JP2003007513A - Polymer lightning arrestor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer lightning arrestor which is improved in strength in the axial direction and has a mechanical weak point that can be provided in the radial direction. SOLUTION: A polymer lightning arrestor is equipped with an inner component composed of zinc oxide elements and an intermediate spacer which are laminated and end face fittings each provided to the end faces of the laminate, a winding cord member which is impregnated with resin and wound on the inner component in the direction of lamination to bind the elements of the inner component together, and a polymer insulating tube which hermetically seals in the inner component and the winding cord member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester capable of promptly discharging a lightning surge current to the ground when a lightning surge current flows through a transmission line or a distribution line, and more particularly to a polymer lightning arrester excellent in mechanical strength and pressure release performance. Is.

[0002]

2. Description of the Related Art FIG. 5 shows, for example, Japanese Patent Publication No. 276121.
FIG. 10 is a schematic partial cross-sectional view of a conventional polymer arrester shown in No. 9. In FIG. 5, reference numeral 1 is a substantially columnar zinc oxide element. Reference numeral 2 is a disk-shaped spacer sandwiched between a plurality of zinc oxide elements 1. Reference numeral 3 denotes end fittings connected to both ends of a cylindrical rod body composed of the stacked zinc oxide element 1 and the spacer 2.

Reference numeral 4 is a glass roving wound around an internal element composed of a zinc oxide element 1, a spacer 2 and an end fitting 3. The glass roving 4 is impregnated with a resin, and one or more layers are wound so as to secure the radial coupling of the internal elements, and the winding angle is 80 ° to the axis.
It is wrapped at a very open angle of 90 °.

Reference numeral 5 is a polymer porcelain tube formed of silicon rubber or the like for hermetically housing the zinc oxide element 1, the spacer 2, the end fitting 3 and the glass roving 4. A large number of insulating pleats are formed on the outer periphery of the polymer insulator tube 5. The end fittings 3 provided at both ends are exposed from the polymer insulator tube 5.

The lightning arrester having such a structure is used as a lightning arrestor for promptly discharging a lightning surge current to the ground when a transmission line or a distribution line flows, and suppressing and interrupting a subsequent current of a commercial frequency. used.

The mechanical strength of the lightning arrester having such a structure is maintained by the glass roving 4, and the strength of the polymer porcelain tube 5 itself is almost zero. Polymer insulator tube 5
Is responsible for the airtightness that prevents the entry of moisture and the withstand voltage as a porcelain insulator.

[0007]

In the conventional polymer arrester having such a structure, since the polymer insulator tube 5 itself has almost no mechanical strength, the mechanical strength is supported by the internal structure. However, the lightning arrester having such a configuration has the glass roving 4 as shown in FIG.
Is wrapped around the inner element at a very open angle with a wrap angle of 80 ° to 90 °. Therefore, while the mechanical strength in the radial direction is extremely large, the strength in the axial direction is weak against bending moment and tensile force.

Further, in the conventional polymer arrester having such a structure, since the glass roving 4 covers the internal elements without a gap, when a short-circuit current flows at the time of a lightning arrester accident, a sudden increase in internal pressure due to arcing occurs. This may cause the upper and lower end fittings 3 to blow up and down.

On the other hand, in Japanese Patent Publication No. 1-183014 and Japanese Patent Publication No. 2-294223, the glass roving is not wound, and holes or slits are provided on the side surface of the FRP cylinder so that the FRP cylinder is mechanically operated in the radial direction. It is proposed to intentionally create the weak points to form the pressure relief device.

The present invention has been made to solve the above-mentioned problems, and provides a polymer lightning arrester capable of increasing the strength in the axial direction and forming a mechanical weak point in the radial direction. With the goal.

[0011]

A polymer lightning arrester according to the present invention comprises an internal element in which a plurality of zinc oxide elements and an intermediate spacer are laminated and end fittings are provided at both ends in the laminating direction.
A winding cord member impregnated with a resin and wound around the inner element in the stacking direction to bind each element of the inner element, and a polymer porcelain tube for sealing the inner element and the winding cord member are provided.

Further, the winding cord member binds the internal elements in a state where each element of the internal elements is applied with a compressive force in the stacking direction.

The winding cord member is wound around the inner element in plural bundles while changing the angle in the radial direction.

Further, the winding cord member is wound by the filament winding method.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 is a sectional view showing a first embodiment of a polymer lightning arrester of the present invention. In FIG. 1, reference numeral 1 is a zinc oxide element having a substantially columnar shape. Two
Is a columnar intermediate spacer having a low height, which is sandwiched between two sets of two zinc oxide elements 1 stacked one by one. Reference numerals 3 are disc-shaped end fittings respectively arranged at both ends of a cylindrical rod body composed of the stacked zinc oxide element 1 and the intermediate spacer 2. On one side surface of the end fitting 3, a groove 3a having a concave cross section for winding the glass roving is formed. The zinc oxide element 1, the intermediate spacer 2 and the end fitting 3 have the same diameter.

Reference numeral 4 denotes a glass roving as a winding cord member impregnated with a resin, which is wound around an internal element 15 composed of the zinc oxide element 1, the spacer 2 and the end fitting 3. The glass roving 4 is wound around the inner element 15 a plurality of times in the axial direction, that is, the stacking direction, while binding the both ends to the groove 3 a of the end fitting 3, and binds each element of the inner element 15.

Further, 19 is a terminal metal connected to both ends of the inner element 15, respectively. The terminal metal 19 is the end fitting 3
It is fastened with bolts 20. Reference numeral 5 denotes a polymer porcelain tube formed of silicon rubber or the like for hermetically housing the inner element 15 and the terminal metal 19. A large number of insulating pleats are formed on the outer periphery of the polymer insulator tube 5. The terminal portions of the terminal gold 19 provided at both ends of the internal element 15 are exposed from the polymer porcelain tube 5.

FIG. 2 is a side view showing a method of fixing the internal element 15 of the polymer arrester. The inner element 15 is fixed as shown in FIG. 2 because the glass roving 4 is wound by the filament winding method. In FIG.
Reference numeral 6 is a rotating rod screwed to the intermediate spacer 2 so as to extend in the radial direction of the inner element 15. Reference numeral 7 denotes a guide plate which is disposed on the side surface of the inner element 15 and is supported by the rotary rod 6 to prevent radial movement of each element of the inner element 15. Reference numeral 9 denotes a support member that is screwed to the end fitting 3 and is erected so as to be substantially parallel to the rotary rod 6. 8 are bridged between the rotary rod 6 and the support member 9 in an extended state, and the internal element 15
Internal element 1 so that each element of
5 is a coil spring that applies a predetermined force in the axial direction. In this way, the inner element 15 is regulated and fixed in the radial direction and the axial direction by the guide plate 7 and the coil spring 8.

FIG. 3 shows a glass roving 4 on the inner element 15.
It is explanatory drawing for demonstrating the filament winding method which winds. The filament winding method is FR
This is one of the methods for forming P (fiberglass reinforced plastics). The internal element 15 fixed in the state of FIG.
The tightened rotating rod 6 is rotatably supported by a support 17 that also functions as a bearing, and is arranged at a predetermined position. The rotary rod 6 is connected to the motor 16 and is rotated by the motor 16. The motor 16 is installed on a pedestal 18.

The glass rovings 4 delivered from several glass roving bundles 11 are twisted by the focusing pad 12, guided by the rollers 13 and sent to the molten resin tank 14. Molten resin is stored in the molten resin tank 14. The glass roving 4 that has passed through the molten resin tank 14 and is impregnated with the resin is wound around the internal element 15 in the axial direction as the rotary rod 6 rotates. afterwards,
The internal element 15 is hardened in a hot air oven (not shown) and is firmly fixed by the ring-shaped band of the glass roving 4. After the glass roving 4 is hardened, the fixing member including the rotating rod 6, the guide plate 7, the coil spring 8 and the support 9 is removed from the inner element 15. And further,
A polymer insulator tube 5 is formed around the inner element 15 to produce a polymer arrester.

In the filament winding method thus performed, the glass roving 4 is wound around the inner element 15 while being impregnated with the resin, so that the inner element 15 is firmly fixed after the glass roving 4 is cured. Further, since the glass roving 4 can be automatically wound, labor can be saved.

The polymer lightning arrester thus manufactured has a plurality of zinc oxide elements 1 and an intermediate spacer 2 laminated therein, and an internal element 15 provided with end fittings 3 at both ends in the lamination direction.
A glass roving 4 impregnated with a resin and wound around the inner element 15 in the stacking direction to bind each element of the inner element 15;
Since the inner element 15 and the polymer porcelain tube 5 for sealing the glass roving 4 are provided, the mechanical strength of the inner element 15 in the axial direction is increased, and it is very resistant to bending moment and tensile force in the axial direction. As it becomes stronger, mechanical weak points are naturally formed in the radial direction, and the upper and lower end fittings 3 or the terminal metal 19 are prevented from flying up and down due to a sudden increase in internal pressure due to the generation of an arc.

Further, the glass roving 4 includes the inner element 1
Since each element of 5 binds the internal element in a state in which a compressive force is applied in the stacking direction by the fixing members of the rotating rod 6, the guide plate 7, the coil spring 8 and the support 9, the internal element 15 is mechanically moved in the axial direction. The strength is further increased.

Embodiment 2. FIG. 4 is a top view of internal elements showing a second embodiment of the polymer lightning arrester of the present invention.
In the first embodiment, only one bundle of the glass roving 4 is wound, but in the present embodiment, as shown in the top view of FIG. It is rolled. In addition, the end fitting 13 of the present embodiment includes two grooves 13 for winding the glass roving 4.
a is formed in a cross.

In the polymer lightning arrester thus manufactured, the glass roving 4 as the winding cord member is wound around the inner element 15 in two bundles while changing the angle by 90 degrees in the radial direction.
Therefore, the mechanical strength in the axial direction is further increased, and the bending moment and the tensile force are further increased.

In the present embodiment, the glass roving 4 is wound in two bundles by changing the angle by 90 degrees in the radial direction. However, the number of bundles is not limited to two and more bundles can be formed by changing the angle. May be wound.

[0027]

EFFECT OF THE INVENTION The polymer arrester according to the present invention has an internal element in which a plurality of zinc oxide elements and an intermediate spacer are stacked and end fittings are provided at both ends in the stacking direction, and a resin-impregnated internal element is wound in the stacking direction. A winding cord member that is turned to bind each element of the inner element and a polymer porcelain tube that seals the inner element and the winding cord member are provided. As a result, the mechanical strength of the internal elements in the axial direction increases and the strength against bending moment and tensile force improves, and mechanical weak points are formed in the radial direction, causing a sudden increase in internal pressure, and It is prevented from flying up and down.

Further, the winding cord member binds the internal elements in a state where each element of the internal elements is applied with a compressive force in the stacking direction. Therefore, the mechanical strength in the axial direction of the internal element is further increased.

The winding cord member is wound around the inner element in plural bundles while changing the angle in the radial direction. Therefore, the mechanical strength in the axial direction is further increased, and the bending moment and the tensile force are further increased.

Further, the winding cord member is wound by the filament winding method. Therefore, the inner element is firmly fixed, and the winding cord member can be automatically wound, which can save labor.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a polymer arrester of the present invention.

FIG. 2 is a side view showing a method of fixing an internal element of a polymer arrester.

FIG. 3 is an explanatory diagram for explaining a filament winding method of winding glass roving around an internal element.

FIG. 4 is a top view of internal elements showing a second embodiment of the polymer lightning arrester of the present invention.

FIG. 5 is a schematic partial cross-sectional view of a conventional polymer lightning arrester.

[Explanation of symbols]

1 zinc oxide element, 2 spacers (intermediate spacers),
3, 13 end fittings, 4 glass roving (winding cord member), 5 polymer porcelain tube, 15 internal elements.

Claims (4)

[Claims] 1. An inner element having a plurality of zinc oxide elements and an intermediate spacer laminated and end fittings provided at both ends in the laminating direction; and an internal element which is impregnated with resin and is wound around the inner element in the laminating direction. A polymer lightning arrester comprising: a winding cord member for binding each element; and a polymer porcelain tube for sealing the internal element and the winding cord member. 2. The polymer lightning arrester according to claim 1, wherein the winding cord member binds the internal elements in a state where each element of the internal elements is applied with a compressive force in the stacking direction. 3. The polymer arrester according to claim 1, wherein the winding cord member is wound around the inner element in a plurality of bundles while changing an angle in a radial direction. 4. The polymer arrester according to claim 1, wherein the winding cord member is wound by a filament winding method.