JPS6036566B2 - How to fix the light guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of fixing a plurality of light guides for high-voltage electrical equipment for transmitting optical signals between a high-voltage part and a low-voltage part, such as a ground potential. .

Converts an electrical signal from a high voltage part into an optical signal and transmits this signal to the ground side, or transmits a signal from the ground side as an optical signal to a high voltage part and converts it into an electrical signal at the high voltage part, etc. In order to measure, detect, or control the amount of electricity in electrical equipment in high-voltage areas, tens to thousands of insulating optical fibers that have the property of transmitting light even in curved paths are supplied. A light guide is used, which is constructed by covering the light with a solid insulator.

When placing multiple long light guides between a high-voltage area and a low-voltage area, wire them together and fix the bundled area at a location with an appropriate potential on the wiring route. This allows the space for light guide wiring to be significantly reduced. In this case, a plurality of light guides IA, IB are fastened and fixed with metal binds 2 at fixed points at appropriate potentials along the route, as shown in the sectional view of FIG. When wiring multiple light guides between a high voltage part and a low voltage part in this way, at a fixed point with an appropriate potential, the potential will be applied only to the outer peripheral part of the light guide IA that is in contact with the metal/wind. A voltage difference is generated between the outer light guide and the inner light guide IB which does not come into contact with the metal pin, which has the drawback of causing partial discharge even at a low voltage.

The purpose of the present invention is to bundle a plurality of long light guides,
When wiring between a high-voltage part and a low-voltage part, a fixing method for light guides with good insulation properties is provided by ensuring that the potential at the fixing point is applied to the light guides inside the bundle at the intermediate fixing point. There is something to do.

The present invention is capable of producing partial discharge along the surface of the light guide at an extremely low voltage value when a high voltage of DC or AC is applied between the fixed points where a plurality of light guides are bundled and fixed. It has been confirmed through experiments that the electric potential can be increased significantly by applying an electric potential to the light guide inside the fixed point, and as a means to prevent partial discharge from occurring, metal tape or metal can also be placed inside the fixed point. A metal ring or a metal frame is arranged.

As a preferred embodiment of the present invention, an embodiment of a thyristor valve for AC/DC conversion in DC power transmission or frequency conversion will be shown below.

The thyristor valve for AC/DC conversion shown in the block diagram of FIG. 2 is constructed by stacking multiple thyristor stacks 4A and 4B connected in series, each consisting of a plurality of thyristor elements 3 connected in series and parallel. The stages are connected in series.

5A and 5B indicate a current input terminal and an output device.

The electrical signal for controlling the thyristor element 3 is converted into an optical signal by a photoelectric conversion device 6 installed on the ground side.
This optical signal is transmitted via the light guide 7 to the photoelectric conversion device 8 installed on the side of the thyristor element 3 which is at a high potential, where it is converted into an electric signal and controls the gate of each thyristor element 3. Performs conduction control. Although not shown, the thyristor control device described above is provided in all the thyristor elements 3. In addition, the photoelectric conversion device 6,
8 and the light guide 7 etc. are provided in each thyristor stack 4A, 4B instead of providing each light guide element 3.
Set in units. Alternatively, the signals may be distributed by the photoelectric conversion device 8.

The side view of the thyristor valve with the circuit configuration shown in Figure 2 is shown in Figure 3.
As shown in the figure. In the figure, the stages connected in series are housed inside shields 9A and 9B, and are stacked from the bottom to the top. In addition, 101 is the base, 11 is the insulating plate, 1
2 is a shield. A photoelectric conversion device 6, a light guide 7, and a photoelectric conversion device 8 are installed between each of these stages and the ground. In this case, in order to reduce the space for these wirings vertically, the light guides 7 are bundled together as shown in the figure and fixed with metal wires 13, and the potentials of each stage are applied to them. FIG. 4 shows an embodiment of the present invention, and shows a section taken along line 1-1' in FIG.

In the figure, a conductive tape or semiconductive tape 14 is wound around the outer circumference of the light guide 7, such light guides are bundled, and a conductive tape 15 is wrapped around the east outer circumference.
is wound and further fixed with a metal binder 16. FIG. 5 shows the row 0' cross section of FIG. 4, and conductive tapes 14A and 14B are wound around the outer peripheries of the light guides 7A and 7B, respectively, and are in contact with each other. A conductive tape 15 is wound around the east outer periphery of the light guide, which is further surrounded by a metal bind 16. With such a structure, the electric potential of the metal/wind 16 can be reliably applied to the light guide inside the east side. FIG. 6 shows a side view of an embodiment in which a conductive tape 14 such as aluminum tape is wound around the part corresponding to the fixing point of the light guide 7, and is shown in FIG. .

In the figure, reference numeral 7 indicates a light guide 14 that is a conductive tape. According to an embodiment of the present invention, when a plurality of light guides are bundled with a metal/wind, the potential of the outer periphery of the light guide located inside the east is kept equal to the potential of the metal/wind. This has the effect of stably increasing the partial discharge inception potential.

Although the embodiments have been described above using a thyristor valve for AC/DC conversion, the present invention can also be applied to general electrical equipment that uses a plurality of light guides.

FIG. 8 shows a cross section of another embodiment of the present invention. The difference from FIG. 6 is that a semiconductive tape or a conductive tape 17 is wound around the outer periphery of the light guide 7, and the end portion is wrapped around the outer periphery of the light guide 7. The point is that a rounded conductive ring 18 is provided. W- in Figure 8
The N' cross section is shown in FIG. In the embodiments shown in FIGS. 8 and 9, the partial discharge inception voltage is further reduced because sharp corners of the conductive electrodes are eliminated and the light guides are arranged with appropriate spacing from each other in the east interior of the fixed point. Also, the light guide bundle can be made of metal/wind 16.
When tightened, the stress is applied to the metal ring 18,
There are effects that light guides do not have. FIG. 10 shows another embodiment of the present invention, which differs from FIGS. 4 and 9 in that a metal hexagonal ring 19 is used.

Note that the same reference numerals in this figure as those in FIG. 4 are given the same symbols. FIG. 11 shows a longitudinal cross section at a fixing point of the light guide 7, and FIG. 12 shows a cross section taken along line V-V' in the same figure. As shown in FIG. 12, a metal hexagonal ring 19 having a regular hexagonal shape is attached. In this embodiment, since the metal rings are in surface contact with each other, the contact between the rings is improved. Fig. 13 shows another embodiment of the present invention, and the difference from Fig. 4 is that The point is that metal frames 20B and 20A having comb-shaped grooves are used instead of conductive rings.

FIG. 14 shows a cross section taken along line NW' in FIG. 13. Figure 13,
In FIG. 14, a semiconductive tape 17 is wound around the outer periphery of the light guide 7, inserted into the groove of the metal frame 20A, and held in place by the metal frame 20B. In this embodiment, there is no need to worry about poor contact between the rings due to corrosion of the conductive rings, and there is an advantage that potential can be reliably applied to each light guide.

As explained above, according to the present invention, when wiring a plurality of longest light guides between a high voltage part and a low voltage part, they are bundled together at the middle part and fixed at the fixed point of the bracket. The light guide located inside the east side of the light guide can also reliably apply a fixed point potential, which has the effect of significantly reducing the space for light guide wiring while maintaining good insulation properties.

[Brief explanation of the drawing]

FIG. 1 is a sectional view for explaining a conventional embodiment, FIG. 2 is a block diagram for explaining an embodiment of the present invention applied to a thyristor valve, and FIG. 3 is a block diagram for explaining an embodiment of the present invention. FIG. 4 is a sectional view of an embodiment of the present invention, FIG. 5 is a sectional view of the row 0' of FIG. 7 is a sectional view taken along line NW' in FIG. 6, FIG. 8 is a sectional view taken along line W-W' in FIG. 8, and FIG. 9 is a sectional view taken along line W-W' in FIG. 1st
FIG. 0 is a sectional view of another embodiment of the present invention, and FIG. 11 is a sectional view of another embodiment of the present invention.
12 is a cross-sectional view of the components shown in the figure, and FIG.
13 is a sectional view of another embodiment of the present invention, and FIG. 14 is a sectional view taken at - in FIG. 13. IA, IB, 7, 7A, 7B...Light guide, 2, 16
...metallic bind, 14, 14A, 14B, 15,
17... Conductive tape or semiconductive tape, 18
...Conductive ring, 19 - Metallic hexagonal ring, 6,8...
- Photoelectric conversion device, 20A, 20B, . ．． metal frame. Figure 7, dance, 1, friend 2, hair, 3, q, home, 11, 4, 5, 5, 6, 8, hakama, lo, friend' 2, figure 13, incident diagram

Claims (1)

[Claims] 1. A plurality of long light guides made by bundling a plurality of optical fibers and covering them with a solid insulator are bundled together as a means of optical signal transmission between a high voltage region and a low voltage region. In an electrical device wired as a wire, conductive or semi-conductive tape is wrapped around each individual light guide at a fixed point at an appropriate potential within the device in the middle of a bundle of wired light guides. A light guide fixing method characterized by bundling light guides by bringing conductive tapes or semiconductive tapes into contact with each other, and tightening and fixing the outer periphery of this bundle with a metal binder. 2. In an electrical device in which a plurality of long light guides made by bundling a plurality of optical fibers and covering them with a solid insulator are bundled and wired as a means of optical signal transmission between a high voltage part and a low voltage part. , a conductive or semiconductive tape is wound around each individual light guide at a fixed point with an appropriate potential in the device in the middle of a bundle of wired light guides, and a metal ring is placed on top of this. A method for fixing a light guide, which comprises: bundling light guides by bringing the metallic rings into contact with each other, and tightening and fixing the outer periphery of the bundle with a metallic binder. 3. In an electrical device in which a plurality of long light guides made by bundling a plurality of optical fibers and covering them with a solid insulator are bundled and wired as a means of optical signal transmission between a high voltage part and a low voltage part. Wrap conductive or semi-conductive tape around each individual light guide at a fixed point at an appropriate potential in the device in the middle of the bundle of wired light guides. A plurality of light guides are fixed inside the device and have grooves cut into a comb shape, and the light guides are fitted and fixed in the grooves of the metal frame so that the conductive tapes are in contact with each other. How to fix the light guide.