JP2014103723A - Gap type lightning arrester for strain tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gap type lightning arrester for a strain tower which eliminates the need to use a jumper wire V suspension device and the need to extend a tower bracket.SOLUTION: A horizontal support substrate 24 having rigidity as a whole and including a first rigid arm 25 horizontally extending in one direction and a second rigid arm 26 extending oppositely to the first rigid arm is mounted under a bracket 2 of a strain tower via a hinge metal fitting 27 so as to be oscillated in a lateral swinging direction of a jumper wire 6. An upper end of a jumper wire I suspension device 22 is fixed to a central part of the horizontal support substrate 24, and the jumper wire 6 is supported by a jumper wire support fitting 29 at a lower end of the jumper wire I suspension device. An upper end of a lightning arrester 8 is fixed to a distal end side of the first rigid arm 25, and the lightning arrester is disposed vertically. A counter weight is mounted to a distal end side of the second rigid arm 26. A charged-side discharging electrode 13 is mounted to the jumper wire support fitting 29 so as to oppose a grounded-side discharge electrode 12 at a lower end of the lighting arrester 8.

Description

  The present invention relates to a gap type lightning arrester installed in a tension tower of an overhead power transmission line.

  Gap-type lightning arresters that prevent ground faults and short-circuit accidents caused by lightning strikes on overhead power transmission lines include those installed on suspended steel towers and those installed on tension steel towers. As for the gap type lightning arrester installed in the suspension tower, it is common that it is provided alongside the suspension insulator that suspends and supports the overhead power transmission line (see Patent Documents 1 to 4).

  On the other hand, in the case of a tension steel tower, the wire passing directly under the tower armature is a jumper wire that easily rolls due to wind pressure, etc.If the gap type lightning arrester for the suspended tower is applied as it is, the jumper wire rolls. Since the gap dimension between the ground-side discharge electrode and the charging-side discharge electrode may change, it is difficult to keep the lightning protection characteristics constant.

  Therefore, when installing the gap type lightning arrester on the tension steel tower, the lightning arrester is attached in a state in which the jumper wire is prevented from rolling by supporting the intermediate portion of the jumper wire with the V suspension device. 6 and 7 show a conventional gap type lightning arrester for a tension tower. In the figure, 1 is a tension steel tower, 2 is an armature of the tension steel tower 1 (steel armature), 3 is a tension insulator series, 4 is an overhead transmission line (in the example shown, 4 conductors), 5 is a retaining metal fitting, 6 is a jumper wire, 7 is a jumper wire V suspension device that supports an intermediate portion of the jumper wire 6, and 8 is a lightning arrester.

  The jumper wire V suspension device 7 suspends the two insulators 9a and 9b from the steel tower arm 2 so as to be V-shaped when viewed from the line direction, and includes a support fitting 11 (including a yoke or the like) of the jumper wire 6 at the lower end thereof. ) Is attached. The lightning arrester 8 has a ground-side discharge electrode 12 at the lower end, and a voltage-applying discharge electrode 13 is attached to the jumper wire support fitting 11 so as to face the ground-side discharge electrode 12. Thus, the conventional gap type lightning arrester for a tensile steel tower prevents the roll of the jumper wire 5 with the jumper wire V suspension device 7 so that the gap between the ground side discharge electrode 12 and the charging side discharge electrode 13 is reduced. The dimensions are kept constant.

  By the way, the gap type lightning arrester for a tensile steel tower composed of the jumper wire V suspension device 7 and the lightning arrester 8 and the like is usually often attached later to an existing tensile steel tower. However, in the existing tension steel tower, the length of the steel tower arm 2 is insufficient to attach the V suspension device 7 to the steel tower arm 2. For this reason, conventionally, the jumper wire V suspension device 7 is attached after the arm metal extension 14 is added to the front end side of the steel tower arm 2.

JP-A-11-195472 JP 2003-115362 A JP 2003-133029 A Japanese Patent Laying-Open No. 2005-302484

  The conventional gap type lightning arrester for a tensile steel tower uses a jumper wire V suspension to prevent the jumper wire from rolling, so it is necessary to add an arm extension part at the site in the case of an existing steel tower. The construction is large and cumbersome. In the case of a new steel tower, it is necessary to lengthen the length of the steel tower arm, which increases the cost.

  Furthermore, when the jumper wire is supported by the V suspension device, it is necessary to pass the jumper wire through the central portion of the V suspension device. There may be a shortage. For this reason, it is necessary to extend the length of the jumper wire, or to change the jumper wire, and from this aspect, the construction becomes large and troublesome.

  In view of the above problems, an object of the present invention is to provide a gap type lightning arrester for a tension steel tower that does not require the use of a jumper wire V suspension and therefore does not require a long steel tower arm. is there.

The gap type lightning arrester for a tensile steel tower according to the present invention,
Under the armature of the steel tower, there is a first rigid arm that is rigid and extends horizontally in one direction, and a second rigid arm that extends in the opposite direction to the first rigid arm. Install the horizontal support base with the hinge bracket so that it can swing in the roll direction of the jumper wire,
The upper end of the jumper wire I suspension device is fixed to the central portion of the horizontal support base, and the jumper wire support fitting provided at the lower end of the jumper wire I suspension device supports the middle of the jumper wire.
Fix the lightning arrester vertically by fixing the top end of the lightning arrester to the tip side of the first rigid arm,
Attach a counterweight so that the rotational moment is balanced with the lightning arrester side on the tip side of the second rigid arm,
A voltage-applying discharge electrode was attached to the jumper wire support fitting to face the ground-side discharge electrode at the lower end of the lightning arrester,
It is characterized by this.

In the gap type lightning arrester for a tensile steel tower according to the present invention,
The horizontal support base is a horizontal member made of one shape steel horizontally disposed in a direction orthogonal to the extending direction of the steel tower arm metal under the steel tower arm metal, and four fixed to the horizontal member. And a parallelogram member made of
The parallelogram member is fixed to the horizontal member by a pair of diagonal portions, and the first rigid arm is made of a steel plate provided in a direction extending one side of the parallelogram member, The second rigid arm is made of a shape steel provided in a direction extending the opposite side of the one side in the opposite direction to the first rigid arm,
The upper end of the jumper wire I suspension device is fixed to the horizontal member at the center of the parallelogram member,
The horizontal member is swingably attached to the roll direction of the jumper wire via a hinge fitting under the steel tower arm.
It is preferable.

  In the gap type lightning arrester for a tensile steel tower according to the present invention, a weight is preferably incorporated in a jumper wire support fitting provided at the lower end of the jumper wire I suspension device.

  Further, the gap type lightning arrester for a tensile steel tower according to the present invention is preferably configured such that the position where the upper end of the lightning arrester is fixed to the first rigid arm can be adjusted in the longitudinal direction of the first rigid arm. .

  Moreover, the gap type lightning arrester for a tensile steel tower according to the present invention is preferably configured such that the position where the counterweight is attached to the second rigid arm can be adjusted in the longitudinal direction of the second rigid arm.

  Since the gap type lightning arrester for a tensile steel tower according to the present invention supports the jumper wire with the I suspension device, it cannot forcibly prevent the jumper wire from rolling, but the upper end of the I suspension device has a horizontal support base. Since this horizontal support base is attached to the steel tower arm via a hinge fitting so as to be swingable in the roll direction of the jumper wire, the I suspension device and the horizontal support base are integrated together with the jumper wire. Swing. On the other hand, since the lightning arrester is vertically arranged with the upper end fixed to the distal end side of the first rigid arm of the horizontal support base, when the horizontal support base swings, the lightning arrester swings integrally therewith. As a result, the gap dimension between the ground-side discharge electrode at the lower end of the lightning arrester and the charging-side discharge electrode attached to the jumper wire support bracket at the lower end of the I-suspending device is kept constant even when the jumper wire rolls. As a result, stable lightning protection characteristics can be secured.

  In addition, since the jumper wire is supported by the I suspension device, it is not necessary to extend the length of the steel tower arm metal, and it is not necessary to increase the length of the jumper wire or to replace the jumper wire. The gap type lightning arrester can be installed on the steel tower easily and at low cost.

  Further, by configuring the horizontal support base with a horizontal member made of one shape steel, a parallelogram shaped member made of four shape steels, and first and second rigid arms made of shape steel, respectively, A highly rigid horizontal support base can be formed, and the gap dimension between the ground-side discharge electrode and the power-applying discharge electrode can be more reliably maintained constant.

In addition, when the parallelogram member is fixed to the horizontal member with a pair of diagonal portions, the extending direction of the first and second rigid arms is inclined with respect to the extending direction of the steel tower arm metal. The ground side discharge electrode can be moved away from the jumper wire as compared with the case where the second rigid arm extends in a direction perpendicular to the extending direction of the steel tower arm (jumper wire direction), and the first and second rigid arms It is possible to suppress the swing of the lightning arrester when the jumper wire rolls sideways compared to the case where the steel tower arm extends in the extending direction.
In addition, since the first and second rigid arms and the tower arm are crossed, it is designed so that the rigid arm and tower arm do not collide even if the first and second rigid arms swing. There is also an easy advantage.

  Further, by incorporating a weight in the jumper wire support bracket at the lower end of the jumper wire I suspension device, it is possible to suppress the roll of the jumper wire to be small, and the tension applied to the jumper wire I suspension device is increased. It is possible to prevent the I-suspending device from bending when the roll rolls. For this reason, the gap dimension between the ground-side discharge electrode and the charging-side discharge electrode can be more reliably kept constant.

  In addition, by allowing the position where the top end of the lightning arrester is fixed to the first rigid arm to be adjusted in the longitudinal direction of the first rigid arm, the gap dimension between the ground side discharge electrode and the charging side discharge electrode can be adjusted in the field. Can be adjusted.

  Further, by making it possible to adjust the position where the counterweight is attached to the second rigid arm in the longitudinal direction of the second rigid arm, it is possible to easily balance the rotational moments on the lightning arrester side and the counterweight side.

The perspective view which shows one Example of the gap type lightning arrester for tension steel towers which concerns on this invention. The top view of the gap type lightning arrester shown in FIG. The front view of the gap type lightning arrester shown in FIG. The expansion perspective view of the horizontal support base | substrate in the gap type lightning arrester shown in FIG. FIG. 3 is a view taken along line AA in FIG. 2. The side view which shows the conventional gap type lightning arrester for tension steel towers. FIG. 7 is a view taken along line AA in FIG. 6.

  1 to 5 show an embodiment of the present invention. This gap-type lightning arrester for a tensile steel tower includes a horizontal support base 21 disposed under the tower arm 2 and a jumper wire I suspension device 22 that supports the jumper wire 6 passing under the tower arm 2. Yes.

  The horizontal support base 21 includes a horizontal member 23 made of a single steel bar horizontally arranged in a direction perpendicular to the extending direction of the steel tower arm 2, and four steel bars fixed below the horizontal member 23. And a parallelogram member 24. The parallelogram member 24 is fixed below the horizontal member 23 at a pair of diagonal portions. A first rigid arm 25 is attached to one side 24a of the parallelogram member 24 so as to extend one side in one direction, and the opposite side 24b of the one side 24a has the opposite side as the opposite side. A second rigid arm 26 is attached to extend in the opposite direction to the first rigid arm 25. The first and second rigid arms 25 and 26 are also made of steel. One side 24a of the parallelogram member 24 and the first rigid arm 25 may be made of one shape steel. Similarly, the opposite side 24b and the second rigid arm 26 may be made of one shape steel. Good. Since the horizontal support base 21 is configured as described above, the whole has high rigidity. In the illustrated example, an H-shaped steel is used as the shape steel, but other shape steels can be used.

  Two hinge fittings 27 are attached to the upper surface of the horizontal member 23 of the horizontal support base 21 with a predetermined interval (attachment interval to the steel tower arm 2). As shown in FIG. 4, the hinge fitting 27 is formed by connecting two attachment fittings 27a and 27b so as to be rotatable by a hinge shaft 27c. The lower mounting bracket 27 a of the hinge bracket 27 is fixed to the upper surface of the horizontal member 23 so that the hinge shaft 27 c faces the longitudinal direction of the horizontal member 23, and the upper mounting bracket 27 b is fixed to the lower surface of the steel tower arm 2. The As a result, the horizontal support base 21 can be swung in the roll direction of the jumper wire 6 as a whole.

  Next, the jumper wire I suspension device 22 includes one insulator 28 arranged vertically and a jumper wire support bracket 29 (including a yoke) attached to the lower end thereof. As the insulator 28, a long trunk insulator (made of porcelain or polymer) having rigidity (not bending) is used. The upper end of the insulator 28 is fixed to the horizontal member 23 at the center of the parallelogram member 24. Further, as shown in FIGS. 1 and 3, the jumper wire 6 is attached to both side surfaces of the jumper wire support fitting 29 by clamps 30. Further, a weight 31 is incorporated in the jumper wire support fitting 29. The weight 31 suppresses the roll of the jumper wire 6 and increases the tension applied to the insulator 28 to prevent the insulator 28 from bending when the jumper wire 6 rolls. The corner is transmitted to the horizontal support base 21 as it is. The weight 31 can be formed by laminating an appropriate number of thick steel plates. The number of thick iron plates is adjusted so that excessive bending stress is not generated in the insulator 28 in relation to the counterweight 32 described later.

  The upper end of the lightning arrester 8 is fixed to the distal end side of the first rigid arm 25, whereby the lightning arrester 8 is arranged vertically. The lightning arrester 8 has a ground-side discharge electrode 12 at the lower end.

  A counterweight 32 is attached to the distal end side of the second rigid arm 26 so that the rotational moment is balanced with the lightning arrester 8 side with the hinge shaft 27c of the two hinge fittings 27 as the central axis. The counter support 32 and the jumper wire I suspension device 22 keep the horizontal support base 21 horizontal as long as the jumper wire 6 does not roll.

  On the jumper wire support fitting 29, the power application side discharge electrode 13 is attached via a metal arm 33. The charging-side discharge electrode 13 faces the ground-side discharge electrode 12 at the lower end of the lightning arrester 8. The gap dimension between the ground-side discharge electrode 12 and the charging-side discharge electrode 13 is set so as to obtain predetermined lightning protection characteristics.

  In order to be able to adjust the gap dimension between the ground side discharge electrode 12 and the charging side discharge electrode 13, the position where the upper end of the lightning arrester 8 is fixed to the first rigid arm 25 is set in the longitudinal direction of the first rigid arm 25. Can be adjusted. Specifically, for example, as shown in FIG. 5, a number of bolt holes 34 are formed at predetermined intervals in the longitudinal direction of the first rigid arm 25 on the distal end side of the first rigid arm 25, and the lightning arrester 8. The upper end fitting 8a can be fastened and fixed with bolts and nuts at appropriate positions.

  In addition, since the fixing position of the lightning arrester 8 can be adjusted, the position where the counterweight 32 is attached to the second rigid arm 26 is also in the longitudinal direction of the second rigid arm 26 in order to balance the rotational moment. It can be adjusted. In order to adjust the mounting position of the counterweight 32, for example, the U bolt 35 that attaches the counterweight 32 to the second rigid arm 26 is loosened, and the counterweight 32 is slid in the longitudinal direction of the second rigid arm 26. Just do it.

  Reference numeral 36 denotes an electric field relaxation shield ring attached to the jumper wire support bracket 29.

  Since this gap type lightning arrester for a tensile steel tower is configured as described above, when the jumper wire 6 does not roll, the horizontal support base 21 is maintained in a horizontal posture, and the ground-side discharge electrode 12 and the power-supply side The gap dimension between the discharge electrodes 13 is also kept constant. On the other hand, when the jumper wire 6 rolls, the entire horizontal support base 21 and the jumper wire I suspension device 22 swing around the hinge shaft 27c of the hinge bracket 27. However, the lightning arrester 8 moves to the first rigid arm 25. Since it is fixed, the gap size between the ground-side discharge electrode 12 and the power-applying discharge electrode 13 does not substantially change, and therefore the lightning protection characteristics do not substantially change.

  Moreover, since the jumper wire 6 is supported by the I suspension device 22, it is not necessary to extend the length of the steel tower arm 2, and it is not necessary to increase the length of the jumper wire or to replace the jumper wire. In addition, the gap-type lightning arrester can be installed on the tension steel tower easily and at low cost.

Further, by fixing the parallelogram member 24 to the horizontal member 23 at a pair of diagonal portions, the first and second rigid arms 25 and 26 extend obliquely with respect to the extending direction of the steel tower arm 2. It will be. In this way, the ground-side discharge electrode 12 is connected to the jumper wire 6 rather than the case where the first and second rigid arms 25 and 26 extend in a direction perpendicular to the extending direction of the tower arm 2 (the direction of the jumper wire 6). It is possible to prevent the discharge from occurring between the ground-side discharge electrode 12 and the jumper wire 6 during a lightning strike. Further, the swing of the lightning arrester 8 when the jumper wire 6 rolls can be suppressed smaller than the case where the first and second rigid arms 25 and 26 extend in the extending direction of the steel tower arm 2, and safety is ensured. As a result, the change in the gap dimension between the ground-side discharge electrode 12 and the power-applying discharge electrode 13 can be kept small.
In addition, since the first and second rigid arms 25, 26 and the tower arm 2 are crossed, the first and second rigid arms 25, 26 are caused by the roll of the jumper wire 6. There is also an advantage that it is easy to design the apparatus so that the rigid arms 25 and 26 and the steel tower arm 2 do not collide even if they are shaken.

1: Tensile tower 2: Steel tower arm 3: Tensile insulator series 4: Overhead transmission line 6: Jumper line 7: Jumper line V suspension device 8: Lightning arrester 12: Ground side discharge electrode 13: Electric charge side discharge electrode 21: Horizontal support base 22: Jumper wire I suspension device 23: Horizontal member 24: Parallelogram member 25: First rigid arm 26: Second rigid arm 27: Hinge bracket 27c: Hinge shaft 28: Insulator 29: Jumper wire support Metal fitting 30: Clamp 31: Weight 32: Counterweight 33: Metal arm

Claims (5)

Under the armature of the steel tower, there is a first rigid arm that is rigid and extends horizontally in one direction, and a second rigid arm that extends in the opposite direction to the first rigid arm. Install the horizontal support base with the hinge bracket so that it can swing in the roll direction of the jumper wire,
The upper end of the jumper wire I suspension device is fixed to the central portion of the horizontal support base, and the jumper wire support fitting provided at the lower end of the jumper wire I suspension device supports the middle of the jumper wire.
Fix the lightning arrester vertically by fixing the top end of the lightning arrester to the tip side of the first rigid arm,
Attach a counterweight so that the rotational moment is balanced with the lightning arrester side on the tip side of the second rigid arm,
A voltage-applying discharge electrode was attached to the jumper wire support fitting to face the ground-side discharge electrode at the lower end of the lightning arrester,
A gap type lightning arrester for a tensile steel tower characterized by that. The horizontal support base is composed of a horizontal member made of a single steel bar horizontally arranged in a direction perpendicular to the extending direction of the tower arm metal under the tower arm metal, and four fixed members fixed under the horizontal member. A parallelogram member made of a section steel,
The parallelogram member is fixed to the horizontal member by a pair of diagonal portions, and the first rigid arm is made of a steel plate provided in a direction extending one side of the parallelogram member, The second rigid arm is made of a shape steel provided in a direction extending the opposite side of the one side in the opposite direction to the first rigid arm,
The upper end of the jumper wire I suspension device is fixed to the horizontal member at the center of the parallelogram member,
The horizontal member is swingably attached to the roll direction of the jumper wire via a hinge fitting under the steel tower arm.
The gap type lightning arrester for a tension steel tower according to claim 1.   3. A gap type lightning arrester for a tensile steel tower according to claim 1, wherein a weight is incorporated in a jumper wire support fitting provided at a lower end of the jumper wire I suspension device.   The tension steel tower according to any one of claims 1 to 3, wherein a position at which an upper end of the lightning arrester is fixed to the first rigid arm can be adjusted in a longitudinal direction of the first rigid arm. Gap type lightning arrester.   The gap type lightning arrester for a tensile steel tower according to claim 4, wherein a position where the counterweight is attached to the second rigid arm can be adjusted in the longitudinal direction of the second rigid arm.

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