JP4928953B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a 1 1/2 CB type gas insulated switchgear in which all equipment used in a high voltage system (UHV class) is gas insulated, and in particular, a circuit breaker and a disconnecting switch are on the same plane. This is an improvement on the layout of the gas insulated switchgear.

In general, a gas-insulated switchgear is composed of a circuit breaker, a disconnector, a busbar, etc. filled with an insulating gas such as SF ₆ gas, all of which have a high-voltage charging unit housed in a metal container with a ground potential. . Since these gas-insulated switchgears are safe and reliable and can be arranged three-dimensionally, the installation area can be easily reduced. For this reason, gas insulated switchgears are frequently used in various places in recent years.

  For example, a gas-insulated switchgear in which a main bus portion is configured by air insulation has been proposed as in the technique described in Patent Document 1. However, in a gas-insulated switchgear including an air-insulated portion, an operator cannot enter within the air-insulated separation distance, and access to the equipment is restricted. In addition, heavy machinery such as cranes will not be approached as much as there are overhead wires, and work efficiency during inspections and recovery work in the event of an accident is low.

  Therefore, in the UHV class, which has a great influence on the system when an accident occurs, gas-insulated switchgear in which the main bus is also gas-insulated is the mainstream (for example, Patent Document 2). Hereinafter, a conventional example of a 1/1/2 CB type gas insulated switchgear in which the main bus is also gas insulated will be described with reference to the circuit diagram of FIG. The 11 / 2CB system is formed by electrically connecting three circuit breakers between two main buses.

  In the configuration of one line, three three-phase separation type circuit breakers CB are electrically connected in series between main buses BUS1 and BUS2. In addition, two disconnectors DS are attached to both sides of each circuit breaker CB. That is, disconnectors DS11 and DS12 are provided on both sides of the first breaker CB1, disconnectors DS21 and DS22 are provided on both sides of the second breaker CB2, and disconnectors DS31 and DS22 are provided on both sides of the third breaker CB3. Each DS32 is connected. Further, branch buses 14 and 24 are led out between the disconnectors DS12 and DS21 and between the disconnectors DS22 and DS31, respectively. In this example, bushings Bg1 and Bg2 are attached to the tips of the branch buses 14 and 24, respectively.

  Subsequently, layout examples of the gas insulated switchgear based on the circuit diagram of FIG. 8 are shown in FIGS. The following example is a three-phase separation type that is mainstream in a high voltage class. FIG. 9 is a plan view, FIG. 10 is a circuit cross-sectional view of FIG. 9, and FIG. FIG.

  The two main buses BUS1 and BUS2 are arranged substantially in parallel, and three horizontal circuit breakers CB1, CB2 and CB3 are arranged in series between the two main buses BUS1 and BUS2. Current transformers CT1 and CT2 are mounted on the circuit breaker CB1, and disconnectors DS11 and DS12 are stacked and arranged thereon. Although not shown in this figure, the disconnecting switches DS11 and DS12 usually have a built-in ground switch.

  The disconnector DS11 is connected to the main bus BUS1, and the disconnector DS12 is connected via the connection bus 13 to the disconnector DS21 attached to the circuit breaker CB2. A branch bus 14 is led out from the connection bus 13 and a bushing Bg1 is connected to the tip thereof. The circuit breakers CB2 and CB3 have the same configuration, and one circuit is configured with three circuit breakers.

  In the gas-insulated switchgear as described above, the so-called stacked configuration in which the current transformers CT1 and CT2 and the disconnecting devices DS11 and DS12 are arranged on the circuit breaker CB1 can achieve compactness, and the installation area can be reduced. Reduction is easy. Specifically, in a 500 kV system, the width of one line for three phases can be suppressed to less than 5 m, and the reduction effect of the entire substation is large (as a comparative example, a gas-insulated switchgear having a main bus portion as air insulation) When used in a 500 kV system, the distance between phases is required to be about 8 m, and the line width for three phases is 16 m or more).

In addition, since there is no need to secure a separation distance because the air insulation portion is not included, there is no restriction when accessing the equipment, and it is easy to carry in heavy equipment such as a crane. Therefore, it is possible to exhibit excellent checkability and recovery workability.
JP-A-11-69532 JP 11-355923 A

  However, in recent years, as the voltage of devices increases and the size increases, the weight of each device tends to increase. For this reason, in the system in which disconnectors and the like are stacked on the upper part of the circuit breaker, the rigidity of the circuit breaker arranged at the lower part must be strengthened. In addition, load concentration on the foundation also occurs, so strengthening the foundation itself is indispensable, resulting in an increase in construction costs.

  In addition, when a plurality of devices are stacked, it is necessary to sequentially remove heavy devices from the upper side at the time of inspection work and recovery work, so that work efficiency is low. Furthermore, while the stacking structure contributes to the reduction of the installation area, it involves an increase in the number of equipment and has a problem of low earthquake resistance.

  In particular, when it becomes a gas insulated switchgear of a class of 1000 kV, the power distribution amount of one substation increases dramatically, so that in the event of a power failure, the influence on the system becomes more serious than before. In other words, the gas-insulated switchgear used in high-voltage systems maintains the basic advantages of the device, compactness and economy, while maintaining a high level of work efficiency that enables quick inspection work and recovery work. Improvement and securing of high earthquake resistance were strongly demanded.

  The present invention has been proposed in order to solve the above-described problems. The object of the present invention is to avoid the stacking of equipment in the 1½ CB method in which the entire structure including the main bus is gas-insulated. Distributing foundation loads increases economic efficiency and seismic resistance, overcomes the increase in installation area due to the non-use of a stacked configuration, maintains compactness, and further improves work efficiency during inspections and restoration The object is to provide a gas insulated switchgear that contributes to improvement.

In order to achieve the above-mentioned object, the present invention comprises three-phase separated first, second and third circuit breakers electrically connected in series, and disconnectors attached to both sides of each circuit breaker. A connection bus, a first main bus connected to one end of the first circuit breaker, a second main bus connected to one end of the third circuit breaker, the first circuit breaker, and the A first branch bus electrically connected between the second circuit breakers; a second branch bus electrically connected between the second circuit breaker and the third circuit breaker; In the 1/1/2 CB type gas insulated switchgear comprising one line unit from a bushing or cable connection terminal provided at the tip of each branch bus, the first to third circuit breakers are: the three identical phase in each breaker constitutes the breaker row of three arranged on the same axis, the disconnector is Serial first to third all breaker with are connected to the lead-out portion of the two locations opened in the same horizontal direction, the three disconnector column six of the same phase disposed on the same axis The three breaker rows and the three disconnector rows are arranged alternately and in parallel on the same plane, and the first and second main buses have the same phase each other. The circuit breakers are arranged adjacent to each other and are horizontal and parallel to the circuit breaker row and the disconnecting device row so that at least one is positioned between the circuit breaker row and the disconnecting device row . And the plane on which the disconnector is arranged is the first layer, the surface on which the main busbar is arranged is the second layer, and the surface on which the branch busbar is installed is the third layer, and has a hierarchical structure It is a feature.

  In view of these points, in the present invention having the above-described configuration, the circuit breaker and the disconnecting device, which are important devices, are arranged independently on the same plane without being stacked. Therefore, it is not necessary to strengthen the rigidity of the lower equipment and the foundation which are required in the stacking method, and the construction cost can be suppressed. Moreover, since the entire apparatus is lowered by stopping the stacking of equipment, it is possible to improve the earthquake resistance.

  Moreover, it is possible to omit the work of removing the equipment, which is necessary in the stacking method, and the inspection and restoration work for the circuit breaker located on the lower side is quick and easy. Since the circuit breaker is the center of a protective device that opens and closes a large current in a short time, increasing its stability through reliable maintenance is nothing other than improving the quality of the entire substation.

  Further, in the present invention, the breaker train consisting of three identical phases and the disconnector train consisting of six identical phases paired with the breaker are arranged alternately and parallel to each other, A total of nine breakers and 18 disconnectors can be arranged in a space for three rows in which the width dimension of the device fits and a space for three rows in which the width size of the disconnector fits. That is, the space use efficiency in the same plane can be improved by arranging the breaker rows and the disconnector rows alternately and in parallel.

  Furthermore, in the present invention, at least one of the two main bus bars is arranged in a space between the circuit breaker row and the disconnection device row, so that a certain work space is secured in the vicinity of the circuit breaker, and even a little is vacant. If there is space, this is effectively used. For this reason, an increase in the installation area can be minimized without deteriorating workability, and the overall apparatus can maintain excellent compactness that is comparable to the conventional stacking method. .

  According to the gas insulated switchgear of the present invention, by stopping the stacking of equipment and dispersing the basic load, the construction cost is reduced, the economy and the earthquake resistance are improved, and the circuit breaker train consisting of three identical phases It is possible to maintain the compactness by arranging the disconnecting device rows composed of six identical phases alternately and in parallel, and at the same time, it can contribute to the improvement of work efficiency at the time of inspection and restoration.

  Hereinafter, typical embodiments according to the present invention will be described in detail with reference to FIGS. 1 is a plan view of the present embodiment, FIG. 2 is a side view of the same, FIG. 3 is a partially enlarged side view of FIG. 2, and FIG. 4 is a line cross-sectional view corresponding to FIG. The present embodiment is a 1 · 1/2 CB type gas insulated switchgear similar to the prior art shown in FIGS. 8 to 11, and the reference numerals in the figure are the same as those in FIGS. 8 to 11.

(1) Configuration of Representative Embodiment As shown in FIG. 1, three three-phase separated circuit breakers CB1, CB2, and CB3 electrically connected in series are connected to each phase (A phase, B phase, C phase) are arranged at equal intervals on the same axis. That is, in the first to third circuit breakers CB1 to CB3, three units having the same phase are arranged on the same axis, and three circuit breaker rows CB-A, CB-B, and CB-C are configured.

  The axial direction of the circuit breaker rows CB-A to CB-C is provided in parallel to the arrangement of the bushings Bg1 and Bg2 or the retaining tower T. Further, the interval (P in FIG. 1) between the circuit breakers CB in the circuit breaker rows CB-A to CB-C is set to about 1.5 times the tank main body length of the circuit breaker CB.

  The six phase-separated disconnectors DS paired with the circuit breakers CB of the same phase included in the circuit breaker rows CB-A, CB-B, and CB-C are arranged on the same axis, In addition, three disconnector rows DS-A, DS-B, and DS-C are configured.

  The above six device rows are arranged as follows. That is, A-phase circuit breaker train CB-A and disconnector train DS-A, B-phase circuit breaker train CB-B and disconnector train DS-B, C-phase circuit breaker train CB-C and disconnector train DS As shown in -C, adjacent to each same phase, the breaker rows and disconnector rows are alternately and parallel to each other on the floor level (the first layer F1 shown in FIGS. 2 and 3). Arranged independently.

  By the way, in the tank of the circuit breaker CB, two lead portions opened to the disconnector DS side are formed, and a horizontal nozzle is provided for each. Similarly, two outlets are formed in the tank of the disconnector DS, and an upper nozzle and a lower nozzle in the horizontal nozzle system are provided.

  Of these, the lower nozzle is opened to the circuit breaker CB side, and is directly connected to the circuit breaker CB via a vertically disposed insulating spacer SP (see FIGS. 2 and 3). In addition, a current transformer CT is installed in the vicinity of the connection portion between the circuit breaker CB and the disconnecting device DS.

  The other upper nozzle of the disconnector DS is opened in the direction of the disconnector train DS-A to DS-C, the disconnector DS11 is connected to the main bus BUS1 via the connection bus 12, and the disconnector DS32 is It is connected to the main bus BUS2 via the connection bus 25 (FIG. 8).

  In addition, four disconnectors DS12, DS21, DS22, DS31 that are not connected to the main buses BUS1, BUS2 are also connected to adjacent phases. That is, as shown in FIG. 4, the disconnecting device DS12 and the disconnecting device DS21 are connected via the connection bus 13, and the disconnecting device DS22 and the disconnecting device DS31 are connected via the connecting bus 23.

  The main bus BUS1 is arranged above the disconnector rows DS-A to DS-C, and the main bus BUS2 is connected by a connecting bus 25 having a vertical axis inclined, and the breaker rows CB-A to CB-C and the disconnectors Arranged above the rows DS-A to DS-C. The surface on which the main buses BUS1 and BUS2 are arranged is a second layer F2 provided at a position higher than the first layer F1 which is the floor level.

  The main buses BUS1 and BUS2 are both arranged horizontally. The bus axes of the main buses BUS1 and BUS2 are parallel to the circuit breaker rows CB-A to CB-C and the disconnecting device rows DS-A to DS-C, and the same phase is close to each other. Further, the interval between the other phases of the main buses BUS1 and BUS2 is the bus interval (L) shown in FIG. The L dimension is set to a value slightly wider than the tank main body diameter of the circuit breaker CB.

  The branch buses 14 and 24 are arranged in the basement (third layer B1) lower than the first layer F1, which is the floor level, so that the phases are superposed in the vertical direction, and the first and second circuit breakers are arranged. The CB1 and CB2 and the second and third circuit breakers CB2 and CB3 are derived from three-dimensionally intersecting with the circuit breaker row from a substantially intermediate position. Further, the branch buses 14 and 24 are raised to the first layer F1 side in the vicinity of the end equipment, and are connected to the bushings Bg1 and Bg2 at the low floor portion of the first layer F1.

(2) Operational effects of the present embodiment Next, operational effects of the present embodiment will be described. That is, in this embodiment, the circuit breaker CB and the disconnector DS are arranged independently on the first layer F1 that is on the same plane, so that the entire device can be lowered. Moreover, since the branch buses 14 and 24 can be connected to the bushings Bg1 and Bg2 at the low floor portion of the first layer F1, good earthquake resistance can be obtained.

  Specifically, in the UHV class air bushing, the length of the soot tube may exceed 10 m, so installation at a low position is advantageous from the viewpoint of earthquake resistance, and is also economically advantageous. However, depending on the topography of the substation and the situation of the building, the branch buses 14 and 24 can be derived not from the third layer B1 which is the basement but from the upper second layer F2 side.

  Further, since the disconnecting device DS is not stacked on the upper part of the circuit breaker CB, it is not necessary to strengthen the rigidity of the circuit breaker CB tank arranged at the lower part, and it is possible to avoid load concentration on the foundation, so that it is not necessary to strengthen the foundation itself. . For this reason, construction cost can be significantly reduced, and excellent economic efficiency can be obtained.

  In addition, in the present embodiment, the breaker rows CB-A to CB-C and the disconnector rows DS-A to DS-C and the bushings Bg1 and Bg2 are parallel to each other. The length can be made the shortest, and excellent economy can be obtained from this point.

  Further, since the interval between the circuit breakers CB (P in FIG. 1) is about 1.5 times the tank main body length of the circuit breakers CB, the tank main body length is approximately 1/2 on both sides of each circuit breaker CB. 2 space can be secured. Therefore, it is possible to take out one contact, which is the minimum unit of the circuit breaker CB having a two-point cut configuration, from either side. In addition, inspection work and the like can proceed simultaneously on both sides of the circuit breaker CB tank, and the working time can be greatly shortened.

  Moreover, even when removing the entire circuit breaker CB, it can be removed without removing other equipment, and the equipment stop range can be minimized and the disassembly time can be shortened. As described above, in the present embodiment, it is not necessary to remove the device on the upper side at the time of inspection and restoration work, so that the work can be facilitated and speeded up. As a result, work efficiency is greatly improved, and excellent reliability and safety can be ensured. In particular, with regard to the circuit breaker CB, which is the center of the protective device, it is possible to increase the stability by obtaining excellent workability, thereby contributing to the quality improvement of the entire substation.

  Moreover, in this embodiment, the opening part in the circuit breaker CB and the disconnector DS is a horizontal nozzle system, and the vertical arrangement of the insulating spacer SP is realized. Thereby, it is possible to reliably prevent foreign matter from staying in the insulating spacer SP, and to further improve the reliability.

  By the way, in this embodiment, since the circuit breaker CB and the disconnecting device DS are arranged on the same plane without being stacked, all the installation spaces of these devices are reflected in the installation area. Therefore, although the installation area is expected to increase, in this embodiment, the breaker rows CB-A to CB-C and the disconnecting device rows DS-A to DS-C are arranged alternately and parallel to each other. Thus, the use efficiency of the planar space is increased and the increase in the installation area is overcome.

  That is, the circuit breaker trains CB-A to CB-C and the disconnecting device trains DS-A to DS-C are each provided in a total of 6 device rows, 9 circuit breakers and 18 circuit breakers. A disconnector is installed to ensure a very high space factor. Moreover, in the high voltage class such as UHV, the circuit breaker CB having two break points and the breaker DS having one breaker contact are frequently used, so that the column length of one breaker CB in the axial direction is used. And the length of the column in the axial direction of the two disconnectors DS is approximately equal. For this reason, it is no exaggeration to say that there is no wasted space when this embodiment is adopted in the high voltage class.

  In addition, the circuit breaker CB arrangement interval (P) is the minimum distance required for inspection, and the branch buses 14 and 24 are derived without changing the pitch P, so that the installation area can be minimized. is there. Further, in the present embodiment, the main bus BUS2 is arranged above the breaker rows CB-A to CB-C and the disconnector rows DS-A to DS-C, supported diagonally upward by the connection bus 25. Therefore, a work space can be taken near the circuit breaker CB. As described above, in the present embodiment, it is possible to maintain compactness that is inferior to the conventional stacking method by maintaining the workability and increasing the utilization of the space in three dimensions.

  In addition, since the circuit breakers CB are arranged at the same interval, it is easy to standardize, design, and construct the equipment, save labor, and have high economic efficiency. Furthermore, since the branch buses 14 and 24 are drawn out from the intermediate portion between the circuit breakers CB, the distance between the legs of the circuit breaker CB and the disconnecting device DS can be sufficiently increased. Therefore, there is an advantage that the basic design is easy.

(3) Other Embodiments The present invention is not limited to the above-described embodiments, and includes the following embodiments. For example, the embodiment shown in FIG. 5 is characterized in that a line III is installed in addition to the lines I and II having the same layout as the embodiment shown in FIGS.

  The line III is arranged in parallel and adjacent to the line I. The disconnector DS11 attached to the first circuit breaker CB1 in the line I and the main bus BUS1 are connected by the connection bus 12, and the connection bus 12 is extended to the line III side, and the first bus in the line III is connected. The disconnector DS11 attached to the circuit breaker CB1 is connected. Further, the disconnecting device DS32 attached to the third circuit breaker CB3 in the line I and the main bus BUS2 are connected by the connecting bus 25, and the connecting bus 25 is extended to the line III side, so that the 3 is connected to a disconnector DS32 attached to the circuit breaker CB3.

  In the embodiment shown in FIG. 5, three lines are displayed, but in the case of four lines, they may be arranged on the extension line of line III and next to line II. According to such an embodiment, by appropriately combining series and parallel lines, it is possible to deal with various substation installation spaces and exhibit excellent flexibility in terms of layout.

  In addition, although it is not a 1 · 1/2 CB system in a strict sense, as shown in the circuit diagram of FIG. 6 and the plan view of FIG. 7, another set of the first to third circuit breakers CB1, CB2, CB3, The fourth breaker CB4 may be electrically connected in series, and four breakers, eight disconnectors, and three sets of branch buses 14, 24, 34 may be led out to constitute one unit. The basic arrangement configuration of the circuit breaker CB, the disconnecting switch DS, and the main bus BUS is the same as that of the embodiment shown in FIGS.

  In such an embodiment, in the 11/2 CB type gas insulated switchgear composed of the two line units shown in FIGS. 1 to 4, the basic configuration is extended as it is, and four circuit breakers per unit. , 8 disconnectors and 3 sets of branch buses are derived, and the system configuration requires a large number of lead lines. That is, as compared with an embodiment in which two feeders are drawn out by three circuit breakers, this embodiment has three feeders by four circuit breakers, and can improve the economics per feeder.

  In addition, the standardization, design, and construction of the components are easy, and labor saving can be promoted. This is also economically advantageous. In addition, without changing the basic structure of the 1 1/2 CB method, it is possible to adapt to various installation space of substations flexibly, and it will be in the direction of the extension line of existing equipment for future expansion. The impact of construction can be minimized.

  Moreover, although the said embodiment showed the serial arrangement | positioning structure, as shown in FIG. 5 as a modification, the units may be arranged in parallel or the combination of the series and the parallel due to the limitation of the length of the installation location. It is also possible to configure such that.

1 is a plan view of an exemplary embodiment of the present invention. The side view of FIG. The principal part enlarged view of FIG. FIG. 2 is a line cross-sectional view of FIG. 1. The top view of other embodiment of this invention. The circuit diagram of other embodiment of this invention. The top view of embodiment of FIG. FIG. 2 is a circuit diagram of a conventional 1 · 1 / 2CB gas insulated switchgear. The top view of the gas insulated switchgear of FIG. FIG. 10 is a cross-sectional view of the line in FIG. 9. The side view seen from the arrow Y direction of FIG.

Explanation of symbols

CB1 to CB4 ... circuit breakers DS11 to DS42 ... disconnectors BUS1, BUS2 ... main buses Bg1, Bg2 ... bushing CT ... current transformer SP ... insulating spacer F1 ... first layer F2 ... second layer B1 ... third layers 12, 13 , 23, 33, 35 ... connecting buses 14, 24, 34 ... branch buses

Claims (6)

Three-phase separated first, second and third circuit breakers electrically connected in series, disconnectors and connection buses attached to both sides of each circuit breaker, and one end of the first circuit breaker Electrically connected between the connected first main bus, the second main bus connected to one end of the third circuit breaker, and the first circuit breaker and the second circuit breaker; A first branch bus, a second branch bus electrically connected between the second circuit breaker and the third circuit breaker, and a bushing or cable provided at the tip of each branch bus In the 11/2 CB type gas insulated switchgear comprising one line unit from the connection terminal,
The first to third circuit breakers constitute three circuit breaker rows by arranging three units of the same phase in each circuit breaker on the same axis.
The disconnector is connected to each of two outlets that are opened in the same horizontal direction in all of the first to third circuit breakers, and 6 units of the same phase are arranged on the same axis 3 A series of disconnectors,
The three breaker rows and the three disconnector rows are arranged alternately and in parallel on the same plane,
The first main bus and the second main bus are adjacent to each other in the same phase and are horizontal, and are parallel to the breaker row and the disconnector row, and at least one of the breaker row and the disconnection line. While placed so as to be located between the instrument rows ,
The plane on which the breaker and the disconnector are arranged is the first layer,
The surface on which the main bus bar is arranged is a second layer,
A gas insulated switchgear characterized by having a hierarchical structure with the surface on which the branch bus is installed as a third layer . As the first layer of the floor level, the provided second layer altitude than the first layer, the third layer in claim 1, characterized in that provided in the lower place than the first layer The gas insulated switchgear described. The branch buses installed in the third layer are arranged by overlapping each phase in the vertical direction, and from substantially the middle position between the first and second circuit breakers and the second and third circuit breakers. Derived by crossing the circuit breaker row, and rising to the first layer side in the vicinity of the end, and at least one of a bushing, a lightning arrester and a voltage transformer between the first layer and the third layer The gas insulated switchgear according to claim 2 , wherein the gas insulated switchgear is connected to a device. The main buses of the same phase that are adjacent to each other are arranged such that a bus interval between different adjacent phases is wider than the main body diameter of the circuit breaker and avoids the center of gravity of the circuit breaker. The gas insulated switchgear according to any one of 1 to 3 . Wherein each include a plurality of line units, one of the claims 1-4, characterized in that said breaker column and the disconnector columns in each line unit is disposed in series or in parallel so that each forms a substantially identical axis The gas insulated switchgear according to claim 1. The first, second and third circuit breakers are electrically connected in series with a phase-separated fourth circuit breaker provided with disconnectors and connecting buses on both sides,
By electrically connecting a third branch bus between the third and fourth circuit breakers, a total of 4 circuit breakers, 8 disconnectors and 3 sets of branch buses are formed. The gas insulated switchgear according to any one of claims 1 to 5 , wherein an expansion line unit is provided.

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