JPS6259521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated switchgear, and particularly to a gas insulated switchgear incorporating a protection device such as a lightning arrester.

Modern ultra-high voltage and ultra-ultra high voltage (UHV) substations are attempting to reduce their base insulation strength (BIL) to reduce costs. for example
In a 500kV substation, the BIL of the transformer is 1550kV, while the BIL of the switchgear including the circuit breaker is 1800kV.
It is unbalanced. The difference in BIL between the two is
This occurs because transformers are always protected by lightning arresters.

Recently, with the development of zinc oxide lightning arresters with good protective properties, it is possible to reduce BIL even in gas-insulated switchgear by placing this lightning arrester in front of the line entrance main bus and transformer.

1 and 2 show a conventional gas insulated switchgear. As a phase-separated double bus system, the switching units are arranged on both sides of main bus lines A and B, which are linearly constructed at approximately the same level. For example, in the switching unit 1, a cable head 6, a disconnector 5, and a shingle breaker 4 are electrically connected in series, and the other end of the shingle breaker 4 is connected to the main wire via a disconnector 3, as shown in FIG. To bus A, also disconnect switch 2
and is connected to the main bus conductor 12 of the main bus B via the connection conductor 13. The lightning arresters 7 and 8 connected to the main busbars A and B were constructed in dedicated connection parts formed along the axial direction of the main busbars, as shown in FIG. Therefore, there was a drawback that the added lightning arresters 7 and 8 increased the axial lengths of the main busbars A and B.

An object of the present invention is to provide a gas-insulated switchgear that allows connection of a protection device such as a lightning arrester without increasing the axial length of the main bus bar.

The main bus bar of the present invention, which is necessary for connecting the protection device to the main bus bar, is constructed by combining a protection device such as a lightning arrester with a switchgear unit mainly composed of a bridge and a disconnector. The aim is to shorten the axial length of the

The present invention will be explained below with reference to embodiments shown in the drawings.

As shown in FIG. 3, it can be noted that the lightning arrester 7 is constructed integrally with the switching unit 1. A lightning arrester 7 connected to the main bus B is shown in FIG. The external configuration of the opening/closing unit 1 and the main bus bars A and B is the same as that of the conventional example. A lightning arrester 7 is arranged on the side of the main bus bar B. The electrical connections are shown in FIG. The internal configuration of the disconnector 4 including the disconnector 3 is the same as the conventional example, but the configuration of the disconnector 2 is different from the conventional example. That is, the containers 9 and 10 connected to the main busbars A and B have the same shape, the disconnector 3 is constructed within the container 9, and the substantially horizontal container 11 connects the substantially vertical containers 9 and 10.
A disconnector 2 is configured inside. A container for the lightning arrester 7 is connected to the container 10, and thereby the lightning arrester 7 is connected to the main bus conductor 12.

By structuring the disconnector 2 to open and close horizontally in this way, the connection conductor 13 inside the container 10
can be directly connected to the main bus conductor 12 , and connecting the lightning arrester 7 to this connection conductor 13 means connecting the lightning arrester 7 to the main bus conductor 12 .
Therefore, the lightning arrester 7 is not limited to the connection structure shown in FIG.
It can be connected to the head of the container 10 or can take various connection structures.

In FIG. 2, which shows the conventional configuration, such a connection structure cannot be adopted. In the configuration shown in the figure, the connection conductor 13 that is directly connected to the main bus conductor 12 is only a vertically rising portion. Placing the equipment low in order to improve earthquake resistance means shortening the axial length of the connecting conductor 13. Therefore, in a configuration where the equipment is placed low, the only place left to connect the lightning arrester 7 is on the outside of the side of the main bus B, and the lightning arrester 7 must be connected directly to the main bus conductor 12 here. No. However, such a connection can be made only for the main bus of the outermost phase that is farthest from the shingle breaker 4, and such a connection structure cannot be made for other phases.

However, in FIG. 5, the vertical conductor 1 in the container 10 corresponds to the connecting conductor 13 in FIG.
3a and the horizontal conductor 13b, and by configuring the disconnector 2 as a horizontal conductor part, the vertical conductor 13
a can be the axial length corresponding to the height of the device. Therefore, the lightning arrester 7 can be configured together with the switching unit 1. Moreover, this structure can be made the same structure for each phase by the vertical conductor 13a.

Furthermore, it is known that an instrument transformer is connected to the main bus using the same circuit configuration as the lightning arrester 7. Therefore, the present invention can also be applied to a gas insulated switchgear in which a voltage transformer is connected instead of the lightning arrester 7.

In addition, in this embodiment, the strainer breaker 4 and the container 1
Although we have described the case in which the first class is configured on the same axis, it is also possible to configure these on different axes, or with a bent part in the middle, and in this example, the opening/closing unit of each phase can be configured. Disconnector 4, disconnector 2, 3
Although the lightning arresters 7 are arranged on substantially the same vertical plane, they may be partially arranged on different vertical planes, and it is sufficient that they extend in a direction perpendicular to the main bus line.
The same configuration applies to switchgear units other than the switchgear unit to which lightning arresters and potential transformers are connected, and as a disconnector that connects the blockage and disconnector 4 to the main busbar, the switchgear and the conductors placed opposite each other in the horizontal direction are used as disconnectors. Standardization can be achieved by configuring the device to open and close. For this purpose, a desirable configuration of the disconnector is to use a horizontal conductor inside the container 10. According to this, the switching unit without a protective device is connected to the opening for connection with the lightning arrester 7 in the container 10. can be used to connect the operating system. The opening/closing unit to which the present invention is applied is not limited to a feeder having one end as an insulation lead-out means for a cable or the like as shown in FIG. 4, but can also be applied to bus ties and bus sections.

Furthermore, in this embodiment, as shown in FIG. The present invention can also be applied to a structure in which all the opening/closing units are arranged on one side of A and B. In this latter configuration,
Since it is not possible to adopt the configuration shown in Figure 5 in order to install a protection device such as a lightning arrester on the main bus bar on the side near the disconnector, it is necessary to form a dedicated section for connecting the protection device, and in that section The axial length of the main generatrix of will increase somewhat. However, compared to the conventional system in which dedicated connection parts are formed for both main busbars, the axial length of the dedicated connection part can be reduced to 1/2 of the conventional method. In this respect, it is preferable to adopt the system shown in FIG. 3 as the best embodiment. This is because the same structure can be adopted regardless of which side of the main bus bar the opening/closing unit is placed.

As explained above, the present invention connects the breaker and the main bus by having a substantially vertical conductor connected to the main bus conductor and a substantially horizontal conductor, and connects the breaker to the main bus conductor. Because of this structure, the protection device connected to the main bus can be connected to the conductor between the disconnector and the main bus and configured together with the switching unit, without increasing the axial length of the main bus.

In addition, in the present invention, a structure centered on the sheath disconnector is arranged on both sides of the main bus of the double bus system, and the protection device is integrated with this, so the main bus is a dedicated connection part for the protection device. The axial length can be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional gas insulated switchgear, FIG. 2 is a partial sectional view of FIG. 1, FIG. 3 is a plan view of a gas insulated switchgear according to an embodiment of the present invention, and FIG. is the - view of Fig. 3, and Fig. 5 is the - view of Fig. 4.
It is a partial cross-sectional enlarged view of the figure. A, B...Main bus bar, 2, 3...Disconnector, 4...
Shinya disconnector, 7, 8... Lightning arrester, 9, 10, 11...
... Container, 12 ... Main bus conductor, 13 ... Connection conductor, 13a ... Vertical conductor, 13b ... Horizontal conductor.

Claims (1)

[Scope of Claims] 1. A switching unit for each phase configured to extend in a horizontal direction substantially perpendicular to the axial direction of a main bus line of a phase-separated type configured linearly, the switching unit comprising:
In those having a bottom breaker connected to the main bus through a disconnector, a substantially vertical conductor is provided directly connected to the main bus, and connected to the other end of the vertical conductor and connected to the bottom breaker. The above-mentioned disconnecting switch is configured to open and close almost horizontally in the electrical circuit, and a protective device is connected at one end to the conductor located between the above-mentioned disconnecting switch and the above-mentioned main bus bar. A gas insulated switchgear characterized by being placed on the side of the bus bar. 2. A gas insulated switchgear according to claim 1, in which a lightning arrester is used as the protection device. 3. The gas-insulated switchgear according to claim 1, wherein an instrument transformer is used as the protection device. 4. In the thing described in claim 1 above, the above-mentioned shield disconnector in the switching unit of each phase,
A gas-insulated switchgear in which the above-mentioned disconnector and the above-mentioned protection device are arranged on substantially the same vertical plane. 5. In the item described in claim 1, the main bus bar is a phase-separated double bus bar provided in two sets, each having a substantially vertical container above the main bus bar, and the container A gas insulated switchgear in which the above-mentioned disconnector is configured in a substantially horizontal container that connects opposing parts. 6. The gas insulated switchgear according to claim 5, wherein one end of the protection device is connected to the conductor on the axis of the container constituting the disconnector. 7 A phase-separated dual-bus type main bus line configured linearly at approximately the same level is provided, and each phase has a plurality of switching units extending in a horizontal direction substantially perpendicular to the axial direction of the main bus line. and the switching unit has a bow disconnector connected to both main busbars through one disconnector, and the bowbreak disconnector is arranged on one side of the main busbar. A switching unit and a switching unit in which the shield disconnector is placed on the other side of the main bus are provided, and both switching units are arranged between the shield disconnector and the main bus that is farther away from the shield disconnector. The above-mentioned disconnecting switch is configured to open and close almost horizontally on a substantially horizontal conductor provided, and the above-mentioned disconnecting switch and the above-mentioned main bus bar are connected by a connecting conductor having a substantially vertical conductor, A gas insulated switchgear characterized in that protective devices each having one end connected to the connecting conductor are arranged on the side of the main bus bar on the side opposite to the main bus bar. 8. In the thing described in claim 7 above, the above-mentioned shield disconnector in the switching unit of each phase,
A gas-insulated switchgear in which the above-mentioned disconnector and the above-mentioned protection device are arranged on substantially the same vertical plane.