JPS60121956A - High voltage thyristor converter - Google Patents

Abstract

PURPOSE:To transmit a signal in noncontacting state with a signal converter provided at the ground potential level in the drive control of a thyristor module by using a laser beam as transmitting means of a gate signal of a thyristor converter. CONSTITUTION:A control signal of a laser beam 3 outputted from a converter 1 which receives an operation command is transmitted through a cable 7 to a laser beam radiator 2. A receiver 4 which receives the laser beam and converts it into an electric signal is associated in a thyristor module SM. The radiator 2 and the converter 1 are disposed at the ground potential level, and used in noncontacting state with the high voltage unit of the module SM. Thus, the reliability and the maintainability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a high voltage silice converter used for DC power transmission and the like.

[Prior art]

FIG. 1 is a wiring diagram of a high-voltage thyristor converter to which the present invention is directed, and shows AC buses R and S.

The alternating current supplied from T is converted into direct current via the bridge-connected pulp U~2, and the DC bus P is also used.

Converts DC supplied from N to AC.

As shown in FIG.
-sn, an attached anno-trictictor AL, and a cyrisk module S consisting of resistors, capacitors, etc.
As shown in FIG. 3, M is stacked using the required number of insulating supports B.

Gate signal transmission methods for the individual thyristor elements constituting the thyristor module SM include a method in which an electrical signal converted by a pulse transformer at the ground potential level is transmitted to a high voltage section, and a method in which an electrical signal is transmitted to a high voltage section as shown in the example in Fig. 3.
m, converter CD converts the operation command into an optical signal at ground potential level pressure, and converts this into a light guide L such as an optical cable.
There are some that use G to transmit high voltage parts.

FIG. 4 is a diagram showing the principle of a gate signal transmission system using an optical cable. CD is a conversion device that converts a thyristor valve operating command into an optical signal, and has a light emitting element EL inside. LG is a light guide for transmitting the optical signal from the light emitting element EL to the Cyrisk module SMK at a high voltage level.

Optical cables are usually used. J and T are connection parts between the Cyrisk module SM and the light guide LG, and are configured to be removable using a cover.

LE is a light receiving element, and a trigger signal that has become an electric signal here drives an electric trigger signal ET.

On the other hand, the electrical circuit components that make up the thyristor module SM have a limited lifespan, and therefore the thyristor module needs to be replaced after a certain number of years. In this case, it is necessary to attach and detach the connecting portion JT of the cable that transmits electrical signals and optical signals to the SIRISK module SM, and the cable LG is damaged during this attaching and detaching work. In particular, optical cables for transmitting optical signals have relatively low flexibility and are prone to breakage during work. 500 again
In the case of UHV-class cyrisk valves used in KV DC power transmission systems, the withstand voltage performance of optical cables is lower than that of epoxy cast products, and measures to improve this were needed.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of the conventional ones, and uses a laser beam as a means of transmitting the gate signal of the thyristor conversion device, thereby converting the thyristor module placed in the high voltage section. The object of the present invention is to provide a SIRISK conversion device that performs drive control and transmits signals in a non-contact state with a signal conversion device provided at the ground potential level, and improves reliability and maintainability.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fifth
The figures are for a detailed explanation of the invention. 1 in the diagram
is a conversion device for converting the operation command of the cyrisk valve into an electric signal that can control the pulsed laser beam signal 3 output from the laser beam emitter 2. As the laser beam emitter 2, a small one with low output is easy to handle, and a short wavelength one in the visible light range such as a helium neon laser or a semiconductor laser is suitable for this (for example, a helium neon laser The wavelength is 6328 angstroms, and the output power ranges from a few watts to more than 10 watts).

Reference numeral 4 denotes a light receiving device, which is incorporated inside the thyristor module SM placed in the high voltage section. As the light receiving element of the light receiving device 4, a photodiode or the like can be used. 5 is a conversion device for converting the electrical output from the light receiving device 4 into a trigger signal for driving the electrical trigger BT.

The laser beam emitter 2 and the converter 1 are kept at the ground potential level and are used without contacting high voltage parts such as the thyristor module 8M.

Note that since helium-neon lasers and semiconductor lasers have short wavelengths in the visible light region, they can respond to input signals with a high frequency of several KH2, and are suitable for transmitting thyristor control signals.

FIG. 6 shows an embodiment of the present invention applied to an air-insulated high-voltage thyristor converter. In the figure,
2 is a laser beam emitter, which is supported by a support column 6.

A control signal for the laser beam 3 outputted from the conversion device 1 in response to the operation command is transmitted to the laser beam emitter 2 via the cable 7. The insulation distance between the thyristor module SM in the high voltage section and the laser beam emitter 2 can be arbitrarily set depending on the rated voltage of the thyristor converter. In this example, the thyrisk module SM can be dismantled without removing the cable carrying the thyristor firing signal.

FIG. 7 shows another embodiment of the invention.

In the figure, 11 is a metal container placed at ground potential to enclose and seal the thyristor module SM, insulating column B, etc. placed inside. It is meant to be isolated and protected.

10 is a branch pipe, which is provided to protrude from the side wall of the container 11;
Its tip is sealed by a mechanical button 9 that can transmit light. Reference numeral 13 denotes a support base that mechanically holds the laser beam emitter 2 while maintaining its relative relationship with the container 11. A laser beam 30 control signal outputted from the converter 1 in response to the operation command is transmitted to the laser beam emitter via the cable 7.

In this embodiment, there is no need to provide a filter sealing device at the part where the signal cable penetrates the container, which was conventionally introduced inside the container 11, and the sealing performance of the container is improved. Since the control system, which is at the ground potential level, such as the container 2, is located outside the container, maintenance and inspection of these components is also facilitated.

In the above embodiments, all Thyrisks are explained as electrically triggered thyristors, but if an optical trigger thyristor, which has recently been put into practical use, is used, the light receiving device 4 and conversion device 5 provided in the Thyrisk module can be omitted. It is also possible to do so.

〔Effect of the invention〕

According to the present invention having the IC configuration as described above, the thyristor module in the high voltage section is not in contact with the signal transmission system at ground potential, so it is difficult to transmit optical or electrical signals during disassembly and inspection of the button or thyristor module. There is no need to remove cables, improving maintainability. Furthermore, compared to the case where an optical cable or the like is used as a transmission cable, this method has the effect of preventing breakage of the cable due to disassembly of the cable connection portion.

Furthermore, since the signal transmission system is non-contact, there is no need to consider the withstand voltage performance of transmission cables, etc., and reliability is improved.

[Brief explanation of drawings]

Fig. 1 is an electrical wiring diagram of a high voltage thyristor converter to which the present invention is applied, Fig. 2 is an internal circuit diagram of a thyristor module, Fig. 3 is a schematic side view of a conventional high voltage thyristor converter, and Fig. 4 is a schematic side view of a conventional high voltage thyristor converter. The figure is a block diagram of the ignition signal transmission section.
FIG. 5 is a block diagram of an ignition signal transmission section of a high voltage thyristor conversion device using a button according to an embodiment of the present invention, and FIGS.
The figures are schematic side views showing other embodiments of the invention. 1... Conversion device, 2... Laser beam emitter, 3°
゛. Laser beam, 4... Light receiving device, 5... Signal conversion device, 7... Transmission cable, 9... Membrane button, 10
... Branch pipe, 11... Container. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Corporation Figure 1 Figure 3 Pencil 5 Figure 6

Claims (1)

[Claims] (1) Pulp made by stacking the required number of thyristor modules consisting of multiple thyristor elements and associated electrical parts, and a converter placed at the ground potential level to supply a gate signal to each thyristor module via a transmission means. A high voltage Zyristor conversion device comprising: a laser beam emitter that emits a laser beam in response to an electrical signal from the conversion device;
A high voltage thyristor conversion device comprising a light receiving device that receives the laser beam and converts it into an electrical signal. (211) The high voltage Zyristor converter device according to claim 1, wherein the laser beam emitter is disposed on the side of the Syrisk module.