JPS62141972A - Ac/dc converter - Google Patents

Abstract

PURPOSE:To contract the installing area of a thyristor bulb and to delete the number of high voltage shields in an AC/DC converter by stereoscopically disposing thyristor bulbs of respective phases elevationally, and arranging high voltage shields at the connections. CONSTITUTION:6-arm thyristor bulbs for forming thyristor bulb group have a 2-arm bulbs and 3 thyristor bulbs 20-22. The bulbs 20, 21 of the three thyristor bulbs 20-22 are hung from the ceiling of a thyristor bulb hall 11, the bulb 22 is installed on a ground to form an AC/DC converter group. The bulbs 20, 21 and 22 are connected substantially at the central position of the hall 11, and an electric field alleviating shield 23 is disposed at the connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an AC/DC converter in which the arrangement of an air-insulated thyristor valve is improved.

[Technical background of the invention and its problems] With the increase in electricity demand in recent years, DC power transmission, which has many advantages in system operation, such as large capacity, long distance power transmission, and power interchange between different frequency systems, has become popular. It is used in the direction. Currently, in Japan, there are two
50KV 100-current power transmission has been implemented, and it is hoped that this DC power transmission will have a larger capacity and a higher voltage in the future.

FIG. 3 shows a typical wiring diagram of an AC/DC converter station in conventional DC power transmission. This AC/DC converter station performs 12-phase rectification, and voltage is supplied from the 3-phase AC voltage system 1 to the thyristor valve groups 4 and 5 via converter transformers 2 and 3, and then converted to DC voltage. It is something. Air-insulated thyristor valves are used as the thyristor valve group 4゜5 due to their operational history and ease of maintenance and inspection work, and are usually housed in a building called a valve hole 6.7. ing. In addition, thyristor valve group 4,
A lightning arrester 8.9 is provided for electrical protection of 5.

FIG. 4 shows peripheral equipment for such a conventional AC/DC converter. Note that FIG. 4 shows the low-pressure side thyristor valve u5 and its peripheral equipment in FIG. 3. That is,
From the three-phase AC voltage system 1, through the converter transformer 3,
The air insulated thyristor valve 12 is connected to an air insulated thyristor valve 12 which has two arm parts in one, and a lightning arrester 15 is connected to the air insulated thyristor valve 12. It is housed in the hall 11. Roughly speaking, the thyristor valve hole 11 is provided with a blocking coil 13 against invading surge voltage and a through-wall bushing 14 that guides the DC output to the outside of the thyristor valve hole 11 .

In the conventional AC/DC converter station configured in this way, the thyristor valve 12 installed in the thyristor valve hole 11 becomes larger as the capacity and voltage of the AC/DC converter increases. That is, as shown in Fig. 5, the thyristor valve 12 is constructed by combining two amperes into one unit, and is a single unit in which several thyristor elements each handling several thousand volts are connected in series. Thyristor assembly (hereinafter referred to as module) 1
6 are supported by insulating columns 18 and arranged in multiple stages at predetermined intervals. In the thyristor valve 12 configured in this way, as the voltage increases and the capacity increases, the module itself also has a thyristor element,
As internal elements such as capacitors and resistors become larger, the thyristor valve 12 becomes larger.
will also become larger.

Further, since the thyristor valve 12 is configured by stacking modules in multiple stages, a potential difference occurs between the upper and lower modules. This potential difference necessarily tends to increase in proportion to the increase in voltage, so the insulation distance between the top and bottom of the module must also be increased, and accordingly, the insulation distance between the top and bottom of the module must be increased.
2 is also enlarged, and roughly speaking, the lightning arrester 15 is also enlarged.

As a result, the thyristor valve hole 11 that accommodates the thyristor valve 12 and the lightning arrester 15 must also be enlarged. In particular, since the floor area becomes large, the site area must be increased when constructing an AC/DC converter station, which poses a serious problem when an AC/DC converter station is constructed in a place with a small site area.

Furthermore, in the thyristor valve 12 arranged as shown in FIG. In other words, an electric field mitigation shield 17 must be installed on the high voltage side. The higher the voltage of the electric field mitigation shield 17 at the mouth, the greater the curvature of the corners of the shield 17, which increases the manufacturing and processing costs.

[Object of the Invention] The present invention was proposed in order to solve the problems of the conventional AC/DC converter as described above, and the purpose is to improve the arrangement of the thyristor valve. An object of the present invention is to provide an AC/DC converter that can reduce the number of high-voltage shields installed, and can also reduce the size of the thyristor valve hole and the installation area.

[Summary of the Invention] The AC/DC converter of the present invention includes air-insulated thyristor valves installed on the ground and on the ceiling of the thyristor valve hole, vertically arranged three-dimensionally, and a high-voltage shield arranged at the joints. This greatly reduces the installation area of the thyristor valve, and also reduces the number of high-pressure shields, making it possible to significantly reduce cost.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be specifically described with reference to FIGS. 1 and 2. Note that the same members as those of the conventional type shown in FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof will be omitted.

■First Example *Configuration* In this example, as shown in Fig. 1, the 6-arm →Neuristar valve that forms the thyristor valve group has two
Three 1-no-irristor valves 2, one for each arm.
It is composed of 0,21.22. Of these three thyristor valves 20, 21.22, two thyristor valves 20.21 for 4 units are hung from the ceiling of the 4-unit valve hole 11, and the other thyristor valves 20, 21. The cyrisk valves 22 for one arm are installed on the ground to form an AC/DC converter group. Two thyristor valves 20 and 21 hung from the ceiling of the thyristor valve hole 11 and one thyristor valve 22 installed on the ground are located at approximately the middle position of the thyristor valve hole 11. It is joined. Furthermore, one electric field mitigation shield 23 is provided at this junction.

*Function* In this embodiment having such a configuration, the shield 2 disposed on the high pressure side of the thyristor valves 20, 21, 22
Since 3 can be made 11 hard, the manufacturing cost of the high voltage shield can be significantly reduced. Furthermore, since the shape of the high voltage shield 23 becomes larger, the electric field relaxation effect is also significantly improved.

In general, by arranging the thyristor valves three-dimensionally, the installation area can be reduced, and the site area of the AC/DC converter station can be reduced.

■Second embodiment *Configuration* In this embodiment, as shown in Fig. 2, the 6-arm thyristor valves forming the thyristor valve group are divided into 3 thyristor valves, with 2 arms as 1 unit. Valve 30,3
1.32. Of these three thyristor valves 30, 31.32, two thyristor valves 30.31 for 4 units are located in the thyristor valve hole 11.
The other 4 thyristor valves 32 are installed on the ground, and the lightning arrester 15 for electrically protecting these thyristor valves is installed on the ground. A group of AC/DC converters is formed by installing the AC/DC converters. Then, one of the two thyristor valves 30, 3°1 installed suspended on the ceiling of the thyristor valve hole 11
stand 30 and one Nyristor valve 3 installed on the ground
2 are joined at approximately the middle position of the thyristor valve hole 11. Further, the thyristor valve 31 suspended from the ceiling of the thyristor valve hole 11 and the lightning arrester 15 installed on the ground are similarly connected at approximately the middle position of the thyristor valve hole 11. Further, electric field mitigation shields 33 and 34 are provided at these junctions.

Note that the rectification directions of the thyristor valves 30 and 31 installed on the ceiling of the thyristor valve hole and the nyristor valve 32 installed on the ground are opposite to each other.

*Function* In this embodiment configured in this manner, the outputs converted into AC/DC by the thyristor valves 30.3'l and 32 are connected to the through-wall bushing 14 through the connecting wires 35 and 36, and the thyristor valves are connected through this to the through-wall bushing 14. It is led out to the outside of the hole 11.

When thyristor valves are arranged as described above, the installation area is reduced by approximately 1% compared to the installation area of conventional thyristor valves.
/2. As a result, the floor area of the thyristor valve hole 11 that accommodates the thyristor valve can be reduced, making it possible to significantly reduce the site area for burying the AC/DC converter station.

■Other embodiments The present invention is not limited to the above-mentioned embodiments, but two of the three thyristor valves are installed on the ground,
One unit may be installed hanging from the ceiling of the thyristor valve hole, and a high pressure shield may be attached to the joint.

Further, although the present invention has been described with reference to a two-phase rectification type AC/DC converter, the number of phases may be any number.

Generally speaking, this embodiment has been described for the low-pressure thyristor valve group, but the same applies to the high-pressure thyristor valve group.

[Effects of the Invention] As described above, according to the present invention, by improving the arrangement of the thyristor valve, the number of high pressure shields disposed on the thyristor valve can be reduced, and the installation area of the thyristor valve can be reduced. Accordingly, it is possible to provide an AC/DC converter that allows the thyristor valve hole to be smaller and the installation area to be smaller.

[Brief explanation of drawings]

1 and 2 are side views showing one embodiment of the AC/DC converter of the present invention, FIG. 3 is a connection diagram of a conventional AC/DC converter station, and FIG.
The figure is a perspective view showing the arrangement of peripheral equipment of a conventional AC/DC converter.
FIG. 5 is a side view of a conventional AC/DC converter. 1... 3-phase AC voltage system, 2, 3... Converter transformer, 4, 5... Thyrisk valve, 6, 7... Thyristor valve hole, 8, 9... Lightning arrester, 11 ...
Thyristor valve hole, 12... Thyristor valve, 13... Blocking coil, 14... Through-wall bushing, 15... Lightning arrester, 16... Module, 1
7... High voltage shield, 18... Insulating support column, 20.2
1.22...Thyristor valve, 23...High pressure shield, 30°31.32...Thyristor valve, 33
．． 34...High voltage shield, 35.36...Connection wire.

Claims (1)

[Claims] 1) A three-phase air insulation system in which a unit of thyristor element assembly, in which several thyristor elements are connected in series, is supported by insulating struts and arranged in multiple stages at regular intervals. An AC/DC converter equipped with thyristor valves, characterized in that the thyristor valves of each phase are vertically arranged in a three-dimensional manner, and a high-pressure shield is provided at a joint between the thyristor valves. 2) The AC/DC converter according to claim 1, wherein each of the thyristor valves is installed on the ground or on the ceiling of a thyristor valve hole. 3) The AC/DC converter according to claims 1 and 2, wherein the rectifying directions of the thyristor valve installed on the ground and the thyristor valve installed on the ceiling of the thyristor valve hole are opposite to each other. 4) The thyristor valve is installed with two-phase distribution on either the ceiling or the ground of the thyristor valve hole, and one-phase distribution on the other side, and a plurality of high-pressure shields are installed at the joint portion of the two. The AC/DC converter according to Claims 1 and 2, which shields a thyristor valve. 5) The AC/DC converter according to Claims 1 and 2, wherein the high voltage shield is disposed at a joint between a thyristor valve and a lightning arrester disposed on the ceiling of a thyristor valve hole or on the ground. vessel.