JPS59201617A - Contracted substation and its operating method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a downsized substation used in general industry and a method of operating the same.

[Background of the invention]

Generally, a two-line, two-bank system is widely used as an industrial power receiving system. FIG. 1 shows a typical skeleton thereof, and FIG. 2 shows a conventional example of this reduction and modification. The gas insulated switchgear unit (hereinafter referred to as GIS unit) 3.5, which is a reduced type switchgear, is a structure in which the part of the skeleton surrounded by the two-dot chain line in Fig. 1 is housed in a gas insulated container. . The GIS units 3 and 5 are provided with a pusher 8 for pulling in the power transmission line 2 held back to the holding iron 41. Between GIS 22-3 and 5,
MOF4, that is, an instrument transformer and a current transformer for measuring the amount of power used by the consumer, is connected and read. Gas insulated busbars 9, 1 are connected between GIS units 3, 4 and M%'OF4.
Connected to 0.

The transformers 6, 7 are connected to G by a gas-insulated busbar 11.1'2.
Connected to the IS unit.

In this way, a conventional gas-insulated substation consists of the detention tower 1, GI
It consists of S units 3, 5, IVIOF' unit 4, and transformers 6, 7, which are connected to each other by gas 7 insulated busbars 9-12.

However, in the case of such a system, for example, if the lead-in direction of the power transmission line is diagonal to the detention tower 1, the transmission tJ'
f. Since it becomes impossible to maintain an insulation interval between the phases of line 2, it is necessary to sufficiently widen the interval between the phases for holding the power transmission line in order to ensure a sufficient insulation interval. Therefore, the width direction of the detention tower 1 becomes large. For this reason, the 1dj distance between the GIS units 3 and 5 is widened, and the gas insulated buses 9 and 1 that connect them are roughly connected.
0 becomes long and becomes uneconomical.

Also, due to the housing complex, transformer 6.7 gold GIS unit 3
, 5, and the lifting platform is placed far away, and the gas insulators @11, 12 connecting between them become long, which is uneconomical.

Moreover, it takes more man-hours to design the gas-insulated bus bar each time, and the delivery time becomes longer.

Furthermore, because each machine was mechanically connected, the foundation concrete had to be made into a single piece, making it possible to achieve a high degree of precision in concrete construction.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a compact substation that is inexpensive and has good stability, as well as a single normal rotation method that is highly adaptable to abnormal situations in switchgear units. It is on offer.

[Overview of Bo Ming]

The present invention is characterized in that a cable is used in place of the gas four-color border matrix and embankment.

Generally, the capacity of an industrial power receiving substation is very small compared to that of an electric power company, and a voltage of 66 kV and 100 A is sufficient at most. If this is the case, the cable has an outer diameter of 5
However, by increasing the number of strands in the cable, it is possible to create a cable that is extremely flexible and easy to install. However, in 9≧, the cable head is also one that allows the cable to be freely attached and detached, so there is no need to drain the insulating gas or insulating oil from the equipment side when using the cable head. Such cables are very inexpensive compared to gas insulated busbars. Therefore, it is very effective for busbar systems that do not require branching.

Although the present invention is applicable to switchgear and transformers using insulating oil, SFe gas, or other media as the insulating medium, the following description will be made using a gas insulated switchgear using SF6 gas as an example.

[Embodiments of the invention]

The present invention will be explained below with reference to the % lamination shown in the drawings.

The delivery lines 2 and 20 sent by two lines are connected to the terminal tower 1.
It is supported by and connected to the upper terminal of the puller 8.

The F terminal of Puno/Ng 8 is connected to one end of Group 21, 22. The other ends of the cables 2, 22 are connected to the GIS units 3 and 5. GIS Unino l-3,
5 is connected via ~10F4, gas insulator for connection +ll! i! 9.

No. 10 has a short rib, so it is used in the same manner as in the conventional example.

At the other end of the GIS units 3 and 5, cables 23 and 24 are connected.
One end of the cable 23.24 is connected to the transformer 6.7. Although the illustration of each cable is simplified, the electrical connections are as shown in FIG.

Between cables 21 and 22 and GIS units 3 and 5, and between G
The connection structure between the IS units 3, 5 and the cables 23, 24, and between the cables 23, 24 and the transformers 6, 7 will be described with reference to FIGS. 5 and 6 as F. Since each connection configuration is the same, the connection between the GIS unit 3 and the cable 21 is now shown in FIG. 5R and FIG. 6.

The gas culm 25 is filled with SF and gas.

Mobility restriction 1 of cable 21 inserted through Henen Pilgrimage 26
The curse unit 27 is in a connected state with the fixed side connection unit 28. A gas tank and disconnector 30 having a sealed structure with an insulator 29 are connected to the cable 21 and the reciprocating conductor 24 via disconnectors DSI and DS2. Disconnector DS
A lightning arrester 31 is connected to the reciprocating conductor 241 of No. 2, and the cable 2 is connected to the 1 m end of the reciprocating conductor 24 via a disconnector DS3.
3 is being followed. The connection of this cable 23 also has the same structure as the cable 21 side.

The connection portion of the cable 21 will be explained using FIG. 6. G.I.
8 The gas insulating container 25 of the unit 3 is equipped with an epoxy insulating pipe 3.
2 is fixed. At the inner end of this epoxy insulator tube 32, there is a conductor 33 having a shield portion surrounding the connection portion.
is fixed υ, and the outer end is fixed to the container 250 seat 34. A movable side connection unit 27 is located on the atmosphere side of the seat 34.
are detachably attached. The movable side connection unit 27 has a cable 21 in the center.
A pre-molded insulator 35 and a push pipe 36 are provided on the outer periphery of the l/21, and a guide piece 33 is provided at the tip of the insertion side.
A terminal 38 connected by a hetulip contact 37 is attached. Therefore, when the bolt 39 is removed and the movable connection unit is pulled out downward in the figure, the terminal 38 is separated from the tulip contact 37, and the fixed connection unit 28 and the movable connection unit 27 are separated.

Next, another embodiment will be explained with reference to FIG.

An example of this is a gas-insulated substation installed in the basement of a building. There are many pillars 4o in the building, and each piece of equipment must be placed in a space that avoids the pillars 40. For this reason, the second
In the conventional method shown in the figure, a design had to be made for each 4° position of the column. 'According to the present invention, the fourth
As shown in the example in the figure, arrange each device in a convenient position,
All you have to do is connect them with cables 21 to 24, and each device can be the same as the one in Figure 3.

Although the explanation will be explained beforehand, it is best to configure a unit by considering transport restrictions, and in Fig. 3, GIS unit 3,
5 is a separate unit, and 7 MOFs 4 provided by the company are connected at the site.

In this way, by connecting the cables 21 to 24 between each device 1" and making the connecting parts of each cable to the GIS unit 3.5 and the transformers 6 and 7 removable as shown in Figure 6, it is possible to prevent accidents in the event of an accident. In other words, if there is an accident or inspection of the GIs unit 3 is required, disconnect the cable 21 and the GIS-'-=t 3, and disconnect the cable 23 and the GIs unit 3. disconnect the
The movable connection unit 27 of the cable 21 is connected to the fixed connection unit 28 of the transformer 6. This allows G.I.
Operation can be continued with the S unit 3 separated, and in the unlikely event that it is connected to the power transmission line 2, the power supply
Ifr device becomes bank up.

In order to put the above-mentioned method into practice, it is necessary to cut a considerable length of slack in the cable 21 or 22 in advance. I have to keep it.

Therefore, the G of cable 21.22 and cable 23.24 is
If the IS unit side ends can be connected to each other, the slack in these cables can be reduced in advance.

This embodiment is shown in FIGS. 7 and 8.

FIG. 7 shows a cable joint in which a pair of fixed-side connecting units 28 shown in FIG. The same reference numerals are given to the equivalents, and the explanation will be omitted. The hollow parts 1 of the annular seats 34 and 34' on both sides are -f: lids 41 and 4, respectively.
1' and hermetically sealed. The entire assembly is housed within a joint cover 42, and this cover 42 is filled with SF6 gas or oil 43. Prepare a cable joint like this in case of an abnormality.

If the GIS unit 3 in Fig. 3 has caused an accident or is to be inspected, will the cables 21 and 23 be connected to the GIS unit 3? As shown in FIG. )3
7. Connect between cables 21 and 23 via 37'. With this, donations can be continued except for G15-Knit 3.

Furthermore, for this row of fire barrels, the detachable connection portion shown in FIG. 6 may be used at least for the connection between the GfS units 3 and 5 and the cables.

〔Effect of the invention〕

As explained above, the present invention connects the switchgear unit and the transformer by the cables 21, 22 and 23, 24 whose one end is connected to the power transmission line, and at least separates the switchgear unit and the cable. Since the connecting portion is made flexible, the following effects are obtained.

(1) The arrangement of the restraining tower, switchgear unit, and transformer can be freely selected, so it can be adapted to any site.

(2) It is economical because it uses a cable that is cheaper than a gas-insulated busbar.

(3) It is not necessary to design the gas insulated bus bar each time, so the delivery time is shortened.

(4) Improved response to accidents, etc., resulting in shorter stop times.

The invention also provides cables 21.22 and 23.2.
Since a cable joint is used to connect the four parts, the length of the cable to be loosened in advance is reduced, and the switchgear unit can be quickly completely separated to save medical security.

[Brief explanation of drawings]

Figure 1 shows a skeleton of an example of an industrial power receiving system.
Figure 2 is a plan view of a scaled-down substation corresponding to Figure 1;
4 and 4 are plan views of scaled-down transformers according to different embodiments of the present invention, FIG. 5 is a partially sectional front view of the GIS unit, and FIG. FIG. 7 is a sectional view of the cable joint, and FIG. 8 is an I sectional view of the connection part according to the operating method of the present invention. 2...Power transmission line, 3,5...GIS unit, 6,7
...Transformer, 8...Bunocinda, 21-24...
Bud'/7da, 27...Machi i assistant side connection unit, 28
Mountain fixed side contact 1 Kuchi 1 Ji 2 Mi 3 Mi 4th ward 7th ward G ward S Komo C Mi 8th

Claims (1)

[Scope of Claims] A 1° power transmission line is tied to a detention tower, the power transmission line is connected to one end of a reduced-sized switchgear unit, and the other end of the unit is connected to a transformer, in which the power transmission line is connected to a transformer. The other end of a first cable whose one end is electrically connected is connected to one end of the unit, the other end of the unit and the transformer are connected by a second cable, and the first and second cables are connected to each other. At least one end of each of the transformers is connected to the unit or the transformer by a detachable connection part. 2. The compact substation according to claim 1, characterized in that both of the cables have removably connected portions on the connection sides with the unit. The other end of a first cable, one end of which is visibly connected to a power transmission line held by a 3° detention tower, is connected to one end of a reduced-sized switchgear unit by a removable first connection part, A second cable is provided, one end of which is connected to the other end by a second connection portion that is detachable from the other end, the other end of the second cable being connected to a transformer, and the surface connection portions of both cables, respectively. A method of operating a reduced-sized substation characterized by disconnecting the unit, connecting each of the disconnected ends with cable joints, and separating and rotating the unit. 46. The compact substation according to claim 3, characterized in that both the cables have lengths with a predetermined slack in advance, and the two cables are directly connected by the cable joint. Driving laws of the place.