JPS63200421A - Lightningproof horn insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to (1) a lightning protection horn insulator device in which a lightning arrester is skillfully incorporated into a hanging type long trunk support insulator device.

(Prior art) Conventionally, lightning arrester insulators have not been installed around V-hanging type support insulators for installing power transmission lines on tower bodies, and the V-hanging type support insulators simply support power transmission lines. It had only one function.

(Problems to be Solved by the Invention) However, the above-mentioned conventional hanging type support insulator device is often used in areas where snow disasters occur, and in these cases, when abnormal voltage is applied to the power transmission line due to a lightning strike, A flash short occurs between a pair of arcing horns attached to both ends of the suspension insulator between the electric wire and the tower body, and upon sensing this, the circuit breaker at the substation is activated.
There was a problem with temporary power outages.

The present invention solves the above-mentioned problems, provides a stable column installation state, can be easily applied to the existing V-hanging type long trunk support insulator device, and can maintain a constant air discharge gap.
Furthermore, it is an object of the present invention to provide a lightning-proof horn insulator device with excellent reliability that can reliably cause flash shorting due to lightning surge in the discharge gap of the re-discharge electrode.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention makes a pair of long support insulators rotatable in the track direction with respect to the support arms via hanging fittings, and The lower end cap fittings of both long trunk supporting insulators are connected and fixed in a manner that they cannot rotate relative to each other by a connecting yoke, and the connecting yoke supports a power transmission line via a wire clamp, and is provided with an arcing horn for preventing creeping flash of both of the long shaft supporting insulators, and a shield ring is provided on the connecting yoke to prevent creeping flash of both of the long shaft supporting insulators. Both long trunk support insulators are attached so as to surround the lower ends thereof with a predetermined air discharge gap, while a lightning arrester is suspended and fixed to the support arm via an adapter, and a lightning arrester is fixed to the support arm by extending from the connection yoke. The discharge electrode on the energized side and the discharge electrode on the ground side attached to the lower electrode of the lightning arrester are opposed to each other with a predetermined air discharge gap, and the tip of the discharge electrode in the energized example is connected to the shield. A method is adopted in which the ring is located outside the outer periphery of the ring when viewed in the vertical direction.

(Function) By adopting the above-mentioned means, the present invention functions as follows. ′ ■Even if the hanging type long-stem support insulator device is subjected to a force that attempts to swing in a direction perpendicular to the track direction due to wind pressure, snow accumulation, etc., the lower end cap metal fitting of the long-stem support insulator is fixed by the connecting yoke. Therefore, rotation in the same direction is prevented. Also, even if the long trunk support insulator swings in the direction of the railway line, this swing is not so thick (
Therefore, the air discharge gap between the discharge electrode on the energized side and the discharge electrode on the ground side is kept constant, and the discharge characteristics are stabilized.

In particular, the shield ring provided on the connection yoke alleviates the electric field on the charging side, but because the tip of the discharge electrode on the charging side is placed outside the shield ring, this effect can be minimized. As a result, it is possible to reliably prevent an increase in the flash voltage in the air discharge gap between the discharge electrodes, thereby ensuring that flash faults caused by lightning surges in the air discharge gap between the arcing horn and the shield ring are prevented. Prevented.

In addition, it can be easily applied to an existing hanging type long trunk support insulator device without changing the specifications of the tower body.

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 and 2.

A support arm 2 consisting of a horizontal support frame 2A and an inclined frame 2B is horizontally installed on the tower body 1, and on the horizontal support frame 2A is a hanging type long trunk support insulator device for installing a power transmission line. is installed. Since this long trunk supporting insulator device is constructed symmetrically, only one side (the left side in FIG. 1) will be explained, and the other side will be given the same reference numerals and the explanation thereof will be omitted.

A hanging metal fitting 3 is fixed to the tip of the horizontal support frame 2A with a bolt, and a connecting metal fitting 5 is connected to the hanging metal fitting 3 by a pin 4 in the direction of the track (direction perpendicular to the plane of the paper in FIG. 1). A cap fitting 8 fixed to the upper end of the long trunk support insulator 7 is connected to the connecting fitting 5 through a pin 6. Further, an inverted triangular plate-shaped connecting yoke 10 is fixed to the cap fittings 9, 9 fixed to the lower ends of both the long stem support insulators 7, 7 with bolts 11 so as not to rotate relative to each other, and the V-suspended long stem support insulators The device is prevented from rotating in a direction perpendicular to the railroad tracks (left-right direction in Figure 1).

A right angle clevis link 15 is connected to the connecting yoke 10 by a pin 14 so as to be rotatable in the direction perpendicular to the track, and a connecting link 17 is connected to the clevis link 15 by a pin 16 so as to be rotatable in the track direction. A wire clamp 20 for gripping the power transmission line 19 is connected to the link 17 by a pin 18 so as to be rotatable in the line direction. A horn-shaped discharge electrode 22 on the power supply side is horizontally supported by a bolt 21 on the connecting yoke 10 in a cantilevered manner.

An arcing horn 12 is attached to the connecting fitting 5 to prevent creeping flash of the long trunk support insulator 7. The arcing horn 12 may be formed into a ring shape so as to surround the long trunk support insulator 7.

Further, a plurality of support rods 31 (in this embodiment, two on the left and right, two on the front and back, totaling four) are cantilever-fixed to the connection yoke 10 by bolts 21 for fixing the discharge electrodes 22, and these support rods 31 A shield ring 32 is attached to the tip of the shield ring 32 so as to face the arcing horn 12 with a predetermined air discharge gap G2 and to surround the lower end of the long support insulator 7°7. , the electric field on the charging side is relaxed.

An adapter 23 is cantilevered forward and downward by a bolt at the tip of the support arm 2. An upper electrode 25 of a lightning arrester 24 having a built-in current limiting element with non-linear voltage-current characteristics is fixed to the lower surface of the tip of the adapter 23 by a bolt. The upper electrode 25 of the same lightning arrester 24,
Arcing rings 27 and 28 on the grounding side and on the charging side are attached to the lower electrode 26 to prevent creeping flash, and the mounting plate 29 fixed to the lower electrode 26 has arcing rings 27 and 28 arranged in the line direction and perpendicular to each other. A horn-shaped ground-side discharge electrode 30 is supported in a cantilevered manner so that its position can be adjusted. This discharge electrode 30
is a predetermined aerial discharge gap G1 with respect to the discharge electrode 22
They are facing each other with Further, an arc-shaped discharge end 30a is attached to the tip of the discharge electrode 30 as shown in FIG. , the discharge gap G1 is made substantially constant. The discharge gap G1 is smaller than the air discharge gap G2 of both arcing rings 12.13,
Discharge is always performed on the discharge gap Gl side.

Note that this discharge end portion 30a may be provided on the discharge electrode 22 side.

An insulated terminal 25a is provided at the upper end of the upper electrode 25 to be electrically connected to a current limiting element built into the lightning arrester 24 and to draw out the current flowing therethrough. This insulated terminal 2
5a has a function of guiding current to a counter or the like for monitoring its operating status, for example. Therefore, unless there is a special purpose for using it, it should be grounded by the shorting piece 23a.

Next, the operation of the lightning horn insulator device constructed as described above will be explained.

Now, if an abnormally high voltage is applied to the power transmission line 19 due to a lightning strike, the current will flow through the wire clamp 20 and the connecting link 17.
, the right angle clevis link 15, and the connection yoke 10, the discharge is discharged from the charging side discharge electrode 22 to the grounding side discharge electrode 30, and further flows through the current limiting element in the lightning arrester 24, and is connected to the adapter 23, the support arm 2, and is grounded via the tower body 1. Moreover, the subsequent current that occurs thereafter is blocked by the current limiting element, thereby preventing the occurrence of a ground fault.

On the other hand, when the power transmission line 19 swings in the line direction (direction perpendicular to the plane of the paper in FIG. 1) due to wind pressure or the like, both long trunk support insulators 7, 7 swing in the same direction around the pin 4. At this time, since the discharge end 30a of the discharge electrode 30 on the side of the lightning arrester 24 is formed in an arc shape, the discharge gap G1 between both discharge electrodes 22, 30 is always kept constant, and the discharge characteristics are stabilized. be able to.

Furthermore, even if the long trunk support insulators 7, 7 try to swing in the direction perpendicular to the track in FIG. On the other hand, since it is fixed by the bolt 11, this rocking is prevented, the discharge gap G1 does not change, and the discharge characteristics are stabilized.

In addition, in a hanging type suspension insulator device in which a pair of hanging insulators formed by connecting a large number of hanging insulators in series are mounted in a V-shape so as to be rotatable in the direction perpendicular to the track, the rotation in the direction perpendicular to the track is Although the angle is approximately ±30 degrees at the maximum in strong winds, the long stem support insulator device of the present invention has no rotation in the same direction, and the discharge characteristics are stabilized.

In particular, in the embodiment of the present invention, the tip of the discharge electrode 22 on the energizing side is located outside the outer periphery of the shield ring 32 when viewed from the vertical direction, so that the discharge gap G1 is sufficient to reduce the electric field of the shield ring 32. Since it is not easily affected and the increase in the flash voltage can be kept to a small level, it is possible to reliably prevent flash faults in the discharge gap G2 due to lightning surges.

Furthermore, by attaching a lightning arrester 24 to the existing hanging type long trunk support insulator device via an adapter 23 and supporting the discharge electrode 22 on the connection yoke 10, the specifications of the tower body were changed. It can be easily installed without any hassle.

In addition, in the case of an insulator device for 60,000 to 70,000 kilovolts, the weight of the lightning arrester 24 is 20 to 3" kg, so there is no problem in applying it to the existing tower body, and even in higher voltage classes, the strength of the tower is maintained. increases, so there is no problem with installation.

In addition, in this embodiment, since the lightning arrester 24 is fixed in a hanging manner, no constant bending load is applied to the insulator 24.
The device can be stabilized.

Moreover, the present invention can also be embodied as follows.

(1) As shown in FIGS. 3 and 4, approximately the center of the horizontal support frame 2A of the support arm 2, that is, both long trunk support insulators 7.
The lightning arrester 24 is suspended and fixed to a position corresponding to the center part of the lightning arrester 7 via an upwardly raised adapter 33.
The connection yoke 10 supports a horn-shaped discharge electrode 34 on the power supply side in a cantilevered manner in the line direction. In this case, rainwater and accumulated snow on the support arm 2 do not move to the lightning arrester 24 through the adapter 33, so that creepage staining and reduction in insulation strength are suppressed.

When supporting the lightning arrester 24 at the middle part of the horizontal support frame 2A, it should be placed at the center part to prevent workers from getting electrocuted due to electrostatic induction or contact during maintenance work.

It is desirable that the rims are also located on the outside.

(2) A length adjustment mechanism (not shown) is provided for the discharge electrode 22 in the vertical direction and in the direction perpendicular to the line.

(3) The relative positions of the discharge electrodes 30, 22 on the grounding side and the charging side may be changed up or down according to the actual situation.

(4) The lightning arrester 24 is hung and fixed diagonally.

Effects of the Invention As detailed above, the present invention is capable of quickly discharging even if an abnormally high voltage is applied to a power transmission line due to a lightning strike, and also reliably interrupts subsequent current, thereby preventing ground faults. It is possible to prevent flashovers caused by lightning surges, and to obtain a stable pole mounting condition. Furthermore, it can be easily applied to existing insulator equipment, and the air discharge gap can be maintained constant. This has the effect of making it possible to perform the process reliably and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying the present invention, FIG. 2 is a plan view of a ground-side discharge electrode, FIG. 3 is a front view showing a separate embodiment of the present invention, and FIG. It is a left side view of the figure. DESCRIPTION OF SYMBOLS 1... Tower body, 2... Support arm, 7... Long stem support insulator constituting a hanging type long stem support insulator device, 10... Connection yoke, 12... Arching horn, 19. ...Power transmission line, 20... Wire clamp, 22... Discharge electrode on the power supply side, 23.33... Adapter, 24... Lightning arrester, 30° 34... Discharge electrode on the grounding side, 32... Shield ring, Gl, G2... Air discharge gap.

Claims (1)

[Scope of Claims] 1. A pair of long trunk support insulators are attached to the support arm via hanging metal fittings so as to be rotatable in the track direction and in a V-shape, and lower end cap metal fittings of both long trunk support insulators are attached. are connected and fixed so that they cannot rotate relative to each other by a connecting yoke, the connecting yoke supports a power transmission line via a wire clamp, and both of the hanging fittings are provided to prevent creeping flash of both of the long trunk supporting insulators. Arcing horns are respectively provided on the connecting yoke, and a shield ring is provided on the connecting yoke to prevent creeping flash between the long shaft supporting insulators, with a predetermined air discharge gap between the arcing horns and the long shaft supporting insulators. On the other hand, a lightning arrester is suspended and fixed to the support arm via an adapter, and a discharge electrode on the energized side extending from the connection yoke and a lower part of the lightning arrester are attached to the support arm so as to surround the lower end thereof. A ground-side discharge electrode attached to the electrode is opposed to the ground-side discharge electrode with a predetermined air discharge gap, and the tip of the energized-side discharge electrode is located outside the outer periphery of the shield ring when viewed from a vertical direction. A lightning-resistant horn insulator device characterized by: 2. The lightning horn insulator device according to claim 1, wherein the mounting position of the lightning arrester with respect to the support arm is located outward from the position corresponding to the central portion of the pair of long support insulators. 3. The lightning horn insulator device according to claim 1, wherein the tip of one of the discharge electrodes on the energizing side and the grounding side is formed in an arc shape.