JP2016101058A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchgear whose installation space can be compacted.SOLUTION: A switchgear includes, in one frame 30, switch devices (VCB, DS, LDS, EDS, ES) corresponding to a first power system 1A and second power system 1B and cable termination connection units 32A, 32B, 32C, and a connection bus 38 and connection conductor 39 for electrically connecting the switching devices with the cable termination connection units. A first operation maintenance surface 33A for performing operation of the first power system and second operation maintenance surface 33B for performing operation of the second power system are arranged on both sides so as to face each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a switchgear that is installed in a substation or the like and performs open / close control of a power circuit.

  For example, as shown in FIGS. 1 and 2 of Patent Document 1, the conventional switchgear includes a switchgear that includes CB storage portions 1B and 3A with respect to the cable drawing direction (rightward in FIG. 1). Arranged in a direction perpendicular to the direction (vertical direction in FIG. 1), the operator of the substation operates from the left side to the right side in FIG. This is because a normal switchgear generally has one side of the switchgear as an operation surface, and a cable connection portion on the opposite side of the operation surface across the switchgear body. The power line from the power receiving point through the switch gear to the transformer is arranged in a straight line, and in the substation with such an arrangement, a plurality of switch gears having the above configuration are juxtaposed. This is because the simplest arrangement is to arrange a plurality of switch gears in a direction perpendicular to the cable drawing direction.

JP-A-8-140228 (page 3-4, FIGS. 1 to 6) JP 2000-287319 A (page 6-7, FIG. 1, FIG. 9)

The conventional switchgear needs to arrange a plurality of switchgears in a direction perpendicular to the extending direction of the power line from the power receiving point of the substation to the transformer through the switchgear. It was necessary to make a large space in the direction orthogonal to the extending direction. In recent years, there has been a strong demand for downsizing of substation space. Therefore, downsizing of switchgear installation space has been demanded, but it has been difficult to reduce installation space with switchgears configured as described above. It was.
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a switch gear that can reduce the installation space of the switch gear.

The switchgear according to the present invention includes a switching conductor corresponding to the first power system and the second power system, a cable termination connection portion, and a connection conductor that electrically connects the switching device and the cable termination connection portion. The first operation maintenance surface for operating the first power system and the second operation maintenance surface for operating the second power system are arranged on both sides so as to face each other. Is.
In addition, an operation maintenance surface for operating and maintaining the power system is provided with a switchgear corresponding to one power system, a cable terminal connection portion, and a connection conductor connecting the switch device and the cable terminal connection portion. The first and second unit switch gears provided on one side surface are arranged back to back, and the operation maintenance surfaces face each other at positions farthest from each other.

  The present invention comprises a casing having a connection conductor that electrically connects the switchgear and the cable terminal connection part, and the switchgear and the cable terminal connection part corresponding to the first power system and the second power system, The first operation / maintenance surface for operating the first power system and the second operation / maintenance surface for operating the second power system are arranged on both sides so as to face each other. The degree of integration can be increased, and the installation area can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a single line connection diagram of a power receiving facility to which a switchgear according to Embodiment 1 of the present invention is applied. It is a single line connection diagram inside the switchgear of Embodiment 1 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 1 of this invention. It is a single line connection figure inside the switchgear of Embodiment 2 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 2 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 3 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 4 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 5 of this invention. FIG. 9 is a top view of FIG. 8. FIG. 9 is a rear view of FIG. 8. It is a single line connection figure inside the switchgear of Embodiment 6 of this invention. It is a sectional side view which shows the structure inside the switchgear of Embodiment 6 of this invention.

Embodiment 1
Hereinafter, the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. 1 is a single line connection diagram of a power receiving facility to which the switchgear according to Embodiment 1 of the present invention is applied, FIG. 2 is a single line connection diagram inside the switchgear according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. It is a sectional side view which shows the structure inside the switchgear of form 1.
FIG. 1 shows an example of single-wire connection of a gas insulated switchgear when the common-backup 2-line power receiving system is adopted. In this example, one transformer for current transformer (PCT) and a transformer primary circuit breaker are provided, and a PCT bypass circuit is provided. In the figure, 1 is a power receiving unit, 2 is a PCT unit, 3 is a transformer primary unit, 4 is a PCT bypass unit that bypasses and connects the PCT, and 4A is a bypass switch. 5 is a PCT, and 6 is a transformer. The power receiving unit 1 houses a disconnector 7, a lightning arrester 8, a ground switch 9, a cable head 10, a circuit breaker (VCB) 11, a ground switch 12, and the like. The transformer primary unit 3 is connected to a transformer 6. 13 is a bus disconnector, 14 is a PCT disconnecting disconnector, and 15 is a ground switch. The transformer primary unit 3 includes a transformer primary circuit breaker 16 and a ground switch 17.
Reference numeral 18 surrounded by a one-dot chain line is a switchgear according to the present invention.

FIG. 2 is a single line connection diagram inside the switchgear according to the first embodiment of the present invention, and drawing-in portions 1A and 1B having current transformers CT are provided at two places on the left and right of the bottom of one housing 30. The cable terminal connection portions 32A and 32B are arranged. In addition, a drawer portion 31 is provided on the upper portion of the housing 30 and a cable terminal connection portion 32C is disposed. In the housing 30, two vacuum circuit breakers VCB are disposed, and one end sides thereof are connected to the lead-in portions 1A and 1B via the disconnect switch DS, the ground switch ES, and the cable terminal connection portions 32A and 32B, respectively. . Further, the other ends of the vacuum circuit breaker VCB are connected to each other by a common connection bus 38, and further connected to the lead-out part 31 via the disconnector LDS and the cable terminal connection part 32C. The cable end connection portions 32A and 32B are T-shaped, and the connection portion at one end in the horizontal direction of the T shape is connected from the horizontal direction to a terminal led out from the housing 30 side in the horizontal direction, and the connection portion at the other end is plugged. A test power supply for withstand voltage test can be connected from the outside by detachably mounting it. Further, the end portion of the cable 40 raised from the lower side to the upper side is connected to the connecting portion that opens downward to the T-shaped vertical leg portion.
In addition, a branch from the connection bus 38 is connected to a grounded instrument transformer EVT mounted on the upper part inside the housing 30 through a disconnector EDS which is a three-position switch (connection-disconnection-grounding). ing.

FIG. 3 is a side sectional view showing a specific configuration inside the switch gear according to the first embodiment of the present invention. In the figure, the left side is the front (front surface) of the switch gear, and the right side is the rear surface. Reference numeral 30 denotes a housing of the power receiving switch gear 18, which is a rectangular sealed tank in FIG. 3 and encloses an insulating gas such as SF 6 gas or dry air. The front surface (left side in FIG. 3) of the housing 30 is a maintenance operation surface (front side) 33A, and the rear surface (right side in FIG. 3) is a maintenance operation surface (rear side) 33B.
The maintenance operation surface 33A and the maintenance operation surface (rear side) 33B are equipped with a circuit breaker operation mechanism 35, a disconnection device operation mechanism 36, and a grounding switch operation mechanism 37, and a cable for connecting a cable 40 drawn from the outside. Terminal connection portions 32A and 32B are also mounted. The circuit breaker operating mechanism 35, the disconnecting switch operating mechanism 36, and the earthing switch operating mechanism 37 are used for opening and closing operations during the operation of the switchgear, and the cable terminal connection portions 32A and 32B, the disconnecting switch operating mechanism 36, and the earthing switch The operation mechanism 37 is used for disconnecting a non-test circuit or applying a test voltage during a withstand voltage test of a cable or the like during installation or maintenance. Therefore, the maintenance operation surfaces 33A and 33B are important places for the operation (maintenance / operation) of the switch gear, and are referred to as “maintenance / operation surfaces” for the time being.

  In addition, inside the housing 30, reference numeral 38 denotes a connection bus, which connects one terminal of each of the two vacuum circuit breakers VCB. The connection bus 38 includes connection portions 38A and 38B at both ends, and the connection buses 38A and 38B are connected in a state in which the connection bus 38 can be slightly slid in the axial direction. For this reason, in FIG. 3, the influence of the deformation of each part due to the dimensional error between the devices of the left and right systems or the thermal expansion accompanying the operation of the switch gear is absorbed by the connecting parts with the connecting parts 38A and 38B. .

Reference numeral 32 </ b> C denotes a cable terminal connecting portion that is attached through the side wall surface of the housing 30, and the tip thereof is connected to the transformer 6. Further, it is electrically connected to the cable terminal connection portion 32C via the disconnector LDS so as to branch upward from the connection bus 38. Similarly, a grounding-type instrument transformer EVT mounted on the front upper side of the housing (sealed tank) 30 (that is, the upper wall of the housing 30) via the disconnector EDS so as to branch upward from the connection bus 38. Electrically connected.
Further, as shown in FIG. 3, the disconnector EDS, the disconnector LDS, and the grounded-type instrument transformer EVT are disposed above the connection bus 38, so that the space in the narrow casing (sealed tank) can be used without waste. I am doing so.
Further, reference numeral 39 denotes a connection conductor, and in the housing 30, switchgear (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, grounding switch ES), connection bus 38, cable termination connection part 32 </ b> A. 32B and 32C are electrically connected to each other.

Reference numeral 41 denotes a frame that supports the housing 30 from below. Reference numeral 42 denotes a front cover that covers the front part of the switch gear, and reference numeral 43 denotes a rear cover that covers the rear part of the switch gear. The circuit breaker operating mechanism 35, the disconnecting switch operating mechanism 36, the grounding switch disposed therein. The operation mechanism 37 and the cable end connection portions 32A and 32B are protected from contamination due to the external environment and the operator from accidentally touching the devices.
Note that this switch gear is usually for three phases, and only one phase is shown in the figure, but switchgear (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, ground switch ES), connection The bus bar 38 and the connection conductor 39 are arranged for three phases in the depth direction of the drawing.

In FIG. 3, the connection bus 38 is illustrated as simply connecting the connection portions 38 </ b> A and 38 </ b> B arranged on the left and right. In this case, when the switching device (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, ground switch ES) side is viewed from the maintenance operation surface (front surface) 33A, the maintenance operation surface (rear surface) 33B The phase sequence of the three-phase circuit is different on the left and right when viewed from the side of the switchgear (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, ground switch ES).
For this reason, although not shown in FIG. 3, the maintenance operation surface (front surface) 33A is arranged by crossing the connection buses on both sides of the connection buses 38 for each phase as viewed from above the switch gear. When the switchgear (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, grounding switch ES) side is viewed from the side, the switchgear (breaker VCB, disconnector DS) from the maintenance operation surface (rear surface) 33B The phase sequence of the three-phase circuit can be made the same even when the disconnector EDS, the disconnector LDE, and the ground switch ES) are viewed. By doing this, even if the switchgear (breaker VCB, disconnector DS, disconnector EDS, disconnector LDE, grounding switch ES) is removed and replaced on the front or rear of the switchgear, It becomes possible to operate without worrying.

  In the above configuration, the substation equipment is configured by connecting the lead portion 31 (terminal connection portion 32 </ b> C) and the transformer 6 with the cable 40.

Embodiment 2
4 is a single line connection diagram inside the switchgear according to the second embodiment of the present invention, and FIG. 5 is a side sectional view showing a configuration inside the switchgear according to the second embodiment of the present invention. The grounding-type instrument transformer EVT, disconnector EDS, and disconnector LDS above the connection bus 38 shown in the first embodiment are omitted, and the configuration is simplified.

Embodiment 3
FIG. 6 is a side sectional view showing the internal structure of the switchgear according to the third embodiment of the present invention. In the first embodiment, a T-shaped cable terminal connecting portion 32A is connected to a terminal portion led out from the housing 30 in the horizontal direction. , 32B is shown with the T-shaped vertical foot portion turned downward, but in this third embodiment, for example, a cable terminal connection device described in Japanese Patent Application Laid-Open No. 2012-10482 Is used to attach a connection portion at one end of the T-shaped arm end portions of the T-shaped cable terminal connection portions 32A and 32B from the lower side to the terminal portion that is led out vertically from the housing 30. The end of the cable 40 raised from the lower side to the upper side is connected to the end connection part (the connection part opened downward), and a plug is attached to the connection part of the opening of the T-shaped leg part in the horizontal direction. Can be detachably mounted and withstand voltage from the outside It is set to be connected to test the power supply for the experience.

Embodiment 4
FIG. 7 is a side sectional view showing the internal structure of the switchgear according to Embodiment 4 of the present invention. In the fourth embodiment, similarly to the third embodiment, the connection portion at one end of the T-shaped arm terminal portions of the T-shaped cable terminal connection portions 32A and 32B is provided below the terminal portion led out vertically from the housing 30. Is attached to the other end of the T-arm, and the end of the cable 40 that is raised upward from below is connected to the connecting portion (opening downward), and the T-shape is directed horizontally. A plug is detachably attached to the connecting portion of the opening of the foot so that a test power source for a withstand voltage test can be connected from the outside. The difference from the third embodiment is that the grounded instrument transformer EVT, the disconnector EDS, and the disconnector LDS above the connection bus 38 shown in the third embodiment are omitted, and the configuration is simplified. .

Embodiment 5
8 to 10 show a fifth embodiment of the present invention, FIG. 8 is a side sectional view showing an internal configuration of a switchgear according to a fifth embodiment of the present invention, FIG. 9 is a top view of FIG. 8, and FIG. FIG. 9 is a rear view of FIG. 8. In the first embodiment to the fourth embodiment, the example in which the connection bus bar 38 for connecting the front and rear switchgears of the switch gear 18 to each other is provided in the housing 30 has been described. 5, the housing 30 shown in the first embodiment is separated into two tanks, a front tank 30A and a rear tank 30B, and the front side of the switch gear 18 and the cable bus 45 are arranged on the outside by the solid insulated bus 44 or the cable bus 45. The switchgears arranged on the rear side are connected to each other.

FIG. 9 is a top view of FIG. 8. In FIG. 9, the front tank 30A and the rear tank 30B are arranged in two rows in the vertical direction, and in FIG. 9, between the front tank 30A and the rear tank 30B in the lower row. They are connected by three phases, that is, three solid insulated buses 44 or cable buses 45. Further, the solid insulation bus 44 or the cable bus 45 is arranged in the horizontal direction (vertical direction in FIG. 9) between the front tanks 30A and electrically connected to each other. In FIG. 9, a disconnector LDS is disposed in the upper front tank 30A, and the end of the disconnector LDS penetrates the side wall of the front tank 30A (upper side in FIG. 9) to connect the cable terminations for three phases. Wearing 32C.
Further, in the rear tank 30B, a disconnector EDS and a grounded instrument transformer EVT connected to the tip of the disconnector EDS are arranged.
FIG. 10 is a rear view of FIG. 8, and a solid insulation bus 44 or a cable bus 45 that electrically connects the left and right is arranged on the upper portion of the rear tank 30B. Further, a cable terminal connection portion 32C is attached to the side portion.

With such a configuration, when the solid insulation bus 44 or the cable bus 45 is used for connection between the housings 30 (the front tank 30A and the rear tank 30B), the grounded instrument transformer is provided in one housing 30. Although it is difficult to arrange the EVT, it is possible to easily connect each other by the solid insulation bus 44 or the cable bus 45 by dividing the casing into a plurality of parts as in the fifth embodiment. In addition, as shown in FIG. 8, the housing is divided into a front tank 30A and a rear tank 30B, and maintenance operation surfaces 33A and 33B are provided on one surface, so that a switch gear corresponding to a standard one-side operation can be obtained. Even when the length of the switch gear in the front-rear direction is different for each installation site, it can be easily handled. In this case, as shown in FIG. 8, the front tank 30A and the rear tank 30B may be connected by a cylindrical connecting tank 30C that connects the front and rear, and the connecting tank 30C is not used, and the front tank 30A and the rear tank are not used. 30B may be configured as an independent airtight tank.

Embodiment 6
11 and 12 show the sixth embodiment, FIG. 11 is a single line connection diagram inside the switchgear according to the sixth embodiment of the present invention, and FIG. 12 shows the configuration inside the switchgear according to the sixth embodiment of the present invention. It is a sectional side view. In the sixth embodiment, a lightning arrester is added to the configuration of the first embodiment. In FIG. 11, SAR is a lightning arrester, and RL is a removable link having a switch function for connecting / disconnecting the lightning arrestor SAR and the main circuit.
In FIG. 12, the lightning arrester SAR is inserted into the front tank 30A through the hole provided in the bottom of the front tank 30A and facing upward. The tip of the lightning arrester SAR is connected to the SAR connection terminal 50 mounted on the innermost side of the ground switch ES. The SAR connection terminal 50 is disconnected from the main circuit by being disconnected from the SAR contact 52 that operates in conjunction with the movable contact 51 of the ground switch ES. The SAR connection terminal 50 and the SAR contact 52 constitute a connection switch of the lightning arrester SAR, that is, a removable link. When the ground switch ES is ON (ground state), the SAR connection terminal 50 and the SAR contact 52 are dissociated, and when the ground switch ES is OFF (non-ground state), the SAR connection terminal 50 and the SAR contact 52 are connected. become.
With this configuration, the rear space of the ground switch ES among the narrow spaces in the housing can be used more effectively, and the switch gear 18 can be configured compactly.

In addition, in FIG. 12, the connection bus 38 is shown in a state where there are three central portions. However, there are three connection buses 38 for three phases, which are arranged in the depth direction of the page in FIG. The phase conversion is performed by displacing the conductors on both sides to cross each other in the height direction at the center.
By adopting such a configuration, the phase sequence of the open / close devices mounted on the maintenance operation surfaces 33A and 33B can be made the same, so that the maintenance and operation of the switch gear 18 are facilitated.
The housing 30 is separated into a front tank 30A and a rear tank 30B, and the two tanks are connected by a connecting tank 32C. With this configuration, each switchgear can be made smaller than those provided with maintenance operation surfaces on both sides, which facilitates transportation to the installation site and the distance between the cable lead-in portions 1A and 1B. Can be easily handled by changing only the connecting tank 30C and the connection bus 38.

  In the first to sixth embodiments described above, the case of the gas-insulated switchgear in the case of adopting the common-spare two-line power receiving method has been described. For example, in the distribution substation, the voltage is stepped down from the transmission voltage to the distribution voltage Even if it is applied to a switchgear for the purpose, the same effect as the above embodiment can be obtained. The switch gear 30 has been described for one set. For example, two sets of switch gears are prepared, and the retracting portion 1A of one switch gear 18 is used as a power receiving portion, and the retracting portion 1B of the other switch gear 18 is also provided. By connecting the lead-in part 1B of one switch gear 18 and the lead-in part 1A of the other switch gear 18 to each other and connecting the lead-out part 31 of each switch gear 18 to the transformer 6, respectively. A two-bank transformer can be configured. Furthermore, by preparing three or more sets of switch gears 18 and connecting them together as described above, it becomes possible to configure a substation facility with three or more banks as described above.

  In the above description, it has been explained that the present invention can be used for a gas-insulated switchgear. However, the same effect can be obtained by applying to a switchgear other than gas insulation such as air insulation.

DESCRIPTION OF SYMBOLS 1 Power receiving unit, 1A Pull-in part (1st power system), 1B Pull-in part (2nd power system), 2 PCT unit, 3 Transformer primary unit, 4 PCT bypass unit, 4A bypass switch, 5 PCT, 6 Transformer , 7 Disconnector, 8 Lightning Arrester, 9 Ground Switch, 10 Cable Head, 11 Circuit Breaker (VCB), 12 Ground Switch, 13 Bus Disconnect, 14 PCT Disconnect Switch, 15 Ground Switch, 16 Transformer Primary circuit breaker, 17 Ground switch, 18 Switchgear, 30 Housing, 30A Front tank, 30B Rear tank, 30C Connection tank, 31 Drawer part, 32A Cable terminal connection part, 32B Cable terminal connection part, 32C Cable terminal connection part, 33A Maintenance operation surface (front surface), 33B Maintenance operation surface (rear surface), 35 Circuit breaker operation mechanism 36, disconnect switch operating mechanism, 37 earthing switch operating mechanism, 38 connection bus, 38A connection, 38B connection, 39 connection conductor, 40 cable, 41 mount, 42 front cover, 43 rear cover, 44 solid insulation bus, 45 Cable bus, 50 SAR connection terminal, 51 ES movable contact, 52 SAR contact, CT current transformer, DS disconnector, EDS disconnector, ES grounding switch, EVT grounding type instrument transformer, LDS disconnector, RL Removable link, SAR lightning arrester, VCB vacuum circuit breaker

Claims (14)

The housing includes a switchgear corresponding to the first power system and the second power system, a cable terminal connection part, and a connection conductor for electrically connecting the switchgear and the cable terminal connection part. A switchgear characterized in that a first operation / maintenance surface for operating one power system and a second operation / maintenance surface for operating the second power system are arranged opposite to each other. One side of the operation maintenance surface for operating and maintaining the power system is provided with a switchgear corresponding to one power system, a cable termination connection part, and a connection conductor connecting the switchgear and the cable termination connection part. The switchgear is characterized in that the first and second unit switchgear provided in the above are arranged in a back-to-back manner, and the operation maintenance surfaces face each other at positions farthest from each other. The switchgear according to claim 1 or 2, wherein the operation maintenance surfaces face each other in a direction orthogonal to the direction in which the switchgear and the transformer are arranged. The switchgear according to any one of claims 1 to 3, wherein the switchgear is any one of a circuit breaker, a load switch, a disconnect switch, and a ground switch. The switchgear according to any one of claims 1 to 4, wherein an operation mechanism and a cable terminal connection portion of the switchgear are attached to the operation maintenance surface. The first and second unit switchgears or the ends of the switchgear corresponding to the first power system and the second power system are electrically connected to each other by connection buses for each phase. The switchgear according to any one of claims 1 to 5, wherein The switchgear according to claim 6, wherein the length of the connection bus bar is variable. The same phase sequence between the power systems of the first and second unit switchgears, or between the first power system and the second power system, as viewed from the operation maintenance surface side. The switchgear according to claim 6 or 7, wherein the switchgear is connected by the connecting bus. The switchgear according to any one of claims 6 to 8, wherein a disconnector or a load disconnector is disposed above the connection bus. The switchgear according to any one of claims 6 to 8, wherein an instrument transformer is disposed above the connection bus. The switchgear according to any one of claims 1 to 8, wherein an instrument transformer is disposed on an outer side portion of the casing. The switchgear according to claim 10 or 11, wherein the switchgear is connected by a switch that opens and closes between the instrument transformer and the connection bus. 14. The switchgear according to claim 1, wherein the cable terminal connection portion has a connection portion directed downward and forward or rearward. The switchgear according to any one of claims 6 to 8, wherein the connection bus is a solid insulation bus or a cable bus arranged outside the housing.

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