JPH08162609A - Thyristor valve - Google Patents

Abstract

PURPOSE: To obtain a thyristor module wherein disassembly and assembly at the time of transportation and installation is easy, and the height also can be reduced. CONSTITUTION: Thyristor modules 5 are loaded on insulating struts 1A disposed in upright on the upper surface of a trestle, and the number of the modules is in the range allowable for carriage. Insulating struts 1B for fixing a ceiling frame 4 to the upper ends of the insulating struts 1A are disposed in upright on the insulating struts 1A. When transporting, the insulating struts 1B are removed together with the ceiling frame 4, and a suspension frame of exclusive use for installation is fixed via metal struts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-insulated thyristor valve in which a plurality of unit thyristor valves are stacked.

[0002]

2. Description of the Related Art As is well known, high voltage, large capacity thyristor valves are used in AC / DC converters and frequency converters installed for large capacity long-distance power transmission.
Among them, DC power transmission tends to be further increased in capacity and voltage in order to improve power transmission efficiency.

FIG. 5 is a perspective view showing an example of a conventional thyristor valve, and shows a case where units incorporating four thyristor modules are stacked in two stages. In FIG. 5, a pedestal 2 installed by a terrain bolt (not shown) on the floor surface of a building (not shown) has a glass fiber reinforced epoxy resin for each corner and middle portion of a rectangle in a plan view (not shown). An insulating support column 1E made of a plastic material in a tubular shape is erected via an annular flange portion joined to the lower end of the insulating support column 1E. A floor plate 15 having the same shape as the pedestal 2 and having a small thickness in a plan view (not shown) is provided at the upper end of each of the insulating columns 1E via a flange portion joined to the upper ends of the insulating columns 1E.

The floor board 15 is similarly placed and fixed on the upper surface of the floor board 15, and the insulating pillar 1F made of the same material and having the same diameter as the insulating pillar 1E is also provided at each corner and intermediate portion of the floor board 15 on the plan view.
Are also set up respectively.

Of these, rectangular steps 7A are fixed in two steps vertically in the middle of the upper, lower, left and right struts 1E, 1F, and in the middle of the insulating pillars 1E, 1F in the center, compared to step 7A. The step 7B having a long right and left direction is symmetrically fixed. Between these steps 7A and 7B, the thyristor module 5 is mounted and fixed via a supporting plate projecting to the left and right of each thyristor module 5 with a predetermined gap therebetween.

To these thyristor modules 5, a thyristor stack (not shown), a CR unit composed of a capacitor and a resistor connected in parallel to the thyristor stack 4, and a reactor (not shown) are also attached.

A ceiling frame 4 made of chevron steel is fixed to the upper end of the insulating support column 1F by a bolt via a flange portion joined to the upper end of the insulating support column 1F. Further, the thyristor modules 5 stacked one above the other are connected by insulating pipes 8 that supply cooling water for cooling the thyristor stacks incorporated in the thyristor modules 5.

In the thyristor valve thus constructed, when the rated voltage is DC 250 kV, the thyristor valve may be stacked four times as double as the thyristor stack shown in FIG. 5, and in this case, the uppermost unit thyristor is stacked. The height from the floor surface to the upper end of the valve 20 may be about 12 meters even if it is already in operation.

On the other hand, in order to suppress the required floor area of the valve hole in which the thyristor valve is installed, it is further required to increase the number of layers of the thyristor valve. Therefore, a thyristor valve having an ever-increasing capacity has to be composed of an insulating column having sufficient strength.

Further, due to the restriction of the height of the valve hole building, there is a demand for a thyristor valve which is low in height and capable of increasing the number of stacked thyristor modules.

In the air-insulated thyristor valve, due to the necessity of the insulation strength corresponding to high voltage and the above-mentioned mechanical strength, a cylindrical tube made of glass fiber reinforced plastic having a bending stress of about 10 times or more as compared with the insulator. Conventionally, the FRP pipe molded in the above is used.

[0012]

However, the conventional thyristor valve thus constructed has the following problems. That is, since the insulating columns 1E and 1F are vertically divided during transportation between the thyristor module 5 and the thyristor module 5, it is necessary to remove a large number of insulating tubes 8 connecting the thyristor modules 5 to each other. Therefore, dismantling at the time of shipment from the factory and restoration work at the installation site take time, and inspection after restoration also takes time.

Further, since the insulating columns 1E and 1F are divided at the central portion, not only is the strength of the thyristor stack lower than that of an integrally formed insulating column from the upper end to the lower end, but also the strength of the joint is reduced. Reliability can also be an issue. Therefore, an object of the present invention is to provide a highly reliable thyristor valve, which requires less disassembly during transportation, can be easily restored at the installation site.

[0014]

A thyristor valve according to a first aspect of the present invention is a first insulating tube for suspending a thyristor module between a plurality of flange portions formed on the outer periphery of a cylindrical portion. And a ceiling frame is fixed to the upper end of the first insulating pipe with respect to the upper end of the second insulating pipe.
It is characterized in that a short insulating tube of upright was erected. The thyristor valve of the invention described in claim 2 is characterized in that the second short insulating pipe is a pleated insulator.

[0015]

A plurality of thyristor modules that are vertically suspended are suspended from one first insulating pipe having no connecting portion via a flange portion, and the height during transportation and installation is reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the thyristor valve of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the thyristor valve of the present invention, and is a view corresponding to FIG. 5 shown in the prior art. 5 is different from FIG. 5 in that the insulating columns are long insulating columns 1A at the bottom and short insulating columns 1B at the upper end.
The other parts are the same as those shown in FIG. Therefore, the same elements as those in FIG.

In FIG. 1, the six insulating columns 1A standing on the upper surface of the floor plate 2 installed in the valve hole are shown in FIG.
Compared with the insulating support column 1E shown in, the length is substantially longer by the distance between the pair of vertically adjacent steps 7A.

In these insulating columns 7A, steps 7A and 7B, which are the same products as the steps 7A and 7B joined to the insulating columns 1E shown in FIG. 5, are added to the respective steps 7 shown in FIG.
They are joined in three steps at equal intervals at the same intervals as the joining intervals of A and 7B.

A flange portion is joined to the lower end and the upper end of each insulating support column 1A in the same manner as the insulating support columns 1E and 1F shown in FIG. 5, and via a bolt inserted into a tightening hole formed in the flange portion. The lower end is fixed to the pedestal 2.

A supporting plate, which will be described later with reference to FIG. 2, is provided on both sides of the thyristor module 5 on the flange portion joined to the upper end of each insulating column 1A. On the upper surfaces of these support plates, the lower ends of the short insulating support columns 1B are placed via the flange portions joined to the lower ends of the insulating support columns 1B, and the support plates protruding from the flange portions and the thyristor module 5 are provided. Also, the flange portion joined to the upper end of the insulating column 1A is tightened with bolts.

On the upper end surface of the insulating column 1B, a ceiling frame 4 made of chevron steel and having a frame shape in a plan view (not shown) is placed. The ceiling frame 4 is fixed to the insulating support column 1B via a flange portion joined to the upper end of each insulating support column 1B.

In the thyristor valve thus constructed, the floor plate 15 incorporated in the central portion of the conventional thyristor valve shown in FIG. 5 can be omitted, so that the structure can be simplified and Since the overall height can be reduced, the height of the valve hole building can also be reduced.

Further, in terms of the assembly work at the installation site, only the work of fixing the ceiling frame 4 to the upper end of the insulating support column 1A in which each thyristor module 5 is incorporated via the insulating support column 1B is required, and the weight is reduced. Work becomes easy.

Further, since the insulating column 1A supporting the light weight thyristor module 5 is placed and fixed on a continuous material having no connecting portion, its strength should be increased as compared with the conventional thyristor valve shown in FIG. You can

FIG. 2 is a partially enlarged detailed view showing another embodiment of the thyristor valve of the present invention, showing the upper stage portion of the thyristor valve shown in FIG. 2 is different from FIG. 1 in that a rectangular insulating seat 7C in a plan view (not shown) is sandwiched between bolts 9 between upper left and right insulating columns 1B and lower insulating columns 1A. And between the insulating pillar 1B located at the center and the lower insulating pillar 1A,
An insulation seat 7D, which is longer in the left-right direction than the insulation seat 7C, is placed in advance. A pair of bolt holes for fixing to the flange portion 1a at the upper end of the insulating column 1A are provided in front of and behind the central portions of the insulating seats 7C and 7D, and these bolt holes have counterbore holes on the upper surface. Has been formed.

In the thyristor valve having the connection portion of the insulating columns 1A and 1B as described above, the ceiling frame 4 and the insulating column 1B are shipped as separate packages due to transportation restrictions. In that case, the uppermost thyristor module 5 is fixed to the upper end of the insulating column 1A via the insulating seats 7C and 7D and the flange portion 1b.

At the site of installation, with the insulating support 1B fixed to the ceiling frame 4, the insulating support 7 is mounted via the insulating support 1B.
Place on top of C, 7D. For fixing to the lower insulating support 1A, both sides of the flange portion 1b joined to the lower end of the insulating support 1B and both sides of the upper flange portion 1a of the insulating support 1A are fastened with bolts 9A.

Therefore, in the thyristor valve having such a structure, like the thyristor valve shown in FIG. 1, in the work of fixing the ceiling frame 4 and the insulating support 1B, both sides of the thyristor module 5 are transported at the time of transportation. The projecting support plate can be performed without removing the bolts tightened to the flange portion joined to the upper end of the insulating column 1A.

FIG. 3 is a partially enlarged view showing a state in which the suspension frame 11 is attached for transporting or installing the thyristor valve shown in FIG. In FIG. 3, the insulating seats 7C, 7 mounted and fixed on the upper end of the insulating column 1A are fixed.
On the upper surface of D, metal struts 3 each having an annular flange welded to the upper and lower ends of the short steel pipe are placed, and are fixed to the flange portion 1a at the upper end of the insulating stanchion 1A by bolts.

On the upper end faces of these metal columns 3, a hanging frame 11 made of large chevron-shaped steel in a frame shape is placed, and bolts are attached via flanges welded to the upper ends of the respective metal columns 3. It is fixed.

On the upper surface of the suspension frame 11, suspension bolts 14 are fixed at the positions of the upper portions of the metal columns 3, respectively. Reference numeral 13 indicates one of the suspension wires used for carrying and installing the thyristor valve thus constructed.

Next, FIG. 4 is a partially enlarged detailed view showing another embodiment of the thyristor valve of the present invention, which corresponds to FIGS. 1 and 2 and corresponds to the thyristor valve of the invention according to claim 2. FIG.

In FIG. 4, what is different from FIGS. 1 and 2 is that a slightly long insulating strut 1C is incorporated into the upper end of the insulating strut 1A shown in FIGS. The insulator 6 is incorporated between the upper end of the insulating column 1C and the ceiling frame 4.

That is, the upper end surface of the insulating support column 1C is substantially level with the upper surface of the uppermost thyristor module 5. A pleated insulator 6 is placed on the upper surface of the flange portion 1c joined to the upper end of the insulating strut 1C, and the lower end of the pleated insulator 6 is embedded in the upper portion and is fixed in a vertical sectional view (not shown). It is fixed to the flange portion 1c with bolts through a letter-shaped fixing metal fitting 6a.

Further, the upper end of the pleated insulator 6 is provided at the upper end of the pleated insulator 6, and the lower portion is embedded in the upper portion of the pleated insulator 6 via a fixing metal fitting 6b which is the same as the fixing metal fitting 6a. , Is suspended from the ceiling frame 4 by bolts.

In the thyristor valve thus constructed, the insulation creepage distance between the uppermost thyristor module 5 and the ceiling plate 4 provided above the thyristor module 5 is set to the insulation type creeper 6 Since it can be increased by the above, it is possible to suppress the insulating gap required between the thyristor module 5 and the ceiling frame 4 to the minimum value.
Therefore, the height of the thyristor valve installed in the valve hole can be suppressed.

[0037]

As described above, according to the invention of claim 1,
A first insulating pipe for suspending the thyristor module is erected on the bottom frame between a plurality of flange portions formed on the outer periphery of the columnar portion, and the first insulating pipe is provided with respect to the upper end of the first insulating pipe. , By arranging the second short insulating pipe to which the ceiling frame is fixed at the upper end, a plurality of thyristor modules suspended in upper and lower stages can be connected to one first insulating pipe having no connecting portion through the flange portion. Since the height of the thyristor valve is reduced during transportation and installation, the thyristor valve can be provided with high reliability because it does not need to be disassembled during transportation and can be easily restored at the installation site.

According to the second aspect of the present invention, the second short insulating pipe is a pleated insulator, so that a plurality of thyristor modules suspended in a multi-stage structure are connected to each other without a connecting portion. The thyristor valve is highly reliable because it is suspended from the first insulation pipe via the flange and the height during transportation and installation is reduced, so disassembly during transportation is not necessary and restoration at the installation site is easy. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a thyristor valve of the present invention.

FIG. 2 is a partially enlarged detailed view showing another embodiment of the thyristor valve of the present invention.

FIG. 3 is a partially enlarged detailed view showing the operation of the thyristor valve of the present invention.

FIG. 4 is a partially enlarged detailed view showing another embodiment of the thyristor valve of the present invention.

FIG. 5 is a perspective view showing an example of a conventional thyristor valve.

[Explanation of symbols]

1A, 1B, 1C ... Insulating columns, 1a, 1b, 1c ... Flange part, 2 ... Stand, 3 ... Metal columns, 4 ... Ceiling frame, 5 ... Thyristor module, 6 ... Hatch insulator, 7A, 7B,
7C, 7D ... Insulation seat, 8 ... Insulation tube, 9A, 9B,
10 ... Bolts, 11 ... Hanging frames, 13 ... Hanging wires, 14 ... Hanging bolts.

Claims (2)

[Claims] 1. A first insulating pipe for suspending a thyristor module between a plurality of flange portions formed upright on a bottom frame and formed on the outer periphery of a cylindrical portion, and the first insulating pipe.
A thyristor valve equipped with a second short insulating pipe which is erected on the upper end of the insulating pipe and has a ceiling frame fixed to the upper end. 2. The thyristor valve according to claim 1, wherein the second short insulating pipe is a pleated insulator.