JP2798930B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a gas insulated switchgear comprising two main buses connected to one circuit breaker, and in particular, to a gas insulated switchgear. An improvement is made to the arrangement of a grounding switch for circuit breaker maintenance, which grounds a conductor between the circuit breaker and the bus-side disconnector during the maintenance of the circuit breaker.

(Prior Art) gas insulated switchgear, in a vessel filled with an excellent SF ₆ gas or the like in the insulating and arc extinguishing properties, blocking part of the circuit breaker and disconnecting switch, bus and the like as well as accommodating the disconnecting switch Are configured in combination. This type of switchgear can be configured to be significantly smaller than an air-insulated switchgear. In recent years, gas-insulated switchgears that can be downsized have been widely used in substations due to a remarkable rise in land prices and the like.
Furthermore, by arranging the components rationally, further miniaturization is achieved, and the cost reduction of the gas insulated switchgear and the further inexpensive and compact construction of the substation including the building of the indoor type gas insulated switchgear. Is possible.

Here, a conventional gas insulated switchgear of a double bus type circuit will be described with reference to FIG. This figure shows a feeder line that connects a doubly configured bus to a power cable line,
FIG. 2 is a side view of a gas-insulated switchgear formed by a conventional device configuration, in which a single-line connection diagram of a circuit is superimposed on a side view of the device.

In FIG. 7, a breaking section 5 which is an electrode section of the circuit breaker 1 is shown.
Is driven by an operating device (not shown) in a circuit breaker component box 7 housed in a circuit breaker container 6 arranged in a vertical direction and installed below the circuit breaker container 6. Also, on the side surface of the circuit breaker container 6, the first and second bus-bar connection outlet terminals 8, which protrude in the same direction and are arranged vertically in parallel,
9 and a line-side device connection output terminal portion 10 protruding in a direction opposite to the busbar connection output terminal portions 8 and 9 are provided. Of these, the bus terminal connection terminals 8, 9 are the branch conductor 1
1 is connected to one terminal of the blocking unit 5 in common, and the line-side device connection output terminal unit 10 is connected to the other terminal of the blocking unit 5 by a connection conductor 12. Also, the branch conductor 11
Is connected to a circuit breaker maintenance grounding switch 15 housed in the circuit breaker container 6.

Furthermore, the first and second main buses 13a, 13b disposed horizontally are connected to the respective busbar connection terminal portions 8, 9 of the circuit breaker container 6.
The bus-side units 2 and 3 in which the bus-side disconnectors 14a and 14b provided at right angles to the main buses 13a and 13b are collectively stored in the bus-side unit containers 16a and 16b, respectively, are provided with insulating spacers 18 respectively.
The gas is connected by a and 18b. Each of the bus-side units 2 and 3 includes a bus-side disconnector 14 having electrodes disposed at right angles to the main buses 13a and 13b and toward the circuit breaker 1.
a and 14b are connected to each other, and circuit breaker connection terminals 17a and 17b are provided in the extension direction of the disconnector. The circuit breaker connection terminals 17a and 17b are connected to the bus-side unit of the circuit breaker 1 as described above. It is formed so as to be connected to the connection outlet terminals 8 and 9. On the other hand, a current transformer 24, a circuit breaker maintenance grounding switch 27, a line-side disconnector 25, a line-side disconnector 25, which are sequentially connected from the circuit breaker side, are connected to the line-side device connection outlet terminal section 10 of the circuit breaker container 6. The line-side unit 4 in which the grounding switch 28 and the cable head 26 are collectively housed in the line-side unit container 29 is connected in a gas-separated manner by the insulating spacer 23.

(Problems to be Solved by the Invention) In the conventional gas insulated switchgear configured as described above, the grounding switch 15 for circuit breaker maintenance arranged on the bus side is housed in the circuit breaker container 6. When the circuit breaker 1 is removed for maintenance, the ground switch 15 for circuit breaker maintenance is also disconnected from the circuit at the same time. Therefore, when performing the work by opening the bus-side disconnectors 14a, 14b while keeping the main buses 13a, 13b in a live state, the circuit breaker-side terminals of the disconnectors 14a, 14b are subjected to electrostatic induction. The voltage was induced and there was a danger of electric shock during work. After removing the circuit breaker,
The circuit breaker side terminals of a and 14b had to be grounded again by another method.

In the conventional gas insulated switchgear, the branch conductor 11 and the grounding switch 15 for busbar circuit breaker maintenance are housed in another container, and one busbar connection outlet formed on the side of the circuit breaker container 6 is provided. It is configured to be inserted and connected between the terminal parts 8, 9 and the bus-side units 1, 2, but in this case, the above problem does not occur, but the apparatus becomes complicated and the gas insulated switch There is a disadvantage that the longitudinal dimension of the side surface of the device becomes long.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional gas insulated switchgear, improve the maintenance workability of the circuit breaker and the safety at the time of operation, and have a compact and simple gas insulated switchgear. It is to provide a device.

[Structure of the Invention] (Means for Solving the Problems) The gas insulated switchgear of the present invention comprises a circuit breaker-side terminal of first and second bus-side disconnectors in first and second bus-side units. By disposing the first and second grounding switches between the first and second circuit breaker outlet terminals, respectively, the grounding switch can be placed in the first and second bus-side units. Housed, and the first,
The rotary drive shaft of the second grounding switch is connected to one operating device via a set of connecting links, and this operating device is juxtaposed to the operating devices of the first and second busbar disconnectors. .

(Operation) In the present invention having the above configuration, since the grounding switch is provided in the first and second bus-side units, even when the circuit breaker is removed, the circuit-breaker side of the bus-side disconnector. Since the grounding switch that grounds the terminal is left, the danger of electric shock during the work is eliminated, and extra work such as grounding the breaker side terminal of the breaker again by another method after removing the breaker Is unnecessary. Also, the device is composed of the minimum necessary containers,
The longitudinal dimension of the side of the device can be reduced.

(Embodiment) An embodiment of the gas insulated switchgear of the present invention will be described with reference to FIG.

Note that the same parts as those of the conventional technique are denoted by the same reference numerals and description thereof will be omitted.

* Configuration of the embodiment * Fig. 1 is a partially cutaway side sectional view of a three-phase one-tank type gas insulated switchgear in which the same double-bus cable drop-in circuit as the conventional type shown in Fig. 7 is constructed according to the present invention. FIG. 2 is a single-line diagram of this circuit. In FIG. 1, the means for installing the first and second three-phase main buses and the like provided in the first and second bus units 2 have a well-known configuration, and are perpendicular to the axis of the circuit breaker container 6. Three-phase main buses 13a, 13b provided in the horizontal direction
Are connected to the movers of the first and second bus-side disconnectors 14a and 14b, while the stators of the first and second bus-side disconnectors 14a and 14b are the same as those of the conventional circuit breaker. Circuit breaker connection terminal connected to the first and second busbar connection outlet terminals of the container 6
Although connected to the branch conductors 11 via insulating spacers 18a and 18b, the gas-insulated switchgear of the present invention provides the circuit breaker terminals of the bus-side disconnectors 14a and 14b. Between the circuit breaker connection terminals 17a and 17b, first and second circuit breaker maintenance ground switches 30a and 30b are provided. The first and second circuit breaker maintenance grounding switches 30a and 30b are provided with a stator on a conductor extending in a stator extending direction of the first and second bus-side disconnectors 14a and 14b. A mover that moves horizontally and contacts the stator is provided. Furthermore, the first and second grounding switches for circuit breaker maintenance, which drive the movers of the circuit breaker maintenance grounding switches 30a and 30b, are arranged on the same vertical axis. I have. These two drive shafts 31a, 31b
Are provided to face each other in the direction between the first and second busbar units 2 and 3, and furthermore, both drive shafts 31a and 31b
It is connected to a ground switch operator 33 via 2. The grounding switch operating device 33 is disposed on the front of the first and second main buses 13a and 13b and between the bus-side disconnecting switch operating devices 22a and 22b. By the first and second
The circuit breaker maintenance grounding switches 30a, 30b are operated collectively. A control panel 34 for the line is provided below the second busbar unit 3.

* Operation of the embodiment * According to the gas insulated switchgear of the embodiment, the first and the second
When one or both of the main buses 13a and 13b are to be inspected by removing the circuit breaker 1 while keeping the live state, first open the first and second bus-side disconnectors 14a and 14b. , First and second grounding switch for circuit breaker maintenance
The circuit breaker 1 side terminals of the bus side disconnectors 14a, 14b are grounded by 30a, 30b. Then, the circuit breaker 1 is removed by separating the first and second busbar connecting terminal portions 8, 9 of the circuit breaker 1 and the insulating spacers 18a, 18b, respectively. As for the line-side equipment, the circuit-breaker 1 and the line-side disconnector 25 are opened beforehand, and the ground-side switches 27 and 28 are grounded, and the line-side unit 4 is separated by the line-side equipment outlet terminal 10. deep.

* Effects of Embodiment * As described above, in the circuit breaker maintenance work in this embodiment, even after the breaker is removed, the first and second grounding switches 30a, 30b for circuit breaker maintenance are connected to the bus-side units 2,3. And the first and second bus-side disconnectors 14
Since the circuit breaker 1 side terminals of a and 14b are grounded,
There is no danger of electric shock when working. Further, the first and second earthing switches 30a and 30b for circuit breaker maintenance can be commonly operated by one earthing switch operator 33, and the earthing work can be performed exactly as in the case of one earthing switch. .

Further, the first and second grounding switches 30a, 30b for circuit breaker maintenance are housed together with other bus-side devices in the first and second bus-side unit containers 16a, 16b, respectively. The configuration of the entire apparatus is simplified. In addition, in the circuit breaker container 6, only the circuit breaker 5, the branch conductor 11, and the connection conductor 12 of the circuit breaker are stored, and the circuit breaker maintenance ground switches 30a, 30b are also stored at the same time. , The circuit breaker container 6 is downsized. Further, the first and second
One of the ground switchgears 30a, 30b for circuit breaker maintenance is disposed between the first and second bus-side disconnector switches 22a, 22b. Since the panel 34 is disposed below the busbar side unit, the longitudinal dimension of the side surface of the gas insulated switchgear can be reduced as a whole.

* Other Embodiments * It should be noted that the present invention is not limited to the above-described embodiments, and may be configured as shown in FIGS. 3 to 6.
In FIGS. 3 and 4, on the side of the circuit breaker container 6 of the circuit breaker 1, first and second busbar connecting outlet terminals 35, 36 projecting in the same direction and arranged vertically in parallel. Provide. The two ends of the breaker 5 of the circuit breaker are led out to the first and second busbar connection terminal portions 35 and 36 by connection conductors 37 and 38, respectively. Furthermore, the same first and second bus-side units 2 and 3 as those shown in FIGS. 1 and 2 are respectively connected to the bus-bar outlet terminals 35 and 36, respectively.
And the first and second insulating spacers 18a or 18b may be arranged and connected between the current transformers 39a and 39b and the circuit breaker container 6.

In the gas insulated switchgear configured as described above,
When the circuit breaker 1 is removed and inspected while the main buses 13a and 13b are kept in a live state, the circuit breaker 1 is connected to the first and second insulating spacers 18a and 18b and the busbar connection terminal of the circuit breaker. What is necessary is just to separate and remove between the parts 35 and 36, and the same effect as the gas insulated switchgear shown in FIGS. 1 and 2 can be obtained in terms of safety and workability of maintenance work. or,
As for the overall size of the device, the longitudinal dimension of the side surface can be reduced as in the above-described embodiment.

5 and 6 are connected between one of the divided buses of the double bus as a first main bus 13a and the other as a second main bus 13b. Disconnector 1
4a, 14b, grounding switches 30a, 30b for circuit breaker maintenance,
The current transformers 39a and 39b and the circuit breaker 1 are configured in the same manner as the gas insulated switchgear of the bus connecting line shown in FIGS. 3 and 4.
Then, the circuit breaker 1 is placed on the gantry 40, and the entire unit is lifted so that the position of the second main bus 13b matches the position of the upper main bus in the line drop-in line, the bus connection line, and the like. And arrange them. However, the operating device 33 of the circuit breaker maintenance grounding switches 30a and 30b is arranged on the lower front surface of the second main bus 13b for easy operation. Further, another one of the double buses may be disposed between the second main bus 13b and the control panel 34 in parallel with the first and second main buses 13a and 13b. Also in this configuration, FIGS.
3, the same operations and effects as those of the gas insulated switchgear shown in FIG. 4 can be obtained.

In the gas insulated switchgear shown in FIGS. 3 to 6, the current transformers 39a and 39b are provided at both ends of the circuit breaker 1, but only one of the current transformers 39a and 39b is provided. It may be formed. At this time, the same configuration as described above can be achieved by configuring the side without the current transformer by the connection bus. 5 and 6 show the case of the double bus system, but in the case of the single bus system, one side of the divided bus is a first main bus 13a, and the other side is a first main bus 13a. In FIG. 3 and FIG. 4 as a second main bus 13b.
The configuration can be the same as that of the double bus type bus connection line. Further, the bus-side side of the double-bus system can also be configured identically by changing the line-side unit 4 of the cable-in line shown in FIG. 1 and FIG. And in all the above configurations,
With respect to safety, workability and overall dimensions of the circuit breaker during maintenance, the same operation and effects as those of the gas insulated switchgear shown in FIGS. 1 to 6 can be obtained.

[Effects of the Invention] As described above, according to the present invention, when a breaker is removed and inspection is performed, grounding work of the bus-side device need only be performed once by one operating device, and is always performed during operation. The circuit breaker-side terminal of the bus-side disconnector is grounded, so that maintenance work of the circuit breaker can be performed safely and efficiently. In addition, it can be configured with a minimum necessary container, and since the size of the busbar direction can be reduced by consolidating the operation devices, the size can be reduced and the installation space can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cut-away side sectional view of a gas insulated switchgear of a double-bus type cable service line showing an embodiment of the present invention. FIG. 2 is a gas insulated switchgear shown in FIG. FIG. 3 is a partially cut-away side sectional view of a gas insulated switchgear of a double bus type bus connecting line showing another embodiment of the present invention, and FIG. 4 is a single line diagram of FIG. FIG. 5 is a side view of a gas insulated switchgear of a double-bus system dividing line showing still another embodiment of the present invention, FIG. 6 is a single-line connection diagram of FIG. 5, and FIG. It is a side view of the conventional gas insulated switchgear of the double bus system cable service line. 1 ... Circuit breaker, 2,3 ... First and second bus-side units, 4
... Track side unit, 5 ... Breaker, 6 ... Circuit breaker container, 7 ... Circuit breaker mechanism box, 8, 9 ... First and second busbar connection outlet terminals of circuit breaker, 10 …… Line-side equipment connection terminal, 11 …… Branch conductor, 12 …… Connection conductor, 13a, 13b ……
1st, 2nd main bus, 14a, 14b ... 1st, 2nd bus-side disconnector, 15 ... Grounding switch for circuit breaker maintenance, 16a, 16
b: first and second bus-side units, 17a, 17b ... breaker connection terminals, 18a, 18b ..., first and second insulating spacers, 22a, 2
2b: first and second bus-side disconnecting device operation devices, 23: insulating spacer, 24: current transformer, 25: line-side disconnector, 26: cable head, 27: circuit breaker maintenance Ground switch for wiring, 28 ... Ground switch for grounding the track, 29 ... Unit container for track side, 30a, 30b ... Ground switch for maintenance of the first and second circuit breakers, 31a, 31b ... Second breaker maintenance grounding switch drive shaft, 32 ... Link, 33 ...
Grounding switch actuator, 34 ... Control panel, 35, 36 ... First and second
Terminals for busbar connection, 37, 38 ... Connection conductors, 39a, 39b
…… current transformer, 40 …… stand.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshihiro Kanno 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (56) References Real-life sho 59-15211 (JP, U) Sho 63-4610 (JP, U) Sho 63-10711 (JP, U)

Claims (1)

(57) [Claims] A first bus-side unit including a first main bus and a first bus-side disconnector; a second main bus and a second main bus;
And a second bus-side unit including a bus-side disconnector of the circuit breaker, and a gas dividing unit provided in each of the first and second outlet terminals of the circuit breaker arranged in the same direction perpendicular to the axis of the circuit breaker. And a gas insulated switchgear connected in parallel with the first and second busbar-side units.
First and second grounding switches are disposed between the circuit breaker side terminal of the second busbar side disconnector and the first and second circuit breaker outlet terminals, respectively. In the second grounding switch, a rotary drive shaft for driving each is arranged between the first and second bus-side units on the same axis parallel to the axis of the circuit breaker so as to face each other. A gas insulated switchgear, wherein a drive shaft is connected to one operating device via a pair of connecting links, and the operating devices are juxtaposed with the operating devices of the first and second bus-side disconnectors. .