JP2996852B2 - Thyristor valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thyristor valve used for a power transmitting end and a power receiving end of a DC power transmission facility, a frequency conversion facility, and the like, and more particularly to a thyristor valve having an insulating column with enhanced seismic resistance. .

[0002]

2. Description of the Related Art Air-insulated thyristor valves used in DC power transmission equipment and frequency conversion equipment for interconnection between different frequency power systems require high-capacity thyristor valves as the capacity increases and the voltage and current increase. It is becoming larger and larger.

[0003] On the other hand, in order to reduce the required floor area of a valve hole in which a thyristor valve is installed, a higher-rise thyristor valve is required more and more. Therefore, a thyristor valve having a larger capacity must be formed of an insulating support column having a sufficient strength.

[0004] Air-insulated thyristor valves require a glass fiber reinforced plastic (hereinafter, referred to as having a bending stress of about 10 times or more as compared with insulators) due to the need for insulation strength corresponding to a higher voltage and the above-mentioned mechanical strength. FRP) is conventionally used.

Hereinafter, an example of a conventional thyristor valve will be described with reference to FIGS. 5 is a connection diagram for one phase of a thyristor valve, FIG. 6 is a front view of one phase of a conventional thyristor valve, and FIG. 7 is a cross-sectional view taken along line BB of FIG. 5, 6 and 7, the thyristor valve includes, as shown in FIG. 5, a thyristor stack 5 in which a plurality of thyristor elements 4 are connected in series / parallel, a pair of anode reactors 6, which are auxiliary circuits thereof, and a damping circuit. As shown in FIGS. 6 and 7, a thyristor module 8 containing a resistor, a capacitor and the like of a voltage dividing circuit 7 also serving as
It is constructed by stacking several stages on a FRP insulating support column 1 via a module support plate 10 and connecting them with conductors (not shown).

Reference numeral 9 shown in FIG. 5 is a light guide for transmitting an optical signal to the thyristor element 4, and reference numeral 12A shown in FIG.
Is an upper frame of the thyristor valve, reference numeral 12B is a lower frame, reference numeral 13 is a lower base fixed to the installation floor, and reference numeral 14 is an FRP insulating support column for insulatingly supporting the thyristor module 8 from the installation floor.

[0007] Of these, the lower base 13 is fixed to the installation floor of the valve hole by a terrain bolt (not shown). Also, as shown in FIG. 3 (b), at the lower end of the insulating support 1,
A flange 3 is screwed to the outer periphery, and a reinforcing tube 2B is inserted and joined to the inner periphery. The same applies to the lower end of the insulating support post 14.

In the thyristor valve configured as described above, if an earthquake occurs, a large stress is generated on the insulating support 1 of the thyristor valve by rolling. In particular, a large stress is generated in the insulating column 1 near the flange 3, which is the lowermost fixed portion.

[0009]

However, in the thyristor valve configured as described above, the reinforcing pipe 2B
Is used as a reinforcing member for the mounting portion of the flange 3, and is often short. For example, when an earthquake occurs, the maximum bending stress is generated at the fixed end of the flange 3, and the bending due to bending may increase. In addition, there is a possibility that the earthquake resistance of the thyristor valve is reduced. Therefore, an object of the present invention is to provide a thyristor valve having excellent seismic strength and capable of reducing an installation floor area.

[0010]

According to a first aspect of the present invention, a plurality of thyristor modules are mounted on an upright cylindrical insulating support column in multiple stages, and an insulating reinforcing pipe is provided inside an end of the insulating support column. The inserted thyristor valve is characterized in that the length of the reinforcing tube is set to be 1 to 3 times the outer diameter of the insulating column, and the inner thickness of the reinforcing tube is smaller than the thickness of the insulating column.

[0011]

[Function] With the occurrence of an earthquake, the position where the stress generated at the fixed part at the lower end of the insulating support post due to the swing of the thyristor mounted on the insulating support post becomes the maximum distance from the end in proportion to the length of the reinforcing pipe , The maximum stress value is reduced.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of the present invention, in which only an insulating post 1 is shown, and FIG. 2 shows a mounting state of a flange 3 and a reinforcing pipe 2 at upper and lower ends of the insulating post 1 shown in FIG. It is a longitudinal section enlarged detailed view.

The insulating column 1 is an insulating cylinder formed by impregnating a glass cloth with an epoxy resin or the like as a binder and winding it around a cylindrical mold in the same manner as in the prior art.
Machine the inner and outer perimeters of both ends. In this machined part, a connecting agent is applied to the outer periphery of a reinforcing pipe 2 whose thickness is thinner than the thickness of the insulating pillar 1 (note: 80% of the thickness of the insulating pillar 1), and is fixed. A metal flange 3 is similarly applied to the outer peripheral portion of the support column 1 by applying an adhesive and fixed.

A module support plate 10 for mounting the above-described thyristor module 6 by a required number of steps is attached to the intermediate portion of the insulating support by bonding with epoxy resin. The mounting structure of the thyristor module 8, the upper frame 12A, the lower frame 12B, and the lower base 13 are the same as the conventional one.

FIG. 3 (a) shows the bending deflection of a long insulating support column 1 of a reinforcing tube 2A used for a thyristor valve according to the present invention, and FIG. 3 (b) shows a conventional insulating tube having a short reinforcing tube 2B. It is explanatory drawing which shows the bending deflection of the support | pillar.

As shown in FIG. 3A, when the reinforcing pipe 2A is made longer, the bending is reduced. The place where the maximum stress occurs in the insulating support 1 is located at A1 near the end of the reinforcing pipe 2A.
In the case of the present invention in which the reinforcing pipe 2A is long, the maximum stress portion is located at a position away from the flange 3.

On the other hand, in FIG. 2B, which shows an insulating post of a conventional thyristor valve having a short reinforcing pipe 2B, the deflection is large due to the moment corresponding to the load of the thyristor module when an earthquake occurs.

When the reinforcing tube is lengthened, the location of the maximum stress generated in the insulating support moves accordingly. The magnitude of the stress decreases as the length of the reinforcing pipe increases, as shown in the graph of FIG. Even when the thickness of the reinforcing pipe is increased, as shown by the broken line in FIG. 4, the effect is almost the same as in the case of the present invention, and the effect of reducing the stress is not so different from that of the present invention.

Further, the place where the maximum stress is generated is the insulating support 1
Because it is located at a position away from the flange 3 which is a fixed part of the above, the seismic strength is improved. Thus, the maximum bending stress generated in the insulating support 1 can be reduced by inserting and fixing the reinforcing pipe having a smaller thickness than the insulating support 1 rather than increasing the thickness of the reinforcing support. .

[0020]

As described above, according to the first aspect of the present invention,
In a thyristor valve in which a plurality of thyristor modules are mounted in multiple stages on an upright cylindrical insulating support column and an insulating reinforcing tube is inserted inside the end of the insulating support column, the length of the reinforcing tube is set outside the insulating support column. By making the inner diameter of the reinforcing pipe less than the thickness of the insulating support pillars by setting it to 1 to 3 times the diameter,
As the thyristor mounted on the insulating column swings, the position where the stress generated at the fixed part at the lower end of the insulating column becomes maximum is separated from the end in proportion to the length of the reinforcing pipe, reducing the maximum stress value. In addition, it is possible to provide a thyristor valve having excellent seismic strength and capable of reducing the installation floor area.

[Brief description of the drawings]

FIG. 1 is a partial detailed view showing one embodiment of a thyristor valve of the present invention.

FIG. 2 is a detail view of a partially enlarged longitudinal section of FIG. 1;

FIG. 3A is an explanatory view showing the operation of a thyristor valve according to the present invention, and FIG. 3B is an explanatory view showing the operation of a conventional thyristor valve.

FIG. 4 is a graph showing an operation of the thyristor valve of the present invention, which is different from FIG. 3 (a).

FIG. 5 is a connection diagram showing a thyristor module mounted on a conventional thyristor valve.

FIG. 6 is a front view showing an example of a conventional thyristor valve.

FIG. 7 is a plan view of FIG. 6;

[Explanation of symbols]

1,14 ... insulating column, 2A ... reinforcement pipe, 3 ... flange, 4 ...
Thyristor element, 5: Thyristor stack, 6: Anode reactor, 7: Voltage dividing circuit parts, 8: Thyristor module, 9: Light guide, 10: Module support plate, 11
... thyristor valve, 12A ... upper frame, 12B ... lower frame, 13 ... lower base.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeru Tanabe 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation (56) References JP-A-57-167668 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) H01L 25/00

Claims (1)

(57) [Claims] 1. A thyristor valve in which a plurality of thyristor modules are mounted on an upright cylindrical insulating support post in multiple stages, and an insulating reinforcing tube is inserted inside an end of the insulating support post. The length should be one of the outer diameter of the insulating support.
A thyristor valve wherein the thickness of the reinforcing tube is less than the thickness of the insulating support column.