JP4795219B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear, and more particularly to a gas-insulated switchgear suitable for use in the substation field of a power system that regularly performs maintenance and inspection.

Usually, a gas-insulated switchgear (hereinafter abbreviated as “GIS”) is a circuit breaker, disconnector, current transformer, etc., in a container that is filled with an insulating gas such as sulfur hexafluoride gas (SF ₆ ) and sealed. The electric devices and conductors are arranged, and the current supplied from the busbar side is sent to the load side through the conductors and each electric device.

  Among the electric devices constituting the GIS, the circuit breaker is an electric device for instantaneously interrupting the current when an excessive current flows in the electric circuit. As is well known, a circuit breaker is an insulation in which a breaker composed of a stationary contact or a movable contact is placed in a metal container, and an arc generated when the current is interrupted is filled in the container. The arc is extinguished using gas. Since the generated arc at the time of current interruption is high temperature, the portion exposed to the arc is consumed when used for many years. For this reason, it is necessary to periodically inspect and inspect the contact portion of the interrupting portion and replace it when the wear is significant.

In a GIS having such a blocking part, in order to reduce the attached area, a vertical blocking part has been arranged in a vertically formed container. In the GIS having the vertical blocking part, when performing periodic inspection of the vertical blocking part and replacement of the contact part, etc., the manhole cover provided at the upper part of the container is removed and the contact is replaced from the upper part. Doing work. (For example, see Patent Document 1)
In addition, in order to reduce the size of the GIS including the vertical blocking unit, the power supply side is connected to one side surface of the container in which the vertical blocking unit is disposed, and the load side first change is connected to the other side surface of the container. Some have both a current vessel and a second current transformer vessel. In this type of structure, the first current transformer conductor connected to the upper part of the vertical circuit breaker passes through the ring-shaped current transformer in the first current transformer container and is folded back into the container, so that the vertical circuit breaker The second current transformer conductor connected horizontally to the power supply side conductor and connected to the lower part of the vertical breaker passes through the current transformer in the second current transformer vessel and is connected to the load side. (See, for example, Patent Document 2).

  On the other hand, in a gas-insulated switchgear equipped with a lightning arrester, a disconnecting device is interposed at the connection between the busbar of the gas-insulated switchgear and the busbar on the side of the lightning arrester, and the connection between the conductors of each busbar is made through a split conductor. It has been proposed to connect the conductors by connecting cables that can be expanded and contracted (see Patent Document 4). reference).

Japanese Patent Laid-Open No. 63-2224108 JP 2005-261004 A JP-A-6-133419 JP 7-284214 A

  The first current transformer conductor passes through the ring-shaped current transformer in the first current transformer container and is folded back into the container, and is connected to the power supply side conductor across the vertical blocking portion in the horizontal direction. In the GIS having such a structure, when the vertical breaker is inspected or the contact part is exchanged, the first current transformer conductor crossing above the vertical breaker becomes an obstacle. Therefore, each time inspection or replacement work is performed, the current transformer in the first current transformer container through which the first current transformer conductor passes is removed, and then the first current transformer conductor is removed, and then the tool is removed from the manhole. It was necessary to remove the fixed contact and the movable contact. Therefore, it takes a long time for inspection and replacement work, and the replacement work of the contact portion and the like cannot be easily performed, and this improvement has been desired.

  In addition, although various structures as described above have been proposed as means for connecting the conductors of the GIS, a vertical blocking part is provided in the container to check the vertical blocking part. Even if it is intended to be used in a GIS structure for replacement, there is a problem that it cannot be easily applied to a connection portion between conductors existing in the vicinity of the vertical blocking portion.

  The object of the present invention is a GIS having a structure in which a vertical blocking part is arranged in a container that forms a manhole to be closed by a detachable cover. An object of the present invention is to provide a GIS that can easily perform the above.

  In the GIS of the present invention, a vertical blocking portion is disposed in a container in which a manhole closed by a detachable cover is formed, and a power supply side is connected to one side surface of the container, and the other side surface is connected. A first current transformer container and a second current transformer container in which a ring-shaped current transformer is disposed are respectively attached, and a first current transformer conductor connected to the upper part of the vertical blocking portion is the first current transformer conductor. The second current transformer passes through the current transformer in the current transformer container and is folded back into the container, connected to the power supply side conductor through the upper part of the vertical interrupting part, and connected to the lower part of the vertical interrupting part. When the current transformer conductor is configured to penetrate the current transformer in the second current transformer container and connect to the load side, the container is interposed between the power supply side conductor and the first current transformer conductor. An intermediate conductor is interposed at a position facing the manhole, and one end of the intermediate conductor is attached to the power supply side conductor. Together can be secured, the other end is characterized by being configured to connect detachably with said first current transformer side conductor through the fitting means.

  If the GIS is configured as in the present invention, an intermediate conductor that horizontally traverses the upper part of the vertical blocking portion at a position facing the manhole of the container when connecting the power supply side conductor and the first current transformer conductor. This intermediate conductor has one end detachably fixed to the power supply side conductor and the other end is detachably connected to the first current transformer side conductor via the fitting means. During maintenance inspections and repairs of the parts and the like, the intermediate conductor crossing above the vertical blocking part can be easily removed from the manhole. For this reason, it is possible to easily replace the contact portion of the vertical blocking portion in a short time, and there is an effect that the working efficiency can be remarkably improved as compared with the conventional case.

  In the GIS of the present invention, a vertical blocking portion is disposed in a container that forms a manhole that is closed by a detachable cover, the power supply side is connected to one side surface of the container, and the other side surface is connected to the other side surface. A first current transformer container and a second current transformer container in which a ring-shaped current transformer is disposed are respectively attached, and the first current transformer conductor connected to the upper part of the vertical blocking portion is the first current transformer conductor. The second current transformer conductor that passes through the current transformer in the current collector container and is folded back into the container, is connected to the power supply side conductor through the upper part of the vertical interrupting part, and is connected to the lower part of the vertical interrupting part. The present invention is applied to a structure that penetrates a current transformer in the second current transformer container and connects to the load side. An intermediate conductor is interposed between the power supply side conductor and the first current transformer conductor at a position opposite to the manhole of the container. The intermediate conductor is detachably fixed at one end to the power supply side conductor. The end is configured to be detachably connected to the first current transformer side conductor via fitting means.

  A GIS to which the present invention is applied is shown in FIG. 1, and a container 1 in which a vertical blocking portion 6 is disposed, and a busbar container (one on the left side of FIG. (Not shown), and a first current transformer container 2 and a second current transformer container 3 which are mounted in two stages on the upper and lower sides of the other side surface (right side in FIG. 1) of the container 1, and a second A cable head container (not shown) is arranged on the right side of the current transformer container 3 and attached. On the lower side of the container 1, an operating device 4 that is installed in a box on the gantry 15 and opens and closes the vertical blocking unit 6 is disposed. A drive portion of the operating device 4 is placed in a box on the gantry 15. Stored.

The container 1, the first current transformer container 2 and the second current transformer container 3 are generally integrated by screwing together flanges 22 attached by welding around the openings of the respective containers with bolts. . The container 1 and the current transformer containers 2 and 3 are filled with an insulating gas such as SF ₆ .

  Further, a vertical blocking section 6 and a power supply side conductor 9 are disposed in the container 1, and a primary current transformer 7 in the form of a ring is disposed in the first current transformer container 2, and A secondary current transformer 8 in the form of a ring is disposed in the two current transformer container 3. In the example of FIG. 1, the power supply side conductor 9 is supported by an insulating support 18 a attached to a metal cylinder 31 on the upper side of the vertical blocking unit 6 with a bolt or the like, and the inside of the container 1 is perpendicular to the vertical blocking unit 6 substantially in parallel. It is arranged to extend in the direction. The power supply side conductor 9 is connected to a support conductor 16 attached to each power supply side spacer 13 by a contact 23a so as to reach a conductor (not shown) of a busbar.

  The first current transformer conductor 11 is connected to the metal cylinder 31 that also serves as the connection conductor on the upper part of the vertical blocking section 6 via the upper connection conductor 20 and the contact 23b. The first current transformer conductor 11 penetrates the current transformer 7 in the first current transformer container 2 and is folded back in the container 1, and finally power is supplied via the intermediate conductor 10 as will be described later. Connected to the side conductor 9.

  Further, the lower connecting conductor 21 provided at the lower part of the vertical blocking part 6 is connected to the second current transformer conductor 12 through a contact 23c. The second current transformer conductor 12 is supported by an insulating support 18c, passes through the current transformer 8 in the second current transformer container 3, and is connected to the conductor of the load side spacer 14 through the contact 23d. The cable head (not shown) on the load side is reached. In FIG. 1, in principle, the description is given for one phase, but even in the case of three phases, the structure is the same except for the current transformer portion.

  The vertical blocking unit 6 opens and closes the contact in the vertical direction, and the fixed side is arranged at the upper part and the movable side is arranged at the lower part. The movable side is opened and closed by operating the operating device 4. The contact portion of the vertical blocking portion 6 generally has a structure shown in FIG. That is, the main part of the vertical interruption | blocking part 6 is the fixed side arc contact 25, the movable side arc contact 26, the fixed main contact 27, the movable main contact 28, the insulation nozzle 29, and cylindrical insulation support. It is composed of a material 30, a metal cylinder 31, and a puffer cylinder 32. On the inner side of the metal tube 31, an upper protrusion 31 a for fixing the fixed-side arc contact 25 and a lower protrusion 31 b for fixing the fixed main contact 27 are integrally formed.

  Both ends in the horizontal direction of the upper protrusion 31a on the inner surface of the metal cylinder 31 and the fixed-side arc contact 25 having a T-shaped cross section are fixed with bolts 50, and the lower protrusion 31b on the inner surface of the metal cylinder 31 and the fixed main contact 27 Is fixed with bolts 52. Further, a screw is provided on the inner peripheral surface of the movable main contact 28, and is screwed into a screw on the outer peripheral surface of the insulating nozzle 29. Screw on the circumference and fix. Further, the portion where the movable side arc contact 26 and the puffer cylinder 32 come into contact is threaded, and the movable side arc contact 26 is screwed to the inner peripheral surface of the puffer cylinder 32 and fixed.

  In the vertical interrupting section 6 having this structure, when the current is interrupted as described above, if the movable-side arc contact 26 is separated from the fixed-side arc contact 25, an arc is generated between both contacts. The exposed fixed-side arc contact 25, movable-side arc contact 26, and insulating nozzle 29 are consumed, so that they are periodically replaced after a certain period of use.

  As shown in FIGS. 1 and 2, the intermediate conductor 10 used for connecting the first current transformer conductor 11 and the power supply side conductor 9 crosses over the vertical blocking portion 6 of the container 1, It arrange | positions so that it may oppose. The intermediate conductor 10 has a connection surface of a connection portion 10a at one end thereof, and a fitting means 17 is fixed to the other end side with a bolt or the like.

  The intermediate conductor 10 is detachably connected to the upper end surface of the power supply side conductor 9 with a bolt 55 and the fitting means 17 is fixed to the end of the first current transformer conductor 11. It fits with the part 24 and is made detachable. Thereby, the 1st current transformer conductor 11, the intermediate conductor 10, and the power supply side conductor 9 are electrically connected, and the intermediate conductor 10 can be removed as needed.

  Further, the connecting portion 10a of the intermediate conductor 10 that is detachably fixed to the upper end surface of the power supply side conductor 9 has a holding member 19 for electric field concentration relaxation fixed to the upper portion thereof by a bolt 57. The holding member 19 is preferably made of the same material as that of the power source side conductor 9 and the intermediate conductor 10 and preferably has a spherical crown shape in order to prevent electric field concentration. Note that the holding member 19 is not necessary when the upper portion of the connecting portion 10a has a spherical crown shape.

  As described above, the bolts 55 and 57 are used as the fixing means for the connecting portion 10a and the power source side conductor 9, and the connecting portion 10a and the holding member 19. The connection portion 10a and the power supply side conductor 9 are provided with bolt holes for supporting and fixing them, and after the bolt holes are aligned, the bolts are tightened from the upper portion of the connection portion 10a to be fixed. It is desirable to provide four bolt holes, two on each side.

  For the fitting means 17, for example, a known tulip contact is used in which a large number of contact pieces are assembled and integrated by a spring. Further, in the example shown in the figure, the fitting means 17 is fixed to the intermediate conductor 10 side and the fitting connection portion 24 is fixed to the first current transformer conductor 11 side. Even if the connecting portion 24 is provided with the fitting means 17 on the first current transformer conductor 11 side, the electrical connection can be used without any change.

  The first current transformer conductor 11 passes through the vicinity of the current transformer 7 through which the conductor of the other phase passes from the power supply side conductor 9, extends in the horizontal direction, and is folded back in the first current transformer container 2, After passing through the vessel 7 in the horizontal direction, it is connected to the upper connecting conductor 20 connected to the metal cylinder 31 of the vertical blocking portion 6. The first current transformer conductor 11 is supported and fixed to the first current transformer container 2 by a bolt via an insulating support 18b. The first current transformer conductor 11 may pass through the current transformer 7 either before or after being folded in the first current transformer container 2.

  The lower connecting conductor 21 is provided with a contact 23c supported and fixed to the vertical blocking portion 6 with a bolt, and supported and fixed with a bolt on the other side. The second current transformer conductor 12 is fitted into the contact 23c, and both are connected. Yes. In FIG. 1, the lower connection conductor of the other phase, the second current transformer conductor, and the current transformer 8 are shown in the back of the lower connection conductor 21.

  When checking or replacing the detailed structure of attaching / detaching the intermediate conductor 10 and the contact portion of the vertical blocking portion 6, first, the cover 5a of the manhole 5 of the container 1 is removed, and an operator inserts a tool from the manhole 5 to The intermediate conductor 10 is removed and necessary work is performed.

  The removal of the intermediate conductor 10 will be described with reference to FIGS. During the GIS operation, as shown in FIG. 2, the intermediate conductor 10 is connected to the power-side conductor 9 including the bolts 55 and 57 and the holding member 19, and the first current transformer conductor 11 is connected by the fitting means 17. It is in a connected state.

  When removing the intermediate conductor 10, the bolt 57 is removed from the manhole 5 with a tool, and the holding member 19 is pulled upward as shown in FIG. Next, when the bolt 55 is removed to disconnect the intermediate conductor 10 from the power supply side conductor 9 and the intermediate conductor 10 is pulled out to the left in the axial direction, the fitting means 17 comes out of the fitting connection portion 24. 5 is ready to be removed.

  Next, the details of the replacement work will be described with respect to the contact portion of the vertical interrupting section 6. First, the fixed side arc contact 25 and the bolt 50 that fixes the upper protruding portion of the metal cylinder 31 are removed, and the fixed side arc contact is performed. Pull the child 25 upward. Subsequently, the bolt 52 fixing the fixed main contact 27 and the lower protrusion 31b of the metal cylinder 31 is removed, and the fixed main contact 27 is taken out upward.

  Thereafter, the insulating nozzle 29 is rotated by a tool, the movable main contact 28 and the insulating nozzle 29 are unscrewed, and the insulating nozzle 29 is taken out. Also, the puffer cylinder 32 and the movable arc contact 26 are unscrewed, and the movable arc contact 26 is taken out. The replacement of the contacts is completed by exchanging with new parts such as the extracted fixed-side arc contact 25 and movable-side arc contact 26, and assembling in the reverse order of removal. In addition, it cannot be overemphasized that it can replace | exchange if there is a consumed part, not only a contact part.

  The above work can be performed from the manhole 5 with the cover 5a removed, and even if it is a GIS that uses the vertical blocking portion 6 to reduce the installation area, it is easy to replace or perform maintenance inspection of the contact portion. Work efficiency can be greatly improved. Further, it is not necessary to provide a dedicated hand hole for exchanging the contact portion or for maintenance and inspection, and the structure of the container is simplified.

It is a longitudinal cross-sectional view which shows one Example of the gas insulated switchgear to which this invention is applied. It is sectional drawing which expands and shows the connection part of the power supply side conductor of FIG. 1, and an intermediate | middle conductor. It is a longitudinal cross-sectional view which shows the state at the time of the demolition of FIG. It is sectional drawing to which the principal part of the vertical type | mold interruption | blocking part of FIG. 1 was expanded.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... 1st current transformer container, 3 ... 2nd current transformer container, 4 ... Operation device, 5 ... Manhole, 5a ... Cover, 6 ... Vertical interruption | blocking part, 7, 8 ... Current transformer, DESCRIPTION OF SYMBOLS 9 ... Power supply side conductor, 10 ... Intermediate conductor, 10a ... Connection part, 11 ... 1st current transformer conductor, 12 ... 2nd current transformer conductor 17 ... Fitting means, 25 ... Fixed side arc contact, 26 ... Movable Side arc contact, 27 ... fixed main contact, 28 ... movable main contact, 29 ... insulating nozzle.

Claims (1)

  A vertical blocking part is arranged in a container that forms a manhole that is closed by a detachable cover, and a power supply side is connected to one side of the container, and a ring-shaped part is formed inside the other side. A first current transformer container and a second current transformer container in which current transformers are arranged are respectively attached, and a first current transformer conductor connected to an upper part of the vertical blocking portion is provided in the first current transformer container. The second current transformer conductor that passes through the current transformer and is folded back into the container, connected to the power supply side conductor through the upper part of the vertical interrupting part, and connected to the lower part of the vertical interrupting part, In a gas-insulated switchgear that passes through a current transformer in a second current transformer container and is connected to a load side, the manhole of the container is opposed between the power supply side conductor and the first current transformer conductor. An intermediate conductor is interposed at a position, and one end of the intermediate conductor is detachably fixed to the power supply side conductor. While, the other end gas-insulated switchgear apparatus characterized by being configured to connect detachably with said first current transformer side conductor through the fitting means.

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