JP4429740B2 - Compound insulation switchgear - Google Patents

Description

  The present invention relates to an integrally cast composite insulating switchgear.

  In the conventional composite insulated switchgear, the grounding movable electrode that is electrically connected to the movable shaft and supported by the grounding movable shaft (grounding contact movable conductor) is opposed to the ground fixed electrode in the molded vacuum vessel. Is arranged. Further, the grounding movable shaft is connected to the operation rod of the grounding operation mechanism via an insulating rod. Then, when the grounding movable shaft is driven by the operation mechanism, the grounding movable electrode and the grounding fixed electrode are opened and closed. On the other hand, an insulating barrier is formed so as to surround the grounding movable shaft exposed from the vacuum vessel. Further, the test terminal connected to the grounding movable shaft by a flexible conductor is integrally molded with the vacuum vessel (for example, see Patent Document 1).

Japanese Laid-Open Patent Publication No. 2001-135207 (Page 4, Figure 1)

  In the conventional composite insulation switchgear, an insulation rod is arranged between the grounding movable shaft exposed through the vacuum vessel and the operation rod, and the test terminal is integrally molded with the vacuum vessel. Furthermore, since the grounding movable shaft and the test terminal are connected by a flexible conductor in the insulation barrier, it is difficult to reduce the size because a space and an insulation distance corresponding to the movement of the flexible conductor are required. There was a problem that.

  The present invention has been made to solve the above-described problems, and is a composite insulation switchgear that can be miniaturized by connecting the test terminal directly to the grounding movable shaft to form an integral structure with the insulation rod. Is to provide.

In the composite insulated switchgear according to the present invention, the main circuit opening / closing means comprising the main circuit fixed electrode and the main circuit movable electrode, which is opened and closed by the main circuit operating mechanism, is disposed in the first vacuum vessel, and the ground fixed electrode and A ground opening / closing means comprising a ground movable electrode and opened / closed by a ground operating mechanism is disposed in the second vacuum vessel, and the ground movable shaft movable in the axial direction of the second vacuum vessel and the ground movable electrode are electrically connected. In composite insulated switchgear that is electrically and mechanically connected and electrically connected between the ground fixed shaft and the main circuit movable shaft, it is electrically connected on the same axis as the ground movable shaft and can apply a test voltage. A test terminal, a test terminal, and a grounding movable shaft are integrally cast with resin, and are connected to a grounding operation mechanism and have an insulating rod having a spring receiving portion, and are inserted into the insulating rod and received by the spring receiving portion. Et A spring that presses the ground movable electrode against the ground fixed electrode, an electric field relaxation shield disposed in the insulating rod so as to surround the test terminal, and a conductive member disposed on the surface of the insulating rod facing the electric field relaxation shield. It is provided.
A main circuit opening / closing means comprising a main circuit fixed electrode and a main circuit movable electrode, which is opened and closed by a main circuit operation mechanism, is disposed in the first vacuum vessel, and comprises a ground fixed electrode and a ground movable electrode. A ground opening / closing means that is opened / closed by the first vacuum vessel is disposed in the second vacuum vessel, and a ground movable shaft that can move in the axial direction of the second vacuum vessel and a ground movable electrode are electrically and mechanically connected and grounded. In a composite insulated switchgear that is electrically connected between the fixed shaft and the main circuit movable shaft, formed by integrally casting the connecting conductor coaxially with the grounded movable shaft and the connecting conductor with resin. An insulating rod having a spring receiving portion, a spring inserted into the insulating rod and received by the spring receiving portion, pressing the grounding movable electrode against the grounding fixed electrode, and electrically connected to the connecting conductor coaxially with the grounding movable shaft Connected and test voltage It is obtained by a pressurized possible test terminal.

  The present invention electrically connects a test terminal to which a test voltage can be applied to a grounding movable shaft and forms an insulating rod by integrally casting the test terminal and the grounding movable shaft with a resin. By connecting to the grounding operation rod, it is possible to reduce the size by shortening the electrical insulation distance.

Embodiment 1 FIG.
1 is an electric circuit diagram according to Embodiment 1 for carrying out the present invention, FIG. 2 is a sectional view showing the configuration of Embodiment 1, and FIG. 3 is a sectional view taken along line III-III in FIG. .
1 to 3, one end of a first main circuit insulating container 2 made of, for example, ceramic, which is disposed at one end of a metal-made cylindrical metal container 1 is connected to the metal container 1 in a sealed state. Has been. Further, one end of a second main circuit insulating container 3 made of, for example, ceramic, disposed at the other end of the metal container 1 is connected to the metal container 1 in a sealed state. And the sealing members 4 and 5 are connected to each other end of each insulation container 2 and 3. The insulating containers 2 and 3 made of ceramic and the sealing members 4 and 5 are connected via an iron / nickel alloy, iron / nickel / cobalt alloy or the like having a thermal expansion coefficient close to that of the ceramic. The metal container 1, the insulating containers 2 and 3, and the sealing members 4 and 5 constitute a first vacuum container 6. When used in a power system, the main circuit operation bar 15a is grounded.

A main circuit fixed electrode 7 and a main circuit movable electrode 8 are disposed to face each other in the first main circuit insulating container 2. The main circuit opening / closing means 9 is composed of the main circuit fixed electrode 7 and the main circuit movable electrode 8. The main circuit fixed electrode 7 is electrically connected to the first main circuit external terminal 10 penetrating the sealing member 5 in a sealed state on one end side of the first vacuum vessel 6, and the first main circuit external terminal 10 is supported. The main circuit movable electrode 8 is electrically connected to one end of a conductive main circuit movable shaft 11 disposed in the first vacuum vessel 6 and supported by the main circuit movable shaft 11 so as to be in a first vacuum. The container 6 is movable in the axial direction. A second external terminal 12 made of a metal having high conductivity such as copper is disposed on the metal container 1. The second main circuit external terminal 12 and the main circuit movable shaft 11 are electrically connected by a flexible conductor 13.
One end of the insulating member 14 disposed in the second main circuit insulating container 3 is connected to the other end of the main circuit movable shaft 11. The other end of the insulating member 14 is connected to a main circuit operation rod 15 a of the main circuit operation mechanism 15. A bellows 16 is disposed between the main circuit operating rod 15a and the first vacuum vessel 6 to seal between the main circuit operating rod 15a and the first vacuum vessel 6, and the main circuit operating rod 15a. Is configured to be movable in the axial direction of the first vacuum vessel 6.
For example, the second vacuum vessel 17 made of ceramic is arranged so that the axial direction is parallel to the axial direction of the first vacuum vessel 6. A ground fixed electrode 18 and a ground movable electrode 19 are disposed opposite to each other in the second vacuum container 17. The ground fixed electrode 18 and the ground movable electrode 19 constitute a ground opening / closing means 20. The ground fixed electrode 18 is electrically connected to the first ground external terminal 22 penetrating the sealing member 21 in a sealed state on one end side of the second vacuum vessel 17 and supported by the first ground external terminal 22. Has been. The grounding movable shaft 23 passes through the bellows 25 so as to be movable in the axial direction of the second vacuum container 17 with the sealing member 24 sealed in the other end side of the second vacuum container 17. The ground movable electrode 19 is electrically connected to the ground movable shaft 23 and supported by the ground movable shaft 23. The second main circuit external terminal 12 and the first ground external terminal 22 are electrically connected by a connecting member 26.

The test terminal 27 and the ground movable shaft 23 are electrically connected directly, and the test terminal 27 and the ground movable shaft 23 are integrally cast (molded) to form the insulating rod 28. A flange portion 28 a is formed on the grounding movable shaft 23 side of the insulating rod 28. The insulating rod 28 and the grounding operation rod 29a of the grounding operation mechanism 29 are connected by bolting or the like.
The outer surface of each vacuum vessel 6, 17 is a portion in which at least the tip portions 10 a, 22 a of the first main circuit external terminal 10 and the first ground external terminal 22 and the main circuit operation rod 15 a penetrate the first vacuum vessel 6 and A mold insulator 30 is formed by casting with an epoxy resin or the like except for a portion where the grounding movable shaft 23 penetrates the second vacuum vessel 17. An insulating barrier 30 a integrally formed with the mold insulator 30 is formed so that the ground movable shaft 23 surrounds a portion exposed from the second vacuum container 17. The insulating barrier 30a is open on the side of the insulating rod 28 facing the flange portion 28a. Further, the first main circuit external terminal 10 and the first ground external terminal 22 have a bushing structure formed of a mold insulator 30. Then, the mold insulator 30 has a predetermined distance necessary for interface insulation from the respective distal end portions 10a and 22a of the external terminals 10 and 22 and a predetermined distance from the operation mechanisms 15 and 29 side of the vacuum containers 6 and 17. A conductive member 31 subjected to conductive treatment is disposed on the surface. The conductive member 31 is formed, for example, by metal spraying such as aluminum or zinc or application of a conductive paint.

In the composite insulated switchgear configured as described above, when the power system is energized, the test terminal 27 is grounded, the main circuit opening / closing means 9 is closed by the main circuit operating mechanism 15, and the ground operating mechanism 29 The ground opening / closing means 20 is set to “open”. In this state, energization is performed through the path of the first main circuit external terminal 10 and the first ground external terminal 22.
When a withstand voltage test is performed on a cable (not shown) connected to the first ground external terminal 22, the test terminal 27 is released from the ground and a predetermined voltage required for the withstand voltage test is released from the test terminal 27. Is applied to the cable.
As described above, the test terminal 27 and the grounding movable shaft 23 are integrally cast to form the insulating rod 28, and the insulating rod 28 and the grounding operation rod 29 a of the grounding operation mechanism 29 are connected to each other. The entire apparatus can be reduced in size by shortening the electrical insulation distance of the portion where 23 penetrates through the second vacuum vessel 17.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view showing the configuration of the second embodiment. In FIG. 4, 1 to 26, 30, and 31 are the same as those in the first embodiment. The test terminal 32 is directly connected to the ground movable shaft 23 on the same axis. The test terminal 32 and the movable shaft 23 are integrally cast (molded) to form an insulating rod 33, which is connected to a grounding operation rod (not shown) of the grounding operation mechanism 34. A hook-shaped spring receiving portion 33 a is formed on the grounding movable shaft 23 side of the insulating rod 33. Further, planar sliding portions 33b and 33c are formed on the side of the insulating rod 33 opposite to the spring receiving portion 33a. Then, when the insulating rod 33 is driven by the ground operation mechanism 34, the ground opening / closing means 20 is opened and closed. In this case, the sliding portions 33b and 33c of the insulating rod 33 are guided in the axial direction of the grounding movable shaft 23 by the guide members 35a and 35b provided in the grounding operation mechanism 34, and the grounding movable shaft 23 rotates around the axis. To prevent it. Further, a coiled spring 36 coaxial with the grounding movable shaft 23 is disposed between the spring receiving portion 33 a of the insulating rod 33 and the spring receiving body 35 provided in the grounding operation mechanism 34. The spring 36 acts to pressurize the electrodes 18 and 19 to increase the contact pressure when the ground opening / closing means 20 is “closed”.
Thus, by arranging the test terminal 32 so as to be coaxial with the grounding movable shaft 23 and above the grounding operation mechanism 34, the depth in the direction perpendicular to the axial direction of the grounding movable shaft 23 can be shortened. it can.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing a main part of the third embodiment. 5, reference numerals 17, 23 to 25, 30, 31 are the same as those in the first embodiment. Electric field relaxation shields 37 and 38 disposed so as to surround the test terminal 32 are disposed in the insulating rod 33 in the vicinity of the spring receiving portion 33a and the sliding portions 33b and 33c. Further, a conductive member 39 is disposed between the surfaces of the insulating rod 33 facing the electric field relaxation shields 37 and 38. When used as a composite insulation switchgear connected to the power system, the electric field relaxation shields 37 and 38 and the conductive member 39 are grounded.
As described above, the electric field relaxation shields 37 and 38 are disposed so as to surround the test terminal 32 in the insulating rod 33 in the vicinity of the spring receiving portion 33 and the sliding portions 33b and 33c, and are opposed to the electric field relaxation shields 37 and 38. Occurs during a withstand voltage test in which a test voltage is applied from the test terminal 32 to the power receiving cable (connected to the first ground external terminal 22 in FIG. 2) by disposing the conductive member 39 between the surfaces of the insulating rod 33 . Corona can be suppressed.

Embodiment 4 FIG.
FIG. 6 is a cross-sectional view showing a main part of the fourth embodiment. In FIG. 6, reference numerals 17, 23 to 25, 30, 31, and 34 are the same as those in the second embodiment. The connection conductor 40 is directly connected to the ground movable shaft 23 coaxially with the ground movable shaft 23. The connecting conductor 40 is molded with resin, and an insulating rod 41 is formed on the outer surface of the connecting conductor 40. The insulating rod 41 has a spring receiving portion 41a. Further, a test terminal 42 is arranged on the same axis as the ground movable shaft 23 with a predetermined distance from the connection conductor 40. The test terminal 42 is fixed to the ground operating mechanism 34 by forming a bushing-shaped mold insulator 43 by resin casting. Further, an insulating barrier 44 extending from the mold insulator 43 is formed to face the insulating rod 41 by a predetermined length. The connection conductor 40 and the test terminal 42 are electrically connected by a flexible conductor 45 formed in a U shape.
A coiled spring 47 is arranged coaxially with the grounding movable shaft 23 between the spring receiving part 41a of the insulating rod 41 and the spring receiving body 46 provided in the grounding operation mechanism 34. The spring 47 acts to pressurize both electrodes (not shown) to increase the contact pressure when the ground opening / closing means (arranged coaxially with the ground movable shaft 23) is “closed”.
As described above, the connection conductor 40 and the test terminal 42 are connected by the flexible conductor 45, so that a large current is passed between the test terminal 42 and the connection conductor 40 for a short time. The electromagnetic repulsive force generated in the conductive conductor 45 acts between both electrodes (not shown) of the ground switching means to increase the contact pressure. Therefore, since the load of the spring 47 can be reduced, the size of the grounding operation mechanism 34 can be reduced.

7 is an electric circuit diagram of the first embodiment to which the present invention is applied, FIG. 8 is a cross-sectional view showing a main part of the first embodiment, FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8, and FIG. FIG. 8 is a sectional view taken along line XX.
7 to 10, 1 to 21, 23 to 25, and 27 to 29 are the same as those in the first embodiment. The main circuit vacuum valves 48 to 50 are respectively composed of 1 to 16, and the ground vacuum valves 51 and 52 are respectively composed of 17 to 21, 23 to 25, 27 to 29 and 53 to be described later.
The main circuit movable electrodes 8 of the main circuit vacuum valves 48 to 50 are connected in parallel. The ground fixed electrodes 18 of the ground vacuum valves 51 and 52 are connected to the main circuit fixed electrodes 7 of the main circuit vacuum valves 49 and 50, respectively. The ground movable electrode 19 of each ground vacuum valve 51, 52 is grounded.
In the composite insulated switchgear configured as described above, for example, one line is received from the main circuit fixed electrode 7 side of the main circuit vacuum valve 48, and from each main circuit fixed electrode 7 of each main circuit vacuum valve 49, 50. Power is supplied to the load as two lines. In addition, when using it for a three-phase circuit, it becomes three sets in total, one set for each phase. The ground fixed electrode 18 is electrically connected to the ground fixed electrode holding member 53 and supported by the ground fixed electrode holding member 53. The first main circuit external terminal 10 and the ground fixed electrode holding member 53 are connected by a connection member 54.

  Further, the second main circuit external terminal 12 of the main circuit vacuum valve 48 and the second main circuit terminal 12 of the main circuit vacuum valve 49 are electrically connected by the connecting member 55, and the second main circuit vacuum valve 49 is connected to the second main circuit vacuum valve 49. The main circuit external terminal 12 and the second main circuit external terminal 12 of the main circuit vacuum valve 50 are connected by a connecting member 56. The outer surface of each of the vacuum valves 48 to 52 is a portion where at least the tip portion 10a of the first main circuit external terminal 10 and the main circuit operating rod 15a penetrate the first vacuum vessel 6, and the grounding movable shaft 23 is the second vacuum vessel. A mold insulator 57 cast by an epoxy resin or the like is formed except for a portion penetrating 17. An insulating barrier 57 a integrally formed with the mold insulator 57 is formed so that the ground movable shaft 23 surrounds the portion exposed from the second vacuum container 17. The insulating barrier 57a is open on the side of the insulating rod 28 facing the flange portion 28a. Further, the first main circuit ground terminal 10 has a bushing structure formed of a mold insulator 57. Then, the surface of the mold insulator 57 is electrically conductive from the front end portion 10a of the first main circuit external terminal 10 to the distance necessary for interface insulation and to a predetermined distance from the operation mechanisms 15 and 29 side of the vacuum vessels 6 and 17. A treated conductive member 58 is disposed.

In the composite insulated switchgear thus configured, the electrodes 18 and 19 of the ground vacuum valves 51 and 52 are “open”, for example, the electrodes 7 and 8 of the main circuit vacuum valves 48 and 49 are “open”. In the "closed" state, the current flows from the first main circuit external terminal 10 of the main circuit vacuum valve 48-the main circuit opening / closing means 9 of the main circuit vacuum valve 48-the second main circuit external terminal 12 of the main circuit vacuum valve 48- The connection member 55 -the second main circuit external terminal 12 of the main circuit vacuum valve 49 -the main circuit opening / closing means 9 of the main circuit vacuum valve 49 -the first main circuit external terminal 10 of the main circuit vacuum valve 49 is energized. Done.
Thus, since the vacuum valves 48 to 52 and the connection members 55 and 56 between the vacuum valves 48 to 52 are integrally cast with the mold insulator 57, the space between the vacuum valves 48 to 52 can be shortened. The entire apparatus can be reduced in size.

BRIEF DESCRIPTION OF THE DRAWINGS It is an electric circuit diagram in Embodiment 1 for implementing this invention. It is sectional drawing which shows the structure of Embodiment 1 of this invention. It is sectional drawing of the III-III line of FIG. It is sectional drawing which shows the structure of Embodiment 2 of this invention. It is sectional drawing which shows the principal part of Embodiment 3 of this invention. It is sectional drawing which shows the principal part of Embodiment 4 of this invention. It is an electric circuit diagram in Example 1 to which this invention is applied. 1 is a cross-sectional view showing a main part of Example 1. FIG. It is sectional drawing of the IX-IX line of FIG. It is sectional drawing of the XX line of FIG.

Explanation of symbols

6 first vacuum vessel, 9 main circuit opening / closing means, 15 main circuit operating mechanism,
17 Second vacuum container, 20 Ground opening / closing means, 23 Ground movable shaft, 27 Test terminal,
28, 33 Insulating rod, 29 Grounding operation mechanism, 29a Grounding operation rod,
30 Mold insulator, 36 spring.

Claims (3)

A main circuit opening / closing means comprising a main circuit fixed electrode and a main circuit movable electrode, which is opened and closed by a main circuit operation mechanism, is disposed in the first vacuum vessel, and is composed of a ground fixed electrode and a ground movable electrode and is opened and closed by a ground operation mechanism The ground opening / closing means is disposed in the second vacuum vessel to electrically and mechanically connect the grounding movable shaft movable in the axial direction of the second vacuum vessel and the grounding movable electrode, and In a composite insulated switchgear that is electrically connected between the ground fixed shaft and the main circuit movable shaft, a test terminal that is electrically connected coaxially with the ground movable shaft and to which a test voltage can be applied, and the test A terminal and the grounding movable shaft are integrally cast with resin, and are connected to the grounding operation mechanism and have an insulating rod having a spring receiving portion, and are inserted into the insulating rod and received by the spring receiving portion. ,Up A spring that presses the ground movable electrode against the ground fixed electrode, an electric field relaxation shield that is disposed in the insulating rod so as to surround the test terminal, and a surface of the insulating rod that faces the electric field relaxation shield. A composite insulation switchgear comprising a conductive member.   A main circuit opening / closing means comprising a main circuit fixed electrode and a main circuit movable electrode, which is opened and closed by a main circuit operation mechanism, is disposed in the first vacuum vessel, and is composed of a ground fixed electrode and a ground movable electrode and is opened and closed by a ground operation mechanism. The ground opening / closing means is disposed in the second vacuum vessel to electrically and mechanically connect the grounding movable shaft movable in the axial direction of the second vacuum vessel and the grounding movable electrode, and In the composite insulated switchgear in which the ground fixed shaft and the main circuit movable shaft are electrically connected, the connection conductor electrically connected coaxially with the ground movable shaft and the connection conductor are integrally made of resin. An insulating rod having a spring receiving portion, a spring inserted through the insulating rod and received by the spring receiving portion, and pressing the grounding movable electrode against the grounding fixed electrode; and the grounding movable shaft; On the same axis Serial connection conductor and is electrically connected, composite insulated switchgear, characterized in that a capable of applying test terminals test voltage. The composite insulated switchgear according to claim 2, further comprising a flexible conductor disposed between the test terminal and the connection conductor.

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