HK1143248B - Gas-insulated switch-gear apparatus - Google Patents

Description

Gas insulated switchgear

Technical Field

The present invention relates to a gas-insulated switchgear, and more particularly, to a gas-insulated switchgear of a half CB type in which 3 circuit breakers are connected in series between a pair of main buses.

Background

When a high reliability is required for a large-capacity substation or the like as a Circuit system of a gas insulated switchgear, a bus system of a so-called one-half CB (Circuit Breaker) structure is sometimes used. In this bus-type gas-insulated switchgear, 3 circuit breakers connected in series to constitute a unit structure are arranged between a pair of main buses. That is, this method uses 3 breakers for drawing 2 lines, does not affect the system even when an accident occurs in the bus, and does not stop the lines when the breakers and the like are inspected.

As a conventional technique of a bus bar system using such a half CB structure, for example, a gas insulated switchgear disclosed in patent document 1 is known. In patent document 1, first, second, and third breakers each having a switch provided on both sides thereof are electrically connected in series, and one end of each of the first and third breakers is connected to a main bus. Further, the branch bus is led out from between the first breaker and the second breaker and between the second breaker and the third breaker. Further, 2-way branching is provided in any of the switches provided on the opposing surfaces of the first, second, and third breakers, and a branch bus is connected to the branching portion.

Patent document 1: japanese patent laid-open No. 2002-186124 (page 2, FIG. 1)

Disclosure of Invention

Problems to be solved by the invention

However, the above-described prior art has the following problems. That is, in the conventional gas-insulated switchgear having a half CB structure disclosed in patent document 1, since 3 circuit breakers are arranged in series between a pair of main buses on the same straight line parallel to the axial direction of the main buses, the dimension of the circuit breakers in the axial direction becomes large, and a large installation area is required for the entire gas-insulated switchgear. In a transformer apparatus or the like in which a gas insulated switchgear is installed, there is a great demand for reduction in installation area due to difficulty in obtaining construction sites and the like when the gas insulated switchgear is located outdoors, and there is a great problem in how to install the gas insulated switchgear in a limited space by, for example, restriction of space in a building when the gas insulated switchgear is located indoors, and how to improve accommodation efficiency in the limited space.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a gas insulated switchgear capable of reducing the arrangement dimension of a breaker in the axial direction, reducing the arrangement dimension of the breaker in the direction perpendicular to the axial direction, and reducing the installation area.

Means for solving the problems

In order to solve the above problems and achieve the object, a gas insulated switchgear according to the present invention includes: first and second main bus bars arranged in parallel; first, second, and third horizontal breakers arranged in line along the axial direction of the two main buses, having axes perpendicular to the axial direction of the two main buses, electrically connecting the two main buses in series, and having 1 pair of additional switches respectively on both sides; first and second branch lines led out from between the first circuit breaker and the second circuit breaker and from between the second circuit breaker and the third circuit breaker, respectively; and the first cable head and the second cable head are respectively connected with the first branch line and the second branch line, and the first cable head and the second cable head are configured to be positioned on a straight line vertical to the axis directions of the two main buses in the center of the first cable head and the center of the second cable head under overlooking.

ADVANTAGEOUS EFFECTS OF INVENTION

In the present invention, 3 circuit breakers are arranged in line in the axial direction of two main bus bars with their respective axes directed in the direction perpendicular to the axial direction of the two main bus bars, and 2 cable heads are arranged such that a straight line connecting the respective centers of the 2 cable heads is perpendicular to the axial direction of the two main bus bars in a plan view. Accordingly, the size between the 2 main bus bars on which the circuit breaker is arranged, that is, the arrangement size of the circuit breaker in the axial direction can be reduced, and the size of the circuit breaker in the direction perpendicular to the axial direction can also be reduced, so that a gas-insulated switchgear in which the installation area of the entire equipment can be reduced can be obtained. Therefore, in an installation environment where there is a demand for size limitation, applicability in a limited installation range can be improved.

Drawings

Fig. 1 is a plan view showing a structure of a gas insulated switchgear according to an embodiment of the present invention.

Fig. 2 is a side view (II-II direction view) of the embodiment as viewed in the direction of the arrow II-II of fig. 1.

Fig. 3 is a side view (III-III view) of the embodiment as viewed in the direction of the arrow III-III of fig. 1.

Fig. 4 is a side view (IV-IV view) of the embodiment as viewed in the direction of arrows IV-IV of fig. 1.

Fig. 5 is a side view (V-V view) of the embodiment as viewed in the direction of arrow V-V of fig. 1.

Fig. 6 is a single-line diagram of a gas insulated switchgear according to an embodiment of the present invention.

Description of the reference symbols

1. 2 main bus

3. 4, 5 circuit breaker

11. 12, 21, 22, 31, 32 switch

13. 14, 23, 24, 33, 34 current transformer

15. 25, 26 short bus

41. 43 branch line switch

42. 44 cable head

51. 52 branch line

Detailed Description

Hereinafter, embodiments of the gas insulated switchgear according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.

Provided is an implementation mode.

Fig. 1 is a plan view showing a structure of a gas insulated switchgear according to an embodiment of the present invention. Fig. 2 is a side view (II-II view) of the present embodiment as viewed in the direction of arrow II-II in fig. 1, fig. 3 is a side view (III-III view) of the present embodiment as viewed in the direction of arrow III-III in fig. 1, fig. 4 is a side view (IV-IV view) of the present embodiment as viewed in the direction of arrow IV-IV in fig. 1, and fig. 5 is a side view (V-V view) of the present embodiment as viewed in the direction of arrow V-V in fig. 1. Fig. 6 is a single-line diagram of the gas insulated switchgear according to the present embodiment.

First, the overall apparatus configuration will be described with reference to fig. 6. As shown in the single-line diagram of fig. 6, a circuit breaker 3 (first circuit breaker), a circuit breaker 4 (second circuit breaker), and a circuit breaker 5 (third circuit breaker) are electrically connected in series between a main bus 1 (first main bus) and a main bus 2 (second main bus). A switch 11 and a switch 12 are connected to both sides of the breaker 3, a current transformer 13 is provided between the breaker 3 and the switch 11, and a current transformer 14 is provided between the breaker 3 and the switch 12. Similarly, a switch 21 and a switch 22 are connected to both sides of the breaker 4, a current transformer 23 is provided between the breaker 4 and the switch 21, and a current transformer 24 is provided between the breaker 4 and the switch 22. Similarly, a switch 31 and a switch 32 are connected to both sides of the breaker 5, a current transformer 33 is provided between the breaker 5 and the switch 31, and a current transformer 34 is provided between the breaker 5 and the switch 32. In order to lead out a main circuit to an external power transmission line, a transformer, or the like, a branch line 51 is led out from a connection line between the connection switch 12 and the switch 21, and the branch line 51 is connected to the cable head 42 via the branch line switch 41, and further led out from a cable (not shown) connected to the cable head 42. Similarly, a branch line 52 is drawn from a connection line connecting the switch 22 and the switch 31, and the branch line 52 is connected to the cable head 44 via the branch line switch 43, and is led out from a cable (not shown) connected to the cable head 44. Such a structure is called a half CB (circuit breaker) bus system. Fig. 6 shows 3 lines having such a structure of one half CB system.

In the present embodiment, the branch lines 51 and 52 are drawn out by cables, but the present invention is not limited thereto, and may be drawn out by an air bushing, for example. In the case of a gas liner, portions of the cable heads 42, 44 are replaced with gas liners.

In the illustrated example, each switch is a switch with a ground contact, but the present invention is not limited thereto, and a switch without a ground contact may be used. In the following, the grounding switch is not attached, but only a switch will be described.

Next, the arrangement structure of the apparatus of the present embodiment will be described with reference to fig. 1 to 5. FIG. 1 is a top view, shown 90 degrees out of the connection diagram of FIG. 6. In addition, 1 line with a reference numeral in the drawing is explained below. As shown in fig. 1, 3 breakers, namely, a lateral breaker 3, a breaker 4, and a breaker 5, the longitudinal direction of which is horizontally arranged with respect to an installation surface, are respectively installed between a main bus 1 and a main bus 2 which are arranged in parallel. The breakers 3 to 5 are arranged in line with their respective axes directed in a direction perpendicular to the axial direction of the main buses 1 and 2 along the axial direction of the main buses 1 and 2. The main bus bar 1 and the main bus bar 2 are, for example, 3-phase type. The 3 breakers 3 to 5 are electrically connected in series, one end of the breaker 3 is connected to the main bus 1, and one end of the breaker 5 is connected to the main bus 2. Further, the 2 cable heads 42 and 44 are arranged on the same straight line perpendicular to the axial direction of the main bus bars 1 and 2. That is, the center of the cable head 42 and the center of the cable head 44 are positioned on the same straight line perpendicular to the axial direction of the main bus bars 1 and 2, and the cable heads 42 and 44 are arranged.

The breaker 3 and the breaker 4 are connected by a horizontal circuit (not shown), and a branch line switch 41 is disposed in the horizontal circuit connecting the breaker 3 and the breaker 4. Similarly, the breaker 4 and the breaker 5 are connected by a horizontal circuit (not shown), and a branch switch 43 is provided in the horizontal circuit connecting the breaker 4 and the breaker 5. Since the branch line switches 41 and 43 are disposed between the breakers 3 and 4, the path shapes of the horizontal circuits are different from each other. In particular, the horizontal circuit connecting the breaker 4 and the breaker 5 is led out to the breaker 3 side, and then connected to the branch line switch 43. From a horizontal circuit connecting the circuit breaker 3 and the circuit breaker 4, the branch line 51 is led out from the cable through the branch line switch 41 and the cable head 42 disposed in the horizontal circuit. Similarly, from a horizontal circuit connecting the circuit breaker 4 and the circuit breaker 5, the branch line 52 is led out from the cable by the branch line switch 43 and the cable head 44 disposed in the horizontal circuit. In the present embodiment, the devices such as the breaker and the switch shown in fig. 1 are all 3-phase devices.

Next, each part will be described in further detail with reference to a side view of the part corresponding to the planar arrangement of fig. 1.

Fig. 2 is a view from direction II-II of fig. 1, and is a side view of the installation site of the circuit breaker 3. As shown in fig. 2, the main bus bars 1 and 2 are arranged in parallel, and the main bus bar 2 is arranged higher than the main bus bar 1 in the height direction. A switch 11 is connected to a main bus 1, a short bus 15 is connected to the switch 11, the short bus 15 extends in a direction perpendicular to the axial direction of the main bus 1 and in the horizontal direction, and a breaker 3 directly connected to a current transformer 13 is disposed on the axial line of the short bus 15. On the other end side of the circuit breaker 3, a current transformer 14 is mounted facing vertically upward, and a switch 12 is further provided above it.

Next, the structure of the intermediate point between the circuit breaker 3 and the circuit breaker 4 will be described with reference to the III-III view of fig. 3. As described above, the switch 12 on the breaker 3 side and the switch 21 on the breaker 4 side are connected by the horizontal circuit, and the branch line switch 41 is disposed in the horizontal circuit. Actually, since both conductors constituting the horizontal circuit and the switch contact of the branch line switch 41 are built in the branch line switch 41, not shown, 3 switches 12, 41, 21 are arranged in a connected shape as viewed from the outside (see fig. 1). This is a structure adopted to connect the two breakers 3 and 4 at the shortest possible distance, and if there is a sufficient installation dimension in the axial direction of the main buses 1 and 2, the horizontal circuit may be configured by a short bus connecting the switch 12 and the switch 21, and the branching switch 41 may be provided in the middle of the short bus.

A cable head 42 is connected to the branch line switch 41, and a cable (not shown) is drawn out toward a vertically lower installation surface as a branch line. The cable head 42 is disposed on the opposite side of the main bus 2 as the adjacent main bus, that is, on the main bus 1 side at this time, with respect to the horizontal circuit. The cable head 42 may be disposed on the main bus bar 2 side with respect to the horizontal circuit.

Similarly, a cable head 44 is connected to the branch line switch 43, and a cable (not shown) is drawn out toward a vertically lower installation surface as a branch line. The horizontal circuit connecting the switch 22 and the switch 31 is configured to make the shortest connection between the two breakers 3 and 4, as described above. The cable head 44 is disposed on the opposite side of the adjacent main bus, i.e., the main bus 1, i.e., on the main bus 2 side at this time, with respect to the horizontal circuit. The cable head 44 may be disposed on the main bus bar 1 side with respect to the horizontal circuit.

Next, the structure of the installation site of the circuit breaker 4 will be described with reference to the IV-IV view of fig. 4. A current transformer 23 is disposed vertically below the switch 21 connected to the branch line switch 41, and the lower portion thereof is connected to one end side of the breaker 4. A current transformer 24 is provided on the other end side of the horizontally arranged breaker 4, and the switch 22 is connected via a short bus 25 that is directed vertically upward.

Next, the structure of the installation site of the breaker 5 will be described with reference to the V-V view of fig. 5. A current transformer 34 is disposed vertically below the switch 32 connected to the main bus 2, and the lower part thereof is connected to one end side of the breaker 5. A current transformer 33 is provided on the other end side of the horizontally arranged breaker 5, and the switch 31 is connected via a short bus 26 that is directed vertically upward.

As described above, in the gas insulated switchgear according to the present embodiment, the circuit breaker 3, the circuit breaker 4, and the circuit breaker 5 are electrically connected in series between the main bus 1 and the main bus 2 arranged in parallel so as to be bent 2 times into an コ shape in a plan view, and are reciprocated between the main buses 1 and 2, and in addition, 2 cable heads 42 and 44 drawn out from the horizontal circuit connecting the circuit breakers 3 and 4 and the circuit breakers 4 and 5, respectively, through the branching line switches 41 and 43 are arranged on the same straight line perpendicular to the axial direction of the two main buses.

As described above, according to the present embodiment, in the gas insulated switchgear having the half CB structure, since the 3 breakers 3, 4, and 5 are arranged in line in the axial direction of the main bus bars 1 and 2 with their axes directed in the direction perpendicular to the axial direction of the main bus bars 1 and 2, the dimension between the two main bus bars 1 and 2 where the breakers 3, 4, and 5 are arranged (that is, the arrangement dimension of the breakers 3, 4, and 5 in the axial direction) can be reduced. In accordance with this, the 2 cable heads 42 and 44 led out from the horizontal circuits connecting the circuit breakers 3 and 4 and the circuit breakers 4 and 5 through the branching line switches 41 and 43 are arranged on the same straight line perpendicular to the axial direction of the two main buses 1 and 2, whereby the arrangement dimension of the circuit breakers 3, 4 and 5 in the direction perpendicular to the axial direction can be reduced. Therefore, a gas-insulated switchgear capable of reducing the installation area of the entire apparatus can be obtained. Therefore, for example, if the gas insulated switchgear is used in indoor substation equipment, the gas insulated switchgear can be provided which is improved in applicability to a limited installation range and is excellent in economical efficiency.

In particular, the branch lines 51 and 52 are led out from the horizontal circuits connecting the circuit breakers 3 and 4 and the circuit breakers 4 and 5 through the branch line switches 41 and 43 and the cable heads 42 and 44, respectively, and the cable heads 42 and 44 are arranged on the same straight line perpendicular to the axial direction of the two main buses 1 and 2, so that the mounting areas required for the cable heads can be integrated, and the occupied dimension of the main buses 1 and 2 in the axial direction of each line can be reduced.

Industrial applicability of the invention

As described above, the gas insulated switchgear according to the present invention contributes to reduction of the installation area in a substation or the like.

Claims (3)

1. A gas-insulated switchgear device, comprising:

first and second main buses configured in parallel;

first, second, and third breakers arranged in line along the axial direction of the two main buses, having axes perpendicular to the axial direction of the two main buses, electrically connecting the two main buses in series, and having 1 pair of additional switches respectively at both sides;

first and second branch lines led out from between the first circuit breaker and the second circuit breaker and from between the second circuit breaker and the third circuit breaker, respectively; and

first and second cable heads connected to the first and second branch lines, respectively,

the first cable head and the second cable head are configured in such a way that the center of the first cable head and the center of the second cable head are positioned on a straight line perpendicular to the axial direction of the two main bus bars in a plan view,

the second main bus is arranged higher than the first main bus, and the switch arranged between the first, second, and third breakers and the switch arranged between the second main bus and the third breaker are arranged in a direction perpendicular to the first, second, and third breakers and in a direction perpendicular to the first and second main buses.

2. Gas-insulated switchgear device according to claim 1,

the first branch line is led out from a first horizontal circuit connecting the first circuit breaker and the second circuit breaker, through a first branch line switch and the first cable head by a cable,

the second branch line is led out from a second horizontal circuit connecting the second breaker and the third breaker through a second branch line switch and the second cable head by a cable.

3. A gas-insulated switchgear device, comprising:

first and second main buses configured in parallel;

first, second, and third breakers arranged in line along the axial direction of the two main buses, having axes perpendicular to the axial direction of the two main buses, electrically connecting the two main buses in series, and having 1 pair of additional switches respectively at both sides;

first and second branch lines led out from between the first circuit breaker and the second circuit breaker and from between the second circuit breaker and the third circuit breaker, respectively; and

first and second gas bushings connected to the first and second branch lines, respectively,

the first and second gas bushings are arranged such that the center of the first gas bushing and the center of the second gas bushing are located on a straight line perpendicular to the axial direction of the two main bus bars in a plan view,

the second main bus is arranged higher than the first main bus, and the switch arranged between the first, second, and third breakers and the switch arranged between the second main bus and the third breaker are arranged in a direction perpendicular to the first, second, and third breakers and in a direction perpendicular to the first and second main buses.