JPS6360602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low pressure gas insulated switchgear, and its object is to provide an economical and downsized device of this type.

As shown in Figure 1, when insulating a power receiving substation facility with voltage and current transformation for demand and supply between multiple power receiving lines and a transformer with gas insulation, the arrangement shown in Figure 2 is adopted. It was normal. In these figures, CHd is the cable head or bushing ESW ₁ to ESW ₄ is the earthing switchgear, DS ₁ to _{DS 3} is the disconnector, LA is the lightning arrester, CB is the gas shield or disconnector, B is the transformer connection bushing, and T is a transformer, CT ₁ is a current transformer, BUS ₁ and BUS ₂ are the first and second buses for connection, and a voltage-current transformer MOF for supply and demand is connected between these buses.
is connected. Note that 1 and 2 are first and second power receiving units constructed of these, and 3 and 4 are first and second transformer primary units.

Each component was housed in a cylindrical container filled with an insulating gas such as SF ₆ gas at high pressure, and these were successively connected to form a gas insulated switchgear as shown in FIG. Then, the first bus BUS 1 that connects the power receiving units _{1 and 2} and the second bus BUS ₂ that connects the transformer primary units 3 and 4 are arranged separately, and a voltage-current transformer MOF for demand and supply is installed between them. It was normal to have them installed. FIG. 2 shows an example of bushing power reception. A structure as shown in FIG. 3 is used to connect the transformer MOF and the first and second bus lines BUS ₁ and BUS ₂ .

In the figure, 5, 6, 7, and 8 are current transformers and transformers of the voltage/current transformer MOF for supply and demand. The former is inserted between the A-phase conductors 11A and 12A and the C-phase conductors 11C and 12C of the first and second buses BUS ₁ and BUS ₂ via reciprocating conductor bushings 9 and 10. Further, the transformers 7 and 8 are connected to the bushings 9 and 10 and other single conductor bushings 13 to the phase conductors 11A to 11C and 12A to 12C of both the busbars.
connected via. Note that 14 is a connection bus of the transformer MOF.

Such a conventional configuration has the drawback of not only being uneconomical due to the large number of parts, but also requiring a large amount of installation space for the device.

The present invention solves the above drawbacks by housing the components in a box-shaped container filled with insulating gas at low pressure. This will be explained with reference to FIG.

FIG. 4 is a plan view showing one embodiment of the present invention, in which U ₁ and U ₂ are power receiving units;
U ₃ and U ₄ are transformer primary units. The units U ₁ and U ₃ , U ₂ and U ₄ are box-shaped containers 2, respectively.
Each component device is housed in 0.

That is, as shown in FIG. 5, the container 20 is box-shaped and has a rectangular bottom plate 20a, side plates 20b to 20e arranged along the periphery of the rectangular bottom plate 20a, and a ceiling plate 20f. _. ^_
It is filled with low pressure of less than g.

The cable head CHd, lightning arrester LA, disconnector DS ₁ and grounding device ESW ₁ are installed in the disconnector room 21, and the disconnector DS ₂ , gas disconnector CB,
The earthing devices ESW ₂ , ESW ₃ , current transformer CT ₁ , disconnector DS ₃ , earthing device ESW ₄ , bushing B, etc. are installed in the unit room 23 in the X-axis or Y-axis direction (in the figure, the X-axis direction ), the in-phase components are arranged in almost the same plane, and the three-phase components are arranged parallel to each other (in the Z-axis direction in the figure). The shield breaker CB is a gas shield filled with insulating gas under high pressure, and its interior is gas-wise separated from the chamber 21.

The operation mechanism of each component device is the bottom plate 2 of the container 20.
0a, and is connected to an operating device (not shown) disposed between the bottom plate 20a and the base 25. Further, the grounding wire of the lightning arrester and other electrical lead wires also pass through the bottom plate 20a and are led to an equipment box (not shown) disposed between the bottom plate 20a and the base 25.
The bottom plate 20a is raised from the base 25 by a frame 26, and the space between the two is covered with a decorative board 27 as required.

The breaker chamber 21 configured as described above has first and second busbars for connecting to other units.
BUS ₁ and BUS ₂ are provided. This bus line
BUS ₁ and BUS ₂ are arranged in a direction perpendicular to each equipment arrangement (Z-axis direction in the figure), and as shown in part in Fig. 6, they correspond to at least two or more phases, for example, A and C phases. each phase conductor 11A and 12A,
11C and 12C are respectively constructed as reciprocating conductors arranged coaxially. This reciprocating conductor, for example conductor 11
A and 124 have a coaxial structure via an insulator (not shown), etc., but they do not necessarily have to be coaxial, and a flexible conductor (CV cable etc. may also be used) coated with insulation may be used as the inner conductor. can.

One end of the conductor of each phase is insulated and supported by insulating spacers 28A to 28C attached to the side plate 20C, and passes through the side plate 20C. The other end is a disconnector D
Auxiliary busbars 29A to 29C attached to each phase of 2
Support is connected to. Of course, the other end of the reciprocating conductor may be extended and an insulating spacer may be attached to the side plate 20C for support.

Conductors 11A and 12A, 11B11C of each phase
and 12C are arranged in a direction of approximately 45° with respect to the
It is directly opposed to the intermediate surface made up of the upper surface made up of the side plate 20f, etc.).

The inner conductors 12A to 12C of the reciprocating conductor are branched by branch conductors 30A to 30C, and a disconnector DS ₃
are connected to one end of each. The branch conductors 30A to 30C are insulated and supported on the partition plate 20i by insulating spacers 31A to 31C.

The first and second bus bars BUS ₁ and BUS 2 led out from the side plate 20C of the power receiving unit U 1 are connected to the first bus bar BUS ₁ and BUS ₂ led out from the corresponding side plate of the power receiving unit U ₂ insulated.
and second bus bars BUS ₁ and BUS ₂ , and a bus bar container 32 filled with insulating gas 24 at low pressure as shown in FIG.
They are connected within each other.

Further, as shown in FIG. 4, a supply and demand voltage/current transformer MOF is disposed between the power receiving units U ₁ and U ₂ . As shown in Fig. 7, this transformer includes reciprocating conductor bushings 9 and 10, and single conductor bushing 1.
It has 3. In addition, both the power receiving units U ₁ ,
Extension _{conductors 33A 1 , 33A 2 ,}
33B, 33C ₁ and 33C ₂ are derived, and the connection part 3
4A to 34C are connected to corresponding bushing conductors, respectively. The extension conductors 33A ₁ and 33A ₂ and 33C ₁ and 33C ₂ are formed as reciprocating conductors.

Said bus lines BUS ₁ and BUS ₂ , auxiliary bus lines 29A~
29C, branch conductors 30A to 30C, extension conductor 33
The electric diagram of A ₁ to 33C ₂ is schematically shown in FIG. 8.

In the above configuration, power is transmitted from the power receiving unit U ₁ or U ₂ to the transformer primary unit U ₃ or U ₄ via the demand/supply voltage/current transformer MOF, and the transformer MOF measures the power supply and demand without any problems. can.

Note that each component in the power receiving units U ₁ and U ₂ and the transformer primary units U ₃ and U ₄ may be increased or decreased as necessary.

In addition, the power receiving unit and the corresponding transformer 1
The following units may be stored together in the same container.
With this configuration, the device can be made smaller.

In the above configuration, in a two-line power reception two-transformer configuration in which a voltage-current transformer for supply and demand is inserted between a bus for connecting the power receiving unit and a bus for connecting the primary unit of the transformer, the reciprocating conductor is inserted between the two buses. Since the structure is integrated, the number of parts can be halved, making it extremely economical, and the bus bar space can also be halved, allowing for a significant downsizing of the device. In addition, the power receiving unit and transformer 1
It is possible to arrange the next unit adjacently, and the device can be further downsized and simplified. Furthermore, when using the pipe conductor conventionally used as the outer conductor of the reciprocating conductor, it is sufficient to arrange another conductor coaxially inside the pipe conductor, and the basic design of the conventional product (shape of insulating spacer, conductor size, The present invention can be easily applied without changing the dimensions (size, shield diameter, etc.).

In the above explanation, a 2-line power receiving unit with 2 transformers is used, but a 3-line power receiving unit with 2 transformers or other configurations may also be used.Alternatively, the power receiving unit may be directly connected and the voltage/current transformer for supply and demand may be placed on the outermost side of the power receiving unit. It goes without saying that it may also be arranged upside down. In short, a reciprocating conductor composed of a first bus bar and a second bus bar may be disposed across a plurality of power receiving units arranged in parallel, and a voltage/current transformer for supply and demand may be connected between the bus bars.

As described in detail above, according to the present invention, the first and second busbars constitute a return conductor, and the voltage and current transformer for supply and demand is connected to this, so the number of parts can be reduced and the space of the busbars can be reduced. Since the power receiving unit is constituted by a box-shaped container filled with insulating gas at low pressure, it is possible to provide a low-pressure gas insulated switchgear that has an elegant appearance and efficiently utilizes space.

[Brief explanation of the drawing]

Figure 1 is a single-line connection diagram of a two-line power receiving and two-transformer configuration, Figure 2 is a plan view of a conventional device that is gas insulated from the one in Figure 1, and Figure 3 is the connection between the voltage and current transformer for supply and demand and the bus bar. FIG. 4 is a plan view showing one embodiment of the present invention, FIG. 5 is a simplified side sectional view of the power receiving unit and transformer primary unit of FIG. 1, and FIG.
The figure is an enlarged cross-sectional view of the bus bar in Figure 5, and Figure 7 is a cross-sectional view of the connection between the bus bar and the voltage/current transformer for demand and supply.
FIG. 8 is a schematic electrical diagram showing a state of branching from the bus bar. BUS ₁ , BUS ₂ ... 1st, 2nd bus bar, U ₁ , U ₂ ...
...power receiving unit, U ₃ , U ₄ ... transformer primary unit, MOF ... voltage and current transformer for demand and supply, 20 ...
box-shaped container.

Claims (1)

[Scope of Claims] 1. A box-shaped container filled with insulating gas at low pressure that houses a shingle disconnector, a disconnector, a grounding device, etc., and a plurality of power receiving units arranged side by side, and a corresponding transformer primary unit. are arranged close to each of the power receiving units, and at least two phases of three-phase conductors of a first bus connecting the plurality of power receiving units and a second bus connecting the plurality of transformer units are used as reciprocating conductors. A low-pressure gas insulated switchgear, characterized in that the power receiving units are arranged substantially coaxially across the plurality of power receiving units, and a demand and supply voltage/current transformer is connected between the conductors of the bus bar. 2. The low-pressure gas insulated switchgear according to claim 1, wherein the power receiving unit and the corresponding transformer primary unit are each arranged collectively in one box-shaped container.