JPH04156210A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE:To further miniaturize a device excellent in reliability and economical efficiency by arranging vertically two sets of main bus bars, connecting these bus bars by placing horizontally a bay unit, in which two or three units consisting of breakers, disconnecting switches, current transformers to serve as a principal equipment are provided in series, and forming a block made into a multilayer structure. CONSTITUTION:In the case of performing connection and disconnection to and from a power transmission line, the control is performed by on-off operating breakers 1 and disconnecting switches 2 of units A, B. Here, main bus bars 3 are vertically arranged in a central part, so that bushings 8 connected to overhead connection lines 6 can be provided in an end part of a device. Further, the main bus bars 3 are vertically arranged with only connection required between bay units of each layer, and in addition, the main bus bar 3 can be connected from its one part to the two or more bay units, so that a length of the main bus bar 3 is reduced by a factor of severals as compared with the length in the case of horizontal arrangement in the past, to reduce probability of generating trouble.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is a gas-insulated switchgear installed in transmission lines, substations, etc. It is related to.

[Prior art] Figure 5 shows, for example, Electric Kyodo Research, Vol. 39, No. 6,
Fig. 7-3 (a) is a single line diagram showing an example of the arrangement of the No. 1 CB type substation shown in (1982) (however, some units are omitted); Fig. 6 is a This is a diagram schematically showing the structure when a gas insulated switchgear is configured in the arrangement shown in FIG.
This figure shows the pay unit (the part indicated by M in FIG. 5).

In Figure 5, (1) is a circuit breaker, (2) is a disconnection/disconnection switch, and the units that are attached to these, such as a current transformer (not shown), are shown in (^), (B), and (C). These units (^) (B) (C) etc. are connected to the main bus (3), transmission line (4) or transformer (5) by connecting lines (6), (7).
connected via. This connection line (6), (7
), overhead lines, cables, or gas-insulated transmission lines are used.

In Figure 6, an overhead wire is used as the connection line (6), a bushing (8) is provided at the connection part of the gas insulated switchgear, and the connection line (7) is
) is an example in which a cable is used and a cable head (9) is provided. Other symbols in FIG. 6 that are the same as those in FIG. 5 refer to the same equipment and perform the same functions.

The gas insulated switchgear configured as described above, for example, when connecting/disconnecting with the power transmission line (4), the circuit breaker (1), disconnector (2) of the unit (^) (B) Enter/
Cut. To disconnect from the transformer (5),
Turn on/off units (B) and (C). To connect/disconnect from the main bus (3), turn on/off the unit (^) or (C). In this way, power transmission and substation are controlled by turning on and off each circuit. Compared to previous equipment that used insulators and air as the main insulation medium, gas-insulated switchgear has improved reliability because it is smaller due to the reduced insulation distance and is not affected by the outside world such as wind and rain. , making it possible to save labor in maintenance.

[Problems to be Solved by the Invention] The conventional 1', i CB type gas insulated switchgear was constructed as described above, so it is considerably smaller than the previous air insulated device. Because the main bus (3) is stacked horizontally and becomes long, the overall area required is still quite large.In order to construct a substation inside a building or underground in an urban area, a layout configuration with a further reduced floor area is required. is required.

This invention was made in order to solve these problems, and aims to provide a gas-insulated switchgear with a new layout configuration that is further downsized, requires less floor space, and is highly reliable and economical. shall be.

[Means for solving the problem] Gas insulated switchgear according to the present invention! In this method, two sets of main busbars are arranged vertically, and a bay unit consisting of two or three units in series with circuit breakers, disconnectors, and current transformers as main equipment is placed horizontally between them and connected. Blocks having a multilayer structure are formed and a required number of these blocks are used.The first invention forms a phase-separated type, and the second invention forms a three-phase all-in-one type.

[Function] Since the present invention is configured as described above, the main bus bar becomes extremely short, and the entire device is miniaturized.

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIG.
In the figure, all the equipment and units indicated by symbols (1) to (9) have the same names as in Figures 5 and 6, and play the same role. FIG. Therefore, in the case of a phase-separated type gas insulated switchgear, the structure for one phase in the single wire connection shown in Figure 5 is schematically shown, and in the case of a three-phase type, a gas insulated switchgear with such a configuration is shown schematically. Two more pieces (not shown) are arranged, making a total of three pieces.

Here, the overhead connection wires (6) and bushings (8) are insulated by air and require a considerable insulation distance, so arranging such blocks for three phases will reduce the separation distance between the bushings. It is convenient and can be obtained conveniently. In addition, between the upper and lower bushings (8), sufficient closure can be obtained by protruding one side slightly with the connection busbar (]O). Although it is arranged vertically, it is connected to the overhead connection line (6
The main busbar (3) is arranged vertically, and the main busbar (3) is arranged vertically, making it possible to provide a bushing (8) at the end of the device, which is advantageous for connection and insulation. Since it is possible to connect multiple bay units from one place on the main bus (3), the length of the main bus is longer than that of a conventional horizontal layout! The length is reduced to a fraction of the length in the case of a vertical bus, reducing the probability of failure.Furthermore, if a grounding wire mesh or the like is installed at the bottom of the vertical busbar to create an electric field reduction section, it will reduce the amount of gas in the gas that reduces insulation performance. Since minute gold winglets can be collected, reliability is improved and it is also economically advantageous. Furthermore, the required bottom area becomes extremely small, and the required volume is significantly reduced with almost no dead space.

The above gas insulated switchgear according to the present invention is most suitable for substations in urban areas where land prices are high, and is especially effective when constructing a substation inside a building or basement for environmental harmony. In substations and underground substations, since cables are installed on power lines, there is no need for the air insulation distance required for bushings, and the reduction in size of the switchgear itself is a direct effect. It is more economical to do so, and the gas insulated switchgear of the present invention meets this requirement.

FIG. 2 is an external perspective view of another embodiment, and the reference numerals in the figure refer to the same devices as those shown in FIG. 1 and have the same functions. (11) is a current transformer. The gas insulated switchgear shown in this figure is a three-phase finger type, and three-phase charging parts are housed in a single container.

However, the bushing section for connection to overhead lines requires three-phase separation. If the overhead line is pulled out using the bushing (8) in this way, the reduction effect of the gas-insulated WIwg device will be diminished, but it is common for the line to be led into the city center using an underground cable, and the bushing (8) is connected to the couple head (9). Therefore, the effect of reducing the size of the switchgear is large.

35th! i is an example of another conventional 1b type substation, which has a bus segmentation unit (BS) in the center of the main bus (3),
The codes in District 0, which are two large-scale substations, are shown in Figure 5.
Indicates the same equipment as shown.

FIG. 4 is a schematic diagram showing another embodiment in which the gas insulated switchgear according to the present invention is applied to the substation shown in FIG. 3. The symbols in section 0 are the same equipment as shown in FIG. shows,
In this example, which performs the same action, (^) (B) (C)
Beille consisting of 3 units, 1jll consisting of 2 sets of knits, 2 units (^) (B) and connecting conductor (l).
Two blocks are constructed by connecting two sets of bay units (2111) with a main busbar (3), and a busbar segmentation unit (BS) is connected between the main busbars (3) of each block.
The structure is connected by In large-scale substations like this, busbar segmentation units (BS) are often installed, but instead of busbar segmentation units, connecting conductors (BS) are often installed.
0) may be used to connect. In such a case,
The substation may be expanded by extending the main bus (3) of one block vertically and connecting adjacent blocks or units to that part to form a multi-layer system.

[Effects of the Invention] As described above, according to the present invention, two or three units including circuit breakers, disconnectors, current transformers, etc. are arranged in series between two vertically arranged main buses. Since the bay unit is composed of blocks connected in a horizontal multilayer arrangement, the main bus bar is extremely short, and the required floor area of the equipment is significantly reduced.
Performance and reliability have also improved. These advantages are especially effective for substation construction in urban areas, and can make a significant contribution.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of the present invention;
Figure 2 is a perspective view showing the external appearance of another embodiment, Figure 3 is a single line diagram of a conventional substation, and Figure 4 schematically shows another embodiment applied to the one in Figure 3. FIG. 5 is a single line diagram of a conventional substation of the 1 and CS systems, and FIG. 6 is a perspective view schematically showing the configuration of a typical part of FIG. (1)...Breaker, (2)...Disconnector, (3)
・・Main bus bar, (8) ・・Bushing, (9) ・・Cable head, (6) ・・Main bus bar, (L,) ~ (L
)...Transmission line unit, (lO)...Connection conductor, (N
)...Bay unit. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a phase-separated type gas-insulated switchgear, two main buses are installed vertically, and two or three units are connected in series with circuit breakers, disconnectors, and current transformers as main equipment. A multi-layered block is created by connecting a plurality of bay units horizontally between the two vertical main busbars. and a gas insulated switchgear, characterized in that one phase is formed by a structure in which the circuit breaker, the disconnector, and the current transformer are connected by any one of bus bar division units arranged in series as main devices. (2) In a three-phase all-in-one type gas-insulated switchgear, two main buses are installed vertically, and two or three units are connected in series with circuit breakers, disconnectors, and current transformers as main equipment. A multilayered block is created by connecting a plurality of bay units horizontally between the two vertical main busbars, and one block or a plurality of bay units are connected to each other between the busbar and the main busbar. A gas-insulated switchgear characterized in that the entire three-phase structure is formed by connecting a circuit breaker, a disconnector, and a current transformer as main devices by any of bus bar division units arranged in series.