JPH0588044B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a disconnection container using an insulating gas such as SF ₆ gas, which is constructed by arranging a current-carrying conductor parallel to the container axis. This relates to a three-phase all-in-one gas insulated switchgear.

[Technical background of the invention and its problems]

For substations or switchyards installed around large cities or coastal areas, the electrical equipment that makes up the substation or switchyard is sealed with an insulating medium such as SF ₆ gas due to difficulty in obtaining land or to prevent salt damage. Gas-insulated switchgear is used. This type of gas-insulated switchgear is becoming increasingly high-voltage and large-capacity as the demand for electricity increases in urban areas.
Further miniaturization, improved reliability, and simplified maintenance are required. Therefore, a three-phase gas-insulated switchgear in which three-phase current-carrying conductors are housed in one container has come to be adopted.

Generally, in three-phase gas-insulated switchgear, it is necessary to change the phase arrangement of current-carrying conductors inside the container in order to match the phase order between the main buses and between the main bus and external draw-out parts such as cable connections. come.

The general structure of such a three-phase integrated gas insulated switchgear will be explained with reference to the single line diagram in FIG. 3 and the sectional view in FIG. 4.

Figure 3 shows a single-line connection diagram for one circuit in a multi-bus system. Main buses BUS1 and BUS2 are equipped with disconnectors DS1 and DS2, respectively.
1. DS2 is connected to the breaker CB. This shiya disconnector CB is a current transformer CT for measuring instruments; a disconnector for railway lines
Line grounding device ES, instrument current transformer via DS3
Connected to PT and cable connection CH.

As a conventional three-phase all-in-one gas insulated switchgear using such a single line diagram, a configuration as shown in FIG. 4 is known. That is, the blade disconnector 1 is arranged perpendicularly to the installation surface, and the blade disconnector 1 is provided with an upper outlet terminal 2 and a lower outlet terminal 3 parallel to the installation surface. A T-shaped connection busbar 4 is connected to the lower outlet terminal 3, and main busbars 5 and 6, which are integrated with a disconnector, are provided below the connection busbar 4, and are electrically connected by an internal current-carrying conductor. connected. The upper outlet terminal 2 of the disconnector 1 is connected to the instrument current transformer 1 via the instrument current transformer 7, the disconnector 8, the grounding device 9, and the connection bus 10.
1 and a cable connection section 12 .

In this Figure 4, the phase order of each phase conductor a, b, c is shown by a broken line, but the phase order of the lead-out conductors of the upper lead terminal 2 and lower lead terminal 3 portions is different at the top and bottom. . In the three-phase gas-insulated switchgear with such a configuration, the main buses 5 and 6 are connected to the connection bus 4, so the main buses 5 and 6 are connected from the breaker 1 to the main buses 5 and 6.
It becomes necessary to twist the internal current-carrying conductor in the connection bus bar 4 that connects the two, which complicates the structure and contributes to increased costs. Furthermore, because the phase arrangement of the main buses 5, 6 and the connection bus 4 is different, the phase order confirmation work during and after assembly becomes complicated, and this makes it difficult to confirm the phase order during and after assembly. There are problems such as it takes a lot of time.

Also, the phase arrangement of devices connected to the other outlet 2 of the disconnector 1 is due to the configuration of the disconnector 8 and the grounding device 9. For example, if the disconnector 8 and the grounding device 9 are not installed laterally, the operating mechanism will not fit. Therefore, the phase arrangement must be different from the phase arrangement of the connection bus bar 4, and when looking at the entire gas-insulated switchgear, the phase arrangement and phase order become extremely complicated, and as mentioned above, the assembly work efficiency is reduced. There are also problems in that the structure becomes complicated, and it also leads to assembly defects.

[Purpose of the invention]

The present invention has been proposed to eliminate the above-mentioned drawbacks, and provides a three-phase integrated gas insulated switchgear that is simple in structure by eliminating the need for complex current-carrying conductors, is easy to assemble, and is inexpensive and highly reliable. The purpose is to

[Summary of the invention]

In order to achieve the above object, according to the present invention, the current-carrying conductor led out from one pole side of each phase break is branched into two parts within the shield breaker, and together with the current-carrying conductor on the other pole side, three In a three-phase integrated gas insulated switchgear using a disconnector configured with two lead terminals, the three lead terminals are arranged on the same side of the container, and current is supplied from each lead terminal. By making the phase arrangement of the conductors the same, complicated connection busbars can be eliminated, and
Since the phase arrangement of each device connected to this shield and disconnector is the same, it is possible to prevent operational errors during assembly, and it is also easy to confirm the phase order after assembly.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention in the single line diagram of FIG. 3 will be specifically described based on FIGS. 1 and 2.

In this embodiment, the shingle breaker CB is arranged so that the axis of the container 21 filled with insulating gas is perpendicular to the installation surface. Inside the shield breaker container 21, each phase shield section 23 having a fixed side and a movable side electrode that can be brought into and out of contact with each other is arranged so that its operating axis is parallel to the axis of the shield breaker container 21. are placed in each. The first energizing conductor 24 of each phase is led out from the lower terminal of the breaker section 23 , and the second energizing conductor 25 is branched upward inside the breaker container 21 . It is led out from a first output terminal 27 provided at the lower side of the . A second current-carrying conductor 25 branched upward from the first current-carrying conductor 24 of each phase is connected to a disconnection vessel 2 for each phase.
1 and is led out from a second outlet terminal 28 provided above the first outlet terminal 27 on the side surface of the shatter breaker container 21 . Main busbars 30 and 31, which are integrated with a disconnector, are connected to the first and second lead terminals 27 and 28, respectively. The third current-carrying conductor 26 of each phase is led out from the upper terminal of the shield breaker 23
A third outlet provided above the second outlet terminal 28 on the side surface of the edge breaker container 21 is connected to the third outlet terminal 28 on the side surface of the edge breaker container 21 via an instrument current transformer 32 disposed above the edge breaker 23 in each phase. It is led out from the terminal 29.

The outlet terminal 29 is equipped with a disconnector 40 and a grounding device 41.
is connected, and further connected to a cable connection portion 42 and an instrument transformer 43.

Here, the broken lines in Figures 1 and 2 indicate a,
This is written for convenience to show the order of the b and c phases, and 3
The internal conductor arrays of the devices connected to each of the four outlet portions 27, 28, and 29 are all the same as indicated by a, b, and c from the top in the figure. The internal conductor phase arrangement of the cable connection part 42 is also the same as that of the outlet part side.

In this way, by making all the exit directions from the breaker container 21 the same and making the internal conductor phase arrangement of the devices connected to it the same, the phase order becomes extremely simple and clear, and as shown in FIG. There is no need for a complicated phase twisting structure within the connection bus bar 4 as in the conventional embodiment shown, and it is possible to achieve significant improvements such as simplification of structure and ease of assembly and disassembly, and the gas insulated switchgear It becomes possible to reduce the cost of

Further, the main busbars 30 and 31 are connected to the main busbars 30 and 31 by a second current-carrying conductor 25 disposed inside the main busbar 21 in parallel with the axis of the container 21. Since there is no external connection bus bar 4 and the layout is efficient, the installation volume of the gas insulated switchgear can be greatly reduced, making it an extremely superior gas insulated switchgear that meets the trend of rising land prices in recent years. can be provided.

In this way, by making the gas insulated switchgear have the same phase arrangement when viewed from the side or from the plane, it is possible to simplify the phase arrangement and improve the efficiency of the three-phase all-in-one type gas insulated switchgear. It is possible to improve the disassembly and assembly workability.

〔Effect of the invention〕

As shown above, according to the present invention, the second current-carrying conductor in the shingle breaker container is formed with a portion parallel to the container axis that faces the shingle cut portion, and By setting all three lead-out directions in the same direction and by making the internal conductor phase arrangement of the devices connected to these lead-out parts the same, the phase order is extremely simple and clear, the internal structure is simple, and it is easy to disassemble. It is possible to provide an excellent three-phase integrated gas insulated switchgear that is easy to assemble and requires a small installation volume.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a single line diagram to which the present invention is applied, and FIG. 4 is a conventional FIG. 1 is a configuration diagram showing this type of device. CB...Shiya disconnector, 21...Shiya disconnector container, 2
3...Shrink section, 24, 25, 26... Current-carrying conductor, 27, 28, 29... Output terminal, 30, 3
1... Main bus bar, 40... Disconnector, 41... Grounding device, 42... Cable connection section.

Claims (1)

[Scope of Claims] 1. Each phase shield and disconnection section having a fixed side and a movable side electrode that can be moved toward and away from each other are housed in a phase disconnection container filled with an insulating gas, A second current-carrying conductor of each phase is branched from a first current-carrying conductor of each phase led out from one end of the cut-off portion in the container, and the first and second current-carrying conductors of each phase are connected to the side surface of the container. The main bus bar is connected to the first and second outlet terminal portions through a disconnector, respectively, and the first and second outlet terminal portions are respectively connected to
The third portion of each phase derived from the other end of each phase or section
The current-carrying conductor is led out from a third outlet terminal provided on the side surface of the container, and an external lead-out terminal such as a cable connection part is connected to the third outlet terminal through a disconnector, grounding device, etc. In the three-phase collective gas insulated switchgear to be connected, the second current-carrying conductor has a parallel part to the container axis opposite to the shingle break part, and the first, second,
The third outlet terminal portion is arranged on the same side of the container, and the first, second and third terminals are parallel to the container axis.
A three-phase all-in-one gas insulated switchgear characterized in that the phase arrangement of current-carrying conductors of each phase led out from each lead terminal part in the cross section of the third lead terminal part is the same phase arrangement. 2. In the same container as the sheath section and the sheath section,
The three-phase gas-insulated switchgear according to claim 1, wherein the current-carrying conductors and the cable connection portions arranged in the axial direction are arranged in the same phase arrangement direction.