JP2500433Y2 - Insulator device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator device having an optical fiber-embedded insulator in which an optical fiber for signal transmission is housed.

[0002]

2. Description of the Related Art Conventionally, when it is necessary to measure a current or a voltage flowing through a conductor such as a line or a bus in a power transmission line or a substation and monitor it by a ground management facility, for example, Japanese Patent Laid-Open No. 2-265117. As described in the publication, a conductor is held at the lower end of a porcelain support insulator suspended on a grounding member such as a steel tower, and an optical CT or light PT is provided on this conductor to output the output signal of the insulator body. There has been proposed a technique using an optical fiber built-in insulator which is taken out to the ground side by an optical fiber which is housed by covering or enclosing an insulating material in a central through hole. In addition, when the optical fiber is bent with a small radius, signal transmission is hindered. Therefore, in such an insulator with built-in optical fiber, a means for gently bending the optical fiber is provided by providing an optical fiber storage box at the upper and lower ends of the insulator. ing. (Japanese Unexamined Patent Publication No.
(See the description in Japanese Patent Publication No. 211817)

[0003]

However, in the above-mentioned conventional insulator with a built-in optical fiber, since the upper and lower ends of the insulator are connected to the tower and the conductor, respectively, moisture such as rain enters the insulator to cover or enclose the optical fiber. When the insulating material is deteriorated and a conductive path is formed along the optical fiber or the through hole, the insulator causes an internal short circuit between the conductor and the steel tower, which may cause a flashover accident. If an optical fiber storage box is installed at the upper and lower ends of the optical fiber built-in insulator to loosen the bending of the optical fiber, the length of the insulator will be longer than the length of the existing insulator by the amount of the storage box. When this optical fiber built-in insulator is mounted in the space where the conventional existing insulator is mounted, it becomes impossible to maintain a sufficient insulation distance between the charging portion at the lower end of the insulator and the ground such as a steel tower below. The present invention has been made to address the above-mentioned problems, and in particular, the insulator inside the optical fiber built-in insulator is damaged and dielectrically destroyed, and the upper and lower ends of the insulator are electrically conductive along the optical fiber or the through hole. It is an object of the present invention to provide an insulator device including an insulator with a built-in optical fiber in which a short-circuit current does not flow in the insulator and a flashover accident does not occur even if it happens.

[0004]

In order to achieve the above-mentioned object, in the present invention, an insulator device is provided with a support insulator in which a conductor is held at one end and a grounding member is attached at the other end, and An insulator device comprising: an optical fiber built-in insulator having an optical fiber inserted in a through hole for transmitting an output signal of a sensor provided on a conductor to a measuring device provided on the ground side, wherein the optical fiber built-in insulator is grounded on the support insulator. Attached by a connecting metal fitting and a power-supply-side connecting metal fitting, projecting at least one end of the optical fiber built-in insulator from the ground-side connecting metal fitting and the power-supply-side connecting metal fitting, and conducting the short-circuit current through the through hole. It is configured to be a ground side insulation part or a voltage application side insulation part that blocks the above.

[0005]

The operation and effect of the present invention is such that the insulator device of the present invention is damaged by the insulating material inside the insulator with built-in optical fiber and short-circuited along the optical fiber between the upper and lower ends of the insulator. Even when water such as rain enters the through hole in the center and the upper and lower ends of the insulator are electrically connected internally,
Since the insulator with built-in optical fiber is provided with at least one of the ground-side insulation part and the power-supply-side insulation part, the path that short-circuits from the power-supply-side connection fitting to the ground-side connection fitting through the inside of the insulator is this ground-side insulation part. Further, the flashover accident does not occur due to the interruption by the insulating section on the power-supply side, and the signal detection and transmission from the sensor such as the optical CT can be continuously performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. In the insulator device according to the present invention shown in FIG. 1, a supporting insulator 11 holding a conductor 10 is suspended from a steel tower 12, and a grounding side connecting fitting 13 and a charging side connecting fitting 14 attached to the supporting insulator 11. Accordingly, the optical fiber built-in insulator 16 having the optical fiber 15 built in the through hole at the center is supported by the ground-side grip 17 and the charge-side grip 18. And this optical fiber 15 is an insulating material 19
It is housed in this insulator with an insulation coating applied, and serves as a transmission path for transmitting the output signal from the optical CT20, which is a sensor that detects the current of the conductor 10 and converts it into an optical signal, to the ground-side measuring device. Plays the role of. Here, the ground-side grip 17 and the charge-side grip 18 are provided on the main body 16 of the insulator 16 with a built-in optical fiber, which is separated from the optical fiber outlets 21 and 22, and above the ground-side grip 17 of the main body of the insulator 16 with a built-in optical fiber. Further, a grounding side insulating portion 23 and a charging side insulating portion 24 are integrally formed with the insulator body below the charging side grip portion 18. The length including the grounding side insulating portion 23 and the charging side insulating portion 24 may be any length as long as the upper end and the lower end of the insulator 16 with a built-in optical fiber are internally conductive and can prevent a short-circuit current from flowing. That is, the length may be set to withstand a normal ground voltage or a switching surge. The optical fibers 15a and 15b led out from the upper end and the lower end of the optical fiber built-in insulator 16 need to be long enough not to be in a conductive state even if they are coated with rain or the like.

The structure of the sealing portions of the optical fiber outlets 21 and 22 at the upper and lower ends of the insulator 16 with a built-in optical fiber is as shown in FIG. 2 (which shows the structure of the sealing portion at the upper end). The sealing portion of the outlet 21 is composed of a cup-shaped portion 25c forming an optical fiber storage portion, a step portion 25b contacting the end face of the insulator, and a tip end portion 25a contacting the side face of the insulator, and the optical fiber 15c is signaled to the metallic cap 25. Stored by gently bending so that transmission is not hindered,
The cap 25 is fitted to the grounding side insulating part 23 of the insulator, the cap tip part 25a is caulked in conformity with the shape of the grounding side insulating part 23, fixed with the bonding agent 26, and the insulating filler 27 is attached to the cup-shaped part 25c. It has a filled structure. And
An O-ring 28 is used on the insulator end face to prevent moisture such as rain from entering the cup-shaped portion 25c of the cap. Needless to say, the structure of the sealing portion at the upper end of the insulator with a built-in optical fiber shown in FIG. 2 can be applied to the structure of the sealing portion at the lower end. In this embodiment, an adhesive is used for the joint portion of the tip portion 25a, but the adhesive is not always necessary.

If the insulator device is formed in this way, the insulation material 19 inside the insulator 16 with a built-in optical fiber should be damaged, and the upper and lower ends of the insulator 16 can be short-circuited along the optical fiber 15, that is, dielectric breakdown. Even when water such as rain enters the through hole at the center of the insulator and the upper end and the lower end of the insulator 16 are electrically connected to each other internally, the insulator 16 with a built-in optical fiber is provided with the ground-side insulating portion 23 and the power-supply-side insulating portion 24. Therefore, the power supply side connection fitting 13 to the ground side connection fitting 14
The short-circuit path through the insulator is the ground side insulation part 2
3 and the insulation section 24 on the power-supply side do not cause a flashover accident, and signal detection and transmission from a sensor such as optical CT can be continuously performed. Further, in the insulator 16 with a built-in optical fiber of the insulator device configured as described above, the portion kept at a high potential is the power-supply-side connecting metal fitting 14, that is, the power-supply-side gripping portion 18, and the height thereof is that of the support insulator 11. Since this is above the high-potential portion, that is, the conductor 10, when the insulator 16 with a built-in optical fiber is attached to the support insulator 11 which also has a steel tower (not shown) in the lower part, the high-potential connecting fitting 14 and the lower steel tower are connected. The intervals between are kept sufficient, and there is no risk of a flashover accident. And this insulator with built-in optical fiber 1
6 can be attached using the existing insulator as it is as the support insulator 11, and it is preferable that the insulator main body has a thinner thickness than the above-mentioned conventional one in which the conductor is held by the insulator main body with a built-in optical fiber. Therefore, it is possible to expect effects such as effective use of existing equipment and reduction of materials.

In this embodiment, the insulating parts, that is, the grounding side insulating part 23 and the voltage applying side insulating part 24 are provided both above the grounding side connecting fitting 13 and below the power applying side connecting fitting 14. An insulating portion may be provided on either the upper side of the grounding side continuous metal fitting 13 or the lower side of the voltage application side connecting metal fitting 14 so as to prevent conduction of a short circuit current through the through hole of the optical fiber built-in insulator 16. However, considering that the insulator is used in a place exposed to wind and rain, if the insulating portion is attached to only one of the ground side and the power supplying side of the optical fiber built-in insulator 16, the length of the insulating portion becomes long. As a result, the stress applied to the gripping portions 17 and 18 on the side provided with the insulating portion is increased, and the gripping portions are easily damaged. Therefore, as in the above-described embodiment, the insulating portion is provided on both the ground side and the power-supply side. Therefore, it is preferable to reduce the length of one insulating portion of the insulator so as to relieve the stress on the grip portions 17 and 18. Further, the insulator 16 with a built-in optical fiber of this embodiment is formed such that the upper portion is on the ground side and the lower portion is on the voltage applying side, but like the SP insulator, a supporting insulator of a type in which a conductor is held on the upper portion and grounded at the lower portion. 11 is an insulator 16 with a built-in optical fiber, and a grounding side connecting fitting 13 and a charging side connecting fitting 1
4. In this case, the upper part of the insulator 16 with a built-in optical fiber is on the power-supply side and the lower part is on the ground side, and the insulating part 24 on the power-supply side and the ground-side insulating part 23 are respectively the upper end of the insulator with a built-in optical fiber. It is formed at the lower end.

Further, the insulator 16 with a built-in optical fiber is not limited to the one in which the optical fiber is inserted through the through hole of the thin tube provided at the center of the insulator as shown in the embodiment, but the optical fiber is inserted through a spiral hole or a large hole. A type in which an optical fiber is spirally inserted along the wall surface of a through hole having a diameter (for example, JP-A-60-225806 and JP-A-5-225806).
See the description in JP-A-8-158608. ) Is okay. The structure of the sealing portions of the optical fiber outlets 21 and 22 at the upper and lower ends of the insulator 16 with a built-in optical fiber is a sealed structure as shown in FIG. 2 (which shows the structure of the sealing portion at the upper end). Insulation breakdown due to moisture from the optical fiber outlets 21 and 22 can be prevented, and the occurrence of internal short circuits in the optical fiber built-in insulator can be suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an insulator device according to the present invention.

FIG. 2 is a longitudinal sectional view showing an embodiment of a sealing portion of an optical fiber lead-out port of an insulator device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Conductor, 11 ... Supporting insulator, 12 ... Steel tower, 13 ... Grounding side connecting metal fitting, 14 ... Power supply side connecting metal fitting, 15 ... Optical fiber, 16 ... Optical fiber built-in insulator, 17 ... Grounding side gripping part, 18 ... Power supply side Gripping portion, 19 ... Insulating material, 20 ... Sensor, 21 ... Grounding side outlet, 22 ... Charging side outlet, 23 ...
Grounding side insulation part, 24 ... Voltage application side insulation part, 25 ... Cap,
25a ... Tip part, 25b ... Step part, 25c ... Cup-shaped part,
26 ... Bonding agent, 27 ... Insulating filler, 28 ... O-ring.

Claims (2)

(57) [Scope of utility model registration request] 1. A support insulator having a conductor held at one end and attached to a ground member at the other end, and an optical fiber for transmitting an output signal of a sensor provided on the conductor to a measuring device provided on the ground side. An insulator device provided with an optical fiber built-in insulator inserted in a through hole, wherein the optical fiber built-in insulator is attached to the support insulator by a grounding side connecting fitting and a charging side connecting fitting, and at least one end portion of the optical fiber incorporating insulator. An insulator device, wherein the insulator is protruded from the grounding side connecting fitting and the charging side connecting fitting. 2. The optical fiber outlets at the upper end and the lower end of the insulator with built-in optical fiber are accommodated by gently bending the inside of the optical fiber, and a cap encapsulating an insulating filler is fitted to the insulator. The insulator device according to claim 1, wherein the insulator device is fixed by caulking.