JPS62107610A - 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 [Field of Industrial Application] The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

[Prior Art] A gas-insulated switchgear is constructed by housing equipment necessary for configuring a switching circuit, such as a circuit breaker and a disconnector, in a container sealed with SFG gas. For example, a gas-insulated switchgear having a two-line power receiving three-transformer bank configuration installed in a power distribution substation has the configuration shown in the single-line diagram of FIG. 9.

In Fig. 9, C)-1a1 is a cable head that leads the line, CBa is a circuit breaker, DSa1 to DSa4 are disconnectors, ESa1 to [:3a3 are earthing switches, and LA is a lightning arrester. One gas insulated switchgear unit 1 to AI' is housed in a sealed common box-shaped container 1 and connected to a transformer Tr1.

Further, the disconnectors DSb1 to [)3 b3 and the cable heads CHbl and CHb2 are housed in a common container 2 sealed with SF6 gas to form another gas insulated switchgear unit B- connected to the transformer Tr2. . Furthermore, a gas insulated switchgear unit A2° is provided which is connected to the transformer TR3 by equipment similar to the gas insulated switchgear unit Δ1°, and the units A1°, B- and A2° are laterally arranged and grounded, and the unit A1 ° Cable head CH
a2 and the cable head CHbl of unit B- are mutually connected by a cable, and the cable head CHb2 of unit B' and the cable head C1- of unit A2° are connected to each other by a cable.
1a2 are mutually connected by a cable.

The line cable L1 is drawn in by the cable head CHa1 of the unit A1°, and the line cable [2 is drawn in by the cable head CHa1 of the unit A2°.

[Problems to be Solved by the Invention] In the conventional gas-insulated switchgear of this type, the interrupting part and the disconnector of the circuit breaker were each supported by separate insulating supports, so there were many types of insulators. , there was a problem that the number of parts increased and the structure became complicated.

In addition, with conventional gas-insulated switchgear, each device is placed separately inside the container, and the devices must be assembled in a narrow space inside the container that houses the devices, making assembly extremely time-consuming. It was inevitable that the number of manufacturing steps would increase, leading to higher costs.

Furthermore, in conventional gas-insulated switchgear, a disconnector and a grounding switch, which is closed when the disconnector is disconnected, are provided separately, which increases the number of types of equipment and requires a disconnector operator and a grounding switch. It is necessary to provide both a controller and an operator, which poses a problem in that a large amount of space is required inside the container.

Furthermore, in the conventional gas insulated switchgear, the phases are only insulated by gas, so if an arc accident occurs in the container, there is a risk that it will progress to a three-phase short circuit accident. Therefore, in the conventional device, it is necessary to design the container to have high strength in anticipation of a pressure increase in the event of a three-phase short circuit accident, which has the problem of increasing the weight and cost of the container.

One object of the present invention is to provide a gas-insulated switchgear that has a simplified structure by reducing the number of parts by supporting the interrupting part of the circuit breaker and the disconnector by a common insulating support. .

Another object of the present invention is to provide a gas gas system that allows equipment to be assembled outside the container and then stored inside the container, so that assembly can be performed without having to perform assembly work in a narrow space inside the container. The purpose of the present invention is to provide an insulated switchgear.

Another object of the present invention is to provide a gas-insulated switchgear in which a movable contact of a disconnector and a movable snow shovel of a grounding switch are integrated, thereby making it possible to omit a movable element and an operating device of the grounding switch. There is a particular thing.

A further object of the present invention is to provide a gas insulated switchgear that prevents the occurrence of an arc accident in a container from progressing to a three-phase short circuit accident.

Means for Solving Problem C 1 The present invention provides a circuit breaker having a cut-off part in which a movable contact and a fixed contact are housed in a cut-off part container, a fixed side element having a fixed contact 1, and the above-mentioned. A pair of disconnectors each consisting of a movable element having a movable contact that moves toward and away from a fixed contact and electrically connected to both ends of the disconnection section, and a common outer housing that houses the disconnection section and the pair of disconnectors. A gas insulated switchgear equipped with a shell container is improved.

The invention in Box 1 is that a common insulating support is provided in the outer shell container for the cutoff section and the pair of disconnectors, and the cutoff section and the pair of disconnectors are supported on this insulating support. It is characterized by

In addition to the configuration of the first invention, the invention in Box 2 specifies the GJ structure for mounting the interrupter and the disconnector to the container. It is characterized in that the supporting insulating support is supported on the inner surface of a detachable plate that constitutes a part of the outer shell container.

The invention in Box 3 specifies, in addition to the configuration of the first invention, a structure in which a part of the disconnector is used to configure an earthing switch. , a fixed grounding electrode is provided on the side of the movable element of each disconnector, and a movable grounding electrode is provided on the movable element of each disconnector that contacts the fixed grounding electrode when the movable contact is displaced to the final disconnection position. We have established a department.

The invention in Box 4 of the present invention discloses a structure for further strengthening the insulation between phases in addition to the structure of the first invention in a three-phase gas insulated switchgear. Three equipment storage chambers partitioned by partition walls are provided in the body, the three-phase cutoff parts are stored in each of the three equipment storage chambers, and a pair of three-phase disconnectors are supported on the outside of the insulating support. . A shielding wall provided on the insulating support is interposed between each phase of the pair of three-phase disconnectors, and the shielding wall shields the phases of the disconnectors to strengthen the insulation.

The fifth invention of the present application specifies a structure for reinforcing mutual insulation in a three-phase gas-insulated switchgear. and a disconnector storage chamber for a pair of disconnectors,
A circuit breaker storage chamber for each phase and a disconnection/disconnection device storage chamber each contain a circuit breaker and a predetermined circuit breaker for each phase.

[Operation of the invention] When the circuit breaker and the disconnector are supported on a common insulating support as in the first to fifth inventions, the circuit breaker and the disconnector are each separately insulated and supported. Since there is no need to provide a stand, the structure can be simplified and assembly can be facilitated.

As in the second aspect of the invention, if the structure is such that the cutoff part and the disconnector are supported on a removable plate that forms a part of the outer shell container, the cutoff part and the pair of disconnectors are assembled to the plate in advance. Since the gas insulated switchgear can be assembled by attaching the plate to the outer shell container, the assembly work is easier than with conventional devices in which all equipment is assembled in a narrow space inside the container. I can do it.

In addition, as in the third invention, the movable side niremen (・
If a fixed grounding electrode is provided on the side of the grounding contact and a movable grounding electrode is provided on the movable contact, a grounding switch can be constructed using the components of the disconnector. Further, since a separate operating device for the earthing switch is not required, the structure of the device can be simplified and the device can be made smaller.

Furthermore, as in the fourth invention, if the disconnection part of each phase is arranged in an independent gas space and the mutual contact between the disconnectors is shielded by a shielding wall, a ground fault occurring in each phase will progress to a short circuit accident. Since this can be prevented, the reliability of the device can be improved.

In addition, by arranging both the cutoff section and the disconnector of each phase in independent gas spaces as in the fifth invention, it is further ensured that a ground fault occurring in each phase develops into a three-phase contact fault. can be prevented.

Therefore, according to the fourth or fifth invention, there is almost no need to consider the pressure increase inside the outer shell container in the event of a three-phase contact accident, so it is possible to design the outer shell container with lower strength than before. , it is possible to reduce the weight and cost of the device.

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

(a) Electrical configuration of the embodiment Figure 6 shows the configuration of each phase of the embodiment in which the present invention is applied to a gas-insulated switchgear with a two-line, three-transformer bank configuration. The opening/closing device is the first and second
first and second line side units A1 and A2 into which line cables Ll and L2 are drawn, respectively, and first to third transformers connected to the primary sides of first to third transformers Tr1 to Tr3. Primary side unit B1 to B3
It is composed of.

The first and second line-side units A1 and A2 include a cable head CHa1 that draws in the cable, and a lightning arrester LA connected to the live part conductor connected to the cable head CHa1.
and one end is connected to the cable head CH via the disconnector DSal.
A circuit breaker CBa connected to a1 and one end connected to circuit breaker CBa
It consists of a disconnector DSa2 connected to the other end, earthing switches ESa1 and E3a2 that ground both ends of the circuit breaker CBa, and an earthing switch ESa3 provided between the non-grounding side terminal of the lightning arrester LA and the ground. ing.

Further, the first to third transformer primary side units B1 to B3 have disconnecting switches DSb1 to D, each of which has one end connected in common.
S b3 and the cable head C1-1b1 connected to the other ends of the disconnectors D S b2 and D S b3, respectively.
and CHb2, and the other ends of the first to third transformer primary side units B1 to B3 [) 3 bl are connected to the first to third transformer Tri to Tr, respectively.
Connected to the primary side of 3.

The first and second line side units A1 and A2 are arranged side by side with the first and third transformer primary side units B1 and B3, respectively, and disconnect the first and second line side units. The other end of the transformer DSa2 is connected to a common connection point of the disconnectors D S bl to D S b3 of the first and third transformer primary units B1 and B3, respectively.

Further, the cable pen C)-1b2 of the first transformer primary unit B1 and the cable head C)-1bl of the second transformer primary unit B2 are connected by a cable C12, The cable head CHb2 of the next unit 820 and the cable head C1-1b1 of the third transformer primary unit B3 are connected by a cable C23. Then, the cable head C)lb2 of the third transformer primary unit B3 and the cable head C)-1b1 of the first transformer primary unit B1 are connected to the cable C1
3, thereby connecting the three transformer primary units in a loop.

With this configuration, the units B1 to B3 connected to the primary sides of the three transformers can have the same structure, and the first and second line side units h A 1 and A 2
Since both have the same structure, it is possible to standardize the EL of the unit and reduce the cost of the unit.

In addition, if three units B1 to B3 are connected in a loop as shown in Figure 6, if a fault occurs in any line, it is possible to restore the line once every 15 minutes using the FA2 transformer bank configuration. The time required for complete recovery can be shortened.

The units AI' and A2'' having the configuration shown in FIG.
Although it could not be used to construct a gas-insulated switchgear for a busbar system as shown in Figure 8 or Figure 8, it could be used to cut off the line side unit 5CBa and both ends of this circuit breaker as shown in Figure 6. A pair of disconnectors DSa1 and [)S connected to
a2, earthing devices ESa1 and ESa2, and cable head CHal (surge arrester LA may be omitted).
By using this line side unit, the seventh
Gas insulated switchgear with a single busbar configuration as shown in the figure,
It is also possible to configure a gas insulated switchgear with a double busbar configuration as shown in the figure, and it is possible to use a common line side unit for the gas insulated switchgear connected to the transformer and the gas insulated switchgear of the busbar system. can. In Fig. 7, 1 to A4 are line side units having the same configuration as the line side units shown in Fig. 6, BUS is a bus line, DSl, DSCl and D.
SC2 is a disconnector, C3cj, tm[rB, Trl and T
r2 is a transformer. Also, in Fig. 8, A1 and A2
is line side unit, DS1 and DS2 are disconnectors, Bus
l and BUS2 are the first and second busbars.

(B) First Specific Embodiment Referring now to FIGS. 1 and 2, the mechanical structure of an embodiment of the present invention is shown. Figure 1 shows the first line side unit A1 and the first transformer 1 shown in the middle line connection diagram of Figure 6.
The next unit 1-81 and the first transformer 5Trl are shown, and the line side unit A1 and transformer primary side unit B1 are mounted on frames 2 and 3, which are arranged side by side on the installation base 1, respectively. is supported by Transformer unit Tr
1 houses the main body of the transformer in a tank 4, which is installed on the back side of the transformer primary side unit B1. The configuration of each unit will be explained below.

(a) Configuration of line-side unit The line-side unit A1 stores predetermined equipment in a box-shaped outer shell container 5 supported on a pedestal 2.
The side plate 6 on the front side (right side in Figure 1) is removable, and the upper end corner on the back side (left side in Figure 1) of the outer shell container 5 has a side plate 6 at an angle of 45 degrees with respect to the vertical direction. A slanted wall portion 5a is formed.

An insulating support 7 is fixed to the side plate 6. The insulating support 7 is made of a molded product made of an insulating 81 resin such as epoxy resin that is not affected by 3F6 gas, and includes an outer frame portion 701 having a U-shaped cross section, a lower end of the outer frame portion 701, and a Fin-shaped shielding walls 702 each protruding from the outer surface of the upper end.
and 703, and device storage chambers 8 and 9 are configured inside and outside the outer frame portion 701, respectively.

The shielding walls 702 and 703 (see FIG. 2 for 703) are each set around two times at a predetermined interval in the direction 100 fr+ from the plane of the paper in FIG. It is interposed between the phases to strengthen the insulation between the phases. The equipment storage chamber 8 is open on the front side, and the side plate 6 is attached to airtightly close the opening of the equipment storage chamber 8 and the outer shell container 5.

The inside of the equipment storage room 8 is partitioned horizontally (
Three unit storage chambers 8 arranged in a direction (perpendicular to the plane of the paper in Figure 1)
It is divided into A. These three unit storage rooms care about each other! Each unit storage room constitutes an independent gas space.

In the three unit storage chambers 8A, the interrupting sections 10 of the three-phase circuit breaker CBa are accommodated, respectively, and are supported by the bottom surface of the partition wall section 702. Each interrupter 10 houses a fixed contact, a movable contact, and an arc extinguishing mechanism in a vertically cylindrical interrupter container 11 filled with SF6 gas. The Pannoor type compresses the panzer cylinder and sprays gas onto the arc when it is separated from the child, and the Pannor type uses the arc current to excite the arc drive coil and link the magnetic flux generated from the coil to the arc, thereby suppressing the arc. An arc rotating type that extinguishes the arc by rotating at high speed can be used. Terminal conductors 12 and 13 are provided at the upper and lower ends of the interrupter 10 and extend in the axial direction of the interrupter container 11 and are connected to the fixed contact and the movable contact in the container 11, respectively.
3 pass through the upper and lower walls of the outer frame 701 in an airtight manner and are led out to the upper and lower parts of the equipment storage chamber 9, respectively.

An operating shaft for operating a movable contact is led out from the lower part of the interrupter container 11, and an operating lever 15 is attached to this operating shaft. The outer surface of the side plate 6 has a circuit breaker drive mechanism section 17.
and an operating device 18 are installed vertically side by side. The drive mechanism section 17 has a mechanism that transmits a drive force to the operating lever 15 housed in a case, and the output shaft of this drive mechanism section 17 is an insulating link 19 that is provided by penetrating the side plate 6 in an airtight and slidable manner. It is connected to the operating lever 15 via. The operating device 18 uses electromagnetic force, spring force, fluid pressure, or the like as a driving force to apply an operating force to the cutoff section 10 via the drive mechanism section 17, and the output shaft of this operating device 18 is connected via a link (not shown). It is connected to the input shaft of the drive 17J1 structure 17.

A pair of disconnectors DSa1 and Q3a2 connected to both ends of the circuit breaker are housed in the lower and upper parts of the equipment storage chamber 9, respectively. The disconnector [ ) 3al is connected mechanically and electrically to the terminal conductor 13 at the lower end of the disconnection part 10 and is supported on the insulating support 7, and the movable element 20al has a center axis that is aligned with the center of the movable element 20a1. The fixed element 21a1 is disposed so as to coincide with the axis and supported at the lower end of the partition wall 702, and the disconnector DSa
Reference numeral 2 denotes a movable element 20a2 that is electrically and mechanically supported by the terminal conductor 12 at the upper end of the interrupting part 10 and supported with respect to the insulating support 7;
The partition wall portion 7 is arranged so as to coincide with the central axis of 0a2.
02, and a fixed side element 21a2 supported at the upper end of the fixed side element 21a2.

As described above, if the movable elements of the disconnectors DSa1 and Sa2 are mechanically connected to and supported by the terminal conductors 12 and 13 at both ends of the disconnection section, the connection between the disconnectors and the disconnection section is established. Since there is no need to separately provide a conductor for this purpose, the structure can be simplified.

Movable element 20a of disconnector DSa1 and Q3a2
A fixed electrode 2 for grounding is installed on each side of 1 and 20a2.
2a1 and 22a2 are arranged, and these grounding fixed electrodes connect their respective central axes to disconnectors DSa1 and DSa2.
It is attached to the side plate 6 so as to be aligned with the central axis of the.

As shown in FIG. 3, the movable elements 20a1 and 20a2 include a shield 23, a current collecting electrode 24 provided in the shield, and a rod-shaped movable contact 25 that movably contacts the current collecting electrode. It consists of Further, the fixed side elements 21a1 and 21a2 are composed of a shield 26 and a fixed contact 27 disposed within the shield 26 so that the movable contact 25 moves toward and away from the fixed contact 27.

Grounding rigid fixed voltage (~22a1 and 22a2 are shield 28
Two contacts are arranged inside, and the ends of the movable contacts 25 of the movable elements 20a1 and 20a2 of the disconnector serve as movable grounding electrodes that come into contact with and separate from this fixed grounding electrode.

An insulated operating rod 30 is attached to the end of the movable contacts 25 of the movable elements 20al and 20a2 on the grounding fixed electrode side, and moves around the inside of the grounding fixed electrode, and this insulating operating rod is provided on the side plate 6. It is freely supported by a bearing part with an airtight structure and led out.

An insulated operating rod 30 led out to the outside through the inside of the fixed grounding electrode 22a1 disposed on the lower side is connected to a disconnector operating device 31 supported on the outer surface of the side plate 6, and is connected to a disconnector operating device 31 supported on the outer surface of the side plate 6. The insulating operating unit 30 led out through the inside is connected to the operating unit 31 via a link (not shown).
is connected to.

The disconnector operating device 31 obtains operating force using air pressure, for example, and uses this operating device to control the disconnecting switches DSa1 and [)3a.
2 are opened and closed at the same time. Disconnector 0
The earthing switch ES is formed by the movable contacts 25 of 8al and Q3a2 and the fixed type ff122al and 22a2 for earthing.
ai and ESa2 are set to +i4, and the movable contact 25 is separated from the fixed contact 27 as shown in FIG. 22a2
The side end (movable electrode for grounding) contacts the fixed contact 29 of the fixed electrode for grounding, and the earthing switches ESal and E3
a2 is closed.

A cable head Cl-1al is arranged below the disconnection 'SrDSa1 of each phase. The cable head Ct-1a1 is fixed to the bottom surface of the container 5, and the terminal conductor 35 of this cable head is connected to the fixed side element 21a1 of the disconnector [') 3a1. Cable head C
The terminal portion 36 of the cable 1-1 raised from the underground cable pit to the inside of the pedestal 2 is connected to l-181.

A lightning arrester LA is arranged on the side of the cable head CHa1 of each phase, and a movable element 37 of the earthing switch ESa3 is electrically and mechanically connected to the non-grounding side terminal of the lightning arrester LA of each phase. There is. A fixed element 38 of the earthing switch is arranged on the side of the movable element 37, and this fixed element is attached to the side plate 6. The movable element and the fixed element of the earthing switch ESa3 have the same structure as the movable element and the fixed element of the disconnectors DSa1 and [)3a2, and operate the movable contact of the movable element 37. The insulating operating member 39 passes through a bearing having an airtight structure provided on the side plate 6, and is connected to the grounding switch operating device 4o attached to the outer surface of the side plate 6.

The internal lightning arrester LA of each of the above-mentioned devices is installed from below the outer shell container 5 by being inserted into the outer shell container through a hole provided on the bottom wall of the outer shell container 5.
When the lightning arrester is inserted into the outer shell container, the non-grounding side terminal of the lightning arrester connects to a conductor connection portion provided on the movable element of the grounding device E3a3 (not shown). ) will be automatically connected.

There is a shield 17 interposed between the lower space in the equipment storage space 9.
02 is provided, this shielding wall disconnects the disconnector D.
S al, cable head Cf-1al, lightning arrester LA
The insulation between the phases of the earthing switch ESa3 is strengthened, and a ground fault of each phase occurring in the outer shell container is prevented from developing into a short circuit between phases.

Similarly, in the upper space of the equipment storage room 9, as shown in FIG. 2, a shielding wall 703 is interposed between the phases, thereby reinforcing the insulation between the disconnector DSa1 and the earthing switch [':3al. .

The inclined wall 5a at the upper corner of the outer shell 5011 side is provided with a hole for installing an insulating spacer that opens into the unit storage chamber 9B of each phase, and each installation is done so as to airtightly close the hole for each phase. The insulating spacer 45 of each phase is attached (pulled).The through conductor of the insulating spacer 45 of each phase is connected to the fixed side element 21a2 of the disconnector DSa2.

A gas pressure constant device 46 is also installed on the outer surface of the side root 6, and this device maintains the gas pressure inside the external container 5 within a predetermined range.

A cylindrical cover 48 is attached to the side plate 6 to cover each operating device and drive R side blade attached to the side plate.
There is a door for inspection on the front.

Further, a box body 49 is arranged on the front side of the pedestal 2, and various control devices and protection devices 50 are housed within this box body.

Internal lightning arrester L of equipment configuring the above line side unit A1
The equipment other than A is attached to the insulating support 7 outside the outer shell container 5, and after the side plate 6 is attached to the insulating support 7 so as to airtightly close the unit storage chamber 8A housing each circuit breaker. , an insulating support supporting each device is inserted into the outer shell container 5. Then, the side plate 6 is fixed so as to airtightly close the side surface of the outer shell container 5, and the cable head CHa1 is fixed to the bottom wall of the outer shell container 5 by bolts from below the outer shell container 5. Thereafter, the lightning arrester LA is inserted into the outer shell container 5 from below and attached thereto, and the insulating spacer 45 is attached to the hole from the outside to attach the inclined wall portion 5a at the upper end corner of the outer shell container. Each gas space in the outer shell container 5 is filled with SF6 gas at a predetermined pressure.

(b) Structure of transformer primary unit The transformer primary unit B1 has a box-shaped outer shell container 50 with inclined walls 50a and 50b provided at the upper corners of the front and back sides of the upper end, respectively. An insulating support consisting of an outer frame part 51 having a U-shaped cross section in the outer shell container 50 and two fin-shaped shielding walls 52 protruding from the outer surface of the outer frame part 51 so as to be interposed therebetween. A body 53 is housed therein.

The outer shell container 50 has a removable bottom plate 54, and an insulating support 53 is inserted into the outer shell container 50 with the bottom plate 54 removed.
1 is fixed to the side plate 50c on the front side of the outer shell container 50 with the opening thereof facing the side plate 50c. Outer frame portion 5 of insulating support 53
1 is formed with a disconnector storage chamber 55 that is airtightly closed by a side plate 50c, and inside this disconnector storage chamber, three independent disconnectors are arranged in a direction perpendicular to the paper plane of FIG. It is divided into unit storage chambers 55A. A cable head storage chamber 56 is formed outside the outer frame portion 51, and this storage chamber 56 is divided into three areas arranged perpendicular to the plane of FIG. 1 by a shielding wall 52 interposed between the phases.

Each unit storage chamber 55A of the disconnector storage chamber 55 has a disconnector o.
S bi to D S b3 are stored. Each of the disconnectors D S bl to D S b3 includes a movable element 57 and a fixed element 58 . The movable side element 57 and the fixed side element 58 basically have a known structure in which a movable contact 59 and a fixed contact (not shown) are provided in the shield, but in this embodiment, the movable side element 57 and the fixed side element 58 have a The shield of the side element 57 is provided integrally with a connecting conductor 60 extending in the vertical direction, and this connecting conductor 60 is connected to the partition wall portion 52.
It is supported by the upper and lower walls of the Further, the fixed side elements 58 of the disconnectors DSb1 to DSb3 are disposed so as to face the movable side elements in the horizontal direction, and the partition wall portion 5
The conductors 61 to 63 are connected to conductors 61 to 63, which are provided by airtightly penetrating the upper wall, side wall, and lower wall of 2, respectively.

The cable head Cl- is located at the bottom of the cable head storage chamber.
1b1 and CHb2 are stored. The cable heads CHb1 and CHb2 are supported by the bottom plate 51 of the outer shell container 50, and a cable C is attached to each of these cable heads.
Terminal units 64 and 65 of 13 and 012 are connected. The cable heads CHbl and CHb2 are arranged in three phases in a direction perpendicular to the paper plane of FIG. 1, and a shielding wall 52 is interposed between the phases of these cable heads to strengthen the insulation between the phases.

The upper sloped walls 50a and 50b of the outer shell 350 are provided with mounting holes that open into each unit storage chamber 56A, and each mounting is provided with an insulating spacer 66 to airtightly close the hole.
and 67 are installed. and insulating spacer 67
The through conductor of the insulating spacer 66 is connected to the conductor 61 connected to the fixed side element of the disconnector DSb1 through the connecting conductor 68, and the through conductor of the insulating spacer 66 is connected to the disconnecting switch D through the connecting conductor 69.
It is connected to a connecting conductor 60 that connects to the movable elements Sb1 to D S b2. In addition, the terminal conductor of the cable head CHbl is connected to the disconnector D via the connecting conductor 70.
It is connected to a conductor 62 connected to the fixed side element of the cable head CI-1b2, and the terminal conductor of the cable head CI-1b2 is connected via a connecting conductor 71 to a body 63 connected to the fixed side element of the disconnector D S b3. Outer shell container 50
The inside is filled with SF6 gas at a predetermined pressure.

(C) Connection between units 1 and 1 As shown in FIG. A constant pressure device for controlling the gas pressure inside the container 50 is housed.

And between the insulating spacer 45 of the line side unit A1 and the insulating spacer 66 of the transformer primary side unit B1,
A flexible connecting conductor is arranged in a flexible metal tube, and the metal tube and the connecting conductor are insulated by a solid insulator. Insulating spacer 67 of transformer primary side unit B1 and transformer T
The connection between r1 and the primary side is also possible t2 +l connection bus 76
are interconnected by.

Although the first line side unit A1 and the first transformer primary side unit B1 are shown in FIGS. 1 and 2, the second line side unit Δ2 is the same as the first line side unit Δ2. The second and third transformer primary units B2 and B3 are constructed in exactly the same manner as A1, and the second and third transformer primary units B2 and B3 are the first transformer primary units 1-
It is configured exactly the same as 81.

In the embodiment shown in FIGS. 1 and 2, the equipment storage chamber 8 is divided into three unit storage chambers forming independent gas spaces by partition walls, but the three unit storage chambers are communicated with each other. It is also possible to provide a structure in which a partition wall is provided and the partition walls shield the phases of a three-phase circuit breaker.

(c) Second specific embodiment FIGS. 4 and 5 show a line side unit A1 of a second specific embodiment of the present invention. In this embodiment, the outer frame has a U-shaped cross section. An insulating support 80 is provided for each girder, and integrally includes a portion 81 and fin-shaped shielding walls 82 and 83 for reinforcing interphase insulation that protrude from the outer surface of the upper and lower ends of this outer frame, respectively. The phase insulating support 80 is the outer shell container 5
The insulating supports of each phase are arranged side by side in the horizontal direction, and are fixed to the side plate 6 of the outer shell container 5, which is removably provided. The inside of the outer frame 81 of the insulating support 80 is gas-divided into a disconnector storage chamber 86, a circuit breaker storage chamber 87, and a disconnector storage chamber 88 arranged from bottom to top by partition walls 84 and 85. The inside of each of .87 and 88 is further divided into three independent unit storage chambers lined up in the horizontal direction (perpendicular to the paper plane of FIG. 5) by partition walls.

Inside the disconnector storage chamber 86, there is a disconnector 3a1 consisting of a movable element and a fixed element having the same structure as that used in the embodiment shown in FIG. Similarly, an earthing switch E3a1 configured such that the movable contact of the disconnector doubles as a movable electrode is housed, and when the disconnector DSa1 becomes disconnected, the earthing switch [
:3a1 automatically closes.

The circuit breaker storage chamber 87 houses the interrupting part of the circuit breaker CBa, and the disconnector housing 88 houses the disconnector D3a2 and the earthing switch ESa2. The disconnector DSa2 and the earthing switch E3a2 are the disconnectors DSa1 and E, respectively.
It is configured similarly to Sal, and disconnects 2! When AD3a2 becomes disconnected, earthing switch E3a2 automatically closes.

A cable head CI-tal and a lightning arrester LA are attached to the bottom of the outer shell container 5, the fixed side element of the earthing switch E3a3 is attached to the non-grounding side terminal of the lightning arrester LA, and the movable element of the earthing switch ES83 is attached to the side plate 6. The side elmmen] are attached to each side. In this embodiment, the cable head CHa1 and the lightning arrester LA are attached from the lower side of the outer shell container 5 to the bottom of the outer shell container 5 through holes.

Disconnection Z D S al fixed side niremen 1 ~ is an insulating support)
It is connected to the terminal conductor of the cable head Cl-1a1 through a conductor 90 that is provided by passing through the lower end of the outer frame of the S body 80 in an airtight manner, and the movable side element of the disconnector [3a1] connects the partition wall 84 in an airtight manner. Circuit breaker C via conductor 91 made conductive
It is connected to the terminal on the Ba movable contact side. Circuit breaker C
The terminal on the fixed contact side of B is connected to the movable side element of the disconnector DSa2 via a conductor 92 embedded in the partition wall 85, and the fixed side element of the disconnector DSa2 is connected to the outer frame part 81.
It is connected to the through conductor of an insulating subane 45 attached to the sloped wall portion of the upper end of the outer shell container 5 via a conductor 93 provided through the upper end in an airtight manner.

The outer surface of the side plate 6 is provided with a circuit breaker drive mechanism section 17, an operating device 18 that applies operating force to the circuit breaker of the circuit breaker FSCBa via the drive mechanism section 17, and a circuit breaker DSa1. DS a2(7) operating device 31a1.31a2 and operation Z40 of earthing switch ES83 are attached.

Other points are similar to the embodiment shown in FIG.
The inside is filled with SF6 gas at a predetermined pressure.

In the embodiment of FIGS. 4 and 5, the insulating support 80
is provided for each girder, but it goes without saying that three-phase insulating supports can be provided integrally.

In the embodiment shown in FIGS. 4 and 5, the interiors of the disconnector storage chamber 86, the circuit breaker storage chamber 87, and the disconnector storage chamber 88 in the insulating support are partitioned into three unit storage chambers by partition walls. Although the unit storage chambers constitute independent gas spaces, a partition wall is installed so that the three-phase unit storage chambers in each storage chamber communicate with each other, and the structure is such that the partition walls shield each other from each other. You can also do that.

[Effects of the Invention] As described above, according to the present invention, since the circuit breaker and disconnector are supported on a common insulating support, separate insulating supports are provided for each of the circuit breaker and disconnector. There is no need to provide a , which simplifies the structure and facilitates assembly.

Further, according to the second invention, since the structure is such that the cutoff part and the disconnector are supported on a detachable plate forming a part of the outer shell container,
The gas-insulated switchgear can be assembled by assembling the interrupter and the pair of disconnectors on a plate in advance and then attaching the plate to the container, which eliminates the conventional method of assembling all equipment in a narrow space inside the container. The assembly work can be made easier compared to other devices.

Furthermore, according to the third aspect of the invention, a fixed electrode for grounding is provided on the side of the movable element of the disconnector, and a movable electrode for grounding is provided on the movable contact, so that the component parts of the disconnector can be used to connect the earthing switch. can be configured. Furthermore, since a separate operating device for the earthing switch is not required, the structure of the device can be simplified and the device can be made smaller.

Furthermore, according to the fourth invention, since the disconnection part of each phase is arranged in an independent gas space and the mutual contact between the disconnectors is shielded by a shielding wall, a ground fault occurring in each phase can be prevented from causing a short circuit between the phases. It is possible to prevent this from occurring and improve the reliability of the device.

In particular, according to the fifth invention, both the cutoff section and the disconnector for each phase are arranged in independent gas spaces, so that it is possible to prevent a ground fault or the like occurring in each phase from progressing to a three-phase fault. This can be prevented even more reliably.

Therefore, according to the fourth or fifth aspect of the invention, the upper limit of the pressure inside the container in the event of a three-phase contact accident is almost completely considered! Since there is no need to tighten the container, the strength of the container can be designed to be lower than before, and the weight and cost of the device can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the mechanical configuration of an embodiment of the present invention;
FIG. 2 is a top view of the upper end of the outer shell container of each unit in the embodiment shown in FIG. 1, viewed from above, and FIG. 3A.
and B are explanatory diagrams showing the opening and closing operations of the disconnector and the grounding switch used in the present invention, respectively, and FIG. 5 is a vertical sectional view showing the internal structure of the line side unit of the embodiment, FIG. 6 is a single line diagram showing the electrical configuration of each phase of the embodiment of the present invention, and FIG. The figure is a center line connection diagram showing the electrical configuration of each phase when a bus-type gas-insulated switchgear with a single-bus configuration is constructed using the line-side unit of the embodiment of the present invention. Figure 9 is a single line diagram showing the electrical configuration of each phase when a bus-type gas-insulated switchgear with a 2,000-bus configuration is configured using the line-side unit of the example. FIG. 2 is a single-line diagram showing the electrical configuration of phases. AI, A2...Line side unit, 81-B3...
Transformer primary side unit, CBa...breaker, [) 3
al. DSa2...pair disconnector, ESal, E3a2...
・Earthing switch, CHal, CHbl, CHb2...
・Cable head, LA... Lightning arrester, Tr1 to Tr3
. . . Transformer, 5. Outer shell container, 6. Removable plate constituting the side plate of the container, 7. Insulating support, 701
...Outer frame of insulating support, 702.703m shielding wall,
11...Block V! +CBa cutoff part, 12.13・
...Terminal conductor of the interrupting section, 17... Drive mechanism section of the circuit breaker, 18... Operator of the circuit breaker, 20a1.2Qa2...
- Movable element of disconnector, 21 al. 21a2... fixed side element of disconnector, 22a1,
22a2...Fixed electrode for grounding. Figure 1 Figure 4 Figure 7 Figure 7 Evening Fwa ■ Dip lj Seizan (self-motivated) December 1985 51 1! l8' [1r-Secretary Uga Michibu]
Relationship with Table 21ζ Is Ki+ Showa 60-246372 No. 2, Title of Invention Gas Insulated Opening Device 3, Name of Amendment 110 Patent Applicant (394) Nissin Electric Co., Ltd. r1 11 Agent: fi□U/I-31-6 Bunzan Building 6th Floor 5, Minato-ku, Tokyo
Correct rDsb2J in Detailed Description of the Invention in the Specification Subject to Amendment and Drawings 1, Figure 6, Contents of Amendment (1) Specification, 11, Page 31, 10 (1) to [D, 3b3]. (2) Correct the drawing, Figure 1, as shown in the attached sheet.
figure

Claims (5)

[Claims] (1) A circuit breaker having a breaking part in which a movable contact and a fixed contact are housed in a breaking part container, a fixed side element having a fixed contact, and a movable side element having a movable contact that approaches and separates from the fixed contact. A gas insulated switchgear comprising: a pair of disconnectors electrically connected to both ends of the disconnection section, and a common outer shell container housing the disconnection section and the pair of disconnectors; A common insulating support is provided in the shell container for the cutoff part and the pair of disconnectors 3, and the cutoff part and the pair of disconnectors are supported by the insulating support. Insulated switchgear. (2) A circuit breaker having a breaking part in which a movable contact and a fixed contact are housed in a breaking part container, a fixed side element having a fixed contact, and a movable side element having a movable contact that approaches and separates from the fixed contact. A gas insulated switchgear comprising: a pair of disconnectors electrically connected to both ends of the disconnection section, and a common outer shell container housing the disconnection section and the pair of disconnectors; A common insulating support is provided in the shell container for the cut-off part and the pair of disconnectors, the cut-off part and the pair of disconnectors are supported on the insulating support, and the insulating support is connected to the outside. A gas insulated switchgear characterized in that it is supported on the inner surface of a removable plate that constitutes a part of a shell container. (3) From a circuit breaker having a breaking part in which a movable contact and a fixed contact are housed in a breaking part container, a fixed side element having a fixed contact, and a movable side element having a movable contact that approaches and separates from the fixed contact. A gas insulated switchgear comprising: a pair of disconnectors electrically connected to both ends of the disconnection section; and a common outer shell container housing the cutoff section and the disconnector; A common insulating support is provided for the cut-off part and the pair of disconnectors, the cut-off part and the pair of disconnectors are supported by the insulating support, and the movable element of each disconnector is supported by the insulating support. A fixed grounding electrode is provided on the side, and the movable element of each disconnector is provided with a movable grounding electrode portion that comes into contact with the fixed grounding electrode when the movable contact is displaced to a final disconnection position. Characteristic gas insulated switchgear. (4) A three-phase circuit breaker having a breaking part in which a movable contact and a fixed contact are housed in a breaking part container, a fixed element having a fixed contact, and a movable element having a movable contact that approaches and separates from the fixed contact. A gas comprising a pair of three-phase disconnectors each consisting of a side element and electrically connected to both ends of the cutoff section, and a common outer shell housing the three-phase cutoff section and the disconnector. In the insulated switchgear, a common insulating support is provided in the outer shell container for the interrupting part and the pair of disconnectors, and the insulating support has three equipment storage chambers partitioned by partition walls. and the three-phase disconnectors are housed in each of the three equipment storage chambers, the three-phase pair of disconnectors are supported on the outside of the insulating support, and the shielding wall provided on the insulating support is connected to the insulating support. A gas insulated switchgear characterized by being interposed between each phase of a pair of three-phase disconnectors. (5) A three-phase circuit breaker having a breaking part in which a movable contact and a fixed contact are housed in a breaking part container, a fixed element having a fixed contact, and a movable element having a movable contact that approaches and separates from the fixed contact. A gas comprising a pair of three-phase disconnectors each consisting of a side element and electrically connected to both ends of the cutoff section, and a common outer shell housing the three-phase cutoff section and the disconnector. In the insulated switchgear, a common insulating support is provided in the outer shell container for the interrupting section and the pair of disconnectors, and the insulating support is provided for each phase with an independent circuit breaker storage chamber and the pair of disconnectors. The gas-insulated switchgear has a disconnector storage chamber for a disconnector, and a circuit breaker storage chamber for each phase and a predetermined disconnector are respectively stored in the circuit breaker storage chamber for each phase and a predetermined disconnector. Device.