JPH02151214A - Line extension method for gas insulated switchgear - Google Patents

Abstract

PURPOSE:To shorten power interruption time of existing line under installation work as short as possible by employing a spacial cover at main bus terminating section at extending side and to prevent increase of size. CONSTITUTION:A field releasing shield 5' arranged at a main bus terminating section A' at extending side is surrounded by a main bus terminating section cover 60 made of a flexible tank 61, then the tank 61 of the terminating section cover 60 is contracted after installation of the main bus terminating section A'. Thereafter, the tank 61 is taken out from between the terminating section cover 6 and the extension side shield 5' followed by removal of the terminating section cover 6 and the opposite side shields 5, 5'. Then a mounting unit 7 is inserted between a main bus terminating section A on the existing side and the main bus terminating section A' at extending side thus interlinking the opposite side lines through a dismountable conductor 74. By such arrangement, power interruption time of existing line is shortened and installation area is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for adding lines to a gas-insulated switchgear using an improved busbar termination cover for convenient installation of additional lines.

(Prior Art) A gas-insulated switchgear makes advanced use of the insulation performance and arc-extinguishing performance of SF6 gas, and is configured by integrally combining a bus disconnector, a circuit breaker, a grounding device, and the like. This kind of gas insulated switchgear also has busbars.

It has the feature that it can accommodate various wiring systems by changing the combination configuration of disconnectors and the like.

Therefore, in the gas-insulated switchgear, lines may be added to the existing lines.

When installing a line that includes a detachable device for this gas-insulated switchgear, it is necessary to completely disconnect electrically from the existing gas-insulated switchgear that is in operation, and then install the additional busbar, perform operational tests,
In order to conduct a commercial frequency withstand voltage test, it is necessary to install a conductor end electric field mitigation shield and a bus termination cover at the busbar terminations of both existing and expanded circuits.

FIG. 11 shows the relationship between the main bus terminal end of a conventional gas insulated switchgear and the main bus terminal end of an additional line. In other words, in FIG. 11, the existing main bus terminal end A in the conventional gas insulated switchgear is formed by connecting the ends of the existing main bus tank 1 with insulating spacers 3a, 3b and 2C having embedded electrodes 2a, 2b and 2C. 3C, each embedded N pole 2a
, 2b, 2c support an internal conductor 4, an electric field mitigation shield 5 is inserted into the buried electrode 2b which is the terminal end of the internal conductor 4, and the outside thereof is surrounded by a bus bar termination cover 6. .

On the other hand, at the extension main bus termination part A' of the extension line, the ends of the extension side main bus tank 1' are similarly connected to insulating spacers 3 having embedded electrodes 2a', 2b' and 2cl, respectively.
a', 3b' and 3 cl, each embedded electrode 2a', 2b', 2C' carrying an internal conductor 4';
An electric field mitigation shield 5' is inserted into the embedded electrode 2b' which is the terminal end of the internal conductor 4', and the outside of the shield 5' is surrounded by an extension end cover 6'.

Therefore, when performing expansion work on the main bus bar termination section A' on the expansion side to the existing main bus bar termination section A, the installation of the expansion side bus bar termination section cover 6' is necessary to reduce the electric field at the end of the internal conductor 4'. This must be done after installing the shield 5'.
During this installation, it is necessary to secure an axial handling allowance H to avoid the portion where the shield 5' protrudes from the end of the insulating spacer 3b' at the end of the tank 1'. A similar handling allowance H is also required when removing the busbar end cover 6' again after the installation of the additional line is completed.

(Problem to be Solved by the Invention) For this reason, the main bus terminals A, A of the conventional gas insulated switchgear
In ', the pitch between the lines is larger than the ideal pitch by the centering distance H, which leads to an increase in the installation area and an extension in the axial direction of the attachment/detachment device.

Furthermore, when adding the main bus termination section A' of the expansion line to the main bus termination section A of the conventional gas-insulated switchgear, first connect and disconnect the internal conductor to the main bus termination section A of the existing and expansion side.
Inspection of dimensions and alignment with t'j and A', then commercial frequency withstand voltage test of the expansion line, and roughly the insertion and removal of the attachment/detachment device to the main bus terminals A and 8' on the existing and expansion sides. Although a number of steps will be taken, it is preferable from the standpoint of power supply stability and reliability to minimize the interruption of power supply to the existing line during this time.

The purpose of the present invention is to minimize the power outage of the existing line, to complete the installation, operation test, commercial frequency withstand voltage test, etc. of the expansion line, and to reduce the installation area by reducing the pitch between lines. This invention provides a method for adding lines to a gas-insulated switchgear that reduces the size of the bar.

[Structure of the Invention] (Means for Solving the Problems) A method for adding lines to a gas insulated switchgear according to the present invention is to attach an electric field mitigation shield to the end of the main bus bar on the existing side of the gas insulated switchgear and to When adding an expansion line to the existing line wrapped in a bus termination cover, first wrap the electric field mitigation shield provided at the expansion main bus termination with a main bus termination cover made of a flexible tank. After the expansion side main bus bar termination section is installed, the tank of the expansion side main bus bar termination section cover is deflated, and then taken out from between the existing side main bus bar termination section cover and the expansion side shield, and then the existing side main bus bar termination section is removed. After removing the cover and the shields on both sides, a detachable device is inserted between the existing main bus terminal end and the expansion main bus terminal end, and the lines on both sides are interconnected by the detachable conductor. be.

Roughly speaking, the method for adding lines to a gas insulated switchgear according to the present invention is to attach an electric field mitigation shield to the end of the main bus on the existing side of the gas insulated switchgear, and to add a line to the existing side line by wrapping the main bus end cover around the shield. When adding a side circuit, first install a large-diameter tank with a larger diameter than the outer diameter of the existing main bus termination cover around the electric field mitigation shield provided at the end of the main bus on the expansion side, and a large tank to close the opening. The expansion side main bus bar termination section cover made in combination with the diameter flat plate is wrapped, and after the expansion side main bus bar termination section is installed, the expansion side main bus bar I! The large-diameter tank of the end cover is moved and overlapped with the existing main busbar end cover, and then the large-diameter tank and the existing main busbar end cover are laminated together with the existing side shield and the expansion side shield. After that, remove the existing side shield and the expansion side shield, and then insert the detachable device between the existing side main bus termination and the expansion side termination, and connect the lines on both sides using the detachable conductor. It is characterized by this.

(Function) In the present invention, when adding an extension line to the existing line, the flexible tank of the main bus termination cover on the expansion side is shrunk and taken out, or the large diameter tank is removed from the main bus termination cover on the existing side. You can take it out after putting it on the cover. After this, the expansion work is completed by inserting a detachable device between the main bus terminals of both lines and interconnecting both lines with a detachable conductor.

(Example) Before explaining the line extension method for a gas insulated switchgear according to the present invention, the main bus terminal end portion of the gas insulated switchgear to which the present invention is applied will be explained with reference to FIG. In FIG. 1, the existing side main bus bar termination section A has the same configuration as the conventional one shown in FIG.

The present invention is characterized by the structure of the busbar end cover 60 of the main busbar end A' on the expansion side, as shown in FIG. That is, the busbar end cover 60 of the main busbar end A' on the expansion side is composed of a combination of a flexible tank 61 and a flat plate 62 that closes one end of the flexible tank 61.
It has a stud 63 for contracting or expanding. One side of the flexible tank 61 of this bus bar termination cover 60 is attached to the outer surface of the insulating spacer 3b' of the main bus termination part A' on the expansion side, surrounding the shield 5'.

Next, a method for adding lines to a gas insulated switchgear according to the present invention will be explained based on FIGS. 1 to 5. FIG. 1 shows a state in which the installation of the existing main bus bar termination section 8' to the existing main bus bar termination section A has been completed. In this state, there is no need to consider insulation for the gap between the main bus bar termination cover 6 of the existing side main bus termination portion A and the flat plate 62 of the expansion side main bus termination cover 60.

From the state shown in Fig. 1, first install the main bus bar end cover 60
Using the studs 63, the flexible tank 61 is retracted until the flat plate 62 touches the shield 5', as shown in FIG. Thereafter, as shown in FIG. 3, the flexible tank 61 is removed from the insulating spacer 3b' while being contracted, and taken out from between the shield 5' and the existing main bus bar end cover 6. Next, the flexible tank 61 of the main busbar end cover 60 on the expansion side
After that, as shown in FIG. 4, the existing side main bus bar termination cover 6 is removed from the insulating spacer 2b, and it is taken out from between the shields 5 and 5'.

Next, after removing the existing main bus bar termination cover 6 and the expansion side main bus termination cover 60, as shown in FIG. A well-known attachment/detachment device 7 is attached to the system to connect the existing side and the expansion side.

As shown in FIG. 5, the attachment/detachment device 7 has a flexible tank 71. Stud 72. It is composed of a combination of a tank 73 and a detachable conductor 74. When installing this @detachment device 7, the flexible tank 71 is first contracted by the stud 72 and inserted between the insulating spacers 3b and 3b', and both ends of the detatchable conductor 74 are connected to the edge spacers 3b, 3b, respectively.
' and connect them to the embedded electrodes 2b and 2b/. Thereafter, the flexible tank 71 is extended using the stud 72 as shown in FIG.
Attach it to b/ and finish.

Therefore, in the CΩ method for increasing the line of a gas-insulated switchgear according to the present invention, when removing the main bus terminal cover 60 on the expansion side during the expansion process from FIGS. 1 to 5, as shown in FIG. Since the flexible tank 6φ is contracted, the distance between the existing shield 5 and the additional shield 5' may be any size that allows the deflated flexible tank 60 to be taken out. In addition, as shown in FIG.
Since the distance between the two shields 5° and 5' is sufficient to allow the passage of the main bus bar end cover 6, the distance between the two shields 5° and 5' may be sufficient.

In any case, the pitch between the existing line and the expansion line of the gas insulated switchgear of the present invention is determined by the distance between the expansion side shield 5' and the existing bus bar termination cover 6. Dimensions are for expansion side bus bar end cover 60 and flexible tank 6
It is only necessary that removal is possible in the contracted state of 1, and there is no need to consider the handling allowance when removing the bus bar end covers 6, 6' as in the conventional case. The pitch between both lines may be determined by satisfying electrical and R quantity considerations.

Furthermore, in carrying out the line expansion method for a gas insulated switchgear according to the present invention, from the expansion installation work of the expansion side main bus bar termination section A' shown in FIGS. 1 to 3 until the expansion side main bus termination cover 60 is taken out. , there is no need to stop power supply to the existing line.

When removing the existing main bus bar end cover 6 and inserting and assembling the attachment/detachment device 7 in FIGS. 4 to 5, it is necessary to stop the power supply to the existing bus bar. As described above, in the method of the present invention, the expansion line can be installed without causing a power outage to the existing line.

Operation tests, commercial frequency withstand voltage tests, etc. can be conducted.

Next, another embodiment of the method for adding lines to a gas insulated switchgear according to the present invention will be described with reference to FIGS. 6 to 10.

First, FIG. 6 shows the structural relationship between the existing main bus terminal A and the expansion main bus terminal A' of a gas insulated switchgear to which the line extension method of the present invention is applied. In this embodiment, the busbar end cover 64 of the main busbar end A' on the expansion side is a combination of a large-diameter tank 65 and a large-diameter flat plate 66 that are larger in outer diameter than the busbar end cover 6 of the existing main busbar end A'. When an extension is installed, it is attached to the end face of the trackside spacer 3b' and surrounds the shield 5' as shown in the figure.

A method for adding lines to a gas insulated switchgear according to another embodiment will be described with reference to FIGS. 6 to 10. When installing the extension side main busbar at end A' with respect to the existing side main busbar terminal end A, as shown in Fig. 6, trackside spacer 3 b/
A bus bar end cover 64 is attached to the busbar end cover 64 to surround the shield 5'.

Next, as shown in FIG. 7, the large-diameter flat plate 66 of the busbar end cover 64 of the main busbar end A' on the expansion side is removed. After that, after releasing the fastening relationship between the large-diameter tank 65 and the insulating spacer 3b/, the large-diameter tank 65 is placed outside the main bus bar end cover 6 at the main bus bar end portion A on the existing side, as shown in FIG. Move while stacking. Furthermore, after the movement of the main bus end cover 6 is completed, as shown in FIG. The shields are taken out from between the two shields 5 and 5' in a stacked state as shown in the figure.

After this, connect both shields 5 and 5' to both embedded electric microphones 2b and 2b.
After removing from ', both paper edge spacers 3 b, 3
The attachment/detachment device 7 is inserted between b' and connected.

This attachment/detachment device 7 includes a telescopic flexible tank 1 and a stud 7.
2 and a detachable conductor 74. When installing the attaching/detaching device 7, first, the flexible tank 71 is contracted using the stud 72, and both ends of the attaching/detachable conductor 74 are connected to the embedded type ffs 12b and 2b', respectively. Thereafter, the flexible tank 71 is extended using the studs 72 and fixed to the end faces of the paper edge spacers 3b, 3b', thereby completing the process.

Therefore, the line pitch between the existing line and the expansion line in this embodiment also corresponds to the distance between the shield 5 of the existing main bus termination A and the shield 5' of the expansion main bus termination A'. The distance between the two shields 5, 5' may be set to a size that allows the main bus bar end cover 6 and the large diameter tank 65 to be stacked and taken out as shown in FIG. It is not necessary to set the distance between the busbar end covers 6, 6' and the removal allowance for the cover, but it is sufficient to set the dimensions to satisfy electrical and mechanical verification matters.

Furthermore, during the installation work of the expansion side bus bar end portion A' in FIG. 6 and from the flexible tank 65 of the bus bar end cover 64 in FIG. Until the diameter flat plate 66 is removed, the power supply to the existing busbar terminal end A can be carried out without stopping. 8th to 10th
From the time when the flexible tank 65 and the busbar end cover 6 are removed until the attachment/detachment device 7 is attached, the power supply to the existing busbar end portion A is stopped.

[Effects of the Invention] As described above, according to the present invention, by using a special cover for the busbar end cover of the main busbar end on the expansion side,
During line expansion work, the expansion side bus termination cover can be retracted or the large-diameter tank can be overlapped with the existing side bus termination cover and easily taken out from between the shields at both line ends, reducing the pitch between the two lines. There is no need to make the gas insulated switchgear larger than the dimensions determined from electrical and structural aspects, and it is possible to prevent the gas insulated switchgear from becoming larger and to minimize power outages to the existing side line during installation work.

[Brief explanation of the drawing]

1 to 5 are cross-sectional views showing one implementation state of the existing main bus bar termination portion and the expansion side main bus termination portion, respectively, for explaining the line extension method for gas insulated switchgear according to the present invention; 10 through 10 are cross-sectional views showing other embodiments for explaining the line extension method for gas insulated switchgear according to the present invention, and FIG. 11 is a conventional main bus termination on the existing side and the main bus on the expansion side. FIG. A... Existing side main bus bar terminal part A'... Expansion side main bus bar terminal part 1... Existing side main bus bar tank 1'... Expansion side main bus bar tank 3 a, 3 b, 3 c...・Existing side insulating spacers 3a', 3b', 3c'...Extension side insulating spacer 4...Existing side internal conductor 4'...Existing side internal conductor 5...Existing side electric field mitigation shield 5'・...Expansion side electric field mitigation shield 6...Existing side main bus bar end cover 6'...Extension side main bus end cover 7...Attachment/detaching device 71...Flexible tank 72...Stud 74 ... Detachable conductor 60 ... Expansion side main bus bar end cover 61 ... Flexible tank 62 ... Flat plate 63 ... Stud (8733) Agent Patent attorney Yoshiaki Inomata (Baka)
1 person) No. 11 No. 2 Zusu zuhama zu ε Δ Government servant

Claims (2)

[Claims] (1) When adding an additional side line to the existing side line where an electric field mitigation shield is attached to the end of the main bus on the existing side of the gas insulated switchgear and the main bus end cover is wrapped around it,
First, wrap the electric field mitigation shield provided at the end of the main bus on the expansion side with a main bus end cover made of a flexible tank.
After the expansion side main bus bar termination section is installed, the tank of the expansion side main bus bar termination section cover is deflated, and then taken out from between the existing side main bus bar termination section cover and the expansion side shield, and then the existing side main bus bar termination section is removed. Gas insulation characterized in that after removing the cover and the shields on both sides, a detachable device is inserted between the end of the main bus on the existing side and the end of the main bus on the expansion side, and the lines on both sides are interconnected by the detachable conductor. How to add lines to switchgear. (2) When adding an additional line to the existing line, which has an electric field mitigation shield attached to the end of the main bus on the existing side of the gas-insulated switchgear and wrapped around it with a main bus end cover,
First, the area around the electric field mitigation shield provided at the end of the main busbar on the expansion side is constructed using a combination of a large-diameter tank having a diameter larger than the outer diameter of the cover at the end of the main busbar on the existing side, and a large-diameter flat plate that closes the opening. Wrap with ivy extension side main bus bar end cover,
After the installation of the expansion side main busbar termination section, the large diameter tank of the expansion side main busbar termination section cover is moved and overlapped with the existing side main busbar termination section cover, and then the overlapped large diameter tank and the existing side main busbar termination section cover are moved. Remove the busbar termination cover from between the existing side shield and the expansion side shield, and then remove the existing side shield and the expansion side shield, and then install the attachment/detachment device between the existing side main busbar termination and the expansion side termination. A method for adding lines to a gas-insulated switchgear, which comprises inserting a conductor and interconnecting lines on both sides with a detachable conductor.