JPH0254813A - Lightning protection insulator device - Google Patents

Abstract

PURPOSE:To facilitate the application of the insulator set in the title to an existing transmission line support insulator set so as to attempt the miniaturization thereof by mounting lightning protection insulators onto a connection fitting on the earthing side and a connection fitting on the electricity-impressed side respectively and installing both lightning protection insulators in such an inclined shape that they may have longer distances from a support insulator toward their tops. CONSTITUTION:Each of a series of suspension insulators 10 is connected to the support arm 1 of a steel tower via a connection fitting (J1) on the earthing side, and then a transmission line (L) is supported by each of the series of suspension insulators 10 via a connection fitting (J2) on an electricity-impressed side. Arc horns, 16 and 17 are installed respectively to the connection fitting (J1) on the earthing side and the connection fitting (J2) on the electricity- impressed side while lightning protection insulators, 21 and 22 are supported by the fittings. A discharge electrode 24 on the earthing side and a discharge electrode 25 on the electricity- impressed side are respectively secured to top portions of the lightning protection insulators, 21 and 22 with an area discharge gap (G) held therebetween Moreover, the lighting protection insulators 21, 22 are installed in such an inclined shape that they may have longer distances from each of the series of suspension insulators 10 toward their top portions. Thus a lightning protection insulator set can be readily applied to an existing transmission line support insulator set while enabling the entire size of the lightning protection insulator set to be miniaturized.

Description

[Detailed Description of the Invention] [Industrial Application Field] When high voltage caused by a lightning strike is applied to a power transmission line, the present invention promptly grounds the voltage and prevents the power transmission line from melting due to the follow-on arc that occurs afterwards. This invention relates to a lightning insulator device for overhead power transmission lines to prevent the above.

[Conventional technology] Avoid conventional power transmission lines! As an insulator device, the applicant is the fourth
We are proposing what is shown in the figure. This lightning arrester device suspends and supports a suspension insulator chain 10 from a support arm 1 of a steel tower via a connecting fitting J1 on the grounding side, and connects a power transmission line to the lower end of the suspension insulator via a connecting fitting J2 on the energized side. Supporting wire clamp 1
I am wearing 4. In addition, a lightning arrester 42 is suspended and fixed to the earthing side connecting fitting J1 via a mounting adapter 41, and a grounding side discharge electrode 43 provided at the lower end of the lightning arrester 42 is connected to the connection fitting J1 on the section q4 side. A predetermined aerial discharge gap G is provided between the discharge electrode 44 on the power-applying side and the discharge electrode 44 supported by the fixture J2 on one side. Further, a balance weight 45 for balancing the load of the lightning arrester 42 is supported on the ground side connecting fitting J1. Further, arc horns 46 and 47 are supported on the connecting fittings J1 and J2 to prevent creeping wires of the suspended insulator chain 10.

[Problems to be Solved by the Invention]However, in the conventional 'ij1 lightning vJ device, one lightning insulator 42 is attached to the connecting fitting J1 on the ground side via the mounting adapter 41, Not only does the length and weight of the lightning arrester 42 increase, the structure is complicated, and the manufacturing cost increases, but it is also difficult to install the lightning arrester 42 unless a special mounting adapter 41 is prepared or the length of the suspension insulator chain 10 is lengthened. There was a pause where it was difficult.

Also, since a dedicated balance weight 45 is required, M
The overall size and weight of the Raidongzi device increased,
It is difficult to apply this method to existing supporting insulator devices, and furthermore, it becomes difficult to transport lightning arrester insulators in mountainous areas or to mount them on steel towers.

In addition, the conventional J! If the lightning insulator device 42 is damaged,! ! Not only does the lightning function not work, but the entire lightning arrester must be replaced, so maintenance costs cannot be reduced.

The object of the present invention is to be able to be easily applied to an existing power transmission line support insulator device, to reduce the size and weight of the entire lightning arrester, to facilitate manufacturing, and to reduce costs. A lightning protection insulator that facilitates transportation work in mountainous areas and installation work on steel towers, and further improves reliability! It is to hold an offering.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects a support insulator to a support arm of a steel tower via a ground side connection fitting, and connects the support insulator to a power supply side connection fitting. The connecting fittings on the grounding side and the charging side are respectively provided with arc horns to prevent surface flashing of the supporting insulator, and the connecting fittings on the grounding side and the charging side are each provided with an arc horn for preventing surface flash of the supporting insulator. Power side evacuation W
The FJ element is supported, and discharge Th electrodes on the ground side and the energized side are attached to the tips of both lightning arresters with an air discharge gap, and further, the tips of both the lightning arresters are spaced apart from the support insulator. The method is to install it diagonally.

[Function] In the present invention, a lightning insulator is attached to each of the connecting fittings on the earthing side and the connecting fitting on the energizing side, and both the lightning arresters are installed in an oblique manner so that the tips are further away from the supporting insulators. The lightning arrester can be mounted using the existing mounting fittings of the arc horn without increasing the length of the support insulator, and the weight of a one-car lightning arrester is reduced, so the structure of the lightning arrester is simplified.

Furthermore, since the weight of the lightning arrester is reduced, the balance weight is also reduced in size and weight to a large IJ, and the entire device is reduced in size and weight.

Furthermore, even if one of the pair of lightning arresters becomes unusable for some reason, the other lightning arrester can handle the lightning surge current during normal operation.
Improved reliability.

[Examples] Examples that embody the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, a mounting bracket 2 is fixed to a support arm 1 of a steel tower with bolts, and a U clevis 3 is swingably locked to the mounting bracket 2. As shown in FIG.

Further, an upper horn mounting bracket 4 is connected to the U clevis 3 so as to be rotatable in the track direction by a connecting pin 5, and a right angle clevis link 6 is connected to the mounting bracket 4 so as to be rotatable in the track direction by a connecting pin 7. is connected to. Further, a pole clevis 8 is connected to the clevis link 6 by a connecting pin 9 so as to be rotatable in a direction perpendicular to the track. A suspension insulator chain 10 as a support insulator is suspended from this pole clevis 8, a socket clevis 11 is supported at the lower end of the suspension insulator chain 10, and a lower horn mounting bracket 12 is supported at the lower end of the suspension insulator chain 10.
are connected by a connecting bin 13 so as to be rotatable in the track direction. Further, a zero wire clamp 14 for supporting a power transmission line is connected to the horn fitting 12 by a connecting pin 15.

In this embodiment, the mounting fitting 2, the U clevis 3, the upper horn fitting 4, the right angle clevis link 6, the pole clevis 8, etc. constitute a ground side connecting fitting J1. In addition, the socket clevis 11 and the lower horn mounting bracket 12
, the electric wire clamp 14, etc. constitute a connection fitting J2 on the power supply side.

On the right arm portions 4a and 12a of the horn mounting bracket 4.12 on the grounding side and power supply side, an arc horn 16. 17 is supported by both arc horns 16.
The weight of 17 is made large in diameter so as to be balanced with the weight 1 of tai1 children 21 and 22, which will be described later.

Further, an upper mounting arm 19.
and a lower mounting arm 20 are each supported by bolts 18. Lightning arresters 21, 22 on the grounding side and on the energizing side are fastened to these mounting arms 19, 20 by bolts 23. These ffi snow insulators 21.2
2 has discharge electrodes 24 and 25 on the grounding side and the charging side.
However, the bolt 26 is tightened and fixed, and an air discharge gap G is formed between the re-discharge electrodes 24 and 25. Further, both of the I lightning insulators 21 and 22 are supported obliquely so as to be farther away from the suspension insulator chain 10 toward the discharge electrode 24 and 25, without changing the length of the suspension insulator chain 10. It is designed to ensure the discharge gap G.

Next, according to FIG. 3, the above 'i! The internal structure of I lightning insulators 21 and 22 will be explained.

The voltage-resistant insulating cylinder 31 is formed of reinforced plastic (FRP) or the like into a cylindrical shape with both upper and lower ends open, and a plurality of pressure relief holes 32 are formed in it. A current-limiting element unit 33 consisting of a plurality of current-limiting elements mainly made of zinc oxide (ZnO) or the like with non-linear voltage-current characteristics is housed inside a voltage-resistant insulating cylinder 31, and its upper and lower ends are in contact with each other. Metal fittings 34.35
is provided.

A pair of electrode fittings 36 and 37 are fitted into both upper and lower ends of the voltage-resistant insulating cylinder 31 and fixed with adhesive 38, respectively. The coil spring 39 is connected to the current limiting element unit 3
The lower contact fitting 35 of No. 3 and the lower electrode fitting 37 are interposed between the two so as to be electrically connected, and the urging force of the coil spring 39 creates contact between each current limiting element in the current limiting element unit 33. The pressure is ensured, and the upper contact fitting 34 of the current limiting element unit 33 is pressed into engagement with the upper electrode fitting 36.

The insulating jacket 40 is made of EPDM (ethylene-propylene-
The pressure-resistant insulation fiJ31 is made of diene copolymer) rubber, etc.
The picture electrode fittings 36 and 37 are airtightly molded on the outer peripheral surface thereof, and a plurality of extending portions 40a are provided on the outside thereof. Also, when molding the insulating jacket 40 described in 111f, the pressure release hole 32 of the voltage-resistant insulating cylinder 3] is also leaked into the gap between the voltage-resistant insulating cylinder 31 and the current-limiting element unit 33.
It is filled with an insulating material such as M rubber.

Note that the upper and lower contact fittings 34 and 35 have mounting arms 19.
20 and a screw hole 36a of the bolt 23.26 for fixing the Vh electrode 24.25.

37a is formed.

Next, the operation of the lightning arrester device for power transmission lines constructed as described above will be explained.

Now, when a lightning surge enters the power transmission line L7 due to a lightning strike, this current is transferred to the wire clamp 14 and the power-supplying side horn mounting bracket 12.
and flows to the lightning arrester 22 on the power supply side via the power supply side mounting arm. The surge current flowing through the current-limiting element unit 33 in the lightning arrester 22 on the energized side flashes across the discharge gap G from the discharge electrode 25 on the energized side and reaches the discharge $$[i24 on the grounding side. The flow flows through the current limiting element unit 33 in the lightning arrester 21 of the grounding side mounting arm 19. The electricity is discharged from the tower body to the ground via the horn mounting bracket 1U clevis 3, the mounting bracket 2, and the support arm 1. In addition, the commercial frequency follow-on current following the lightning surge is suppressed and interrupted by the current limiting element unit 33 and the air discharge gap G in both the III lightning insulators 21 and 22, thereby preventing a ground fault.

Now, in the above embodiment, the lightning arrester 21.22 is connected to the horn mounting bracket 4.12 on the grounding side and the charging side, respectively.
, the weight of one lightning arrester can be reduced, and the internal structure of the lightning arrester can be simplified due to its shortening and weight reduction, making it easier to manufacture and reducing costs. Since the lightning arrester is lighter in weight, the lightning arrester 21 and 22 can be mounted using the existing horn mounting brackets 4 and 12, and the yIIM insulator is separated from the suspended insulator chain 10 toward the tip. Since the suspended insulator chain 10 is tilted and supported, it is easy to secure the discharge gap G between the poles 24 and 25 by a predetermined distance without changing the length of the suspended insulator chain 10. It becomes possible to attach lightning arresters 21 and 22 to the device.

Furthermore, in this invention, the lightning arrester is divided into two, so there is only one! ! Compared to a conventional lightning arrester device in which a lightning insulator is installed, the weight of the entire 'IIIM insulator can be reduced, and it can be easily transported in mountainous areas or installed on a steel tower.

Furthermore, even if one of the Wffi insulators 21, 22 on the grounding side and on the charging side loses its lightning protection characteristics due to deterioration, the other normal one! IW insulators can temporarily process lightning surges and block follow-on currents, improving lightning protection characteristics.

When applying this lightning arrester device to heavily polluted areas, the material of the insulation jacket should be silicone rubber (room temperature or high temperature curing type).
By using water repellency, it is possible to set the same total length as for general areas (i.e., the total length is determined by the internal lightning surge voltage in the air), so this method can be used to significantly reduce size and weight. It is better to have a structure like this.

Note that the present invention can also be embodied as follows.

[1] As shown by chain lines in FIG. 2, both lightning arresters 21
．． By tilting at least one of the wires 22 in a direction perpendicular to the line, an arrangement with a shortened vertical dimension can be achieved.

[2] In the above embodiments, the suspension type lightning arrester device is used, but this can be applied to a tension type lightning arrester device.

[3] In the above embodiment, the diameter of the arc horn 16.17 was increased to give it the function of a weight that balances the weight of the double shunt M 21.22. Since it will be necessary to replace it, it is necessary to configure the horn to be supported by a separately prepared balance weight on the brackets 4 and 12, and to use the existing arc horn with a weight of 21.22 l. is small, so
Balance weights are not necessary.

[4] If the arrangement shown in Figure 1 is not possible due to the relationship with the length of the suspended insulators, the mounting phase should be changed by 180 degrees as shown in Figure 1. They are located on the same side of series 10.

[5] The discharge electrodes 24, 25 are shaped to have a water moiety component, and the device configuration is such that the dimension in the height direction is shortened.

[6] Make the discharge electrode ring-shaped to improve critical path characteristics.

[7] Use silicone rubber as the material for the insulating jacket.

[Effects of the Invention] As detailed above, the present invention can be easily applied to an existing power transmission line support insulator device, and the structure of the M escapement insulator can be simplified and manufactured easily. Furthermore, it has the effect of reducing the weight of the lightning arrester and allowing it to be quickly transported in mountainous areas and installed on steel towers.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention as a suspended lightning arrester device, Fig. 2 is a left side view of the same lightning arrester device, and Fig. 3 is an enlarged longitudinal section of only the ff1i insulator. FIG. 4 is a front view showing another example of the present invention, and FIG. 5 is a front view of a conventional M lightning device. DESCRIPTION OF SYMBOLS 1... Support arm, 2... Mounting bracket, 3... U clevis, 4... Upper horn mounting bracket, 10... Suspension insulator chain, 12... Lower horn mounting bracket, 14...・Wire flang, 16 (17)... Arc horn on the ground (B electric) side, 19 (20>... Upper (lower) mounting arm, 21 (22>... Lightning arrester on the ground (section t) side) Insulator, 2
4 (25)...Discharge electrode on the grounding (power charging) side, 31.
...Voltage-proof insulation tube, 32...Pressure relief hole, 33...Current limiting element unit, 34 (35)...Top (bottom) contact fitting, 36 (37)...Top (bottom) ) as pole metal fittings, 40...
Insulating jacket, Jl (J2)...Grounding (section) side connection fitting, L...Power transmission line, G...Air discharge gap. Patent applicant: Nippon Insulator Co., Ltd. Agent: Patent attorney On 11+ Hiroki Figure 8 36 36a Figure 5

Claims (1)

[Claims] 1. A support insulator is connected to the support arm of the steel tower via a ground side connection fitting, and the support insulator supports a power transmission line via a connection fitting on the energized side, and also connects the ground side and the energized side. Each of the metal fittings is provided with an arc horn for preventing surface flash of the support insulator, and both the connecting metal fittings support lightning arrester insulators on the grounding side and the energized side, and the tips of both lightning arrester insulators are provided with A lightning arrester device characterized in that discharge electrodes on a grounding side and a charging side are attached with an air discharge gap, and further, the ends of the lightning arrester insulators are installed in an oblique manner such that the tips thereof are further away from the support insulator.