JPS582053A - Water-cooled thyristor bulb - Google Patents

Abstract

PURPOSE:To increase the mechanical strength and the dielectric strength of the titled bulb by a method wherein the middle part of a spiral-shaped insuated pipe, which is used as a cooling water pipe, is fixed by the metal supporting members which were fixed to supporting insulators through the intermediary of a buffer layer. CONSTITUTION:The supporting insulators 8, whereon the body of the thyristor bulb will be supportedly bridged on an earthing base 7, is divided into a plurality of parts in conformity with the pitch of the spiral-shaped insulated pipe 6 to be used for cooling water. One end of arm-shaped metal supporting members 9 is fixed between the divided supporting insulators 8. The supporting members 9 are divided into the left and right parts, the insulated pipe 6 is tightened and fixed at the point of the supporting members by a bolt 11 through the buffer layer 10 such as silicon rubber and the like. As a result, the insulted pipe 6 is supported by the supporting insulators 8, and the potential distribution is made uniform. Also, the vibration of the pipe 6 due to impact load can be absorbed by a buffer layer 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-cooled thyristor pulp, and particularly to a support device for a cooling water pipe thereof.

In recent years, thyristor valves (
thyristor converters) have come into use. The thyristor valve is an AC/DC membrane device whose main system is a thyristor, which is a silicon-controlled rectifier, and water cooling is used to cool the many thyristors used there.

The general structure of this water-cooled thyristor pulp is shown in Fig. 1. A water-cooled thyristor pulp is made by connecting a plurality of thyristor elements 1 in series, which is one of the semiconductor elements having a power conversion function. This is housed in a box called a module 2, and the modules 2 are stacked in multiple stages to perform high voltage AC/DC g conversion.Thyristor elements 1 (not shown) are installed since semiconductor elements are sensitive to heat. The fins, anode reactor, etc. of the module are cooled with pure water.The modules 2, which are stacked in multiple stages, are supported by insulating columns 3, and the upper and lower parts of the modules 2 are The upper part 1[4 and the lower electrode 5 are installed. Cooling water is supplied through an insulated vibro arranged in a meandering manner, and if the right side in Fig. 1 is the outgoing route, the left side is the return route. Here, the lower electrode 5 is Since the thyristor pulp body is placed in the ground position, it is necessary to insulate the ground frame 7 that supports the thyristor pulp body.

For this reason, a material with excellent insulation properties such as tetrafluoroethylene resin is generally used for the insulating vibro.

In addition, the shape of the insulated vibro is such that the cooling water inside the vibro is
It is formed in a spiral shape as a method of increasing the distance between the electrodes in order to reduce the leakage 1ita associated with the 1L rate.

In other words, the length of the insulating vibro is increased and the effective height is reduced. Another way to reduce leakage radio waves is to install a filter in the cooling water system to direct the cooling water.
There is a way to minimize the filtering rate, but it is not economical because it requires a huge amount of space and shape for levers, filters, etc.

In these configurations, when water is flowing through the insulated vibro, the weight of the entire cooling vibro increases due to the addition of one drop of the cooling water in the insulated vibro, and it becomes a national problem for the insulated vibro to maintain its original shape and stand on its own. In addition, the thickness of the insulated vibro is increased to I.
F! ! Even if the mechanical strength is increased to make it possible to stand on its own, there is a risk that cracks may occur at the connection to the circulation pipe that supplies cooling water to the thyristor valve. This is because the supporting points of the insulating pipe are two points, one near the lower electrode 5 and the other near the grounding frame 1, so mechanical stress is concentrated at the former connection near the lower electrode 6. . If a crack occurs in the connection part of the insulated vibro, cooling water will leak through this area, reducing the weight of the cooling water. In other words, the cooling ability of the object to be cooled in the thyristor valve is reduced, and one fathom of thyristor sweets is heated, causing failures such as breakage of the thyristor. In addition, as mentioned above, the insulating vibro is made of an insulating material with high insulation resistance such as tetrafluoroethylene resin, so the surface resistance tends to become unbalanced depending on the convenience of the MS environment, and the insulating vibro The potential distribution differs in the length direction. Therefore, discharge may occur on the surface of the insulated pipe C, and the wall surface of the insulated vibrator may be penetrated in order to save on discharge 111. Similarly, water leakage of cooling water may occur from the penetration part. This may cause a malfunction.

The present invention eliminates the above deficiencies and provides a support device at each intermediate portion of a spiral insulated pipe, thereby identifying the insulating pipe and at the same time uniformizing the potential phase separation in the length direction, thereby increasing @Sakaki-like strength and insulation. The purpose of the present invention is to provide a water-cooled thyristor valve having a cooling water pipe with high proof strength and excellent cooling capacity.

An embodiment of the v-no-shitagi invention will be described with reference to the drawings. FIG. 2 shows an embodiment according to the present invention, in which a support insulator 8 for supporting and mounting a thyristor valve body on a grounding frame 1 is divided into a plurality of pieces in accordance with the pitch of the insulating vibro. When these divided support insulators 8 are stacked in series, the dimensions and longitudinal direction are adjusted so that they have sufficient dielectric strength against the rated magnetic pressure of the thyristor valve. Here, one end of an arm-shaped support member 9 made of metal is fixed between each of the divided support insulators 8-8.
The other end is fixed to an insulated vibro. Fig. 3 shows an example of a method of fixing the support member 9 and the insulating vibro.The support member 9 is divided into two parts, left and right. The insulating vibro is tightened and fixed by bolts 11 through the stress layer 10.

! ! The stress layer 10 can be inserted in advance before attaching the insulating vibro to the thyristorium tube body, or it can be divided into two parts, etc. Can be attached.

Here, the support member 9 may have a thickness and width that can mechanically support the insulating pipe e.
0 is formed to have approximately the same width as the support member 9.

Although these structures have been described for the insulating vibro on the left side in FIG. 1, the right side is similarly fixed to the support insulator 8 by a boat member 9 via a buffer layer 10.

In these configurations, the spirally formed insulating vibro has increased mechanical strength even when the weight of the cooling water is added to it when the cooling water is flowing, and even when the vibration is applied when the water is being fed. Because of this, it can stand on its own without changing its shape. Since the support points are dispersed in several places, the support member 9 provides mechanical support for the mechanical stress applied to the connection with the circulation pipe that supplies water to each $5 liter of thyristor pulp. This reduces mechanical stress.

No more cracks in the connection parts. In addition, with respect to the equilibrium load at the time of emergency stop of the cooling water, the shaking of the P-edge pulp 6 can be recovered by the @shank layer 10.

Insulation resistance of insulation vibro (101~16Ωtゝ)
On the other hand, since the insulation resistance of the support hook is generally one to two orders of magnitude lower, the potential is shared between the metal tube support member 9 and the support insulator 8 connected to the insulating vibro. Therefore, the insulating vibro has a uniform potential distribution in the length direction, and its dielectric strength is improved. Therefore, an unbalance of surface resistance occurred due to changes in ambient environmental conditions.
4L"+8 ・In case W, this occurs in both the insulating vibro and the support insulator 8, but the potential is shared by the support insulator with low insulation resistance"
No surface discharge occurs in the 1-foot insulation puff pro, and the dielectric strength can be further improved.

Since the supporting insulator 8 is made of inorganic magnetic material, there is no discharge deterioration due to electrical discharge, etc.) Once the unbalance of surface resistance is eliminated, the supporting insulator 8 returns to its normal state.

Here, the buffer ji#10 has been described using an insulating material such as silicone rubber, but the same effect can be obtained by using a conductive material such as rubber mixed with carbon powder.

As described above, according to the present invention, each intermediate portion of the spiral insulated pipe, which is a cooling water pipe, is identified with a metal support member through a buffer layer such as rubber, and this is fixed by brazing in the longitudinal direction. It is possible to obtain a water-cooled thyristor valve equipped with a cooling water pipe having particularly high mechanical strength and dielectric strength and excellent cooling capacity.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing a configuration example of a water-cooled thyristor pulp, FIG. 2 is an enlarged front view showing a cooling water pipe support structure according to an embodiment of the present invention, and FIG. 3 is a diagram according to an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing a support structure of the intermediate portion of the cooling water pipe. l... Thyristor element, 2... Module, 3...
・Insulating support column, 4.5... Upper and lower electrodes, 6.
...Insulating pipe, 7...Grounding frame, 8...Support insulator, 9...Support member, 10...AM layer, 11...
·bolt. Only one representative, patent attorney Suzue Takehiko, 1st I! 1

Claims (1)

[Claims] In a water-cooled thyristor pulp, in which a thyristor pulp main body is supported and mounted on a grounding frame by a supporting insulator, and a spiral insulated pipe for cooling water is provided between the grounding frame and the thyristor pulp body, the insulating pipe is slowly collapsed. A water-cooled thyristor pulp, characterized in that it is fixed to a supporting insulator with a metal support member.