JP4953898B2 - Switchgear - Google Patents

Description

  The present invention relates to a switchgear used in a power system such as power generation / transformation.

  2. Description of the Related Art Conventionally, a switchgear includes a main contact portion having a fixed contact and a movable contact contacting and separating from the fixed contact, and a pressure vessel that houses the main contact and is filled with an insulating gas. Such an opening / closing device is often provided with an operation mechanism that opens and closes the main contact portion by moving the movable contact forward and backward with respect to the fixed contact.

  This operation mechanism is generally configured to be driven by a hydraulic type using a stored energy medium, and is connected to a movable contact via an electrically insulated insulating rod or a link mechanism. Then, in response to an operation command issued in the event of a power system accident or the like, the hydraulic operation mechanism operates to open the main contact portion, thereby interrupting the accident current (see, for example, Patent Document 1).

JP 2003-264914 A

  However, according to the conventional opening / closing device as described above, the hydraulic operation mechanism is provided in the operation mechanism box provided in the lower part (vertically below) of the pressure vessel. In addition to the hydraulic operation mechanism, the operation mechanism box also accommodates auxiliary devices for the operation mechanism.

  As described above, in the conventional opening / closing device, the operation mechanism box is arranged vertically below the pressure vessel and the operation mechanism is accommodated therein, so that the height of the device (height of the pressure vessel) is high. There was a problem. In particular, in the case of a switchgear with a system in which the busbar (constituted with a conductor arranged inside the tank) is connected to the pressure vessel, when the height is an obstacle, and it is installed indoors, etc. It was not an easy task. In addition, the height of the equipment has become an obstacle during transportation and maintenance inspection.

  As another conventional opening / closing device, there is one in which an operation mechanism box is arranged at one end of a long pressure vessel. In the case where the operation mechanism box is disposed at one end of such a pressure vessel, the height of the device (pressure vessel height) does not increase, but the length of the device increases and a large installation space is required. This is a problem because it reduces the degree of freedom of arrangement of other devices arranged around.

  The present invention has been made to solve the above-described problems, and transports the apparatus from the installation surface at a low height (pressure vessel height) without requiring a large installation space. It is another object of the present invention to provide a switching device that facilitates maintenance and inspection and increases the degree of freedom of arrangement of other devices arranged around.

In order to solve the above-described problems and achieve the object, the switchgear of the present invention includes a main contact portion having a fixed contact and a movable contact contacting and separating from the fixed contact, and a moving direction of the movable contact. A pressure vessel that is long, accommodates the main contact portion in an insulated state and is filled with an insulating gas, and is installed with the longitudinal direction horizontal, and a connection made of an insulating material provided above the pressure vessel. An operating mechanism connected to the movable contactor via a mechanism, and extends vertically upward from one end of the pressure vessel, reaches a first height, and then bends to the side at a right angle, and further to the pressure vessel side After that, the first busbar extending horizontally and the other end of the pressure vessel extend vertically upward, reach a second height higher than the first height, then bend at a right angle to the pressure vessel side, and then , and a second bus bar extending horizontally Operating mechanism is disposed at the same height as the first bus and schematic, wherein the pinched is disposed between the first busbar extending from adjacent other switching devices.

Another switchgear according to the present invention includes a circuit breaker having a main contact portion having a fixed contact and a movable contact contacting and separating from the fixed contact, a disconnector connected to the circuit breaker, and a movable contact. A pressure vessel installed in a state where the longitudinal direction is horizontal, and is provided above the pressure vessel. , An operating mechanism connected to the movable contactor via a connecting mechanism made of an insulating material, and vertically extending from one end of the pressure vessel, reaching a first height, and then bent at a right angle to the side once. Bends at right angles to the pressure vessel side, and then extends vertically upward from the first busbar extending in the horizontal direction and the other end of the pressure vessel, and after reaching a second height higher than the first height, A second bus that bends at a right angle and then extends horizontally It comprises the operation mechanism is arranged at the same height as the first bus and schematic, wherein the pinched is disposed between the first busbar extending from adjacent other switching devices.

  According to this invention, since the operation mechanism is provided above the pressure vessel, the height of the device from the installation surface (height of the pressure vessel) is reduced without requiring a wide installation space, There is an effect of facilitating transportation and maintenance and increasing the degree of freedom of arrangement of other devices arranged around.

  DESCRIPTION OF EMBODIMENTS Embodiments of a switchgear according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the structure of Embodiment 1 of the switchgear according to the present invention. FIG. 2 is an enlarged cross-sectional view of a main part in which the vicinity of the circuit breaker of the switchgear of FIG. FIG. 3 is a side view of the switchgear of FIG. FIG. 4 is a plan view of the switchgear of FIG.

  In FIG. 1, the switchgear 100 is connected to the circuit breaker 10 provided at the center of the pressure vessel 40 and the circuit breakers 10 provided at both ends of the pressure vessel 40 by high-voltage center conductors (internal conductors) 11. The first disconnector 21 and the second disconnector 22, the pressure vessel 40 that accommodates the breaker 10 and the disconnectors 21 and 22, and the operation mechanism that opens the breaker 10 in response to an external operation command. 50. The operation mechanism 50 is accommodated in an operation mechanism box 51 provided on the upper portion of the pressure vessel 40. The circuit breaker 10 and the operation mechanism 50 are connected by a connection mechanism 6.

  The pressure vessel 40 has a long bottomed cylindrical shape, and is installed with a pair of support legs 46 so that the axis is horizontal at a position where the height h is raised from the installation surface. Further, the pressure vessel 40 is installed such that the high-voltage center conductor (inner conductor) 11 extending from the circuit breaker 10 to the first disconnector 21 and the second disconnector 22 is horizontal. Furthermore, the pressure vessel 40 is installed such that the operation direction of a movable main contact of the circuit breaker 10 to be described later is horizontal.

  Busbars 31 and 32 (consisting of a high-voltage conductor and a container that accommodates the high-voltage conductor) 31 and 32 connected to the disconnectors 21 and 22 extend vertically upward from the disconnectors 21 and 22 at both ends of the pressure vessel 40, respectively. After extending and reaching a predetermined height (the bus bar 32 is higher than the bus bar 31), it bends at right angles to the pressure vessel 40 side, and then extends horizontally. That is, the bus bars 31 and 32 extend so as to be parallel (horizontal) to the pressure vessel 40 above a predetermined distance from the pressure vessel 40. An operation mechanism box 51 that houses the operation mechanism 50 is disposed at substantially the same height as the bus bars 31 and 32.

  More specifically, the first bus bar 31 extending from the first disconnector 21 extends vertically upward from one end of the pressure vessel 40, and once reaches the first height, it is temporarily lateral (front side in FIG. 1). , Bent at a right angle to the pressure vessel 40, bent at a right angle toward the pressure vessel 40, and then extended horizontally. On the other hand, the second bus bar 32 extending from the second disconnector 22 extends vertically upward from the other end of the pressure vessel 40, reaches a second height higher than the first height, and then is perpendicular to the pressure vessel 40 side. It then bends and then extends horizontally. As shown in FIGS. 3 and 4, a plurality of opening / closing devices 100 are provided, and the first bus 31 and the second bus 32 extending from each pressure vessel 40 have a first height and a second height, respectively. It is extended while keeping parallel at the height of. The operation mechanism box 51 is provided at a first height and is disposed so as to be sandwiched between the first bus 31 extending from the own device and the first bus 31 extending from the adjacent device. With this arrangement, the installation space is made compact.

  In FIG. 2, the circuit breaker 10 is held at both ends of the main contact portion 1 composed of a movable main contact (movable contact) 1a and a fixed main contact (fixed contact) 1b, and the movable main contact 1a and the fixed main contact 1b. Equipped with an inter-electrode insulating support cylinder 2 and the like. The main contact portion 1 is configured such that the movable main contact 1a that can move on the central axis of the pressure vessel 40 and the fixed main contact 1b are close to each other and face each other, and both can be contacted and separated.

  The movable main contact 1a is connected to a coupling mechanism 6 including at least a part of an insulating rod 4 made of an insulating member and a link mechanism 5, and is operated by an operation mechanism 50 disposed above the pressure vessel 40. The operating mechanism 50 is driven by a stored energy medium, and in the event of a power system accident or the like, the main contact portion 1 is opened to cut off the current. The circuit breaker 10 is supported by the frame 13.

  The frame 13 is insulated and supported by the insulating support cylinder 15 at a position elevated by a predetermined distance from the upper center of the pressure vessel 40. The connecting mechanism 6 is connected to the movable main contact 1 a and is provided in the frame 13, and is connected to the operating mechanism 50 through the inside of the insulating support cylinder 15. The operation driving force applied to the operation mechanism 50 is transmitted to the movable main contact 1a through the coupling mechanism 6. The operation driving force transmitted to the movable main contact 1a causes the movable main contact 1a to move back and forth in the axial direction (advancement / retraction operation) to be brought into and out of contact with the fixed main contact 1b.

  Returning to FIG. 1, the pressure vessel 40 includes a first pressure vessel 41 that houses the circuit breaker 10 and two second pressure vessels 42 that house the disconnectors 21 and 22. Flange portions 41 a and 42 a are formed at the joining end portions of the first pressure vessel 41 and the second pressure vessel 42, respectively.

  An annular plate-like partition member 43 is interposed between the flange portions 41a and 42a. An insulating spacer 44 that insulates and supports the high-voltage center conductor (inner conductor) 11 is provided in the central hole portion of the partition member 43. The partition member 43 is fixed integrally with the first and second pressure vessels 41 and 42 by fixing means such as bolts and nuts (not shown), and divides the inside of the pressure vessel into three gas sections A, B, and C. . Each of the three gas sections A, B, and C is filled with an insulating gas such as SF6 gas. In the gas section A, devices such as the current transformer 25 are also stored.

  In the operation mechanism box 51, a hydraulic operation mechanism 50 and auxiliary devices (not shown) of the hydraulic operation mechanism 50 are accommodated. In response to an operation command in the event of an electric power system accident or the like, the hydraulic operation mechanism 50 operates and the main contact portion 1 is opened to interrupt the accident current. The operation mechanism box 51 that houses the hydraulic operation mechanism 50 and its auxiliary devices is arranged and configured on the upper side of the pressure vessel 40 as described above.

  In the opening / closing device 100 of the present embodiment, since the operation mechanism 50 is provided vertically above the pressure vessel 40 that is long in the horizontal direction, the arrangement of the devices is compact and requires a large installation space. There is no. And the height (pressure vessel height) h of the device from the installation surface can be made lower than the conventional one, thereby facilitating transportation and maintenance, and arranging other devices arranged around the device. Increase the degree of freedom.

Embodiment 2. FIG.
In the second embodiment, a resistance contact portion to which a resistor is connected is connected in parallel to a main contact portion to reduce a surge at the time of recharging. FIG. 5 is a cross-sectional view showing the structure of Embodiment 2 of the switchgear according to the present invention. FIG. 6 is an enlarged cross-sectional view of a main part in which the vicinity of the circuit breaker of the switchgear of FIG. 5 and 6, in the switchgear 100A of the present embodiment, the circuit breaker 10A has a resistance contact portion 3 in addition to the configuration of the circuit breaker 10 of the first embodiment. The resistive contact portion 3 is connected in parallel to the main contact portion 1. A resistor 9 is connected to the resistance contact portion 3 in series.

  In FIG. 6, the circuit breaker 10 </ b> A includes a main contact portion 1 composed of a movable main contact 1 a and a fixed main contact 1 b, an interelectrode insulating support cylinder 2 held at both ends, a movable resistance contact, and a movable main contact 1 a and a fixed main contact 1 b. 3a and a fixed resistance contact 3b, and a resistance contact 3 provided above the main contact 1 is provided. The main contact portion 1 is configured such that the movable main contact 1a that can move on the central axis of the pressure vessel 40 and the fixed main contact 1b are close to each other and face each other, and both can be contacted and separated. Further, the resistance contact portion 3 is configured such that the movable resistance contact 3a and the fixed resistance contact 3b that can move on the parallel axis of the pressure vessel 40 are close to each other and face each other, and both can be contacted and separated. .

  The main contact portion 1 and the resistance contact portion 3 close the resistance contact portion 3 prior to the closing of the main contact portion 1 when the high voltage center conductor 11 is closed, and the resistance contact portion when the high voltage center conductor 11 is opened. 3 is operated prior to the opening of the main contact portion 1.

  The movable main contact 1 a and the movable resistance contact 3 a are connected to a coupling mechanism 6 including an insulating rod 4 and a link mechanism 5, and are operated by an operation mechanism 50 disposed above the pressure vessel 40. The operating mechanism 50 is driven by a stored energy medium, and in the event of a power system accident or the like, the main contact portion 1 is opened to cut off the current.

  The connection mechanism 6 is connected to the movable main contact 1 a and the movable resistance contact 3 a and is provided in the frame 13, and is connected to the operation mechanism 50 through the inside of the insulating support cylinder 15. The operation driving force applied to the operation mechanism 50 is transmitted to the movable main contact 1a and the movable resistance contact 3a via the coupling mechanism 6. The operation driving force transmitted to the movable main contact 1a and the movable resistance contact 3a causes the movable main contact 1a and the movable resistance contact 3a to move forward and backward in the axial direction (advance and retreat operation) to contact the fixed main contact 1b and the fixed resistance contact 3b. Let go.

  In the switchgear 100A of the present embodiment, at the time of turning on, the overvoltage is suppressed by turning on the resistance contact portion 3 prior to turning on the main contact portion 1, and the main contact portion 1 is turned on after about 10 ms. Moreover, at the time of interruption | blocking, interruption | blocking of the main contact part 1 is completed prior to interruption | blocking of the resistance contact part 3, and interruption | blocking surge can be reduced by performing interruption | blocking of the resistance contact part 3 about 10 ms later.

  As described above, the switchgear according to the present invention is useful for switchgears used in power systems such as power generation and substation, and is particularly arranged around the apparatus with a low height from the installation surface. It is suitable for switchgear that requires expansion of the degree of freedom of arrangement of other equipment.

It is a cross-sectional view which shows the structure of Embodiment 1 of the switchgear concerning this invention. It is a principal part expanded sectional view which expanded and showed the cross-section vicinity of the circuit breaker of the switchgear of FIG. It is a side view of the switchgear of FIG. It is a top view of the switchgear of FIG. It is a cross-sectional view which shows the structure of Embodiment 2 of the switchgear concerning this invention. It is the principal part expanded sectional view which expanded the cross-section vicinity of the circuit breaker of FIG.

Explanation of symbols

1 Main contact 1a Movable main contact (movable contact)
1b Fixed main contact (fixed contact)
2 Insulating support cylinder between electrodes 3 Resistance contact part 3a Movable resistance contact 3b Fixed resistance contact 4 Insulating rod 5 Link mechanism 6 Connection mechanism 9 Resistor 10, 10A Breaker 11 High voltage center conductor (internal conductor)
13 Frame 15 Insulating support cylinder 21 First disconnector 22 Second disconnector 25 Current transformer 31 First bus 32 Second bus 32 Bus 40 Pressure vessel 41 First pressure vessel 42 Second pressure vessel 41a, 42a Flange portion 43 Partition Member 44 Insulating spacer 46 Support leg 50 Hydraulic operation mechanism 51 Operation mechanism box 100, 100A Opening / closing device

Claims (6)

A main contact portion having a stationary contact and a movable contact contacting and separating from the stationary contact;
A pressure vessel that is elongated in the moving direction of the movable contact, is housed in an insulated state inside the main contact portion, is filled with an insulating gas, and is installed with the longitudinal direction horizontal;
An operating mechanism provided above the pressure vessel and connected to the movable contact via a connecting mechanism made of an insulating material ;
After extending vertically upward from one end of the pressure vessel and reaching a first height, it is once bent at a right angle to the side, further bent at a right angle to the pressure vessel side, and then a first busbar extending in the horizontal direction,
A second bus bar extending vertically upward from the other end of the pressure vessel, reaching a second height higher than the first height, bent at a right angle to the pressure vessel side, and then extending horizontally,
Equipped with a,
The opening / closing device, wherein the operating mechanism is disposed at substantially the same height as the first bus bar, and is disposed between the first bus bar extending from another adjacent switching device. It has a fixed resistance contact and a movable resistance contact that contacts and separates from the fixed resistance contact, and further includes a resistance contact portion connected in parallel with the main contact portion and having a resistor connected in series. The switchgear according to claim 1. The switchgear according to claim 1 or 2, wherein the operation mechanism is driven by a stored energy medium. The operating mechanism is housed in an operating mechanism box provided at the top of the pressure vessel,
The switchgear according to any one of claims 1 to 3, wherein the operation mechanism box also accommodates auxiliary devices of the operation mechanism. A circuit breaker having a main contact portion having a stationary contact and a movable contact contacting and leaving the stationary contact;
A disconnector connected to the breaker;
A pressure vessel that is long in the moving direction of the movable contact, is housed in an insulated state with the breaker and disconnector inside, and is filled with an insulating gas, and is installed with the longitudinal direction set horizontally;
An operating mechanism provided above the pressure vessel and connected to the movable contact via a connecting mechanism made of an insulating material ;
After extending vertically upward from one end of the pressure vessel and reaching a first height, it is once bent at a right angle to the side, further bent at a right angle to the pressure vessel side, and then a first busbar extending in the horizontal direction,
A second bus bar extending vertically upward from the other end of the pressure vessel, reaching a second height higher than the first height, bent at a right angle to the pressure vessel side, and then extending horizontally,
Equipped with a,
The opening / closing device, wherein the operating mechanism is disposed at substantially the same height as the first bus bar, and is disposed between the first bus bar extending from another adjacent switching device. The switchgear according to claim 5 , wherein a high-voltage conductor extending between the circuit breaker and the disconnecting switch extends in a horizontal direction.

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