JP3256836B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and more particularly to a gas insulated switchgear having a rated voltage of 120 kV class.

[0002]

2. Description of the Related Art In a conventional gas insulated switchgear, particularly in a rated voltage of 120 kV class, a circuit breaker is arranged on the outermost side, and a device on a bus side and a device on a line side are arranged along a certain direction. They were arranged in a stack. For example, a bus disconnector is provided on each of the two main buses and housed in containers, respectively, the containers of this disconnector are connected to each other by a detachable device, and a detachable device of a container of one disconnector. On the opposite side, a container accommodating the current transformer is provided, and the container accommodating the current transformer is connected to the container accommodating the circuit breaker to constitute a lower stage. Connect another current transformer container to the upper current transformer container, and check the breaker on the lower bus disconnector container on the opposite side of the upper current transformer container breaker container. The upper stage was constructed by providing a container in which a grounding switch, a line disconnector, and a line grounding switch were arranged in this order. The upper part of the tall lightning arrestor container fixed to the ground is connected to the opposite side of the line disconnecting switch container of the line grounding switchgear container at the upper end, and further above this lightning arrester container. A container containing an instrument transformer was attached, and an upper part of a cable head container fixed to the ground was connected to the upper part of the lightning arrester container on the opposite side of the earthing switch on the upper side.

[0003]

A conventional rated voltage of 120
Since the kV class gas insulated switchgear is arranged and arranged in a two-tier configuration as described above, the height of the entire gas insulated switchgear increases, and when transporting this gas insulated switchgear, In this case, the truck could not be loaded, and was transported by being loaded on a trailer. For this reason, there is a drawback that the cost for transportation becomes large.

[0004] Further, since the height is high, there is a drawback that it cannot be installed in an underground substation or a place where the height is restricted.

The present invention has been made to solve the above-mentioned drawbacks of the conventional gas insulated switchgear, and has a small overall shape which can be transported by a normal truck. An object of the present invention is to provide a gas insulated switchgear that can be installed even in a place where space is narrow.

[0006]

The gas insulated switchgear of the present invention has at least a bus disconnector and a main bus arranged in one direction around a circuit breaker, and at least a line ground switch in the other direction. And a lightning arrester, a current transformer, and a cable head. In other words, the gas insulated switchgear of the present invention is centered on the first container in which the circuit breaker is stored.
At least one bus disconnector and main bus in one direction
Two second containers placed one above the other, and
At least the third where the earthing switch for the track and the lightning arrester are stored
In the gas insulated switchgear comprising a container, the
The second container and the third container of the two containers are respectively
Connected at the upper end of the first container, and above the circuit breaker.
Position the terminal at the height of the connection portion between the second container and the third container.
And a link mechanism for driving the circuit breaker.
And housed in the first container and arranged below the circuit breaker,
An operating device for opening and closing the circuit breaker through a link mechanism
It is arranged in a space below the second container .
Thus, a gas-insulated switchgear having a low height can be obtained.

That is, since the main bus is arranged laterally above the circuit breaker, each component can be arranged without providing a disconnector or a ground switch on the main bus, and the height is low. A gas insulated switchgear can be obtained.

[0008] From what has been placed in the same container as that houses the breaker a link mechanism portion of the circuit breaker, as compared to separately provide linkage mechanism, obtaining a low profile gas insulated switchgear be able to.

[0009] Incidentally, it is possible to positioned outside the circuit breaker operating device from directly below the breaker, it is possible to reduce the height of the container breaker according to this, low gas insulated height A switchgear can be obtained.

Further, circuit breaker, disconnecting switch and the control panel grounding switch be configured by housing in one control box
According to this, a gas-insulated switchgear having a small installation area can be obtained.

Further, if it is constructed by arranging the lightning arrester at least disconnector and grounding switch and the same gas compartment
Et al., The number of containers for accommodating the respective components can be reduced, it is possible to obtain a small gas-insulated switchgear of the overall shape.

Further, the current transformer can be arranged below the cable head , whereby the space below the cable head can be utilized and a gas-insulated switchgear having a small installation area can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas insulated switchgear according to the present invention will be described below with reference to the drawings. The gas insulated switchgear according to the present embodiment includes a circuit breaker 1, disconnectors 3, 4, 8, ground switches 2, 9, main buses 5, 6, a lightning arrester 10, and current transformers 13, 14 constituting a substation. , 15 etc. are insulated with sulfur hexafluoride (SF ₆ ) gas to make the overall shape compact.

FIG. 1 is a side view of the gas-insulated switchgear of the present embodiment, and FIG. 2 is a single-line diagram of the gas-insulated switchgear shown in FIG. Note that the broken lines in FIG. 1 show the approximate arrangement positions of the components of the gas insulated switchgear of this embodiment arranged in each container and the connections between them. FIG.
2, the circuit breaker 1 is mounted on a circuit breaker link mechanism 1 a for driving the circuit breaker 1, and the grounding switches 2 and 7 for inspecting the circuit breaker, the line disconnector 8, and the bus disconnector. Connected to the vessels 3 and 4. The circuit breaker 1, the link mechanism 1a, and the grounding switches 2, 7 are arranged in the same gas compartment, and a conventional gas insulated switchgear in which the circuit breaker 1 and the link mechanism 1a are arranged in separate gas compartments. In comparison, the overall height of the gas insulated switchgear can be reduced.

At the top of one end of the container of the circuit breaker 1,
Main buses 5, 6 are arranged vertically above and below the bus disconnectors 3, 4, respectively. The tank diameter of the main buses 5 and 6 is made smaller than the conventional tank diameter, and is not directly installed on the ground like the main bus tank of the conventional gas insulated switchgear. It is attached to the high position of one container. The lower space of the thus created has been the main busbar tank, breakers 1, disconnector 3,4,8, control box which integrates the control panel for controlling the grounding switch 2 and 9 17 and a breaker operating device 16 provided on the front surface of the control box 17 are arranged. The operating device 16 is the operating device 1
6 that are connected to shock absorbers 18 and 19 provided at the lower part of the container of the circuit breaker 1 for absorbing the spring force of the circuit breaker 1.
By arranging in this manner, the height of the container of the circuit breaker 1 can be reduced as compared with the conventional gas insulated switchgear in which the operation device 16 is disposed below the circuit breaker 1, and thus the entire gas insulated switchgear is provided. Height can be reduced. In addition, since each control panel is integrated with the control box 17 and disposed below the main bus tank, the entire installation area of the gas insulated switchgear can be reduced.

At the end of the container of the circuit breaker 1 opposite to the side where the main bus tank is mounted, a container housing the disconnecting switch 8, the grounding switch 9 for the track, and the lightning arrester 10 is connected. The container storing the cable head 12 is connected to an end of the container storing the cable head opposite to the container. This is a structure in which the lightning arrester 10 is not removed during the on-site withstand voltage test because the reliability of the lightning arrester 10 is improved. By arranging in this way, the lightning arrester 10 is arranged in the same gas compartment as the disconnecting switch 8 and the earthing switch 9, and compared with a conventional gas insulated switchgear arranged in separate gas compartments. In addition, it is possible to reduce the size of the entire gas insulated switchgear.

At the upper part of the container housing the cable head 12 on the opposite side of the container housing the lightning arrester 10, a container housing the instrument transformer 11 is mounted. The container housing the cable head 12 is a hollow base. The current transformers 13, 14, and 15 are set on the pedestal 20 and are mounted on the pedestal 20. By installing the current transformers 13, 14, and 15 in the hollow space below the container containing the cable head 12, the conventional gas insulation for accommodating the current transformer in the container adjacent to the container containing the circuit breaker is provided. Compared with the arrangement of the switchgear, the lateral dimension of the gas-insulated switchgear of this embodiment, that is, the installation area can be reduced.

As described above, the gas insulated switchgear of the present embodiment has the bus disconnector 3 on the bus side with the circuit breaker 1 interposed therebetween.
4 and main buses 5 and 6, and a line disconnector 8, a grounding switch 9, a lightning arrester 10, and current transformers 13, 14, 15
The dimension in the height direction can be restricted as compared with a conventional gas insulated switchgear arranged in the opposite direction by 0 ° and having the line-side disconnector and switch on the busbar-side disconnector switch.

[0019]

According to the present invention, for example, a rated voltage of 120 k
In the case of the V type, the entire height can be reduced to 2.75 meters or less, which can be loaded on a 10-ton loading truck, and it can be transported using a 10-ton low-floor truck. Is about 1/3 of the current situation.

Further, the shape and weight of the entire gas insulated switchgear can be reduced, the installation area can be reduced, it can be used as an underground substation, and it can be installed in a narrow and fragile location. .

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a gas insulated switchgear according to the present invention.

FIG. 2 is a single-line diagram of the gas-insulated switchgear of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breaker 2,7 Grounding switch for circuit breaker inspection 3,4 Bus disconnector 5,6 Main bus 8 Line disconnector 9 Line grounding switch 10 Lightning arrester 12 Cable head 13,14,15 Current transformer 16 Breaker operating device 17 Control box

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Yamamoto 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant of Hitachi, Ltd. (72) Kenichi Okubo 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 In the Kokubu Plant of Hitachi, Ltd. (56) References JP-A-7-123546 (JP, A) JP-A 62-33610 (JP, U) JP-A 3-80608 (JP, U) Kaihei 3-63013 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02B 13/02

Claims (1)

(57) [Claims] 1. A first container in which a circuit breaker is housed.
At least one bus disconnector and main bus in one direction
Two second containers placed one above the other, and
At least the third where the earthing switch for the track and the lightning arrester are stored
In the gas insulated switchgear comprising a container, the
The second container and the third container of the two containers are respectively
Connected at the upper end of the first container, and above the circuit breaker.
Position the terminal at the height of the connection portion between the second container and the third container.
And a link mechanism for driving the circuit breaker.
And housed in the first container and arranged below the circuit breaker,
An operating device for opening and closing the circuit breaker through a link mechanism
A gas insulated switchgear arranged in a space below the second container .