JP3139135B2 - Lightning arrester failure display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for indicating a failure of a lightning arrester mounted on a transmission tower and installed through a series gap from a transmission line.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing an example of the structure of an arrester mounted on a steel tower. The lightning arrester 6 includes a plurality of non-linear elements 30 mainly composed of zinc oxide stacked and stored in a container 31. The container 31 includes an insulating tube 32 and metal plugs 33A and 33B screwed to both ends of the insulating tube 32. The outer periphery of the container 31 is covered with a jacket 34 made of heat-shrinkable rubber. The laminated body of the nonlinear element 30 is
Through a compression spring 36. At the upper part of the arrester 6, the ground terminal 6B is bolted to the metal plug 33B via the upper end of the jacket 34. On the other hand, under the lightning arrester 6, the non-ground side terminal 6 </ b> A is
7, and a support bracket 37 is screwed to the metal plug 33 </ b> A via a lower end of the jacket 34 by a nut 38. A mounting bracket 6 for mounting an arcing horn described later is attached to the non-ground side terminal 6A.
C is fixed.

In FIG. 6, the inside of a container 31 is sealed by a jacket 34. A fold similar to that of a general porcelain porcelain tube is provided outside the jacket 34 to improve salt damage resistance. A power supply lead (not shown) is interposed between the presser fitting 35 and the metal plug 33A. Lightning current from the transmission line is transmitted from the mounting bracket 6C to the non-ground side terminal 6A, the support bracket 37, the metal plug 33A, the power supply lead, the holding bracket 35,
The non-linear element 30 and the metal plug 33B flow in this order, and reach the ground terminal 6B.

FIG. 7 is a side view showing an example of a configuration in which a conventional lightning arrester failure display device is mounted on a steel tower. An insulator 2 is suspended from a power transmission tower (not shown) via a support 1 (at a ground potential), and a power transmission line 3 is stretched at the tip. A pair of arcing horns 4 are provided at both ends of the insulator 2.
A and 4B are provided to form a discharge gap 5.
In addition, the lightning arrester 6 shown in FIG. Another pair of arcing horns 7A and 7B are provided on the non-ground side terminal 6A of the surge arrester 6 and the transmission line 3 to form a series gap 8.

[0005] In FIG. 7, the surge arrester 6 absorbs the overcurrent when an overvoltage has entered, and also prevents the following current from flowing from the transmission line 3. The arcing horn discharges the gap when an overvoltage such as a lightning surge enters the transmission line 3 and absorbs the overvoltage. The gap length between the discharge gap 5 and the series gap 8 is determined when the overvoltage reaches the transmission line 3.
Is set to discharge earlier. Since the gap alone does not have the ability to block the downstream flow from the transmission line 3, the ground fault condition continues and a transmission failure occurs. In order to prevent this, a lightning arrester 6 is provided via a series gap 8. When an overvoltage occurs in the transmission line 3, the series gap 8 is discharged, and the discharge current flows through the surge arrester 6. The lightning arrester 6 interrupts the discharge current instantaneously (0.5 to 1.0 cycle), so that a continuation current due to a ground fault is suppressed. In recent years, it has become more common to install the lightning arrester 6 together with the arcing horns 7A, 7B instead of the arcing horns 4A, 4B.

[0006] The failure indication of the lightning arrester 6 is very important in detecting whether or not the lightning arrester 6 is operating normally when it receives an overvoltage. If the lightning arrester 6 is out of order, the continuation current from the transmission line 3 will continue to flow as described above, making it impossible to transmit power and possibly damaging equipment connected to the system. FIG. 8 is a sectional view showing a detailed configuration of the lightning arrester failure display device of FIG. A current transformer 11 includes an iron core 14 having a conductor 10 penetrating the window, and a winding 15 wound around the iron core 14, and its output 11S
Is sent to the detector 12. The detector 12 includes an electric circuit 16 for converting the output 11S of the current transformer 11 into a pulse voltage, a container 17 having one open side, and a lid 18. In this container 17, an explosive container 2 further filled with an explosive 19.
0 and a long strip-shaped display cloth 13 are stored.

[0008] In FIG. 8, when a ground fault current flows through the conductor 10 for a predetermined time or more, the electric circuit 16 injects a pulse voltage into the powder container 20. The explosive 19 is set to explode by the injected energy, and the explosive container 20 is provided with a gas outlet 21. Since the gas blown out by the impact of the explosion pushes the cover 18 apart, the display cloth 13 jumps out of the container 17.

The apparatus shown in FIG. 8 is installed on a steel tower as shown in FIG. The ground terminal 6B of the surge arrester 6 and the support 1 are conductively connected by a conductor 10, and a current transformer 11 is interposed in the conductor 10. The output of the current transformer 11 is sent to the detector 12, and when the lightning arrester 6 fails, the display cloth 13 hangs down as shown in FIG. An observer checks the presence or absence of the display cloth 13 from below the steel tower with binoculars, thereby detecting a failure of the lightning arrester 6. The insulating spacer 9 is provided to insulate between the ground terminal 6B and the support 1 so that all the current flowing from the ground terminal 6B to the support 1 passes through the conductor 10. It is good also as a structure which penetrates the current support 11 entirely. However, in this case, the window of the iron core 14 of the current transformer 11 needs to be enlarged, and the physique of the current transformer 11 increases.

[0009]

However, the above-mentioned conventional fault display device has a problem that it needs to be replaced in three to five years because of the use of explosives.
That is, unless the seal in the explosive container is strictly changed, the explosive performance of the explosive in the detector changes due to chemical change with time. The life of the explosive can be considerably maintained if it is tightly sealed with a metal like a bullet, but an electrode (not shown) for injecting a pulse voltage into the explosive container 20 is inserted as shown in FIG. It is necessary, and an outlet 21 is also provided. Due to such a complicated structure, it is very difficult to completely seal the explosive container 20 from the outside air. Therefore, the reliability was not guaranteed unless the detector 12 was replaced in three to five years.

Further, the conventional device requires an electric circuit, so that not only the configuration is complicated, but also the mounting to a steel tower is not easy. In the existing lightning arrester, it is necessary to modify the support bracket 1 and the insulating spacer 9 and the conductor 10
Also needed to be added. Further, since the insulating spacer 9 also receives the load of the lightning arrester 6, it is necessary to configure the insulating spacer 9 so that its mechanical strength can be sufficiently ensured. for that reason,
Attachment of the conventional fault display device to a steel tower required considerable modification costs.

An object of the present invention is to provide a device which has a long life and can be easily attached to a steel tower by using a sublimable object.

[0012]

According to the present invention, there is provided a lightning arrester provided with a laminated body of a plurality of non-linear resistance elements in a container and installed from a transmission line via a series gap. Device for indicating the failure of, having conductivity and electrically connected in series to the laminate,
A sublimable object that directly changes from a solid state to a gas when the temperature rises due to a ground fault current from the transmission line, and a movable unit that constantly presses the sublimable object and is energized when the sublimable object is vaporized; It is assumed that the built-in display body pops out by being hit by the movable portion, and the display portion displays that the lightning arrester has failed.

[0013] In this configuration, the sublimable object and the movable part are housed inside the container, the display part is attached to the outside of the container, and the movable part penetrates a through-hole provided in the container. And a hitting unit for hitting
Furthermore, the sublimable object is a polycaproamide (Polycaproamid).
de) is made of a conductive composite material modified to be conductive.

[0014]

According to the present invention, there is provided a sublimable object connected in series to a nonlinear element, a movable portion which is energized when the sublimable object is vaporized, and a display portion provided with a display which is protruded by the movable portion. Be composed. If the lightning arrester fails, the temperature of the sublimable object rises due to a ground fault current from the transmission line, and the sublimable object vaporizes. When the sublimable object is vaporized, the movable portion loses the supporting object because there is no one that has been constantly pressed, and starts the acceleration motion. The display unit is hit by the urging of the movable unit, and the display unit pops out a display body such as a display unit that indicates a failure of the lightning arrester. The failure of the lightning arrester can be confirmed by visually checking the presence or absence of this display from the bottom of the tower.

Further, the sublimable object and the movable body are built in the container, and the display unit is attached to the outside of the container. The movable portion includes a hitting portion that penetrates a through hole provided in the container and hits the display portion. With this configuration, since all the fault display devices are mounted on the lightning arrester side, mounting on the tower becomes easy. Further, the sublimable object is formed of a conductive composite material obtained by modifying polycapramide to be conductive. Accordingly, even if the sublimable object is constantly subjected to the pressing force, it is mechanically strong, and the reliability of the fault display device is improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a sectional view of a main part showing a configuration of a fault arrester fault display device according to an embodiment of the present invention. The failure display device includes a movable section 44, a sublimable object 45, and a display section 48. Metallic movable portion 4 into which impact portion 47 made of an insulating cylinder is screwed
4 and a ring-shaped sublimable object 45 are housed in the container 40 of the lightning arrester 60. On the other hand, the display unit 48 includes a hanging string 49 whose one end is fixed to the support bracket 37, a display cloth 50 which is a long band-shaped cloth, and a case 51 which stores the display cloth 50 in a folded state. It is adhered to a metal stopper 43B on the lower side of 40. In the metal stopper 43B,
A through hole is provided and the hitting portion 47 is inserted. Also,
Packing 46 for sealing the inside of the container 40 is
It is arranged between the hitting portion 47 and the metal 43B. Further, a slight gap is secured between the tip of the hitting portion 47 and the case 51. The compression spring 42 constantly presses the non-linear element 30 via the insulating ring-shaped insulating retainer 39, and the compression spring 41 always presses the sublimable object 45 via the movable portion 44. A power supply lead (not shown) is interposed between the movable portion 44 and the holding member 35. The other configuration is the same as that of the lightning arrester 6 of FIG. The detailed description is omitted by using the same reference numerals for the same parts.

In FIG. 1, the sublimable object 45 is a solid that is always conductive. When a large current flows through the sublimable body 45, the sublimable body 45 is heated by the resistance loss, and when it reaches the sublimation temperature, it is directly vaporized from a solid state.
An example of this type of material is conductive plastic. In recent years, the technology of modifying plastic materials to make themselves conductive for the purpose of protecting ICs from destruction due to static electricity or charging has been greatly advanced. The reforming method is formed by compounding a conductive carbon black, a metal filler and the like with a plastic.

Such conductive composite materials are mainly used in the IC-related packaging field (magazines, trays, containers, racks, cardboards, etc.).
Mechanically strong polycapramide as a material applicable to
(Product name is Nylon 6, domestically called Alamine)
Are made conductive (for example, DAIEL (trade name)
EC EX1905A, manufactured by Dainippon Ink and Chemicals, KK).
This material has a surface resistance of 8.6 kΩ and is conductive. The tensile strength is as strong as 7.7 kg / cm ² . The compressive strength is also equal to or higher than the value of the tensile strength, and does not deform even when pressed constantly.
When the polycapramide reaches the sublimation temperature, CO ₂ , CH
_4, decomposed into low molecular weight gases such as NO _2.

In FIG. 1, the ground fault current due to lightning is shown by the mounting bracket 6C, the non-ground side terminal 60A, the support bracket 37, the metal plug 43B, the sublimable object 45, the movable portion 44, the power supply lead (not shown), , The non-linear element 30 in this order. The size of the sublimable object 45 is formed so that the lightning arrester 60 itself fails and sublimates when the ground fault current flows for a predetermined time or more. When the sublimable object 45 evaporates, the movable portion 44 is urged downward by the compression spring 41. At that moment, the striking section 47 slides and strikes the case 51. Due to this impact, the adhesion between the metal stopper 43B and the case 51 is removed, and the case 51 falls downward. This failure display device has a long service life because it does not use any explosives as in the prior art.

FIG. 2 is a sectional view showing a state where the sublimable object 45 shown in FIG. 1 is vaporized. The movable section 44 is pushed downward, and the display section 48 is moved from the support fitting 37 to the hanging string 49,
The display unit 50 is connected to the case 51 and hangs down. The case 51 is fixed to one end of the display cloth 50 so as not to fall to the ground. By observing the presence or absence of the display cloth 50, the failure of the lightning arrester 60 can be confirmed.

FIG. 3 is a side view showing a configuration in which the device of FIG. 1 is mounted on a lightning arrester installed on a steel tower. The lightning arrester 60 is directly attached to the support bracket 33, and a failure display device is provided at the non-ground side terminal 60 </ b> A of the lightning arrester 60. Therefore, the insulating space on the steel tower, which is necessary for installing the conventional fault display device, is unnecessary. Even if a new fault display device is provided, there is no need to modify the tower. Since all the fault display devices are mounted on the lightning arrester side, installation on the steel tower is only bolting of the ground terminal 6B, and installation work on site is easy.

FIG. 4 is a sectional view of a main part showing the configuration of a lightning arrester fault display device according to another embodiment of the present invention. The failure display device includes a movable section 52, a sublimable object 53, and a display section 58.
Consisting of A metallic movable portion 44 into which a striking portion 57 formed of an insulating cylinder is screwed, and a ring-shaped sublimable object 53 are accommodated in a lightning arrester 60 container 40. On the other hand, the display unit 58 includes the hanging string 5 having one end fixed to the support fitting 37.
9, a display cloth 61 which is a long band-shaped cloth, and a case 62 which folds and stores the display cloth 61. The case 61 is adhered to the nut 38. A through hole is provided in the metal stopper 43B, and the hitting portion 57 is inserted. A slight gap is secured between the tip of the striking portion 57 and the case 61.
The compression spring 55 constantly presses the nonlinear element 30 via the metal presser 54, the sublimable object 53, and the movable portion 52. A power supply lead (not shown) is interposed between the metal presser 54 and the metal plug 43B. Striking unit 5
A holding plate 64 is attached to a lower end of 7 by a nut 63. Another compression spring 56 is interposed between the holding plate 64 and the metal plug 43B. Other configurations are the same as those of FIG.

The material, size and role of the sublimable object 53 in FIG. 4 are the same as those described in FIG.
In FIG. 4, the ground fault current due to lightning is shown in FIG. 4 with the mounting bracket 6C, the non-ground side terminal 60A, the support bracket 37, the metal plug 43B, a power supply lead (not shown), a metal presser 54,
3, the movable portion 52, the presser fitting 35, and the nonlinear element 30 flow in this order. When the lightning arrester 60 breaks down and the sublimable object 53 evaporates, the balance between the compression springs 55 and 56 is lost, and the movable part 52 is urged downward. At that moment, the striking section 57 slides and strikes the case 61. Due to this impact, the adhesion between the case 61 and the nut 38 is released, and the case 61 falls downward.

FIG. 5 is a cross-sectional view of a main part showing a state when the sublimable object 53 of FIG. 4 is vaporized. The movable section 52 is pushed downward, and the display section 58 is moved from the support fitting 37 to the hanging string 59,
It is connected to the display cloth 61 and the case 62 and hangs down. By observing the presence or absence of the display cloth 61 by the observer, the failure of the lightning arrester can be confirmed. The configuration in which the device of FIG. 4 is installed in a lightning arrester on a steel tower is exactly the same as that of FIG.

[0025]

As described above, the present invention provides a sublimable object having conductivity and connected in series to a nonlinear element,
A movable part that is energized when the sublimable object is vaporized,
A display unit provided with a display body such as a display cloth protruding from the movable unit. When the lightning arrester breaks down, the display on the display unit pops out, so that the presence or absence of the display can be confirmed from the lower part of the tower. Therefore, the explosive required in the conventional device is not required, and the device has a long life.

Further, in the apparatus of the present invention, the sublimable object and the movable body are built in the container, and the display unit is attached to the outside of the container. The movable portion includes a hitting portion that penetrates a through hole provided in the container and hits the display portion. With this configuration,
Since all the fault display devices are mounted on the lightning arrestor side, the insulating spacer on the steel tower, which is necessary for installing the conventional fault display devices, becomes unnecessary. Since it is not necessary to support the entire lightning arrester with insulating spacers, it is mechanically robust. Also, when a new fault display device is provided, there is no need to remodel the tower. Attachment to a steel tower is performed only by bolting the ground-side terminal 6B, and installation work on site is easy.

Further, the sublimable object is formed of a conductive composite material obtained by modifying polycapramide to be conductive. This makes it possible to provide a highly reliable failure display device that is mechanically strong even if the sublimable object is constantly pressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a configuration of a lightning arrester failure device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a state when the sublimable object in FIG. 1 is vaporized.

FIG. 3 is a side view showing a configuration in which the device of FIG. 1 is mounted on a lightning arrester installed on a steel tower.

FIG. 4 is a sectional view of a main part showing a configuration of a lightning arrester failure device according to a different embodiment of the present invention;

FIG. 5 is a sectional view of a main part showing a state when the sublimable object in FIG. 4 is vaporized.

FIG. 6 is a sectional view showing a configuration example of a lightning arrester to be attached to a steel tower.

FIG. 7 is a side view showing a configuration example when a conventional lightning arrester failure display device is mounted on a steel tower.

FIG. 8 is a sectional view showing a detailed configuration of a failure device of the arrester of FIG. 7;

[Explanation of symbols]

 2 Insulator 3 Transmission line 4A Arcing horn 4B Arcing horn 7A Arcing horn 7B Arcing horn 5 Discharge gap 8 Series gap 60 Arrestor 60A Non-ground terminal 6C Mounting bracket 33 Supporting bracket 37 Supporting bracket 30 Non-linear element 32 Insulating cylinder 43B Metal stopper 40 39 insulating press 54 metal press 35 press fitting 34 jacket 38 nut 63 nut 44 movable section 52 movable section 45 sublimable object 53 sublimable object 46 packing 47 hitting section 57 hitting section 48 display section 58 display section 49 hanging string 59 hanging string REFERENCE SIGNS LIST 50 display cloth 61 display cloth 51 case 62 case 64 holding plate 41 compression spring 42 compression spring 55 compression spring 56 compression spring

Claims (3)

(57) [Claims] An apparatus for displaying a failure of a lightning arrester installed through a series gap from a transmission line by housing a laminated body of a plurality of non-linear resistance elements in a container, wherein the laminated body has conductivity. The sublimable object which is electrically connected in series to a gas and which is directly converted from a solid state to a gas when the temperature rises due to a ground fault current from the power transmission line. A movable part to be energized,
A failure display device for an arrester, characterized by comprising a display portion for displaying that the arrestor has failed by popping out a built-in display body by being hit by the movable portion. 2. A container according to claim 1, wherein the sublimable object and the movable portion are housed inside the container, the display portion is attached to the outside of the container, and the movable portion is provided in the container. A lightning arrester fault display device, comprising: a hitting portion that penetrates the display portion and hits the display portion. 3. The lightning arrester fault display device according to claim 1, wherein the sublimable object is formed of a conductive composite material obtained by modifying polycapramide to be conductive.