JP4301790B2 - Transformer and hermetic switchgear using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an instrument transformer and a sealed switchgear using the same.
[0002]
[Prior art]
FIG. 8 is a side view showing an example of the internal configuration of this type of conventional instrument transformer-enclosed sealed switchgear.
[0003]
In FIG. 8, reference numeral 101 denotes a sealed switchgear main body, which is composed of a gas chamber 102 and an aerial part 103.
[0004]
In the gas chamber 102, an instrument transformer 104, an airtightly attached disconnector 105, and an airtightly attached busbar connection bushing 106 are accommodated, and a conductor 107 connects these devices. The SF6 gas 108 which is an insulating gas is sealed and insulated.
[0005]
Figure 9 is a side view showing an internal configuration example of a conventional current transformer housing closed type switch gear meter of this kind.
[0006]
In FIG. 9, reference numeral 109 denotes a sealed switchgear main body, which includes a gas chamber 110 and an air portion 111.
[0007]
In the gas chamber 110, an instrument current transformer 112 and an airtightly connected busbar connection bushing 113 are housed, and these devices are connected by a conductor 114, and an SF6 gas 115 which is an insulating gas is contained. Sealed and insulated.
[0008]
By the way, in a sealed switchgear having a structure in which an instrument transformer such as an instrument transformer or an instrument current transformer as described above is housed, the insulating gas itself is expensive and the airtightness that encloses the insulating gas is included. Not only does it take a lot of time to produce the container, but it also requires skilled skills, resulting in an expensive product.
[0009]
In addition, the use of insulating gas makes the hermetic container compact, which limits the assembly of conductors and the like that connect each device.
[0010]
In addition, from the viewpoint of recent stabilization of power supply and improvement of reliability, the introduction of a cogeneration system with an additional generator circuit is used to measure the synchronization of commercial power and generator circuit power and to protect the circuit. In order to add an instrument transformer to the conventional equipment, it is necessary to add a sealed switchgear for accommodating an instrument transformer as shown in FIG.
[0011]
However, if you do not expect to add an enclosed switchgear that houses this instrument transformer, you will not have an additional space and you will not be able to add a panel. Inspection space and passage space may not be secured.
[0012]
In addition, there are few restrictions on the size of the equipment to be carried into existing equipment, and it is necessary to disassemble and carry in the gas chamber and the aerial part of the instrument transformer enclosed sealed switchgear. As a result, the construction period is longer.
[0013]
[Problems to be solved by the invention]
As described above, in the sealed switchgear as shown in FIGS. 8 and 9 which is reduced in size by enclosing the insulating gas (SF6 gas 108), the insulating gas is expensive and the insulating gas There is a problem in that it is not easy to manufacture an airtight container for enclosing the container.
[0014]
Further, when configuring the main circuit portion of the SF6 gas insulated switchgear, many parts and bolts and nuts are used, so that much time is required for the assembly and inspection.
[0015]
On the other hand, when adding a sealed switchgear that houses a transformer for an instrument, it is not possible to secure an expansion space. There was a problem that not only the time was increased, the operating rate of the equipment decreased, but also the local construction cost increased.
[0016]
In addition, even if the number of rows can be increased, the side inspection space is reduced, the inspection path for turning from the front to the back through the side cannot be taken, and the opposite side must be passed to the back, which is inconvenient for maintenance inspection. There was a problem such as.
[0017]
In addition, there are restrictions on loading, disassembling the sealed switchgear and assembling it locally, so it takes time for local work, lengthening the power outage time, lowering the operating rate of the equipment, and increasing the cost of local work. There were also problems such as.
[0018]
An object of the present invention is to enable a transformer for an instrument with a grounded outer layer to be attached to a sealed switchgear without being housed in a gas chamber and to reduce the number of parts and to be compact, safe and reliable. And a hermetic switchgear using the same.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the transformer of the present invention is provided with a grounded conductive layer on the surface of the transformer molded with an insulator, and substantially parallel to the opposite side of the mounting surface of the transformer. And at least two input terminals that can be connected to the main circuit of the sealed switchgear insulated from the conductive layer.
[0020]
Further, the transformer of the present invention is provided with a grounded conductive layer on the surface of the transformer, and can be connected to the main circuit charging part of the transformer almost perpendicularly to the opposite side of the mounting surface of the transformer, and conductive. A transformer having at least one input terminal insulated from the layer, and a busbar connection unit that can be connected to the input terminal of the transformer and has terminals that can be connected to the main circuit of the sealed switchgear at both ends. It consists of a pair.
[0022]
Therefore, in the transformer of the present invention and the sealed switchgear using the same, the instrument transformer is attached to the sealed switchgear by the input terminal insulated from the conductive layer without being housed in the gas chamber. A compact, highly safe and reliable sealed switchgear can be realized by reducing the number of parts.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0024]
(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration example of an outer-layer grounded instrument transformer according to the present embodiment.
[0025]
In FIG. 1, a grounded conductive layer 2 is provided on the outer layer (surface) of an instrument transformer 1 molded with an epoxy resin that is a solid insulator.
[0026]
Further, it can be connected to the main circuit charging portion 4 of the instrument transformer 1 substantially parallel to the opposite side of the mounting surface 3 of the instrument transformer 1, and is insulated from the outer layer ground by an epoxy resin which is a solid insulator. The configuration has at least two or more input terminals (in this example, two input terminals 5a and 5b).
[0027]
Next, in the outer layer grounded instrument transformer according to the present embodiment configured as described above, a grounded conductive layer 2 is provided on the outer layer of the instrument transformer 1, and the instrument transformer 1 is further attached. Nearly parallel to the opposite side of the surface 3, there are two input terminals 5 a and 5 b that can be connected to the main circuit charging part 4 of the instrument transformer 1 and are insulated from the outer layer ground by an epoxy resin that is a solid insulator. By adopting such a configuration, the external insulation of the instrument transformer 1 can be performed with an epoxy resin, and gas insulation is not necessary, so that it is not necessary to store in the gas chamber.
[0028]
Further, it can be attached to the main circuit of the sealed switchgear using the input terminals 5a and 5b insulated from the outer layer ground by the epoxy resin.
[0029]
As a result, it is possible to realize a compact, safe and reliable outer-grounded instrument transformer with a reduced number of parts.
[0030]
In addition, even if there are small restrictions on the dimensions for carrying in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are not required, shortening the construction period. be able to.
[0031]
As described above, in the present embodiment, as the instrument transformer used for the sealed switchgear, the conductive layer 2 having terminals 5a and 5b connectable to the bus and grounded to the outer layer of the instrument transformer 1 is used. Since the instrument transformer 1 can be mounted on a sealed switchgear without being housed in the gas chamber, the outer layer grounding is compact, safe and reliable with a reduced number of parts. An instrument transformer can be obtained.
[0032]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. It becomes possible.
[0033]
(Second Embodiment)
FIG. 2 is a plan view showing a configuration example of the enclosed switch gears arranged in a row according to the present embodiment, and FIG. 3 is a front view showing a configuration example of the enclosed switch gears arranged in a row according to the present embodiment (FIG. 2). The same elements as those in FIG. 1 are denoted by the same reference numerals.
[0034]
That is, the sealed switchgear according to the present embodiment is, as shown in FIGS. 2 and 3, an outer-layer grounded instrument transformer according to the first embodiment (hereinafter described as instrument transformer 1). Is configured to be connected to the bus bar 7 in accordance with the interphase dimension of the bus bar 7 of the sealed switchgear 6.
[0035]
Further, as shown in FIG. 3, when viewed from the direction of the arrow AA in FIG. 2, the instrument transformer 1 is connected to the bus 7 of the hermetic switchgear 6 together with the height.
[0036]
Next, in the sealed switchgear according to the present embodiment configured as described above, the instrument transformer 1 is mounted in accordance with the interphase dimensions of the bus 7 of the sealed switchgear 6. This makes it possible to easily connect the additional instrument transformer 1 and the sealed switchgear 6 of the existing equipment through the bus 7, thereby reducing the work time and the power outage time. The rate is not drastically reduced, and soaring construction costs can be suppressed.
[0037]
Further, even if the instrument transformer 1 is approached to the end of the side wall 8, the maintenance passage 9 can be secured in the lower portion, so that maintenance and inspection can be easily performed.
[0038]
As described above, in this embodiment, the mounting of the instrument variable pressure device 1, since the way match the phase dimensions of the bus 7 of a closed type switch gear 6, can be easily connected to the existing facilities Therefore, the work time can be shortened and the power failure time can be shortened.
As a result, the operating rate of the facility can be prevented from being extremely lowered, and the local construction cost can be prevented from rising.
[0039]
(Third embodiment)
4 is a side view (an arrow BB in FIG. 2) showing a configuration example of the sealed switchgear according to the present embodiment. The same elements as those in FIGS. Description is omitted, and only different parts are described here.
[0040]
That is, the sealed switchgear according to the present embodiment has a configuration in which the instrument transformer 1 in the second embodiment is disposed on the ceiling portion 10 of the sealed switchgear 6 as shown in FIG. .
[0041]
Next, in the sealed switchgear according to the present embodiment configured as described above, the instrument transformer 1 is arranged on the ceiling portion 10 of the sealed switchgear 6 so that the side expansion space can be obtained. Is eliminated, and a side inspection and an inspection passage can be secured, so that there is no inconvenience in maintenance inspection.
[0042]
As described above, in the present embodiment, the instrument transformer 1 is arranged on the ceiling 10 of the hermetic switchgear 6, so that a side expansion space is not required, and a side inspection or inspection passage is provided. Therefore, it is possible to eliminate inconvenience in maintenance inspection.
[0043]
(Fourth embodiment)
FIG. 5 is a side view showing a configuration example of an outer-layer grounded instrument transformer according to the present embodiment.
[0044]
In FIG. 5, a grounded conductive layer 12 is provided on the outer layer (surface) of an instrument transformer 11 molded with an epoxy resin that is a solid insulator.
[0045]
At least perpendicular to the opposite side of the mounting surface 13 of the instrument transformer 11 and connectable to the main circuit charging portion of the instrument transformer 11 and insulated from the outer layer ground by an epoxy resin that is a solid insulator An instrument transformer 11 having one or more input terminals (in this example, one input terminal 14), a terminal connectable to the input terminal 14 of the instrument transformer 11, and connectable to both ends of the bus It is constituted by a pair with a busbar connection unit 15 having a connection with a flexible rubber 16.
[0046]
Next, in the outer-layer grounded instrument transformer according to the present embodiment configured as described above, a grounded conductive layer 12 is provided on the outer layer of the instrument transformer 11, and the instrument transformer 11 is attached. An instrument transformer having one input terminal 14 that is connectable to the main circuit charging portion of the instrument transformer 11 and is insulated from the outer layer ground by an epoxy resin that is a solid insulator, substantially perpendicularly to the opposite side of the surface 13. The instrument transformer can be connected to the input terminal 14 of the instrument transformer 11 and has a pair of busbar connection units 15 having terminals that can be connected to the busbars at both ends. 11 can be insulated without relying on SF6 gas, so that it is not necessary to house it in the gas chamber, and there is no need to provide an instrumentation transformer enclosed sealed switchgear.
[0047]
Thereby, the number of parts can be reduced and a compact, highly safe and reliable instrument transformer can be realized.
[0048]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. be able to.
[0049]
As described above, in the present embodiment, a conductive layer 12 having a terminal 14 that can be connected to a bus and grounded to the outer layer of the instrument transformer 11 is provided as an instrument transformer used in the sealed switchgear. In addition, since it is configured as a pair with the busbar connection unit 15 having terminals that can be connected to the busbars at both ends, the instrument transformer 11 can be attached to the sealed switchgear without being housed in the gas chamber. By reducing the number of points, it is possible to obtain a compact, safe and reliable outer-grounded instrument transformer.
[0050]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. It becomes possible.
[0051]
(Fifth embodiment)
FIG. 5 is a side view showing a configuration example of the hermetic switchgear according to the present embodiment.
[0052]
That is, the sealed switchgear according to the present embodiment is configured so that, as shown in FIG. 5, the instrument transformer 11 according to the fourth embodiment is arranged in accordance with the interphase dimensions of the busbars of the sealed switchgear 17. It is set as the structure connected to.
[0053]
Next, in the sealed switchgear according to the present embodiment configured as described above, the instrument transformer 11 is mounted in accordance with the interphase dimensions of the busbars of the sealed switchgear 17. When the commercial frequency withstand voltage test voltage at the factory cannot be applied to the instrument transformer 11 and disconnected from the bus, or when the instrument transformer 11 fails and is disconnected from the bus, the instrument transformer 11 In the case of being located in the middle of the sealed switchgear 17, the bus transformer connecting unit 15 is provided between the bus bars at both ends thereof, so that the instrument transformer 11 can be disconnected from the bus bar without connecting or disconnecting the bus bar. The test bus and the test bus connecting unit are not required, and the test time can be shortened.
[0054]
As described above, in this embodiment, unnecessary attachment of instrument variable voltage divider 11, since the way match the phase dimensions of the generatrices of the enclosed switchgear 17, the test bus and the test bus connection unit Thus, the test time can be shortened.
[0055]
(Sixth embodiment)
FIG. 6 is a part of a side view showing a configuration example of the hermetic switchgear according to the present embodiment.
[0056]
In FIG. 6, a grounded conductive layer 12 is provided on the outer layer (surface) of an instrument transformer 11 molded with an epoxy resin that is a solid insulator.
[0057]
At least perpendicular to the opposite side of the mounting surface 13 of the instrument transformer 11 and connectable to the main circuit charging portion of the instrument transformer 11 and insulated from the outer layer ground by an epoxy resin that is a solid insulator Instrument transformer 11 having one or more input terminals (14 input terminals in this example) and hermetic switchgear 18 are hermetically attached, and can be connected to input terminal 14 of instrument transformer 11 In addition, the bus connection unit 19 having a terminal that can be connected to the bus at the tip is configured as a pair and connected by the flexible rubber 16.
[0058]
Next, in the outer-layer grounded instrument transformer according to the present embodiment configured as described above, a grounded conductive layer 12 is provided on the outer layer of the instrument transformer 11, and the instrument transformer 11 is attached. An instrument transformer having one input terminal 14 that is connectable to the main circuit charging portion of the instrument transformer 11 and is insulated from the outer layer ground by an epoxy resin that is a solid insulator, substantially perpendicularly to the opposite side of the surface 13. And a bus connection unit 19 which is airtightly attached to the sealed switchgear 18 and can be connected to the input terminal 14 of the instrument transformer 11 and has a terminal which can be connected to the bus at the tip. As a result, the instrument transformer 11 can be attached to the sealed switchgear 18 without being housed in the gas chamber, so the number of parts is reduced, and it is compact, safe and reliable. It is possible to realize a layer voltage transformer with ground.
[0059]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. be able to.
[0060]
As described above, in the present embodiment, a conductive layer 12 having a terminal 14 that can be connected to a bus and grounded to the outer layer of the instrument transformer 11 is provided as an instrument transformer used in the sealed switchgear. and since so as to constitute in pairs with busbar connection unit 19 having a bus connectable terminals earlier end, for attachment to instrument transformer 11 to a closed type switch gear without accommodating the gas chamber, By reducing the number of parts, it is possible to obtain a compact, safe and reliable outer-layer grounded instrument transformer.
[0061]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. It becomes possible.
[0062]
(Seventh embodiment)
FIG. 7 is a side view showing an example of the configuration of an outer-layer grounded instrument current transformer according to the present embodiment.
[0063]
In FIG. 7, a grounded conductive layer 21 is provided on the outer layer (surface) of a current transformer 20 that is molded with an epoxy resin that is a solid insulator.
[0064]
Moreover, it can be connected to the main circuit charging portions 23a and 23b of the current transformer 20 and is substantially parallel to the opposite side of the mounting surface 22 of the current transformer 20 and is grounded by an epoxy resin which is a solid insulator. And at least two or more input terminals (in this example, two input terminals 24a and 24b) insulated from each other.
[0065]
Next, in the current transformer for instrumentation with an outer layer ground according to the present embodiment configured as described above, a grounded conductive layer 21 is provided on the outer layer of the instrument current transformer 20, and the instrument current transformer is further provided. Two inputs that can be connected to the main circuit charging portions 23a and 23b of the current transformer 20 and that are insulated from the outer layer ground by an epoxy resin that is a solid insulator, substantially parallel to the opposite side of the mounting surface 22 of the 20 By adopting a configuration having the terminals 24a and 24b, external insulation of the current transformer 20 can be performed with an epoxy resin, and gas insulation is not required, so there is no need to store in the gas chamber. .
[0066]
Further, by using the input terminal 24 a and 24 b which are insulated from the outer layer grounded by epoxy resin, it can be attached to the main circuit of the closed type switch gear.
[0067]
As a result, it is possible to realize a compact, safe and reliable outer-grounded instrument transformer with a reduced number of parts.
[0068]
In addition, even if there are small restrictions on the dimensions for carrying in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are not required, shortening the construction period. be able to.
[0069]
As described above, in the present embodiment, the current transformer for the instrument used for the sealed switchgear has the terminals 24a and 24b that can be connected to the bus and is electrically connected to the outer layer of the instrument current transformer 20. Since the layer 21 is provided, the current transformer 20 for instrumentation can be attached to the sealed switchgear without being housed in the gas chamber, so the number of parts is reduced, and it is compact, safe and reliable. It becomes possible to obtain a high current transformer for grounded instrument.
[0070]
In addition, even if there are small restrictions on import dimensions when bringing in existing equipment, it is possible to carry in if there are dimensions that allow workers to pass through, so dismantling at the time of shipment and on-site reassembly are unnecessary, shortening the construction period. It becomes possible.
[0071]
(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation.
For example, in the seventh embodiment, the case has been described in which the instrument transformer in the first embodiment is configured as an instrument current transformer. The instrument transformer in the sixth to sixth embodiments can be configured as an instrument current transformer.
[0072]
Even in such a configuration, it is possible to achieve the same effects as those described in the second to sixth embodiments.
[0073]
Further, the above embodiments may be appropriately combined as much as possible, and in that case, combined effects can be obtained.
Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent requirements.
For example, even if some constituent elements are deleted from all the constituent elements shown in the above embodiments, the problem (at least one) described in the column of problems to be solved by the invention can be solved. When (at least one of) the effects described in the “Effect” column can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.
[0074]
【The invention's effect】
As described above, according to the instrument transformer for outer-layer grounding and the sealed switchgear using the same according to the present invention, the transformer is sealed by the input terminal insulated from the conductive layer without being housed in the gas chamber. Since it is attached to the switch gear, it is possible to reduce the number of parts, to be compact and to increase safety and reliability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration example of an outer-layer grounded instrument transformer according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a configuration example of an enclosed switch gear arranged in a line according to a second embodiment of the present invention.
FIG. 3 is a front view (arrow AA) showing a configuration example of an enclosed switch gear arranged in line according to a second embodiment of the present invention.
FIG. 4 is a side view showing a configuration example of a sealed switchgear according to a third embodiment of the present invention (indicated by arrows BB in FIG. 2).
FIG. 5 is a side view showing a configuration example of an outer-layer grounded instrument transformer and a sealed switchgear according to fourth and fifth embodiments of the present invention.
FIG. 6 is a part of a side view showing a configuration example of a sealed switchgear according to a sixth embodiment of the present invention.
FIG. 7 is a side view showing a configuration example of a current transformer for an outer layer grounded instrument according to a seventh embodiment of the present invention.
FIG. 8 is a side view showing an example of the internal configuration of a conventional instrument transformer-enclosed sealed switchgear.
Figure 9 is a side view showing an internal configuration example of a conventional current transformer housing closed type switch gear meter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11,104 ... Instrument transformer 2,12,21 ... Grounded conductive layer 3,13,22 ... Mounting surface 4,23a, 23b ... Main circuit charging part 5a, 5b , 14,24a, 24b ... Input Terminals 6, 17, 18 ... Sealed switchgear 7 ... Busbar 10 ... Ceiling part 15, 19 ... Busbar connection unit 16 ... Flexible rubber 20, 112 ... Current transformer 101, 109 ... Sealed switchgear body 102, 110 ... Gas chamber 103, 111 ... Air part 105 ... Disconnector 106, 113 ... Bus connection bushing 107, 114 ... Conductor 108, 115 ... SF6 gas.

Claims (5)

Provide a grounded conductive layer on the surface of the transformer molded with an insulator,
Two or more connectable to the main circuit charging part of the transformer and parallel to at least the main circuit of the sealed switchgear insulated from the conductive layer, substantially parallel to the opposite side of the mounting surface of the transformer A transformer having an input terminal. A grounded conductive layer is provided on the surface of the transformer, and is at least perpendicular to the opposite side of the mounting surface of the transformer and is connectable to the main circuit charging portion of the transformer and is insulated from the conductive layer. A transformer having one or more input terminals;
Transformer, characterized in that is constituted by the transformer can be connected to the input terminal, and a pair of the bus connecting unit having a connectable terminal and the main circuit of the closed type switch gear at both ends. A sealed switchgear, wherein the transformer according to claim 1 or 2 is connected to the busbar in accordance with the inter-phase dimension of the busbar of the sealed switchgear body. The transformer according to claim 1 or 2, wherein
  A transformer, wherein the transformer is an instrument transformer or an instrument current transformer. The hermetic switchgear according to claim 3, wherein
  A sealed switchgear characterized in that the transformer is an instrument transformer or an instrument current transformer.

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