JPH0226162Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas-insulated switchgear installed in electrical stations such as substations.

[Prior art] In general, in gas-insulated switchgear, the phase order on the receiving side (power source side) is determined by the standards of the electrical station, and the phase order on the load side (output side) is determined by the transformer connected to the load side. Determined by the configuration of Therefore, it is preferable that the phase order on the power receiving side and the load side of the gas insulated switchgear can be changed as appropriate depending on the configuration of the electric station and the configuration of the transformer.

By the way, recently, the three-phase equipment necessary for the configuration of the switchgear was filled with low-pressure SF ₆ gas that did not exceed the pressure (2 Kgf/cm ² ) applicable to the regulations for Class 2 pressure vessels at the maximum operating temperature. An improved type of gas insulated switchgear is attracting attention because it is housed in a common container to simplify the configuration and reduce the installation area.

Among this type of gas insulated switchgear, the gas insulated switchgear installed between the line and the transformer generally consists of a power receiving unit placed on the line side and a transformer unit placed on the transformer side. be done.

The power receiving unit includes first to third power receiving cable heads or bushings into which three-phase cables or overhead lines are drawn, first to third busbars, and first to third cable heads or bushings, respectively. and devices constituting the first to third power reception switching circuits connected to the first to third busbars. Further, the transformer unit is composed of first to third conductors and equipment constituting the first to third transformer connection switching circuits for connecting the first to third conductors to the transformer. The components of these units are housed in a common container filled with insulating gas. The first to third busbars and the first to third conductors are made to correspond to the power receiving side and the load side in a predetermined combination according to the phase order, and the corresponding busbars and conductors are connected via the connecting conductor. Connected.

[Problem that the invention aims to solve] However, in this type of conventional gas-insulated switchgear, if it is possible to change the phase order inside the container, it is necessary to prepare a connecting conductor with a complicated twisted shape. Moreover, it was necessary to use connecting conductors of different shapes for each different phase order. Therefore, there were problems in that the number of connection conductors that needed to be prepared increased, and the processing of each was troublesome, resulting in high costs.

It is also possible to manufacture connecting conductors in a predetermined shape each time it becomes necessary to change the phase order, but in this case, it would take time to change the phase order, and the process from ordering to delivery of the equipment would be delayed. The problem arises that the period becomes longer.

Furthermore, in order to be able to arrange three-phase connecting conductors with complicated shapes while ensuring a predetermined insulation distance between them, it is necessary to secure a large space around the connecting conductors. However, there was a problem that the container became larger.

An object of the present invention is to provide a gas-insulated switchgear that can easily perform phase conversion inside a container without forming a connecting conductor into a complicated twisted shape.

[Means for Solving the Problems] The present invention provides a connection between the first to third power receiving cable heads CHa to CHc or bushings, the first to third busbars BUSa to BUSc, and the first to third power receiving cable heads CHa to CHc or bushings.
a power receiving unit Ur comprising devices constituting first to third power receiving switching circuits that connect the cable heads or bushings of 64 to the first to third busbars, respectively, and first to third conductors 64 to 66 and a device constituting a first to third transformer connection switching circuit for connecting the first to third conductors to the transformer.
Ut is housed in a common container 1 filled with insulating gas, and the first to third busbars BUSa to BUSc
and the first to third conductors 64 to 66 are associated with each other in a predetermined combination, and the corresponding busbars and the conductors are connected via connecting conductors 81 to 83. It is.

In the present invention, devices constituting the first to third power receiving switching circuits and the first to third plane
It is located almost along Pa or Pc.

The first to third generating lines BUSa to BUSc have their respective axes aligned with the first to third planes Pa to BUSc.
They are arranged in a state perpendicular to the PC, and are arranged sequentially in a diagonally upward direction from the transformer unit side to the power receiving unit side. The first to third busbars are connected to the first to third power receiving switching circuits, respectively.

The first to third conductors 64 to 66 extend along the first to third planes Pa to Pc, respectively, at the same height as the third bus bar BUSc, which is the highest among the first to third bus bars. It is arranged like this.

Conductor connection portions 50A to 50C, 51A to 50C, and 52A for connecting the connection conductors to positions intersecting the first to third planes Pa to Pc of the first to third busbars BUSa to BUSc, respectively.
~52C is provided.

[Function] As described above, the first to third conductors 64 to 66 connected to the first to third transformer connection switching circuits are connected to the highest of the first to third busbars arranged diagonally. along the first to third planes Pa to Pc at the same height as the third generating line BUSc,
Conductor connection parts 50A to 50C, 51A to 50C for connecting the first to third connection conductors to positions intersecting the first to third planes Pa to Pc of the first to third bus lines BUSa to BUSc, respectively.
By providing 52A to 52C, it is possible to easily perform phase conversion within the container by simply preparing three connecting conductors with a simple shape, without forming the connecting conductors into a complicated twisted shape. Can be done. That is, two L-shaped conductors are used as connection conductors, one end of which is connected to the conductor connection portion of the first busbar and the second busbar, and a connection conductor whose one end is connected to the conductor connection portion of the third busbar. By preparing one linear conductor for each, phase conversion can be performed arbitrarily within the container.

As described above, according to the present invention, since a connecting conductor with a complicated shape is not used, it is possible to reduce the space for the part where phase conversion is performed, and it is possible to reduce the size of the container.

Furthermore, since it is only necessary to prepare three types of connection conductors, it is possible to standardize parts and reduce costs.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the present invention, and in these figures, numeral 1 represents a container having an airtight structure. The container 1 is formed in the shape of a rectangular parallelepiped, and is fixed on an operating device box 3, which is also formed in the shape of a rectangular parallelepiped and installed on a base 2. The length of the operating device box 3 is set shorter than the length of the container 1, and a space 4 for pulling a cable is formed below one end of the container 1, and this space is covered with a cover 5. Doors 3A and 3B are attached to the front and back surfaces of the operating device box 3, respectively, and by opening these doors, the operating devices inside the operating device box can be operated and inspected.
The inside of the container 1 is partitioned into a first chamber 8 to a third chamber 10 by partition walls 6 and 7, and the bottom of the first chamber 8 located at one end of the container 1 is hermetically penetrated to form a first chamber 8.
or a third cable head CHa or CHc is installed.

Although each piece of equipment is shown in Figure 1 one by one, in reality three pieces of each piece of equipment (for three phases) are provided and are arranged in a predetermined direction perpendicular to the plane of the figure (horizontal direction). They are placed side by side at intervals.

First to third cable head CHa or
The lower ends of CHc are exposed in the space 4, and connectors 12 attached to the ends of phase A or C cables 11 rising from underground cable bits are removably inserted into these cable heads. A current transformer CT is disposed within the space 4 to allow the cables of each phase to pass through, and the current transformer is supported by the side wall of the operator box 3.

Also housed in the first chamber 8 in the container 1 are disconnectors DS1a to DS1c and grounding devices ES1a to ES1c, which are connected to the first to third cable heads, respectively, and grounding devices ES1a to ES1c.
The disconnectors DS1a to DS1c are supported on the partition wall 6, and the grounding devices ES1a to ES1c are supported on the bottom wall of the container 1, respectively. Disconnector DS of this example
1a to DS1c are linear displacement type movable contacts 1
3 and the fixed contact 14 are connected to a V-shaped insulating support 15.
The fixed contact 14 is connected via a connecting conductor 16 to the corresponding cable head. The operating portion of the movable contactor 13 is connected to a disconnector operating device 17 provided in an operating device box via a link mechanism (not shown) or the like. earthing device
ES1a to ES1c consist of a linear displacement type movable electrode 18 supported on the bottom of the container 1 and a fixed electrode 19 provided on the fixed contact 14 of the disconnector DS1a to DS1c, and the operating part of the movable electrode 18 is not shown. It is connected to the grounding device operating device 20 in the operating device box via a link mechanism or the like.

Inside the second chamber 9 in the container 1 are first to third circuit breakers CBa to CBc, disconnectors DS2a to DS2c connected to these circuit breakers, and a grounding device ES.
2a to ES2c and ES3a to ES3c are stored side by side, respectively. circuit breaker
CBa or CBc is an insulating container 2 filled with SF ₆ gas
These circuit breakers are supported at the bottom of the container 1, and each operating section 22 is connected to a circuit breaker operating device 23 disposed in an operating box. There is. The grounding devices ES2a to ES2c and ES3a to ES3c are the fixed side and movable side terminal parts 2 of the circuit breakers CBa and CBc, respectively.
Fixed electrodes 26 and 27 connected to 4 and 25
and rotating movable electrodes 28 and 29 supported by a frame (not shown), and these movable electrodes of the grounding device are connected to a grounding device operating device 30 in the operating device box by a link (not shown). There is.
The disconnectors DS2a to DS2c each consist of a linear displacement type movable contact 31 and a fixed contact 32 supported on a V-shaped insulating support 33, and are supported at the bottom of the container 1, and the movable contact 32 is supported on a V-shaped insulating support 33. The operating section is connected to a disconnector operating device 34 in the operating device box by a link mechanism (not shown) or the like. disconnector
The fixed contacts 32 of the DS2a to DS2c are connected to the movable side terminal portion 25 of the corresponding circuit breaker via a flexible Z-shaped connecting conductor 35. Fixed side terminal part 2 of each circuit breaker CBa or CBc
4 is connected via a connecting conductor 36 to the movable contacts 13 of the disconnectors DS1a to DS1c.

The first to third circuit breakers CBa and CBc are the first to third power receiving cable heads, respectively.
These circuit breakers, disconnectors DS1a to DS1c and DS2a to DS2c, and grounding devices ES1a to ES1c and ES3a to ES3c connected to these circuit breakers, respectively, are installed at positions corresponding to CHa to CHc. First to third switching circuits for power reception are arranged between the third cable heads CHa to CHc and first to third busbars to be described later, respectively. and the first to third cable heads.
CHa to CHc and the first to third power receiving switching circuits are arranged substantially along first to third planes Pa to Pc parallel to the longitudinal direction of the container 1, respectively.

Third circuit breaker CBc in the second chamber 9 part of the container 1
Three openings are formed in the side wall of the power supply, arranged in sequence in a diagonally upward direction from the transformer side to the power receiving side, and these openings are closed airtightly. Insulating spacer 41 to 4
3 is installed. The insulating spacers 41 to 43 have conductors 44 to 4 constituting a part of the first to third busbars BUSa to BUSc, respectively.
6 are supported, and conductors 50 to 52, which also constitute first to third busbars, are connected to these conductors 44 to 46, respectively. conductor 50
to 52 extend within the container at right angles to the planes Pa to Pc to at least a position where they intersect with the first plane Pa, and at positions where they intersect with the first to third planes of the conductor 50, there are conductors to which conductors can be connected from above, respectively. Connection portions 50A to 50C are provided. Also, the first to third planes Pa to Pc of the conductor 51
Conductor connection parts 51A to 51C to which the conductor can be connected from above are provided at the positions where they intersect, respectively.
Conductor connecting portions 52A to 52C are provided at positions intersecting the first to third planes Pa to Pc of the conductor 52, respectively, to which the conductors can be connected from the lateral direction. Insulating spacers 41 to 43 as described above
are arranged diagonally, so the bus line BUSa
The conductors 50 to 52 constituting each of the BUSc are arranged diagonally in the same manner as the insulating spacers 41 to 43.

Conductor 50 and disconnector constituting the first bus bar BUSa
A conductor 53 connects the movable contact of DS2a to the second bus line BUSb and the third bus line BUSc.
conductors 51 and 52, respectively, and a disconnector.
The movable contacts of DS2b and DS2c are connected by conductors 54 and 55, respectively.

The first to third cable heads CHa to CHc, circuit breakers CBa to CBc, and disconnecting switch DS1
a to DS1c, DS2a to DS2c, earthing device ES1a to ES1c, ES2a to ES2
c, ES3a or ES3c and bus line BUSa or
The power receiving unit Ur is configured by BUSc.

At the top of the partition wall 7 there are first to third planes Pa.
Three openings lined up in a direction perpendicular to Pc are provided, and insulating spacers 61 to 63 are attached to airtightly close these openings.
First to third conductors 64 to 66 are supported by the insulating spacers 61 to 63, respectively, and these conductors are connected to the third bus bar located at the highest position.
It is arranged along the first to third planes Pa to Pc at the same height as the conductor 52 constituting the BUSc.

The third chamber of container 1 is equipped with a disconnector DS3a or
DS3c and grounding devices ES4a to ES4c are arranged along the first to third planes, and the container 1
A three-phase gas-hydraulic bushing 70 connected to a transformer (not shown) is connected to the lower part of the end wall facing the third chamber 10. Disconnector DS3a or
The DS3c is constructed similarly to other disconnectors, and the movable contacts of these disconnectors are connected to first to third conductors 64 to 66 supported by the insulating spacers 61 to 63, respectively. Further, the fixed contacts of the disconnectors DS3a to DS3c are connected to conductors 74 to 76 (conductor 76 not shown) of the bushing 70 via conductors 71 to 73 (conductor 73 not shown), respectively. The grounding devices ES4a to ES4c include a movable electrode 77 supported by a frame (not shown) and conductors 71 to 76.
and a fixed electrode 78 connected to the disconnector.
The operating sections of DS3a to DS3c and earthing devices ES4a to ES4c are respectively connected to a disconnector operating device 79 and a grounding device operating device 80 in the operating device box.

The first to third busbars BUSa to BUSc and the first to third conductors 64 to 66 are made to correspond to each other in a predetermined combination, and the corresponding busbars and conductors are connected via connection conductors 81 to 83. Ru.

In this example, the phase order is different between the power receiving side and the load side (transformer side), so the conductor 6
4 is connected to the conductor connection portion 52A of the conductor 52 via a rod-shaped connection conductor 81 and a flexible Z-shaped connection conductor 48. Further, the conductor 65 is connected to the conductor connection portion 51 of the conductor 51 via the L-shaped connection conductor 82.
The conductor 66 is connected to the conductor connection portion 50C of the conductor 50 via the L-shaped connection conductor 83.

The above disconnectors DS3a to DS3c and grounding device
A first for connecting the first to third conductors 64 to 66 to the transformer by means of ES4a to ES4c.
or a third transformer connection switching circuit is configured,
These switching circuits, the first to third conductors 64 to 66, and the gas-oil division bushing 70 constitute a transformer unit Ut.

As in the above embodiment, the busbar BUSa or
The conductors 50 to 52 constituting the BUSc are arranged at different heights, and the first to third conductors 64 to 66 connected to the first to third transformer connection switching circuits are placed at the highest position. If the first to third
The bus bar and the first to third conductors can be arbitrarily connected, and phase conversion can be easily performed.

For example, in the above embodiment, if the phase order on the transformer side is the same as the phase order on the power receiving side, the connecting conductor 8
2 is left as is, and the first conductor 64 and bus bar BUSa
The L-shaped connecting conductor 83 connects the conductor 50 constituting the conductor connecting portion 50A. Further, the third conductor 66 and the conductor connecting portion 52C of the conductor 52 constituting the bus bar BUSc are connected by a rod-shaped connecting conductor 81 and a Z-shaped connecting conductor 48.

In addition, if necessary, the first conductor 64 and the conductor 51
The second conductor 65 and the conductor connecting portion 50B of the conductor 50 are connected by the connecting conductor 83, and the third conductor 66 and the conductor 52 are connected by the connecting conductor 82. It is also possible to connect the portion 52C with the rod-shaped connecting conductor 81 and the Z-shaped connecting conductor 48, respectively.

Furthermore, the conductor connection portion 5 between the first conductor 64 and the conductor 51
1A by the connecting conductor 82, the second conductor 65 and the conductor connecting portion 52B of the conductor 52 by the rod-shaped connecting conductor 81 and the Z-shaped connecting conductor 84, and the third conductor 66 and the conductor 50. It is also possible to connect with the conductor connecting portion 50C by an L-shaped connecting conductor 83.

In addition, as in this embodiment, the bus line BUSa or BUSc
The first to third conductors 50 to 52 constituting the
By providing conductor connection portions at positions that intersect planes Pa to Pc, it is possible to standardize these conductors 50 to 52.

The container 1 is filled with SF ₆ gas at a pressure that does not exceed the pressure applicable to the second class pressure vessel regulations at the maximum operating temperature. Also the third
Gas is separated by a partition wall 7 between the chamber 10 and other chambers (between the power receiving unit and the transformer unit).

A single line diagram showing the electrical configuration of the above embodiment is shown in FIG. 4, where T indicates a transformer.

In the above embodiment, the busbar BUSa or
When a power supply and demand instrument transformer (MOF) is connected to the BUSc, a reciprocating conductor is usually used as the conductor constituting the bus bar. In this case, to connect the connecting conductors 81 to 83 to the inner conductor of the reciprocating conductor, for example, as shown in FIG. A flat part is formed in a part of the inner conductor 92, and a terminal plate 93 and a shield 94 are attached to the flat part with bolts 95. And Z to the terminal board 93
The connecting conductors 81 to 83 are connected via a letter-shaped flexible connecting conductor 96.

The above-mentioned Z-shaped connecting conductor is made flexible by stacking and integrating multiple conductive plates, and when a flexible connecting conductor like this is used at the connection part of a device, the Since dimensional errors between devices can be absorbed by the connecting conductor, assembly of the device can be facilitated.

In the above embodiment, power is received by a cable head, but it goes without saying that the present invention can also be applied to a case where power is received by a bushing. In this case, in the example shown in Fig. 1, an opening 97 is provided in the ceiling of the container 1, and a bushing can be connected to this opening. It is designed to be airtightly closed by a blind lid 98. Furthermore, if necessary, a lightning arrester can be installed through the opening 97.

[Effects of the invention] As described above, according to the invention, the first to third conductors connected to the first to third transformer connection switching circuits are connected to the diagonally arranged first to third conductors. The first to third planes of each of the first to third generating lines are arranged at the same height as the third generating line, which is the highest among the generating lines. 3 plane Pa
Since a conductor connection part for connecting the first to third connection conductors is provided at the position where it intersects with Pc,
There is an advantage that phase conversion can be easily performed within the container by simply preparing three connecting conductors with simple shapes without forming the connecting conductors into a complicated twisted shape.

Further, since a connecting conductor with a complicated shape is not used, the space for the phase conversion part can be reduced, and the container can be made smaller.

Furthermore, since it is only necessary to prepare three types of connection conductors, there is an advantage that standardization of parts can be promoted and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of the container shown in FIG. 4 is a single line diagram showing the electrical configuration of the same embodiment, and FIG. 5 is an example of the connection between the bus bar and the connecting conductor when a reciprocating conductor is used for the bus bar. FIG. 1...Container, 2...Control box, CHa or
CHc...Cable head, DS1a or DS1
c, DS2a or DS2c, DS3a or DS3
c...Disconnector, ES1a or ES1c, ES2a or ES2c, ES3a or ES3c, ES4a or ES4c...Grounding device, CBa or CBc...
Circuit breaker, BUSa or BUSc...Bus bar, 50 to 52...Conductor constituting the bus bar, 81 to 83
...Connecting conductor.

Claims (1)

[Scope of claims for utility model registration] First to third power receiving cable head CHa
~First to third switching circuits for power reception that connect CHc or bushings, first to third busbars BUSa or BUSc, and said first to third cable heads or bushings to said first to third busbars, respectively. a power receiving unit Ur comprising equipment constituting a power receiving unit Ur, first to third conductors 64 to 66, and first to third transformer connections for connecting the first to third conductors to the transformer. A transformer unit equipped with equipment that constitutes a switching circuit for
Ut is housed in a common container 1 filled with insulating gas, and the first to third busbars BUSa to BUSc
and the first to third conductors 64 to 66 are matched in a predetermined combination, and the corresponding busbars and the conductors are connected via connection conductors 81 to 83, wherein: The devices constituting the first to third switching circuits for power reception and the devices constituting the first to third switching circuits for connecting transformers are approximately parallel to the first to third planes Pa to Pc, respectively. arranged along the first to third bus lines BUSa to BUSc;
are the respective axes of the first to third planes.
With the camera facing perpendicular to Pa or Pc,
and are arranged in order in a diagonally upward direction from the transformer unit side to the power receiving unit side, and the first to third busbars are respectively arranged in a diagonally upward direction. The first to third conductors 64 to 66 are connected to the power receiving switching circuit No. 3 at the same height as the third bus bar BUSc located at the highest position among the first to third bus bars. arranged along the first to third planes Pa to Pc, respectively, and the first to third generating lines BUSa to BUSc
Conductor connection portions 50A to 50C, 51A to 50C for connecting the connection conductors to positions intersecting the first to third planes Pa to Pc, respectively;
and 52A to 52C.