JP2002186126A - Main circuit switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main circuit switchgear which can precisely reduce an installation space, while properly securing work efficiency at assembling and maintenance. SOLUTION: This main circuit switchgear is equipped with metal containers 44, each of which houses a breaker 33 for the main circuit and a disconnector 31, extended in the axial direction of a bus conductor and electrically connected and which are separately provided at each phase, a support frame 23 where the metal containers 44 are placed on the frame supported by feet 23a, and a metal container 24 which houses a transformer 18 for a meter connected via a bushing 34 right below in the axial direction of the bus conductor to the breaker 33, a transformer 18 for a meter connected via a bushing 32 right under in the axial direction of the bus conductor to the disconnector 31, a capacitor 19 for surge absorption, and a lighting arrester 20 and is provided under the support frame 23, and the feet 23a of the support frame 23 is arranged, except for the section right below a center XC in the axial direction of the conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a main circuit switching device, and more particularly to a power generating main circuit switching device used between a main generator and a main transformer in a low-voltage synchronous system of a power plant.

[0002]

2. Description of the Related Art FIG. 6 is a single-line diagram of a high-voltage synchronous power generation main circuit described in Japanese Patent Application Laid-Open No. 8-306282. In FIG. 6, 1 is a generator, 2 is a main transformer, 3 is an in-house transformer, 4 is a starting transformer, 5 to 8 are circuit breakers, 9 is a bus, 1
Reference numerals 0 and 11 denote transmission lines, and the generator 1 is directly connected to the main transformer 2 and connected to the transmission line 10 via the circuit breaker 5. The generator 1 and the main transformer 2 are connected to the bus 9 via the in-house transformer 3 and the circuit breaker 6. The starting transformer 4 is connected to a bus 9 via a circuit breaker 7 and to a transmission line 11 via a circuit breaker 8.

Conventionally, generally, when starting a generator,
As shown in FIG. 6, a high-voltage synchronization system in which the generator 1 and the main transformer 2 are directly connected is employed. Recently, instead of the high-voltage synchronization system, a low-voltage synchronization system in which the starting transformer 4 is unnecessary is used. It has been adopted.

FIG. 7 is a single-line diagram of a low-voltage synchronous power generation main circuit described in Japanese Patent Application Laid-Open No. 8-306282. In the case of this low-pressure synchronous system, a main circuit opening / closing device 12 is installed on the input side of the generator 1 in the power generation main circuit.

FIG. 8 is a single-line diagram of a conventional power generating main circuit switching device. As shown in FIG. 7, the main circuit switching device 12
It is composed of a main circuit breaker 13, a main circuit disconnector 14, a disconnecting side grounding device 15, a disconnector side grounding device 16, an instrument current transformer 17, and the like. The power generation main circuit is a cubicle that houses an instrument transformer 18, a surge absorbing capacitor 19 for abnormal voltage protection, and a surge arrester 20, which are installed for the purpose of measuring the voltage of the main circuit and protecting the abnormal voltage, in addition to the main conductor and the switchgear. 21.

FIG. 9 is a single-line diagram of a power generation main circuit switching device integrated with a cubicle. Generally, as shown in FIG. 9, the generator side (the circuit breaker side in the main circuit switchgear)
The cubicle 22 has an instrument transformer 18, and the cubicle 21 on the main transformer side (the disconnector side in the main circuit switchgear) has the instrument transformer 18 and the surge absorbing capacitor 1.
9 and the lightning arrester 20 are stored.

Conventionally, each of the above-described devices has been configured as a single device to constitute a power generation main circuit. However, by integrating them all, the installation area can be reduced and the manufacturing cost can be reduced. For this reason, recently, a power generation main circuit switchgear in which these devices are integrally combined has been increasingly used. However, in such a case, since all the devices are integrated into one, there is a dislike that the assembling / maintenance properties are worse than in the case where the power generation main circuit has been configured as a single device until now. In particular, in terms of assembling / maintenance for the device section housed in the cubicle, there is a problem in workability such as the legs of the support gantry being in the way.

[0008] The switchgear for the power generation main circuit integrated as described above has the following problems since it is configured as described above. FIG. 10 is a side view of a conventional main circuit switching device viewed from a conductor axis direction. Conventionally, in FIG. 10, the legs 23 constituting the support gantry are disposed immediately below the three-phase conductor axial center. Therefore, the instrument transformer 18, the surge absorbing capacitor 19 for abnormal voltage protection and the lightning arrester 2 installed in the second metal container 24.
The assembly / maintenance of “0” is performed only from the direction of the interphase 25 or 26. In order to be able to work from 26 directions, it is necessary to secure the work space, and the installation space is correspondingly large. Further, the work from the inter-section 27 has a small space, and it is difficult to perform work such as assembly, maintenance and inspection. In order to solve these problems, it is necessary to reduce the installation space of the main circuit switchgear and to maintain the same maintainability as in the conventional cubicle.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a main circuit opening / closing device capable of appropriately reducing the installation space while appropriately ensuring workability during assembly and maintenance.

[0010]

According to a first aspect of the present invention, there is provided a main circuit opening / closing device which accommodates a main circuit interrupting portion and a disconnecting portion which extend in the axial direction of a bus conductor and are electrically connected to each other. A first metal container provided for each phase, a support frame for mounting the first metal container on a frame supported by legs, and a bushing in the blocking portion immediately below the bus conductor in the axial direction. An instrument transformer, an instrument transformer, a surge absorbing capacitor, and a surge arrester connected via a bushing directly below the bus conductor to the disconnecting portion via the bushing are housed at the lower part of the support base. And a second metal container, wherein the legs of the support gantry are arranged other than immediately below the center in the conductor axial direction.

In the main circuit opening / closing device according to the second aspect of the present invention, the main circuit interrupting portion and the disconnecting portion which extend in the axial direction of the bus conductor and are electrically connected to each other are housed and provided for each phase. A first metal container, a support gantry for mounting the first metal container on a gantry supported by legs, and an instrument connected to the blocking portion via a bushing immediately below the busbar conductor in the axial direction. A second metal container provided at the lower part of the support gantry for accommodating an instrument transformer, a surge absorbing capacitor, and a surge arrester connected to the disconnecting portion via a bushing immediately below the bus conductor in the axial direction. And the legs of the support frame are arranged between the phases.

In the main circuit switchgear according to a third aspect of the present invention, the instrument transformer connected from the disconnecting section and the instrument transformer, the surge absorbing capacitor, and the surge arrester connected from the disconnecting section are each a mounting member. To be formed as a unit.

In the main circuit switching device according to a fourth aspect of the present invention, there is provided a disconnection section operation device for driving an operation shaft connected to an interruption section operation device for driving a movable contact of a current interruption section and a movable contact for a disconnection section. The connected operation shaft is integrated between the first metal container mounted on the upper part of the support base and the instrument transformer, the capacitor for surge absorption and the storage part of the lightning arrester provided on the lower part of the support base. It has a partitioned structure.

In the main circuit switchgear according to a fifth aspect of the present invention, an instrument transformer connected from a breaking portion via a bushing, an instrument transformer connected from a voltage disconnecting portion via a bushing, and a surge absorbing device. The condenser and the lightning arrestor
The main circuit switchgear according to claim 1 or 2, wherein the main circuit switchgear has a structure partitioned by a partition member.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a device configuration of a power generating main circuit switching device according to Embodiment 1. FIG. 2 is a side view showing details of the power generating main circuit switching device according to the first embodiment. FIG. 3 is a front view showing a maintenance space according to the first embodiment.

In the figure, 18 is an instrument transformer, 19 is a surge absorbing capacitor, 20 is an arrester, 23 is a support frame, 23a is a leg of the support frame 23, 24 is a second metal container, and 25 is an interphase direction. (FIG. 10), 26 is a maintenance direction from the outside of the end phase (FIG. 10), and 27 is an interphase part (FIG. 1).
0) and 28 are conductor axis directions, 31 is a disconnection portion, 32 is a second bushing, 33 is a blocking portion, 34 is a first bushing,
35 is a disconnector-side cubicle component mounting plate, 36 is a circuit breaker-side cubicle component mounting plate, 37 is a cubicle component unit, 38 is a breaker movable contactor, 40 is a breaker operating shaft, and 41 is a disconnector movable contact. Reference numeral 43 denotes a disconnection portion operation shaft, and reference numeral 44 denotes a first metal container. The disconnecting portion 31 and the current interrupting portion 33 provided in each phase are disposed to extend on the conductor axis direction center virtual line XC in the conductor axis direction 28 of the bus conductor, and the first metal container for each phase is provided. 44. The legs 23a of the gantry on which the first metal containers 44 for the three phases are mounted are other than immediately below the conductor axis direction center imaginary line XC, and are between the first metal containers 44 and between them. 27 is located below the vertical space.

FIG. 3 is a front view of the power generation main circuit switchgear. As shown in FIG.
7 shows a cubicle-constituting equipment maintenance space when it is arranged at 7. That is, the support base 2
By disposing the third leg 23a in the interphase part 27, assembly and maintenance from the interphase direction 25 (FIG. 10) becomes impossible, but work from the main circuit axial direction 28 is possible as shown in FIG. Becomes A phase separation bus 29 is connected in the main circuit axial direction 28, and the dead space of the main conductor lower part 30 is effective for maintenance. Further, the maintenance space 47 (FIG. 10) outside the end phase is not required,
The installation area can be reduced.

FIG. 1 is a front view showing a device configuration of a power generating main circuit switching device according to Embodiment 1 of the present invention. As shown in FIG.
The cubicle component device connected via a bushing 34 and the cubicle component device connected via a bushing 34 are configured as units 37 by being attached to metal plates 35 and 36, respectively.
By arranging the legs 23a of the third section other than between the phases 27 or just below the center in the conductor axis direction, it is possible to insert / remove the cubicle components from the conductor axis direction 28 by the unit batch 37 as shown in FIG. Therefore, the maintainability can be improved even for the cubicle component device disposed at the center of the second metal container 44.

In the first embodiment, the main circuit interrupting section, the disconnecting section, the installation device, and the like, which are electrically connected to each other, are integrally covered with the grounded first metal container. And a disconnection for driving a movable contact of the voltage disconnecting portion in a second metal container provided at a lower portion of the support base, for driving a movable contact of the current interrupting portion. A first insulated bushing, which is disposed through the unit operating shaft and the connecting portion between the first and second metal containers and is connected to the interrupting unit, and a second bushing connected to the disconnecting unit, respectively. An instrument transformer arranged in the second metal container and connected to the first insulating bushing, an instrument transformer respectively connected to the second insulating bushing, a surge absorbing capacitor, and a lightning arrester In the main circuit switching device formed by accommodating, characterized in that the legs of the support cradle and placed besides interphase or conductors axial center immediately below the.

Further, in the first embodiment, in the configuration described in the preceding paragraph, an instrument transformer connected from the interrupting section via the bushing and an instrument transformer connected from the disconnecting section via the bushing, The capacitor and the lightning arrester are each formed as a unit by being attached to a metal plate.

According to the first embodiment of the present invention, the main circuit interrupting portion 33 and the disconnecting portion 31 which extend in the axial direction 28 of the bus conductor and are electrically connected to each other are housed, and the A first metal container 44 provided, a support frame 23 for mounting the first metal container 44 on a frame supported by the leg portions 23a, and a bushing in the blocking portion 33 immediately below the bus conductor in the axial direction. An instrument transformer 18 connected via a bus 34 and an instrument transformer 18, a surge absorbing capacitor 19, and a surge arrester 20 connected to the disconnecting portion 31 via a bushing 32 immediately below the bus conductor in the axial direction are housed. And a second metal container 24 provided below the support gantry 23, wherein the leg 23a of the support gantry 23 is arranged at a position other than immediately below the conductor axial center XC,
Since the legs 23a of the support gantry 23 are arranged in the interphase 27, it is possible to obtain a main circuit opening / closing device capable of appropriately reducing the installation space while appropriately ensuring workability during assembly and maintenance.

Embodiment 2 FIG. Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is a side view showing the configuration of the power generating main circuit switching device according to the second embodiment. The second embodiment has the same general configuration as the first embodiment shown in FIGS. 1 to 3 except for the specific configuration described in the second embodiment. In the figure, reference numeral 24 denotes a second metal container, 39 denotes an interrupter operating device, 40 denotes an operating shaft,
42 is a disconnection section operation device, 43 is an operation shaft, 44 is a first metal container, and 45 is a partition member made of a metal plate or an insulating plate.

As shown in FIG. 4, a disconnecting section operating device for driving a movable contact 41 of the disconnecting section 31 and an operating shaft 40 connected to an interrupting section operating device 39 for driving the movable contact 38 of the current interrupting section 33. By arranging the operation shaft 43 connected to 42 between the first metal container 44 and the second metal container 24, insulation between the instrument transformer, the surge absorbing capacitor, and the lightning arrester and the operation shaft is achieved. The tolerance for the distance increases, and the degree of freedom in designing the arrangement of the cubicle components and the selection of the devices increases. Further, by providing a structure in which the operation shaft, which is a movable portion, is partitioned by a metal plate or an insulating plate 45, safety during assembly and maintenance is increased.

According to the second embodiment of the present invention, the operating shaft 40 connected to the interrupting section operating device for driving the movable contact 38 of the current interrupting section 33 and the disconnection for driving the movable contact 41 of the disconnecting section 31. Operation shaft 4 connected to the head operation device
3 is a first metal container 44 placed on the support base 23.
And the instrument transformer, surge absorbing capacitor and lightning arrester housing provided under the support base 23,
Since the structure is divided by the partition member 45 made of a metal plate or an insulating plate, insulation between the operation shafts 40 and 43 and the cubicle component device can be ensured, and the degree of freedom in designing the arrangement and selection of the cubicle component device is increased. And a main circuit switchgear capable of improving safety during assembly and maintenance.

Embodiment 3 Third Embodiment A third embodiment according to the present invention will be described with reference to FIG. FIG. 5 is a side view showing the configuration of the power generating main circuit switching device according to the third embodiment. The third embodiment has the same general configuration as the first embodiment shown in FIGS. 1 to 3 except for the specific configuration described in the third embodiment. In the figure, 18 is an instrument transformer, 19 is a surge absorbing capacitor, 20 is a lightning arrestor, 24 is a second metal container, 31 is a disconnecting section, 32 is a second bushing, 33 is a cutoff section, and 34 is a first section. Bushing, 35 is a disconnector side cubicle component mounting plate, 36
Is a circuit breaker side component mounting plate, 44 is a first metal container, and 46 is a partition member made of a metal plate or an insulating plate.

As shown in FIG. 5, the instrument transformer 18 connected from the current interrupting section 33 via the bushing 34 and the instrument transformer 18 connected from the voltage disconnecting section 31 via the bushing 32, the surge absorber The capacitor 19 and the lightning arrester 20 are made of a partition member 4 made of a metal plate or an insulating plate.
By having the structure partitioned by 6, even if one is charged, the other can be safely maintained.

According to the third embodiment of the present invention, the instrument transformer 18 connected from the current interrupting section via the bushing 34 and the instrument transformer 18 connected from the voltage disconnecting section via the bushing 32. , The surge absorbing capacitor 19 and the lightning arrester 20 have a structure partitioned by the partition member 46, so that safety during maintenance can be improved.

As described above, according to the embodiment of the present invention, since the legs of the support gantry are arranged in the interphase, it is possible to unitize the cubicle component devices installed in the second metal container. Thus, the maintainability and workability are improved. Further, since the work can be performed from the main circuit axial direction 28, the dead space can be effectively used, and the installation area including the maintenance space can be reduced. In addition, by arranging the operation shafts of the blocking unit and the disconnecting unit in a central part between the first metal container and the second metal container, the degree of freedom in the arrangement of the cubicle components increases. Furthermore, by providing a partition between the instrument transformer electrically connected to the disconnecting section, the surge absorbing capacitor or the surge arrester and the instrument transformer electrically connected to the cutoff section, one is charged. The other can be safely maintained while it is running. Therefore, it is possible to obtain a main circuit opening / closing device in which the installation space can be reduced as compared with the related art, and the assembly, maintenance, and inspection are easy.

[0029]

According to the first aspect of the present invention, it is possible to obtain a main circuit opening / closing device capable of appropriately reducing the installation space while appropriately securing workability during assembly and maintenance.

According to the second aspect of the present invention, it is possible to obtain a main circuit opening / closing device capable of appropriately reducing installation space while ensuring more appropriate workability during assembly and maintenance.

According to the third aspect of the present invention, it is possible to appropriately reduce the installation space while appropriately ensuring workability during assembly and maintenance, and to increase the degree of design freedom in arranging cubicle components and selecting the components. It is possible to obtain a main circuit opening / closing device capable of improving safety during maintenance.

According to the fourth aspect of the present invention, it is possible to obtain a main circuit opening / closing device capable of appropriately reducing the installation space while appropriately ensuring workability during assembly and maintenance and improving safety during maintenance. .

According to the fifth aspect of the present invention, there is provided a main circuit opening / closing device capable of appropriately reducing an installation space while appropriately ensuring workability during assembly and maintenance, and reliably improving safety during maintenance. Can be.

[Brief description of the drawings]

FIG. 1 is a front view showing a device configuration of a power generating main circuit switching device according to a first embodiment of the present invention.

FIG. 2 is a side view showing details of a power generation main circuit switching device according to the first embodiment of the present invention.

FIG. 3 is a side view showing a maintenance space according to the first embodiment of the present invention.

FIG. 4 is a side view showing a configuration of a power generating main circuit switching device according to Embodiment 2 of the present invention.

FIG. 5 is a side view showing a configuration of a power generating main circuit switching device according to Embodiment 3 of the present invention.

FIG. 6 is a single-line diagram in the case of a high-pressure synchronous system of a power plant.

FIG. 7 is a single-line diagram in the case of a low-pressure synchronous system of a power plant.

FIG. 8 is a single-line diagram showing an electrical connection of a power generation main circuit switching device according to the related art.

FIG. 9 is a single-line diagram showing the electrical connection of the power generation main circuit switching device integrated with the cubicle.

FIG. 10 is a side view showing a configuration of a conventional power generation main circuit switching device and a maintenance space.

[Explanation of symbols]

1 generator, 2 main transformers, 3 station transformers, 4 starting transformers, 5, 6, 7, 8 breakers, 9 buses, 10, 1
1 transmission line, 12 main circuit switchgear, 13 circuit breaker, 14
Disconnector, 15 Breaker-side grounding device, 16 Disconnector-side grounding device, 17 Current transformer for instrument, 18 Transformer for instrument, 1
Reference Signs List 9 Surge absorbing capacitor, 20 surge arrester, 21 disconnection side cubicle component equipment, 22 interrupting part side cubicle component equipment, 23 support stand, 23a legs of support stand, 24 second metal container, 25 interphase direction, 26 end phase Maintenance direction from outside, 27: Interphase, 28
Conductor axial direction, 29 phase separation busbar, 30 Conductor axial direction maintenance space, 31 disconnection part, 32 second bushing, 33 interrupting part, 34 first bushing, 35
Disconnector-side cubicle component mounting plate, 36 Circuit breaker-side cubicle component mounting plate, 37 Cubicle component unit, 38 Breaker movable contact, 39 Breaker operating device, 40 Breaker operating shaft, 41 Disconnector movable contact , 42 disconnecting section operating device, 43 disconnecting section operating shaft, 44
1st metal container, 45 operation axis partition, 46 cubicle component partition, 47 end phase outside maintenance space.

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masafumi Matsuki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 5G017 AA23 BB15 JJ02

Claims (5)

[Claims] A first metal container provided in each phase for accommodating a main circuit interrupting portion and a disconnecting portion which are arranged extending in the axial direction of the bus conductor and electrically connected to each other, and a leg portion; A supporting frame for mounting the first metal container on a supported frame, an instrument transformer connected to the interrupting portion via a bushing immediately below the bus conductor in an axial direction, and the bus bar to the disconnecting portion; A second metal container that houses an instrument transformer, a surge absorbing capacitor, and a lightning arrester that is connected via a bushing immediately below the conductor in an axial direction, and that is provided at a lower portion of the support base; The main circuit switchgear, characterized in that the main circuit switching device is disposed other than immediately below the center in the conductor axial direction. 2. A first metal container which is provided for each phase for accommodating a main circuit interrupting portion and a disconnecting portion which extend in the axial direction of the bus conductor and which are electrically connected to each other, and a leg portion. A supporting frame for mounting the first metal container on a supported frame, an instrument transformer connected to the interrupting portion via a bushing immediately below the bus conductor in an axial direction, and the bus bar to the disconnecting portion; A second metal container that houses an instrument transformer, a surge absorbing capacitor, and a lightning arrester that is connected via a bushing immediately below the conductor in an axial direction, and that is provided at a lower portion of the support base; The main circuit switchgear, wherein are arranged between the phases. 3. An instrument transformer connected from the disconnecting section and an instrument transformer, a surge absorbing capacitor, and a surge arrester connected from the disconnecting section are formed as a unit by being respectively attached to an attaching member. The power generating main circuit switching device according to claim 1 or 2, characterized in that: 4. An operating shaft connected to an interrupting section operating device for driving a movable contact of a current interrupting section and an operating shaft connected to a disconnecting section operating device for driving a movable contact of a disconnecting section are provided on an upper portion of the support base. It is characterized in that it is integrated between the mounted first metal container and an instrument transformer, a surge absorbing capacitor, and a lightning arrester housing section provided at a lower portion of the support base, and has a structure partitioned by a partition member. The main circuit switchgear according to claim 1 or 2, wherein the main circuit switchgear. 5. An instrumentation transformer connected from a voltage cut-off section via a bushing, and an instrumentation transformer, a surge absorbing capacitor, and a surge arrester connected from a voltage disconnection section via a bushing are formed by partition members. The main circuit switchgear according to claim 1 or 2, wherein the main circuit switchgear has a partitioned structure.