JPS58204704A - Ac/dc conversion station - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an AC/DC converter station, and more particularly to an AC/DC converter station with improved equipment arrangement between a conversion transformer and a converter room.

[Technical background of the invention and its problems]

With the recent increase in power demand, the scope of application of DC technology to power systems includes DC power transmission suitable for large-capacity, long-distance power transmission, power interchange between different frequency systems, and stability measures for power systems that have become larger in scale. is being expanded. In particular, electric power systems are becoming more and more powerful, and when transmitting large amounts of power to remote locations,
In the case of direct current, as with alternating current, the transmission voltage is increasing, and AC/DC conversion stations of ±250 kV class have already been constructed. 10
For 100OO class power transmission, UHV class is indispensable in the AC system. UHV class requires a huge amount of site space from the perspective of securing space under the wires of transmission towers. Therefore, even with the same 101,000t), in the case of DC power transmission, ±50C)kV class is enough to cover the power transmission capacity,
kV power transmission will become an advantageous trap.

FIG. 1 shows an example of a typical wiring diagram of this type of AC/DC converter station. 1 in the figure is a converter consisting of a thyristor valve that serves as a rectifier for converting alternating current to direct current.
is a low voltage stage converter, IB is a high voltage stage converter, 2 is a converter transformer, 2A is a low voltage stage converter, and 2B is a high voltage stage converter. 3 and 4 are lightning arresters, 5 and 6 are busbars, and 7 and 8 are grounding devices.

The conventional equipment arrangement between the converter transformer 2 and the converter thyristor valve 1 is shown in FIG. However, since conventional converter stations require air insulation up to ±250 kV class,
If a ±500kV class converter station were designed as an extension of this technology, the site for the converter station would be enormous.

Furthermore, when a DC voltage is applied to an insulator, it becomes charged and impurities in the air are attached to it, which tends to reduce its withstand voltage performance. Because it depends on the leakage distance, it is generally compared to AC voltage.
Requires a long bushing.

Therefore, in the configuration of air insulated equipment as shown in FIG. 2, the number of long bushings described above is required to correspond to the number of component equipment.

On the other hand, in DC power transmission, it is common to use a neutral pole wire (ground pole wire) in addition to the positive and negative pole buses, and this is used as a current return path when unbalanced current flows between the positive and negative poles or when one pole is stopped. used for. The components used in this neutral pole circuit also have the same problems as the positive and negative pole components.

However, in the method shown in FIG. 2r, a large space was required between the conversion transformer 2 and the building 9 housing the converter 1 in order to ensure the air insulation distance.

Furthermore, even when gas-insulated busbars are used, conventional single-phase busbars have been used as shown in Figure 3, resulting in a complicated configuration and a long busbar length, thus requiring a large electrical station space. It was necessary.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to -
However, by combining gas insulated equipment, which has been used in multiple directions in recent years, and electrically connecting the conversion transformer and converter, the overall site area can be further reduced and the configuration The purpose of the present invention is to provide an AC/DC converter station that can be simplified and does not require increasing the mechanical strength of the frame structure or the wall surface of the converter storage building.

[Summary of the invention]

In order to achieve such an object, the present invention gas-insulates the equipment from the secondary side of the conversion transformer to the converter via the earthing switch, lightning arrester, and through-wall bushing, and connects these equipment to the outside of the converter room. The high voltage bus bar connecting to the high voltage stage converter and the low voltage bus bar connecting to the low voltage stage converter are arranged vertically, and each bus bar is placed in a lightning arrester container on the outdoor side of the introduction to the converter room. The surge arrester container on the high voltage bus side is placed on the low voltage bus, and the axes of each surge arrester are aligned and perpendicular to the bus.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. Note that the same members as in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted. 4 is a plan view, and FIG. 5 is a side view of FIG. 4. In the figure, 9 is a converter building (valve building) that houses a converter 1 composed of 9 loops of thyristors that form a rectifier, and a converter transformer is installed on the l side of this converter building (hereinafter simply abbreviated as the building) 9. 2 is placed on the other side, and DC side components (not shown) are placed on the other side.

Inside the building 9, that is, the converter room (pulp room) 9a, there is a converter called a quadruple valve (hereinafter abbreviated as quadruple pulp), which is constructed by stacking a low pressure stage converter IA and a high pressure stage converter IB. ) 1' are arranged for three phases. Note that the quadruple pulp structure has recently been attracting attention from the viewpoint of reducing the cost of the building 9.

The low-pressure stage converter IA of each quadruple pulp 1' is connected to the secondary side of the two low-pressure stage conversion transformers via the low-pressure stage through-wall bushing 10... and the bus bar 5... The high pressure stage converter IB... is the through-wall connection for the high pressure stage...
and is connected to the secondary side of the high voltage stage conversion transformer 2B via the bus bar 6 . Further, as shown in FIG. 5, the high-pressure stage wall-through-the-wall bushing 11 and the low-pressure stage through-wall bushing 10 are arranged vertically, and the generatrix lines 6 and 5 are also arranged in a vertical relationship. In addition, the mother #i for the low pressure stage! 5 transformer 21u+
i extends to the high voltage stage conversion transformer 2B and the above transformer 2B
, , 9A and support columns 12 in the middle.

In addition, before the through-wall bushing 10.11 penetrates the building 9 (on the outside surface side of the building), a lightning arrester 4.3 is arranged coaxially in a vertical relationship. and the lightning arrester 4 is connected to the bus bar 6.
It is configured to support.

By arranging the equipment that electrically connects the conversion transformer 2 and the converter l in this way, the weight of the through-wall bushing 10.11 is reduced between the wall surface of the transformer chamber 9a and the lightning arrester 3.
, 4, and can be firmly supported. By sharing the full support with each other in this manner, the burden on the wall surface of the building 9 is reduced, and an inexpensive building configuration is possible. □ In the above-mentioned embodiment, the conversion transformers 2A, 2
I explained that the primary side of B is connected in air,
The present invention is not limited to this, for example, FIGS. 6 and 7,
It may be configured as shown in FIG. 8 or further as shown in FIG.

That is, as shown in FIGS. 6 and 7, a transformer compatible with quadruple pulp 1', that is, a special three-phase transformer 2'
The windings constituting the high-pressure stage and the low-pressure stage are constructed by using a By employing el, it may be possible to further simplify the arrangement.

That is, as shown in FIGS. 4 and 5, when 2B is connected in the air on the primary side of the conversion transformer 2, they must be separated by a predetermined distance to ensure the air insulation distance. This is not the case, and the secondary side bus bar 5 becomes longer during that time. In addition, if the through-wall bushings 10 and 11 that penetrate the building 9 are introduced from the respective openings for each of the three phases, six openings in the building are required at different heights, as shown in FIG.

If the three-phase busbars 5/ and 6/ are introduced into the building and single-phase branched, there will only be two locations, one above and one above, and the introduction section can be easily shut off from rain.

In addition, it goes without saying that the present invention is not limited to the above-described embodiments, and can be implemented in various modifications without departing from the gist of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, the site area of the entire AC/DC converter station can be further reduced, the configuration can be simplified, and the mechanical strength of the frames and walls of the converter storage building can be further reduced. There is no need to increase the size and it is extremely advantageous in terms of cost.

[Brief explanation of drawings]

Fig. 1 is a single line diagram of a typical AC/DC conversion station, Fig. 2 is a plan view showing a conventional example of the specific equipment arrangement shown in Fig. 1, and Fig. 3 is a plan view showing a different conventional example. Fig. 4 is a plan view showing one embodiment of the present invention, Fig. 5 is a side view of the same embodiment, and Fig. 6 is the present invention 1... converter (thyristor valve), IA
...Low three-stage converter, IB...High-pressure stage converter, 2...
Conversion transformer, 2 people...Low voltage stage conversion transformer, 2B.
...High voltage stage conversion transformer, 3... Lightning arrester (low voltage side),
4 Lightning arrester (high pressure side), 5... Mother thigh (low pressure side), 6...
Mother # (high pressure -11), 7...Grounding device (low pressure side), 8
...#Tail device (high pressure side), 9...Building, 9a...
Converter chamber (valve display), 1'...quadruple valve, 10.
・・Through-wall bushing for low pressure stage, 11 ・・Device gear for low pressure membrane 7, ° 12 ・・Support column, 2′ ・・Special 3-phase transformer, 13 ・・Soundproof building, 5 '... 3-phase - finger-shaped bus, 6'... 3-phase - finger-shaped bus. Applicant's Representative Patent Attorney Takehiko Suzue No. 11I No. 21i Fig. 5q Fig. 6 Fig. 7- Fig. 8

Claims (3)

[Claims] (1) From the secondary side of the conversion transformer, a grounding switch, lightning arrester,
The equipment leading to the converter is gas-insulated via through-wall bushings, and these equipments are installed outside the converter room, and the high-voltage bus that connects to the high-pressure stage converter and the low-voltage bus that connects to the low-pressure stage converter are all upper and lower. each busbar is supported by a surge arrester container on the outdoor side of the introduction to the converter room, and the surge arrester container on the high voltage bus side is placed on the low voltage bus, so that the rs of each surge arrester is An AC/DC converter station 0 characterized in that (2) A 3-phase wired bus is used as the gas-insulated bus, a single-phase branch is made on the outdoor side of the introduction to the syrisk bubble room, a lightning arrester is installed at the branch, and the lightning arrester container is used to reduce the weight of the lead-out bushing. 2. The AC/DC converter station according to claim 1, wherein a high-voltage bus surge arrester and a low-voltage bus surge arrester are disposed on the same axis so as to partially support the surge arrester. (3) The AC/DC converter station according to claim 2, characterized in that the single-phase branch from the three-phase bus is carried out inside the thyristor valve chamber, and the bushings are led out radially in the horizontal direction.