JPH0554912B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention quickly discharges high voltage caused by lightning when it is applied to a power transmission line, and reliably interrupts the subsequent arc that occurs afterward. The present invention relates to the operation of a lightning arrester insulator and a failure display device in a lightning horn insulator device for power transmission lines for preventing electrical faults.

(Prior Art) Conventional operation display devices for lightning arresters placed on power transmission lines have used a mechanical dial counter type that is activated by lightning surge current. Furthermore, there was no special equipment for failure indication, and confirmation was made by visually observing external damage to the lightning arrester.

(Problems to be Solved by the Invention) However, since the conventional dial counter type operation display device uses only instantaneous lightning surge current, the operating energy is small and the display section cannot be enlarged. Therefore, there was a problem in that it was impossible to check without climbing up the tower body and going to the attachment point at the end of the arm. Furthermore, since the conventional operation display device is mounted near the lightning arrester, there is a problem in that it is not possible to replace the old device with a new one while the line is live.

An object of the present invention is to provide a lightning arrester insulator operation and failure display device in a lightning horn insulator device that solves the above-mentioned problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention supports a power transmission line via a hanging insulator on a support arm of a power transmission tower body, and also provides a lightning arrester insulator. In a lightning protection horn insulator device in which a discharge electrode attached to the hanging insulator side and a discharge electrode of the lightning arrester face each other with a predetermined air discharge gap, it is possible to detect a lightning surge current flowing through the lightning arrester. operating current sensor,
A fault current sensor that can detect the fault current that occurs when the lightning arrester fails, and a fault current sensor that is installed on the power transmission tower body.
Further, it is constituted by an operation display section and a fault display section each containing a built-in gunpowder that is activated based on the operation signal and fault signal output from the operating current sensor and the fault current sensor via cables, respectively.

(Operation) This invention operates as follows by employing the above means.

When a lightning surge current that exceeds expectations is applied to a power transmission line due to a large-scale lightning strike, this current is discharged from the discharge electrode on the energized side to the discharge electrode on the lightning arrester side, and is isolated from the nonlinear resistance element in the lightning arrester. It flows through the terminal and ground conductor, and then flows toward the tower body and is discharged. Then, an operating current sensor capable of detecting lightning surge current detects it, and an operating signal is input from the cable to an operation display section, which displays the operation of the lightning arrester. In addition, when a large fault current flows due to deterioration of the lightning arrester and the inability to interrupt the follow-on current after a lightning surge current, an abnormality is detected by a fault current sensor that can detect this fault current, and this fault signal is sent to the cable. The signal is then sent to the fault display section, where a fault display is performed.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

The insulator device of this embodiment, as shown in FIG. 3, includes an insulator that extends horizontally at the tip of the support arm 2 of the tower body 1 and is supported rotatably in the vertical direction. Link mechanism 3 and the same attachment link mechanism 3
A hanging insulator 5 that is suspended from one end and supports the electric wire 4
, a lightning arrester 6 fixedly suspended from the tip of the attachment link mechanism 3, and an operation and failure display device 7 that displays the number of times the lightning arrester 6 has operated and failures.

Therefore, to explain the mounting link mechanism 3 with reference to FIGS. 3 and 4, the support arm 2
A bracket 9 is tightened and fixed to the lower surface of the tip by a bolt 8, and an H-shaped suspension link 10 is attached to a shaft support 9a of the bracket 9 so as to be rotatable in a direction perpendicular to the track by a shaft 11. There is. A lower movable support arm 1 is connected to the suspension link 10 by a shaft 12.
3 are connected, and both ends of an upper movable support arm 15 are connected by shafts 16 and 11 between a support frame 14 welded to the upper surface of the movable support arm 13 and the shaft support 9a of the bracket 9. ing.

The lower support arm 13 includes a pair of arm pieces 17 connected to the shaft 12, a rectangular frame 18 welded to the tips of the arm pieces 17, and a lightning arrester welded to the tips of the frame 18. and a mounting plate 19 provided with mounting holes 19a for mounting 6. Further, the upper movable support arm 15 includes a U-shaped frame 20 connected to the shaft 11, and a U-shaped frame 20 connected to the shaft 11.
0 with a nut 21 so that the position can be adjusted,
and a length adjustment rod 22 connected to said shaft 16.
It is made up of.

On the other hand, a right-angled clevis 23 is connected to the lower end of the suspension link 10 constituting the mounting link mechanism 3 so as to be rotatable in the direction perpendicular to the track by the shaft 12, and a shaft 24 is provided at the lower part of the right-angled clevis 23 so as to be rotatable in the direction perpendicular to the track. The hanging insulator 5 is rotatably connected to the shaft 26 through the horn mounting bracket 25 which is rotatably connected to the shaft 26.
are connected by

A parallel clevis 27 is attached to the lower part of the hanging insulator 5, and a horn mounting bracket 29 is connected to the parallel clevis 27 by a shaft 28 so as to be rotatable in the line direction, and below the horn mounting bracket 29, a power transmission line is connected. A suspension clamp 30 that grips 4 is also connected by a shaft 28 so as to be rotatable in the track direction. Further, an arc horn 31 serving as a discharge electrode is attached to the horn fitting 29. Both horn mounting brackets 25,
An arc horn 32 is attached to 29 to prevent creeping flash of the hanging insulator 5.

The mounting plate 1 constituting the mounting link mechanism 3
A mounting flange 33 of the lightning arrester 6 is fixed to 9 with bolts, and a discharge electrode 35 facing the arc horn 31 with a predetermined air discharge gap G is attached to the lower electrode 34. This lightning insulator 6
A resistance element (not shown, but hereinafter simply referred to as a nonlinear resistance element) made of zinc oxide or the like and having nonlinear voltage-current characteristics is housed inside.

Next, the operation of the lightning arrester 6 and the failure display device 7 will be explained. As is well known, when a lightning surge current (lightning impulse current) is applied to a power transmission line,
This current reaches an extremely high voltage in a short period of several microseconds, and an operating current flows that naturally decays and disappears in several tens to hundreds of microseconds. In addition, when a current that exceeds the specified operating current (lightning surge current) acts on a power transmission line and the lightning arrester is damaged and becomes electrically conductive, a follow-on current flows following the lightning surge current, or the lightning arrester In the unlikely event that the element deteriorates, the power level will vary from the order of milliamperes or 1 ampere when the element is normal to several tens or several amps.
A large amount of commercial frequency current, that is, fault current, rapidly increases to the order of 1000 amperes. This invention detects the operation and fault currents using a sensor and displays them on the operation and fault display device 7, as follows. A grounding conductor 36 made of a conductive material is integrally formed on the upper part of the support frame 14, and its tip end is electrically connected to an insulating terminal 37 provided at the upper end of the lightning arrester 6. The grounding conductor 36 is provided with an operating current sensor 38 that includes a current transformer that can detect the operating current flowing through the conductor 36, and a fault current sensor 38 that includes a current transformer that can detect the fault current that occurs when the lightning arrester 6 fails. A sensor 39 is attached.

On the other hand, the tower body 1 has a plurality of (in this embodiment, four
and a failure display section 44 that is activated by a signal from the current sensor 39 when the lightning arrester 6 is malfunctioning due to deterioration or the like and cannot cut off the follow-on current that occurs following the lightning surge current. It is installed. Each of the display parts 43 and 44 has gunpowder (not shown) inside, a display piece 45 that pops out to the outside due to the explosive force of the gunpowder, and a display band 46 made of resin or synthetic fiber that pops out and hangs down (for example, a width of 10 mm).
cm, length approximately 50cm). It is desirable that the display piece 45 and the display band 46 have different colors for each of the display sections 43 and 44, and that the display band 46 of the failure display section 44 has a unique color.

The cables 41, 42 are removably connected to the display sections 43, 44 by watertight plugs 47, as shown in FIG. This plug 47
The male terminal 48 on the cable side is connected to the display parts 43 and 44.
Insert into the female terminal 49 on the side and connect the cables 41, 42.
A gasket 52 is interposed between the end face of the display unit 43 and the mounting tube 51 formed in the case 50 of the display parts 43 and 44,
It is constructed by screwing a cap-shaped lid 53 onto the mounting tube 51.

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

When a surge voltage caused by a lightning strike flows through the electric wire 4, this voltage flows through the arc horn 31 and the discharge electrode 35.
is discharged in the air discharge gap G between the lightning arrester 6
A non-linear resistance element built in, an insulated terminal 37,
It flows through the ground conductor 36, the attachment link mechanism 3, and the support arm 2 to the tower body and is grounded. Moreover, the subsequent arc generated thereafter is blocked by the above-mentioned aerial discharge gap G and the nonlinear resistance element.

When the lightning surge current flows through the ground conductor 36, this current is detected by the operating current sensor 38, and is input from the cable 41 to the operation display section 43, where it is determined that the lightning arrester 6 has been operated, and an operation display is performed. The gunpowder in the section 43 is ignited, and the display piece 45 is projected by the explosive force of the gunpowder, and the display band 46 pops out and hangs down, allowing the operation to be confirmed from the ground.

Every time this lightning surge current enters the lightning arrester 6, the operation display section 43 is activated as described above.
It is confirmed how many times the lightning surge current has entered the lightning arrester 6.

In addition, if the nonlinear resistance element of the lightning arrester 6 deteriorates due to repeated lightning surge voltages that exceed expectations,
Since the follow-up current after the lightning surge current cannot be interrupted, this is detected by the fault current sensor 39, and a fault signal is sent to the fault display section 44 via the cable 42.
Since the input is input to and activated, failures can be confirmed from the ground.

Effects of the Invention As detailed above, in this invention, the operation display section and the failure display section, which are displayed using the explosive power of gunpowder, are attached to the tower body on the ground side. can be set arbitrarily, and therefore the content of the display can be easily checked from a point away from the tower body, whether it is an operation display or a failure display, allowing prompt response. There is also an excellent effect that the replacement work for both display parts can be performed while the wires are live.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the operation and failure display device of a lightning arrester according to an embodiment of the present invention, FIG. 2 is a sectional view of a water plug, and FIG. 3 is a lightning horn insulator of the present invention. FIG. 4 is a front view showing the entire device, and FIG. 4 is an exploded perspective view of the vicinity of the mounting bracket. 1... Tower body, 2... Support arm, 3... Mounting bracket, 4... Power transmission line, 5... Hanging insulator, 6... Lightning arrester, 7... Operation and failure display device, 37... Insulation Terminal, 38... Operating current sensor, 39... Fault current sensor, 41, 42... Cable, 43...
Operation display section, 44...failure display section, 45...display piece, 46...display band, 47...water plug.

Claims (1)

[Scope of Claims] 1. A power transmission line is supported via a hanging insulator to a support arm of a power transmission tower body, and a lightning arrester is attached, and a discharge electrode and a lightning arrester are attached to the side of the hanging insulator. In a lightning horn insulator device that faces a discharge electrode with a predetermined air discharge gap, an operating current sensor capable of detecting a lightning surge current flowing through the lightning arrester and a fault current that occurs when the lightning arrester fails. an operation display incorporating a fault current sensor and a gunpowder mounted on a power transmission tower body and activated based on an operation signal and a fault signal output from the operating current sensor and the fault current sensor via cables, respectively; 1. A lightning arrester insulator operation and failure display device in a lightning horn insulator device, characterized in that the lightning arrester insulator is comprised of a lightning protection horn insulator device and a failure display portion. 2. A device for indicating the operation and failure of a lightning arrester in the lightning horn insulator device according to claim 1, wherein the operating current sensor and the fault current sensor are current transformers attached to a ground conductor routed from an insulated terminal of the lightning arrester. .