JPS58114407A - External connection device of three-phase transformer - Google Patents

Abstract

PURPOSE:To minimize the installation space by a method wherein, when constituting a three-phase transformer by arranging three or more of single phase transformers, and leading out high pressure side terminals from the transformer side surface and medium pressure side terminals from the transformer upper surface resulting in connection to three-phase gas insulation bus, the gas insulation arrester of every phase, on the high pressure side, is in the direction of side installation of the singlephase transformer and in parallel with the ground, and, on the medium pressure side, is vertical to the ground. CONSTITUTION:The content of the unit transformer is contained into a tank 2 and transported by the unit of (a)-(f), and (a) and (b), (c) and (d), and (e) and (f) are connected each other resulting in each constitution of the single phase transformer of U, V, and W phases. Next, from the side surface of the unit transformers (a), (c), and (e), high pressure terminals are led out via a duct 3 and a wall-through bushing 5, and thus the gas insulation bus is constituted of the duct 7 for gas and a conductor 9. While being made parallel with the ground, cases 11 with built-in gas insulation arresters 13 from the halfway thereof are arranged in the direction of transformers (a)-(f). From the transformer upper surface, medium pressure terminals are led out in the same manner, and cases 12 with built-in arresters thereof 14 are formed vertical to the ground.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention is a split-type three-phase transformer used in ultra-high voltage power transmission systems such as 500 kV and IoOo KV, in which the high voltage side and the medium voltage side are separated for each phase. This invention relates to an external connection device for a three-phase transformer configured with a gas-insulated bus bar.

BACKGROUND ART OF THE INVENTION With the increase in demand for electric power in recent years, 500 kV class ultra-high voltage power transmission has been realized, and furthermore, 10 D OkV class power transmission is being implemented.

As is well known, the transformers installed at substations for ultra-high voltage power transmission are made by combining multiple single-phase transformers and connecting them to three-phase connections to create a three-phase puncture configuration due to various transportation restrictions and transformers. Necessary for capacity increase. On the other hand, as there is a strong demand to reduce installation space and importance is placed on aesthetic appearance, more and more cases are being adopted where gas-insulated busbars are used to connect transformers and switchgear in power generation and substations. . In particular, compact gas-insulated arresters are being adopted in place of conventional air-installed arresters.

Object of the invention Object of the invention To minimize the installation space of a three-phase transformer with a gas-insulated busbar and a gas-insulated arrester,
The object of the present invention is to obtain an external connection device for three-phase transformers that improves the layout of power stations and substations.

Embodiments of the invention will be described below with reference to the drawings. FIG. 1 is a plan view of an external connection device for a three-phase transformer according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a view taken along the arrow 1 in FIG.

The contents 1 of the unit transformer are stored in a tank 2 and transported in units of 0) to (to) (a) (b), e→to), and ni) (to) to each other 1i! ! These are connected to each other to form a single-phase transformer of U, V, and W phases. (A) A high-voltage terminal is drawn out from the side of the unit transformer in (Uni) using a duct 1 and a through-wall bushing 5, and a gas insulated bus bar is formed by a gas duct 7 and a conductor 9, and a gas insulated arrester 11 [A built-in case 11 is provided parallel to the ground and curved in the direction in which the unit transformers (a) to (f) are arranged, and branched and connected inside the gas duct 1.

Similarly, a medium voltage terminal is drawn out from the top surface of the unit transformer through a duct 4 and a through-wall plug 6, and a gas insulated bus bar is formed by the gas duct 1 and the conductor 10, and from the middle of the line, a direction immediately below the gas insulated bus duct is drawn out. A case 12 containing a gas insulating presser 14 is provided, and is branched and connected inside the gas duct 8. With this configuration, the gas insulated bus bars are stacked in three tiers perpendicular to the ground at the same position on the plan view, and as shown in the side view, the gas insulated bus bars are stacked one after another on the same plane with grooves. They are arranged so that they do not interfere with each other. In addition, duct 3 is shown in the drawing.
4. Supporting materials for the busbar ducts 1 and 8 and supporting materials for the arrester case 11 and 12 are omitted), but if a soundproof tank 15 is attached, these may be supported from the same.

In addition, illustrations of the neutral point, tertiary side pump, and tank are also omitted.

With this configuration, the gas-insulated arrester is wired closest to the transformer to be protected, so its functionality can be maximized. In addition, it is possible to minimize the installation space of the transformer by attaching a gas insulated arrester.Especially when the high voltage side is 1000 kV class, the duct 1 for gas insulated bus bar and cous 11 for gas insulated arrester 13 are included. Considering that the land area including the supporting material (with an outer diameter of about 1000 to 1500 cm) is increasing, the economic effect of this configuration is extremely large. Furthermore, the gas insulated bus duct and the gas insulated arrester can be supported by the transformer tank 1 or the soundproof tank 15, etc., thereby facilitating earthquake-resistant design. Moreover, since the gas-insulated busbar is constructed in a straight line, multiple three-phase transformers can be supervised for power generation.

Even when trying to increase the power transmission capacity of a substation, the layout becomes very difficult.

In addition, in the event that a transformer malfunctions and we are forced to remove it,
The high and medium voltage gas insulated busbars are concentrated on one side of the transformer, making it easy to carry out the work.

Figures 4 to 6 show other embodiments of Figures 1 to 3, in which the gas insulated arrester on the high pressure side is arranged parallel to the lower part of the high pressure through-wall bushing that is arranged horizontally. The same effect as described above can be obtained.

In addition, Fig. 1 shows the case where unit transformers 0) to (to) each constitute a single-phase transformer, but this unit transformer is 1
Even if a single-phase transformer is configured with one or three or more units, the effect will not change. However, the functions and effects described above are the same.A method is adopted in which a through-wall spacer is placed at the connection between the gas-insulated arrester and the gas-insulated bus to separate the gas from the gas-insulated arrester and the gas-insulated bus. Of course, this does not result in any loss of functionality or effectiveness.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, although the gas insulated arrester is built into the main body, the installation space for the transformer is minimized, and the transformer is highly reliable and inexpensive. An external connection device for a three-phase transformer can be obtained.

[Brief explanation of drawings]

Fig. 1 Hiro is a plan view showing the external connection device of a three-phase transformer according to an embodiment of the present invention, Fig. 2 is a side view of the first wic, and Fig. 3 is a diagram showing "A'-"A of Fig. 1. Fig. 4 is a plan view showing another embodiment of the present invention, Fig. 5 is a side view of Fig. 4, and Fig. 6 is a view taken from “B”-@Bm in Fig. 4.・ 1... Contents of unit transformer, 2... Unit transformer tank,
J... High pressure side wall through bushing duct, 4... Medium pressure side wall through bushing duct, 6... High pressure side wall through bushing, 6... Medium pressure side wall through bushing, 7... High pressure side gas duct, 8... Medium pressure side gas duct, 9... High pressure side bus conductor, 10... Medium voltage side bus conductor, 11... High pressure side gas insulated arrester case, 12... Medium pressure 11 gas insulated arrester, -Case, 13... High pressure side gas disconnection l
l Arrester 14... Medium pressure side gas insulated arrester, 1
5...Soundproof tank. Applicant's agent Patent attorney Takehiko Suzue Engraving of drawings (
No change in content) Figure 1 @2m '/”' wvu λ” 1 1. 14 (a) 1 \, -7~zu
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Ma (4N, , I 1 12ゝ-1 1 day " 1 11 1 ゝ\ 1 \, \ ()\n (ni) 11 1 1 1 1 -ノ (, \ (ho)
ゝ ゝ] ;V Figure 5 Figure 15 Procedural amendment dated 39/5/1939 Shima, Commissioner of the Patent Office 1) Haruki Tono1, Indication of the case Patent application No. 1983-2136142, Title of the invention 3 External connection device of phase transformer 3, relationship with amendment case Patent applicant (307) JK Kyoshibaura Electric Co., Ltd. 4, agent

Claims (1)

[Claims] A three-phase transformer is constructed by arranging at least three single-phase transformers connected to other switchgears via gas-insulated busbars in which the high-voltage side and medium-voltage side are separated into each phase, and the high-voltage side of the transformer is connected to another switchgear. In a system where a three-phase gas insulated bus bar is installed by pulling out the terminals from between the transformer sides and pulling out the medium voltage side terminals from above the transformer, the gas insulated arrester for each phase is installed on the high voltage side on the same level as that of a single phase transformer. An external connection device for a three-phase transformer, characterized in that it is placed horizontally to the ground in the installation direction, and the medium voltage side is placed perpendicular to the ground.