JPS61185004A - Removal of circuit unit for 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 relates to a method for removing a branch line unit from a bus disconnector unit when repairing a gas insulated switchgear installed in an electrical station such as a substation. .

[Invention @! Summary] The present invention provides a method for removing a branch line unit during repair of a gas insulated switchgear in which a branch line unit is connected to a first and second bus disconnect unit. By replacing at least one of the two with a short-circuit bus unit, the branch line unit can be removed without power outage and without gas pressure acting on the insulating spacer at the disconnection section.

[Conventional Art] As an example of the configuration of a gas insulated switchgear installed in an electrical station such as a substation, as shown in FIG. There is a dual bus configuration in which a plurality of cable lines C1, C2, . . . are branched and connected via disconnectors. In Figure 4,
AI, A2, A3, . . . are branch line units, B11. B12. B13
．． . . . are the first unit bus conductor UBI and the first unit bus conductor UBI, respectively.
A first bus disconnector unit, B21°B23. . . . are second bus disconnector units in which a second unit bus conductor UB2 and a second bus-side disconnector DS2 are housed in a second bus container to form a unit for each line. Branch line unit AI.

A2, A3, . B13. ... and the second bus disconnector unit B21. B22. B23
．． ... are connected. and first bus disconnector units B11, B12. The unit bus conductors of... are connected in series to constitute the first bus BUS1, and the second bus disconnector units 821, 822, . ... are connected in series to form a second bus BUS2.

If an accident occurs in one of the branch line units in a gas-insulated switchgear configured as above, remove the line unit container of the branch line unit where the accident occurred from the first and second bus disconnector units. It needs to be removed and repaired. Conventionally, when removing the line unit container of a branch line unit where an accident occurred from the first and second bus disconnector units, it was necessary to remove the branch line unit and the first and second bus disconnector units in order to avoid a power outage in the entire electrical station. At least one of the insulating spacers respectively disposed between the second bus disconnector unit remains on the bus disconnector unit side, that is, at least one of the first and second busbars is in a charged state. The line unit container was disconnected while the unit was still in place.

[Problems to be Solved by the Invention] However, when the branch line unit is disconnected by the method described above, when the container of at least one bus disconnector unit is filled with high pressure gas, In other words, the work is said to be dangerous because it is necessary to disconnect the line unit container from the insulating spacer while high gas pressure is acting on the insulating spacer connected to the bus disconnector unit container. There was a problem.

An object of the present invention is to provide a method for removing a branch line unit without power outage and without performing the dangerous work of removing the line unit container from an insulated spacer where high gas pressure is applied.

[Means for Solving the Problems] The present invention is illustrated in FIGS. 1 A to C and 2 showing an embodiment thereof.
As seen in the figure, first and second unit bus conductors UB1 and UB2 forming part of first and second bus bars BIJSI and BtJS2 and first and second bus side disconnectors 0
31 and DS2 into the first and second busbar containers 1, respectively.
and first and second bus disconnector units Bit, B12. ...and 321.1322. ...and the first and second busbars BU
Branch line units AI, A2, . . . are formed by storing equipment including a circuit breaker CB placed between SI and BUS2 and lines branching from both buses in a line unit container 3 filled with insulating gas. branch line units A1, A2, . . . and first and second bus disconnector units 311, 312, . ...and 321.322
．． ... and the first and second insulating spacers S1, respectively.
This is a method of removing the branch line unit A1 from the first and second bus disconnector units B11 and B21 when repairing the gas insulated switchgear connected via the bus line disconnector unit B11 and the second bus disconnector unit B21.

In the present invention, when one of the first and second bus disconnector units B11 and 812 is powered off, the power outed bus disconnector unit is converted into a short circuit bus unit in which the bus conductor is housed in a short circuit bus container. By performing the work of connecting with the BO, the first and second bus disconnector units 311
and 821 is replaced with the short-circuit bus unit 80 to bring the short-circuit bus unit into a energized state, and then the line unit container 3 of the branch line unit A1 is removed.

[Operation of the invention] As described above, by replacing the power-out bus disconnector unit with the shorted bus unit while one of the first and second bus-bar disconnector units is out of power,
If at least one of the first and second bus disconnector units is replaced with a short-circuit bus unit and the short-circuit bus unit is energized before the line unit container of the branch line unit is removed, the inside of the bus disconnector unit can be removed. Since the line unit container can be removed after handling the gas, there is no need to remove the line unit container from the insulating spacer under high gas pressure, and work safety can be ensured without the need for dangerous work. .

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

Referring to FIGS. 1A and 2, the structure of a gas insulated switchgear to which the method of the present invention is applied is schematically shown. In the example shown in these figures, the first busbar container 1 includes a tube 1a extending in the transverse direction and a tube 1b extending in a direction perpendicular to the tube 1a.
Likewise, the second generatrix container 2 is a cross tube-shaped container consisting of a tube 2a extending in the lateral direction and a tube 2b extending in a direction orthogonal to the tube 2a.

The line unit container 3 is a cylindrical container with its axis oriented vertically, and branch pipes protrude horizontally at the upper and lower sides of the back side (left side in FIG. 1A). 3a and 3b are provided. Branch pipes 3a and 3
A flange is provided at the tip of each tube 1b, and the flanges of both branched tubes are connected to the tubes 1b of the first and second busbar containers via first and second insulating spacers 81 and S2, respectively.
and 2b is hermetically connected to a flange at one end.

In this embodiment, three line unit containers 3 are installed at a predetermined interval in the horizontal direction, and a circuit breaker CB, a line-side disconnector DSo, and a grounding station ES are installed inside each of these containers.
W and cable head CH are housed for 3 phases to form 3 branch line units AI.

A3 to A3 are configured (see FIG. 2).

Further, a first unit bus conductor UB1 and a first bus side disconnector DS1 are housed in each first bus container 1 connected to the branch line units A1 to A3, respectively, and a first unit bus conductor UB1 and a first bus side disconnector DS1 are housed in each first bus container 1 connected to the branch line units A1 to A3, respectively. 1 bus disconnector units B11 to 31
3 are made up. Similarly, a second unit bus conductor tJB2 and a second bus side disconnect @DS2 are provided in each second bus container 2 connected to branch line units A1 to A3.
A second bus disconnector unit B21 to 823 is constructed by housing the following and unitizing each line. Branch line units A1 to A3 and first bus disconnector unit B
11 to 313 and the second ffl road disconnector unit B21
to B23 respectively open 111 device unit U1.
These opening device units U1 to U3 constitute a gas insulated opening system MGIS.

The branch line unit of each opening device unit and the first and second
Since the configuration is the same as that of the busbar new circuit unit,
The configuration of each unit will be explained by taking as an example the branch line unit A2 shown in FIG. A and the new bus line equipment units B12 and [322 connected to this unit.

One end of the circuit breaker CB of the branch line unit A2 is connected to the connecting conductor 4.
and an embedded conductor 5 penetrating through the first insulating spacer S1, and connected to one end of the disconnector DS1 of the first bus disconnector unit connected to the branch line unit, and
It is connected to one end of the disconnector DS2 of the second bus disconnector unit B22 connected to the branch line unit via the connecting conductor 6 and the embedded conductor 7 penetrating the second insulating spacer S2.

The other end of circuit breaker CB is disconnector DS2 and cable head C)
A grounding device ESW is connected to the cable C constituting the line via the cable head CH, and is provided between the terminal on the disconnector DS2 side of the cable head CH and the ground.

Bus disconnector unit B11. B12, and 812. B1
The outer ends of the tubes 1a constituting the containers 1 of the busbar new circuit units B11 and 813 located at both ends are connected to each other via the flexible tubes 8 and the insulating spacers SO. It is hermetically closed by lids 9 and 10 attached via insulating spacers SO.

Similarly, bus disconnector unit B21. B22 and B22
Adjacent ends of the tubes 2a constituting the busbar container 2 of 323 degrees are connected via the flexible tube 8 and the insulating spacer SO, and the busbar disconnector units 821 at both ends constitute the container 2 of B23. The outer end of the tube 2a is hermetically closed by lids 11 and 12 attached via insulating spacers SO.

The unit bus conductors UB1 of the first bus disconnector units B11 to B13 and the second bus disconnector unit 821
Each of the unit bus conductors UB2 of B23 is connected at both ends to a buried conductor 13 passing through an insulating spacer SO, and connected to the bus disconnector units B11 to B13 via the buried conductor.
The unit bus conductors UB1 and the unit bus conductors UB2 of the second bus disconnector units 321 to B are connected to each other to form a first bus BUS1 and a second bus BUS2. An operating device box 14 is arranged on the front side of the container 3 of each branch line unit, and the operating device of the circuit breaker CB and the like are housed in the operating device box.

SF6 gas is filled in each of the first busbar container 1, second busbar container 2, and line unit container 3 at a predetermined pressure. Suppose that in the gas-insulated switchgear as described above, an accident occurs in the branch line unit A2 of the switchgear unit U2, and it becomes necessary to remove the line unit container 3 in order to repair the unit. In such a case, the method of the present invention can be applied to the insulating spacer S without causing a power outage to the entire electrical station and to which high gas pressure is applied.

The line unit container 3 can be removed without performing the dangerous work of removing the container 3 from the inside.

In the method of the present invention, first, one of the busbars of the first and second busbar disconnector units B12 and 822 is turned off. In this embodiment, the power is cut off to the first bus BUSI, and the bus container 1 of the first bus new circuit unit B12 is
Collect the SF6 gas inside.

Next, the first busbar container 1 is removed from the insulating spacers S1 and SO, and the first busbar disconnector unit 312 is replaced with a short circuit busbar unit BO, as shown in FIG. 1B. This short circuit bus bar unit 3o connects a short circuit bus conductor UBO similar to the first unit bus conductor UB1 to a tube 1 of the first bus bar container 1.
It is housed in a tubular short-circuit bus container 20 having the same dimensions as part a, and the short-circuit bus container 20 is a branch line unit A2.
It is formed in a shape that does not have any protrusions or the like that protrudes toward the branch line unit so as not to impede the movement of the branch line unit.

Short-circuit bus bar unit 2 installed, short-circuit bus bar unit
0 is filled with SF6 gas at a predetermined pressure.

After the short-circuit bus unit BO connects the bus disconnector units B11 and 813 that constitute the first bus, power is applied to the first bus BUS1, and then the second bus BLJS2
cause a power outage. After powering off the second bus BtJS2,
The gas in the container 2 of the second bus disconnector unit 822 is recovered so that no gas pressure acts on the insulating spacer S2 connected to the container 2. After that, as shown in FIG. 1C, remove the insulating spacer S2 from the container 2 of the bus disconnector unit B22, pull out the container 3 of the branch line unit A2 as shown by the arrow in FIG. 1C, and repair the unit A2. I do.

The repaired branch line unit A2 can be installed in the opposite manner to the above. That is, after the container 3 of the branch line unit A2 is first installed at a predetermined position, the insulating spacer S2 is connected to the container 2, and the container 2 is filled with SF6 gas.

Next, the first bus 1iBUS1 is powered off, and the short-circuit bus unit BO is replaced with the first bus disconnector unit B12. When SF6 gas is filled in the container 1 of the new bus unit A2, electricity is applied to the first bus BUSI.

In the above example, when the insulating spacer S2 requires inspection and repair, the inside of the container 2 becomes open, so the container 2
It is necessary to completely recover the gas in the container 2, but if inspection and repair of the insulating spacer S2 is not required, the insulating spacer S2 can be left in the container rj12, so that the gas in the container 2 can be recovered. can be recovered to atmospheric pressure.

In the above embodiment, since the first and second bus disconnector units 812 and B22 are arranged vertically,
The branch line unit can be removed by replacing one of the bus disconnector units with a short-circuit bus unit, but as shown in FIG. and the first and second
When the EJm new line switch units are arranged side by side in the horizontal direction, the branch line unit cannot be removed simply by replacing one bus disconnector unit with a short circuit bus unit.

In such a case, first, as shown in FIG. 3B, the first bus BUSI is powered off and the first bus disconnector unit B
12 gas is recovered and the first busbar new route unit B1
2 is replaced with the short circuit bus unit Bo1. Next, the first bus line BUS1 is energized, the second bus line BLIS2 is cut off, the gas in the second bus line switch unit B22 is recovered, and the second bus line disconnector unit B22 is connected to the short circuit bus line unit. [Replace with 3o2. Next, the branch line unit A2 is pulled out in the direction of arrow P in FIG. 3, and the unit is repaired.

After the repair is completed, return the branch line unit A2 to its original position, and connect the first and second bus disconnector units B12 and 8.
Make 22 connections.

[Effects of the Invention] As described above, according to the present invention, the f9? By replacing the bus disconnector unit with the short circuit bus unit, at least one of the first and second bus disconnector units is replaced with the short circuit bus unit, and power is applied to the short circuit bus unit. Since the line unit container of the branch line unit is removed from the main line, the line unit container can be removed after the gas in the container of the new bus line unit is removed. Therefore, there is no need to carry out the dangerous operation of removing the line unit container from the insulating spacer on which high gas pressure is applied, and there is an advantage that the safety of the operation can be ensured.

[Brief explanation of drawings]

Figures 1A to C are explanatory diagrams for explaining a -° embodiment of the present invention, Figure 2 is a rear view of a gas-insulated switchgear to which this embodiment is applied, and Figures 3A to C are illustrations of the present invention. An explanatory diagram for explaining another embodiment, FIG. 4 is a 1llil connection diagram showing an example of a gas insulated switchgear to which the present invention is applied. 1 and 2...first and second bus bar containers, 3...line unit containers, A1 to A3...branch line units,
311 to B13...first bus new circuit unit, [
321 to B23...Second bus 11 [1-path unit, Bo, Bol, Bo2...Short-circuit bus unit, U
Bl and tJB2...first and second unit bus conductors,
CB: circuit breaker, DSl and DS2: first and second bus-side disconnectors, DSo: line-side disconnector, ESW
...Grounding device. Lie + r + 4! 441 Chapter 2

Claims (1)

[Scope of Claims] First and second unit bus conductors and first and second bus side disconnectors constituting parts of the first and second bus bars are placed in first and second bus containers, respectively. first and second bus disconnector units that are housed in a unit and are unitized for each line;
and a branch line unit in which equipment including a circuit breaker disposed between the second bus bar and lines branching from both bus bars is housed in a line unit container filled with insulating gas, In the method for removing the branch line unit when repairing a gas insulated switchgear in which a line unit and the first and second bus disconnector units are connected via first and second insulating spacers, respectively, the method includes: While one of the first and second bus disconnector units is powered off and the other is energized, the bus disconnector unit that has experienced the power outage is replaced with a short-circuit bus unit that stores the bus conductor in the short-circuit bus container. By performing the work, the first
and a gas insulated switchgear, characterized in that at least one of the second bus disconnector units is replaced with a short circuit bus unit to place the short circuit bus unit in an energized state, and then the line unit container of the branch line unit is removed. How to remove the line unit.