length information calculation unit 48 that calculates the length information of the jumper line 76 or the surplus line 78 based on the shape information that specifies the bent shape of the jumper line 76, and the calculated length information. A display panel 38 for displaying is provided. Thereby, the operator can easily grasp the length of the jumper line 76 to be left or the length of the surplus line 78 to be cut out while visually checking the length information displayed in the display step (step S4 in FIG. 2). it can.

  This shape information may include at least one of the jumper depth (Hm), the length (X) of the insulator series 14, and the catenary angles (θ1, θ2). By using the main information for specifying the bending shape, the calculation accuracy of the length information is increased.

  The length information may include at least one of a target value, an upper limit value, and a lower limit value of the length of the jumper line 76, and a target value, an upper limit value, and a lower limit value of the length of the surplus line 78. . By presenting the target value, the upper limit value, or the lower limit value, the length range of the jumper line 76 or the surplus line 78 becomes clear.

[Remarks]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change freely in the range which does not deviate from the main point of this invention.

DESCRIPTION OF SYMBOLS 10. Ground 12 (ad) Steel tower 14 Isogo 16 16 Transmission line 18 Drum winding electric wire 20 Wire extension wheel 22 Cam along 24 24 Wedge clamp 30 Smartphone (power transmission line construction support device)
34 ... Control part 38 ... Display panel (display part)
46 ... Shape information acquisition part 48 ... Length information calculation part 70 ... Temporary jumper part 72 ... Arm 74 ... Temporary jumper line 76 ... Jumper line 78 ... Surplus line 80 ... First cut line 82 ... Second cut line 84, 85 ... Cutting end 86 ... Compression clamp 88 ... Jumper section 90 ... Transmission line equipment

Claims (5)

A holding step of holding the electric wire on both sides of the steel tower using a wedge-type clamp and bending the power transmission line to the steel tower in a state of being bent between the wedge-type clamps;
A calculation step for causing a computer to calculate length information of the jumper line or the surplus line by inputting shape information for specifying a bent shape of the jumper line;
Forming a jumper line from which excess lines are removed by cutting off the power transmission line between the wedge-shaped clamps , and
In the calculation step, the length information is calculated assuming that the bending shape follows either a catenary curve or an elliptic curve,
In the forming step, based on the length information calculated by the computer, the target catenary curve and the target catenary curve are obtained by truncating the power transmission line between the wedge clamps so as not to be included. Forming the jumper line having a shape that does not include a bent portion along one of the shapes of the elliptic curve;
Transmission line construction method using wedge clamp. The power line construction method using a wedge-shaped clamp according to claim 1, wherein the shape information is at least one of a jumper depth, a length of an insulator chain, and a catenary angle . Said length information, the length of the target value of the jumper wire, the upper and lower limits, as well as the length of the target value of the surplus lines, at least one of upper and lower limits, according to claim 1 A transmission line construction method using a wedge-shaped clamp as described in 1. The wedge-shaped clamp according to any one of claims 1 to 3, wherein in the forming step, the cut ends of the power transmission line are connected to each other using any one of a compression clamp, a bolt clamp, and a fusion clamp. Transmission line construction method using An apparatus for supporting execution of a power transmission line construction method using a wedge clamp according to claim 1,
Based on shape information that specifies the bent shape of the jumper line, a length information calculation unit that calculates length information of the jumper line or the surplus line;
A display unit for displaying the length information calculated by the length information calculation unit;
A power transmission line construction support device characterized by comprising:

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