JPS58138012A - External connecting device of three-phase transformer - Google Patents

Abstract

PURPOSE:To minimize installation space and improve layout of a power plant or substation, by a method wherein at least one group of gas insulation bus bars at high voltage side and medium voltage side are disposed on upper side of single- phase transformers to constitute a three-phase transformer. CONSTITUTION:High-voltage terminals are formed respectively on upper side of single-phase transformers 10A-10C at the same level and connected to high- voltage gas insulation bus bars 11A-11C disposed in the direction of single- phase transformers in parallel arrangement. Medium-voltage terminals are formed on upper side of the single-phase transformers at the same level and in the reverse direction to respective high-voltage gas insulation bus bars and connected to medium-voltage gas insulation bus bars 12A-12C disposed in the direction of the single-phase transformers in parallel arrangement. Thus high-voltage gas insulation bus bars and medium-voltage gas insulation bus bars disposed on upper side of single-phase transformers are connected to respective switching devices. In this constitution, installation space for gas insulation bus bars at high voltage side and medium voltage side is not required, but space for each single- phase transformer itself will do, thereby the limited area for the substation can be utilized effectively.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a split-type three-phase transformer used in ultra-super high voltage power transmission systems such as The present invention relates to an external connection device consisting of a gas insulated bus bar whose pressure side is separated from each phase.

[Technical background of the invention]

With the increase in demand for electricity in recent years, ultra-ultra-high-voltage power transmission of 500 mm class has been realized, and even 1000 mm class power transmission is being implemented.

As is well known, in the case of transformers installed in such ultra-high-voltage power generation and substations, it is necessary to combine multiple single-phase transformers and perform three-phase wiring to create a three-phase puncture configuration due to various transportation restrictions. and is required to increase the transformer capacity.

On the other hand, as there is a strong demand for smaller installation space and more emphasis is placed on aesthetic appearance, the method of connecting transformers and switchgear in power generation and substations with gas-insulated busbars is increasingly being adopted. ing.

Figure 81 (b) is a plan view and side view showing the arrangement of the three-phase transformer and gas insulated bus bar in such a conventional substation. JOB to three single-phase transformers 10.

10C are arranged in parallel at appropriate intervals to form a three-phase transformer. A high-voltage side terminal consisting of a lashing and a gas duct to which a lead (not shown) is connected is exposed from one side corresponding to the direction in which each of the single-phase transformers 10A to 10C is arranged in parallel. The transformers 10A to 10C are connected to high-voltage side gas insulated busbars 11 which are arranged side by side in the longitudinal direction of the tanks of the transformers 10A to ZOC along the side-by-side direction in which the single-phase transformers 101 to 10C are arranged side by side. . Further, medium voltage side terminals consisting of bushings and gas ducts to which leads (not shown) are connected are led out from the top surface of each single phase transformer JOA to IOC, and these medium voltage side terminals are connected to each single phase transformer 10.
1 to each single-phase transformer 10 on the other side in the longitudinal direction of the tank of IOC.
Intermediate voltage side gas insulated buses 12A to 120i are connected along the direction in which the high voltage side gas insulated buses JJA to IOC are arranged in parallel and in the direction opposite to the direction in which the high voltage side gas insulated buses JJA to IIC are led out;

High-voltage side gas insulated bus bars 11) L to xlC arranged on the longitudinal side of the tank of each single-phase transformer JOA to IOC, and medium voltage side gas insulated bus bar 12 arranged on the other side in the longitudinal direction of the tank. 12C is connected to a switching device not shown here.

[Problems with background technology]

In such a conventional arrangement, each single-phase transformer 101 to 1
0C, high voltage gas insulated bus 11, ~11C, and medium voltage gas insulated bus J2A ~ 12C are arranged in a plane, and a large space is required especially for buses of ultra-super high voltage class or above. Therefore, it was uneconomical.

[Purpose of the invention]

The purpose of the present invention is to provide an external connection device for a three-phase transformer having a gas-insulated busbar, which can minimize the installation space and improve the layout of power generation and substations. is to provide.

[Summary of the invention]

In order to achieve such an object, in the present invention, at least three or more single-phase transformers (v) connected to other switchgears (1) via a gas-insulated bus bar with each phase separated on at least the high-voltage side and the intermediate-voltage side (3-phase transformers) In this configuration, at least one of the gas-insulated busbar groups on the high-voltage side and the intermediate-voltage side is disposed above each of the single-phase transformers.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
Figures (a) and (b) are a plan view and a side view showing an example of the arrangement of a three-phase transformer and a gas-insulated busbar.
I (The same parts as bl will be described with the same symbols.

Figure 2 (withstanding, (bH: three single-phase transformers 101
~IOCs are arranged in parallel at appropriate intervals to form a three-phase transformer. A high-voltage side terminal consisting of a through-wall bushing and a duct to which a lead (not shown) is connected is led out from one side corresponding to the direction in which each single-phase transformer 101 to IOC is arranged in parallel, and each of these high-voltage side terminals is connected to each single-phase transformer. Upper C of transformer JOA~70C: High voltage side insulated bus J
JA~llCl' knee is connected. In this case, the high voltage side terminal connected to the high voltage side gas insulated bus JJA is led to the vicinity of one end of the single phase transformer 10 along the longitudinal direction of the tank. It stands up more vertically.

In addition, the high voltage side terminal connected to the high voltage side gas insulated bus JIB is led along the longitudinal direction of the tank of the single phase transformer JOB to the front of the high voltage side terminal connected to the high voltage side gas insulated bus 11A. .

Therefore, the high voltage side gas insulated bus bar 11 is raised perpendicularly therefrom. Furthermore, the high voltage side is the insulated bus bar 11C.
The high-voltage terminal connected to the single-phase transformer 10C is led toward the side of the single-phase transformer 10C (in the direction of the island), and therefore the high-voltage side gas insulated bus 11C is raised perpendicularly from this.

In addition, medium voltage side terminals consisting of wall bushings and ducts to which leads (not shown) are connected are led out from the top surface of each single phase transformer JOA to IOC, and these medium voltage side terminals are connected to each single phase transformer 101 to 10C. At the top, medium voltage side gas insulated buses 12A to JjC are arranged in the direction in which the single phase transformers JOA to XOC are arranged in parallel, in opposite directions and at the same height as the above-mentioned high voltage side gas insulated buses JJA to IIC. (: connected. In this case, the intermediate voltage side terminals connected to each intermediate voltage side gas insulated bus bar izh to ixc are vertically raised from the top surface of each single phase transformer. From that position, the pressure side gas insulated bus 12 is guided, and the intermediate voltage side gas insulated buses 11B and IIC are led to the other end in the longitudinal direction of the tanks of the single phase transformers JOB and IOC, and are bent at right angles therefrom.

In this way, the high voltage side gas insulated buses @11A to IIC and the intermediate voltage side gas insulated buses JjA to 12C disposed above each single phase transformer JOA to IOC are connected to respective switching devices (not shown).

If the arrangement is as above, the installation space will be the high pressure side and medium pressure side gas insulated buses 111 to IIC and Jj.
Does not require space to install A to 1, 2C,
Since the installation space for each single-phase transformer 101 to IOC itself is sufficient, the limited area of the substation can be used effectively. This is particularly effective when the diameter of the gas insulated busbar is large and the pressure is extremely high or higher. In addition, since it is possible to minimize the connection length between each high voltage side terminal and each high voltage side gas insulated bus bar 11^~lIC1 and each middle overpowered terminal and medium voltage side gas insulated bus bar 12A~12C, the reliability of the gas insulated bus bar is improved. do.

In the above embodiment, the high voltage side terminal is connected to each single phase transformer 70A.
Although we have described the case where the high voltage side terminals are led out from one side surface corresponding to the direction in which the IOCs are arranged in parallel and connected to the high voltage side gas insulated bus bars 111L to 11C, there is a case where the high voltage side terminals are led out from the top surface of each single phase transformer 101 to ZOC. , Conversely, when the intermediate voltage side terminals are pulled out from one side of each single-phase transformer 101 to IOC, the high voltage side gas insulated buses 11mu to IIC and the intermediate voltage side gas insulated buses 7jA to 11C & each single phase are connected in the same manner as described above. transformer J
Connection is possible even if it is disposed above the OA to IOC. Further, in the above embodiment, the high voltage side gas insulated buses 111 to 11C and the intermediate voltage side gas insulated buses 121 to IIC are connected to each single phase transformer 10.
We have described the case in which they are installed in parallel above the IOCs at the same height, but as shown in Figures W&3, the intermediate voltage side gas insulated bus lines Jl, A~ are placed above the high voltage side gas insulated bus lines 1#A~xjc.
A two-stage structure may be used in which the high voltage side gas insulated buses iih to 1C1 and the intermediate voltage side gas insulated buses 12A to 12C are arranged in a triangular configuration as shown in FIG.

Furthermore, in the above embodiment, the high voltage side gas insulated buses 11A to 11C and the medium voltage side gas insulated buses JJA to 12C are arranged above each single phase transformer 101 to 10C.
As shown in Figure 85 (a) and (b), the medium voltage side gas insulated buses 12A to 1zc are arranged above each single phase transformer 10A to IOC, and the high voltage side gas insulated buses 11A to IIC are arranged above each single phase transformer 10A to IOC. It may be arranged on one side of the transformer 101 to IOC in the longitudinal direction of the tank.

Even in this case, the installation space can be reduced compared to the conventional ones shown in FIGS. 1(a) and 1(b). In addition, Figure 2 (a), (b) and Figure 115 (a)
, In the embodiment shown in (b), the high voltage side is the insulated bus bar 111.
~11C and the intermediate voltage side gas insulated busbars 1.jA~12C are projected in opposite directions, but they may be projected in the same direction.

〔Effect of the invention〕

As described above, according to the present invention, at least one of the gas-insulated busbar groups on the high-voltage side and the medium-voltage side is arranged above each single-phase transformer constituting a three-phase transformer, so that the installation space is reduced. It is possible to provide an external connection device for a three-phase transformer that can improve the layout of power generation and substations by minimizing the amount of noise.

[Brief explanation of drawings]

! 1!1 Figures (a) * (b) are plan and side views showing the arrangement of a conventional three-phase transformer and gas-insulated busbar, I! 2
Figures (at, (bt) are a plan view and a side view showing one embodiment of the present invention, Figures 3 and 4 are side views showing a modified example of the arrangement of the gas insulated bus bar, Figure 15 (a) # ( b) is a plan view and a side view showing other embodiments of the present invention.
JC...Medium pressure side gas insulated bus bar. 1 representative Patent attorney Suzue Takehiko 111 Il Ca) 1211 (a) (b) Figure 3 Figure 4 Figure 5 (a)

Claims (1)

[Claims] In a three-phase transformer configured by lining up three or more single-phase transformers connected to other switchgear via a gas-insulated bus bar with at least the high-voltage side and the medium-voltage side separated into each phase, the high-voltage side and the low-voltage side An external connection device for a three-phase transformer, characterized in that at least one of the gas-insulated busbars is disposed above each of the single-phase transformers.