JP2001177932A - Gas-insulation switching device and withstand voltage testing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain gas-insulation switching device, capable of performing repair work and withstand voltage test, by only stopping one overhead line and a withstand voltage testing method therefor. SOLUTION: This gas-insulation switching device 1, having a line unit 7 connected to the main bus-bars 2, 3 thereof and a bushing 14, whose one end is connected to the line unit and whose other end is with two or more overhead lines 8 in the air, comprises a detachable conductor 41, disposed in a support container 35 of the bushing, so as to be detachable to an energizing path at a connecting part between the bushing 14 and the line unit 7, a grounding switch 6B, connected to a conductor on the side closer to the overhead lines than the detachable conductor and having an induced-current switching ability, and a mounting part 12B of a testing bushing 34, formed on a line-side disconnector 12 or a container 12A for a branch bus-bar 13 which is disposed in the line unit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear used in an electric station such as a substation connected to an overhead power transmission line, and a withstand voltage implemented when a failure occurs and repair is performed. It relates to the test method.

[0002]

2. Description of the Related Art FIGS. 14 and 15 show, for example, Mitsubishi Electric Technical Report Vol. 69 ・ No. 10 is a single-line diagram of a conventional gas-insulated switchgear described in “1000 kv Gas-Insulated Switchgear” by Yoshifumi Yamagata et al., Pp. 27-34, 1995, and a side view of the appearance. In these figures, reference numeral 1 denotes a gas insulated switchgear used in an electric station such as a substation, and is constituted by the following units and devices. That is, 2 and 3 are main buses, 4 and 5 are bus-side disconnectors connected to each main bus, and 6A is a ground switch. Reference numeral 7 denotes a line unit of the gas insulated switchgear connecting the main bus and the overhead line 8, and the figure shows a case of two lines. Each of the illustrated line units 7 has the same configuration, and includes the devices described below. That is, 9 is a connection bus connected to the bus-side disconnectors 4 and 5, 10 is a circuit breaker, 11 is a current transformer mounted on the connection bus on both sides of the circuit breaker, and 12 is a line-side disconnector. The earthing switch 6A is connected to the switch side, and the earthing switch 6B having inductive current switching ability is connected to the line side.

Reference numeral 13 denotes a branch bus connected to the line-side disconnector, and reference numeral 14 denotes a bushing connected to the branch bus, which is connected to the overhead line 8 via a drop-in line 8A (FIG. 16). Fifteen
Is an arrester connected to the branch bus 13, and 16 is a voltage transformer. In addition, 17 is a termination tower, 17A is an insulator,
18 is an overhead ground wire, 19 is a ground wire connected to the overhead wire 8,
Reference numeral 20 denotes an induction current switch connected to a ground line, 21 denotes a withstand voltage test device described later, and 22 denotes an application line for connecting the withstand voltage test device and the bushing 14. Further, 23 is a transformer unit of a gas insulated switchgear connecting the main bus and the transformer 24, and 25 is a gas insulated switchgear connected to the secondary side of the transformer. Note that each of the illustrated transformer units 23
Have the same configuration and are equipped with the devices described below. That is, 26 is a connection bus connected to the bus-side disconnectors 4 and 5, 27 is a circuit breaker, 28 is a current transformer mounted on the connection bus on both sides of the circuit breaker, 29 is a grounding switch, 3
Reference numeral 0 denotes a branch bus connecting the circuit breaker 27 and the transformer 24. 31 is a bus connection unit, and 32 and 33 are bus division units.

Next, the operation of the conventional gas insulated switchgear will be described. 14 and 15, the circuit breaker 10, the line-side disconnector 12, which is a component of the line unit 7,
When a fault such as a ground fault occurs inside the containers such as the branch bus 13, the lightning arrester 15, and the voltage transformer 16, the faulty line unit 7 is stopped, and repair such as replacement of the faulty component device is performed. After the repair, a withstand voltage test is performed to check the soundness. Hereinafter, the procedure will be described. Track unit 7
In the case of a failure between the bushing 14 and the circuit breaker 10, after repairing, the service line 8 A of the overhead line 8 is removed, and the withstand voltage test device 21 is connected to the bushing 14 via the application line 22 as shown in FIG. In addition to the connection, the bus-side disconnectors 4 and 5 are opened, and a predetermined high voltage is applied from the withstand voltage test device 21 in a state where the grounding switch 6A on the main bus side is closed, thereby confirming the soundness after repair. Done.

[0005]

In the above-mentioned conventional gas insulated switchgear, since the two overhead lines 8 are mounted on the two-line tower 17, the drop line 8A of the overhead line 8 and the bushing 14 are connected to each other. In order to separate the overhead line 8, it is necessary to prevent electrostatic induction and electromagnetic induction from the adjacent line to the overhead line 8, and it is necessary to stop the adjacent line. Further, in the case of a long overhead wire 8 of 500 kv or more, grounding as a measure for guiding from a distant place is necessary.
9 and an inductive current switch 20 for inductive current switching. In addition, a large crane truck for performing work at a high place is required, and a high cost and a long work time are required for removing the drop wire 8A. That is,
There has been a problem that both overhead lines must be stopped and expensive and large-scale work at high places is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a gas-insulated switchgear capable of performing a repair and a withstand voltage test only by stopping one overhead line and a withstand voltage test thereof. The aim is to provide a method.

[0007]

A gas insulated switchgear according to the present invention has a line unit connected to a main bus of the gas insulated switchgear, one end of which is connected to the line unit, and the other end of which has two or more lines. In a gas-insulated switchgear having a bushing connected in the air to an overhead wire, a detachable conductor detachably provided in an energizing path at a connection portion between the bushing and the line unit in a bushing support container, A grounding switch connected to the conductor on the overhead wire side and having an inductive current switching ability, and a mounting portion for a test bushing formed in a line-side disconnector or a branch bus container provided in the line unit. .

The gas insulated switchgear according to the present invention also includes a line unit connected to the main bus of the gas insulated switchgear, and an overhead line having one end connected to the line unit and the other end having two or more lines. In a gas-insulated switchgear having a bushing connected therein, a transformer unit connected to the main bus, and a transformer connected to the transformer unit,
In the container that houses the transformer bushing provided in the transformer, the detachable conductor and the branch bus container that are removably provided in the current path at the connection between the branch busbar and the transformer bushing provided in the transformer unit. It has a mounting portion for the formed test bushing.

The gas insulated switchgear according to the present invention also includes a line unit connected to the main bus of the gas insulated switchgear via a bus-side disconnector, one end of which is connected to the line unit and the other end of which is connected to the main unit. In a gas insulated switchgear having a bushing connected to an overhead line more than a circuit in the air, a main bus is composed of a plurality of section buses, and is provided detachably between each section bus, and electrically connects adjacent section buses. And a mounting portion for a test bushing formed in a container of the bus-side disconnector which can be electrically connected.

In the gas insulated switchgear according to the present invention, the insulating tube of the test bushing is constituted by a composite insulator tube in which a weather-resistant cover made of silicon rubber is provided on the outer surface of a tube made of fiber reinforced synthetic resin. It is.

[0011] A withstand voltage test method for a gas insulated switchgear according to the present invention is directed to a gas insulated switchgear in which a test bushing mounting portion is formed in a line-side disconnector or a branch busbar provided in a line unit. The test bushing to which the withstand voltage test device is connected is provided in the mounting part, the conductor of the test bushing is connected to the line-side disconnector or the branch bus, and the detachable conductor is removed. A predetermined high voltage is applied via a bushing.

A withstand voltage test method for a gas insulated switchgear according to the present invention is further provided in a gas insulated switchgear having a test bushing mounting portion formed in a branch bus container provided in a transformer unit. A test bushing to which the voltage test device is connected is provided on the mounting portion, the conductor of the test bushing is connected to the branch busbar, and the detachable conductor is removed. A voltage is applied.

According to the present invention, there is provided a gas insulated switchgear with a withstand voltage test method, wherein a test bushing mounting portion is formed in a container of a bus-side disconnector. The test bushing to be connected is provided in the mounting portion, the conductor of the test bushing is connected to the bus-side disconnector, and one or more sets of detachable conductors provided on the main bus are removed. A predetermined high voltage is applied via a test bushing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a single-line diagram for explaining a withstand voltage test method of a line unit of the gas insulated switchgear according to this embodiment. FIG. 2 is a side view of the appearance of the line unit and the test device shown in FIG. Is
FIG. 4 is a cross-sectional view showing the configuration of the bushing in the support container,
FIG. 5 is a cross-sectional view showing a state in which the detachable conductor in FIG. 3 is removed and the grounding switch on the line side is closed, and FIG. 5 is a cross-sectional view showing a configuration of a test bushing mounting portion. Since the configuration of the entire gas insulated switchgear is the same as that of the conventional gas insulated switchgear shown in FIG. 14, description will be made with reference to this drawing. FIGS. 1 and 2 show the connection state between the line unit 7 and the withstand voltage test device in FIG.

In these figures, 2 and 3 are main buses, 4 and 5 are bus disconnectors connected to each main bus, and 6A
Is a ground switch, 9 is a connection bus connected to the bus-side disconnectors 4 and 5, 10 is a circuit breaker, 11 is a current transformer mounted on the connection bus on both sides of the circuit breaker, and 12 is a line-side disconnector. The grounding switch 6A is connected to the circuit breaker side, and the grounding switch 6B having the induced current switching capability is connected to the line side. Reference numeral 13 denotes a branch bus connected to the line-side disconnector, and reference numeral 14 denotes a bushing connected to the branch bus. The bushing is connected to the overhead line 8 via a drop line 8A. 15 is an arrester connected to the branch bus 13, 1
Reference numeral 6 is a voltage transformer. Also, 17 is a termination tower,
17A is an insulator, 18 is an aerial ground wire, 21 is a withstand voltage test device described later, 34 is a test bushing, and 22 is an application line connecting the withstand voltage test device 21 and the test bushing 34.

FIG. 3 shows a configuration in which the device according to this embodiment is mounted in a support container 35 of the bushing 14. In this figure, 14A is a bushing insulator tube, 14B is a bushing conductor, 14C is a bushing terminal, 14D is a shield, 6B is a grounding switch provided in the supporting container 35 and having an induced current switching ability, 6B
A is a movable contact, 6BB is a fixed contact, and is fixed to the lower end of the conductor 14B of the bushing. 36 is a shield conductor provided at the lower end of the bushing conductor 14B, 37 is a conductor connecting the shield conductor 36 and the zinc oxide element 15A of the lightning arrester 15, 38 is a conical insulating spacer supporting the conductor 37, 13A is The container of the branch bus 13 connected below the support container 35, 13B is a conductor of the branch bus 13, 39 is a conical insulating spacer supporting the conductor 13B, and 40 is provided on the conductor 13B of the branch bus in the support container. Shield conductors 41 are shield conductors 36 and 4
A detachable conductor which is detachably mounted between the conductors and forms a current path between the bushing conductor 14B and the branch bus conductor 13B;
Reference numeral 42 denotes a hand hole for attaching and detaching the detachable conductor.

FIG. 5 shows a state in which the test bushing 34 is mounted on the mounting portion 12B formed at the upper end of the container 12A of the line-side disconnector 12 during the withstand voltage test. In this figure, 12 is a line-side disconnector, 12
A is the container, 12C is the movable contact, and 12D is a shield conductor, which is connected to the high voltage conductor 13B of the branch bus 13 connected to the circuit breaker 10. 13A is branch bus 1
A container 3 and a conical insulating spacer 39 for supporting the conductor of the branch bus 13 are shown. 12E is a line-side disconnector 12
, Fixed contactor, 12F is a shield conductor, bushing 1
4 is connected to the high-voltage conductor 13B of the branch bus 13 connected to the branch bus 4.

Reference numeral 13A denotes a container of the branch bus 13, and 39 denotes a conical insulating spacer for supporting the conductor of the branch bus 13.
Reference numeral 34 denotes a test bushing mounted on the mounting portion 12B, and reference numeral 34A denotes its insulating cylinder, which is a fiber-reinforced synthetic resin (F
It is configured as a composite insulator tube in which a silicon rubber weatherproof cover is provided on the outer surface of a tubular body made of RP). Reference numeral 34B denotes a conductor of a test bushing, and the insertion conductor 34C at the lower end is inserted and fixed to the shield conductor 12D of the line-side disconnector 12.
34D is a terminal of the conductor 34B, 34E is an upper cover,
F is a lower cover, 34G is an air shield, and 34H is a gas shield.

Next, the operation of this embodiment will be described. 1 to 5, a circuit breaker 10, a line-side disconnector 12, a branch bus 13, which are components of the line unit 7,
When a fault such as a ground fault occurs inside the container such as the surge arrester 15 and the voltage transformer 16, the faulty line unit 7 is stopped, and repair such as replacement of the faulty component device is performed. After repair,
A withstand voltage test is performed to check soundness. Hereinafter, the procedure will be described. Bushing 1 of track unit 7
In the case of a fault between the circuit breaker 4 and the circuit breaker 10,
3 and 4, the detachable conductor 41 in the support container 35 of the bushing 14 is not removed.
And disconnect the grounding switch 6B and disconnect the disconnector 1
2, a test bushing 34 is attached to the attachment portion 12B formed on the upper part of the container 12A, and as shown in FIG. 10. Main bus side disconnector 4,
5 is opened, the grounding switch 6A on the main bus side is closed, and a predetermined high voltage is applied from the withstand voltage test device 21 arranged near the line unit 7, thereby confirming the soundness after repair. Will be

The withstand voltage test device 21 is a device capable of generating a high voltage such as a lightning impulse, a switching impulse, a vibrating impulse, a commercial frequency, or the like. By setting the withstand voltage test value from the withstand voltage test device 21 to a low value, it is possible to reduce the size of the detachable portion including the detachable conductor 41 and the withstand voltage test device 21 itself. At this time, the line adjacent to the overhead line 8, the line unit of the adjacent line, the main buses 2, 3 and other units remain operating, and are not affected by the withstand voltage test after repairing the failed line unit 7. . On the other hand, bushing 1
4, the shield conductors 36 and 40 arranged in the support container 35 are supported by conical insulating spacers 38 and 39,
A detachable conductor 41 is provided between the shield conductors so that the detachable conductor 41 can be removed and attached from the handhole 42 by bolt connection or the like. The shield conductor 36 is provided with a contact for connecting the conductor 14B of the bushing 14 and a fixed contact for the ground switch 6B.
As shown in FIG. 4, the overhead line 8 is grounded. The space between the shield conductors 36 and 40 is shaped to withstand the high voltage from the withstand voltage test device 21. Therefore, there is no need to remove the drop line 8A of the overhead line 8 during the withstand voltage test, and it is not necessary to stop the adjacent overhead line. That is, the grounding work can be easily performed by providing the grounding switch 6B capable of switching the induced current.

The test bushing 34 made of composite porcelain attached to the attachment portion 12B formed on the upper portion of the container 12A of the line-side disconnector 12 is lightweight and has a length h2 ( FIG. 2) shows the bushing 14
Since the length can be made shorter than the length h1, not only the container 12A of the disconnector but also the branch busbar 13 can be easily mounted by providing a mounting portion at the vertically arranged portion of the container. The length of the test bushing 34 is 4 m or more when the voltage is high, so that the load due to wind and rain may increase. Therefore, the test bushing 34 is usually attached to the top of a vertically arranged container fixed to the foundation concrete. However, the insulation tube of the test bushing 34 made of a composite insulator is an insulation tube made of fiber reinforced synthetic resin (FRP) on the inside and a weatherproof cover made of silicon rubber on the outside, and has excellent short-term insulation performance. In addition to the features described above, since it is lightweight, it is possible to easily attach and detach the gas insulated switchgear to and from the container by working with a small tow truck having a small height.

In FIG. 5, if the disconnector 12 is closed, a withstand voltage test of the long branch bus 13 on the line side can be performed, and if the disconnector 12 is opened, a high voltage test on the circuit breaker 10 side is performed. be able to. Further, as shown in FIGS. 2 to 4, since the grounding switch 6 </ b> B having an inductive current switching capability is provided in the support container 35 of the bushing 14 and grounded, the test voltage is applied between the shield conductors 36 and 40. And the occurrence of a high voltage due to the superposition of voltages due to induction from other lines can be prevented, and the distance between the shield conductors 36 and 40 can be reduced, so that the detachable portion can be made small and economical. . The grounding switch 6B is also effective in preventing damage to the withstand voltage test device 21 itself due to intrusion of a lightning surge from the overhead line 8 during the withstand voltage test. In the withstand voltage test by applying a voltage from the test bushing 34, the high voltage application range can be limited to a narrow range such as the circuit breaker 10, the line-side disconnector 12, the bus-side disconnectors 4, 5, and the like. In addition, the capacity of the withstand voltage test device 21 can be reduced, and the withstand voltage test cost after repair can be reduced. In addition, when the test bushing 34 is attached, if the container is vertically arranged and an attaching portion is provided at the upper end thereof, the attaching work is easy. Therefore, in the track unit 7, the container such as the disconnector 12 is preferably arranged vertically. .

After the withstand voltage test of the line unit 7 is performed, the test bushing 34 is removed, the detachable conductor 41 in the bushing support container is attached, the state returns to the original state, and the operation of the line unit 7 is restarted. The above withstand voltage test is
The present invention can be carried out not only after repair but also for checking the soundness of the gas-insulated switchgear after 20 to 50 years from operation. The lightning arrester 15 and the voltage transformer 1
6 is connected to the conductor on the bushing 14 side with respect to the detachable conductor 41, but the line side disconnector 1 is connected to the detachable conductor 41.
The same effect can be obtained by connecting to the two conductors. In the case of a failure inside the container of the lightning arrester 15 and the voltage transformer 16, after repair, the detachable conductor 41 is removed, the grounding switch 6B is closed, and the withstand voltage test is performed through the test bushing 34 in the same manner as described above. be able to. In addition,
In this embodiment, the description has been made on the assumption that the line unit 7 is a phase-separated gas-insulated switchgear, but the same effect can be obtained as a three-phase collective gas-insulated switchgear. The detachable conductor 41 may be replaced with a manual disconnector or a simple disconnector. In this case,
The trouble of gas recovery is not required, and the work can be performed in a shorter time.

Embodiment 2 FIG. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a single-line diagram for explaining a withstand voltage test method of the transformer unit of the gas insulated switchgear according to this embodiment. FIG. 7 is a side view of the appearance of the transformer unit and the test device shown in FIG. FIG. 8 is a cross-sectional view showing the configuration of the state of attachment of the detachable conductor, and FIG. 9 is a sectional view showing the state of detachment of the detachable conductor and the state of attachment of the test bushing in FIG. The configuration of the entire gas insulated switchgear is the same as that of the conventional gas insulated switchgear shown in FIG. FIG. 6 and FIG.
15 illustrates a connection state between the transformer unit 23 and the withstand voltage test device in FIG. 14. In these figures, 2
And 3 are main buses, 4 and 5 are bus-side disconnectors connected to each main bus, 6A is a ground switch, 23 is a main bus and a transformer 2
4 is a transformer unit of the gas insulated switchgear which connects to No.4. Each of the illustrated transformer units 23 has the same configuration, and includes the devices described below. That is, 26 is a connection bus connected to the bus-side disconnectors 4 and 5, 27 is a circuit breaker, 28 is a current transformer mounted on the connection bus on both sides of the circuit breaker, 29 is a ground switch, and 30 is a circuit breaker. 27 is a branch bus connecting the transformer 27 and the transformer 24.

30A is a branch bus container, 30B is a high-voltage conductor, 30C, 30D, 30E and 30F are shielded conductors,
30G is a conical insulating spacer, 24A is a bushing for a transformer, 24B is a bushing shield, 43 and 44 (FIGS. 8 and 9) are shield conductors supported by the conical insulating spacer 30G and the like, and 45 is between the shield conductors 43 and 44. A detachable conductor 46 is detachably attached to the shield conductor 44 and the bushing shield 24B. A detachable conductor 46 is detachably attached between the shield conductor 44 and the bushing shield 24B. 47 is a conductor between the transformer bushing 24A and the shield conductor 43. Container to cover,
48 is a lightning arrester.

Next, the operation of this embodiment will be described. The circuit breaker 27, the branch bus 30, the lightning arrester 48, and the detachable conductor 4, which are the components of the transformer unit 23 shown in FIGS.
When a fault such as a ground fault occurs inside the container such as 5, 46, etc., the faulty transformer unit 23 is stopped, and repair such as replacement of the faulty component device is performed. After the repair, a withstand voltage test is performed to check the soundness. In the event of a failure between the transformer bushing 24A of the transformer unit 23 and the circuit breaker 27, the detachable conductor 45 located at the tip of the transformer bushing 24A is removed, and the vertically arranged container 3 of the branch bus 30 is removed.
9A, a test bushing 34 is attached as shown in FIG. Opening, closing the grounding switch 6A on the main bus side, and applying a predetermined high voltage from the withstand voltage test device 21 arranged near the transformer unit 23, confirms the soundness after repair. . Since the neutral point of the winding of the transformer 24 is grounded, and the secondary and tertiary sides of the transformer are also grounded, the bushing 2
It is not necessary to ground the tip of 4A. If necessary, a grounding device may be provided.

The withstand voltage test device 21 is a device capable of generating a high voltage such as a lightning impulse, an oscillating impulse, and a commercial frequency. At this time, the adjacent line, the line unit of the adjacent line, the adjacent transformer unit, the main buses 2, 3 and other units are kept operating, and the influence of the withstand voltage test after repairing the failed transformer unit 23 is considered. I do not receive. in this case,
The shield conductor 44 is provided with a contact portion connected to the lightning arrester 48. When the transformer unit 23 is repaired, as shown in FIG. 9, the shield conductor 44 is connected to the lightning arrester 48, and between the shield conductors 44 and 43. Since it can withstand the high voltage from the withstand voltage test device 21, there is no need for the withstand voltage test using the bushing 14 by removing the drop wire 8A of the overhead line 8, and it is not necessary to stop the adjacent overhead line. Therefore, the above-described withstand voltage test can be easily performed.

A test bushing 34 made of a composite insulator tube
As shown in FIG. 9, is attached to the upper mounting portion of the container 30A vertically arranged of the branch bus 30, the conductor 34B of the test bushing 34 is connected to the shield conductor 30F of the branch bus 30, The test bushing 34 made of a composite insulator is lightweight and does not consider salt damage.
Since the length is shorter than the length of the bushing 14, not only the vertically arranged container 30A fixed to the foundation concrete of the branch busbar 30 but also the vertically arranged container in other parts of the branch busbar 30 can be easily formed. Can be attached. In addition, the insulating cylinder of the test bushing 34 made of a composite insulator is a fiber-reinforced synthetic resin (FRP) insulating cylinder on the inside and a weatherproof cover made of silicon rubber on the outside. Therefore, the installation and removal of the composite bushing-made test bushing 34 can be easily performed by work using a tow truck having a low height.

In the withstand voltage test by applying a voltage from the test bushing 34, the high voltage
7. Since it can be restricted to a narrow range such as the bus-side disconnectors 4 and 5, the capacity of the withstand voltage test device 21 can be reduced, and the withstand voltage test cost after repair can be reduced. Further, when the test bushing 34 is attached, if the container is vertically arranged and an attaching portion is provided at the upper end thereof, the attaching operation is easy. Therefore, in the track unit 23, it is preferable that the branch bus container is vertically arranged. A withstand voltage test performed after a failure occurs in the lightning arrester 48 and replacement and repair is performed is performed with the detachable conductor 46 attached to the detachable conductor 45.
Removed and carried out. Thus, the withstand voltage test can be easily performed even if the lightning arrester 48 itself fails. After performing the withstand voltage test after repairing the transformer unit 23, the test bushing 34 is removed, the detachable conductor 45 and the like are attached, and the transformer unit 23 is returned to the original state, and the operation of the transformer unit 23 is restarted.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a single-line diagram for explaining a withstand voltage test method of the gas insulated switchgear according to this embodiment, and FIG. 11 is a configuration of a detached state of a detachable conductor provided on a main bus and an attached state of a test bushing 34. FIG. The configuration of the entire gas insulated switchgear is the same as that of the conventional gas insulated switchgear shown in FIG. In FIGS. 10 and 11,
Reference numerals 50, 51, 52, 53, and 54 denote detachable conductors provided detachably between the units of the main bus 3 to divide the main bus 3 into a plurality of section buses and electrically connect adjacent section buses. It can be connected or disconnected. 55,5
Reference numerals 6, 57, 58, and 59 denote detachable conductors similarly provided between the units of the main bus 2 so as to be detachable, and divide the main bus 2 into a plurality of section buses and electrically connect adjacent section buses. Or it can be separated.

2A is a container of the main bus 2, 2B1-2B6
Is a section bus of the main bus 2 divided by each detachable conductor, and FIG. 11 shows a part thereof. The same applies to the main bus 3, but the reference numerals in the figure are not given. 5
6A, 57A, 58A are shield conductors, 60 is a conical insulating spacer supporting each section bus, 4 is the main bus-side disconnector described above, 4A is its container, 4B is a test bushing formed at the upper end of the container. , 4C is a movable contact, 4D is a shield conductor, 4E is a fixed contact, and 4F is a shield conductor, which is coupled to each section bus. Further, a test bushing 34 is mounted on the mounting portion 4B at the upper end of the main bus-side disconnector 4 corresponding to the detachable conductor 57.

In such a configuration, if a fault such as a ground fault occurs inside the main bus 2 between the transformer unit 23 and the bus connection unit 31, the faulty main bus 2 is stopped and the faulty Repair such as replacement of equipment is performed. After the repair, a withstand voltage test is performed to check the soundness. First, the transformer unit 23 and the bus connection unit 3 shown in FIG.
The detachable conductors 58 and 57 provided inside the container 4A of the main bus-side disconnector 4 of FIG.
A test bushing 34 is provided on the mounting portion 4B on the upper part of the container of the main bus-side disconnector 4 as shown in FIG. By applying a high voltage to the repaired portion of the main bus 2 from the withstand voltage test device 21 in a state where each disconnector 4 is closed, the test is performed without removing the drop line 8A of the overhead line 8.

The portions between the shield conductors 4F and 58A and the portions between 4F and 57A where the detachable conductors 58 and 57 are removed are designed to withstand the high voltage. The other part of the main bus 2 to which no high voltage is applied is grounded by a grounding switch or a simple grounding device of another unit so that there is no influence of the withstand voltage test. At this time, the other main bus 3 has been operated. In the withstand voltage test by applying a voltage from the test bushing 34, the high voltage application range can be limited to a narrow range such as the disconnector of the bus connection unit 31 and a part of the main bus 2. By reducing the capacity of the test apparatus 21, it is possible to reduce the withstand voltage test cost after repair. The same effect can be expected even if the withstand voltage test for applying a voltage from the test bushing 34 is applied at the time of repairing the bus connection unit and the bus division unit in the same procedure as described above.

Embodiment 4 Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a single-line diagram for explaining a procedure of a withstand voltage test method of the gas insulated switchgear after repair of the main bus portion, and FIGS. 12 and 13 are cross-sectional views showing a configuration according to this embodiment. 12 shows a state where the detachable conductor is attached, and FIG. 13 shows a state where the detachable conductor is detached. The configuration of the entire gas insulated switchgear is the same as that of the conventional gas insulated switchgear shown in FIG. The feature of this embodiment is that, in FIG. 10, the detachable conductor provided in the disconnector container between the units of each main bus is provided at a different position from the disconnector container. FIGS. 12 and 13 exemplify the sections of the section buses 2B4 and 2B5 in the main bus 2. FIG. 58A and 61 are section buses 2B4 and 2B, respectively.
A shield conductor coupled to B5, which is provided at a different position from the line-side disconnector 4. 58 is a shield conductor 58A
And 61, a detachable conductor removably provided between 61 and 62, a container 62 for covering them, and 62A a handhole provided in the container 62.

In such a configuration, when a fault such as a ground fault occurs inside the main bus 2 between the transformer unit 23 and the bus connection unit 31, the faulty main bus 2 is stopped and the faulty configuration Repair such as replacement of equipment is performed. After the repair, a withstand voltage test is performed to check the soundness.
In this procedure, the detachable conductor 58 shown in FIG.
By the operation from A, it is removed as shown in FIG.
A test bushing 34 is provided on the mounting portion 4B (FIG. 11) of the main bus side disconnector 4 of the nearby unit above the container 4A, and the withstand voltage test device 21 connects the main bus 2 to the main bus 2 with the disconnector 4 closed. High voltage will be applied to the repaired part. Shield conductor 58 with detachable conductor 58 removed
The space between A and 61 can withstand the high voltage. The other part of the main bus 2 to which the high voltage is not applied is grounded by a grounding switch or the like so that the withstand voltage test is not affected. At this time, the other main bus 3
You are still driving. By providing the detachable conductor at a position different from the disconnector as in this embodiment, it is possible to reduce the size of the bus-side disconnector itself.

[0036]

According to the gas insulated switchgear of the present invention, a line unit connected to the main bus of the gas insulated switchgear, and one end connected to the line unit and the other end connected to two or more overhead lines. In the gas-insulated switchgear having a bushing connected in the above manner, a detachable conductor detachably provided in an energizing path in a connection portion between the bushing and the line unit in a bushing support container, a conductor on the overhead wire side from the detachable conductor And a grounding switch having an inductive current switching capability, and a test bushing attached to the line-side disconnector or branch bus container provided in the line unit. The voltage test can be easily performed.

The gas insulated switchgear of the present invention further comprises a line unit connected to the main bus of the gas insulated switchgear,
A bushing, one end of which is connected to this line unit and the other end of which is connected to two or more overhead lines, a transformer unit connected to the main bus, and a transformer connected to the transformer unit. In the gas-insulated switchgear having, in a container for housing a transformer bushing provided in the transformer,
Since there is provided an attaching / detaching conductor detachably provided on an energizing path in a connection portion between the branch bus bar provided in the transformer unit and the transformer bushing and a test bushing formed in the container of the branch bus bar, In the same manner as described above, the withstand voltage test after completion of the repair can be easily performed.

The gas insulated switchgear of the present invention also includes a line unit connected to the main bus of the gas insulated switchgear via a bus-side disconnector, one end of which is connected to the line unit, and the other end of which has two lines. In the gas insulated switchgear having a bushing connected to the overhead wire in the air, the main bus is composed of a plurality of section buses, and is provided detachably between the section buses to electrically connect adjacent section buses. It is possible to limit the voltage application range of the withstand voltage test because it has a detachable conductor that can be connected to the tester and a mounting portion for the test bushing formed on the container of the bus-side disconnector. The test apparatus can be reduced in size, and the withstand voltage test cost can be reduced.

In the gas insulated switchgear of the present invention, the insulating cylinder of the test bushing is constituted by a composite insulator tube in which a weather-resistant cover made of silicon rubber is provided on the outer surface of a cylindrical body made of fiber reinforced synthetic resin. It is possible to reduce the weight and size of the test bushing,
Removal work becomes easy.

According to the withstand voltage test method of a gas insulated switchgear of the present invention, a test bushing to which a withstand voltage test device is connected is provided on an attachment portion, and a conductor of the test bushing is connected to a line-side disconnector or a branch bus. Then, after removing the detachable conductor, a predetermined high voltage is applied from the withstand voltage test device via the test bushing, so that the withstand voltage test after the completion of the repair becomes easy to carry out, and at the time of the withstand voltage test, The stop range can be reduced.

According to the method for testing the withstand voltage of a gas insulated switchgear of the present invention, a test bushing to which a withstand voltage test device is connected is provided on a mounting portion formed on a container of a branch busbar, and a conductor of the test bushing is provided. Was connected to the branch busbar, and after removing the detachable conductor, a predetermined high voltage was applied from the withstand voltage test device via the test bushing. In addition to this, the stop range during the withstand voltage test can be reduced.

The withstand voltage test method for a gas insulated switchgear according to the present invention further comprises providing a test bushing to which the withstand voltage test device is connected at a mounting portion formed on a container of the bus-side disconnector, Is connected to the bus-side disconnector, and after removing one or more sets of detachable conductors provided on the main bus, a predetermined high voltage is applied from the withstand voltage test device via the test bushing. In addition, it is possible to limit the application range of the high voltage to a part of the main bus, and it is possible to reduce the size of the withstand voltage test device and reduce the test cost.

[Brief description of the drawings]

FIG. 1 is a single line diagram for explaining a withstand voltage test method of a line unit of a gas insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a side view of the appearance of the line unit and the test apparatus shown in FIG.

FIG. 3 is a cross-sectional view showing a configuration inside the support container of the bushing in the first embodiment.

4 is a cross-sectional view showing a state where a detachable conductor in FIG. 3 is removed.

FIG. 5 is a cross-sectional view showing a configuration of a test bushing attachment portion.

FIG. 6 is a single-line diagram for describing a withstand voltage test method for a gas-insulated switchgear according to Embodiment 2 of the present invention.

FIG. 7 is a side view of the appearance of the transformer unit and the test apparatus shown in FIG. 6;

FIG. 8 is a cross-sectional view showing a configuration in a state where a detachable conductor is attached.

9 is a cross-sectional view showing a detached state of a detachable conductor and an attached state of a test bushing in FIG. 8;

FIG. 10 is a single-line diagram for describing a withstand voltage test method for a gas-insulated switchgear according to Embodiment 3 of the present invention.

FIG. 11 is a cross-sectional view showing a detached state of a detachable conductor provided on a main bus bar and an attached state of a test bushing.

FIG. 12 is a cross-sectional view showing a configuration of a gas insulated switchgear according to Embodiment 4 of the present invention, showing a state where a detachable conductor is attached.

FIG. 13 is a cross-sectional view showing a configuration of a gas-insulated switchgear according to Embodiment 4 of the present invention, showing a detached state of a detachable conductor.

FIG. 14 is a single line diagram showing a configuration of a conventional gas insulated switchgear.

FIG. 15 is a side view of the appearance of a line unit of a conventional gas insulated switchgear.

[Explanation of symbols]

1 Gas insulated switchgear, 2, 3 main bus, 4, 5 bus side disconnector, 6A, 6B ground switch, 7 line unit, 9, 26 connection bus, 10, 27 circuit breaker, 12
Track side disconnector, 12A container, 12B mounting part, 1
3, 30 branch bus, 14 bushing, 21 withstand voltage test device, 23 transformer unit, 24 transformer, 24
A transformer bushing, 24B bushing shield,
34 test bushing, 34A composite insulator tube, 3
5 Support container, 41, 45, 46, 50 to 59 Detachable conductor, 43, 44 Shield conductor, 2B1-2B6 Classified bus.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kento Yanai 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 5G017 AA07 EE06 FF09

Claims (7)

[Claims] 1. A line unit connected to a main bus of a gas insulated switchgear, one end of which is connected to the line unit;
In a gas insulated switchgear having a bushing whose other end is connected to two or more overhead wires in the air, the bushing is detachably provided in an energizing path in a connection portion between the bushing and the line unit in a support container of the bushing. A detachable conductor, a grounding switch connected to the conductor on the overhead line side from the detachable conductor and having an inductive current switching capability, and a test bushing formed in a line-side disconnector or a branch bus container provided in the line unit. A gas-insulated switchgear, characterized by comprising a mounting portion for (1). 2. A line unit connected to a main bus of a gas insulated switchgear, one end of which is connected to the line unit,
In a gas-insulated switchgear having a bushing whose other end is connected to two or more overhead wires in the air, a transformer unit connected to the main bus, and a transformer connected to the transformer unit, In a container for accommodating a transformer bushing provided in the transformer, a detachable conductor detachably provided in an energizing path at a connection portion between the branch busbar provided in the transformer unit and the transformer bushing and the branch. A gas insulated switchgear comprising a test bushing mounting portion formed in a busbar container. 3. A line unit connected to a main bus of a gas-insulated switchgear via a bus-side disconnector, one end of which is connected to the line unit, and the other end of which is connected in air to two or more overhead lines. In the gas insulated switchgear having the bushing described above, the main bus is composed of a plurality of section buses, and is detachably provided between the section buses so that adjacent section buses can be electrically connected. A gas-insulated switchgear comprising a detachable conductor and a mounting portion for a test bushing formed in a container of the bus-side disconnector. 4. The insulating tube of the test bushing is a composite insulator tube in which a weather-resistant cover made of silicon rubber is provided on an outer surface of a tube made of a fiber-reinforced synthetic resin. 4. The gas-insulated switchgear according to claim 3. 5. The gas insulated switchgear according to claim 1, wherein a test bushing to which the withstand voltage test device is connected is provided on the mounting portion, and a conductor of the test bushing is connected to the line-side disconnector or the branch bus. A method for applying a predetermined high voltage from the withstand voltage test device via a test bushing after removing the detachable conductor, the withstand voltage test method for a gas insulated switchgear. 6. The gas insulated switchgear according to claim 2, wherein a test bushing to which a withstand voltage test device is connected is provided on the mounting portion, a conductor of the test bushing is connected to the branch bus, and a detachable conductor is removed. A method for applying a predetermined high voltage from the withstand voltage test device via a test bushing after the test. 7. The gas insulated switchgear according to claim 3, wherein a test bushing to which a withstand voltage test device is connected is provided on the mounting portion, and a conductor of the test bushing is connected to the bus-side disconnector, and the main bus is provided. The detachable conductor provided in
A withstand voltage test method for a gas insulated switchgear, wherein a predetermined high voltage is applied from the withstand voltage test device via a test bushing after removing one or more pairs.