KR20070096926A - Gas insulation switchgear - Google Patents

Abstract

A gas insulation switchgear is provided to reduce an overall height and length of the GIS by laminating mother line groups in multiple stages in the GIS(Gas Insulated Switchgear). A gas insulation switchgear includes a single phase device having intra-line connection mother lines(2A,2B), an elongation mother line(4), vertical circuit breakers(1A-1F), and inter-line connection mother lines. The intra-line connection mother lines, the elongation mother line, and the inter-line connection mother lines are arranged to be parallel to each other on a same plane. The intra-line connection mother lines and the inter-line connection mother lines are arranged to be overlapped with each other on the same plane. The elongation mother line is arranged to be overlapped with the intra-line connection mother lines and the inter-line connection mother lines in a vertical direction. The vertical circuit breakers are arranged at a side portion of the intra-line connection mother lines and the inter-line connection mother lines in an alignment direction, such that the alignment direction is parallel to a main axis of the intra-line connection mother lines and the inter-line connection mother lines.

Description

Gas Insulated Switchgear {GAS INSULATION SWITCHGEAR}

1 is a plan view showing one embodiment of a gas insulated switchgear according to the present invention;

Figure 2 is a front view of the gas insulated switchgear of Figure 1;

3 is a side view of a vertical breaker portion of the gas insulated switchgear of FIG.

4 is a disconnected wiring diagram of the gas insulated switchgear of FIG. 1;

5 is a plan view showing one example of a conventional gas insulated switchgear.

<Explanation of symbols for main parts of the drawings>

1: circuit breaker

1A: first breaker of the first line

1B: second breaker of the first line

1C: third circuit breaker of the first line

1D: first breaker of the second line

1E: second breaker on second line

1F: 3rd breaker of 2nd line

2A, 2B: In-line connection bus

3A, 3B: Main bus connection between lines

4: withdrawal bus

5: disconnector

6: first line

7: second line

8: lateral vibration busbar of the drawing busbar

9A: upper inlet of breaker

9B: lower inlet of breaker

10: lifting insulation bushing

15: connecting busbar

40: vertical busbar of the drawing busbar

[Document 1] Japanese Patent Application Laid-open No. 58-006013

The present invention is a bus wiring system of an electric circuit constituting an electric station such as a substation, and has a gas insulated switchgear having a layout configuration called a 1 1/2 circuit breaker system in which three circuit breakers are connected in series between main bus lines. It is about.

Generally, in an electric station to which a gas insulated switchgear (hereinafter abbreviated as GIS) is applied, when the layout configuration of the 1 1/2 circuit breaker is performed, as shown in FIG. 5, a plurality of lines (for convenience of explanation in this example, The number of circuits was set to two lines of the circuits 6 and 7] by connecting the main bus lines 3A and 3B between the lines, and each of the vertical circuit breakers 1A to 3 to each of the lines 6 and 7. 1C and 1D to 1F are electrically connected in series with the in-line connection buses 2A and 2B via disconnectors 5 arranged on both sides of each breaker. By adopting this 1 1/2 breaker system, even in a single bus stop accident or breaker inspection, operation that does not require stopping of the system connected to the take-out bus 4 can be performed.

In the arrangement of the line 6, for example, the circuit 6 includes three circuit breakers 1A to 1C, a disconnecting device 5, and in-line connecting buses 2A and 2B on the same axis. In addition, the main line connection main buses 3A and 3B are connected orthogonally to the one-line configuration axis, and the respective lines are arranged in parallel.

In the circuit arranged in this way, in order to prevent the maintenance and repair work of a vertical circuit breaker, the upper space of the circuit breakers 1A-1C or 1D-1F requires a check space, such as an pulling operation. For this reason, the lateral vibration busbar 8 for lateral vibration in the line direction is attached to the lead busbar 4.

In addition, in FIG. 5, for simplicity, only the circuit breaker, disconnector, and busbar which are necessary for description are shown among the GIS components, and the ground switch, the instrument transformer, the instrument current transformer, the lightning arrester, etc. are abbreviate | omitted from description.

In the case of applying the GIS layout of the 1 1/2 breaker system as described above, three breakers 1A to 1C in the line 6, disconnectors 5 on both sides of each breaker and in-line connection buses 2A, Since each of the constituent devices, such as 2B), is arranged on the same axis, the line dimensions (depth dimensions) are such that the dimensions of each device are added together. In addition, since the lines 6 and 7 are arranged in parallel with each other, the width dimension between the lines is increased, including the influence of the lateral vibration bus bar 8, thereby increasing the space required for installation. In the case of indoor GIS, a building with both the same depth and width as the gymnasium was needed.

By increasing the dimensions between the lines 6 and 7, the inter-connection main buses 3A and 3B and the outgoing buses 4 by increasing the depth dimensions of the lines 6 and 7, respectively, are redundant. Originally, many constituent busbars were required, including unnecessary lateral vibration busbars 8.

As described above, in the conventional layout, a large space must be secured for the installation of the GIS, and improvement has been strongly demanded from both the installation location and economical efficiency.

In addition, when the breaker needs to be removed from the line at the time of repair or repair of the breaker, the breaker is inserted by the disconnecting device 5 from both sides, and thus cannot be taken out directly. For this reason, the adjacent apparatus had to be taken out after disassembling, and the work efficiency for inspection and repair was bad.

As an example of these improvement measures, Document 1 discloses a gas insulated switchgear of a 1 1/2 circuit breaker system, in which a main main line and an in-line connection main bus are connected to a three-phase bus, and parallel to the main bus. By arranging breakers independently, the technique which aimed at reducing the installation area and improving the inspection property is described. However, the technique described in Document 1 had the following problem to be solved, and was not excellent in practicality.

The substation bus connection system includes a single bus system, a double bus system, a 1 1/2 circuit breaker system, and the economical comparison in the unit of a line is the highest with a 1 1/2 circuit breaker system. This is because three breakers, which are the most expensive among the components, are used for drawing out two systems. For this reason, a 1 1/2 breaker substation is mainly used as a configuration of a substation having a high importance, that is, a high voltage and a large capacity substation, in view of construction cost.

On the other hand, the feature seen from the tank structure of the bus bar which comprises GIS tends to comprise three phases by juxtaposing three single phase apparatuses from a three-phase collective apparatus structure as it goes from low voltage to high voltage. In general, the three-phase collective configuration has been adopted for the reduction of the GIS and economical efficiency. However, by storing the three-phase single-phase equipment in the same tank, the electric field stress is increased, the tank size increases with the high voltage, and the insulation support is enlarged. Technical difficulties are exerted, such as the tendency to reduce the advantages and advantages of the single phase.

In addition, in the event of an accident, since the influence range extends to all three phases, recovery time and recovery cost increase, and the demand for single phase is strong in an important substation where long power failure is not allowed. In other words, a single phase is generally employed in high voltage and large capacity substations. Incidentally, in the GIS with a voltage of 145 kV class or less, three phases are mainstream, but most of them have a single phase configuration in contrast to 420 kV or more.

In such a high-voltage, high-capacity substation, although the construction cost is expensive, the 1 1/2 circuit breaker system is employed, and the GIS used therein is often composed of a single phase for the reasons described above.

Based on this technical background, the three circuit breakers described in Document 1 are juxtaposed linearly as the vertical type, and each main busbar is supported on the laying surface substantially parallel to the straight line, and the circuit breakers are electrically connected between the circuit breakers. In a gas insulated switchgear in which the connecting busbar is juxtaposed in a relationship above and below the three-phase main busbar, assuming that the main busbar is composed of a single-phase busbar, three busbars are arranged vertically or horizontally. The arrangement of the three busbars is either one or a combination of both.

However, in the case where three main busbars are arranged in the vertical direction, the width dimension thereof does not increase, but in practice, the busbars coming down from the inlet of the vertical circuit breaker cannot connect with the two-phase and three-phase busbars. For this reason, it becomes the structure which arrange | positions three main busbars horizontally, but in order to connect with three vertical busbars which descend | fall from the upper and lower inlet part of a vertical type | mold breaker, since a total of six single-phase main busbars are arranged horizontally in total, The width dimension greatly increases.

This also applies to the connection busbar, and since the connection busbar from the inlet of the vertical circuit breaker is horizontal, the connection busbar of the single phase is inevitably arranged vertically for the reason of avoiding the same interference as described above. This greatly extends in the height direction. This is not suitable for the reduction effect that this proposal is trying to solve.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the problems of the prior art as described above, and an object thereof is to provide an efficient device by arranging a vertical circuit breaker facing the main bus line between lines and arranging each line on the same axis. In order to reduce the area of the site and shorten the length of the bus bar, it is possible to obtain a gas insulated switchgear which can improve the repair and repair efficiency of the circuit breaker.

In order to achieve the above object, the gas insulated switchgear according to the present invention includes first and second lines connected through a main bus line between the first and second lines, and each of the first and second lines First, second and third circuit breakers are electrically connected in series via connection buses in the first and second lines, and one end of the first and third circuit breakers is connected to the first main line between the first and second lines. In the gas insulated switchgear of the 1 1/2 circuit breaker system which is connected, respectively, and withdrawal buses are drawn out between the said 1st and 2nd connection lines in a bus, and connected to a power transmission line, a transformer, etc.,

The apparatus and bus bar which comprise the said gas insulated switchgear are comprised by a single phase apparatus and a single phase bus, respectively,

Three sets of single-phase buses of the first and second line-connected main buses and the first and second line-connected buses are arranged in three phases each horizontally to form a bus group.

These bus groups consist of a laminated arrangement having a common vertical axis, and the one main line connecting main bus of the first and second inter line connecting main buses is the uppermost layer, and the other main line connecting main bus is the lowest layer. In the meantime, the first and second in-line connection buses are arranged in two layers, and the bus group is arranged in the same direction as the main axis of any bus and arranged in a positional relationship that overlaps substantially in a plane.

The first to third circuit breakers of each of the first and second lines are constituted by vertical circuit breakers having upper and lower inlets, and these vertical circuit breakers are close to the side of the mother bus group, and the arrangement direction thereof is the mother bus group. Arranged to be parallel to the main axis to be made, and connected to the corresponding bus bar of the bus bar group, respectively.

And the drawing bus bar is derived in a direction intersecting with the direction of the main axis made by the bus group.

In the gas insulated switchgear according to the present invention having the above-described configuration, the main buses of the first and second lines and the main buses of the first and second lines (these four sets of bus bars are referred to as busbar groups) Each busbar and each circuit breaker are configured as a single-phase device, and 3 units are arranged in parallel to form a three-phase circuit, and the first to third circuit breakers of the circuits are vertical circuit breakers, whereby each bus bar can be stacked.

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described concretely according to FIG. That is, FIG. 1 is a plan view of the present embodiment, FIG. 2 is a front view showing a part of a circuit breaker and a main circuit connecting main bus, and FIG. 3 is a side view showing the relationship between the vertical breaker portion and the main bus. Is disconnection diagram. In addition, the same code | symbol is attached | subjected and demonstrated about the member same as the conventional gas insulated switchgear shown in FIG.

(1) Configuration of Example

As shown in Fig. 1, the first and second lines 6 and 7 constitute three phases by three single-phase bus bars arranged in parallel with each other, and are substantially equal to each other in the line connection buses 2A and 2B. Three circuit breakers 1A, 1B, 1C, and 1D, 1E, and 1F arranged in series are connected in series. In addition, as shown in Figs. 2 and 3, in the line 6, the in-line connection bus 2A includes the upper inlet portion 9A of the vertical circuit breakers 1A and 1B, the connection bus 15 and the disconnector ( It is located under this connecting bus 15 via 5), and is connected so that it may orthogonally cross. In addition, the in-line connection bus 2B is located below and connected to the lower inlet 9B of the vertical circuit breakers 1B and 1C via the connection bus 15 and the disconnector 5. It is connected to orthogonally to the bus bar 15.

On the other hand, in the case of the line 7, the in-line connection bus 2A is connected to the lower main inlet 9A of the vertical circuit breakers 1D and 1E by the connection bus 15 and the disconnector 5. It is located below, and is connected so that it may orthogonally cross the connecting bus bar 15. In addition, the in-line connecting bus 2B is located below the connecting bus 15 through the upper inlet 9B of the vertical circuit breakers 1E and 1F, and through the connecting bus 15 and the disconnector 5, and is also connected to the connecting bus. It is connected to orthogonal to (15).

In addition, although it is also possible to make arrangement | positioning connection of the in-line connection bus 2A, 2B of the line 7 equivalent to the line 6, here, it is an example from the equalization of the electric current (algae) which flows between the lines 6, 7. For example, in line 6, it is a transmission line from between breakers 1A and 1B, it is a transformer from between breakers 1B and 1C, while in line 7, it is a transmission line from between breakers 1D and 1E, and a breaker. In the disconnection wiring diagram shown in Fig. 4 by the transformer between 1E and 1F, it is possible to pull out the attachment part. In addition, it is possible to draw out the capping portion in the same bus line and the same device unit state of the line 6, and it is an embodiment with high operability and expandability.

In-line connection buses 2A, 2B of the first line 6 and in-line connection buses 2A, 2B of the second line 7 are arranged on the same axis in a plane. In addition, the in-line connection buses 2A and 2B have a stacked arrangement having a common vertical axis as shown in Fig. 3, and the spacing is between the upper inlet 9A and the lower inlet 9B of the vertical circuit breaker. It is almost equal to pitch.

The interline connection main buses 3A and 3B connecting the first and second lines 6 and 7 are constituted in three phases by three single phase buses arranged in parallel with each other. As shown in Fig. 2 and Fig. 3, the main line connection main bus 3A is connected through the upper inlet portion 9A of the breakers 1C and 1D and the disconnecting device 5, and at the same time, the in-line connection main bus ( It is arranged above 2A).

The interline connection main bus 3B is connected via the lower inlet part 9B of the breaker 1A, 1F, and the disconnecting device 5, and is arrange | positioned under the inline connection bus 2B. The interline connection main buses 3A and 3B have a stacked arrangement in parallel with the intraline connection buses 2A and 2B and in common with the vertical axis. In addition, in the top view of FIG. 1, the in-line connection buses 2A and 2B are shown, and the inter-connection connection main buses 3A and 3B are not shown from the ease of bus discrimination.

Branch lines 2A and 2B connected in the line are provided with branch pipes having an opening upward, and are approximately equal to the height of the upper inlet portion 9A of the breaker 1 through a vertical bus line 40 connected to the branch pipes. The three-phase outgoing bus 4 which consists of three single-phase buses is pulled out from the line orthogonal to the in-line connection buses 2A and 2B.

In general, the drawer bus 4 is connected to a disconnecting device, a grounding switch, a transformer for the instrument, a bushing, and the like, and leads to a system.

First to third vertical circuit breakers 1A to 1C and 1D to 1F are electrically connected to the first and second lines 6 and 7, respectively. These vertical circuit breakers 1A to 1C and 1D to 1F are constituted in three phases by juxtaposing three single-phase circuit breakers as shown in Figs. 1 to 3, and the inlets 9A and 9B of the circuit breakers of each phase. The direction of is opposite to the main line connection main buses 3A and 3B and the in-line connection buses 2A and 2B (hereinafter referred to as the mother bus group), and on the side of the bus group, the arrangement direction is made by the main bus group. To be parallel to

Further, the lead bus 4 is branched from the in-line connecting buses 2A, 2B, respectively, and is located in the reverse direction with the adjacent breaker 1 via the vertical bus 40, and also at the upper inlet position of the vertical breaker, or It is drawn out in the horizontal direction from approximately the same height as the upper connection bus bar 15. Thereby, the lead bus 4 can be taken out without changing the height of the main bus 3A for inter-line connection, and 2 A of in-line connection buses.

Here, with respect to the drawing bus bar 4 connected to a power transmission line, the air insulation bushing 10 is arrange | positioned at each upper edge part, respectively. In this case, the axis line which connects the bushing shaft of each of three phases which are phase arrangement (commonly called A phase, B phase, and C phase) of an air bushing is arrange | positioned so that it may become parallel with the main axis of a bus bar group.

(2) Action of embodiment

As described above, in the present embodiment, vertical breakers (1A to 1C, 1D to 1F) on the outer side of the bus group consisting of the main line connection buses 3A and 3B and the in-line connection buses 2A and 2B. It is possible to take out the circuit breaker 1 independently without disassembling other equipment, and to significantly reduce the working range for the inspection and repair range, and to reduce the work time and cost required for maintenance. It becomes possible.

In addition, by arranging the breaker rows parallel to the bus group outside the bus group of each line 6 and 7, the depth dimension of each GIS line can be configured to the width of three single-phase buses plus one breaker. have. Compared with the conventional example and the configuration shown in Fig. 5, the depth dimension thereof is about one third or less, and a significant reduction is possible. For this reason, site acquisition cost and GIS building construction cost can be reduced, and the lead-out bus 4 can be shortened by decreasing the depth dimension of each line, and the cost can be reduced.

Moreover, it is not necessary to arrange the take-out bus bar 4 to avoid the upper part of the breaker as in the prior art, and the installation space can be reduced. In addition, the lateral vibration busbar 8 for deriving the pullout busbar 4 is also unnecessary, which also contributes to the reduction of the pullout busbar constituting unit.

In this embodiment, the whole apparatus is comprised by the single-phase apparatus, In-line connection buses 2A and 2B and the interline connection main buses 3A and 3B are arranged in four steps in the vertical direction, and are arranged at the bottom and the top. Interline connection main buses 3A and 3B are arranged, and interline connection buses 2A and 2B are arranged in two stages between the main bus lines. In addition, the in-line connection buses 2A and 2B connect the three-phase axes which each makes to the horizontal connection busbars which connected the upper and lower inlets 9A and 9B of the vertical circuit breakers 1A to 1C and 1D to 1F. It moves more than the axis line and busbar diameter of 15), and is orthogonal. Moreover, the disconnecting device 5 is arrange | positioned between the moved space | intervals.

In addition, since the height of the drawing bus bar 4 is arrange | positioned on the same horizontal plane as the connection bus bar 15, it is three-dimensional, without changing the height positions of the main line connection buses 3A, 3B and in-line connection buses 2A, 2B. Can cross. In addition, since the disconnecting device 5 is arranged using the step size of the three-dimensional intersection, the utilization rate of the space is improved and the GIS can be reduced.

In addition, each of the three vertical circuit breakers, 1A to 1C, and 1D to 1F is set to the same pitch, and the upper and lower intervals of the in-line connecting buses 2A and 2B are aligned with the upper and lower inlet pitches of the vertical circuit breakers. In addition, the unit formed by providing the in-line connection buses 2A and 2B and the disconnecting device 5 on both sides can be useful for any line, and can provide a highly versatile and economical GIS.

In addition, both busbar shafts of the horizontal connection bus bar 15 connected to the upper and lower inlets 9A, 9B of the vertical circuit breakers 1A to 1C and 1D to 1F, and the in-line connection buses 2A and 2B. In the vicinity of this intersection, one opening is arranged on the connection bus bar 15 side, and the other is connected to each other in series and electrically connected to each other. have. For this reason, in the connection from the horizontal connection bus bar 15 connected to the vertical circuit breaker to the in-line connection buses 2A and 2B, a stepped connection (bent) bus bar for the purpose of three-dimensional intersection is unnecessary, and the bus unit The quantity of water can be reduced. In addition, each of the horizontal connection buses 15 and the in-line connection buses 2A and 2B can be constituted by a straight bus, so that the production of the bus can be facilitated and the cost can be reduced. In addition, although the grounding apparatus is generally attached to the disconnector 5 here, since it is not the essence of this invention as mentioned above, it is represented by the disconnector 5.

By configuring in this way, it is possible to intersect all bus | wires three-dimensionally, Furthermore, the depth dimension and height dimension of the whole apparatus can be minimized.

That is, the depth dimension can consist of three single-phase buses + the width | variety of a circuit breaker. On the other hand, in the structure described in Document 1, although it is two three-phase bus | bars + breaker width | variety, since a three-phase bus bar is generally 1.5 to 2 times in diameter ratio compared with a single-phase bus, substantially the apparatus of this embodiment is described in Document 1 Even if it compares with the apparatus of description, it is the following.

In addition, in an ultra-high voltage substation, one side is composed of a transformer group and one side of a power transmission line with a GIS column interposed therebetween. In consideration of this point, the air insulation bushing 10 is arranged on the transmission line side, and the lead bus 4 is also arranged on the opposite side so as to be connected to a transformer or the like. In this case, when the takeout bus 4 passes through the breaker, the breaker's checkability is lost, and therefore the breaker is disposed on the opposite side of the takeout bus 4. Therefore, a highly expandable and compact gas insulated switchgear can be realized.

According to the present invention, by stacking the bus group, the depth dimension and the height dimension of the entire apparatus can be reduced. In addition, since single-phase devices are used for bus groups and circuit breakers, the site area can be reduced while ensuring the advantages of being suitable for high voltage and large capacity, compared to gas insulated switchgears constructed using three-phase packaged devices. It is possible to shorten the busbar length and to increase the repair and repair efficiency of the circuit breaker.

Claims (7)

1st, 2nd line | wire connection The 1st, 2nd line | wire is provided with the 1st, 2nd line connected through the main bus | line, and each of these 1st, 2nd line | wires has a 1st, 2nd circuit breaker Electrically connected in series via an in-line connection bus, wherein one end of the first and third breakers is connected to the first and second inter-connection main buses respectively, and the first and second in-line connection buses In the gas insulated switchgear of the 1 1/2 circuit breaker system which drawer bus bar is drawn out and connected to a power transmission line, a transformer, etc., The apparatus and bus bar which comprise the said gas insulated switchgear are comprised by a single phase apparatus and a single phase bus, respectively, Three sets of single-phase buses of the first and second line-connected main buses and the first and second line-connected buses are arranged in three phases each horizontally to form a bus group. These bus groups consist of a stacking arrangement having a common vertical axis, and the one main line connecting main bus among the first and second inter line connecting main buses is the uppermost layer, and the other main line connecting main bus is the lowest layer. In the meantime, the first and second in-line connection buses are arranged in two layers, and the bus group is arranged in the same direction as the main axis of any bus and arranged in a positional relationship that overlaps substantially in a plane. The first to third circuit breakers of each of the first and second lines are constituted by vertical circuit breakers having upper and lower inlets, and these vertical circuit breakers are close to the side of the mother bus group, and the arrangement direction thereof is the mother bus group. Arranged to be parallel to the main axis to be made, and connected to the corresponding bus bar of the bus bar group, respectively. A gas insulated switchgear, characterized in that the lead bus is derived in a direction intersecting with the main axis direction made by the bus group. 2. The method of claim 1, wherein at least one of the first to third vertical circuit breakers is disposed at a position opposite to the derivation direction of the drawing bus bar connected to the in-line connection bus, with the in-line connection bus interposed therebetween. Gas insulated switchgear. The air insulation bushing is connected to the front-end | tip of the drawing bus bar of each phase, and the axis line which connects the bushing shaft of the air insulation bushing for three phases is arrange | positioned so that it may become parallel with the main axis of the said bus-group group. Gas insulation switchgear. The said 1st line is connected, The upper inlet part of a 1st breaker and the upper inlet part of a 2nd breaker are connected to the 1st in-line connection bus | line, and the lower inlet part of a 2nd breaker, Connect the lower inlet to the second in-line connecting bus, connect the second inter-connect main bus to the lower inlet of the first breaker, connect the upper inlet to the first inter-connect main bus, In the second circuit, the lower inlet of the first circuit breaker and the lower inlet of the second circuit breaker are connected to the first main line connecting main bus, and the upper inlet of the second circuit breaker and the upper inlet of the third circuit breaker It is connected to two main line connection main bus | wires, the upper inlet part of a 1st breaker is connected to the said 1st interline connection main busbar, and the lower inlet part of a 3rd breaker is connected to the said 2nd main line connection main bus | line. Gas insulated switchgear. The gas according to claim 1, wherein the first and second in-line connecting buses are arranged in two layers, and the spacing dimension thereof is approximately equal to the pitch between the upper inlet and the lower inlet of the vertical circuit breaker. Insulated switchgear. The gas insulated switchgear according to claim 1, wherein the horizontal height of the drawing bus bar is approximately aligned with the height of the upper inlet of the vertical circuit breaker. The opening of one side of the said connecting bus bar is the other in the vicinity which the horizontal bus bar connected to the upper-lower entrance part of a vertical circuit breaker, and both busbar shafts of an in-line connection bus bar cross | intersect. The gas insulated switchgear which arrange | positioned the disconnecting device which has an opening in the connection bus bar side in a 1st, 2nd line, and electrically connected each in series.

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