JPH0284068A - Thyristor valve for high voltage - Google Patents

Abstract

PURPOSE:To improve earthquake resistance in simple construction without making an insulating push brace large in size by providing an oscillation absorbing plumb bob member of which specified mass ratio and specified fixed oscillation frequency to a thyristor module are determined. CONSTITUTION:An insulating push brace 9 used for a thyristor valve for high voltage is composed of a cylindrical main body 17 and a cover 18. At an end of the main body 17 a flange section 13 is formed and along the shaft line a hollow section 15 is formed. An oscillation absorbing plumb bob member is composed of a rod 31 and a plumb bob 22. Viscous fluid 23 is filled up into the hollow section 15 to which the oscillation absorbing plumb bob member is enclosed. The installation of the cover 18 to the main body 17 is performed by forming a through hole 26 to insert a bolt 25 to a spot facing hole 24 formed to the cover 18, and by fastening the bolt 25 to a screw hole 27 formed to the main body 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a high voltage thyristor valve used when performing AC/DC conversion.

(Prior Art) Conventionally, high-voltage thyristor valves (hereinafter referred to as thyristor valves) are classified into several types depending on insulation and cooling methods. Among these, air-insulated thyristor valves are installed in a multi-layer structure, that is, a tower structure, inside the building, which reduces floor space, reduces construction costs, and facilitates maintenance and inspection. There is. This conventional thyristor valve will be explained based on FIGS. 3 to 7.

FIG. 3 shows that thyristor valves la, lb, and lc are installed in valve hole 2, and thyristor valves la, 1
FIG. 3 is a plan view showing a state where b+1' is connected to the transformer 3; Thyristor valves la and lb arranged for each three phases
, lc are installed on the floor, and on the three-phase AC receiving side of each thyristor valve la, lb, lc are main circuit busbars 5a, 5b drawn from the transformer 3 into the valve hole 2 and supported by the bushing 4. , 5c are connected. The DC output sides of each of the thyristor valves 1 M, 1 b, and 1 c are connected in parallel by a main circuit output bus 6, which is supported by a bushing 4 and drawn out from the valve hole 2.

FIG. 4 is a side view of FIG. 3, in which a base frame 8 is provided on the floor surface 7 of the valve hole 2. An insulating column 9 is erected on this base frame 8, and a frame 10 is attached on top of the insulating column 9. A single valve 11 at the lowest stage is mounted on the frame 10, and three single valves 11 are assembled upwardly by an insulating column 9 via the frame 10. The single valve 9 is composed of a plurality of thyrisk modules 12 each composed of a thyrisk element and its auxiliary circuit. Thyristor valves la, l stacked like this
Between the upper two stages and the lower two stages of the single valve 11 among b and lc, there is a main circuit bus 5a from the transformer 3, as shown in FIG.

5b and 5c are drawn in.

The above-mentioned insulating column 9 has high insulating properties and sufficient strength. In other words, even if vibrations occur due to an earthquake or the like, the thyristor valve la remains unchanged.

This prevents the insulating column 9 from being destroyed due to swinging of the thyristor valves lb and lc, and especially from the application of a large bending moment to the portions of the thyristor valves la, lb and lc near the base frame 8.

FIG. 6 is a sectional view of the insulating column 9. The upper and lower parts of the insulating column 9 are flange portions 13, and the flange portions 13 have mounting holes 14 formed therein. This mounting hole 14
are screwed between adjacent insulating columns 9 via the frame 10. A hollow portion 15 is formed along the axis of the insulating column 9.
are formed, and the portion between the upper and lower flange portions 13 serves as fins 16 for cooling. Such an insulating support 9
Insulators and reinforced plastics (FRP) are used for this purpose, but these generally have lower strength than metals, so they are larger, and the lower the part, the more the load is applied.

As a countermeasure to the above-mentioned problems, there are thyristor valves la, lb, and lc of a suspended structure type as shown in FIG. These thyristor valves la, lb, lc are described in the following documents:

CIGRE InternationalConfe
Rence on LargeHigh Vol.
stage Electric Systems 19
82 5ession1-9 september
14-7A New Concept for
Mechanical Design of Thy
ristor Valves for HVDCby
S, Berggren.

Another well-known company is ASEA.

Thyristor valves la and lb shown in FIG.

The IC has a structure in which it is suspended from the ceiling of the valve hole 2 via an insulating member 9. The advantage of this structure is that the natural frequency can be made extremely low, making it possible to realize a flexible earthquake-resistant structure. Furthermore, since the structure of the thyristor valves la, ib, and lc themselves is of a hanging type, only the tensile strength of the insulating support column 9 needs to be considered, and bending stress can be ignored.

(Problem to be Solved by the Invention) However, in order for the insulating support of the thyristor valve explained based on FIGS. 3 to 6 to have sufficient strength against vibrations such as earthquakes, the insulating support Because of their large size, their weight increases and they become expensive.

On the other hand, in the case of the thyristor valve shown in FIG.
For 0KV, one thyristor valve costs 30
The size of the valve hole is more than 1,000 ton, and using three metal parts for each phase means that the valve hole becomes large compared to the size of the thyristor valve in order to provide sufficient strength to the valve hole.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a high-pressure thyristor valve that has a simple structure and improved earthquake resistance without increasing the size of the insulating column.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a high-voltage thyristor module consisting of a thyristor module including a thyristor element and an attached circuit, and an insulating column supporting the thyristor modules stacked in multiple stages. In the thyristor valve, a support member that supports the weight body is fixed to the weight body, and an end of the support member extending from at least one of each end of the weight body is attached to an inner wall of a hollow portion formed in the insulating column in the axial direction of the insulating column. The vibration-absorbing weight member is fixed along the axis and has a predetermined mass ratio and a predetermined fixed frequency relative to the silisk module.

(Function) The high-voltage thyristor valve configured as described above has a vibration-absorbing weight member consisting of a support member and a weight body that has a predetermined natural frequency and a predetermined mass ratio to the thyristor module. As a result, when vibrations are received due to earthquakes, etc., the vibration absorbing weight member absorbs the vibrations, which reduces the response of the vibrations received by the Cyrisk modules stacked in multiple stages, and is transmitted to the Cyrisk modules. Suppress vibration.

(Example) Examples of the present invention will be described below based on the drawings. 1st
The figure shows an example of the structure of an insulating column 9 used in the high-voltage thyristor valve of the present invention. This insulating support 9
As already explained in the prior art section, these are similarly used in the thyristor valves la, lb, and lc shown in FIG. Since the insulating support column 9 according to the present invention has the same configuration as the conventional one, the same reference numerals are given to the configuration and detailed explanation thereof will be omitted. First, the insulating column 9 consists of a cylindrical main body 17 and a lid part 18, and a flange part 13 is formed at one end of the main body 17. A mounting hole 14 is formed in the flange portion 13, and as already explained based on FIG. .

A hollow portion 15 is formed along the axis of the main body 17, the flange portion 13 side is a bottom portion, and the other end of the main body 17 is an opening portion. A ring groove 19 is formed on the other end surface of this opening, and an O-ring 20 is fitted into this ring groove 19. A lid portion 18 is attached from above this O-ring 20 to seal the hollow portion 15. One end of a rod 21 is fixed to a portion of the lid portion 18 that substantially coincides with the axis of the main body 17. This fixing method includes welding the rod 21 to the lid 18, or forming a thread on the rod 21 and screwing it into a screw hole formed in the lid 18. A weight 22 having a predetermined mass is formed at the other end of the rod 21. This weight 2
2 is also welded in the same way as one end of the rod 21 described above,
It's like screwing it in.

In this way, the rods 21 and 1122 constitute a vibration absorbing weight member. The hollow portion 15 housing the vibration absorbing weight member is filled with a viscous fluid 23. The level of the viscous fluid 23 is filled so that there is some gap between it and the lid 18 in consideration of thermal expansion due to temperature changes. This viscous fluid 23 is oily or resinous.

When attaching the lid part 18 to the main body 17, a through hole 26 for passing the bolt 25 is further formed in the counterbore hole 24 formed in the lid part 18, and the bolt 25 is tightened into the screw hole 27 formed in the main body 17. It is done by The lid part 18 has the same size as the flange part 13 and has a mounting hole 14 on the same axis as the mounting hole 14 formed in the flange part 13.

The insulating support column 9 having the above structure supports the thyristor valves la, lb, and lc as shown in FIG. Now, when an earthquake occurs and vibration is applied to the insulating column 9, if the natural frequency and damping rate of the vibration absorbing weight member are set to predetermined values, the vibration transmitted to the thyristor valves la, lb, and lc will be suppressed. Reduce. A description will be given of how to determine the natural frequency and damping rate of the vibration absorbing weight member that acts in this manner.

The natural frequencies of thyristor valves la, lb, and lc are Ωn
, the mass of the weight 22 is m, and the equivalent mass ratio between this quality i1m and the quality ff1M of the thyristor valves la, lb, and lc is μ
Then, the natural frequency ωn of the vibration absorbing weight member is the following (1
) is given by the formula.

However, μmm/M ωn=(1/1+μ)Ωn (1) From the equation (1), the quality iM and the natural frequency Ωn are determined from the assembled thyristor valves la, lb, and lc. The isometric mass ratio μ is an empirical value, and takes a value of 0.05 to 0.5. By selecting the isometric mass ratio μ in this manner, the natural frequency ωn of the vibration absorbing weight member is determined. Note that once the isometric mass ratio μ is determined, the mass m of the weight 22 is determined.

On the other hand, the natural frequency ωn of the vibration absorbing weight member and the weight 22
Since there is a relationship ωn - J k / m between the quality Jim, the spring constant k is determined from this equation, and the length of the rod 21, Young's modulus, and cross section of the rod 21 are determined so that the spring constant is k. The specifications of the rod 21 can be determined by selecting a bending moment determined by the shape.

Next, determine the optimal attenuation rate ζ. This optimal damping rate ζ
is to reduce the vibrations transmitted to the rethyristor valves la, lb, and lc over the entire frequency of vibrations received from the outside, and this optimal damping rate ζ is determined by the equivalent mass μ as shown in the following equation (2). It is expressed as

(2) Since the mass ratio μ is known, the optimal attenuation rate ζ can be found.

On the other hand, the damping rate ζ of the vibration absorbing weight member is expressed by the following equation (3) using the mass m, the natural frequency Ωn of the thyristor valves la, lb, and lc, and the damping constant C. By substituting the damping factor ζ obtained by equation (2) into the equation (3) so that the damping factor ζ obtained by ti!Ic is determined. This damping constant C is a value that determines the viscosity of the viscous fluid 23, and the viscous fluid 23 having a viscosity of this value is
By filling the insulating column 9 with the insulating column 9, vibration energy is absorbed over all frequencies of vibrations received by the insulating column 9, and the response of the vibrations received by the thyristor valves la, lb, and lc is reduced.

As described above, the specifications of the vibration absorbing weight member are determined, and the viscosity of the viscous fluid 23 is given, so that the insulating column 9 is assembled. The thyristor valves la, lb, and lc supported by this insulating column 9 are of a one-degree-of-freedom system, and the thyristor valve la is a thyristor valve la.

The state when lb and lc are subjected to vibration due to an earthquake will be explained based on FIG. 2. Figure 2 shows thyristor valve 1
It shows that the vibration response received by a+ 1b+ 1' is reduced by the vibration absorbing weight member, and the horizontal axis shows the arbitrary frequency Ω applied to the thyristor valve la+1b+IC and the natural frequency of the thyristor valves la, lb, and lc. The frequency ratio with Ωn is taken, and the vertical axis shows the response magnification of the thyristor valves la, lb, and lc with respect to an arbitrary vibration frequency Ω. and thyristor valves la, lb.

It is shown that when a vibration of an arbitrary frequency Ω is applied to 1c, the response magnification of the thyristor valves la, lb, and lc becomes smaller as the mass ratio μ becomes larger. Incidentally, the thyristor valve la when the vibration absorbing weight member is not attached, that is, when the mass ratio μ-〇.

The attenuation rates for lb and lc are shown as 5%.

In this way, compared to the conventional case where a vibration absorbing weight member is not attached, that is, the response magnification when the mass ratio μm is 0, the mass ratio μ
It can be seen that the response magnification when m0.01 to μm0.5 becomes small over all frequencies. In particular, when the mass ratio is 0.05 μm or more, the response magnification becomes less than half, and the earthquake causes damage to the thyristor valves 1a, 1b,
Even if vibration of an arbitrary frequency is applied to the ultimate support column 9 that supports 1c, the vibration absorbing weight member and the viscous fluid 23
The vibration energy is absorbed by the thyristor valve l.
It is possible to significantly reduce the response of vibrations received by a, lb, and lc.

Although the vibration absorbing weight member of the above-described embodiment was attached with the rod 21 and the weight 22 hanging downward from the lid 18, the rods 21 were fixed above and below one weight 22, and the upper rod 21 It is also possible to fix the rod 21 to the lid part 18 and the rod 21 to the flange part 13 on the lower side. Further, the rod 21 and the weight 22 are suspended from the lid part 18, while the flange part 13
The rod 21 and weight 22 can also be erected from there. Furthermore, a spring member can also be used instead of the rod 21.

In the above embodiment, the thyristor valve la.

The vibrations applied to lb and lc are likened to an earthquake, but when a large rotating machine such as a diesel engine is installed near the thyristor valves la, lb and lc, vibrations of a specific frequency generated by the rotating machine can be Thyristor valve l
It is possible to reduce the response of vibrations received by a, lb, and lc. At this time, since it is only necessary to reduce the response to vibrations of a specific frequency, there is no need to fill the hollow portion 15 of the insulating column 9 with the viscous fluid 23.

The insulating support 9 used in the above embodiment has almost the same shape as the conventional one shown in FIG. 6, and the upper flange 13 is separated from the main body 17 as shown in FIG. 18, attach a vibration absorbing weight member to the lid part 18,
Since the structure of the insulating support column 9 of the present invention shown in FIG. 1 can be obtained by simply screwing the lid portion 18 to the main body 17, there is no need to make any major design changes, resulting in an inexpensive structure.

〔Effect of the invention〕

As described above, in the high-voltage thyristor valve of the present invention, a support member that supports the weight is fixed to the weight, and the end of the support member extending from at least one of one side and the other of the weight is connected to an insulating support. A vibration absorbing weight member is fixed to the inner wall of the hollow part formed in the axial direction and has a predetermined mass ratio and a predetermined fixed vibration frequency relative to the thyristor module. Even if vibration is applied to the Cyrisk module, the vibration energy will be absorbed by the vibration absorbing weight member, reducing the vibration response received by the Cyrisk module, and suppressing the vibration transmitted to the Cyrisk module. Earthquake resistance can be improved with a simple structure without the need for

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an insulating column used in the high-voltage thyristor valve of the present invention, Fig. 2 is a graph showing how the vibration-absorbing weight member reduces the response of vibrations received by the thyristor valve, and Fig. 3 is a plan view showing an installation example of a conventional thyristor valve, FIG. 4 is a side view shown by the arrow A-A in FIG. 3, FIG. 5 is a wiring diagram of the thyristor valve shown in FIG. 3, and FIG. 6 is a conventional Cross-sectional view showing the insulating support column, No. 7
The figure is a side view showing another example of a conventional thyristor valve. la, lb, lc...thyristor valve, 2...valve hole, 3...transformer, 9...insulation support, 12
... Thyristor module, 13... Flange part,
15...Hollow part, 17...Main body, 18...Lid part,
21. 22... Vibration absorbing weight member (rod, weight), 2
3...Viscous fluid. Applicant's agent Sato - male, sea bream, 1 figure η Ku gravity number 1 person 2 figure horse 4 figure 3 figure 5 figure ko 6 figure

Claims (1)

[Scope of Claims] A high voltage thyristor valve comprising a thyristor module comprising a thyristor element and an auxiliary circuit, and an insulating column supporting the thyristor module stacked in multiple stages, comprising: a support member supporting the thyristor module on a weight body; and fixing an end of the support member extending from at least one of each end of the weight body to an inner wall of a hollow portion formed in the insulating column along the axial direction of the insulating column, thereby producing the thyristor module. 1. A high voltage thyristor valve comprising a vibration absorbing weight member having a predetermined mass ratio and a predetermined fixed frequency.