JP2530394Y2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a gas insulated switchgear installed in an electric station such as a substation.

[Prior Art] As this kind of gas insulated switchgear, a circuit breaker unit configured by housing a circuit breaker and its peripheral devices in a container,
A cable head unit that houses the cable head that draws the line and its peripheral equipment in a container, and auxiliary devices such as lightning arresters and voltage transformers that are connected to the circuit closer to the line than the circuit breaker are housed in the container. There is an auxiliary device unit configured with such a configuration, and these units are interconnected.

FIGS. 3 (A) and 3 (B) are a front view and a right side view schematically showing the appearance of a conventional device of this type.
The electrical configuration of each phase of the gas insulated switchgear is as shown in the single-line diagram in FIG. In these figures, Ub1 is a first bus unit in which a first bus BUS1 and a first bus-side disconnector DS11 are housed in a container 1, and Ub2 is a second bus B.
Ucb is a second bus unit in which the US2 and the second bus-side disconnector DS12 are housed in the container 2, and Ucb includes the circuit breaker CB, the current transformer CT, and the earthing switches ES11 and ES12. Is a circuit breaker unit housed in a container 4 supported above. On the front side of the container 4 of the circuit breaker unit, a device connection opening 4 constituting a device connection portion for connecting another unit.
The first and second bus units Ub1 and Ub2 are connected to the device connection openings 4a and 4b via insulating spacers 5 and 6, respectively.

An operation device of a circuit breaker is housed in the operation device box 3, and a container 4
Is connected to the operation device in the operation box 3 via an insulating operation rod.

Uh1 is a cable head unit configured by housing a cable head CH1, a line-side disconnector DS2, and a grounding switch ES2 in a container 8 supported on a gantry 7, and the cable head unit is a circuit breaker unit Ucb. It is installed on the back side alongside the circuit breaker unit. Cable head Uh1
In the upper part on the front side and the lower part on the back side of the container 8, device connection openings 8 a and 8 b constituting a device connection portion for connecting another unit are provided, and constitute a front device connection portion. The opening 8a is connected to the device connection opening 4c of the container 4 of the circuit breaker unit via the insulating spacer 9.

Us1 is an auxiliary device unit in which a voltage transformer for instrument LPT is housed in a container, and this auxiliary device unit has a disconnection portion D in an opening 8b constituting an equipment connection portion on the rear side of the container 8 of the cable head unit. Connected through.

10 and 11 are operating devices of the bus-side disconnectors DS110 and DS12, and 12 and 13 are operating devices of the line-side disconnector DS2 and the earthing switch ES2, respectively.

The cable head CH1 is attached to the bottom of the container 8 in an upright state, and a terminal portion of a power cable which is set up from the underground cable pit through the inside of the mount 7 is connected to the cable head.

FIGS. 5 (A), (B) and 6 show examples in which the auxiliary equipment unit is different. In this example, the auxiliary equipment unit Us2 accommodates the lightning arrester LA and the voltage transformer LPT for the instrument in a container. It consists of what you did.

Containers of each unit described above has a hermetic structure, is in each container SF ₆ gas is filled at a predetermined pressure as an insulating gas.

In the gas insulated switchgear as described above, a cable head unit is additionally provided when a line is added. 7A and 7B show a case where a cable head unit is added in the example shown in FIG. 3, and the electrical configuration of each phase is as shown in FIG. In these figures, Uh1 is the main cable head that was installed from the beginning, Uh2 is the additional cable head unit that was added,
The additional cable head unit Uh2 includes a cable head CH2 housed in a container 16 supported on a gantry 15. The auxiliary equipment unit Us1 is connected to the lower part on the back side of the main cable head unit Uh1 installed from the beginning, so when installing an additional cable head unit Uh2, the container of the main cable head unit Uh1 extends the upper part Is replaced with the used container 8 '. A device connection opening 8c 'provided on the upper rear side of the container 8' of the main cable head unit Uh1 and a device connection opening 16a provided on the upper front side of the container 16 are connected via a connection conduit 17. The conductors of the cable heads CH2 and CH1 are connected to each other through connection conductors provided in the connection conduit 17.

9 (A) and 9 (B) show a case where a cable head unit is added in the example shown in FIGS. 5 (A) and 5 (B), and the electrical configuration of each phase is shown in FIG. As shown in FIG.

[Problems to be Solved by the Invention] As described above, in the conventional gas insulated switchgear with the additional cable head unit, the main cable head unit in which the auxiliary device unit is installed from the beginning and the additional cable head unit are connected. Since the connection conduit 17 is disposed above the auxiliary device unit and is located above the auxiliary device unit, there is a problem that work such as inspection and replacement of the auxiliary device unit becomes difficult.

In addition, not only is it necessary to replace the container of the main cable head unit with a new container 8 'whose upper part is extended at the time of the extension work, but also it is necessary to provide the connection pipe line 17, so that the cost required for the extension is high. In addition, there was a problem that the construction period was long.

An object of the present invention is to propose a configuration of a gas insulated switchgear after a cable head unit is added, which solves the above problem.

[Means for Solving the Problems] In the present invention, FIGS. 1A and 1B show an embodiment thereof.
As can be seen in FIG. 1, a circuit breaker unit Ucb in which a circuit breaker CB and its peripheral devices are housed in a container 4, and a cable head CH1 for drawing a line and its peripheral devices in a container 8 are mainly constructed. Cable head unit Uh1 and additional cable head unit provided for adding lines
Uh2 and an auxiliary device unit Us1 that includes auxiliary devices such as a lightning arrester LA and a voltage transformer LPT connected to a circuit on the line side of the circuit breaker unit, and an auxiliary device unit Us1 formed in a container so as to form a predetermined switching circuit. In the gas insulated switchgear connected, an additional cable head unit can be installed without replacing the container of the main cable head unit.

Therefore, in the present invention, the main cable head unit Uh1 is disposed at a position adjacent to the breaker unit Ucb, and a device for connecting another unit to the surface of the main cable head unit opposite to the breaker unit. Connection
8b is provided. Extension cable head unit Uh2
Is disposed adjacent to the main cable head unit Uh1 on the side opposite to the circuit breaker unit Ucb, and the additional cable head unit Uh2 is connected to the device connection portion 8b of the main cable head unit Uh1. The auxiliary equipment unit Us1
It is connected to the surface of the extension cable head unit Uh2 opposite to the circuit breaker unit Ucb, or is connected to the upper portion of the extension cable head unit. The equipment connection section 8b of the main cable head unit is the extension cable head unit.
It is configured so that the auxiliary device unit can be connected when Uh2 is disconnected.

[Operation] As described above, the extension cable head unit is arranged at a position adjacent to the main cable head unit, the extension cable head unit Uh2 is connected to the device connection portion 8b of the main cable head unit, and the auxiliary device unit is extended. If the cable head unit is connected to the surface on the opposite side of the breaker unit or to the upper part of the additional cable head unit, there is no need to provide a connection conduit above the auxiliary device unit that hinders work. Inspection and replacement of equipment can be performed easily.

In addition, as described above, if both the auxiliary device unit and the extension cable head unit are configured to be connected to the device connection portion of the main cable head unit, when the cable is added, the main unit that was installed before the extension was installed. The additional cable head unit can be connected using the container of the cable head unit as it is, and a connection pipeline is unnecessary, so that the period required for the construction can be shortened.

Furthermore, with the above configuration, it is not necessary to replace the container of the main cable head unit when adding a cable, and it is not necessary to install new parts other than the additional cable head unit. In addition, the cost required for expansion can be minimized.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1A and 1B show an embodiment in which a cable head is added to the existing gas insulated switchgear shown in FIG. 3, and a breaker unit Ucb is supported on an operation box 3;
First and second bus units Ub1 and Ub2 are connected to the front side of the circuit breaker unit Ucb. The main cable head unit Uh is placed on the mount 20 arranged side by side with the operation box 3.
One container 8 is installed adjacent to the container 4 of the circuit breaker unit. The container 21 of the added additional cable head unit Uh2 is also arranged on the gantry 20 so as to be adjacent to the container 8 of the main cable head unit Uh1 on the side opposite to the circuit breaker unit Ucb.

The container 8 of the main cable head unit Uh1 has been installed from the beginning, and a device connection opening 8a which forms a device connection portion for connecting a circuit breaker unit is provided on the front side of the container 8. The opening 8a is connected to an opening 4c on the back side of the container 4 of the circuit breaker unit via an insulating spacer 9.

In the lower part of the back side of the container 8 of the main cable head unit Uh1, a device connection opening 8b constituting a device connection portion for connecting another unit is provided, and this opening (device connection portion) 8b , The auxiliary equipment unit Us1 and the extension cable head unit Uh2 are formed in such a size that they can be connected.

In the present invention, the device connection opening (device connection portion) 8b of the main cable head unit Uh1 to which the auxiliary device unit Us1 was connected before the cable expansion is used to connect the additional cable head unit Uh2.

The container 21 of the extension cable head unit Uh2 has a device connection opening 21a at the lower portion on the front side thereof, and the device connection opening 21a is connected to the device connection opening 8b of the container 8 via the insulating spacer 22. ing. A cable head CH2 is attached to the bottom of the extension cable head unit Uh2 in the container in an upright state, and the cable head CH2 is connected to a terminal portion of a cable set up from an underground cable pit. The auxiliary device unit Us1 is connected to the upper surface of the container 21 of the additional cable head unit.

2A and 2B show an embodiment in which a cable head unit is added to the existing gas insulated switchgear shown in FIG. 5. In this embodiment, an additional cable head unit is shown.
A device connection opening 21b is provided in an upper portion of the back surface (the surface opposite to the circuit breaker unit) of the container 21 of Uh2, and the auxiliary device unit Us2 is connected to the opening via an insulating spacer 23. The auxiliary device unit Us2 of this example is composed of an arrester unit containing the arrester LA in the container 25 and an instrument voltage transformer LPT connected to the upper surface of the arrester container 25, and the container of the arrester LA is connected to the cable head unit Uh2. It is connected. Other points are the same as those of the embodiment of FIG.

As described above, both the auxiliary device unit and the additional cable head unit can be connected to the device connecting portion provided on the back side of the main cable head unit, and the additional cable head unit is connected to the main cable head unit. If the auxiliary equipment unit is connected to the surface of the extension cable head unit opposite to the circuit breaker unit or to the top of the extension cable head unit, the auxiliary equipment unit is removed and the extension cable head is removed. The extension work can be completed only by installing the unit and connecting the auxiliary equipment unit to the extension cable head unit, and the extension work period can be shortened. In addition, it is not necessary to replace the container of the main cable head unit when adding a cable, and it is not necessary to attach a new component other than the additional cable head unit. Therefore, the cost required for the addition can be minimized.

[Effects of the Invention] As described above, according to the present invention, the auxiliary device is connected to the additional cable head unit from the outside,
Since there is no connection pipe above the auxiliary equipment, the inspection and replacement of the auxiliary equipment can be easily performed.

Further, according to the present invention, the auxiliary cable and the extension cable head unit can be connected to the device connection portion of the main cable head unit, so that the container of the main cable head unit can be replaced when the cable is added. Since the additional cable head unit can be connected using the container of the main cable head unit that was initially installed without any change, there is an advantage that the period required for the construction can be shortened.

Further, according to the present invention, it is not necessary to replace the container of the main cable head unit when adding a cable, and it is not necessary to install a new part other than the additional cable head unit. Thus, the cost required for expansion can be minimized.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a right side view showing a first embodiment of the present invention, respectively. FIGS. 2A and 2B are a front view and a right side view showing a second embodiment of the present invention, respectively. 3A and 3B are a front view and a right side view, respectively, showing an example of an existing gas insulated switchgear, and FIG. 4 is a single-line diagram showing an electric configuration of each phase of the gas insulated switchgear of FIG. , FIGS. 5A and B
FIG. 6 is a front view and a right side view showing another example of the existing gas insulated switchgear. FIG. 6 is a single-line diagram showing the electric configuration of each phase of the gas insulated switchgear of FIG. A and B
Is a front view and a right side view showing a conventional example in which a cable head is added to the gas insulated switchgear of FIG. 3, and FIG. 8 shows an electric configuration of each phase of the gas insulated switchgear of FIG. FIGS. 9A and 9B are front and right side views, respectively, showing a conventional example in which a cable head is added to the gas insulated switchgear of FIG. 5, and FIG. 10 is a gas insulated switchgear of FIG. FIG. 2 is a single-line diagram showing an electrical configuration of each phase of FIG. Ucb: Circuit breaker unit, Uh1: Main cable head unit, Uh2: Additional cable head unit, Us1, Us2 ...
... Auxiliary equipment unit, 4 ... Circuit of circuit breaker unit, 8
…… Container for main cable head unit, 21 …… Container for additional cable head unit.

Claims (1)

(57) [Scope of request for utility model registration] A circuit breaker unit configured to house a circuit breaker and its peripheral equipment in a container; a main cable head unit configured to house a cable head for drawing a line and its peripheral equipment in a container; An additional cable head unit provided for adding a line, and an auxiliary device unit including an auxiliary device such as a lightning arrester or a voltage transformer connected to a circuit on the line side of the circuit breaker unit in a container. The main cable head unit is disposed adjacent to the circuit breaker unit, and the circuit breaker unit of the main cable head unit is connected to the circuit breaker unit. A device connection portion for connecting another unit is provided on a surface opposite to the circuit breaker unit. The auxiliary cable unit is disposed adjacent to the main cable head unit on the side of the main cable head unit, and the additional cable head unit is connected to a device connection portion of the main cable head unit. The auxiliary device unit is connected to a breaker unit of the additional cable head unit. The main cable head unit is connected to an opposite surface or an upper portion of the additional cable head unit, and the device connection portion of the main cable head unit may connect the auxiliary device unit when the additional cable head unit is detached. A gas insulated switchgear characterized by having such a configuration.