JPH0564004B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a bus bar and an insulating medium in a closed container.
The present invention relates to a three-phase integrated gas insulated switchgear housing a disconnector, circuit breaker, etc., and particularly relates to a gas insulated switchgear with an improved support structure for a current-carrying conductor.

[Technical Background of the Invention] In substations or switchyards installed around large cities or coastal areas, the electrical equipment constituting the substation or switchyard must be converted to SF6 due to difficulty in obtaining land or to prevent salt damage. A gas-insulated switchgear sealed with an insulating medium such as gas that has excellent insulation and arc-extinguishing properties is used. In this type of gas-insulated switchgear, circuit breakers, disconnectors, and other necessary equipment are arranged three-dimensionally, reducing the distance between each piece of equipment, thereby significantly reducing the site area. It can be configured to be significantly smaller than an air-insulated type switchgear. In addition, in recent years, there has been an increasing trend of construction inside buildings and basements in large cities, considering the need to harmonize with nature and the residential environment. Therefore, there is a need to reduce the construction cost including the gas insulated switchgear by arranging the components rationally and reducing the installation area or volume to the minimum. Therefore, three-phase gas-insulated switchgear, in which three-phase current-carrying conductors are housed in one container, has come to be adopted.

The general structure of such a three-phase all-in-one gas insulated switchgear will be explained with reference to a single line diagram in FIG. 3 and a sectional view in FIG. 4. In other words, Figure 3 shows a single-line connection diagram for one line in a multi-bus system.
BUS1 and SUB2 have disconnectors DS1 and
DS2 is arranged, and the disconnectors DS1 and DS2 are connected to the circuit breaker CB. Additionally, circuit breaker CB
is connected to the line installation device ES, the voltage transformer PT, and the cable connection part CH via the voltage transformer CT and the line disconnector DS3.

As a conventional three-phase integrated gas insulated switchgear based on such a single line diagram, a configuration as shown in FIG. 4 is known. That is, the circuit breaker 1 is disposed perpendicularly to the installation surface, and 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 7 and 8, which are integrated with disconnectors 5 and 6, are provided below the connection busbar 4, respectively. Electrically connected by a current-carrying conductor. Further, a voltage transformer 13 and a cable connecting portion 14 are connected to the upper outlet terminal 2 of the circuit breaker 1 via a voltage transformer 9 , a disconnector 10 , a grounding device 11 , and a connection bus 12 .

However, in the conventional three-phase all-in-one gas insulated switchgear configured in this way, in order to match the phase order between the main buses and between the main buses and external lead-out parts such as cable connections, The phase arrangement needs to be changed inside the container. That is, circuit breaker 1
Since the current-carrying conductor led out from the lower outlet terminal 3 is connected to the main busbars 7 and 8 via the connection busbar 4, it is necessary to twist the internal current-carrying conductor within the connection busbar 4. has become complicated, contributing to high costs. Furthermore, because the phase arrangement of the main buses 7 and 8 and the phase arrangement of the connection bus 4 are different, the work of confirming the phase order during and after assembly becomes extremely complicated, making it difficult to perform work when self-generating or when adding lines. There were drawbacks such as the need for a lot of time. In addition, the phase arrangement of the equipment connected to the upper outlet terminal 2 of the circuit breaker 1 is as follows:
In order to accommodate the operating mechanisms of the disconnector 10 and the grounding device 11, the disconnector 10 and the grounding device 11 must be arranged laterally, so the phase arrangement must be different from that of the connection bus 4, and the overall phase arrangement must be different from that of the connection bus 4. The arrangement and phase order become extremely complicated, and assembly work efficiency is significantly reduced.
The structure became complicated and there were problems with assembly defects.

In order to solve these problems, a gas insulated switchgear having a configuration as shown in FIGS. 5 and 6 has been developed.

That is, the circuit breaker 20 is arranged so that the axis of the container 21 filled with insulating gas is perpendicular to the installation surface. Inside the container 21, the blocking portions 22 of each phase, each having a fixed side electrode and a movable side electrode that can be moved into and out of contact with each other, are arranged such that their operating axes and the axis of the container 21 are parallel to each other. The circuit breaker conductors 23 of each phase led out from the lower terminal of the interrupter 22 branch upward from the current-carrying conductor 24 inside the container 21, and then connect to the first lead terminal 25 provided at the lower side of the container 21. It is derived from Further, the current-carrying conductor 24 branched upward from the circuit breaker conductor 23 is arranged parallel to the axis of the container 21 for each phase, and is connected to a second lead terminal provided above the first lead terminal 25 on the side surface of the container 21. It is led out from the terminal 26. These first and second lead terminals 25, 2
6 are connected to main busbars 29 and 30, which are integrated with disconnectors 27 and 28, respectively.

On the other hand, the circuit breaker conductors 31 of each phase led out from the upper terminal of the interrupting section 22 are connected to the interrupting section 2 inside the container 21.
The current is led out from a third outlet terminal 33 provided above the second outlet terminal 26 on the side surface of the container 21 via an instrument current transformer 32 arranged above each phase of the container 21 . A cable connecting portion 36 and a voltage transformer 37 are connected to this third outlet terminal 33 via a disconnector 34 and a grounding device 35 . In the gas insulated switchgear shown in FIG. 5, the phase arrangement of the current-carrying conductors inside the devices connected to each of the openings 25, 26, and 33 is all the same.

In the gas insulated switchgear configured in this way, the direction of exit from the container 21 is all the same, and the phase arrangement of the current-carrying conductors inside the equipment connected to it is the same, so that the phase order is extremely accurate. In addition to being simple and clear, there is no need for a complicated pair of twists in the connecting busbar 4 as in the conventional example shown in Figure 4, which simplifies the structure and greatly improves the workability of assembly and disassembly. , it becomes possible to reduce the cost of gas-insulated switchgear.

[Problems with Background Art] However, although the gas insulated switchgear having the configuration shown in FIG. 5 has the above-mentioned advantages, it also has the following problems. That is, the current-carrying conductor 24 arranged parallel to the axis of the circuit breaker 21
As shown in FIG. 7, the finger portions 40a and 40b provided at both ends are the contact 41 disposed on the circuit breaker conductor 23 and the contact disposed on the second lead terminal 26, respectively. The middle part of the current-carrying conductor 24 is connected to the conductor 2.
4 is as long as the entire length of the blocking portion, but is not supported in any way. In this way, since the support structure of the current-carrying conductor 24 is not perfect, when a current of tens of thousands of A flows through the current-carrying conductor 24 for a short time, a large repulsive force acts on the current-carrying conductor 24 due to electromagnetic force.
The current-carrying conductor 24 may vibrate or become distorted excessively. Further, when connecting the main bus bar 30 and the current-carrying conductor 24 at the second lead terminal 26, a horizontal load is applied to the current-carrying conductor 24, but this must be supported by one end on the lower end side of the current-carrying conductor 24. In some cases, the current-carrying conductor 24 becomes distorted and cannot be connected to the main bus bar 30.

[Object of the Invention] The present invention was proposed in order to eliminate the drawbacks of the conventional gas insulated switchgear as described above. The objective is to provide a highly reliable gas insulated switchgear by improving the structure.

[Summary of the Invention] The gas-insulated switchgear of the present invention has a current-carrying conductor for each phase branched from a circuit breaker conductor for each phase, arranged parallel to the axis of the container, and a lower part of the current-carrying conductor for each phase branching from a circuit breaker conductor for each phase. The structure is characterized in that it is supported by a circuit breaker conductor located below the container, and the upper part is supported by a support insulator provided in the container. With such a configuration, vibration of the current-carrying conductor can be prevented and distortion can be prevented.

[Embodiment of the Invention] An embodiment of the present invention will be specifically described below with reference to FIG. Note that the same parts as those of the conventional type shown in FIGS. 3 to 7 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the current-carrying conductor 24 branched upward from the circuit breaker conductor 23 is arranged parallel to the axis of the container 21 for each phase. A connection conductor 50 that branches the current-carrying conductor 24 in the horizontal direction is provided from the vicinity of the second lead-out terminal portion 26 of the current-carrying conductor 24 . A finger 51 is provided at one end of the connecting conductor 50 and is connected to a contact 52 disposed on the current-carrying conductor 24 . Further, a finger 53 provided at the other end of the connection conductor 50 is connected to the contact 42 of the second lead terminal 26.

Further, the current-carrying conductor 24 extends upward even after branching off from the connecting conductor 50 at the second lead terminal portion 26, and is disposed between the second and third lead terminals 26 and 33 of the circuit breaker 21. installed supporting insulation 5
It is supported and fixed by 4.

Note that the upper end surface of the current-carrying conductor 24 is processed into a spherical shape. This is the current-carrying conductor 24
This is to prevent poor insulation from occurring between the upper end of the conductor 31 and the current-carrying conductor 31 led out from the third lead terminal 33.

In the gas-insulated switchgear of this embodiment having such a configuration, the current-carrying conductor 24 arranged parallel to the axis of the container 21 connects the finger 40a at the lower end to the contact 41 provided on the circuit breaker conductor 23. On the other hand, the upper end is supported by a support insulator 54 provided in the container 21. Therefore, the current-carrying conductor 24 is fixed in a stable state, and the current-carrying conductor 24 does not vibrate or change distortion. Further, when connecting the connecting conductor 50 and the main bus bar 30, the horizontal load applied to the current-carrying conductor 24 is supported by the upper and lower support parts of the current-carrying conductor 24, so that the current-carrying conductor 24 may become distorted or the connection may become impossible. This can also be prevented.

Note that the present invention is not limited to the above-described embodiments, and as shown in FIG.
is supported by the circuit breaker conductor 23 at its lower part, and furthermore, a support insulator 5 is provided between the first and second lead terminals 25 and 26 at the middle part of the current-carrying conductor 24.
5 may be supported.

[Effects of the Invention] As described above, according to the present invention, the current-carrying conductor arranged parallel to the axial direction of the container is supported and fixed by the circuit breaker conductor and the supporting insulator provided in the container. This prevents the current-carrying conductor from excessively vibrating due to the electromagnetic force flowing through the current-carrying conductor, and also prevents the horizontal load applied to the current-carrying conductor when connecting it to the main bus bar at the second lead terminal. This has the effect of providing a highly reliable gas-insulated switchgear without deforming or deforming the current-carrying conductor.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the gas insulated switchgear of the present invention, Fig. 2 is a cross-sectional view showing another embodiment of the present invention, and Fig. 3 is a single line connection diagram for one line of a multi-bus system. , FIG. 4 is a sectional view showing the configuration of a conventional gas insulated switchgear based on the end line diagram in FIG. 3, and FIG.
The figure is a sectional view showing another configuration of a conventional gas insulated switchgear, FIG. 6 is a view taken in the direction of arrow A in FIG.
The figure is an enlarged view of the current-carrying conductor portion in the circuit breaker of FIG. 5. 1... Circuit breaker, 2... Top outlet terminal, 3...
Lower outlet terminal, 4... Connection bus bar, 5, 6... Disconnector, 7, 8... Main bus bar, 9... Instrument current transformer,
DESCRIPTION OF SYMBOLS 10...Disconnector, 11...Grounding device, 12...Connection busbar, 13...Instrument transformer, 14...Cable connection part, 20...Breaker, 21...Container, 22
... Breaking part, 23 ... Circuit breaker conductor, 24 ... Current-carrying conductor, 25 ... First lead terminal, 26 ... Second
Output terminal, 27, 28...Disconnector, 29, 3
0... Main bus bar, 31... Circuit breaker conductor, 32... Instrument current transformer, 33... Third lead terminal, 34...
...Disconnector, 35...Grounding device, 36...Cable connection section, 37...Instrument transformer, 40a, 40b
...Finger, 41, 42...Contact, 50...
... connection conductor, 51 ... finger, 52 ... contact, 53 ... finger, 54 ... support insulator,
55...Supporting insulator.

Claims (1)

[Scope of Claims] 1. Each phase cut-off section having a fixed side and a movable side electrode that can be moved toward and away from each other is housed in a container filled with insulating gas, and from both upper and lower ends of each phase cut-off section, respectively. Circuit breaker conductors for each phase extend parallel to the axis of the vessel, and the circuit breaker conductors for each of the upper and lower phases are provided horizontally above and below the vessel at their upper or lower ends. A second outlet terminal led out from the first and third outlet terminals to the outside of the container and provided horizontally in the middle part of the container is provided, and this second outlet terminal is provided with a second outlet terminal located at the bottom of the container. In a three-phase gas-insulated switchgear, in which the current-carrying conductors of each phase are connected to the circuit breaker conductors of each phase that are drawn out from the lead-out terminal, the current-carrying conductors of each phase are connected to the circuit breaker conductors of each phase that are The conductor is arranged parallel to the axis of the container, and the current-carrying conductor of each phase is supported at the bottom by the circuit breaker conductor located below the container, and by the support insulator disposed in the container at the top. A gas insulated switchgear characterized by being supported by.