JPH0318403B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to substation equipment in which a split three-phase transformer and a switchgear are connected by a gas-insulated bus bar, which are used in ultra-super high voltage power transmission systems such as 500kV and 1000kV. In particular, the present invention relates to substation equipment with improved arrangement and connection configuration of lightning arresters.

[Technical background of the invention and its problems]

In recent years, with the rapid increase in electric power demand, substations are also becoming increasingly high voltage and large capacity.
When it comes to high-voltage, large-capacity substations, the area required for the arrangement of equipment becomes enormous, and it is essential to reduce the substation area by optimizing the arrangement of each piece of equipment. In addition, with the increase in voltage and current capacity, gas-insulated busbars are being used instead of conventional power cables for connections between substation equipment, especially between three-phase transformers and gas-insulated switchgear. It is starting to be used.

FIG. 1 is a plan view showing an example of the arrangement and configuration of equipment for a substation currently being considered. As shown in Fig. 1, three-phase transformers Tr1 and Tr2 are arranged facing each other in correspondence with each line of the two lines, and three single-phase transformers 1 constituting each phase of each line are arranged for each line. arranged in a straight line. A high-voltage side outlet 11 is drawn out from the side surface of the single-phase transformer 1 of each phase of each line, and an intermediate-voltage side outlet 12 is drawn out from the top surface of the single-phase transformer 1 of each phase.

Three-phase transformers Tr1 and Tr2 for each line are arranged facing each other in the high-voltage outlet 11 of each phase. A gas insulated bus bar 2 is connected. In addition, in the medium voltage side outlet part 12 of each phase, as described above, in the space existing between the two lines of the three-phase transformers Tr1 and Tr2 of each line, the direction of extraction is opposite to that of each gas insulated bus bar 2 on the high voltage side. The gas insulated busbars 3 on the intermediate voltage side are connected to each other. The other ends of these gas-insulated busbars 2 and 3 on the high-voltage side and medium-voltage side are connected to a gas-insulated switchgear (not shown) required for protecting the transformer and operating the substation. As shown here, the intermediate voltage side gas insulated bus 3 is generally converted into a three-phase gas insulated bus 4 from a predetermined position. Note that 15 in the figure is a cooler.

In the conventional concept shown in FIG. 1, the high-voltage side lightning arrester 5 is required to be located as close to the single-phase transformer 1 of each phase as possible, so as shown in the figure, the gas-insulated bus bar is directly connected to the high-voltage side outlet 11. It was generally arranged to be connected to the section 13 and therefore arranged in the space between the single-phase transformer 1 and the high-voltage side gas-insulated bus bar 2.

Although not shown here, the intermediate voltage side is also connected to the gas insulated bus section 14 in exactly the same manner.

As described above, the connection arrangement of the lightning arrester has the following drawbacks and problems.

(1) The lightning arrester 5 is connected to the high voltage side and medium voltage side gas insulated bus bar 2.
and 3 and the single-phase transformer 1, so a space is required for that purpose.
Therefore, it is not possible to minimize the distance d between the two lines shown in Figure 1, and it is necessary to minimize the distance X required in the direction orthogonal to each line, which determines the size of the entire substation transformer group. I can't.

(2) Since the lightning arrester 5 is placed in a space where the high-voltage side and intermediate-voltage side gas-insulated bus bars 2 and 3 are intertwined, there is little freedom in the shape and arrangement of the lightning arrester itself, and there are restrictions on the characteristics of protecting the transformer. . In addition, installation and removal of the lightning arrester 5 and various measurements during operation made the work difficult.

[Purpose of the invention]

The present invention has been made in order to eliminate the various drawbacks of the above-mentioned conventional art, and it is possible to minimize the area required for each single-phase transformer group in a substation without reducing the protection purpose of the lightning arrester for the transformer, and to It is an object of the present invention to provide substation equipment having a group of gas-insulated bus-bar directly connected three-phase transformers, which can improve workability in assembly, carrying out, and measurement, and eliminate restrictions on the arrangement.

[Summary of the invention]

In order to achieve such an object, the present invention arranges high-voltage side and intermediate-voltage side surge arresters in the spaces between the single-phase transformers of each phase on the switchgear sides of the high-voltage side and intermediate-voltage side, and arranges the surge arresters on each single-phase transformer. The structure is such that it is connected to a gas insulated bus bar which is arranged horizontally and substantially perpendicular to the drawing direction of the high-voltage side and medium-voltage side outlets of the phase transformer.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of the arrangement and connection configuration of substation equipment according to the present invention, in which three-phase transformers Tr1 and Tr2
are arranged facing each other in correspondence with each of the two lines, and three single-phase transformers 1 constituting each phase of each line are arranged in a straight line for each line. A high-voltage side outlet 11 is drawn out from the side surface of the single-phase transformer 1 of each phase of each line, and an intermediate-voltage side outlet 12 is drawn out from the top surface of the single-phase transformer 1 of each phase. In this case, the outlet positions of the high-voltage side outlet 11 and the medium-voltage side outlet 12 of the single-phase transformer 1 of each phase of each line are symmetrical with respect to each single-phase transformer of both lines. Further, the exit directions of the high-voltage side outlet section 11 and the medium-voltage side outlet section 12 are directed toward the space existing between the single-phase transformers of both lines. Therefore, for each phase of single-phase transformer 1 constituting three-phase transformer Tr1, three-phase transformer Tr2
If the single-phase transformers 1 of each phase making up the circuit are arranged in the same direction, the single-phase transformers 1 of each phase of both circuits, including the high-voltage side outlet 11 and the medium-voltage side outlet 12, As shown in FIG. 2, the configuration is symmetrical.

On the other hand, the high voltage side gas insulated bus 2 constituting each phase connected to the high voltage side outlet 11 drawn out from the single phase transformer 1 of each phase of each line is a three phase transformer Tr1,
The Tr 2 is arranged in the space existing between the two opposing lines, along the arrangement direction of the single-phase transformers 1 of each phase of each line, and so as to overlap in a direction perpendicular to the ground.

In this way, the outlet positions of the high-voltage side outlet part 11 and the medium-voltage side outlet part 12 drawn out from the single-phase transformer 1 of each phase arranged in a straight line corresponding to each line of the two lines are The single-phase transformers of each phase are made to be symmetrical with each other, and their lead-out directions are directed toward the space existing between the two lines.

In such an arrangement, the high voltage side lightning arrester 5
is arranged in a dead space existing on the high voltage switchgear side between the single phase transformers 1 of each phase constituting the single phase transformers Tr1 and Tr2, and is directed in the drawing direction of the high voltage side outlet 11 from each single phase transformer 1. The high-pressure side gas insulated bus bar 2 is arranged horizontally and almost perpendicular to the
It is connected to the. The lightning arrester on the intermediate voltage side has exactly the same configuration as the high voltage side, and its explanation will be omitted here. Note that 15 in the figure is a cooler.

In the gas-insulated substation equipment configured as described above, the following effects can be obtained.

(1) Since the lightning arrester 5 can be placed in the dead space between the single-phase transformers 1 of each phase that make up the three-phase transformer, the space can be used effectively. 5, the loading/unloading, assembly work, and various measurement work become easier.

(2) Since the lightning arrester 5 is not arranged and connected to the gas insulated bus bar section 13 between the high voltage side outlet 11 drawn out from each single phase transformer 1 and the high voltage side gas insulated bus bar 2, that space is not required. Therefore, each single-phase transformer 1 can be brought sufficiently close to the high-voltage side gas insulated bus bar 2. That is, as a result, the distance d between both lines shown in FIG. 2 can be minimized compared to the conventional one, and therefore the distance X required in the direction orthogonal to each line can be minimized. Moreover, even with the above configuration, three-phase transformers Tr1 and Tr2 are connected as shown in FIGS. 1 and 2.
The distance l between the single-phase transformers 1 of each phase composing the
Since the total length Y in the arrangement direction is the same, the area required for the transformer group in the substation can be minimized. Furthermore, minimizing the distance d means that the length of the high-pressure gas insulated bus bar can be minimized, which can also contribute to improving insulation stability.

(3) Since the placement location of the lightning arrester 5 is not restricted as compared to the past, the degree of freedom in placement of the lightning arrester 5 itself is increased, and better lightning arrester characteristics can be obtained in terms of protecting the transformer.

In addition, in such gas-insulated substation equipment, even if the distance between each single-phase transformer and the gas-insulated bus is minimized and a lightning arrester is placed in the space between each phase, the distance between the lightning arrester and the transformer is Since there is almost no increase compared to the conventional one, there is no reduction in the protection characteristics for each single-phase transformer in particular.

In the above embodiment, the symmetrical arrangement of two banks has been described, but of course the arrester can be arranged in the dead space in the case of one bank, two banks in parallel, or four banks in the same manner as described above. In addition, the above-mentioned structure and operation,
The effects are determined by the arrangement of single-phase transformers for each phase, LVR,
Needless to say, this is true regardless of the arrangement of the cooler. Of course, the lightning arrester can be similarly employed in either a vertical or horizontal arrangement.

〔Effect of the invention〕

As explained above, in the present invention, the required area of the transformer group in the substation can be minimized without reducing the protection purpose of the lightning arrester for the transformer, and the workability of assembling, carrying out, and measuring the lightning arrester can be improved. It is possible to remove the constraints on the arrangement,
A substation device having a group of gas-insulated bus-connected three-phase transformers can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the arrangement of substation equipment currently being considered, and FIG. 2 is a plan view showing an example of the arrangement of substation equipment according to the present invention. 1... Single phase transformer, 2... High voltage side gas insulated bus, 3... Medium voltage side gas insulated bus, 4... Medium voltage 3-phase lumped gas insulated bus, 5... High voltage lightning arrester, 11...
...High pressure side outlet, 12...Medium pressure side outlet.

Claims (1)

[Claims] 1 A three-phase transformer is constructed by arranging three or more single-phase transformers in a straight line, and the high-voltage side and medium-voltage side outlets drawn from the single-phase transformer of each phase are connected to each single-phase transformer. High-voltage side and intermediate-voltage side lightning arresters are arranged vertically in multiple stages along the arrangement direction, and both the high-voltage side and the intermediate-voltage side are connected to the switchgear via a gas-insulated bus bar with each phase separated. are placed in the spaces existing on the switchgear sides of the high-voltage side and medium-voltage side between the single-phase transformers of each phase, and those lightning arresters are placed in the spaces existing on the switchgear sides of the high-voltage side and medium-voltage side of each of the single-phase transformers, and those lightning arresters are installed in the spaces existing on the high-voltage side and medium-voltage side outlets of each of the single-phase transformers. Substation equipment characterized by being connected to a gas insulated bus bar that is arranged horizontally and substantially orthogonal to the direction.