JP2004056957A - Switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switchgear which does not use insulating gas as an insulating medium. <P>SOLUTION: The circuit breaker 40 disconnecting switches 30 and 50, and grounding switch 70 of a receiving unit 1 constituting the switchgear are encircled with solid insulators 45, 35, 55, and 75. Insulating rods 36, 46, 56, 76 to be linked and coupled with driving means 38 and 39 for operating the circuit breaker 40 and the like are insulated in air. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a switchgear, in which an insulating gas is not used for an insulating medium.
[0002]
[Prior art]
The switching device is filled with a high-pressure (0.2 to 0.65 MPa) insulating gas as an insulating medium in a conduit, and a gas circuit breaker (GCB), a disconnecting switch (DS), a ground switch (ES), a lightning arrester. (LA) and a cubicle-type gas-insulated switchgear containing a gas circuit breaker (GCB) filled with a low-pressure (0-0.1 MPa) insulating gas as an insulating medium in a rectangular container. There is a gas insulated switchgear.
[0003]
As the switchgear of high voltage (12 to 72/84 KV class), the above two kinds of switchgears are used from the viewpoint of space saving and reliability in insulation performance.
[0004]
The reason for using the insulating gas as described above is as follows.
(1) Since a large current interruption and a high insulation recovery capability are required, a gas circuit breaker is used as a circuit breaker.
(2) The disconnecting switch / grounding switch has a movable portion, and an insulating gas is required to secure insulation performance of the movable portion during the switching operation and in the closed state.
[0005]
[Problems to be solved by the invention]
However, in recent years, from the viewpoint of preventing global warming, insulating gas has been cited as a target for emission reduction, and it has been obliged to reduce the amount of insulating gas used and to collect it at sites and factories.
[0006]
Therefore, an object of the present invention is to solve such a problem and to provide a switchgear that does not use an insulating gas.
[0007]
[Means for Solving the Problems]
The opening and closing device according to claim 1 for achieving the above object is provided with an opening / closing unit, and a driving unit for opening / closing the opening / closing unit is connected to the opening / closing unit via an insulating rod. The device is characterized in that the periphery of the blocking part is solid insulation and the periphery of the insulating rod is air insulation.
[0008]
In such a switchgear, the insulation is insulated by solid insulation, and the insulation rod is insulated by air insulation.
[0009]
The configuration of the switchgear according to claim 2 is characterized in that a housing space for the insulating rod is sealed, and the housing space is filled with dry air or nitrogen gas.
[0010]
In such a switchgear, dry air or nitrogen gas is used as air insulation.
[0011]
The configuration of the switchgear according to claim 3, wherein a plurality of the interrupting portions are provided, a solid insulator individually surrounding the interrupting portions is provided, and a protrusion for connecting connection conductors connected to the interrupting portion is provided. And a recess are formed in the solid insulator to form a plurality of units, and the units are mechanically and electrically detachably connected to each other by fitting the protrusions into the recesses. I do.
[0012]
In such an opening and closing device, the units are connected to each other by fitting the convex portion into the concave portion, so that the assembly of the opening and closing device becomes easy.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a switchgear according to the present invention will be described.
[0014]
(A) Embodiment 1
First, Embodiment 1 is shown in FIG. This embodiment shows a power receiving unit in a switchgear, and the electrical connection corresponds to the single-line diagram shown in FIG.
[0015]
The power receiving unit 1 connects the cable 62 to the bus 20 via the disconnector 30, the circuit breaker 40, the disconnector 50, and the cable head 60, grounds the main circuit via the grounding switch 70, and connects the lightning arrester 80 to the busbar 20. It is grounded through.
[0016]
Although the above components are arranged in three phases, they are described only for one phase for ease of explanation. The bus bar 20 is arranged at the uppermost part, and the disconnector 30 is arranged long below it. Below the disconnector 30, a circuit breaker 40, a disconnector 50, a grounding switch 70, a lightning arrester 80, and a cable head 60 are arranged in this order from the left. Each of the bus 20, disconnector 30, circuit breaker 40, disconnector 50, ground switch 70, and lightning arrester 80 is molded with a solid insulator 25, 35, 45, 55, 75, 85. In addition, L-shaped connection conductors 90, 100, and 61 molded with solid insulators 95, 105, and 65 are used.
[0017]
Each of the four switches, namely, the disconnector 30, the circuit breaker 40, the disconnector 50, and the grounding switch 70, has a fixed lead rod to which a fixed electrode is fixed and a movable electrode to which a movable electrode capable of contacting and separating from the fixed electrode is fixed. A vacuum interrupter in which a lead rod is housed inside a vacuum vessel is used. The fixed-side conductors 31, 41, 51, 71 are connected to the fixed lead rods, and the movable-side conductors 34, 44, 44, 44, 44, 44 are connected to the movable lead rods 32, 42, 52, 72 via the contacts 33, 43, 53, 73. 54 and 74 are connected.
[0018]
Insulating convex portions and insulating concave portions are formed in the solid insulators 25, 35, 45, 55, 75, 85, 95, 105, 65 and the cable 62 in order to connect a unit constituted by these components in a cassette manner. ing. When the combination of the insulating convex portion and the insulating concave portion is indicated as (insulating convex portion / insulating concave portion), (25a / 35b), (35a / 45b), (55a / 45c), (95a / 55b), (95b / 75b) ), (105a / 95c), (85a / 105b), (65a / 105c), (62a / 65b), (bus 20 / fixed conductor 31) and (movable conductor 34 / fixed conductor 41). (Movable-side conductor 44 / movable-side conductor 54), (connection conductor 90 / fixed-side conductor 51), (connection conductor 90 / fixed-side conductor 71), (connection conductor 90 / connection conductor 100), and (connection conductor 100 / The connection between the lightning arrester 80), the connection conductor 100 and the connection conductor 61, and the connection conductor 61 and the cable 62 is established. In the structure of these connection portions, for example, contacts 64 are provided as shown in FIG. In addition, the movable conductor 74 of the grounding switch 70 and the lightning arrester 80 are individually grounded. 62 is a cable, 63 is a current transformer.
[0019]
The driving means of the disconnector 30, the circuit breaker 40, the disconnector 50, and the grounding switch 70 will be described. The movable lead rod 32 of the disconnector 30 is interlocked and connected to a driving means 38 via an insulating rod 36 and a lever 37. The movable lead rods 42, 52, 72 of the circuit breaker 40, the disconnecting switch 50, and the grounding switch 70 are connected via insulating rods 46, 56, 76, levers 47, 57, 77, rods 48, 58, 78, lever 49 and the like. The space in which the insulating rods 36, 46, 56, and 76 are interlockingly connected to the driving means 39 is filled with air and communicates with the outside air.
[0020]
In such a lightning arrester, the disconnecting switch 30, the circuit breaker 40, the disconnecting switch 50, the grounding switch 70, the lightning arrester 80, and the like are unitarily molded and insulated by the solid insulators 35, 45, 55, 75, and 85. Are combined to form a switchgear. The insulating rods 36, 46, 56, and 76 are air-insulated.
[0021]
(B) Embodiment 2
Next, a second embodiment is shown in FIG. This embodiment is a modification of the first embodiment, and only different parts will be described. To seal the space in which the insulating rods 36, 46, 56 is accommodated, a cover 35k for covering the portion of the lever 37, 47, and 57, 45k, 55k are provided, the _{N 2} gas 3 is filled into these internal ing. Dry air may be used instead of N ₂ gas.
[0022]
In such a switchgear, since using N ₂ gas as a portion of the insulating medium which accommodates the insulating rod, it improves the environmental resistance and insulation performance.
[0023]
Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.
[0024]
(C) Embodiment 3
Next, a third embodiment is shown in FIG. In this embodiment, the solid insulators 45, 55, 95, 75, 105, and 65 in FIG.
[0025]
As a result, the following parts have been changed. First, a movable connection conductor 84 having a shape in which the movable connection conductor 44 and the movable connection conductor 54 are integrated is used. Next, a single connection conductor 64 is used instead of the connection conductors 90, 100, and 61, and the fixed conductors 51 and 71 are coupled to the connection conductor 64. Furthermore, the connection of the (movable-side conductor 34 / fixed-side conductor 41), the (connection conductor 64 / lightning arrester 80), and the (connection conductor 64 / cable 62) can be expressed as a combination of (insulating convex / insulating concave) (35a 66b), (85a / 66d) and (62a / 66e).
[0026]
Such a switchgear differs from the first embodiment in that the solid insulators 45, 55, 95, 75, 105, and 65 in the first embodiment are integrated into a single solid insulator 66.
[0027]
Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.
[0028]
(D) Embodiment 4
Next, a fourth embodiment is shown in FIG. This embodiment is a modification of the third embodiment, and is similar to the relationship of the second embodiment with respect to the first embodiment. Therefore, only different portions will be described.
[0029]
To seal the space in which the insulating rods 36, 46, 56 is accommodated, a cover 35k for covering the portion of the lever 37, 47, and 57, 65 k, 65 k is provided, the _{N 2} gas 3 is filled into these internal ing. Dry air may be used instead of N ₂ gas.
[0030]
The other configuration and operation are the same as those of the third embodiment, and thus the description is omitted.
[0031]
(E) Embodiment 5
This embodiment shows a transformer primary unit in a switchgear, and the electrical connection corresponds to the single-line diagram shown in FIG.
[0032]
As shown in FIG. 8, the transformer primary unit 110 is configured by connecting a cable 162 to a bus 120 via a disconnector 130, a circuit breaker 140, and a cable head 160.
[0033]
Although the above components are arranged in three phases, they are described only for one phase for ease of explanation. The busbar 120 is arranged at the uppermost part, and the disconnector 130 is arranged long below it. The circuit breaker 140 and the cable head 160 are arranged below the disconnector 130. Each of the busbar 120, the disconnector 130, the circuit breaker 140, and the connection conductor 161 is molded with a solid insulator 125, 135, 145, 165.
[0034]
Each of the switches of the disconnector 130 and the circuit breaker 140 accommodates a fixed lead rod to which a fixed electrode is fixed and a movable lead rod to which a movable electrode that can contact and separate from the fixed electrode is fixed inside the vacuum vessel. A vacuum interrupter is used. The fixed-side conductors 131 and 141 are connected to the fixed lead bars, and the movable-side conductors 134 and 144 are connected to the movable lead bars 132 and 142 via the contacts 133 and 143.
[0035]
The solid insulators 125, 135, 145, 165 and the cable 162 are formed with an insulating convex portion and an insulating concave portion in order to connect them by a cassette method. When the combination of the insulating convex portion and the insulating concave portion is indicated as (insulating convex portion / insulating concave portion), the combination of (125a / 135b), (135a / 145b), (165a / 145c), and (162a / 165b) gives ( The bus 120 / fixed-side conductor 131), the (movable-side conductor 134 / fixed-side conductor 141), the (movable-side conductor 144 / connection conductor 161), and the (connection conductor 161 / cable 162) are connected.
[0036]
The driving means of the disconnector 130 and the circuit breaker 140 will be described. The movable lead rod 132 of the disconnector 130 is linked to the driving means 138 via an insulating rod 136 and a lever 137. The movable lead rod 142 of the circuit breaker 140 is filled with air in the space where the insulating rods 136 and 146, which are interlockingly connected to the driving means 139 via the insulating rod 146, the lever 147, the rod 148 and the lever 149, are connected. , Communicates with the outside air.
[0037]
In such a lightning arrester, the disconnecting switch 130, the circuit breaker 140, and the connection conductor 161 are unitarily molded and insulated from the solid insulators 135, 145, 165, and these units are combined to form a switchgear. . The insulating rods 136 and 146 are air-insulated.
[0038]
(F) Embodiment 6
Finally, Embodiment 6 is shown in FIG. This embodiment is a modification of the seventh embodiment, and only different parts will be described. In order to seal the space in which the insulating rods 136 and 146 are accommodated, covers 135 k and 145 k are provided to cover the levers 137 and 147, and the inside thereof is filled with N ₂ gas 3. Dry air may be used instead of N ₂ gas.
[0039]
In such a switchgear, environmental resistance and the insulation performance is improved because use of N ₂ gas as an insulating medium.
[0040]
Other configurations and operations are the same as those of the fifth embodiment, and therefore, description thereof will be omitted.
[0041]
【The invention's effect】
As can be seen from the above description, according to the switchgear according to claims 1 to 3, since the periphery of the cutoff portion performs solid insulation and does not use an insulating gas, it is possible to reduce the discharge amount of the insulating gas, It is economically advantageous because it is not necessary to collect the insulating gas at the time of manufacturing or on-site work. Further, since the periphery of the insulating rod is air-insulated, environmental resistance is improved, and the insulation distance can be shortened, so that the size of the switchgear can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view showing Embodiment 1 of a switchgear according to the present invention.
FIG. 2 is a sectional view showing Embodiment 2 of the switchgear according to the present invention.
FIG. 3 is a sectional view showing a third embodiment of the switchgear according to the present invention.
FIG. 4 is a sectional view showing a fourth embodiment of the switchgear according to the present invention;
FIG. 5 is an enlarged view of a portion A in FIG. 1;
FIG. 6 is a single-line diagram of a power receiving unit in the switchgear.
FIG. 7 is a single-line diagram of a primary transformer unit in the switchgear.
FIG. 8 is a sectional view showing a fifth embodiment of the switchgear according to the present invention.
FIG. 9 is a sectional view showing a sixth embodiment of the switchgear according to the present invention.
[Explanation of symbols]
3 ... _{N 2} gas 30, 50 ... disconnector 35,45,55,75 ... solid insulator 36,46,56,76 ... insulating rods 38 and 39 ... driving means 40 ... breaker 70 ... grounding switch

Claims (3)

In a switching device in which a blocking unit is provided, and a driving unit for opening and closing the blocking unit is operatively connected to the blocking unit via an insulating rod,
A switchgear, wherein the periphery of the blocking portion is solid insulated, and the periphery of the insulating rod is aerial insulation. The switchgear according to claim 1, wherein a space for accommodating the insulating rod is sealed, and the space is filled with dry air or nitrogen gas. A plurality of the blocking portions are provided, and a solid insulator individually surrounding the blocking portions is provided, and a convex portion and a concave portion for coupling connection conductors connected to the blocking portion are formed on the solid insulator. The opening / closing device according to claim 2, wherein a plurality of units are configured to be connected to each other, and the units are mechanically and electrically detachably connected to each other by fitting the convex portions into the concave portions.

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