JP3887866B2 - Cubicle type gas insulated switchgear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cubicle type gas insulated switchgear and is intended to be reduced in size.
[0002]
[Prior art]
There are two types of 66/77 KV gas insulated switchgear (hereinafter simply referred to as GIS): a pipe-type GIS mainly used by electric power companies and a cubicle-type GIS (hereinafter simply referred to as C-GIS) mainly used by the private sector. is there. The latter C-GIS has a row type and a unit (box) type depending on the form of the product.
[0003]
As types of GIS, there are those shown in Conventional Examples 1 to 4.
[0004]
A new package type GIS according to Conventional Example 1 is shown in FIG. 12A and 12B show the power receiving unit, FIGS. 12C and 12D show the primary part of the transformer, and FIGS. 12E and 12F show the PCT unit. In FIG. 12, 1 is a pipe line part made of a pipe line, 2 is an operation part for operating the GCB and the like, and 3 is a surface panel. In the figure, BUS is a bus, ES is a grounding switch, LA is a lightning arrester, GCB is a gas circuit breaker, EDS is a disconnector with a grounding switch, PCT is a current transformer for a trading instrument, and TR is a transformer.
[0005]
Next, a row-type GIS according to Conventional Example 2 is shown in FIGS. 13 (a), (b), and (c). As shown in FIG. 13A, the power receiving units 4 and 5 and the PCT unit 6 are arranged. The power receiving units 4 and 5 shown in FIG. 13B and the PCT unit 6 shown in FIG. 7 and 8 are housed with equipment and filled with an insulating gas, and partition plates 9 and 10 are provided. Each unit is connected via a power cable. In the figure, DS is a disconnector, VCB is a vacuum circuit breaker, BCT is a feedthrough current transformer, VD is a voltage detector, CHD is a cable head, and CT is a current transformer.
[0006]
Next, FIG. 14 (a) and 14 (b) show a row-type GIS according to Conventional Example 3. FIG. FIG. 14A shows a power receiving board, and FIG. 14B shows a transformer primary board. As shown in the figure, the devices are accommodated in arc-shaped rectangular containers 11 to 14 which are pressure containers, and these are covered by the decorative outer walls 15 and 16 to form a double structure.
[0007]
Finally, a phase-separated GIS according to Conventional Example 4 is shown in FIG. In this case, the operation box 17 of the circuit breaker is used as a surface plate, and an insulating bus bar is formed for each phase.
[0008]
[Problems to be solved by the invention]
However, in the GIS according to Conventional Example 2, each unit is connected by a power cable, so that terminal processing of the power cable is necessary and the cost increases. Moreover, it is inferior to long-term reliability. The GIS according to Conventional Example 3 has a double structure in which the outer side of the pressure vessel is covered with a decorative outer wall, which increases the cost. In addition, as a matter common to the GIS according to the conventional examples 2 and 3, since both surfaces of the insulating spacer are set parallel to the horizontal plane, foreign matter is likely to adhere to the outer surface of the insulating spacer and easily cause dielectric breakdown. In Conventional Example 3, since the insulating spacer is disposed at the position affected by the metallic fine powder accompanying the opening / closing of the disconnector, the countermeasure for improving the reliability is reversed. Furthermore, regarding the GIS according to the conventional examples 2 and 3, the technical capability of collectively storing devices such as disconnectors and circuit breakers in a pressure vessel is excellent, but if an accident such as a ground fault occurs, the stored devices Will all be affected and will take a long time to recover. In addition, it is possible to easily perform gas classification, which is impossible with a conventional small cubicle type gas insulated switchgear.
[0009]
Therefore, an object of the present invention is to provide a cubicle type gas insulated switchgear that solves such a problem.
[0010]
[Means for Solving the Problems]
The present invention provides a cubicle type gas insulated switchgear in which a main circuit conductor that penetrates a partition wall through an insulating spacer is provided inside a housing, and a disconnector is provided in the main circuit conductor.
As the insulating spacer, an insulating tube having a substantially bottomed cylindrical shape that airtightly penetrates the partition wall is provided, and a fixed-side conductor that airtightly penetrates the bottom of the insulating tube is provided, while a movable-side conductor is provided on the opening side of the insulating tube. A movable rod slidable with respect to the movable-side conductor is provided so as to be able to contact with and separate from the fixed-side conductor, and the movable rod is linked to driving means to constitute the disconnector, and is connected to the disconnector the terminals of the circuit breaker viewed write set in the circuit breaker and the circuit breaker chamber by integrating the disconnecting switch as the movable side conductor and filled with an insulating gas in the circuit breaker compartment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[0012]
(A) Example 1
A cubicle type gas insulated switchgear according to a first embodiment of the present invention is shown in FIGS. FIG. 1 is a single line connection diagram of a cubicle type gas insulated switchgear, FIG. 5 (a) is a front view of the cubicle type gas insulated switchgear, and FIG. 5 (b) is a right side view. As shown in FIG. 5, a power receiving unit 21 and a transformer primary unit 22 are arranged on the left and right with the PCT unit 20 as the center, and a bus bar connecting unit 23 is further provided on the right side.
[0013]
First, the structure of the power receiving unit 21 is shown in FIG. The interior of the housing 19 is partitioned by partition walls 27, 28, 29, and 30 to form a busbar chamber 24, a drawing chamber 25, and a circuit breaker chamber 26, and these three spaces are filled with an insulating gas. A cable head CHD for receiving power as a cubicle-type gas insulated switchgear is provided on the left side of the drawing chamber 25, while a bus BUS is provided in the bus chamber 24, and a vacuum bus breaker VCB or the like is provided between the two. It is connected.
[0014]
Here, the disconnector DS provided below the vacuum circuit breaker VCB is configured as follows. A bottomed cylindrical insulating cylinder 33 that also serves as an insulating spacer is provided in a state of airtightly penetrating the partition wall 30, and a fixed-side conductor 34 that airtightly penetrates the bottom of the insulating cylinder 33 is provided. The fixed side conductor 34 is connected to the cable head CHD, while the movable bar 36 is slidably inserted into the movable side terminal 35 of the vacuum circuit breaker VCB that also serves as the movable side conductor, and the left end of the movable bar 36 is the fixed side conductor. 34 is detachably provided. Similarly, an insulating cylinder 37, a fixed-side conductor 38, a fixed-side terminal 39, and a movable rod 40 are provided on the upper side of the vacuum circuit breaker VCB to constitute a disconnector DS.
[0015]
In addition, the grounding switch ES for grounding by projecting the grounding rods 41 and 42 to the left in FIG. 8 and bringing them into contact with the fixed side terminal 39 and the movable side terminal 35 is the vacuum circuit breaker VCB. It is provided above and below the right side.
[0016]
An operation unit 43 is provided on the right side of the vacuum circuit breaker VCB. The operation unit 43 includes a driving unit that drives the vacuum circuit breaker VCB, a driving unit that drives the movable rods 40 and 36 in the upper and lower disconnectors DS, Drive means for driving the grounding rods 41 and 42 in the grounding switch ES.
[0017]
A front panel 32 is provided on the front surface of the housing, and a back panel 31 is provided on the back surface. A transformer TR is passed between the partition wall 28 and the back panel 31 after flowing through a transformer current transformer PCT for transaction instruments. A load bus BUS that forms a flow path of a current that flows toward is accommodated.
[0018]
Next, the structure of the transformer primary unit 22 will be described with reference to FIG. Similar to the power receiving unit 21, the inside of the housing 19 is vertically divided by a partition wall 27 that is long in the horizontal direction, and the power receiving unit is below the partition wall 27 except that the grounding switch ES and the lightning arrester LA in the lead-in chamber 25 are removed. The configuration is the same as 21. On the other hand, a partition 28 is disposed on the front side above the partition 27, and a bus BUS is disposed in the bus chamber 24 on the rear side. Above the busbar chamber 24, a grounding voltage current transformer GPT filled with an insulating gas is provided and connected to the fixed conductor 38 in the busbar chamber 24. In addition, when using the grounding voltage current transformer GPT of a plastic film insulation, since it is small, it can be arranged above the partition wall 27 in the housing 19. Further, when the grounding voltage current transformer GPT is applied to an unnecessary circuit, this is removed so that nothing is placed on the housing 19. The connection with the transformer TR is made through a cable connected to the cable head CHD. However, when the connection is made directly through the insulated bus, the partition wall 29 and the cable head CHD are removed, and the conduit for the insulated bus is connected to the rear panel 31. Install.
[0019]
Next, the structure of the PCT unit 20 will be described with reference to FIG. As shown in the figure, bus bars 46 are formed on the left and right of the upper portion of the housing 19 by the partition walls 44 and 45, and the bus bar BUS is accommodated. On the other hand, a transformer for current transformer PCT for transaction instruments is accommodated below the partition wall 44, and the transformer for current transformer PCT for transaction instruments is individually connected to the left and right buses BUS via the disconnect switch DS and the ground switch ES. Has been. As the disconnector DS, a switch using an insulating cylinder that also serves as an insulating spacer is used. As the ground switch ES, one having a grounding rod 47 that comes into contact with the movable conductor 18 from above is used. An operation unit 49 is provided on the housing 19 for moving the movable rod 40 of the disconnector DS in the horizontal direction via the lever 48 and moving the grounding rod 47 up and down. In addition, what is necessary is just to change an insulation cylinder to the conventional insulation spacer, when the disconnecting switch DS and the earthing switch ES are not required.
[0020]
Next, the busbar connection unit 23 will be described with reference to FIG. As shown in FIG. 11A, the casing 19 is vertically partitioned by the partition 51, and the upper space is partitioned left and right by the partition 50. In the upper left and right spaces in FIG. 11A, three-phase main circuit conductors 52 and 53 are provided in a direction perpendicular to the paper surface, respectively, and a pair of disconnections are provided between the main circuit conductors 52 and 53. A device DS and a single ground switch ES are provided. As shown in FIG. 11A, a pair of disconnecting devices DS having an insulating cylinder also serving as an insulating spacer is attached to the mounting wall 54 in the same manner as described above, and the fixed-side conductor 38 is individually connected to the main circuit conductors 53 and 52. Has been. On the other hand, the movable side conductors 18 are connected to each other through a connection conductor 55. Operation units 56 and 57 for operating the upper and lower DSs are provided, and the operation units 56 and 57 are connected to the movable rod 40 via levers 58 and 59, respectively. A grounding rod 60 that contacts and separates from the movable conductor 18 only in conjunction with the operation unit 56 is linked and constitutes a grounding switch ES.
[0021]
In the bus bar connecting unit 23 shown in FIG. 11, it is connected to the grounding transformer current transformer GPT attached to the inside of the transformer primary unit 22 shown in FIG. 1 or the position Q in FIG. The grounding voltage current transformer GPT can be accommodated in the lower part of the housing 19 as indicated by a virtual line in FIG. Note that the bus-bar connecting unit 23 is not used in a cubicle type gas insulated switchgear in which a disconnector or a ground switch is not provided at a position indicated by 23 in FIG.
[0022]
Finally, the PCT bypass circuit 61 of FIG. 1 will be described. In this PCT bypass circuit 61, a disconnector DS and a grounding switch ES similar to those attached to the attachment wall 54 in FIG. 11A are attached to the partition wall 28 in FIG. 8, and at a position sandwiching the partition wall 28 in FIG. The arranged buses BUS are connected to each other through a disconnect switch DS and a ground switch ES, but are not shown.
[0023]
Next, the operation of the cubicle type gas insulated switchgear will be described. In the power receiving unit 21 and the transformer primary unit 22 shown in FIGS. 8 and 9, the vacuum circuit breaker VCB, the disconnect switch DS, the ground switch ES, and the operation unit 43 in the circuit breaker chamber 26 are integrally formed to form the DS · It is a breaker with ES. Therefore, the circuit breaker chamber 26 can be filled with an insulating gas in advance, and the gas classification required for the cubicle type gas insulated switchgear is easy, so that the JEMA standard C type (cubic type) and M type ( (Metal clad type) gas insulated switchgear. In addition, in the conventional cubicle type gas insulated switchgear, an insulating spacer is attached to the partition wall, while a separately attached disconnector and breaker are connected. In the present invention, the insulating spacer and disconnector are integrated. Has been miniaturized. Furthermore, the disconnector is configured by providing a movable rod that connects / disconnects between the fixed-side conductor that penetrates the insulating cylinder that also serves as an insulating spacer and the terminal of the vacuum circuit breaker. There is no need to provide this, leading to a reduction in the number of parts, cost reduction, and space saving.
[0024]
In addition, as shown in FIGS. 8 and 9, the bus BUS is arranged with the power bus on the front panel 32 side and the load bus on the back panel 31 side by side in the vertical direction. Can be used effectively. That is, the connection operation of the main circuit conductor is facilitated, and at the same time, the grounding current transformer GPT and the like can be attached.
[0025]
In the transformer primary unit 22, since the grounding transformer current transformer GPT is provided on the housing 19 as shown in FIG. 9, it is not necessary to provide a separate GPT unit. Further, when checking the vacuum circuit breaker VCB, the lower left disconnector DS can be opened to separate the vacuum circuit breaker VCB from the transformer TR.
[0026]
(B) Examples 2, 3, and 4
A single wire connection diagram of the cubicle type gas insulated switchgear according to the second embodiment is shown in FIG. 2, and an external view is shown in FIG. A single line connection diagram of the cubicle type gas insulated switchgear of Example 3 is shown in FIG. 3, and an external view is shown in FIG. And the single wire connection diagram of the cubicle type gas insulated switchgear of Example 4 is shown in FIG. Here, the positions of the power receiving unit 21 and the transformer primary unit 22 may be interchanged.
[0027]
The second to fourth embodiments can be configured by arranging and connecting the devices in each unit in the first embodiment.
[0028]
【The invention's effect】
As understood from the above description, for integrating the insulation spacer and disconnector allows reduction of the cubicle-type gas insulated switchgear as well as reduce the cost by reducing the number of parts.
[0029]
Further, the terminals of the breakers have use as a movable side conductor, so filled with insulating gas incorporated into the circuit breaker compartment by integrating the circuit breaker and the disconnector, not possible with small cubicle-type gas insulated switchgear This makes it easier to classify the gas, and the C-shaped cubicle can be changed to an M-shaped cubicle with a partition added.
[Brief description of the drawings]
FIG. 1 is a single-line diagram showing a first embodiment of a cubicle type gas insulated switchgear according to the present invention.
FIG. 2 is a single-line diagram showing a second embodiment of the cubicle-type gas insulated switchgear according to the present invention.
FIG. 3 is a single-line diagram showing a third embodiment of the cubicle-type gas insulated switchgear according to the present invention.
FIG. 4 is a single line connection diagram showing a fourth embodiment of a cubicle type gas insulated switchgear according to the present invention.
FIGS. 5A and 5B relate to the first embodiment of the cubicle type gas insulated switchgear according to the present invention, in which FIG. 5A is a front view and FIG. 5B is a right side view;
6A and 6B relate to a second embodiment of the cubicle-type gas insulated switchgear according to the present invention, in which FIG. 6A is a front view, and FIG. 6B is a right side view.
7A and 7B relate to a cubicle type gas insulated switchgear according to a third embodiment of the present invention, in which FIG. 7A is a front view, and FIG. 7B is a right side view.
FIG. 8 is a configuration diagram of a power receiving unit according to the first embodiment of the cubicle type gas insulated switchgear according to the present invention.
FIG. 9 is a configuration diagram of a transformer primary unit according to the first embodiment of the cubicle-type gas insulated switchgear according to the present invention.
FIG. 10 is a configuration diagram of a PCT unit according to the first embodiment of the cubicle-type gas insulated switchgear according to the present invention.
FIGS. 11A and 11B relate to the bus bar connection unit in the cubicle type gas insulated switchgear according to the first embodiment of the present invention, in which FIG. 11A is a front view showing the left half, and FIG. 11B is a left side view of FIG.
12A and 12B are related to GIS according to Conventional Example 1, FIG. 12A is a side view of a power receiving unit, FIG. 12B is a front view of the power receiving unit, FIG. 12C is a side view of a primary part of a transformer, and FIG. The front view of a primary part, (e) is a side view of a PCT part, (f) is a front view of a PCT part.
13A and 13B relate to a GIS according to Conventional Example 2, wherein FIG. 13A is an external perspective view, FIG. 13B is a configuration diagram of a power receiving unit, and FIG. 13C is a configuration diagram of a PCT unit.
14A and 14B are related to GIS according to Conventional Example 3, wherein FIG. 14A is a configuration diagram of a power receiving panel, and FIG. 14B is a configuration diagram of a transformer primary panel.
15 is a perspective view of a GIS according to Conventional Example 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 18 ... Movable side conductor 19 ... Housings 27, 30, 45 ... Bulkheads 33, 37 ... Insulating cylinders 34, 38 ... Fixed side conductor 35 ... Movable side terminals 36, 40 ... Movable rod 39 ... Fixed side terminals 43, 49, 56, 57 ... Operation part 54 ... Mounting wall DS ... Disconnector VCB ... Vacuum circuit breaker

Claims (1)

In the cubicle type gas insulated switchgear in which a main circuit conductor that penetrates the partition wall is provided inside the housing via an insulating spacer, and a disconnector is provided in the main circuit conductor.
As the insulating spacer, an insulating tube having a substantially bottomed cylindrical shape that airtightly penetrates the partition wall is provided, and a fixed-side conductor that airtightly penetrates the bottom of the insulating tube is provided. The movable bar is slidable with respect to the movable side conductor, and the movable bar is connected to and separated from the fixed side conductor, and the movable bar is linked to the driving means to constitute the disconnector, and is connected to the disconnector. the terminals of the circuit breaker are integrated the disconnecting switch and the circuit breaker as the movable side conductor viewed write set circuit breaker chamber, cubicle-type gas insulated switchgear, characterized in that filled with insulating gas into the circuit breaker compartment .

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