JP4790524B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a 1-1 / 2 CB type gas insulated switchgear, and more particularly to its arrangement.

  As a circuit system of the gas insulated switchgear, a bus system having a so-called 1-1 / 2 CB (breaker) configuration may be adopted when high reliability is required in a large-capacity substation or the like. In this bus-insulated gas-insulated switchgear, three circuit breakers forming a unit configuration are arranged in series between a pair of main buses. In other words, three circuit breakers are used for drawing out two lines so that the system will not be affected even in the event of a bus accident, and consideration will be given not to stop the line when checking circuit breakers. This is the method. As a conventional technique employing such a 1-1 / 2 CB configuration, for example, first, second and third circuit breakers each having a disconnector on each side are electrically connected in series, and the first and second Each of the three circuit breakers has one end connected to the main bus, and a branch bus is derived from between the first circuit breaker and the second circuit breaker and between the second circuit breaker and the third circuit breaker. In the gas insulated switchgear, the gas insulation is provided with a bi-directional branch at one of the opposing disconnectors attached to the first, second, and third circuit breakers, and a branch bus connected to the branch portion. A switchgear is disclosed.

JP 2002-186124 A (2nd page, FIG. 1)

  In the conventional gas-insulated switchgear having a 1-1 / 2 CB configuration shown in Patent Document 1, three circuit breakers are coaxially arranged in series between a pair of main buses, so that the dimension in the circuit breaker axial direction is large. Therefore, the entire gas insulated switchgear requires a large installation area. In substations where gas-insulated switchgears are installed, there is a strong demand for reducing the installation area due to the difficulty of acquiring construction site if it is outdoors, and it is determined because of limited space in buildings if it is indoors. It was a big issue how to improve the storage efficiency in the space.

  The present invention has been made to solve the above-described problems. In the gas-insulated switchgear having a 1-1 / 2 CB configuration, the installation area can be reduced particularly by reducing the arrangement dimension in the breaker axial direction. An object of the present invention is to provide a gas insulated switchgear.

In the gas-insulated switchgear according to the present invention, the first, second and third circuit breakers provided with disconnectors on both sides between the first and second main buses arranged in parallel are electrically connected. In a gas-insulated switchgear that is connected in series and from which a branch line for transferring power is derived between the first circuit breaker and the second circuit breaker and between the second circuit breaker and the third circuit breaker. The breaker of the base is arranged side by side in the longitudinal direction of the main bus with its axis line oriented in a direction orthogonal to the longitudinal direction of the main bus, and the branch line includes the first breaker and the second breaker, and Each of the horizontal circuit connecting the second circuit breaker and the third circuit breaker is led out by a cable via a branch line disconnector and a cable head, and the cable head is a main bus line close to the horizontal circuit. It is arranged on the side .
Further, in the same configuration as described above up to the front stage of the cable head, the cable head is disposed on the opposite side of the main bus side close to the horizontal electric circuit.

According to the gas-insulated switchgear of the present invention, in the gas-insulated switchgear having a 1-1 / 2 CB configuration, the three circuit breakers are oriented in the direction perpendicular to the longitudinal direction of the main busbar, and the length of the main busbar is set. The branch lines are arranged side by side , and branch lines are connected to the first circuit breaker, the second circuit breaker, and the horizontal circuit connecting the second circuit breaker and the third circuit breaker. and extraction by a cable through the cable head, cable head, so arranged on the main bus side adjacent to the horizontal path, can reduce the size between the two main buses that breaker is arranged, also, the cable head Can be easily inspected from the outside of the device, and a gas insulated switchgear capable of reducing the installation area of the entire device can be obtained. Therefore, applicability within a limited installation range is improved in an installation environment that requires dimensional restrictions.
In addition, in the case where the cable head is arranged on the opposite side of the main bus side close to the horizontal electric circuit, since the protrusion to the outside of the device is reduced, the dimension between the two main bus lines where the circuit breaker is arranged is as described above. It can be further reduced.

Embodiment 1 FIG.
Hereinafter, the present invention will be described with reference to the drawings. 1 is a plan view showing a configuration of a gas insulated switchgear according to Embodiment 1. FIG. 2 is a side view (II-II arrow view) seen from the direction of arrow II-II in FIG. 1, and similarly, FIG. 3 is a III-III arrow view, FIG. 4 is an IV-IV arrow view, FIG. 5 is a VV arrow view, and FIG. 6 is a VI-VI arrow view. FIG. 7 is a single-line connection diagram of the gas-insulated switchgear according to the first embodiment. First, the overall device configuration will be described with reference to FIG.

  As shown in the single line connection diagram of FIG. 7, a first circuit breaker 3, a second circuit breaker 4, and a third circuit breaker 5 are provided between the first main bus 1 and the second main bus 2. Are connected in series. Disconnectors 11, 12 and current transformers 13, 14 are attached to both ends of the first circuit breaker 3. Similarly, disconnectors 21, 22 and current transformers are attached to both ends of the second circuit breaker 4. 23 and 24, disconnectors 31 and 32 and current transformers 33 and 34 are attached to both ends of the third circuit breaker 5, respectively. In order to draw the main circuit to the outside such as a power transmission line or a transformer, a cable head 42 is provided from the connection part of the disconnector 12 and the disconnector 21 via the branch line disconnector 41, and the branch line is derived by the cable. Has been. Similarly, a cable head 44 is provided from a connecting portion between the disconnector 22 and the disconnector 31 via a branch line disconnector 43, and a branch line is led out by the cable. This is a bus system called a so-called 1-1 / 2CB (breaker).

The lead-out of the branch line is not necessarily limited to the cable, and an air bushing may be used. Although this embodiment will be described as a cable drawer, in the case of an air bushing, the cable heads 42 and 44 are air bushings.
In the figure, each disconnecting switch is shown with a grounding switch. However, whether or not the grounding switch is attached is not a main part of the present invention, and therefore, in the following description, these will be simply described as disconnecting switches.

Next, an arrangement configuration of devices, which is a characteristic part of the present invention, will be described with reference to FIGS.
FIG. 1 is a plan view, which is displayed by changing the direction by 90 degrees from the connection diagram of FIG. One line with a reference numeral in the figure will be described. As shown in the figure, a horizontal first circuit breaker 3 arranged horizontally on the ground between a three-phase collective first main bus 1 and a second main bus 2 arranged in parallel. , The second circuit breaker 4 and the third circuit breaker 5 are arranged in the longitudinal direction of the main buses 1 and 2 with their axes oriented in a direction perpendicular to the longitudinal direction of the main buses 1 and 2. Are arranged side by side. The three circuit breakers 3 to 5 are connected in series, with one end of the first circuit breaker 3 connected to the first main bus 1 and one end of the third circuit breaker 5 connected to the second main bus 2. ing.

The 1st circuit breaker 3 and the 2nd circuit breaker 4, and the 2nd circuit breaker 4 and the 3rd circuit breaker 5 are each connected by the horizontal electric circuit, and the disconnector for branch lines is connected to each horizontal electric circuit part 41 and 43 are provided, and branch lines are led out by cables via cable heads 42 and 44, respectively. In addition, all devices, such as a circuit breaker and a disconnector shown in the figure, are three-phase devices.
Next, each part will be described in more detail with reference to side views of the parts corresponding to the planar arrangement of FIG.

FIG. 2 (II-II arrow view of FIG. 1) is a side view of a portion of the first circuit breaker 3. As shown in FIGS . 2 to 6 , both main buses 1 and 2 are arranged in parallel, but the height direction is such that the second main bus 2 is arranged higher than the first main bus 1. Yes. A disconnector 11 is connected to the first main bus 1, and a short bus 15 extending in the horizontal direction in a direction orthogonal to the longitudinal direction of the main bus 1 is connected to the disconnector 11. A first circuit breaker 3 in which a current transformer 13 is directly connected on the axis is arranged. On the other end side of the first circuit breaker 3, a current transformer 14 is attached vertically upward, and a disconnector 12 is installed above the current transformer 14.

  Next, the intermediate part of the 1st circuit breaker 3 and the 2nd circuit breaker 4 is demonstrated with FIG. 3 (III-III arrow line view of FIG. 1). The disconnector 12 on the first circuit breaker 3 side and the disconnector 21 on the second circuit breaker 4 side are connected by a horizontal electric circuit, and a branch line disconnector 41 is disposed in the horizontal electric circuit. Actually, the conductor constituting the horizontal electric circuit is incorporated in the branch line disconnector 41 together with the disconnection point contact of the branch line disconnector 41, and therefore does not appear in the figure. The disconnectors 12, 41, and 21 are connected side by side (see FIG. 1). This is a structure adopted to connect the circuit breakers 3 and 4 at a distance as short as possible, and if there is a sufficient installation area in the longitudinal direction of the main buses 1 and 2, A short bus connecting the disconnector 12 and the disconnector 21 may be used, and a branch line disconnector 41 may be provided in the middle of the short bus.

  A cable head 42 is connected to the branch line disconnector 41, and a cable is drawn out as a branch line toward the floor surface vertically below. The cable head 42 is arranged on the side of the main busbar adjacent to the horizontal electric circuit, that is, in this case, the second main busbar 2 side.

  Next, the part of the 2nd circuit breaker 4 is demonstrated with the IV-IV arrow line view of FIG. A current transformer 23 is disposed vertically below the disconnector 21 connected to the branch line disconnector 41 and connected to one end of the second circuit breaker 4. And the current transformer 24 is provided in the other end side of the 2nd circuit breaker 4 arrange | positioned horizontally, Furthermore, the disconnector 22 is connected via the short bus line 25 which goes to the perpendicular upper direction.

  As shown in the V-V arrow view of FIG. 5, the branch line disconnecting device 43 is connected to the horizontal electric circuit connecting the disconnecting device 22 and the disconnecting device 31 on the next third circuit breaker 5 side. The cable head 44 is connected to the branch line disconnector 43. As in the case of FIG. 3, the horizontal electric circuit portion is provided through the inside of the branch line disconnector 43 in the direction perpendicular to the paper surface in order to make the shortest connection. Not. The cable head 44 is disposed on the side of the main busbar adjacent to the horizontal electric circuit, that is, in this case, the first main busbar 1 side. And the cable which is a branch line is pulled out toward the floor surface.

  Further, as shown in the VI-VI arrow view of FIG. 6, the branch line disconnector 43 is connected to the disconnector 31 attached to the third circuit breaker 5. It is connected to one end side of the third circuit breaker 5 arranged on the same axis in the horizontal direction via a short bus 35 directed vertically downward and a current transformer 33 arranged in the horizontal direction. The other end side of the third circuit breaker 5 is connected to one end of the disconnector 32 through a current transformer 34 arranged vertically upward. The other end of the disconnector 32 is connected to a second main bus 2 disposed at the same height as the disconnector 32 via a short bus 36 extending in the horizontal direction.

  As described above, the gas insulated switchgear according to the present invention includes the first circuit breaker 3 and the second circuit breaker 4 between the first main bus 1 and the second main bus 2 arranged in parallel. The third circuit breaker 5 is bent twice in a U shape as viewed from above so as to reciprocate between the main buses 1 and 2, and is electrically connected in series. It has characteristics.

  As described above, according to the invention of the first embodiment, in the gas-insulated switchgear having the 1-1 / 2 CB configuration, the three circuit breakers are oriented with the axis thereof in the direction orthogonal to the longitudinal direction of the main bus. Since the main busbars are arranged side by side in the longitudinal direction, it is possible to reduce the size between the two main busbars where the circuit breakers are arranged, and to obtain a gas insulated switchgear that can reduce the installation area of the entire device. Therefore, for example, when used in an indoor substation facility or the like, it is possible to provide a gas insulated switchgear with improved applicability within a limited installation range and excellent economy.

  Further, the branch line includes a branch line disconnector and a cable head from each horizontal electric circuit connecting the first circuit breaker and the second circuit breaker, and the second circuit breaker and the third circuit breaker. In addition to the above effects, the cable head can be easily inspected from the outside of the equipment, and between adjacent circuit breakers, because the cable head is arranged on the main bus side close to the horizontal electric circuit. The space formed in can be used as an inspection space.

Embodiment 2. FIG.
FIG. 8 is a plan view showing the configuration of the gas insulated switchgear according to the second embodiment. 9 is a side view as viewed from the direction of arrows IX-IX in FIG. 8 (viewed in the direction of arrows IX-IX). Similarly, FIG. 10 is a view in the direction of arrows XX, FIG. 12 is a view taken in the direction of arrow XII-XII, and FIG. 13 is a view taken in the direction of arrow XIII-XIII. FIG. 14 is a single line connection diagram of the gas insulated switchgear according to the second embodiment.
The invention of the present embodiment is the same as that of the first embodiment except that the branch line drawing direction is different. Therefore, the same parts are denoted by the same reference numerals and the description thereof will be omitted, and different parts will be mainly described.

  First, if described with reference to the single-line connection diagram of FIG. 14, the electrical connection itself is equivalent to the single-line connection diagram of FIG. 7 of the first embodiment, and the difference is that the main busbar where the branch line is close to the horizontal electric circuit This is a point derived from the opposite side. Hereinafter, this difference will be specifically described with a plan view and a side view.

  As shown in the plan view of FIG. 8, the horizontal first breaker 3, the second breaker are arranged between the three-phase collective first main bus 1 and the second main bus 2 arranged in parallel. The three circuit breakers, the circuit breaker 4 and the third circuit breaker 5, are arranged side by side in the longitudinal direction of the main bus line, with their axes directed in a direction perpendicular to the longitudinal direction of the main bus lines 1 and 2. The point which connects the one end of a circuit breaker with the horizontal electric circuit via the disconnector attached to each circuit breaker is equivalent to FIG. 1 of Embodiment 1. FIG. In the present embodiment, the cable heads 42 and 44 that are led out from the horizontal electric circuit via the branch line disconnectors 41 and 43 are arranged on the side opposite to the main bus side that is close to the horizontal electric circuit.

This will be described in more detail with a side view. 9 is equivalent to FIG. 2 of the first embodiment, and the description thereof is omitted.
10, a branch line disconnecting device 41 is disposed on a horizontal electric circuit connecting the disconnecting device 12 on the first circuit breaker 3 side and the disconnecting device 21 on the second circuit breaker 4 side. ing. Actually, as described in the first embodiment, the conductor of the horizontal electric circuit portion is built in the branch line disconnector 41 together with the disconnection point contact of the branch line disconnector 41. The tank is arranged in a direction perpendicular to the paper surface in the figure, but does not appear in the figure.
A cable head 42 is connected to the branch line disconnector 41. The cable head 42 is arranged on the opposite side to the adjacent main bus, that is, in this case, the adjacent main bus 2 is the second main bus 2 with respect to the horizontal electric circuit. And the cable is pulled out toward the floor surface.

The next view taken along the line XI-XI shown in FIG. 11 is a portion of the second circuit breaker 4, which is the same as FIG.
Further, as shown in the XII-XII arrow view of FIG. 12, between the disconnecting device 22 attached to the second circuit breaker 4 and the disconnecting device 31 attached to the third circuit breaker 5, A branch line disconnector 43 having a built-in horizontal electric circuit is provided. A cable head 44 is connected to the branch line disconnector 43. The cable head 44 is opposite to the main busbar adjacent to the horizontal electric circuit, that is, in this case, the adjacent main busbar is the first main busbar. Since it is 1, it is arranged on the opposite side.
Hereinafter, as shown in the XIII-XIII arrow view of FIG. 13, the disconnector 32 is connected via the disconnector 31, the short bus 35, the current transformer 33, the third circuit breaker 5, and the current transformer 34. It is connected to the second main bus 2 via a short bus 36.

  As described above, according to the second embodiment of the present invention, in the gas-insulated switchgear having the 1-1 / 2 CB configuration, the three circuit breakers are oriented with the axis thereof orthogonal to the longitudinal direction of the main bus. , Arranged side by side in the longitudinal direction of the main busbar, the branch line from each horizontal electric circuit connecting the first circuit breaker and the second circuit breaker, and the second circuit breaker and the third circuit breaker Since the cable head is pulled out by the cable through the branch line disconnector and the cable head, and the cable head is arranged on the opposite side of the main bus side adjacent to the horizontal electric circuit, the protrusion to the outside of the device is reduced, so the circuit breaker The dimension between the two main bus bars for arranging can be further reduced as compared with the case of the first embodiment. For this reason, the applicability with respect to the dimensional restriction on the installation range is further improved in the installation environment requiring the dimensional restriction.

It is a top view which shows the structure of the gas insulated switchgear by Embodiment 1 of this invention. It is the side view seen from the arrow II-II of FIG. It is the side view seen from the arrow III-III of FIG. It is the side view seen from arrow IV-IV of FIG. It is the side view seen from the arrow VV of FIG. It is the side view seen from the arrow VI-VI of FIG. It is a single wire connection diagram of the gas insulation switchgear by Embodiment 1 of the present invention. It is a top view which shows the structure of the gas insulated switchgear by Embodiment 2 of this invention. It is the side view seen from the arrow IX-IX of FIG. It is the side view seen from arrow XX of FIG. It is the side view seen from the arrow XI-XI of FIG. It is the side view seen from the arrow XII-XII of FIG. It is the side view seen from the arrow XIII-XIII of FIG. It is a single wire connection diagram of the gas insulation switchgear by Embodiment 2 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st main bus line 2 2nd main bus line 3 1st circuit breaker 4 2nd circuit breaker 5 3rd circuit breaker 11,12 Disconnector 13,14 Current transformer 15 Short bus line 21,22 Disconnector 23 , 24 Current transformer 25 Short bus 31,32 Disconnector 33,34 Current transformer 35,36 Short bus 41,43 Branch line disconnector 42,44 Cable head.

Claims (2)

Between the first and second main buses arranged in parallel, first, second and third circuit breakers each having a disconnector on both sides are electrically connected in series, and the first circuit breaker In the gas insulated switchgear from which the branch line which sends and receives electric power from between the 2nd circuit breaker and the 2nd circuit breaker and the 3rd circuit breaker was derived,
The three circuit breakers are arranged side by side in the longitudinal direction of the two main buses with the axis thereof in a direction perpendicular to the longitudinal direction of the two main buses, and the branch line is connected to the first circuit breaker. The second circuit breaker, and the horizontal circuit that connects the second circuit breaker and the third circuit breaker are pulled out by cables via a branch line disconnector and a cable head, The gas insulated switchgear characterized in that the cable head is arranged on the main bus bar side close to the horizontal electric circuit . Between the first and second main buses arranged in parallel, first, second and third circuit breakers each having a disconnector on both sides are electrically connected in series, and the first circuit breaker In the gas insulated switchgear from which the branch line which sends and receives electric power from between the 2nd circuit breaker and the 2nd circuit breaker and the 3rd circuit breaker was derived,
The three circuit breakers are arranged side by side in the longitudinal direction of the two main buses with the axis thereof in a direction perpendicular to the longitudinal direction of the two main buses, and the branch line is connected to the first circuit breaker. The second circuit breaker, and the horizontal circuit that connects the second circuit breaker and the third circuit breaker are pulled out by cables via a branch line disconnector and a cable head, The gas-insulated switchgear characterized in that the cable head is disposed on the opposite side of the main bus side close to the horizontal electric circuit.

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