JPS61207109A - Gas insulated switchgear - 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 [Industrial Application Field 1] The present invention is directed to a gas insulation 11 installed in an electrical voltage field such as a substation.
i1 This relates to the Ill device.

[Conventional technology vIi] As a gas insulated switching WA installed in substations etc.
As shown in the figure, a plurality of busbar units Ub.

There is one in which LJb, . . . are arranged in parallel and each Bl line unit line unit UC is connected.

Each 81-wire unit ub has a main conduit 3 connected to one end of the insulating spacer 1 for bus bar division and the other end connected to the expandable container 2.
a, a branch pipe 3 b branched from the main pipe, a bus bar container 3 on the right, a bus conductor 4 housed in the main pipe 3 a of the bus container 3 and constituting a three-phase m-line BUS, and a branch pipe 3 b. Conduit 3
The bus bar side disconnector DS1 is housed in the space in b, and the adjacent bus bar units 1 to ub, and ub comrades are provided with bus bar division insulation for the expandable container 2 of one bus bar 1 and the bus bar unit 1 of the other bus bar unit. They are mutually connected via a spacer 1. The bus conductor 4 of each bus bar unit is connected to the bus conductor 4 of an adjacent bus bar unit via an embedded conductor provided in the insulating spacer 1 for bus bar division. The expandable container 2 is a container that can be expanded and contracted in the axial direction, such as a bellows.

In the branch pipe line 3b of each bus unit ub, there is a line unit jJc in which equipment including a circuit breaker CB is housed in a container 5.
are connected via an insulating spacer 6 for branch connection.

Each bus bar container 3 is also provided with a hand hole forming branch pipe 3C extending axially with the branch pipe 3b on the opposite side to the branch pipe 3F, ), and between the branch pipes 3c and [1 The section is hermetically closed by an armor plate 30. The cover plate 30 is designed to be removable, and with the lid removed, the C1 busbar conductor 4 and the busbar side disconnector DSI can be attached and detached through the opening of the branch pipe 3c. It looks like this.

In this example, the container 5 of the line unit l-Uc is a cylindrical container with its axis oriented in the vertical direction.
Inside the container 5, there is a circuit breaker CB whose one end is connected to the busbar conductor 4 via the busbar side disconnection 1al)Sl, and a lateral grounding device E for grounding the breaking fixed point to ground both ends during inspection of the circuit breaker.
S11 and E S 12, a line-side disconnector DS2 whose one end is connected to the other end of the circuit breaker CB, and a line-side disconnector DS2.
A cable head CHd connected to the other end and a cable head grounding device ES2 are housed. The container 5 has a flit opening in its upper part, and the opening is connected to the branch line 3b of the bus bar container via a branch connection insulating spacer 6 connected to the branch line 3b. One end of the circuit breaker CB is connected to the bus-side disconnector DSI via an embedded conductor provided in the branch connection insulating spacer 6.

Note that the bus-side disconnector DS1 can also be provided in the line unit Uc, in which case the bus-side disconnector DS1 can be installed in the line unit Uc.
A bus bar container 3 and a bus bar BUS housed in the bus bar container 3
It is composed of

The insulating spacer 1 for busbar division of each busbar unit ub has three cone-shaped protrusions 1a (for three phases), and these three
The protrusions are arranged in a triangle.

Then, a buried conductor 1b for bus bar connection is provided by penetrating the axis of each protrusion 1a of the insulating spacer 1 for bus bar division, and at both ends of each buried conductor 1b, the bus bar units on both sides of the insulating spacer are connected. A bus conductor 4 is detachably connected.

On the other hand, the branch connection insulating spacer 6 has a protrusion 6a that protrudes toward the bus conductor 4 side, and a branch connection embedded conductor 6b is provided by penetrating the axis of the protrusion 6a of the branch connection insulating spacer. , one end of the embedded conductor 6b is connected to the busbar side disconnector DS1.
The other end is connected to one end of the circuit breaker C13.

When the electrical station has a double bus configuration, two bus units Ub are connected to each line unit, but in this case, two bus units Ub are connected to each line unit. The units are arranged side by side in a direction perpendicular to the paper plane of FIG.

Each busbar container 3 and the container 5 of the line unit are filled with an insulating gas such as SF6 gas at a predetermined pressure.

As mentioned above, the insulating spacer 1.6 used in the gas insulated switchgear has a cone-shaped protrusion 1a.

6a, the reason for installing these protrusions 1a and 6a is to increase the creepage distance of the insulating spacer;
The purpose is to alleviate the electric field of the buried conductors 1b and 6b and to increase the strength of the insulating spacer.

By the way, when these insulating spacers are used to connect the busbar units tJb, there are methods of arranging the busbar section insulating spacers as shown in FIGS. 7 and 8.

In the configuration shown in FIG. 7, the protruding portion 1a of the insulating spacer 1 for bus bar sectioning is arranged to face the expandable container 2,
In the configuration shown in FIG. 8, the protruding portion 1a of the busbar section insulating spacer 1 is arranged toward the main conduit 3a side of the busbar container.

[Problem to be Solved by the Invention 1-When adding a unit or unit to a gas-insulated switchgear as described in h. It is preferable to be able to connect an additional unit to an existing unit in a short time. In addition, when an accident occurs in one of the busbar units, when removing the unit in which the accident occurred from other units, it is possible to easily remove only the busbar container of the relevant unit 1~ from the other units without disassembling the adjacent units. J that can be removed
: It is preferable to leave it to sea urchin.

As shown in FIG.
When the cable is placed facing the expandable container 2 side, after removing the cover plate 30, remove the 1] single-wire conductor 4 and the busbar side disconnector 1] S1 through the opening of the branch conduit 3G for forming the hand hole. Then, the expandable container 2 is compressed to the right side as shown in FIG. 7 and removed from the busbar container 3. In this case, the insulating spacers °1 on both sides of the removable busbar container 3 can remain connected to the adjacent unit, and there is no need to disassemble the adjacent unit.

However, the configuration shown in Figure 7 is
There is a problem in that the expandable container cannot be easily inserted. In other words, in Figure 6 (note that Figure 6 shows the case where the insulating spacers 1 are arranged in the same direction as in Figure 8), the three busbar units ub and the line on the right side are Unit L
Assuming that Jc is the existing unit 1-, and the three busbar units ub on the left side and the line 1 unit I~LJC are the expansion units 1~, after installing the expansion unit in its proper position, It is necessary to insert an expandable container 2 between the expansion unit and the existing unit, and connect the main pipe line 3a of the busbar container at the end of the expansion unit to the insulating spacer 1 at the end of the existing unit via the expandable container 2. However, in the configuration shown in FIG. 7, in such a case, the protruding portion 1a of the insulating spacer 1 becomes an obstacle, making it impossible to insert the expandable container 2.

Further, according to the configuration shown in FIG. 8, as shown in FIG. 6, when adding a unit, the protrusion 1a of the insulating spacer
However, in this configuration, in the event of an accident with the busbar unit, the busbar container 3 can be inserted with the insulating spacer attached to the adjacent unit.
There is a problem in that it is not possible to remove the In other words, in the configuration shown in Fig. 8, when an accident occurs in one of the busbar units ub, if the insulating spacers 1.1 on both sides of the busbar unit in which the accident occurred are not removed from the adjacent units, the busbar of the unit in which the accident occurred will be removed. The container cannot be removed. In this way, if it is necessary to remove the insulating spacer from the adjacent unit, it becomes necessary to recover the gas from the adjacent unit and refill it with gas, making the operation significantly more complicated. In addition, in the case of a gas-insulated switchgear that normally has a double bus bar configuration, it is possible to prevent a power outage to the entire electrical station by shutting off only one bus bar on the side of the bus bar unit where the accident occurred, but the above As such, if it becomes necessary to recover gas from other busbar units adjacent to the busbar unit in which the accident occurred, it becomes necessary to shut down the entire electrical station, making it impossible to take advantage of the advantages of the double busbar configuration. I can't.

J3, in the above example, insulating spacer 6 for branch connection
It is also conceivable to arrange the protruding part of the line unit 1- to face the inside of the container 5, but in this case, there is no dust in the four inner parts of the cone-shaped protruding part 6a of the insulating spacer for branch connection. This tends to accumulate, and there is a risk of insulation failure of the insulating spacer.

In addition, if the protruding part of the insulating base 16 for branch connection is directed toward the container 5 side, in the event of an accident with the line unit,
It is difficult to remove the line unit container. For these reasons, the insulating spacer 6 for branch connection has no choice but to be disposed with its protruding portion 6a facing the bus bar container 3 side as in the above embodiment.

The purpose of the present invention is to improve the speed when adding units and
An object of the present invention is to provide a gas insulated switchgear which can connect or disconnect a line III container without affecting adjacent units in both cases of an accident.

1 Means for Solving Problem 1 In the gas insulated switchgear to which the present invention is directed, as shown in FIG. , a main pipe line 3a having a main pipe line 3a to which the expandable container 2 is connected to the other end, and a branch pipe line 3b branched from this main pipe line 3a, inside the main pipe line 3a.
,: A plurality of busbar units UB each containing a busbar conductor 4 are arranged in parallel, and adjacent busbar units are connected to each other via an expandable container 2 and an insulating base for busbar division. ing.

The branch pipes of each bus unit ub are equipped with equipment including circuit breakers CB. Line unit configured by being housed inside A5
Jc is connected via an insulating spacer 6 for branch connection. The insulating spacer 1 for the bus line 8 of each bus unit Ub has a protrusion 1a that protrudes into the busbar container of the Bj line 1-, and the protrusion 1a of the insulating spacer for the IN] line 8 The push-in conductor 1b for connecting the bus bar is provided by making the shaft core part pass through, and the insulating spacer 6 for branch connection has a protruding part 6a (!-) of the insulating spacer for branching that protrudes toward the bus conductor 4 side. Branch W: C by penetrating the shaft core of
A ready-to-use buried conductor is provided.

In such a gas insulated switchgear, as shown in FIG. The distance between the department! 1ift L 1 and bus bar container 3
When the busbar container 2 is separated from the insulating spacer 1 for branch connection and the one terminal container 3 is moved toward the expandable container 2 along the axial direction of the m-line conductor, the busbar container 2 is removed from the protrusion of the insulating spacer 1 for branch connection. In order that the moving distance L2 at L (abutting the hem of 1a) satisfies the relationship 1.2>l-1, the line division insulating spacer 1 and the branch connection insulating base 1 have a thick protrusion 1.
A and b are provided with 6a.

[Operation of the invention 1] As described above, when the protrusions of the insulating spacers 1 and 6 are installed, the bus bar capacity i1'j3 shown in FIG. Insulating spacer 6
After removing the expandable container 2, move the busbar container 3 along the axial direction of the busbar conductor 4 in the direction of arrow P (expandable container side)
By moving the busbar container 3 over a distance of , the busbar container 3 can be placed in a position where it does not hit the protrusion 1a of the insulating spacer 1.

Therefore, in this state, the bus bar container 3 can be removed by moving it in the direction of arrow Q (direction away from the branch connection insulating spacer).

In this case, since the bus bar segment insulating spacer 1 may remain connected to the adjacent bus bar unit, there is no need to cause a power outage to the adjacent units 1 to 1.

In addition, even if it is possible to leave the insulating spacer connected to the adjacent unit when removing the busbar container from the lifting platform of a gas-insulated switchgear V device with a single-bus configuration, it is necessary to cut off the power to the adjacent unit. There is. However, in this case as well, if you leave the insulating spacer connected to the adjacent unit J5, there is an advantage that there is no need to recover the gas from the adjacent unit i. The present invention is useful because it can omit troublesome work such as filling.

[Example 1 The present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 and 2 show essential parts of an embodiment of the present invention.b
Therefore, the overall configuration of this embodiment is similar to that shown in FIG. The outer peripheral edge of the flange 3bf provided at the opening of the branch pipe 3b of the busbar container 3 is located inside the end surface of the flange 3af provided at the opening of the main pipe 3a on the insulating spacer 1 side (expandable container 2 side). (so that the outer peripheral edge of the flange 3bf does not protrude toward the insulating spacer 1 side from the end surface of the flange 38f).

In the present invention, the difference from conventional gas insulated switchgear is that the main pipe side flange surface 1 of the insulating spacer 1 for bus bar section.
0 and the end of the embedded conductor 1b for bus bar connection 111t
L1 and 1 respectively when the busbar container 3 is separated from the busbar division insulating spacer 1 and the busbar container 3 is moved toward the expandable container 2 in the direction of the arrow P shown in the figure along the axial direction of the busbar conductor.
Movement distance 11t until the inner periphery of the branch pipe line 3b of the wire container 2 comes into contact with the hem of the protruding part 1a of the branch connection insulating spacer 1
(The shortest distance ll11 in the tu line direction between the inner periphery of the branch pipe 3b and the hem of the protrusion 6a of the branch connection insulating spacer 6
) 1-2 is that the protrusions 1a and 6a of the bus bar section insulating spacer 1 and the branch connection insulating spacer 6 are provided so as to satisfy the relationship L2>Ll.

With this configuration, when an accident occurs in a bus unit, only the container of the bus unit in which the accident occurred can be removed without causing a power outage to adjacent units (of course in the case of a double bus configuration). However, if an accident occurs in any of the busbar units, after recovering the gas in the container 3 of the busbar unit in which the accident occurred, remove the cover plate 30 of the busbar container 3 and remove the busbar conductors 4 and Take out the new line DSI on the busbar side from the container 3, then remove the expandable container 2, and
<Place the 1-wire container 3 on the outside from the 81-wire division insulating spacer 1 and the branch connection insulating spacer 6. Then, remove the busbar container 3.
J: shown in FIG. , the 18-wire container can be removed.

4 and 5 show another embodiment of the present invention, so in this embodiment, three of the insulating base weights 6 for branch connection are shown.
The phase protrusions are oriented 90 degrees differently than in the embodiment shown in FIG. In this case, the distance L1 between the main pipe side 7 flange 10 of the insulating spanner 1 for /U line division and the end of the embedded conductor 1b for bus bar connection and the bus bar capacity Z3 are 111
When the busbar container 3 is separated from the wire division insulating base 1 and moved to the expandable container 2 side along the axial direction of the busbar conductor in the direction of the arrow P shown in the figure, the busbar capacity i! ! The moving distance until the inner periphery of the branch pipe 3b of 82 comes into contact with the hem of the protrusion 1a of the insulating spacer 1 for branch connection (the distance between the inner periphery of the branch pipe 3b and the protrusion 6a of the insulating spacer 6 for branch connection) The protruding parts 1a and 6a of the 1Ilk line segment insulating spacer 1 and the branch connection insulating spacer 6 are set so that the shortest distance (to the hem) L2 in the generatrix direction satisfies the relationship L2>11. By doing so, the same effects as described above can be obtained.

FIGS. 9A and 9B show a modification of the insulating spacer 1 for busbar section used in the present invention, and this insulating spacer 1 is
The positions where the phase to W phase protrusions 1au to 1aw are provided are different from those in the above embodiments.

In other words, in this insulating spacer 1, the conductor 1 is provided by penetrating the three-phase protrusions 1au to 1aw.
The protrusion height Ll from the flange surface of the insulating spacer 1 of bu to 1bw (see Fig. 9B) and the hem of the protrusions 1aw and 1au of the inner periphery and both ends of the container 3 connected to the insulating spacer 1 Between the shortest distance 1111L3 and the
U has a relationship of 1.1<13. In addition, in this example, the intersection 01 of the line Y-Y connecting the center of the protruding part 1av of the medium phase and the center of the insulating spacer 1 and the inner peripheral surface of the container 3 on the side away from the protruding part 1aV, and the intersection 01 side The protrusion part 1 of the phase at both ends
Tangent line X-X drawn to touch the hem of au and 1aw
The distance L4 between is upper Ft! It is larger than I-3 and is set at 1.9. Also, the shortest distance between the hem of the middle phase protrusion 1aV and the inner circumference of the container 3! +11 L, 5 is set smaller than 3 as described above.

When using the insulating base v1 provided with the protrusions 1au to 1aw in this way, the tangent line XX is directed vertically as shown in FIG. ) By arranging the conductors 1 bu to 1 bw away from each other, it is possible to increase the distance between the conductors 1 bu to 1 bw and the flange surface of the branch connection insulating spacer 6 where dust tends to accumulate.
A highly reliable gas insulated switchgear that is not affected by dust accumulated on the flange surface of the branch connection insulating spacer 6 can be obtained.

In this case, the same effect can be obtained even if the contact aX-X is arranged so as to face in the vertical direction. In addition, when arranging the tangent line X-X in the vertical direction, the protrusion lau or 1a
The R short distance between the protrusion disposed above and inside w and the inner periphery of the container 3 may be smaller than the above L3.

[Advantageous Effects of the Invention 1] As described above, according to the present invention, the busbar container of each one-wire unit can be removed from the adjacent unit 1 while the insulating spacer remains connected to the adjacent busbar unit. There is an advantage that the busbar container can be easily connected or disconnected when adding units or in the event of an accident with the busbar units 1 to 1.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of an embodiment of the present invention;
The figure is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is an explanatory diagram for explaining the removal work of the busbar container in the embodiment of Figure 1, and Figure 4 is a main part of another embodiment of the present invention. FIG. 5 is a sectional view taken along the line ■-v in FIG.
7 and 8 are cross-sectional views showing the configuration of the main parts of the busbar unit of a conventional gas-insulated switchgear, and FIGS. 9A and 9B partially show a modification of the insulating spacer for busbar division used in the present invention. FIG. 2 is a front view and a bottom view shown in cross section. . 1... Insulating subaree for busbar division 12... Expandable container, 3... 1) 1-wire container, 3a... Main conduit, 3b...
- Branch pipe, 4... 111 wire conductor, 5... Line unit container, 6... Branch) Insulating spacer for g connection. Figure 9

Claims (1)

[Scope of Claims] A busbar conductor is disposed within the main conduit of a busbar container having a main conduit connected to one end of which is connected to a bus bar division insulating spacer and an expandable container connected to the other end, and a branch conduit branched from the main conduit. A plurality of busbar units housing the busbar units are arranged in parallel, and adjacent busbar units are connected to each other via the expandable container and the busbar division insulating spacer, and a branch pipe of each busbar unit includes a circuit breaker. Line units each including equipment housed in a container are connected via insulating spacers for branch connection, and the insulating spacer for busbar division of each busbar unit has a protrusion that protrudes into the busbar container of the busbar unit. An embedded conductor for bus bar connection is provided by penetrating the axis of the protruding part of the insulating spacer for bus bar division, and the insulating spacer for branch connection has a protrusion part that protrudes toward the bus conductor side. In a gas insulated switchgear in which an embedded conductor for branch connection is provided by penetrating the axis of the protruding part of the insulating spacer,
The distance L1 between the main conduit side flange surface of the busbar division insulating spacer and the end of the busbar connection embedded conductor, and the distance L1 between the busbar division insulating spacer and the end of the busbar connection embedded conductor, and the busbar container being separated from the busbar division insulating spacer and the busbar container being placed on the expandable container side. The bus bar is moved in such a way that, when the bus bar container is moved along the axial direction of the conductor, the moving distance L2 until the bus bar container comes into contact with the hem of the protrusion of the branch connection insulating spacer satisfies the relationship L2>L1. A gas insulated switchgear characterized by being provided with protruding parts of an insulating spacer for division and an insulating spacer for branch connection.