JPS58131713A - Exterior connector for three-phase transformer - Google Patents

Abstract

PURPOSE:To contrive to reduce the installing space and to improve the external apprearance of the three-phase transformers by a method wherein gas insulated bus-bars to be connected to the respective single-phase transformers are arranged in the earth at the position between the respective mutually adjoining three- phase transformers. CONSTITUTION:The gas insulated bus-bars 8A-8C, 9A-9C, 10A-10C, 11A- 11C to be connected to the respective single-phase transformers 1A-1C, 2A-2C are arranged in space between the adjoiningly arranged three-phase transformers 1, 2, and the gas insulated bus-bars thereof are extended in straight lines to be connected to switchgears. Accordingly the gas insulated bus-bars can be collected in one place being enabled to arrange in small space utilizing space between the three-phase transformers 1, 2 effectively. Moreover because the gas insulated bus-bars 8A-8C...11A-11C are arranged inside of a pit 5 provided in the earth G, bus-bar installing space on the surface of ground can be made unnecessary.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a split lid three-phase transformer connected to an ultra-high voltage power transmission system, in which the high voltage side and voltage side of each unit transformer are connected to switchgear. Regarding external connection devices.

[The technical background of the invention]

With the increase in electricity demand in recent years, ultra-high voltage of 500 kV (
Hereinafter referred to as UHV. ) power transmission is Ill and further 10
Plans for 0OV-class ultra-high voltage power transmission are also underway. The transformers installed in power plants and substations for 500 kV or 200 kV class power transmission are a combination of three single-phase transformers, which are constructed by installing multiple unit transformers in parallel. As a split-type transformer with a 3-phase/4-link configuration, we aim to increase the transformer capacity to cope with dimensional restrictions during transportation.

9. The busbar, which is an external connection device that connects the ultra-high voltage split three-phase transformer and the switchgear in power generation and substations, is large, so in order to reduce its size, each single phase of the transformer is A configuration is being considered in which the high-voltage side and intermediate-voltage side of a transformer are connected to a gas-insulated switchgear using a gas-insulated bus bar as an external connection device.

[Problems with background technology]

Recently, however, in order to secure passageway space for several people, e.g. 4115, to disperse and inspect at power stations and substations, installation spaces for busbars that connect transformers installed at power stations and substations with switchgear have been introduced. (There is a strong demand to reduce the -J8!I! Similarly, when connecting with insulated busbars, there is a need to reduce the busbar installation space and improve the appearance.In addition, in power generation and substations, multiple Gunku's three-phase transformers are often installed side by side, and the above requirements are expected to be met even when installing f-ss/Me lines that connect these three-phase transformers to single-phase transformers. There is.

The present invention provides an external connection device for a three-phase transformer that reduces the installation space and improves the appearance when installing a gas-insulated bus bar that connects the phase transformer to a switchgear.

[Outline of invention cost]

The external connection j4rfffi of the three-phase transformer of the present invention is a gas connection connected to each single-phase transformer Wlf in 2 of these three-phase transformers at 1F.j located at +i of each three-phase transformer adjacent to the fifth. By installing an insulated bus bar, fJ! is used for each three-phase transformer. The number of gas insulations can be placed at one location, reducing the required space.Furthermore, it is possible to bury the gas insulated busbar underground or to house it inside a pit provided underground. This eliminates the need for space for installing the B-line on the ground, and raises the outside of the installation without exposing the gas-insulated #& bus bar above the ground.

[Embodiments of the invention]

Outer 1jjI connection device of the three-phase transformer of the present invention! An example of a village on stripes 1 to 3! To open fire. This embodiment is applied to a case where two sets of two-phase pottery are placed adjacent to each other.

In the figure, 1 indicates three single-phase transformers 1 that are constructed by combining multiple unit transformers, and one three-phase transformer has an IB and IC installed in parallel to form a three-phase Δ link configuration, and 2 indicates multiple unit transformers. The other three-phase transformer is a three-phase flat configuration in which three sub-voltage djA, 2B, JC~ constructed by combining unit transformers are arranged in parallel.

These three-phase transformers J and 2 are arranged adjacent to each other with a predetermined space, and the single-phase transformers 7A to IC of each three-phase transformer 1.2 and the single-phase transformer 2A ~2C are arranged in parallel so as to face each female. In the switchgear field set on one side (for example, on the right side in the figure) of the transformer field where the three-phase transformer 1.2 is installed,
Each single phase transformer! A number of gas insulated FA closing devices (not shown) on the high pressure side corresponding to A to IC and 21 to 2C are provided. In the switchgear field set on the other side of the transformer field (for example, on the left side in the figure), each single-phase transformer IA~
A number of gas insulated switching devices f (not shown) on the intermediate pressure side are provided corresponding to the ICs and 21 to 2C. three phase transformer 1
and the three-phase transformer 2, that is, the single-phase transformer IA
~7C and single-phase transformer jA ~ 2C, and on both left and right sides of three-phase transformer 1.2 - FF side opening t1 device g and medium voltage side sentry device were installed respectively. There is a pit 5 horizontally 1-1 in the underground G between the
It is provided on line 11-J. The pit 5 is, for example, in the shape of a groove whose upper part is open in the ground.

Furthermore, each single phase transformer IE&41A, ~IC has a high voltage side drawer section 6 and a medium voltage side drawer section 7, and each single phase transformer 2A~2C
Are the high-pressure side drawer section 6 and the medium-pressure side drawer section 7 each single-phase?
(It is provided between the pressure vessels IA to IC and 2A to 2C, that is, so as to protrude toward the top of the pit 5. These valley drawer portions 6.7 are constituted by, for example, an oil-gas bushing PC. Each single phase transformer 7A-7C.

The low pressure side 1 outlet portions 2A to 2C are omitted in the figure.

Also, inside the pit 5, there are six single-phase transformers IA-IC,
Gas insulation t0θA on the high-voltage side extends from between 2A to 2C to the high-voltage side @4 at the location of the closing device W on one side of the three-phase transformer 1.2. ,,8
B, EC and 9A.

9B and 9C are set up. These Pis Zettaku Mother @81
~8C is an external connection device, one end of which is connected to the high-voltage side drawer portion 6 of unit transformer IA to IC in three-phase transformer 1, and the other end connected to single-phase transformer IA to IB.
The gas insulated bus bars #A to 9C are connected to the high voltage side switchgear corresponding to the high voltage side switchgear corresponding to the three phase transformer 2, and one end of the gas insulated bus bars #A to 9C is connected to the high voltage side drawer part 6 of the single phase transformer 2A to 2C in the three phase transformer 2. , the other end is connected to high voltage side switchgear +1 corresponding to single phase transformers 2A to 2C.

Explanation will be added regarding the arrangement of the gas insulated buses 8A to 8C and 91 to 9C. As shown in Fig. 2, single-phase transformer IA
-Gas insulated busbars 8A to 8C connected to the IC are arranged horizontally in three rows in parallel inside the pit 5,
Single phase transformer 2A~2 CVC connected gas insulated motherboard a9A
-9C are located, for example, above the rows of gas insulated busbars 8A-8C, and are arranged inside the pit 5 in parallel with the horizontal row C3. That is, gas insulating motherboard 11#A to JC
, 9A to 9C are arranged in the horizontal direction for each three-phase transformer 1.degree.2, and the I/L of the valley gas insulated bus bars arranged in the horizontal direction are arranged vertically. The high voltage 11111 lead-out portions 6 and 7 of the six single-phase transformers IA to IC and 21 to 2C are connected at different positions depending on the arrangement of the gas insulated busbars 8A to 8C and 9A to 9C. Also, pi,
Inside the case 5, there are single-phase transformers 57A to IC.

Gas-insulated busbars 10A, JOB, 10 on the Ichikawa side extend linearly in the horizontal direction from between 2A to 2C to the location where the medium-voltage side pull-out portion 1a is located on the other side of the three-phase transformers 1 and 2.
C and 11A.

JIB and IJC are established. These gas insulated busbars 1
01~IOC has one end as external connection port 1a with unit transformer trt I A = I C medium pressure 9tli drawer part 7
In addition, the 11j4 end is connected to the core 1μ11 curved device for the single-phase transformers 7A to IB, and the gas insulated bus bars J7A to IIC are connected to the
One end is connected to the intermediate voltage 1 (1 drawer 7) of the phase transformers 2A to 2C, and the other end is connected to the single phase transformer 2A to 2C.
It is connected to the intermediate voltage side switching device corresponding to No. 20. Gas insulated i-1OA-I OC.

1) Add an explanation about the arrangement of A to JIC. Third
As shown in the figure, the gas insulated wires 10 and 10C connected to the single-phase transformers IA to JCK are arranged horizontally in three rows in parallel inside the pit 5, and the single-phase transformers 2A to 2A to
The gas insulated buses 111 to JIC connected to the gas insulated buses 111 to 2C are located, for example, on the upper side of the row of gas insulated buses 10A to 10C, and are arranged in three parallel rows inside the pit 5 in the horizontal direction. That is, gas insulated bus 101 to IOC, l No. A-J
One IC is arranged horizontally for every 1°2 of each three-phase transformer, and the rows of gas insulated busbars arranged horizontally are arranged in two stages, upper and lower. In addition, the intermediate voltage side drawer part 1 of ~2C is connected to each of the single-phase transformers IA to IC, 2 at different positions depending on the arrangement of the busbars 10A to IOC, 111 to IIC.

A gas-insulated bus bar has a bus conductor inserted inside a duct filled with insulating gas.

The upper open part of the pit 5 is closed with a force paddle 12 placed over the entire area, and this cup 4-1j allows the pit 5 to be closed.
The above can also be used, for example, as part of a passage, similar to the suseno on +tl+1ull.

According to such a configuration, the gas connected to each single-phase transformer 1 with 7C, 2A to 2C is connected to the dark space of the three-phase transformers 1 and 2 arranged in four Insulated busbar 8A~8C
, 9A to 9C, 70A to 10C, 111A to 11Ck, and these gas insulated busbars were connected linearly to the switchgear g via IJLJ+L, so that the
By effectively utilizing the bus, one gas e-line wire is stored in one place, and an IIL installation is performed using a small bus. Since it is installed inside the pit 5 provided in the underground G, a part of the busbar installation space on the ground is not required.Furthermore, the gas insulated busbars can be placed in one place with a minimum space, so the pit 5 can be made smaller. Therefore, the width of the 1, 1 line installation space at the power source and fd station can be reduced, and the width of the transformer field and switchgear It can be reduced without being constrained by the busbar installation space.
Passages for equipment loading, unloading, and inspection can be provided between the field and the field. In addition, the gas-insulated busbar is housed inside a pit installed underground, so that it is not exposed above the ground, so three-phase transformers 1 and 2 of the power generation and substation are installed, and the appearance of the location is It becomes smooth and the appearance improves.

Another embodiment of the invention will be described with reference to FIGS. 4 and 5. In this embodiment, in addition to the three-phase transformer @7゜2, single-phase transformers tA, 3B, and JC are installed in parallel to form a three-phase/re/reconfigured three-phase transformer 3, and a single-phase transformer 4A, 4B, 4
A three-phase transformer 4 is arranged adjacent to the three-phase transformer 4 which has a three-phase puncture configuration by arranging C in parallel, and the pit 5 is located between the three-phase transformers 1 and 2 and between the three-phase transformer 3.4. An underground GK is installed in a straight line from the center to the switchgear fields on both sides. f-s insulation that connects each single-phase transformer IA to IC12^ to 2C and switchgear in three-phase transformers 1 and 2 @81 to 8c/77A
-11CII are provided inside the pit 5 in the same arrangement as in the previous embodiment. There is a gas insulated bus bar 14 inside the bit 5 that connects the high voltage side drawer portion 6 of each single phase transformer 3A to 3C in the three phase transformer 3 to the high voltage side discrimination device.
14B, J4C and gas insulated busbars jjA, 15B, 15C connecting the high voltage side drawers s6 of each single phase transformer 44A to 4C in the three phase transformer 4 with the high voltage side switchgear are connected to the three phase transformer 3.4. It is installed in a straight line in the horizontal direction from the center to the switchgear field on one side. As shown in FIG. 5, gas insulated busbars 74A to 14C for single-phase transformers 3A to 3C
are arranged horizontally in three rows inside the pit 5 at the same height as the gas-insulated busbars 8A-8C for the single-phase transformers IA-IC, and the gas-insulated buses 8A-8C for the single-phase transformers 54A-4C. The upper @15ANj5c is a power supply connected to the upper side of the gas insulated bus bars 14A to 14C and distributed horizontally to the gas insulated upper fi19 for the single phase transformers 2A to 2C at the same height as ~9C and distributed inside the pit 5. be. In addition, inside the pit 5, a gas insulated bus bar 16 connecting the medium voltage side drawer part 7 of each single phase transformer 3A to 3C to the heavy voltage side switchgear t is connected to the gas insulated bus bar 16, 16B, 16C, and the single phase transformer 4A to 4c. Gas insulated bus bars 11m and 11B connect the intermediate voltage side drawer section r to the voltage side switchgear.

J7C is a straight line Kti in the horizontal direction from between the three-phase transformers 3 and 40 to the switchgear field on the other side.

-J6 to gas insulated bus 16 for single phase transformer, tA~sc
C are arranged in three rows in the horizontal direction and are arranged inside the pit 5 at the same height as the gas insulated busbars 10A to IOC for the single phase transformers IA to 1c. The insulated bus dXV~77C is stacked horizontally on top of the gas insulated bus 16~2c and is connected to the single phase transformer 2A~2c.
It is placed inside the pit 5 at the same height as the IIC on the gas insulation.

Another embodiment of the present invention will be described with reference to FIGS. 6 and 7. This embodiment consists of two sets of three-phase transformers: 1.
Setting 2 is suitable for nine cases. As shown in FIG.
Gas insulated motherboard connected to high pressure side drawer part 6 of 2C! I9-9C are arranged in parallel and arranged inside the pit 5 so as to be divided into three parts in a rectangular direction. That is,
The gas-insulated parts 7Hgh to 8C and 9A to 9C are arranged in the vertical direction for each three-phase transformer 1 and 2. Moreover, 10C is connected to the gas insulated bus bar 10 connected to the medium voltage side drawer part 7 of the single phase transformer JA-IC, and the single phase transformers 2A to 2
On the gas insulation connected to the medium pressure side drawer part 7 of C @ 71
A to IIC are arranged inside the pit 5 in parallel so that they are divided into three stages and lined up in one orthogonal direction. That is, gas insulated motherboard II 0A~10C111A~11c are each three-phase transformers! , 2 are grouped together and 11 are arranged in the self-direction.

FIGS. 8 and 9 show an arrangement in which four sets of three-phase transformers 1.2.3.4 are installed in a configuration in which gas-insulated busbars are arranged vertically. Single phase transformer I
A~IC, 111~2CK connecting gas insulation top #8A~
8C...111 to tpcLd have the arrangement shown in FIGS. 6 and 7. Then, as shown in FIG. 9, gas insulated buses J4A to 14 are connected to the high voltage side drawer portions 6 of the single phase transformers 3^ to 3c and the single phase transformers 4m to 4C.
C, J iA to 15C are provided inside the pit 5 by arranging the three-phase transformers 3 and 4, respectively, and arranging them in parallel in three stages in the vertical direction. Single phase transformer 3m~
3c and each medium-voltage side drawer part 1 of the single-phase transformers 4A to 4c.
The J'IC is divided into three stages vertically for each three-phase transformer 3 and 4 and arranged in parallel.
It is installed inside the.

In the present invention, the pit 5 is not limited to the groove-shaped pit 5 with an open top as in the embodiments described above, but a tunnel-shaped pit is provided in the underground G, and the gas insulated bus bar is housed in this tunnel-shaped pit. It may also be provided.

Furthermore, in the present invention, the gas insulated bus bar is not limited to being installed in the underground GK as in the above-mentioned embodiment, but the gas insulated bus bar may be buried in the underground GK. . FIG. 10 and FIG. 11 show an embodiment in which a gas insulated bus bar is buried underground. The arrangement of the gas insulated bus bars in this embodiment is the same as the arrangement 1 in Fig. 11 and Fig. 2.

In addition, in the case where the gas insulated bus bar is buried underground, the arrangement and configuration of the gas insulated bus bar can be set as desired.

〔Effect of the invention〕

The external connection device for a three-phase transformer of the present invention is a gas connection device for connecting each single-phase transformer to a switchgear in a plurality of sets of three-phase transformers formed by arranging single-phase transformers in parallel to form a three-phase puncture configuration. Insulated busbars are installed across the switchgear from locations located between each three-phase transformer adjacent to the tank, and these gas-insulated busbars are buried underground or inside a pit provided underground. In order to install the gas insulated busbars in a small space, it is possible to distribute the power to a small space (-s), and it is also possible to eliminate the need for a bus installation space on the ground. (It is possible to reduce space and secure space for passages, etc.) Moreover, since the gas-insulated busbar is underground and not exposed above ground, the appearance is improved without damaging the surrounding scenery.

[Brief explanation of drawings]

1 to 9 show embodiments of the present invention in which a gas insulated bus bar is provided inside a pit, respectively. FIG. 1 is a plan view showing one embodiment, and FIG. 3 is a sectional view along the line - ■, Figure 3 is a sectional view along the line - 1 in Figure 1,
FIG. 4 is a plan view showing another embodiment, and FIG. 5 is a plan view showing another embodiment.
6 is a plan view showing another different embodiment; FIG. 7 is a sectional view taken along FIG. 6-WImK; FIG. 8 is a plan view showing another different embodiment; Figure 9 is the 8th
Figure 4aKB is a cross-sectional view, Figures 10 and 11 each show an example in which the gas insulated bus bar is buried underground, Figure 1O is a plan view, and Figure 11 is Figure 10M- It is a sectional view along the M line. 1.2, 3.4... Three-phase transformer, lA to IC. 2A to 2C, 3A to JC, 4A to 4C... Single phase transformer, 5... Pit, 6... Pressure side drawer part, 7...
Medium pressure side drawer section, 8A to 8C, 9A to 9C. JOA~IOC, 111~IIC, 141~14C, 1
51-15C, 161N16C. 11m~77C...Gas insulated bus bar. Applicant's agent Patent attorney Takeshi Suzue 1 year old Figure 9 ILJ Ha Figure 10 Figure 11

Claims (1)

[Claims] Multiple sets of three-phase transformers are installed in which three single-phase transformers are arranged in parallel to form a three-phase configuration, and one of these three-phase transformers is placed between each adjacent three-phase transformer. A plurality of gas insulated busbars connected to the high voltage side drawer part and the low pressure side drawer part of each single phase transformer in the phase transformer are arranged side by side, and these gas insulated busbars a5 are connected to the switchgear and the gas insulated busbars are connected to the switchgear. An external connection device for a three-phase entrainer, characterized in that the busbar is installed in a ring underground, or if installed underground, it is housed inside a round pipe or hole◇