JPS593114B2 - thyristor valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thyristor valve, and particularly to a thyristor valve that is most suitable for providing an earthquake-resistant structure.

Air-insulated thyristor valves are usually installed inside a building called a valve hall. What is shown in FIGS. 1 and 2 is one example. In Figures 1 and 2, only the busbar between the thyristor valve and the transformer is shown, but there are also busbars between the lightning arrester and the valve, and the busbar between the valve and the valve, although not shown in the figures. There is also a connection pipe with the DC bus. Here, the distance between adjacent valves (C) and the distance between valves and transformers (D) are determined to be the minimum required for maintenance and insulation distance in order to minimize the floor area of the valve hole in order to reduce construction costs. You need to narrow it down to a value.

Air-insulated thyristor valves often use reinforced plastic (FRP) as the main structural material for electrical insulation reasons.

However, 5FRP material has a longitudinal elastic modulus of about 25 to 30% compared to insulator, which is the same insulating material, but has an allowable stress of about 10 times. This shows that FRP deforms more easily than insulators and can withstand much larger deformations than insulators. An example of a thyristor valve that has been planned in the past is shown in Figures 3 and 4.According to a trial calculation that takes into account the characteristics of FRP, the DC voltage is 250KV.
) In a thyristor valve with a conversion capacity of 3OOMV, the maximum single amplitude of the thyristor valve 75 lube reaches 74 (V!) when the primary resonance frequency is near 1H2 and the excitation force of 3G. In the arrangement shown in Figures 2 and 2, tension will be generated between the transformer bushing and other equipment via the bus bar, which may damage the equipment and bushing.F0 Avoid such situations. Therefore, it is conceivable for outdoor equipment to bend the busbar in the air as shown in Figure 5 a, b, and c, but if this is done indoors, the valve hole must be made larger to ensure insulation distance. This had the disadvantage of increasing construction costs.

An object of the present invention is to provide a thyristor valve having a structure that increases rigidity in at least one direction of the thyristor valve.

The present invention specifies that the vertical plane parallel to the axial direction into which the bus bar connected from the outside enters is a plane that does not involve opening and closing when inspecting the thyristor valve, and the direction along this plane By increasing the rigidity with respect to the applied force, displacement of the thyristor valve within the plane during vibration is suppressed.

35 FIG. 6 is a front view showing an embodiment of the present invention.

Further, FIG. 7 is a sectional view taken along the line ■--■ of the embodiment shown in FIG. The thyristor valve has an FRP support column 21, a tray 22,
It consists of a busbar connection terminal 23, an insulating plate wall 24, a column support 25, and a frame 26.

The tray 22 accommodates attached electric circuits and the like, and has a structure that allows it to be pulled out for repair and inspection. Both sides in FIG. 6 are drawable surfaces, and the front surface B is a non-drawable surface. From its appearance, a thyristor valve can be modeled as a cantilever beam in response to forces acting in the horizontal direction.

It is well known that the deflection δ of a cantilever beam in response to an external force is given by when the load is concentrated, and in equation (1), the A term gives the displacement due to bending, and the second term gives the displacement due to shearing. .

When the excitation force acts in the direction parallel to the A plane, that is, in the X-axis direction, the plate wall 24 receives the force in the thickness direction and does not act as a strength member, and the main support 21 receives all the force. .

Therefore, the change δx in the thyristor valve in this case is dominated by the displacement due to bending given by, and this magnitude is not significantly different from that in the conventional system.

On the other hand, in response to a force parallel to the B plane, that is, in the Y-axis direction, the plate wall material will receive in-plane stress, and the displacement of the thyristor valve will be dominated by shear deformation given by.

A trial calculation for a thyristor valve with a DC voltage of 250 KV and a conversion capacity of 300 MW is as follows. By drawing the external bus bar in the direction of the Y-axis, the force caused by the vibration of the thyristor valve during an earthquake can be prevented from spreading to the transformer and other equipment. It can be suppressed.

Note that the deflection in the X-axis direction is a direction perpendicular to the axis of the busbar, and the spread of force to other devices due to a change in this direction can be absorbed by normal busbar routing technology. FIGS. 8 and 9 are front views showing other embodiments of the present invention.

The embodiment shown in Figs. 8 and 9 differs from the embodiment shown in Fig. 6 in that the B side is made into a truss structure in order to suppress the displacement of the thyristor valve in the Y-axis direction where the generatrix enters. be.

As a result, relatively short FRP insulating rods 101 and 102 can be used instead of the large plate wall materials shown in FIG. 6, which has the advantage of simplifying the handling of materials during assembly. According to the embodiments of the present invention, it is possible to suppress the displacement of the thyristor valve in the length direction of the bus bar connecting the air-insulated thyristor valve and other equipment, and there is no need to greatly deflect the bus bar, so that Space can be used effectively.

This has the advantage of reducing the size of the valve hole, thereby reducing construction costs. As is clear from the above, according to the present invention, displacement of the thyristor valve during vibration can be suppressed.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an example of a valve hole, Figure 2 is a front view of the valve hole in Figure 1, Figure 3 is a front view of a conventional thyristor valve, and Figure 4 is another conventional thyristor valve. FIGS. 5A, b, and c are explanatory diagrams of the conventional case where the generatrix is deflected in space. FIG. 6 is a front view showing the first embodiment of the present invention. FIG. 7 8 is a front view showing the second embodiment of the present invention, and FIG. 9 is a front view showing the third embodiment of the present invention. 11... Valve hole, 12... Thyristor valve, 14... Bus bar, 21...
・FRP pillar, 22...Tray, 23...
...Bus bar connection terminal, 24...Insulation plate wall, 25.
...Pole support, 26...Frame.

Claims (1)

[Claims] 1. In a thyristor valve equipped with a terminal for connection to a bus bar used for connecting external equipment, the terminal is configured so that the rigidity is higher in the direction of connection with the bus bar than in other directions. Features a thyristor valve.