JP2011187375A - Lightning arrester for power transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightning arrester for power transmission in which a serial gap is prevented from being affected by the external environment and stable discharge characteristics can be obtained, and which can control and cut off a dynamic current generated after discharging. <P>SOLUTION: The lightning arrester for power transmission includes a support insulator and a lightning protection part which are installed on a support arm of a steel tower and support a transmission wire; a discharge part connected to the lower part of the lightning arrester; a lightning arrester side discharge electrode installed between the lightning protection part and the discharge part; a charging side discharge electrode 6 installed at the lower part of the supporting insulator and the discharge part; and a discharge electrode installed at the upper end of the support insulator and is opposed to the end part of the charge side discharge electrode 6. The discharge part has an insulator tube 15, having a discharge space 18 formed inside; and a serial gap is formed between the lightning arrester side discharge electrode and the charge side discharge electrode 6 in the insulator tube 15. The upper end of the insulator tube 15 is closed and the lower end has the discharge space 18 open to the outside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lightning arrester for power transmission installed on a steel tower in a power transmission system.

  Generally, in a power transmission system, a lightning arrester for power transmission installed on a steel tower is effective as a lightning surge intrusion prevention and a measure against instantaneous interruption. In today's information-oriented society, it is necessary for the lightning arrester to operate reliably during lightning strikes on the power transmission system in order to ensure power outage prevention.

  In this lightning arrester for power transmission, a lightning protection element containing zinc oxide is attached to a steel tower in parallel with the transmission line support insulator series. In recent years, it is necessary to re-transmit power even after the surge arrester body is destroyed due to surge exceeding its processing capacity. Therefore, power surge arresters equipped with an air gap (series gap) in series with the surge arrester body have become mainstream. It has become.

FIG. 9 is a schematic view showing a conventional lightning arrester for power transmission with a series gap.
The power transmission line 1 is supported via a support insulator 2 attached to the tip of a support arm 5 of a steel tower. A pair of arc horns 3 having a gap length G are attached to both upper and lower ends of the support insulator 2 so as to face each other. The arc horn 3 energizes a lightning current between the horns to prevent the support insulator 2 from being destroyed. However, with this alone, a ground fault current continues to flow between the arc horns 3.

  Therefore, the lightning protection element part 4 and the series gap 9 are provided on the other side of the steel tower via the mounting bracket 7. The charging-side discharge electrode 6 electrically connected to the power transmission line 1 is attached to the lower end portion of the support insulator 2, and the lightning protection element-side discharge electrode 8 is attached to the lower end portion of the lightning protection element portion 4. The end portion of the charging-side discharge electrode 6 is one of the opposing discharge electrodes of the arc horn 3. The series gap 9 has a gap length g shorter than the gap length G of the arc horn 3 between the lightning protection element side discharge electrode 8 and the power application side discharge electrode 6. The series gap 9 is not discharged even when a normal operation voltage is applied, but is discharged when an excessive lightning surge occurs, and the voltage non-linear characteristics of the lightning protection element unit 4 can block the arc continuity and prevent an instantaneous power failure (for example, Patent Document 1).

  However, in the above-described lightning arrester with a series gap, the gap length g of the series gap 9 changes due to vibrations of wind or the like, and the required discharge characteristics are not ensured. There is a problem of high risk. Furthermore, due to severe fouling on the jacket of the lightning protection element portion 4, an excessive current flows through the series gap 9, and the interruption of the arc continuity may fail.

  Therefore, there is known a lightning arrester for power transmission that has a structure in which the series gap 9 is not exposed, the electrode is opposed to the inside of the insulating container and cut off from the outside air, and the length is prevented from changing due to the influence of wind or the like. (See Patent Document 2).

10A and 10B are diagrams showing a lightning arrester for power transmission provided with a discharge part disclosed in Patent Document 2, wherein FIG. 10A is a schematic view, and FIG. 10B is a cross-sectional view of the discharge part.
A power transmission line 1 is supported on a steel tower via a support insulator 2, and a series connection body of a discharge part 10 having a lightning protection element part 4 and a series gap is connected in parallel to the support insulator 2. The discharge unit 10 evacuates the inside of an insulating container 31 having an end plate attached to an insulating cylinder, or encloses an insulating gas therein, and provides a lightning protection element side discharge electrode 32 and a charging side discharge electrode electrode 33 on both end plates. It is configured to be opposed and supported.

Japanese Patent Laid-Open No. 9-17549 JP 7-57576 A JP 2008-251715 A

  In the lightning arrester for power transmission provided with a discharge part having a series gap as in the above-described conventional example, the electrode is opposed to the inside of the insulating container and shut off from the outside air, but after discharge when the pressure in the insulating container rises There is a case where the internal gas cannot be released and the continuity cannot be suppressed and cut off.

  An object of the present invention is to provide a lightning arrester for power transmission in which a series gap is not affected by an external environment, a stable discharge characteristic can be obtained, and a continuity generated after discharge can be reliably suppressed and cut off. .

  In order to solve the above-mentioned problems, a lightning arrester for power transmission according to the present invention is attached to a support arm of a steel tower and supports a power insulator and a lightning arresting element part supporting a power transmission line, and a discharge part connected to a lower part of the lightning arresting element part. , A lightning protection element side discharge electrode provided between the lightning protection element part and the discharge part, a power application side discharge electrode attached to the lower part of the support insulator and the discharge part, and attached to the upper end of the support insulator A discharge electrode facing the end of the voltage-applying discharge electrode, and the discharge part includes an insulating rod that forms a discharge space therein, and the lightning protection element-side discharge electrode inside the insulating rod. In the lightning arrester for power transmission in which a series gap is formed between the electric discharge side discharge electrode and the power application side discharge electrode, the upper end of the insulating rod is sealed and the lower end opens the discharge space to the outside.

  According to the present invention, since the series gap of the discharge part is not affected by the external environment, it is possible to obtain a stable discharge characteristic, and in the event of an excessive lightning surge, an air gap is generated between the counter electrodes in the discharge part. Even if the discharge occurs and the pressure in the discharge part space rises, the continuous gas can be reliably suppressed and cut off by discharging the internal gas from the lower end of the discharge part.

Schematic which shows the lightning arrester for power transmission in Embodiment 1 of this invention. Sectional drawing of the discharge part of the lightning arrester for the power transmission. Sectional drawing of the discharge part of the lightning arrester for power transmission in Embodiment 2 of this invention. Sectional drawing of the discharge part of the lightning arrester for power transmission in Embodiment 3 of this invention. The front view of the lightning arrester element part and discharge part of the lightning arrester for power transmission in Embodiment 4 of this invention. Sectional drawing of the discharge part of the lightning arrester for power transmission in Embodiment 5 of this invention. Sectional drawing of the discharge part of the lightning arrester for power transmission which is the other example in Embodiment 5 of this invention. The front view of the discharge part of the lightning arrester for power transmission in Embodiment 6 of this invention. Schematic which shows the conventional lightning arrester for power transmission with a series gap. Schematic which shows the lightning arrester for power transmission provided with the conventional discharge part, and sectional drawing of a discharge part.

  Hereinafter, an example of an embodiment of the present invention will be specifically described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the member same as the prior art example shown in FIG. 9, 10, and description is abbreviate | omitted. In the second and subsequent embodiments, the description of the points common to the first embodiment will be omitted.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating a lightning arrester for power transmission according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a discharge portion of the lightning arrester for power transmission.
The lightning protection element part 4 has a polymer jacket 23, and the discharge part 10 is located below the lightning protection element part 4 and is connected in series. A lightning protection element side discharge electrode 8 is provided between the lightning protection element part 4 and the discharge part 10. On the support insulator 2 and the lower end portion of the discharge portion 10, the power application side discharge electrode 6 electrically connected to the power transmission line 1 is attached. The discharge part 10 includes an insulating soot tube 15, a projecting electrode 16 which is a part of the lightning protection element side discharge electrode 8, a projecting electrode 17 which is a part of the charging side discharge electrode 6, and an internal discharge space 18. And has a discharge gap corresponding to a conventional series gap. The insulating soot tube 15 is composed of a polymer jacket 11, a pressure-resistant insulating cylinder 12, and insulating end plates 13 and 14 at both ends. The protruding electrode 16 is integrated with or separate from the lightning protection element side discharge electrode 8 main body, and in the case of a separate body, it is electrically connected. Similarly, the projecting electrode 17 is integral with or separate from the main body of the charging-side discharge electrode 6, and is electrically connected in the case of a separate body.

The projecting electrode 16 is inserted into the upper end of the insulating soot tube 15 and fixed to the insulating end plate 13, and the upper end of the insulating soot tube 15 is sealed. The protruding electrode 17 is inserted into the lower end of the insulating soot tube 15, and a certain gap is maintained between the protruding electrode 17 and the insulating end plate 14. This gap has a vent 20 ₁ for opening the discharge space 18 to the outside. Further, the lower end portion of the insulating soot tube 15 is supported by the power-applying discharge electrode 6 through a metal support rod 19.

With the above configuration, since the position of the insulating rod 15 is fixed by the support rod 19 and the lightning protection element side discharge electrode 8, a predetermined discharge gap is maintained between the projecting electrodes 16 and 17. That is, the length of the discharge gap does not vary with respect to vibrations such as wind.
Moreover, since the discharge gap is arrange | positioned in the discharge space 18 inside the insulated soot tube 15, the discharge part 10 can prevent the short circuit by the penetration | invasion etc. of birds and beasts.

In this way, since the discharge gap is not affected by the external environment, it is possible to obtain stable discharge characteristics. Moreover, upon the occurrence of an excessive lightning surge, the aerial discharge between the projecting electrodes 16 and 17 of the discharge unit 10 is generated, even if the pressure in the discharge space 18 increases, the internal gas vent 20 ₁ The continuity can be reliably suppressed and cut off by discharging from the air.
As described above, according to the present embodiment, the discharge characteristics of the discharge gap are stabilized, and the operation performance of the lightning arrester for power transmission can be improved.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the discharge part in Embodiment 2 of the present invention.
In the discharge part 10 of the first embodiment, instead of the projecting electrode 17 and the insulating end plate 14 inserted into the lower end of the insulating soot tube 15 shown in FIG. 21 is disposed, and the ring-shaped electrode 21 is electrically connected to the power-applying discharge electrode 6 body via the support rod 19. Central portion of the ring-shaped electrode 21 is a vent 20 ₂ for opening the discharge space 18 to the outside. Furthermore, the pressure | voltage resistant insulation cylinder 12 has an internal diameter of the grade which closely_contact | adheres to the circumference | surroundings of the protruding electrode 16 inserted in the upper end.

With the above configuration, when an excessive lightning surge occurs, the lightning arrester operates by being discharged between the protruding electrode 16 and the ring electrode 21 along the discharge space 18. During discharge, even if the pressure in the discharge space 18 increases, can be reliably suppressed blocking the connection flow by releasing internal gas from the vent 20 _2. Since simple creeping discharge is used, the inner diameter of the discharge space 18 can be shortened. That is, the lightning arrester can achieve further downsizing.

(Embodiment 3)
FIG. 4 is a cross-sectional view of the discharge part in Embodiment 3 of the present invention.
In the discharge part 10 of Embodiment 1, instead of the projecting electrode 17 and the support rod 19 inserted into the lower end of the insulating soot tube 15 shown in FIG. 22 is inserted, and the hollow protruding electrode 22 is electrically connected and fixed to the main body of the charging-side discharge electrode 6. The hollow portion of the hollow protruding electrode 22 is a vent 20 ₃ for opening the discharge space 18 to the outside.

With the above configuration, when an excessive lightning surge occurs, air discharge is generated between the projecting electrode 16 at the closed end and the hollow projecting electrode 22 at the open end inside the discharge space 18 to operate the lightning arrester. To do. During discharge, even if the pressure in the discharge space 18 increases, can be reliably suppressed blocking the connection flow by releasing internal gas from the vent 20 _3. Further, since the support rod 19 can be omitted, the manufacturing cost can be reduced.

(Embodiment 4)
FIG. 5 is a configuration diagram of a lightning protection element portion and a discharge portion in Embodiment 4 of the present invention.
In the discharge unit 10, the polymer jacket 11 of the insulating soot tube 15 is integrated with the polymer jacket 21 of the lightning protection element unit 4. Further, the lightning protection element side discharge electrode 8 is directly inserted into the upper sealed end of the insulating soot tube 14 and integrated with the protruding electrode 16.

With the above configuration, the lightning protection element portion 4 and the insulating soot tube 15 are set in a predetermined mold, and a liquid polymer is injected into this mold and thermally cured, thereby enabling simultaneous production of a high performance jacket material.
As a result, the mechanical strength and quality reliability of the lightning arrester can be increased, and the manufacturing cost can be reduced. Moreover, since the discharge part 10 and the lightning protection element part 4 are integrated, further downsizing can be achieved, and the installation work on site can be simplified. Furthermore, while increasing the leakage distance of the lightning arrester as a whole, it is possible to reliably interrupt the continuity during discharge of the discharge part 10 by suppressing the surface leakage current even in the super heavy fouling area.

(Embodiment 5)
6 and 7 are cross-sectional views of the discharge part in the fifth embodiment of the present invention.
The discharge portion 10 of the second embodiment, the inner wall surface of the insulating porcelain bushing 15, specifically providing the diamond-like carbon (DLC) layer 24 ₁ on the inner wall surface of the pressure-resistant insulating tube 12 (FIG. 6). Further, the discharge portion 10 of the third embodiment, the inner wall surface of the insulating porcelain bushing 15, and the protruding electrode 16, providing a diamond-like carbon (DLC) layer 24 ₂ on the surface except for the tip portion of the hollow protruding electrode 22 ( FIG. 7). DLC, which is appropriately manufactured by selecting process conditions, has common characteristics such as high hardness, high chemical resistance, corrosion resistance, low gas permeability, and high electrical insulation (for example, patents) Reference 3).

With the above configuration, when the discharge of the discharge part 10 is generated, the pressure resistance strength of the insulating soot tube 15 can be enhanced, and there is also a barrier action of the electrode to the metal vapor. Furthermore, with respect to the second embodiment, by forming the dense DLC layer 24 ₁ on the inner wall of the insulating porcelain bushing 15, to eliminate the instability of the surface discharge, it is possible to obtain stable creeping discharge characteristics. Also, centralized with respect to the third embodiment, the protruding electrode 16, by forming the DLC layer 24 ₂ on the surface except for the tip portion of the hollow protruding electrode 22, the electric field maxima and the electronic firing unit to the tip center electrode Therefore, it is possible to obtain a stable air discharge characteristic in the gap inside the insulating soot tube 15.
The present embodiment can also be applied to the discharge unit 10 of the first embodiment.

(Embodiment 6)
In any of the first to fifth embodiments, the polymer jacket 11 and the pressure-resistant insulating cylinder 12 of the insulating soot tube 15 are made of a light transmissive material.

  With the above configuration, when the discharge of the discharge unit 10 occurs, the interelectrode gap inside the insulating soot tube 15 can be observed from the outside. That is, it is possible to monitor the operation performance of the lightning arrester when a lightning surge occurs.

(Embodiment 7)
FIG. 8 is a configuration diagram of a discharge unit in the seventh embodiment of the present invention.
In any one of Embodiments 1 to 6, the light / heat sensor 25 is provided on the power-applying discharge electrode 6.

With the above arrangement, when a discharge occurs in the discharge unit 10 can detect light or hot air is discharged from the ventilation port 20 ₁ to 20 ₃ of the insulating porcelain bushing 15, it is possible to record the number and time of discharge.

DESCRIPTION OF SYMBOLS 1 ... Power transmission line, 2 ... Support insulator, 3 ... Arc horn, 4 ... Lightning protection element part, 5 ... Support arm, 6 ... Power-supply side discharge electrode, 7 ... Mounting bracket, 8 ... Lightning protection element side discharge electrode, 9 ... Series Gap, 10 ... discharge part, 11 ... polymer jacket, 12 ... pressure-resistant insulating cylinder, 13, 14 ... insulating end plate, 15 ... insulating insulator, 16, 17 ... projecting electrode, 18 ... discharge space, 19 ... support rod , 20 ₁ , 20 ₂ , 20 ₃ ... vent hole, 21 ... ring electrode, 22 ... hollow protruding electrode, 23 ... polymer jacket, 24 ₁ , 24 ₂ ... DLC layer, 25 ... light / heat sensor.

Claims (10)

A support insulator and a lightning protection element part that are attached to a support arm of a steel tower and support a transmission line, a discharge part connected to a lower part of the lightning protection element part, and provided between the lightning protection element part and the discharge part Lightning protection element side discharge electrode, the supporting insulator and the charging side discharge electrode attached to the lower end portion of the discharging portion, and the upper end portion of the supporting insulator, facing the end portion of the charging side discharge electrode. A discharge electrode, and the discharge part includes an insulating soot tube in which a discharge space is formed, and a series gap is formed between the lightning protection element side discharge electrode and the charging side discharge electrode inside the insulating soot tube. In the formed lightning arrester for power transmission,
A lightning arrester for power transmission characterized in that an upper end of the insulating soot tube is sealed and a lower end opens the discharge space to the outside.   2. The projecting electrodes of the lightning protection element side discharge electrode and the power application side discharge electrode are respectively inserted into the upper and lower ends of the insulating rod, and the periphery of the projecting electrode at the lower end is an open portion. The lightning arrester for electric power transmission of description.   The projecting electrode of the lightning protection element side discharge electrode is inserted into the upper end of the insulating rod, the ring electrode of the power application side discharge electrode is disposed at the lower end, and the center of the ring electrode is an open part, 2. The lightning arrester for power transmission according to claim 1, wherein the insulating soot tube has an inner diameter that is in close contact with a periphery of a protruding electrode inserted into the upper end.   The projecting electrode of the lightning protection element side discharge electrode is inserted into the upper end of the insulating rod, the hollow projecting electrode of the power application side discharge electrode is inserted into the lower end, and the hollow portion of the hollow projecting electrode is used as the open portion. The lightning arrester for power transmission according to claim 1.   The insulation rod is characterized in that its polymer jacket is integrated with the polymer jacket of the lightning protection element portion, and a protruding electrode inserted at the upper end is integrated with the lightning protection element side discharge electrode. The lightning arrester for power transmission according to any one of claims 2 to 4.   The lightning arrester for power transmission according to claim 3, wherein a diamond-like carbon layer is provided on an inner wall surface of the insulating soot tube.   The lightning arrester for power transmission according to claim 2, wherein a diamond-like carbon layer is provided on a surface excluding the inner wall surface of the insulating rod and the tip of the protruding electrode.   5. The power transmitting device according to claim 4, wherein a diamond-like carbon layer is provided on the inner wall surface of the insulating rod, the surface excluding the tip of the projecting electrode, and the surface excluding the tip of the hollow projecting electrode. Lightning arrester.   The lightning arrester for power transmission according to any one of claims 1 to 8, wherein the insulating soot tube is made of a light transmissive material.   The lightning arrester for power transmission according to any one of claims 1 to 9, wherein a light / heat sensor is provided on the discharge-side discharge electrode.

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