JPS622703B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thyristor valve, and in particular, a coolant pipe (also serving as insulation) suitable for a case where thyristor modules connected in series are installed in multiple stages.
This invention relates to a liquid-cooled thyristor valve.

Conventionally, coolant piping for this type of thyristor valve has been laid by extending from the ground for each stage of each thyristor module constituting a multistage thyristor valve. For example, in the case of a thyristor valve in which each stage is composed of a plurality of thyristor modules connected in series, and these are stacked in three stages and connected in series, the method is to separately install piping from the ground to the thyristor modules in each stage.
In this method, the voltage applied to the pipes connected in each stage is the potential difference between each stage and the ground, so a larger voltage is applied to the pipes installed in the upper stage. Therefore, the piping laid in the upper stage must have an electrical insulation length (for example, about 15 mm per 1 kV), so the length of the pipe should be longer than the distance between the thyristor module and the ground by meandering, etc. The drawback was that it had to be quite long.

An object of the present invention is to provide a liquid-cooled thyristor valve whose structure can be simplified while maintaining insulation reliability by efficiently sharing the voltage applied to the coolant piping. .

A feature of the present invention is that cooling liquid piping, which also serves as insulation, is installed along the connection conductors of multiple thyristors connected in series in multiple stages, and the cooling liquid branch to each thyristor module corresponds to the position of the module. Each branch is connected to each module case. As a result, the piping becomes arranged in a meandering manner, which solves the above-mentioned problems of the conventional method, and by uniformly distributing the thyristor main circuit potential to the cooling liquid, high voltage is not locally applied. The result is a liquid-cooled thyristor valve with high insulation reliability even with relatively short piping.

FIG. 1 shows an example of this embodiment. In this example, there are nine thyristor modules 1, three thyristor modules 1 are connected in series in each stage, and three thyristor modules 1 are stacked in three stages, and each stage is connected in series.
That is, between the anode terminal 6 and the cathode terminal 7, 9
The thyristor modules are connected in series by the main circuit connection conductor 8. Inside the thyristor module 1, a thyristor stack 10 and its attached parts 11 are housed. The entire three-tiered thyristor valve is fixed to a frame composed of an upper frame/pressure equalizing plate 4 above the insulating column 2, a lower frame/pressure equalizing plate 3 below, and side pressure equalizing plates 5 on both sides. Coolant pipes 9A and 9B are installed along the main circuit connection conductor 8. 9A is a coolant supply pipe, and 9B is a drain pipe. Each thyristor module takes in the coolant from the coolant pipe 9A,
Coolant pipe 9 so as to discharge to coolant pipe 9B.
A and 9B are connected in parallel.

FIG. 2 shows a detailed diagram of the piping inside the thyristor module 1. As shown, thyristor module 1
Inside are a thyristor stack 10, an anode reactor 11, and other accessories (resistors, etc.) 1.
1B, 11C, capacitors, pulse amplifiers, and gate control parts are housed. In this figure, these parts are housed for two circuits. This module 1
are fixed to the insulating column 2 with a gap depending on the applied voltage. As described above, this insulating column 2 is fixed by the lower frame/pressure equalizing plate 3 and the upper frame/pressure equalizing plate 4. The main circuit is connected from the anode terminal 6A of one of the two circuits to the anode reactor 11 of module 1.
A, connected to the thyristor stack 10, then connected to the stack for one remaining circuit and the anode reactor, and then connected to the next module by the connecting conductor 8. At this time, the potential of the connecting conductor 8 connecting between the thyristor stacks 10 (the intermediate potential of the module) is the same as that of the module 1 and the case 21. Also, anode terminal 6
The A potential is connected to the upper frame and pressure equalization plate, and also to the cathode terminal 7.
The potential is lower frame/equalizing plate and coolant piping 9A, 9B
And they are all the same.

Thyristor stack 10 and anode reactor 11 housed in thyristor module 1
Heat-generating parts of the main circuit of A and accessory parts (resistors)
The means for cooling the heat-generating components 11B and 11C is a liquid cooling type (for example, water cooling type), and the cooling liquid (water) piping 9A and 9B are installed along the main circuit connecting conductor 8 as shown in FIG. Inside each module 1, water is passed from coolant (water) piping 9A, 9B to each cooled object via an insulated hose 24 via a coolant (water) branch 23. Coolant (water) branch 23
is short-circuited to the module case 21 at the connection position 25, so that it is at the intermediate potential of the module 1. Therefore, according to this embodiment, the cooling liquid (water)
The voltage applied to both ends of the pipes 9A and 9B becomes the voltage between the modules 1 (12 thyristor elements), and the potential sharing can be made uniform. Also, the piping is 25
It is connected to the case 21 at the main circuit potential.

As described above, according to the present invention, since the coolant pipe is arranged along the main circuit connection conductor, the length of the pipe can be increased, and therefore the voltage applied to both ends of the coolant pipe is at most between modules. Since high voltage is not applied locally, insulation reliability is improved, and the piping shape is simplified, which has the effect of simplifying the structure of the thyristor valve. be.

[Brief explanation of the drawing]

FIG. 1 is a front view of a liquid-cooled thyristor valve according to the present invention, and FIG. 2 is a plan view (partially sectional view) of the thyristor module in FIG. 1. 1... Thyristor module, 2... Insulating support column, 3... Lower frame and pressure equalizing plate, 4... Upper frame and pressure equalizing plate, 5... Side pressure equalizing plate, 6... Anode terminal, 7
... Cathode terminal, 8 ... Main circuit connection conductor, 9
A, 9B... Coolant piping, 10... Thyristor stack, 11... Accessory parts (resistor), 21...
Case, 23...Cooling liquid branch, 24...Insulating hose, 25...Potential fixed connection (short circuit) position.

Claims (1)

[Claims] 1. In a thyristor valve in which a plurality of thyristors are connected in series and in multiple stages via connecting conductors, and a module consisting of each thyristor and its attached parts is cooled with liquid, a A coolant pipe is laid, a coolant branch part for branching the coolant from the coolant pipe to each module is provided corresponding to the position of each module, and each module case corresponding to each coolant branch part is provided. A liquid-cooled thyristor valve characterized in that a short circuit means is connected to each branch to equalize the potential of the thyristor valve.