JP3169251B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear for a substation for high demand power receiving and receiving equipment, and more particularly to a gas insulated switchgear having a voltage transformer and a disconnector for bypass.

[0002]

2. Description of the Related Art Conventionally, gas-insulated switchgears for substation facilities for high demand for private demand are known as a one-meter method and a two-meter method because of the difference in the method of measuring the amount of electric power used. The former is configured to be connected to two transformers via one instrument current transformer after receiving power through two lines, as shown in, for example, JP-A-1-303002.
Despite improving the reliability of the power supply as a two-line power receiver, consumers must stop all services when checking or replacing the transformer for current transformers. On the other hand, the latter uses two instrument current transformers as shown in, for example, Japanese Patent Application Laid-Open No. 1-248911, and when one of them is inspected, the amount of electric power used by the other instrument current transformer is reduced. The total stoppage can be prevented by weighing.

FIG. 1 shows a single-line diagram of the latter configuration.
It is shown in FIG. Two-line power receiving unit LU1, LU2
Are connected by a connecting conductor C1, while the transformer units TU1 and T2 are connected to two transformers TR1 and TR2.
The power receiving side of U2 is connected by a connecting conductor C2, and between the connecting conductors C1 and C2, two voltage transformer current transformer units PU
1, PU2 were connected in parallel. Therefore, at the time of checking or replacing the transformer for current transformer 13, the disconnectors at both ends of the transformer for current transformer PU1 are opened and disconnected from the circuit, and the other transformer for current transformer PU2 is disconnected.
Can be connected in the circuit, and the customer does not stop at all.

[0004]

As described above, the total stoppage can be prevented by using the two current transformers 13 for the instrument. However, when one current transformer for the instrument is used. This results in a very large gas insulated switchgear. In particular, recently, it is difficult to make a full stop for continuous operation like an intelligent building or an unmanned operation factory, and a small gas insulated switchgear that can be configured in a limited space such as a building is desired. Therefore, the above-mentioned configuration cannot cope with this.

Therefore, as shown in FIG. 15, a voltage transformer / current transformer unit PU having a single voltage transformer / current transformer 13 is provided.
1 and the bypass disconnector 22 are connected in parallel, and when checking or replacing the transformer for current transformer 13, the bypass disconnector 22 is closed to continue the operation. It has been proposed to try to convert from.

FIG. 16 is a plan view of a gas-insulated switchgear constructed based on a known technique and based on a single-line diagram shown in FIG. The two-line power receiving units LU1 and LU2 are arranged to face each other, and the transformer-side ends thereof are connected by a connection conductor C1, while the transformer-side units TU1 and TU2 reaching the two transformers TR1 and TR2 are arranged to face each other. The power-receiving-side end is connected by a connection conductor C2, and the connection conductors C arranged in substantially parallel opposition
An opposing portion of C1 and C2 is connected to an instrument transformer / current transformer unit PU1 having an instrument transformer / current transformer 13 by a bypass disconnector 22. In particular, since the closed-loop constituent part composed of the instrument transformer / current transformer unit PU1 and the bypass disconnector 22 is formed in a plane on the installation surface, the installation area becomes very large. In a conventional gas insulated switchgear having two current transformers for an instrument, the bypass disconnecting switch 22 is replaced with a transformer current transformer unit having substantially the same configuration as the transformer current transformer unit PU1. Has become. For this reason, the closed-loop component, which is also composed of two sets of voltage transformer current transformer units for an instrument, is planarly formed on the installation surface, and is a gas-insulated switchgear having a large installation area.

It is an object of the present invention to provide a gas insulated switchgear having a reduced installation area by using a bypass disconnector.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a closed-loop component having an instrument current transformer and a bypass disconnector provided in electrical parallel with the instrument. To the connection conductors
It is characterized in that it is configured on a plane that is orthogonal .

[0009]

In the gas insulated switchgear according to the present invention, the closed-loop component is formed on a vertical plane as described above, so that the occupied area is reduced as compared with the conventional case where the closed-loop component is formed on a mounting surface in a planar manner. Therefore, the installation area as a whole can be significantly reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 6 is a single-line diagram of a privately owned extra high-voltage substation facility rewritten according to the configuration of the gas insulated switchgear according to one embodiment of the present invention, and includes two sets of power receiving units LU1, LU2 and transformer units TU1, TU2. Have the same configuration, and only one of them will be described. The power receiving unit LU1 shows a case where a cable is drawn in. A current transformer 1 is provided on the drawing side of the cable head 2, and a main circuit conductor introduced via the cable head 2 is connected to one end of a circuit breaker 8 via a disconnector 6. And the other end of the circuit breaker 8 is connected to the disconnector 9. One end of the ground switch 3 and one end of the lightning arrester 4 are connected between the cable head 2 and the disconnector 6 via the lightning arrester disconnecting device 5. Grounding switches 7 and 10 are connected to the circuit breakers of the disconnectors 6 and 9, respectively.

The connection between the power receiving units LU1 and LU2 on the transformer side is connected by a connection conductor C1, and similarly, the connection between the power receiving side ends of the transformer units TU1 and TU2 is also connected to the connection conductor C2.
And a transformer-connected current transformer unit PU1 and a bypass disconnecting switch 22 are electrically connected in parallel between the connection conductors C1 and C2 to form a closed loop component. The voltage transformer / current transformer unit PU1 having the closed loop configuration includes a grounding switch 1 on both sides of the voltage transformer / current transformer 13 for an instrument.
The disconnectors 11 and 14 are connected to each other via the switches 2 and 15. On the other hand, the transformer unit TU1 includes the disconnector 1
6 and the earthing switch 17 are connected to one end of the circuit breaker 18,
The other end of circuit breaker 18 is connected to transformer TR1 via grounding switch 19 and cable head 20. The transformer-side unit TU2 has the same configuration and is connected to the transformer TR2.

As can be seen from FIG. 1, a closed loop component having an instrument current transformer 13 and a bypass disconnecting switch 22 is located substantially at the center of the whole, and one side of the closed loop component is a power receiving unit LU1 and a transformer side. The unit TU1 and the power receiving unit LU2 and the transformer unit TU on the other side.
2 are arranged, and a plan view of an actual gas insulated switchgear is shown in FIG.

In FIG. 1, the instrument transformer 13 is actually located below the bypass disconnector 22.
It is shown shifted to the left for convenience. Although the details will be described later, the closed loop component including the transformer for current transformer 13 and the disconnector 22 for bypass is substantially perpendicular to the installation surface .
One said is configured to a flat surface perpendicular to the respective connection conductor, a transformer side unit TU and the power receiving unit LU1 on the one side
1, and a power receiving unit LU2 and a transformer unit TU2 are disposed on the other side. The operation cubicles 50 to 54 in each unit are arranged in a row on the right side of the drawing.

Next, the configuration of the power receiving unit LU1 will be described with reference to FIG. 2, which is a front view taken along the line II-II of FIG. The circuit breaker 8 is formed in a vertical container, and a pair of outlets formed on the upper and lower left sides has an upper pipe 56 and a lower pipe 5.
7 are connected substantially horizontally. A disconnector 9 and a grounding switch 10 are formed in the upper tube 56, and a disconnector 6, a grounding switch 7 and the arrester disconnecting device 5 are formed in the lower tube 57. The upper pipe 56 is connected to the connection bus pipe 23 provided substantially in parallel with the installation surface.
3, a connection conductor C1 is arranged. On the other hand, the lower pipe 5
The lightning arrester 4 is connected to the lower part of the cable 7, and the cable head container 58 is connected to the lower tube 57 in the axial direction. The grounding switch 3 and the cable head 2 are formed in the cable head container 58, and the main circuit conductor is insulated and led out of the cable head container 58 through the cable head 2 so as to surround the cable. A current transformer 1 is arranged. Therefore, each of these containers 55-5
8 is arranged so as to be located on a plane perpendicular to the installation surface, which contributes to reducing the installation surface of the operation cubicles 50 to 54 in the juxtaposition direction.

FIG. 3 is a front view of the transformer-side unit TU1 as viewed along the line III-III in FIG. Vertical container 5
A circuit breaker 18 is formed in the upper part 9, and a disconnector 16 and a grounding switch are formed in an upper pipe 60 connected to an upper outlet of the circuit breaker 18. The upper pipe 60 is provided substantially parallel to the installation surface. Connected to the connecting busbar 29. This connecting bus tube 29
The connection conductor C2 is disposed in the inside and is located almost directly below the connection bus tube 23 shown in FIG.
The circuit breaker 8, so that 3, 29 is in such a vertical relationship,
The height of the eighteen vertical containers 55 and 59 is adjusted. A cable head container 61 is connected to the lower outlet of the vertical container 59, and a grounding switch 19 is formed therein, and is insulated and led out by a cable 62 via a cable head 20. The cable TR is a transformer TR not shown.
1 connected.

FIG. 4 is a front view of the instrument transformer / current transformer unit PU1 along the line IV-IV in FIG. As described above, the closed loop constituting part is constituted by including the transformer for current transformer 13 for the instrument and the disconnector 22 for the bypass, and these are constituted on a plane substantially perpendicular to the installation surface and perpendicular to the connection conductors. ing. In other words, the voltage transformer 13 for the instrument is arranged on the installation surface side, and the connection bus tubes 23, 2
9 is located. Double connection bus tube 23, 29
Is connected to a bypass disconnector 22 formed in a vertical container 32 on one side, and a vertical connecting container is connected to the opposite side via disconnectors 11 and 14 and grounding switches 12 and 15 respectively. The lower part of the communication container 33 is connected to the instrument transformer 13. In this way, the instrument transformer / current transformer unit PU1 is constituted by a plane substantially perpendicular to the installation surface, similarly to the other units, so that the closed-loop component is configured to be planar with respect to the installation surface. Also, the installation area in the juxtaposition direction of the operation cubicles 50 to 54 shown in FIG. 1 can be greatly reduced.

FIG. 5 is a side view of the entire structure taken along the line VV in FIG. As can be seen from the figure, each unit LU1, TU1, PU1, LU2, TU2 is
Each is configured in a plane perpendicular to the mounting surface and parallel to each other. In particular, the transformer / current transformer unit P
Since U1 is configured as a vertical plane including the bypass disconnecting switch 22 (not shown), the units can be installed close to each other, and the installation area can be reduced in the juxtaposition direction. The connection bus tube 23 containing the connection conductor C1 connecting the power receiving units LU1 and LU2, and the connection bus tube 29 containing the connection conductor C2 connecting the transformer units TU1 and TU2 are arranged with respect to the installation surface. In addition, since the bypass disconnecting switch 22 connected therebetween is provided in the upper and lower stages substantially parallel to each other, the bypass disconnecting switch 22 connected therebetween can be configured in a vertical shape and arranged on the above-described vertical plane.

Next, a detailed configuration example of the voltage transformer / current transformer unit PU1 will be described with reference to FIGS. 7 and 8. FIG. FIG.
Conductors C connecting between the power receiving units LU1 and LU2 arranged on both sides of the voltage transformer / current transformer unit PU1 shown in FIG.
1 is housed in a central portion in the axial direction,
That is, the spherical container 31 is provided at a portion that intersects with the vertical plane that constitutes the instrument transformer / current transformer unit PU1. The spherical container 31 has outlets 31a, 31b for connecting a series of connecting busbars 23, and outlets 31c, 31d in a direction orthogonal to the connecting busbars 23.
1c is a communication container 3 described in detail later through a bellows 64.
3 is connected to the outlet portion 33a above and the outlet portion 31d
Is connected to an outlet 32a formed above a vertical container 32 in which a bypass disconnector 22, which will be described in detail later, is stored. In the connection bus tube 23, three-phase AC connection conductors C1u,
C1v and C1w are supported by the insulator 38a so as to be located at each vertex of the virtual triangle. However, when reaching the inside of the spherical container 31, the connection conductors C1u, C1v, C1w
As shown in FIG. 8, which is a cross-sectional view taken along the line VIII-VIII in FIG. 7, the position is changed so as to secure the inter-phase insulation distance while securing the insulation distance with the conductors 25u, 25v, 25w. The connection bus tube 23 is bent so as to return to the same position. In the spherical container 31, the connection conductor C1u,
The conductors 25u, 25v, and 25w disposed between the lead portions 31c and 31d so as to be orthogonal to C1v and C1w are arranged in substantially the same horizontal plane in all three phases, and the conductors 34u, 34v, and 34w.
w and a suitable insulator 38 respectively.
b. These conductors 25u, 25v,
A disconnector 11 and a grounding switch 12 are formed in the middle of 25w. That is, one end of the mover 11a is rotatably connected and supported on the insulating spacer 65 side provided between the outlet portion 31C and the bellows 64, and the stator 11b is supported by the insulator 38b and connected to the mover 11a. Insulator 1
When the movable element 11a is operated to the open position by 1c, the movable element 11a is configured to contact the ground-side stator 12a of the grounding switch 12.

Next, the outlet portion 31 of the spherical container 31 shown in FIG.
The communication container 33 connected to the c side will be described. FIG.
As shown in FIG. 7, the communication container 33 has a pair of upper and lower outlets 33a and 33b formed on the spherical container 31 side, and the lower part thereof reaches the well-known instrument transformer. In the communication container 33, the conductors 25u, 25v, 25 in the spherical container 31 are provided.
w and conductors 34u, 34v, and 34w are insulators 38.
The two-phase conductors 34v and 34w are formed in a hollow shape, and accommodate the conductors 35v and 35w therein.
3 to form a reciprocating conductor. This conductor 35v, 3
5 w and the conductor 34 u are respectively connected to three-phase conductors represented by the conductor 27 in a spherical container 37 having substantially the same configuration as that in the spherical container 31. A vertical container 32 is connected between the outlet portions 31 d and 37 d of the spherical conductors 31 and 37, and a bypass disconnector 22 is formed in the vertical container 32. That is, the bypass disconnecting switch 22 is provided with a stator 22a on the side represented by the conductor 25w, and rotatably connects one end of the mover 22b to the side represented by the conductor 27, Thus, a rotational force is applied to the mover 22b via the insulator 22C to open and close the mover 22b. In this way, the closed-loop component comprising the instrument transformer 13 and the bypass disconnector 22 is constituted by one vertical plane.

Although it has been described that the spherical container 37 has substantially the same configuration as the inside of the spherical container 31, the spherical container 3 shown in FIG.
5 are connected to the outlet portions corresponding to the outlet portions 31a and 31b, and both ends thereof are connected to the transformer units TU1 and TU2 shown in FIG. 1, respectively. When checking or replacing the transformer for current transformer 13 for the instrument, the disconnectors 11 and 14 shown in FIGS. 6 and 8 are opened, and the side of the transformer for current transformer 13 for the instrument is opened by the earthing switches 12 and 15. Ground, while the bypass disconnector 22
Is closed.

FIG. 9 is a plan view showing a gas-insulated switchgear according to another embodiment of the present invention. As in the case of FIG. ing. FIG. 13 shows a single-line diagram rewritten to match the configuration of the gas insulated switchgear. That is, the power receiving units LU1 and LU2 for two lines are arranged on one side of the transformer for voltage transformer 13 and the transformer T for two lines on the other side.
Transformer side units TU1, T connected to R1, TR2
U2 is arranged. Only the differences between the above embodiment and the previous embodiment will be described, and the same reference numerals will be given to the same components, and detailed description will be omitted.

FIG. 1 is a sectional view taken along line XX of FIG.
0 indicates the configuration of the power receiving unit LU1, which is the same as in the previous embodiment. The configuration of the adjacent power receiving unit LU2 is the same as the configuration of the power receiving unit LU1. XI-XI in FIG.
The transformer current transformer unit PU1 shown in FIG. 11 which is a cross-sectional view taken along the line is basically the same as the configuration shown in FIGS. 7 and 8, but is different from the transformer current transformer unit PU shown in FIG.
1 has the power receiving units LU1 and LU2 arranged together and the other side has the transformer units TU1 and TU2 arranged together. Therefore, the outlet 31b of the spherical container 31 shown in FIG. 7 and the outlet 31b shown in FIG. The outlet 37a of the spherical container 37 becomes unnecessary. Therefore, as can be seen particularly from FIG. 9, the spherical containers 31 and 37 in the previous embodiment are replaced with containers 66 and 67 having a substantially T-shaped cross section. FIG. 12 which is a cross-sectional view taken along the line XII-XII of FIG. 9 shows the transformer-side unit TU1, which can have the same configuration as that of the previous embodiment. The configuration of the cubicle 53 is the same as that of the power receiving unit LU1 shown in FIG. 10, and is provided at a lower outlet of the vertical container 59 of the circuit breaker 18 via a lower pipe 60 in which the disconnector 16 and the grounding switch 17 are formed. Connection bus tube 30 housing connection conductor C2 shown in FIG.
Is connected to one end of a substantially horizontal upper pipe 65 inside which the grounding switch 19 is formed, and a connecting bus pipe 30 is connected to the other end of the upper pipe 65.
And a substantially vertical cable head container 61 located on the side opposite to the circuit breaker.

Also in this embodiment, the closed-loop component comprising the instrument current transformer 13 and the bypass disconnector 22 and the like connected in parallel to it is formed in a plane substantially perpendicular to the installation surface. As in the previous embodiment, the installation area can be reduced in the direction in which the units are juxtaposed. Also, the power receiving units LU1 and LU2 and the transformer side unit TU
1 and TU2 are arranged together on both sides of the closed-loop component, so that the connecting busbars 24 and 30 containing the connecting conductors C1 and C2 can be formed in a container 66 having a substantially T-shaped cross section, which is simpler than in the previous embodiment. 67.

In each of the above embodiments,
Power receiving units LU1 and LU2 and transformer-side units TU1 and TU2 are provided on both sides of the instrument transformer / current transformer unit PU1.
Are distributed, these units may be integrated on one side of the instrument transformer / current transformer unit PU1. The arrangement of the three-phase conductors in the connection bus tubes 23, 24, 29, 30, the spherical container 31, the vertical container 32, the communication container 33, and the containers 66, 67 is not limited to the illustrated example but is known in a three-phase package. Various arrangement shapes can be adopted. Further, in the embodiment shown in FIG.
Although spherical containers 31 and 37 were used for the connection with 3, 29,
However, the present invention is not limited thereto, and the same applies to a case in which a vertical container having outlets 31a, 31b, 31c, and 31d in four directions on substantially the same horizontal plane and extending vertically is used. In the embodiment shown in FIG. 9, containers 66 and 67 having a substantially T-shaped cross section are used.
It may be substantially I-shaped in cross section in which the axial length of the outlet for connection to the connection bus tubes 24, 30 is extremely short.

[0025]

As described above, the gas insulated switchgear according to the present invention has a closed loop component comprising a voltage transformer and an electric disconnector for bypass connected electrically in parallel with the current transformer. , Substantially perpendicular to the mounting surface , and each of the above connections
Since the plane is perpendicular to the conductor, the installation area can be reduced in a direction perpendicular to the vertical plane.

[Brief description of the drawings]

FIG. 1 is a plan view of a gas-insulated switchgear according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the gas insulated switchgear shown in FIG. 1 taken along the line II-II.

FIG. 3 is a sectional view of the gas insulated switchgear shown in FIG. 1 taken along the line III-III.

FIG. 4 is a cross-sectional view of the gas insulated switchgear shown in FIG. 1 taken along line IV-IV.

5 is a cross-sectional view of the gas insulated switchgear shown in FIG. 1 taken along line VV.

6 is a single-line diagram corresponding to the configuration of the gas-insulated switchgear shown in FIG.

FIG. 7 is an enlarged cross-sectional view showing a main part of the gas insulated switchgear shown in FIG.

8 is a longitudinal sectional view of a main part shown in FIG. 7;

FIG. 9 is a plan view of a gas-insulated switchgear according to another embodiment of the present invention.

10 is a cross-sectional view of the gas insulated switchgear shown in FIG. 9, taken along line XX.

11 is a cross-sectional view of the gas insulated switchgear shown in FIG. 9 taken along line XI-XI.

12 is a cross-sectional view of the gas insulated switchgear shown in FIG. 9 taken along the line XII-XII.

FIG. 13 is a single-line diagram corresponding to the configuration of the gas insulated switchgear shown in FIG. 9;

FIG. 14 is a single-line diagram of a conventional extra power receiving facility for private demand.

FIG. 15 is a single-line diagram of an extra-high-power receiving facility for private use which is an object of the present invention.

FIG. 16 is a plan view of the gas-insulated switchgear configured corresponding to FIG.

[Explanation of symbols]

 LU1, LU2 Power receiving unit TU1, TU2 Transformer side unit PU1 Transformer current transformer unit for instrument C1, C2 Connection conductor 13 Transformer current transformer for instrument 22 Bypass disconnector 23, 29 Connecting bus tube 31 Spherical container 32 Vertical container 33 Communication container

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Miwada 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside of Kokubu Plant, Hitachi, Ltd. (72) Inventor Hiroshi Maeda 1-Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1-1 In the Kokubu Plant of Hitachi, Ltd. (56) References JP-A-1-303002 (JP, A) JP-A-5-22816 (JP, A) JP-A-5-56520 (JP, A) Patent 2612105 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02B 13/035-13/075

Claims (6)

(57) [Claims] An electric transformer and a bypass disconnecting switch are electrically connected in parallel to form a closed loop component, one end of which is connected to a power receiving unit via a connecting conductor and the other end. Is a gas-insulated switchgear connected to a transformer-side unit via another connection conductor, wherein the closed-loop component is substantially perpendicular to an installation surface , and
A gas insulated switchgear characterized by being formed on a plane orthogonal to a conductor . 2. The connection bus according to claim 1, further comprising: two upper and lower connection bus tubes extending in a direction substantially perpendicular to the vertical plane, wherein the connection conductor and the other connection conductor are provided in the connection bus tubes. A gas insulated switchgear characterized by being housed. 3. The transformer according to claim 2, wherein said voltage transformer is provided on an installation surface side, and the upper and lower two-stage connecting bus pipes and the lateral sides of said connecting bus pipes are located above said connecting transformer. A gas insulated switchgear comprising the bypass disconnector described above. 4. The gas insulated switchgear according to claim 2, wherein the power receiving unit is arranged on one side of the closed loop constituting part, and the transformer side unit is arranged on the other side. 5. The power receiving unit and the transformer-side unit each having two lines, and the power-receiving unit and the transformer-side unit are formed on one side of the closed-loop constituent part. A gas-insulated switchgear, wherein the other power receiving unit and the other transformer side unit are configured on the other side. 6. A container according to claim 5, wherein a connecting portion between said closed loop constituting portion and said connecting bus tube is provided with a spherical container having outlets in four directions on substantially the same horizontal plane. Gas insulated switchgear.