JP6621299B2 - Switchgear - Google Patents

Description

  The present invention relates to a switchgear, and in particular, an instrument transformer and a lightning arrester are efficiently arranged on a carriage.

In switchgear used by consumers to receive power from electric utilities, the voltage transformer is used to measure the voltage at the power receiving point in the power receiving unit, and the voltage rise is suppressed when a surge voltage is applied to the power receiving point. A lightning arrester may be installed. In order to facilitate maintenance of the instrument transformer and the lightning arrester, these devices are housed in a drawer-type housing and housed as a drawer-type device. For example, such a configuration is disclosed in FIG.
Also, it is disclosed in FIG. 5 of Patent Document 2 that such an instrument transformer and a lightning arrester are mounted on one carriage.

Japanese Patent No. 3279711 JP 2003-189426 A

The technique disclosed in Patent Document 1 is a drawer-type device, so that maintenance is easy to some extent, but there is a problem in that it cannot cope with rearrangement involving a large change.
Moreover, in the thing of the patent document 2, since the instrument transformer used as a heavy article was attached to the upper part of the drawer trolley, the center of gravity became the trolley upper part, and there existed a problem that a trolley became easy to fall.

  In general, it is known that when the discharge current required for the lightning arrester increases, the outer shape of the lightning arrester increases. When the lightning arrester is placed on the bottom of the carriage as in Patent Document 2, the center of gravity of the carriage further rises due to the position of the instrument transformer moving further above the carriage when the outer shape of the arrester increases. It becomes easy to do. In order to cope with the increase in the size of the lightning arrester, there has been a problem that the shape of the carriage has to be changed.

The switchgear according to the present invention is a switchgear in which an instrument transformer and a lightning arrester are arranged in the same drawer-type carriage, and a high voltage connected to the instrument transformer and the arrester in the middle stage of the carriage as viewed from the side. The instrument transformer is disposed below the high voltage unit, and the high voltage side connected to the high voltage unit is arranged below the high voltage unit in a vertical direction above the high voltage unit. The lightning arrester is arranged.

  According to the present invention, the lightning arrester is arranged with the high voltage side facing downward, and the high voltage part connected to the high voltage side terminal of the instrument transformer and the lightning arrester is concentrated at the center in the height direction of the carriage, so that the insulation distance Securement becomes easy and the effect of space saving increases. In addition, by arranging an instrument transformer, which is generally heavier than a lightning arrester, on the bottom side of the carriage, the overall center of gravity is lowered, and the handling when moving the carriage is improved. Even if it is combined with a lightning arrester into a common carriage, the handling of the carriage will not be impaired.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the drawer type trolley | bogie which mounts the instrument transformer and lightning arrester by Embodiment 1 which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view of a drawer type carriage equipped with an instrument transformer and a lightning arrester according to Embodiment 1 of the present invention. The perspective view of the drawer | drawing-out type trolley | bogie which mounts the instrument transformer and lightning arrester by Embodiment 2 which concerns on this invention. Side surface sectional drawing of the drawer | drawing-out type trolley | bogie which mounts the instrument transformer and lightning arrester by Embodiment 2 which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS The front view of the switchgear which shows the whole structure in Embodiment 1 which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a switchgear showing an overall configuration according to Embodiment 1 of the present invention.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 5 and 6. FIG. FIG. 1 is a perspective view of a drawer-type carriage equipped with an instrument transformer and a lightning arrester according to Embodiment 1, and FIG. 2 is a side cross-sectional view of a drawer-type carriage equipped with an instrument transformer and a lightning arrester according to Embodiment 1. 5 is a front view of the switchgear showing the overall configuration in the first embodiment, and FIG. 6 is a side sectional view of the switchgear showing the overall configuration in the first embodiment.

5 and 6 are a front view and a side sectional view, respectively, of the switchgear according to the first embodiment.
A branch bus 3 branches from the common bus 2 of the switch gear and is connected to a first conductor 4 for fitting with a terminal of a circuit breaker 5 supported by an insulating support 12. The circuit breaker 5 is fitted to the first conductor 4 and the second conductor 7 on the switch gear side at the operating position. A third conductor 8 is assembled to the second conductor 7, and a high voltage cable 9 is attached to the third conductor 8.
The third conductor 8 is branched to the instrument transformer 10 and the lightning arrester 11, and the terminal 13 of the drawer-type carriage 6 on which the instrument transformer 10 and the arrester 11 supported by the insulation support 12 are mounted. It is linked to.

As shown in FIGS. 1 and 2, the drawer-type cart 6 equipped with the instrument transformer 10 and the lightning arrester 11 according to the first embodiment is substantially L-shaped with a bottom surface and a back surface. A terminal conductor 13 </ b> A that is integrally formed with the terminal 13 and serves as a high voltage portion is supported by the insulating support 12.
In the first embodiment, the terminal conductor 13A, which is connected to the terminal 13 and serves as a high voltage portion, is arranged so as to be at the center position of the carriage as viewed from the side. The instrument transformer 10 and the lightning arrester 11 are arranged so that the space from the high voltage to the ground can be used effectively.
The instrument transformer 10 is arranged below the terminal 13 so that the terminal 13 side is at a high voltage, and is electrically connected from the terminal 13 to the primary fuse 19 of the instrument transformer 10 via the cable 14. . The fuse 19 is arranged so that a cylindrical fuse faces in the depth direction so that it can be easily replaced.

By attaching the instrument transformer 10 which is a heavy object to the floor surface portion 6A of the carriage 6, the center of gravity of the entire carriage is positioned below, and the handleability when moving the carriage 6 alone is improved. Moreover, the accessibility to the primary side fuse 19 of the instrument transformer 10 is also improved.
In the first embodiment, the lightning arrester 11 is fixed to the wall side (rear surface) of the carriage 6 while being attached to the back plate 6B of the L-shaped carriage 6. The lightning arrester 11 is located above the terminal 13 on the terminal 13 side. Are arranged to be high voltage. The lightning arrester 11 is arranged with the high voltage part on the lower side, the grounding part on the upper side and the normal arrangement upside down, and is electrically connected from the terminal 13 to the high voltage side of the lightning arrester 11 via the cable 15. The grounding side of the lightning arrester 11 shorts the grounding part of the three-phase lightning arrester 11 with a conductor 16.

The conductor 16 is connected to a lightning arrester grounding terminal 18 via a cable 17.
Here, for convenience, the terminal 13 is connected to the instrument transformer 10 and the lightning arrester 11 via the cable 14 and the cable 15, but may be connected via a conductor instead of the cable. Similarly, the cable 17 connecting the grounding portion of the lightning arrester 11 may be changed to a conductor.

The high voltage side of the instrument transformer 10 and the lightning arrester 11 is connected to the terminal 13 respectively, and when no voltage is applied to the instrument transformer 10 during the withstand voltage test, the cable 14 is removed and the instrument A spatial distance that can ensure the dielectric strength to the transformer 10 and the fuse 19 is secured. Similarly, when a voltage is not applied to the lightning arrester 11 during the withstand voltage test, the distance from the terminal 13 to the lightning arrester 11 can be ensured as long as the cable 15 is removed.
Further, the terminal 13 and the cable 15 are arranged at a certain distance from the lightning arrester body so that the electric field generated by the terminal 13 and the cable 15 does not affect the discharge performance of the lightning arrester 11.
If the insulating support 12 is shared with the switchgear-side conductor fixing member, the cart can be manufactured at low cost.
In addition, the terminal 13 provided in each phase of the three-phase configuration is supported by the three-phase integrally with the insulator, so that the support can be performed firmly and the effect of space saving can be ensured.

In general, when a steep surge current i flows through the grounding wire of the lightning arrester, a potential rise (L × di / dt) due to the inductance L of the grounding wire of the lightning arrester occurs, which hinders the surge voltage suppression effect of the lightning arrester. It is recommended to reduce the inductance L by making the grounding wire of the lightning arrestor as thick and short as possible.
In the first embodiment, the conductor 16 having a predetermined width is used to short-circuit the grounding portions for three phases in the lightning arrester 11, thereby reducing the inductance L of the lightning arrester grounding portion, and the conductor 16 that can be expected to be rigid. By connecting the three-phase lightning arresters 11 at once, vibration suppression of the lightning arresters is achieved.
The cable 17 can be easily changed to a thick cable or conductor having a lower inductance L depending on the surge voltage assumed for the power receiving equipment and the specifications of the lightning arrester. Similarly, the lightning arrester grounding terminal 18 can be easily changed to a terminal having a lower inductance L.

In the first embodiment, an instrument transformer 10 and a lightning arrester 11 connected to a bus consisting of a main bus 2 and a branch bus via a high voltage terminal 13 via a circuit breaker 5 are connected to the same drawer-type cart 6. The instrument transformer 10 is connected to the bus line via a high voltage portion comprising a high voltage side terminal conductor 13A and a cable 14 connected to a high voltage side terminal 13 provided on the drawer type carriage 6, and In the switchgear that connects the lightning arrester 11 to the bus line via the high voltage portion, the high voltage portion is provided in the middle stage of the carriage 6 that is the upper and lower central portion when viewed from the side, and the instrument is provided below the high voltage portion. The transformer 10 is disposed, and the lightning arrester 11 is disposed above the high voltage portion.
Thus, the lightning arrester 11 is arranged with the high voltage side facing downward, and the high voltage portion connected to the high voltage side terminal 13 connected to the instrument transformer 10 and the lightning arrester 11 is concentrated in the central portion in the height direction of the carriage. As a result, it is easy to secure the insulation distance, and the effect of space saving is enhanced.
Further, generally, the instrument transformer 10 is heavier than the lightning arrester 11, and the heavier instrument transformer 10 is placed on the bottom surface 6A of the carriage 6 and arranged on the bottom surface side of the carriage 6, so that the overall center of gravity is obtained. Becomes lower, and the handleability when moving the carriage 6 is improved. Even if the lightning arrester 11 is integrated into the common carriage 6, the handling ability of the carriage 6 is not impaired.

Further, in the first embodiment, in the configuration of the preceding paragraph, the high voltage side of the lightning arrester 11 is connected to the high voltage part, and the ground side of the lightning arrester 11 is connected to the grounding part conductor 16, 11, the high voltage portion is disposed on the lower side, and the ground conductor 16 is disposed on the upper side of the lightning arrester 11.
Thereby, in addition to the effect of a preceding clause, the arrangement configuration of the said high voltage part connected to the lightning arrester 11 and the grounding part conductor 16 can be performed appropriately.

Further, in the first embodiment, the instrument transformer 10 is configured to be mounted on the floor surface portion 6A of the carriage 6 in any one of the configurations in the preceding two items.
Thereby, in addition to the effect of previous 2 term, the handleability at the time of moving the trolley | bogie 6 can further be improved.

In the first embodiment, the lightning arrester 11 is fixed to the back plate 6B or the ceiling (not shown) on the wall side of the carriage 6 in any one of the configurations of the preceding three items.
Thereby, in addition to the effect of previous 3 term | items, arrangement | positioning of the lightning arrester 11 can be selected appropriately.

Further, in the first embodiment, in any one of the configurations of the preceding four items, the bus 6 is fitted to the bus-side terminal including the main bus 2 and the branch bus provided by moving the cart 6 to the operating position. And the high voltage terminal 13 provided in each phase for connecting the said instrument transformer 10 and the said lightning arrester 11 with the said bus | bath was comprised so that three phases might be integrally supported by the insulator.
Thereby, in addition to the effects of the previous four items, each terminal 13 can be firmly supported, and the effect of space saving can be ensured.

Further, in the first embodiment, in any one of the configurations of the preceding five paragraphs, the grounding side of the lightning arrester 11 seems to be connected together by a rigid conductor having three-phase terminals having a predetermined width. Configured.
Thereby, in addition to the effects of the previous five items, it is possible to reduce the inductance of the lightning arrester grounding part and to suppress the vibration of the lightning arrester during transportation.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a perspective view of a drawer type carriage equipped with an instrument transformer and a lightning arrester according to Embodiment 2 of the present invention, and FIG. 4 shows an instrument transformer and an arrester according to Embodiment 2 of the present invention. It is side surface sectional drawing of the drawer type trolley | bogie mounted.

FIG. 3 and FIG. 4 show a drawer type carriage equipped with an instrument transformer and a lightning arrester according to Embodiment 2 of the present invention.
In the second embodiment, the instrument transformer is changed to a grounded instrument transformer 20, and the lightning arrester 21 is replaced with one having a discharge current larger than that of the first embodiment and having a larger outer shape.
The iron core 22 of the instrument transformer 20 is arranged so that the iron core 22 is in the front-rear direction of the carriage 6 in order to suppress a decrease in accuracy due to the influence of the magnetic field of the other phase.
The iron core 22 provided in each phase of the three-phase configuration of the instrument transformer 20 is formed as a ring-shaped structure in which the width of the magnetic plate is an axial dimension in the shape of a wound core around which a belt-shaped magnetic plate is wound. The wound core structure extends in the front-rear direction of the carriage 6 and is arranged in parallel with each other in a state where the winding core is erected on the bottom surface portion 6A of the carriage 6 with the winding axis direction horizontal.

  In the second embodiment, the frames constituting the carriage 6 can share the same frames as in the first embodiment, and the influence of changing the instrument transformer and increasing the size of the lightning arrester is suppressed. At the same time, the center of gravity of the carriage 6 is restrained from moving upward from a low position on the floor surface.

  In the above description, the lightning arrester 11 or the lightning arrester 21 has been shown as being fixed to the back plate 6B erected on the wall side (rear surface) of the L-shaped carriage 6, but the carriage 6 is provided with a ceiling surface, You may make it fix a lightning arrester to this ceiling surface.

In Embodiment 2 according to the present invention, in any of the configurations in Embodiment 1 described above, the iron core 22 of each phase in the instrument transformer 10 extends in parallel in the front-rear direction of the carriage 6. To be arranged.
Thereby, in addition to the effect in Embodiment 1 mentioned above, it can suppress that a precision falls by the influence of the magnetic field of another phase.

  In the present invention, within the scope of the invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 Switch gear 2 The main bus line which penetrates several switch gears and becomes a common electric circuit is shown.
3 Indicates the branch bus of the switchgear connected with the main bus using the line contact.
4 Circuit breaker and switchgear-side conductor mated with the terminal of a drawer-type carriage equipped with an instrument transformer and a lightning arrester 5 Circuit breaker 6 A drawer-type carriage equipped with an instrument transformer and a lightning arrester 7 Switch gear-side conductor that fits into terminal 8 Conductor connected to high-voltage cable 9 High-voltage cable 10 Instrument transformer 11 Arrester 12 Insulation support 13 Switch at the operating position of a drawer-type dolly equipped with an instrument transformer and arrester High voltage terminal 14 for mating with the conductor of the gear 14 Transformer connection cable 15 for connecting the transformer for the instrument and the terminal of the truck 15 Lightning arrester connection cable 16 for connecting the arrester to the terminal of the truck Conductor to be connected 17 Cable connecting the grounding part of the lightning arrester to the grounding terminal of the carriage 18 Grounding terminal connected to the grounding part of the lightning arrester 19 Hu on the primary side of the transformer 20 Grounded potential transformer 21 the discharge current is large, a large surge arrester 22 earth type instrument transformer core profile.

Claims (7)

In the switchgear in which the instrument transformer and the lightning arrester are arranged in the same drawer type carriage, a high voltage portion connected to the instrument transformer and the arrester is provided in the middle stage of the carriage as viewed from the side, and the high voltage The instrument transformer is disposed below the unit, and the lightning arrester is disposed on the upper side of the high voltage unit in a vertical direction with the high voltage side connected to the high voltage unit being lower than the ground side. Switch gear characterized by High-voltage side of said lightning arrester is connected to the high voltage unit, and wherein the ground side of the arresters be those that are connected to the grounding portion conductor, which is the ground portion conductor on the upper side of the front Symbol arrester is located The switchgear according to claim 1.   The switchgear according to claim 1 or 2, wherein the instrument transformer is attached to a floor portion of the carriage. Switchgear according to any one of claims 1 to 3, characterized in that the arrester is fixed to the wall or ceiling of the carriage.   2. The switch according to claim 1, wherein a high-voltage terminal provided on the carriage for fitting the carriage with a bus-side terminal at an operation position is integrally supported by an insulator in three phases. gear.   6. The switchgear according to claim 1, wherein the grounding side of the lightning arrester is connected to each of three-phase terminals by a rigid conductor having a predetermined width.   2. The switchgear according to claim 1, wherein an iron core of the instrument transformer is arranged to extend in a front-rear direction of the carriage.

Images