KR20000005956A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: A gas valving system is provided to make a variable structure of valving system with no change of the base unit structure. CONSTITUTION: In the gas valving system, at the both side of box of the first, second and third cut off (CB1¯CB3) lie six shutters, each cut off is linearly connected by way of shutter and connection line(12,13). One side of each cut off is connected to the main line(BUS1,BUS2), separated line(14,24) come from the boxes between first and second cut off and between second and third cut off. Bushing of the boxes connected with the front of the separated lines so as to make a unit. The first, second and third cut off of the box are arrayed so that the linking line for the first, second and third actually forms a straight line is between and parallel to the axial line of the main line and the line linking the center of the bushing of each box.

Description

Gas Insulated Switchgear {GAS INSULATED SWITCHGEAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear containing a high voltage charging unit in a container filled with an insulated gas, and more particularly, to a gas insulated switchgear configured by connecting three breakers to a main bus bar.

In general, the gas insulated switchgear is configured by charging a SF ₆ gas or the like and storing high voltage charging parts such as a circuit breaker, a disconnecting device, and a bus in a metal container having a ground potential. For this reason, since the safety and reliability are high, and the installation area is greatly reduced, in recent years, the gas insulated switchgear is used in various places.

By the way, in an important system, the 1 / 1/2 CB type switchgear as shown in the circuit diagram of FIG. 1 is adopted. In the configuration of one circuit (line I) of the switchgear, three circuit breakers CB1, CB2 and CB3 are electrically connected in series between the main buses BUS1 and BUS2. Disconnectors DSll and DSl2, disconnectors DS21 and DS22, and disconnectors DS31 and DS32 are connected to both sides of each breaker, respectively. Branch busbars (14, 24) are derived between the disconnector DS12 and the disconnector DS21, and between the disconnector DS22 and the disconnector DS31. A bushing Bg is attached to the tip of each branch bus bar 14 and 24. Also, the configuration of the line II in Fig. 1 is the same as the line I.

An example of the conventional gas insulated switchgear based on such a circuit diagram is demonstrated below with reference to FIG. 3 is a plan view, and is shown by the phase separation type which is used in many grades with a high voltage rating.

As shown in Fig. 3, the main buses BUS1 and BUS2 are arranged substantially in parallel, and three breakers CB1, CB2 and CB3 are arranged in a straight line perpendicular to the axial direction of the main bus. . 4 is a cross-sectional view of the circuit I of FIG. First, disconnectors DS11 and DS12 are provided on transverse breaker CBl via current transformers CT1 and CT2. In addition, although not shown, the grounding switch is normally built in the disconnectors DS11 and DS12. The breakers CB2 and CB3 also have a configuration in which disconnectors DS21 and DS22 and disconnectors DS31 and DS32 are provided in almost the same manner as the breakers CB1.

The disconnectors DS11 and DS32 are connected to the main buses BUS1 and BUS2, respectively. Disconnectors DS12 and DS31 are connected to disconnectors DS21 and DS22 attached to breaker CB2 via connecting buses 13 and 23. Branch buses 14 and 24 are derived from the connection buses 13 and 23, and bushings Bg1 and Bg2 are connected to the ends thereof.

By the way, as the arrangement of the gas insulated switchgear as described above, when the number of lines is blown, the dimension A in the line direction shown in Fig. 3 increases. In addition, even if the number of lines is small, a large installation area of square shape is required. In particular, in the case of installation in a building, a large space such as a gymnasium is required, which is a problem in terms of building cost and effective use of land.

This is because, in the case of the 1,1 / 2 CB system, three circuit breakers are side-by-side in series, which inevitably lengthens the dimension B between busbars. Moreover, in order to ensure the air insulation distance of bushings Bgl-Bg4, the dimension A of the line direction also needed to be lengthened. For example, in a gas insulated switchgear of a voltage class of 500 kV, the B dimension generally becomes 20-30 m, and the C dimension which is a bushing line pitch generally requires 25-30 m. Since the C dimension is a configuration factor having a large A dimension, in the second to third lines, the A dimension and the B dimension become substantially the same, and as described above, a large installation area close to a square is required.

If such an installation area is restricted, it becomes difficult to install a large-scale gas insulated switchgear in a long space such as a dam. Further, even if the dimension A in the line direction is further reduced, if the branch buses 34 and 44 are located on the breakers CB1 to CB3, it may cause problems such as hanging up of the breakers CB1 to CB3 during inspection. do. Since the line pitch C dimension of the bushing requires a constant dimension determined by the air insulation distance as described above, there is a limit to the reduction in the A dimension.

In order to cope with this, various arrangements are conventionally devised. For example, there are some proposed in Japanese Patent Laid-Open Nos. 59-106808 and 61-92106. All of them focus on miniaturization and checkability of the gas insulated switchgear, but in the case of having a plurality of bushings, it is necessary to considerably lengthen the branch bus bar to secure the air insulation distance. That is, although the reduction of the gas insulation switchgear was largely achieved by employing the high insulation gas, the problem remains that the branch bus bar having the air bushing is relatively longer.

Moreover, in order to reduce the dimension B between busbars which connected three breakers in series, the arrangement structure which does not simply line three breakers linearly in parallel but also makes a zigzag arrangement is also proposed. For example, in the arrangement proposed in the above-mentioned Japanese Patent Application Laid-Open No. 61-92106, the circuit breakers CB1, CB2, and CB3 in the first phase are adjacent to each other, and are arranged in the direction perpendicular to the bus bar, and the second phase and the first phase are similarly arranged. The third phase is sequentially arranged in the bus bar axial direction, and the overall B dimension is reduced compared to the straight line arrangement. In general, however, in the disconnector and the ground switch, many of the three phases are mechanically connected and opened by one operation device. In the above arrangement, the distance between the phases is greatly reduced, making it difficult to connect mechanically. For this reason, it is necessary to provide expensive operation apparatus for each phase, and there existed a problem in economy.

As an example of a circuit configuration other than that shown in FIG. 1, there is a switchgear of the circuit diagram shown in FIG. This is an example of alternate branch withdrawal as a means of reporting for algae stabilization of substations. 5 and 6 show examples of the gas insulated switchgear according to this circuit diagram. 5 is a plan view and FIG. 6 is a cross-sectional view of the circuit II of FIG. According to this arrangement, the branch buses 34 and 44 are longer than the branch buses 14 and 24, as is apparent from FIG. In addition, the maximum line width A1 is longer than the A dimension in FIG. 3 and requires a larger installation area.

Accordingly, it is an object of the present invention to provide a gas insulated switchgear which can be installed in a random response in various installation spaces without changing the basic unit.

Another object of the present invention is to provide a gas insulated switchgear capable of forming a busbar length at the shortest distance while maintaining an air insulation distance such as a bushing.

Still another object of the present invention is to provide a gas insulated switchgear having excellent operability during maintenance and inspection.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing a forward branch drawing out of a 1 / 2-CB system switchgear.

Fig. 2 is a circuit diagram of alternately branching out a switching device of a 1/2 CB system;

3 is a plan view showing an example of a conventional gas insulated switchgear.

Fig. 4 is a sectional view of the line I in Fig. 3;

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

Fig. 6 is a sectional view of the line II in Fig. 5;

7 is a plan view of a gas insulated switchgear showing a first embodiment of the present invention;

8 is a front view of the gas insulated switchgear of FIG.

Fig. 9 is a side view in the Y direction of Fig. 8 showing the second embodiment of the present invention.

FIG. 10 is a detailed view of portion X in FIG. 7 showing a third embodiment of the present invention; FIG.

Fig. 11 is a plan view of a gas insulated switchgear showing a fourth embodiment of the present invention.

12 is a plan view of a gas insulated switchgear showing a fifth embodiment of the present invention.

Fig. 13 is a plan view of a gas insulated switchgear showing a sixth embodiment of the present invention.

According to the present invention, the disconnectors are connected to both sides of each phase of the first, second, and third breakers, and each phase of the first, second, and third breakers is connected to the disconnectors and the connecting busbars. Electrically connected in series, one end of each phase of the first and third breakers is connected to the main busbar, and a branch bus for each phase from the first breaker and the second breaker and between the second breaker and the third breaker In the gas insulated switchgear, in which a plurality of sets of units constituted by connecting bushings to each phase of the branch bus bar are connected to each other, the first, second and third breakers of each phase connect an axis line connecting the main axis thereof. These lines are arranged to be substantially the same straight line, and the line connecting the axis of the main bus bar and the center of the bushing of each phase is parallel to the axes of the first, second and third breakers, and also the first and second. And thermal of the third breaker There is provided a gas insulated switchgear arranged at both outer positions of the.

According to this structure, since the dimension of the direction orthogonal to the axis | shaft of a main bus bar can be made into the width | variety of one breaker, it can be reduced to about l / 3 of the prior art which requires three breakers.

In the gas insulated switchgear, the first, second and third breakers of each unit are arranged at equal intervals, and the air insulation distance of the corresponding bushings between adjacent units is substantially equal to three times the respective breaker intervals. It may be comprised so that it may be.

According to this structure, if a branch bus is pulled out from a breaker shaft for every three breakers, it can connect to a bushing with a short branch bus.

In the gas insulated switchgear, the branch bus bar may be drawn at right angles to the axis of the breaker from a connection bus between the first and second breakers and between the second and third breakers.

According to this structure, each branch bus bar becomes the same shape, common bus bar and common ground work are made, and it can be set as rational arrangement.

In the gas insulated switchgear, the main bus bar is a first main bus bar and a second main bus bar which are parallel to each other, and heat of the first, second and third breakers is separated between the first main bus bar and the second main bus bar. It may be arranged in parallel, and either one of the distances from the center of the intermediate phase of the said 1st, 2nd and 3rd breakers to the said 1st main busbar and the said 2nd main busbar may be wider than the other.

According to this structure, since either one of the distance between a 1st main bus bar, a 2nd main bus bar, and a circuit breaker is wide, a main bus bar is not obstructed at the time of maintenance and inspection of a breaker and a disconnector.

In the gas insulated switchgear, at least one operation means of a circuit breaker and a disconnector may be arranged on the main bus side with the wide distance.

According to this structure, since the operation means is arrange | positioned in a large space, the operability at the time of maintenance and inspection of a breaker and a disconnector improves.

In the gas insulated switchgear, the main bus bar is a first main bus bar and a second main bus bar which are parallel to each other, and heat of the first, second and third breakers is separated between the first main bus bar and the second main bus bar. Disposed in parallel, one end of the first breaker in the odd-numbered unit is connected to the first main busbar, one end of the third breaker is connected to the second main busbar, and one end of the first breaker in the even-numbered unit It may be connected to the 2 main busbars, and one end of a 3rd breaker may be connected to the 1st main busbar.

According to this structure, even in the case of an alternating branch drawing circuit, the dimension of the direction orthogonal to the axis of a main bus bar can be reduced.

In the gas insulated switchgear, the unit is two sets, one end of the first breaker in the first unit is connected to the main bus, and one end of the third breaker in the first unit is the first breaker in the second unit. One end of the third breaker in the second unit may be connected to the main bus.

According to this configuration, since the second main bus can be omitted, it is very economical and the installation space can be further reduced.

In the gas insulated switchgear, at least two sets of units may be arranged in parallel with each other at a position adjacent to each other.

According to this configuration, when there is a limit in the installation space in the axial direction of the main bus bar and there is room in the dimension in the direction orthogonal to the axis of the main bus bar, by arranging any one unit in parallel, the degree of freedom of arrangement is increased, According to the installation space, an appropriate arrangement can be made, and the space can be effectively used.

Example

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]

First, the first embodiment will be described below with reference to Figs. 7 is a plan view of this embodiment, FIG. 8 is a cross sectional view of FIG. 7, and the same reference numerals are given to components common to FIG.

As shown in Fig. 7, three circuit breakers CB1, CB2, and CB3 electrically connected in series are arranged on the same axis. On both sides of the breakers CB1, CB2, and CB3, as shown in Fig. 8, the disconnectors DSll and DS12, the disconnectors DS21 and DS22, and the disconnectors DS31 and DS32 are provided through the current transformers CT1 and CT2, respectively. It is. The disconnector DS11 is connected to the main bus BUS1 via the connection bus 12, and the disconnector DS12 is connected to the disconnector DS21 via the connection bus 13. The disconnector DS32 is connected to the main bus BUS2 via the connection bus 25, and the disconnector DS22 is connected to the disconnector DS31 via the connection bus 23.

A branch bus 14 is connected to the bushing Bgl across the main bus BUS1 in a direction orthogonal to the axes of the breakers CB1, CB2, and CB3 from almost the center of the connection bus 13. A branch bus 24 is led to the main bus BUS2 side in a direction orthogonal to the axes of the breakers CB1, CB2, and CB3 from an almost center of the connecting bus 23, and is connected to the bushing Bg2. Branch busbars 14 and 24 are symmetrical around the rows of breakers CB1 to CB3.

The main buses BUS1 and BUS2 are arranged in such a manner as to sandwich the breakers CB1 to CB3 and in parallel with this row. Further, the rows of the bushings Bg1 and Bg2 are arranged in parallel with the rows of the breakers CB1 to CB3 outside the main buses BUSl and BUS2. For this reason, the line width B1 becomes the dimension which added the width | variety of the main bus line to the width | variety of one breaker, and when line length D is two lines, it is about twice the B dimension of the conventional example shown in FIG.

Further, in the extending line directions of the circuit breaker row, the main bus axis, and the bushing row of the circuit I, a 1/2 CB unit of the circuit II is arranged similarly to the circuit I. In addition, although two line segments are shown in FIG. 7 and FIG. 8, the case where three or more lines are extended is extended in each extension line direction. In addition, the bushing of circuit I (Bg1) and the bushing of circuit II (Bg3), the bushing of circuit I (Bg2), and the bushing of circuit II (Bg4) are each fixed line pitch determined by the air insulation distance, as shown in FIG. It is arranged in C dimension. The breakers CB1 to CB3 are arranged in the same pitch P dimension as shown in FIG. This P dimension is about 1/3 of the bushing line pitch C.

Effects of the present embodiment as described above are as follows.

Since the distance B1 between the main buses can be set to about l / 3 compared to the B dimension in the related art shown in Fig. 3, the installation space can be reduced, and in particular, a large gas insulated switchgear for a long space such as a dam dam Easy to install

In addition, since the positions of the branch buses 14, 24, 34, 44 for connecting to the bushings Bg1, Bg2, Bg3, and Bg4 are derived for every three breakers, the line pitches C of the bushings coincide. For this reason, the length of branch buses 14, 24, 34, 44 can be made into the shortest. In addition, since the shape of the branch buses 14, 24, 34, 44 can be unified, it is possible to make the bus bar common and the base work supporting the bus bar to be common.

Second Embodiment

Next, a second embodiment will be described with reference to FIG. The basic configuration of this embodiment is the same as that of the first embodiment shown in Figs. 7 and 8, and Fig. 9 is a side view seen from the Y-direction of Fig. 8.

As shown in Fig. 9, the main buses BUS1 and BUS2 are arranged triangularly in the vertical direction opposite to each other. The heights of the main buses BUS1 and BUS2 substantially coincide with the height H of the tops of the breakers CBla to CBlc of each phase. In addition, compared with the distance Ll from the center of the breakers CBla to CBlc to the main bus BUS1, the distance L2 to the main bus BUS2 has a size wide enough for a person to walk. On the main bus line BUS2 side, the front of a breaker operation mechanism (not shown) and the operation box 110 side of a disconnector are unifiedly arrange | positioned.

Effects of the present embodiment having the above configuration are as follows.

Since the circuit breaker operation mechanism and the operation box 110 side of the disconnector are uniformly arranged on the main bus BUS2 side that is wide enough to be walked by a person, the operability at the time of maintenance and inspection of the breaker, disconnector is excellent.

In addition, since the main buses BUS1 and BUS2 are arranged in three directions in the vertical direction, the joining of the main buses 12 and 25 and the main buses BUSl and BUS2 shown in Fig. 7 becomes easy.

Third Embodiment

Next, a third embodiment will be described below with reference to FIG. The basic configuration of this embodiment is the same as that of the first embodiment shown in Figs. 7 and 8, and Fig. 10 is a plan view of the disconnecting device in which the X part of Fig. 7 is enlarged.

As shown in Fig. 10, the first phase DS31a, the second phase DS31b, and the third phase DS31c of the disconnecting device are disposed adjacent to each other, and mechanically the three phase portions are opened and closed by one operation device. The link mechanism 311 communicates with each other. Similarly, the first phase DS32a, the second phase DS32b, and the third phase DS32c of the disconnectors disposed adjacent to each other are mechanically linked to the three phases by the link mechanism 321 so as to be opened and closed by one operation device. I'm in contact.

According to the present embodiment as described above, the same operation and effect as in the first embodiment can be obtained, and the three-phase portion of the disconnecting device can be operated by one operation device, thereby providing a device having excellent operability and economic efficiency and high reliability. Can be.

[Example 4]

Next, a fourth embodiment will be described below with reference to FIG. In addition, although this basic structure is the same as that of the 1st Example shown in FIG.7 and FIG.8, this embodiment differs in that it is set as the gas insulation switchgear corresponding to the alternate branch drawing circuit shown in FIG. FIG. 11 is a plan view, and like reference numerals denote components that are common to FIG.

As shown in Fig. 11, the disconnector DS11 attached to the circuit breaker CB1 of the circuit II is connected to the main bus BUS2 via the connection bus 25, and the disconnector (installed in the circuit II breaker CB3) DS32 (see FIG. 2) is connected to the main bus BUS1 via the connecting bus 35.

Effects of the present embodiment as described above are as follows.

In this embodiment, the forward branch drawing method and the arrangement arrangement can be made substantially the same as the alternate branch drawing method, and since the line dimension A1 shown in FIG. 5 does not increase, the branch bus can be shortened.

[Example 5]

Next, a fifth embodiment will be described below with reference to FIG. In this embodiment, the number of lines is only two, and the disconnector DS32 attached to the circuit breaker CB3 of the circuit I and the disconnector DS11 attached to the circuit breaker CB1 of the circuit II are directly connected by the bus line 26. have. The main bus BUS2 is omitted. The other configuration of this embodiment is the same as that of the fourth embodiment shown in FIG.

According to this embodiment as described above, since the main bus BUS2 can be omitted, it is very economical and the installation space can be further reduced.

[Example 6]

Next, a sixth embodiment will be described below with reference to FIG.

Line I and line II of the present embodiment have the same structure as that of the first embodiment shown in FIG. The circuit III is arranged in parallel with the circuit I and adjacent to each other, and the connection bus line 12 connecting the disconnector DS11 and the main bus BUS1 attached to the circuit breaker CB1 of the circuit I is connected to the circuit III. It extends to the side and is connected to the disconnector DS11 attached to the circuit breaker CB1 of the circuit III. In addition, the disconnecting circuit DS32 attached to the circuit breaker CB3 of the circuit I and the connecting bus 25 connecting the main bus BUS2 extend to the circuit III side and the disconnecting circuit DS32 attached to the circuit breaker CB3 of the circuit III. ) Although Fig. 13 shows three lines, the four lines may be provided on an extension line of line III and in a neighborhood of line II.

Effects of the present embodiment as described above are as follows.

By suitably pairing the serial and parallel lines, the arrangement can be made corresponding to various installation spaces. For example, as long as D dimension and B3 dimension in FIG. 13, up to four lines can be provided. In addition, the total extension lengths of the main buses BUS1 and BUS2 can also be shortened by about D dimension than the configuration of FIG.

Other Examples

The present invention is not limited to the above embodiments, and the following embodiments can also be configured. That is, in the third embodiment, although not shown in Fig. 10, the disconnecting device is usually provided with a built-in mounting switch, and it is also possible to open and close by mechanically linking with a disconnecting device.

Also, in the fourth embodiment, Fig. 11 shows only two lines, but in the case of the third and fourth lines, the main bus lines BUSl and BUS2 are the same as the line I on the third line and the line II on the fourth line. It is assumed to be connected to).

In the sixth embodiment, although the cable head CH is provided at the tip of the branch bus bar and connected to the power cable, the bushing connection can be made as shown in FIG.

As described above, according to the present invention, it is possible to provide a gas insulated switchgear capable of responding on a temporary basis to various installation spaces without changing the basic unit.

Claims (8)

Disconnectors DSll, DS12 to DS31, and DS32 are connected to both sides of each phase of the first, second, and third breakers CB1 to CB3, and between each phase of the first, second, and third breakers. Silver is electrically connected in series via the disconnector and the connecting buses 13 and 23, one end of each phase of the first and third breakers is connected to the main buses BUS1 and BUS2, and the first breaker and the second breaker Branch buses 14 and 24 are drawn out for each phase from between the main breaker and the second breaker and the third breaker, and a plurality of sets of l units configured by connecting bushings Bg1 and Bg2 for each phase to the ends of the branch buses. In the gas insulated switchgear installed in the tank (I, II, ..), The first, second and third breakers CB1 to CB3 of each phase are arranged such that the axes connecting the main axes thereof are substantially the same straight line, Lines connecting the axes of the main bus lines BUS1 and BUS2 and the centers of the bushings Bg1 and Bg2 in each phase are parallel to the axes of the first, second and third breakers, and also the first and second. And gas insulated switchgear arranged at both outer positions of the row of the third circuit breaker. The method of claim 1, The first, second and third breakers CB1 to CB3 of each unit are arranged at equal intervals, and the air insulation distance of the corresponding bushings Bg1 and Bg2 between adjacent units is substantially three times the respective breaker intervals. Gas insulated switchgear, characterized in that configured to be as. The method according to claim 1 or 2, And said branch bus bar (14,24) is drawn at right angles to the axis of said breaker from a connecting bus between said first and second breakers and between said second and third breakers. The method according to any one of claims 1 to 4, The main buses BUS1 and BUS2 may be the first main bus BUS1 and the second main bus BUS2 parallel to each other, and the first, second and third main buses may be separated between the first main bus and the second main bus. The rows of circuit breakers are arranged in parallel, and one of the distances from the first main bus bar to the second main bus bar is wider than the other from the center of the intermediate phase of the first, second and third breakers. Gas insulation switchgear. The method of claim 4, wherein At least one operation means (110) of a circuit breaker and a disconnector is arranged on the main bus (BUS2) side with a wide distance. The method according to any one of claims 1 to 5, The main buses BUS1 and BUS2 may be the first main bus BUS1 and the second main bus BUS2 parallel to each other, and the first, second and third main buses may be separated between the first main bus and the second main bus. The rows of breakers are arranged in parallel, one end of the first breaker in the odd unit is connected to the first main busbar and one end of the third breaker is connected to the second main busbar, One end is connected to the second main busbar, and one end of the third breaker is connected to the first main busbar. The method according to any one of claims 1 to 5, The unit is two sets (I, II), one end of the first breaker of the first unit (I) is connected to the main busbar, and one end of the third breaker in the first unit is the second unit (II). And one end of the third circuit breaker is connected to the main bus line in the second unit. The method according to any one of claims 1 to 7, A gas insulated switchgear, characterized in that at least two units (I, II) are arranged in parallel to each other in a position adjacent to each other.