JPH08237824A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE: To provide a gas-insulated switchgear whose insulating performance and economical efficiency are enhanced and whose installation area is reduced by shortening the length of a duct bus. CONSTITUTION: Transverse lead parts 23 which protrude in the transverse direction are installed at breakers for bypass switches in bypass circuits. In addition, main circuits at the inside of valve halls 11 and the breakers are connected by a plurality of connecting buses 16 which are extended at right angles to the arrangement direction of the valve halls 11 and by buses, for the bypass circuits, which connect the connecting buses to the breakers and which are extended along the arrangement direction of the valve halls 11. In addition, connecting points of the main circuits to the bypass circuits and DC reactors 6 in communication circuits are connected by buses, for the communication circuits, which are arranged in parallel with the buses for the bypass circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a valve hole accommodating a main circuit for AC / DC conversion, a bypass circuit having a bypass switch circuit breaker, and a communication circuit having a DC reactor. The present invention relates to a gas-insulated switchgear used in a power substation, and particularly to an improvement in the layout configuration of a bus line for connecting a main circuit and a bypass circuit or a main circuit and a communication circuit.

[0002]

2. Description of the Related Art Generally, there are a DC power transmission system and an AC power transmission system as power transmission systems. In the past, the AC power transmission method was used in many cases because voltage conversion was easy, but the AC power transmission method is not always more advantageous for ultra-high voltage / long-distance power transmission. Further, in power cable systems such as underground and undersea, it is known that the DC power transmission method is more advantageous than the AC power transmission method in terms of the limit distance due to charging current and the insulation performance of the cable.

Therefore, recently, a high voltage DC transmission system such as a ground return system or a neutral point grounding system has been frequently used. In such a high voltage DC transmission system, a main circuit having a main valve for AC / DC conversion is bridge-connected to form a valve group.
A bypass circuit having a bypass switch is connected to each main circuit. Further, a connecting circuit such as a main line, a main line spare, or a neutral line is drawn out from a connection point between each main circuit and the bypass circuit.

An example of the high voltage DC transmission system as described above will be specifically described based on the single line connection diagram shown in FIG. A main valve 5 for AC / DC conversion is provided in the main circuit A, and a bushing 4, a disconnector 2 and a ground switch 3 are connected to both ends of the main valve 5. In the DC power transmission system shown in FIG. 8, such main circuits A are bridge-connected for four sets to form a valve group. In each main circuit A, the main valve 5, bushing 4 and disconnector 2
Are housed inside a building called valve hole 11. Further, a bypass circuit B is connected in parallel to each main circuit A. A bypass switch circuit breaker 1 is provided in the bypass circuit B, and a ground switch 3 and a disconnector 2 are connected to both ends of the circuit breaker 1.

From the connection point between the main circuit A and the bypass circuit B, communication circuits C1 to C4 are drawn out. A DC reactor 6, a disconnector 2 and a ground switch 3 are provided in each of the communication circuits C1 to C4. Further, at the tip of each of the communication circuits C1 to C4, there is provided a cable head 7 that serves as a connection portion with a power cable. In the example of FIG. 8, the connecting circuits C1 and C2 located at both ends in the figure are main lines, the connecting circuit C3 located on the left side of the center is a neutral line, and the connecting circuit C4 located on the right side of the center is a main line spare.

By the way, there is a gas-insulated switchgear as a switchgear used in the above high-voltage DC transmission system. A gas-insulated switchgear is a device that consists of a gas-insulated device in which a switch, a charging part, and other device body parts are housed in a container filled with insulating gas, and has high insulation reliability, downsizing, and safety. It has the advantage of being excellent.
Therefore, in recent years, a gas insulated switchgear is generally used in a high voltage DC transmission system.

Referring now to FIGS. 9-11, FIG.
The arrangement configuration of the gas insulated switchgear applied to the bypass circuit and the communication circuit of the high-voltage DC transmission system shown in FIG. 9 is a plan view showing the arrangement of the gas insulated switchgear, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a side view of the bypass switch circuit breaker 1 in the gas insulated switchgear.
As shown in FIG. 9, the four valve holes 11 are arranged in a straight line along the main road 20. Although not shown in FIG. 9, the main valve 5, the bushing 4, and the disconnector 2 of the main circuit A are housed in the valve hole 11 as already described in the single wire connection diagram of FIG. Between these four valve holes 11 and the main road 20,
The bypass switch circuit breaker 1, the disconnecting switch 2 and the ground switch 3 are set as one set, and a total of four sets are arranged in line along the arrangement direction of the valve hole 11. As described above, these bypass switch circuit breaker 1 and disconnector 2
And the grounding switch 3 constitutes the bypass circuit B.

Between each valve hole 11 and the circuit breaker 1, as a bus line for connecting the main circuit A and the bypass circuit B, a connection bus line 16 and a bypass circuit bus line 14 are provided.
Is provided. Of these, the connecting busbar 16 extends in a direction orthogonal to the main road 20 and connects the valve hole 11 and the bypass circuit busbar 14. In addition, the bypass circuit bus bar 14 extends along the main road 20 and connects the circuit breaker 1 and the connection bus bar 16 via the connection portion 8. Note that, as shown in FIG. 10, the portion of the connecting bus 16 that intersects with the main road 20 is arranged in a cave 20a excavated underground in the main road 20.

Further, from the connection point between the connecting bus 16 and the bypass circuit bus 14, the main circuit A and the connecting circuits C1 to C4 are provided.
Bus line 15 for connecting circuit as a line bus line for connecting
Has been pulled out. Bus 15 for connecting circuit is main road 2
It extends in the direction orthogonal to 0, and the connecting portion 16 of the connecting busbar 16 and the bypass circuit busbar 14, and the DC reactor 6
It is connected to the connection part 9 of.

The DC reactors 6 and the cable heads 7 in the connecting circuits C1 and C2, which are the main lines, are arranged at two positions facing both ends of the four valve holes 11 arranged side by side. The connecting portions 9 of these DC reactors 6 are provided adjacent to each other at two locations on the same side surface of the DC reactor 6. Further, the DC reactor 6 and the cable head 7 of the connecting circuits C3 and C4 which are the neutral line and the main line spare are arranged near the center in the figure.

By the way, as shown in FIG. 11, the bypass switch circuit breaker 1 is formed with an upper lead-out portion 1a protruding upward. A detachable busbar 32 that is detachable from the bypass circuit busbar 4 is connected to the upper lead-out portion 1a via a horizontally arranged insulating spacer 30 and a substantially T-shaped connecting portion 31.

[0012]

The above conventional gas-insulated switchgear has the following problems. That is, since the bypass switch circuit breaker 1 requires the detachable busbar 32, the pipeline busbar becomes long, the number of members increases, and the configuration becomes complicated. In addition, generally, if the conduit bus bar is long, a crossing electric field is likely to be generated by a foreign metal, which is not preferable in terms of insulation performance. In particular, in the DC power transmission method, the crossing electric field of metal foreign matter is significantly lower than that in the AC current. Therefore, in order to ensure excellent insulation performance, it is an indispensable factor to shorten the pipeline busbar.

Moreover, the circuit breaker 1 is replaced with the bypass circuit bus 1
When removing from the circuit breaker 4, it is necessary to first remove the detachable bus bar 32 from the circuit breaker 1 and then remove the circuit breaker 1. Therefore, handling work such as removing and reattaching the circuit breaker 1 was troublesome. In addition, since the insulating spacers 30 are arranged horizontally, dust and the like are likely to accumulate in the insulating spacers 30 and the degree of contamination is high.

Further, the DC reactor 6 and the cable head 7 in the connecting circuits C1 and C2 are arranged apart from each other. Therefore, the installation area of the gas insulated switchgear has increased. The installation area of the gas-insulated switchgear is strongly desired to be reduced at present because the construction site of the power substation is difficult to obtain. Moreover, in correspondence with the arrangement of the DC reactor 6 and the cable head 7, the cable cave and the cable end processing section are also arranged in a dispersed manner. As a result, foundation work and power cable routing work become difficult,
The construction cost was soaring, which was economically disadvantageous.

As described above, in the conventional gas-insulated switchgear, when the bypass switch circuit breaker has the upper lead-out portion, a detachable bus bar is required, which complicates the construction, and improves workability and stain resistance. The sex has decreased. further,
When DC reactors and cable heads are distributed, the installation area increases due to the distributed layout of the communication circuits.
Moreover, it was difficult to secure excellent insulation performance because the length of the bus line was long. In addition, it is economically disadvantageous because foundation work and power cable routing work are difficult.

The gas-insulated switchgear of the present invention has been proposed to solve the above problems, and its main purpose is to improve the insulation performance and economical efficiency and to reduce the installation area of the device. is there.

More specifically, the object of the invention as defined in claim 1 is to simplify the structure by providing a side opening portion in the bypass switch circuit breaker of the bypass circuit, and at the same time, to improve handling workability and stain resistance. It is to improve sex.
An object of the invention described in claim 2 is to reduce the installation area of the device by centrally arranging the DC reactor and the cable head part. It is an object of the invention according to claim 3 to reduce the installation area of the device by arranging two pipeline bus bars in a stacked manner.

An object of the present invention is to reduce the installation area of the apparatus and improve the economical efficiency by accommodating the two conduit busbars in the collective conduit busbar. An object of the invention described in claims 5 and 6 is to shorten the busbar length of the busbar for the communication circuit to reduce the installation area of the device and improve the insulation performance.

[0019]

In order to achieve the above-mentioned object, the invention according to claim 1 has a plurality of valve holes linearly arranged, a main circuit housed in each valve hole, A bypass circuit connected to the main circuit, a communication circuit drawn from a connection point between the main circuit and the bypass circuit is provided, in a gas-insulated switchgear used in a DC power transmission system substation, The main circuit is provided with a main valve for AC / DC conversion, the bypass circuit is provided with a bypass switch circuit breaker having a lateral projecting portion protruding in the lateral direction, and the communication circuit is provided with a DC reactor. Between the main circuit and the bypass switch circuit breaker, a plurality of connecting bus bars extending orthogonally to the direction of arrangement of the valve hole, the connecting bus bar and the bypass switch circuit breaker. Connected by a bypass circuit bus bar extending along the arrangement direction of the valve hole, the bypass circuit bus bar is arranged horizontally with respect to the lateral outlet of the bypass switch circuit breaker, the main circuit The connecting point of the bypass circuit and the DC reactor are connected by a connecting circuit busbar arranged in parallel with the bypass circuit busbar.

According to a second aspect of the present invention, a plurality of the DC reactors are locally arranged in a concentrated manner, and a cable head portion which is a coupling portion with a power cable is arranged in a concentrated manner in the vicinity of the DC reactors. It is characterized by being done.

The invention according to claim 3 is characterized in that the bypass circuit bus bar and the communication circuit bus bar are arranged in a laminated manner.

According to a fourth aspect of the invention, the bypass circuit bus bar and the communication circuit bus bar are housed in a collective pipeline bus bar.

According to a fifth aspect of the present invention, the DC reactor is arranged such that its side surfaces parallel to each other are orthogonal to the direction in which the valve holes are arranged, and the side surfaces of the DC reactor and the connecting circuit are connected to each other. It is characterized in that a connecting portion for connecting with the bus bar is arranged.

In a sixth aspect of the present invention, the branch portion extending from the main circuit to the connecting circuit busbar is provided between the connection point between the main circuit and the bypass circuit and the bypass switch circuit breaker. It is characterized by being arranged.

[0025]

The operation of the present invention having the above-mentioned structure is as follows. That is, in the invention of claim 1,
Since the side opening portion is formed in the bypass switch circuit breaker and the bypass circuit bus bar is arranged horizontally with respect to the side outlet portion, the detachable bus bar can be eliminated. Further, since the circuit breaker is removed in the horizontal direction, the handling work such as removal and reattachment can be easily performed. Furthermore, since it is possible to vertically arrange the insulating spacers attached to the circuit breaker, it becomes difficult for dust and the like to accumulate in the insulating spacers, and the stain resistance can be improved.

In the second aspect of the invention, since the DC reactor and the cable head portion in the communication circuit are locally concentrated, the installation area of the device can be reduced. Moreover, since the cable cave and the cable terminal processing unit can be gathered in one place, it is possible to easily perform the work such as foundation work and power cable routing.

According to the third aspect of the present invention, the bypass circuit bus bar and the connecting circuit bus bar are laminated and arranged, so that the site area for installing the connecting circuit bus bar can be reduced in the related art. Therefore, the installation area can be reduced as the entire device.

In the invention of claim 4, the bypass circuit bus bar and the communication circuit bus bar are housed in the collective pipeline bus bar, so that in addition to the function of the invention of claim 2, a bus bar and an insulating gas are added. Since they can be shared, there is an effect that the material cost can be reduced.

According to the fifth aspect of the invention, since the connecting portions for connecting the DC reactor and the bus for the communication circuit are arranged on the pair of side surface portions of the DC reactor which are orthogonal to the arrangement direction of the valve hole, the valve hole is formed. The size of the DC reactor itself extending in the arrangement direction supplements the length of the bus for the communication circuit. Therefore, compared with the case where such a connection part is arranged on the same side surface of the DC reactor,
The bus length of the bus for the communication circuit can be shortened.

According to the sixth aspect of the invention, the branch portion extending from the main circuit to the connecting circuit busbar is moved to the bumper switch circuit breaker side rather than the connection point between the main circuit and the bypass circuit. As a result, the bus length at the branch portion can be reduced.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the gas-insulated switchgear according to the present invention will be specifically described below with reference to FIGS. The single-line connection diagram of the high-voltage DC transmission system adopting this embodiment is the same as the conventional example shown in FIG. Therefore, the same members as those of the conventional example shown in FIG. 9 are designated by the same reference numerals, and the description thereof will be omitted. Also, in each of the embodiments, the same members are designated by the same reference numerals.

[1] First Embodiment A first embodiment will be described with reference to FIG. The first embodiment is an embodiment including the invention described in claims 1 and 2.

[1-1] Configuration of the First Embodiment As shown in the drawing, a bypass switch circuit breaker 21 is arranged on a straight line along the arrangement direction of the valve hole 11 with the valve hole 11 and the main road 20 interposed therebetween. Are arranged side by side. The bypass switch circuit breaker 21 is a member that forms the bypass circuit B together with the disconnector 2 and the ground switch 3. On the side surface of the bypass switch circuit breaker 21, a lateral lead-out portion 21a that projects in the lateral direction is formed.

A main road 20 is provided between the bypass switch circuit breaker 21 and the valve hole 11 (electrically, the main circuit A).
It is connected by a plurality of connecting busbars 16 extending orthogonally to and a bypass circuit busbar 24. The bypass circuit bus 24 connects the connecting bus 16 and the bypass switch circuit breaker 21 via the connecting portion 18, and the main road 2
It extends along 0. Also, the bus 24 for the bypass circuit
Is a side outlet 21a of the bypass switch circuit breaker 21.
It is arranged horizontally with respect to. Furthermore, the connecting bus 16
2 from the connection point between the bus and the bypass circuit bus 14
A lead-out portion 26 extending orthogonally to 0 is connected. At the end of the lead-out portion 26, a communication circuit bus 2 for connecting the valve hole 11 (electrically the main circuit A) and the communication circuits C1 to C4 for connecting the DC reactor 6 to each other.
5 are arranged in parallel with and connected to the bypass circuit bus 24.

Further, the two DC reactors 6 connected to the ends of the connecting circuit bus 25 are arranged in the vicinity of the center of the drawing. When the DC reactors 6 are close to each other, the cable heads 7 are arranged in a concentrated manner.

[1-2] Operation and effect of the first embodiment In the first embodiment having the above-mentioned structure, the bypass circuit bus bar 24 is connected to the lateral lead-out portion 21a of the bypass switch breaker 21. By arranging horizontally,
The detachable bus bar 32 as shown in FIG. 11 is unnecessary. Therefore, the number of members can be reduced and the configuration can be simplified. Further, since the circuit breaker 21 can be removed in the horizontal direction, handling work such as removal and reattachment can be performed extremely easily. Furthermore, when mounting the insulating spacers on the circuit breaker 21, it is possible to arrange them vertically. Therefore, dust or the like is less likely to collect on the insulating spacer, and the stain resistance can be improved.

Further, since the DC reactor 6 and the cable head 7 are concentrated near the center of the device,
The installation area of the device can be reduced. Moreover, since the cable cave and the cable terminal processing unit can be gathered in one place, it is possible to easily perform the work such as foundation work and power cable routing. As a result, the construction cost is low and it is economically advantageous.

[2] Second Embodiment Next, a second embodiment including the present invention according to claim 2 will be described with reference to FIGS. 2 and 3. In the second embodiment, there is no lead-out portion 26 extending orthogonally to the main road 20 from the connection point between the connecting busbar 16 and the bypass circuit busbar 14, and the bypass circuit busbar 24 and the connecting circuit busbar 25 are arranged in two upper and lower stages. Are stacked. According to the second embodiment, the installation area can be reduced by the area surrounded by the connecting circuit bus bar 5 as compared with the conventional example.

[3] Third Embodiment A third embodiment including the present invention according to claim 3 is shown in FIGS. 4 and 5. In the third embodiment, the bypass circuit bus bar 24 and the connecting circuit bus bar 25 are connected to the collective pipeline bus bar 28.
It is stored inside. As a result, the tank forming the busbar and the insulating gas in the busbar are shared, and the busbar length can be shortened. As the collective pipeline bus 28, a conventionally widely used three-phase collective pipeline bus for alternating current is adopted, and if only the upper two phases of them are used, the interior of the pipeline that often accumulates below the normal busbar The structure can be strong against foreign matter. Further, as shown in FIG. 5, the direction of the lead-out portion 28a from the collective conduit busbar 28 can be arbitrarily selected, and the degree of freedom of layout can be increased.

[4] Fourth Embodiment Next, a fourth embodiment including the present invention according to claims 4 and 5 is shown in FIG. In the fourth embodiment, the connecting portions 29, 29 for connecting the DC reactor 6 and the connecting circuit busbar 25 are arranged on the side surfaces of the DC reactor 6 which are orthogonal to the main road 20 and are parallel to each other. Also the connection part 2
9, 29 are arranged on the same straight line along the main road 20. According to the fourth embodiment having such a connecting portion 29, the length dimension of the DC reactor 6 itself supplements the length of the connecting circuit bus bar 25 along the main road 20.
Therefore, the bus length of the bus for the communication circuit can be shortened as compared with the case where the connecting portion between the DC reactor 6 and the bus 25 for the communication circuit is arranged on the same side surface of the DC reactor 6.

Further, in the fourth embodiment, the connecting bus bar 1
A branch portion 33 extending from 6 to the connecting circuit bus 25
Is not located at the connection point between the connection busbar 16 and the bypass circuit busbar 24, but is arranged closer to the bypass switch circuit breaker 21 side. Therefore, it is possible to reduce the bus length in the branch portion 33. Such shortening of the bus bar can reduce the occupied area of the bus bar to reduce the installation area of the device and at the same time prevent the deterioration of the insulation performance due to the foreign metal particles.

[5] Fifth Embodiment Note that the present invention is not limited to the above embodiments, but includes other embodiments as shown in FIG. 7, for example. In this embodiment, a connecting bus 34 that connects the DC reactor 6 and the cable head 7 for the main line is arranged on the same straight line as the connecting portion 29 of the DC reactor 6.

According to such an embodiment, a busbar for adjusting the deviation between the connecting busbar 34 for connecting the cable head 7 for the main line and the connecting portion 29 of the DC reactor 6 becomes unnecessary, and the busbar length as a whole. Can be shortened. In FIG. 7, the two connecting portions 29 of the DC reactor are not on the same straight line, but they may be on the same straight line.

[0044]

As described above, according to the present invention, the busbar length can be shortened by improving the arrangement of the gas-insulated equipment, the handling can be facilitated, the installation area can be reduced, and the insulation performance can be improved. Also, it was possible to provide a gas-insulated switchgear that was excellent in terms of economy.

[Brief description of drawings]

FIG. 1 is a plan view of a gas insulated switchgear to which a first embodiment of the present invention is applied.

FIG. 2 is a plan view of a gas insulated switchgear to which a second embodiment of the present invention is applied.

FIG. 3 is a side view showing the position of a connecting circuit bus bar in the second embodiment of FIG. 2;

FIG. 4 is a plan view of a gas insulated switchgear to which a third embodiment of the present invention is applied.

5 is a cross-sectional view showing the inner conductor of the collective pipe bus bar and its outlet direction in the embodiment of FIG.

FIG. 6 is a plan view of a gas insulated switchgear to which a fourth embodiment of the present invention is applied.

FIG. 7 is a plan view of a gas-insulated switchgear to which another embodiment of the present invention is applied.

FIG. 8 is a single wire connection diagram of a general high voltage DC transmission system.

FIG. 9 is a plan view of a conventional gas-insulated switchgear.

FIG. 10 is a side view of a conventional gas-insulated switchgear.

FIG. 11 is a side view showing a peripheral configuration of a conventional circuit breaker for bypass switch.

[Explanation of symbols]

 1, 21 ... Bypass switch circuit breaker 2 ... Disconnector 3 ... Grounding switch 4 ... Bushing 5 ... Main valve 6 ... DC reactor 7 ... Cable head 8, 9, 18, 29 ... Connection part 11 ... Valve hole 14, 24 ... Bypass circuit busbars 15, 26 ... Communication circuit busbar 16 ... Connecting busbar 20 ... Main road 26 ... Drawing part 28 ... Collective line busbar 30 ... Insulating spacer 31 ... Substantially T-shaped connecting part 31 32 ... Detachable busbar 33 ... Branching unit A ... Main circuit B ... Bypass circuit C1, C2, C3, C4 ... Communication circuit

Claims (6)

[Claims] 1. A plurality of linearly arranged valve holes, a main circuit housed in each valve hole, a bypass circuit connected to the main circuit, and a connection between the main circuit and the bypass circuit. In the gas-insulated switchgear used in a power transmission and transformation substation of a DC power transmission system, which is provided with a communication circuit drawn from a point, the main circuit is provided with a main valve for AC / DC conversion, and the bypass circuit is provided. , A bypass switch circuit breaker having a lateral projecting portion protruding in the lateral direction is provided, a DC reactor is provided in the communication circuit, and between the main circuit and the bypass switch circuit breaker,
By a plurality of connecting busbars extending orthogonally to the arrangement direction of the valve hole, and a bypass circuit busbar connecting the connecting busbar and the bypass switch circuit breaker and extending along the arrangement direction of the valve hole. The bypass circuit bus bar is arranged horizontally with respect to the horizontal lead-out portion of the bypass switch circuit breaker, and between the connection point of the main circuit and the bypass circuit and the DC reactor is for the bypass circuit. A gas-insulated switchgear characterized by being connected by a bus for a communication circuit arranged parallel to the bus. 2. A plurality of the DC reactors are locally arranged in a concentrated manner, and a cable head portion serving as a connection portion with a power cable is arranged in a concentrated manner in the vicinity of the DC reactors. The gas-insulated switchgear according to claim 1. 3. The gas-insulated switchgear according to claim 1, wherein the bypass circuit bus bar and the communication circuit bus bar are arranged in a stacked manner. 4. The gas-insulated switchgear according to claim 1, 2 or 3, wherein the bypass circuit bus bar and the communication circuit bus bar are housed in a collective pipeline bus bar. 5. The DC reactor is arranged such that side surface portions parallel to each other are orthogonal to the arrangement direction of the valve hole, and for connecting the DC reactor and the communication circuit bus bar to each side surface portion. 5. The gas-insulated switchgear according to claim 1, 2, 3 or 4, characterized in that the connection part is arranged. 6. A branching portion extending from the main circuit to a bus for a communication circuit is disposed between a connection point between the main circuit and the bypass circuit and the bypass switch circuit breaker. The gas-insulated switchgear according to claim 1, 2, 3, 4 or 5.