JPH03189568A - Optical instrument transformer of gass insulated switch device - Google Patents

Abstract

PURPOSE:To protect the optical fiber for optical information transmission of the optical instrument transformer insulatedly and mechanically by running the optical fiber through a lead-out hole formed in an insulating spacer and then charging a gelled high insulating material in the lead-out hole. CONSTITUTION:The optical instrument transformer 10 is provided at the support part of the insulating spacer 3 of a high voltage conductor 2. The periphery of a sensor 10 is protected by an electric field shield 5. The spacer 3 is provided with the lead-out hole 15 which is open at one end nearby the fitting part of the sensor 10 and also open at the other end in the outside surface of the spacer 3 appearing outside a sealed container 1, the internal optical fiber 11a for optical information transmission is run through the hole 15, and the gelled insulating filler 12 is charged in the hole 15. The internal end of the fiber 11a is connected to the prism 14 of the sensor 10 through a connector 13a and the external and is connected to the external optical fiber 11b of the switch device through a connector 13b. Consequently, the creeping electric field of the spacer 3 is not disordered greatly and an arc generated in case of an internal accident in the container 1 is also protected outside the spacer 3 to prevent the fiber 11a from being damaged.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a live part of an instrument optical transformer having a sensor part on a live part conductor of a gas insulated switchgear (hereinafter referred to as GIS). This invention relates to an instrument optical transformer for a gas-insulated switchgear configured to extract optical information from the GIS to the outside using an optical fiber.

(Prior Art) FIG. 4 shows an example of a conventional configuration in which optical information is extracted from a charging part sensor of an instrument optical transformer to the outside of a GIS using an optical fiber. In FIG. 4, an instrument optical transformer sensor 10 is placed near a spacer 3 of a live part conductor 2, and transmits optical information through an optical fiber 11 in an insulating gas atmosphere.

Here, there were the following problems in terms of insulation performance and mechanical strength of the optical fiber 11.

■ Optical fibers are insulators, but because their dielectric constant is different from that of the filler gas (relative dielectric constant of optical fibers is about 4, while gas is about 1), electric field concentration occurs on the optical fibers, and the insulation strength along the optical fibers is poor. Become.

■ If a ground fault or short circuit occurs near the sensor 10, the generated arc 20 moves through the gas and comes into contact with the optical fiber 11, causing thermal, electrical, and chemical damage to the optical fiber 11, resulting in transmission failure. There is a risk of becoming incapacitated.

Therefore, as a conventional installation configuration, from the live part sensor to the GI
An optical fiber 11 for extracting optical information to the outside is fixed spirally on an insulating spacer 3 to ensure creeping insulation distance of the optical fiber. However, although this configuration solves the above-mentioned problem (1), the electric field along the surface of the insulating spacer is disturbed due to the difference in dielectric constant between the insulating spacer and the optical fiber, which is not preferable from the standpoint of insulation design of the creeping electric field of the insulating spacer.

A problem arises. Furthermore, the above-mentioned problem (2) has not yet been resolved.

Furthermore, as a configuration to solve the problem (2) above, a hole is provided in the insulating spacer 3 of the GIS to draw out the optical fiber 11,
By laying the optical fiber in this hole of the insulating spacer 3, the optical fiber 11 is protected from arcs 20 in the gas. When installing the optical fiber 11, a certain amount of creepage distance can be secured by bending the optical fiber 11 in the hole, but in terms of insulation strength and retention of the optical fiber, if vibration is applied from the outside, Since the bent fibers in the holes are not sufficiently retained, reliability in terms of mechanical strength is low, which has been a problem.

Furthermore, in order to solve the problem caused by the bending of the optical fiber 11, the optical fiber 11 is placed inside the insulating spacer 3 when it is molded.
There is also a method of molding 1. In this method,
Although the problems of (1) to (3) are almost solved, residual stress remains in the optical fiber 11 during molding, which causes errors in optical information when transmitting polarized light or other light into the optical fiber, making it difficult to adopt. Furthermore, there were problems such as difficulty in ensuring strength when molding the insulating spacer.

(Problem to be Solved by the Invention) In this way, when extracting information from the optical transformer sensor installed in the internal charging part of the GIS in the instrument optical transformer to the outside of the GIS using an optical fiber, it is necessary to ensure sufficient insulation strength of the GIS. However, there is a need for a configuration that protects optical fibers from arcs in gas that occur during ground faults or short-circuit accidents, and that does not place a burden on the fibers or insulating spacers themselves.

The object of the present invention is to provide an optical transformation system for instruments of gas-insulated switchgear that insulatively and mechanically protects fibers for optical information transmission, that is also protected from arcs generated during internal accidents, and that does not disturb the electric field of insulating spacers. It is about providing the equipment.

[Structure of the invention]

(Means for Solving the Problems) The instrument optical transformer of the gas-insulated switchgear of the present invention houses a live part insulated and supported by an insulating spacer in a container filled with an insulating medium, and the conductor of the live part is In an instrument optical transformer for a gas-insulated switchgear whose current and voltage are measured by a magneto-optical sensor and an optical electric field sensor, an optical fiber for transmitting optical information of the instrument optical transformer is passed through a lead-out hole provided in the insulating spacer. In addition, the outlet hole is filled with a gel-like highly insulating material.

(Function) In the present invention, since the optical fiber is installed inside the insulating spacer, the electric field distribution on the outer surface of the insulating spacer is not disturbed, and it is protected from the arc generated in the event of an internal accident. The filling provides sufficient mechanical protection.

(Embodiments) The present invention will be described below with reference to embodiments shown in FIGS. 1, 2, and 3. In FIG. 1 showing a sealed body part of a gas insulated switchgear according to the present invention, a high voltage conductor 2 serving as a live part is insulated and supported by an insulating spacer 3 in a sealed container 1 in which an insulating gas 4 is sealed.

The present invention is applied to the case where the instrument optical transformer sensor 10 is provided on the support portion of the insulating spacer 3 of the high voltage conductor 2 to measure the current and voltage of the high voltage conductor 2. The area around this optical transformer sensor 10 is electrically protected by an electric field shield 5.

The present invention is characterized by the method of laying the optical fiber 11 for optical information transmission of the optical transformer sensor 10.

That is, one end of the insulating spacer 3 is connected to the optical transformer sensor 10.
A lead-out hole 15 is provided which opens near the mounting portion of the insulating spacer 3 and which opens at the outer surface of the insulating spacer 3 that appears outside the airtight container 1.
a, and by filling the outlet hole 15 with a gel-like insulating filling material 12, the internal optical fiber 1
The feature is that the dielectric strength and airtightness of the installation part 1a are ensured.

At the inner end of this internal optical fiber 11a for transmitting optical information,
There is an optical fiber connector 13a and an optical transformer sensor 1
The optical fiber 11 is connected to the prism 14 of
At the outer end of a, there is also an optical fiber connector 13b, which is connected to an external optical fiber 11b of the gas-insulated switchgear. Therefore, optical information transmission of the optical transformer sensor 10 takes place through this inner optical fiber 11a and outer optical fiber 11b.

Therefore, 1 internal optical fiber for optical information transmission of the present invention 1
According to the installation configuration 1a, the inside of the lead-out hole 15 through which the internal optical fiber 11a passes is filled with a gel-like high-insulating material 12 to insulate the inside of the lead-out hole 15 and to enable fixing and sealing of the optical fiber 11a.

Furthermore, since the optical fiber 11a passes through the inside of the insulating spacer 3, the creeping electric field of the spacer 3 is not greatly disturbed, and the arc generated in the event of an internal accident inside the sealed container 1 is protected outside the spacer 3, and the optical fiber 11a is Cannot be damaged.

Next, in other embodiments shown in FIGS. 2 and 3, in order to reduce the electric field strength applied to the internal optical fiber (lla) for optical information transmission and the filled gel-like high insulating material 12, the lead-out hole of the insulating spacer 3 is 15 is provided in a spiral shape, and an internal optical fiber 11a is passed through the spiral outlet hole 15 to fill it with a gel-like high insulating material 12.

Due to the spiral arrangement of the optical fiber 11a, the electric field applied per unit length of the optical fiber 11a and the gel-like high insulating material 12 is sufficiently relaxed.

Note that the other advantages regarding the internal electric field within the sealed container 1 and the advantages regarding the presence or absence of damage to the optical fiber 11a are the same as those of the embodiment shown in FIG.

〔Effect of the invention〕

As described above, in the present invention, an optical fiber is passed from an optical transformer sensor provided in a live part of an instrument optical transformer through a lead-out hole provided inside an insulating spacer, and a gel-like high insulating material is further applied inside the lead-out hole. By filling it, you can expect the following effects.

■ Since most of the optical fiber is not exposed to the gas, no electric field concentration occurs on the optical fiber.

■ Even if a ground fault or short circuit occurs near the sensor, part of the optical fiber is inside the insulating spacer, so it will not be damaged by the generated arc.

■ Since the optical fiber is inside the insulating spacer, it does not significantly disturb the spacer's surface electric field.

(a) Since the optical fiber is flexibly held in the extraction hole by a gel-like substance, the problem of residual stress from the insulating spacer, which is a problem in optical fiber transmission, does not occur.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an optical transformer for instrumentation of a gas-insulated switchgear according to the present invention, FIG. 2 is a cross-sectional view showing another embodiment of the present invention, and FIG. A side view showing the insulating spacer used and the state in which optical fibers are installed, and FIG. 4 is a sectional view showing a conventional gas insulated switchgear. 1... Sealed tank 2... High voltage conductor 3...
- Insulating spacer 4... Insulating gas 5... Electric field shield 10... Optical transformer sensor 11a...
- Internal optical fiber 11b... External optical fiber 12... Gel-like high insulating material 13... Optical fiber connector 14... Prism 1
5... Derivation hole (8733) Agent patent attorney Yoshiaki Inomata (and 1 other person) No. 1! Figure Figure Figure Figure

Claims (1)

[Claims] Optical conversion for instruments in gas-insulated switchgear in which a live part is insulated and supported by an insulating spacer and housed in a container filled with an insulating medium, and the current and voltage of the conductor of the live part are measured by a magneto-optical sensor and a photoelectric field sensor. In the gas insulation device, the optical fiber for optical information transmission of the instrument optical transformer is passed through a lead-out hole provided in the insulating spacer, and the lead-out hole is filled with a gel-like high insulating material. Optical transformer for instrumentation of switchgear.