JPH087765Y2 - Gas insulated switchgear - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention uses a circuit breaker, current transformer, main circuit conductor, etc. to reduce the installation area of a gas-insulated switchgear generally abbreviated as GIS. The present invention relates to a composite gas-insulated switchgear that is housed in a single container and reduced in size.

[Conventional technology]

In a composite type gas insulated switchgear (hereinafter referred to as GIS), a main circuit conductor for arranging a bar-shaped circuit breaker in an upright cylindrical container and branching it into multiple busbars. A gas insulated switchgear with a reduced installation area is constructed by disposing a current transformer, through which a high voltage conductor on the fixed contact side drawn out from the upper part of the circuit breaker is passed through as a primary winding, on the upper part of the circuit breaker.

FIG. 5 is an elevational view of a composite GIS of the prior art, in which a common container 1 for accommodating a circuit breaker is shown in a sectional view of the container wall so that the contents are displayed. In this figure,
An insulating gas consisting of sulfur hexafluoride, generally called SF ₆ , of several atmospheres is enclosed in the inside of the common container 1, and the breaker 2, the current transformer 3, and the main circuit conductor 41 are enclosed in the insulating gas. And the like are housed in common, and are mechanically connected to an adjacent container 61 via an insulating spacer 51, and are electrically connected by a high-voltage conductor 42 penetrating the insulating spacer 51.

The main circuit conductor 41, which is connected to the movable contact side of the circuit breaker 2 and is pulled out from the lower portion, is branched into two bus bars 62 and 63 in this figure, penetrates the insulating spacer 52, and is mechanically and electrically connected. The high-voltage conductor 42 drawn from the upper portion of the circuit breaker 2 on the fixed contact side is drawn straight upward coaxially with the circuit breaker 2, penetrates the current transformer 3, and then bends to the right into the adjacent container 61. .

FIG. 6 is a horizontal sectional view of a portion including the current transformer 3 of FIG. In this figure, each of the circuit breaker 2, the current transformer 3, and the main circuit conductor 41 is composed of three pieces, but this shows three phases, and thus three phases are collectively described as 1 The size is reduced by storing it in one container. Circuit breaker 2 shown by chain line, current transformer 2 and high-voltage conductor 42 shown in cross section
All are configured in a coaxial arrangement, and have a simple configuration.

[Problems to be solved by the device]

When the circuit breaker 2 interrupts the fault current, a high temperature gas is ejected upward from the upper end of the circuit breaker 2. This high-temperature gas is used to blow out the arc generated during the breaking operation and is discharged to the outside, or the high-temperature gas contains metal vapor and the like, which is a part of the contact evaporated by the arc. If such a high temperature gas blows out from the upper end of the circuit breaker 2 toward the upper part, there is a risk that the through hole 31 between the current transformer 3 and the high-voltage conductor 42 is directly blown in, and the dielectric strength therebetween is lowered.

In order to avoid such a risk, the current transformer 3 is provided at a high position sufficiently separated from the circuit breaker 2. The GIS may be installed outside the substation in the town, and in such a case, it is general to make it as inconspicuous as possible from the outside of the site, and for that reason, the installation area of the GIS is small. In addition to the greatest feature, it is required to have a small height. Also, when installed indoors or especially in the basement,
There is a strong demand for short GIS to reduce the cost of building and basement construction.

It is an object of the present invention to provide a low GIS by reducing the height of the common container by lowering the installation position of the current transformer without being affected by high temperature gas.

[Means for solving the problem]

In order to solve the above problems, according to the present invention, a circuit breaker which is vertically arranged with the fixed contact side facing upward and which ejects high-temperature gas upward from the upper end at the time of a breaking operation,
Three-phase breakers each having an axially symmetric structure with a vertical axis of symmetry are provided for each of the three phases, and the circuit breakers and the current transformers for the three phases are collectively housed in a common container, and each of the phases is blocked. In a gas-insulated switchgear in which a high-voltage conductor drawn from the upper end of a switch penetrates through holes of a current transformer of each phase, the high-voltage conductor of each phase is temporarily drawn horizontally from the upper end of the circuit breaker of each phase. Then, the high temperature gas is erected vertically and jets three symmetry axes of the circuit breaker of each phase and the symmetry axis of the current transformer of each phase upward from the upper end of the circuit breaker of each phase. Is shifted to a position where it is not directly blown into the through hole of the current transformer of each phase.

[Action]

In the configuration of the present invention, the conductor that is drawn from the upper end of the upright circuit breaker that ejects high-temperature gas from the upper end during the breaking operation is temporarily pulled out horizontally and then vertically raised so that the axis of symmetry is vertical. By piercing the through hole of a through-type current transformer with a symmetrical structure, the axis of symmetry of the circuit breaker and the axis of symmetry of the current transformer are misaligned, and jetting upwards from the upper end of the circuit breaker. Since the high temperature gas does not directly blow into the through hole of the current transformer to lower the dielectric strength, the installation position of the current transformer can be lowered, and the height of the common container is reduced.

〔Example〕

The present invention will be described below based on embodiments. FIG. 1 is an elevational view showing an embodiment of the present invention, and like FIG. 5, only the container wall of the common container 1 is shown in cross section. Also,
The same members as those in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

The high-voltage conductor 43 is pulled out laterally from the upper end of the circuit breaker 2, vertically rises upward as in the conventional case, penetrates the through hole 31 of the current transformer 3, and is then bent at a right angle to become horizontal. In this structure, the insulating spacer 51 is penetrated and electrically connected to the container 61.

FIG. 2 is a horizontal sectional view at a position including the current transformer 3 as in FIG. The circuit breaker 2 is indicated by a circle, and the current transformer 3 shown by the cross-section with diagonal lines and the high-voltage conductor 43 penetrating the through hole 31 of the current transformer 3 are displaced from the circuit breaker 2 in a concentric arrangement. It is configured to be installed at a different position. Circuit breaker 2,
The current transformer 3, high voltage conductor 43 and main circuit conductor 41 are all 3
Each of them is arranged in a circular common container 1, but as described above, these three phases are stored together in a single container, and a structure that reduces the size of the GIS is adopted. It is what

FIG. 3 is an enlarged view of a main part of FIG. 1 in which part B is enlarged. In this figure, an electrostatic shield 32 for relaxing electric field concentration is provided on the inner surface of the current transformer 3 in order to secure dielectric strength between the current transformer 3 which is a ground voltage and the high-voltage conductor 43. There is. After the horizontal conductor 431 is first drawn out from the upper end of the circuit breaker 2, the high-voltage conductor 43 rises vertically and penetrates the through hole 31 of the current transformer 3 to penetrate upward.

Since the position of the high-voltage conductor 43 is horizontally moved to the left side of the figure by the conductor 431, the common symmetry axis 33 between the current transformer 3 and the high-voltage conductor 43 is the same as the symmetry axis 21 of the circuit breaker 2. When the circuit breaker 2 operates and the fault current is cut off, the high temperature gas 7 ejected upward from the upper end does not blow into the through hole 31 and is located outside the current transformer 3. Head up through.

Since the hot gas 7 does not blow into the through hole 32 of the current transformer 3, the dielectric strength between the electrostatic shield 32 of the current transformer 2 and the high-voltage conductor 43 is reduced by the metal vapor or metal powder contained in the hot gas 7. There is no danger of Therefore, it is not necessary to set the position of the current transformer 3 at a high position apart from the upper end of the circuit breaker 2, and it suffices to secure a necessary insulation distance with respect to the upper end of the circuit breaker 2. The configuration of FIG. 3 is the same for the other two phases.

By disposing the current transformer and the high-voltage conductor 43 at positions displaced from the breaker 2 as shown in FIG. 2, the diameter of the common container 1 becomes slightly larger than that of the prior art shown in FIG. As mentioned above, when the height of the GIS is required to be small, the reduction of the height is more important than the slight increase of the installation area.

FIG. 6 is an elevational view showing another embodiment of the present invention.
In FIG. 1, the busbars 61 and 62 are connected to one side surface of the common container 1 and the container 61 is connected to the other side surface, respectively. And container 6
GIS with 1 and 1 connected to only one side of common container 1A
Is the case. In this case, since the main circuit conductor 41 has a complicated structure, the main circuit conductor 41 is provided near the side surface on the side where the busbars 62 and 63 are connected, while the circuit breaker 2 is provided on the opposite side to the common container 1A.
The current transformer 3 is also provided on the left side of the figure, as is the case with the circuit breaker 2, because the current transformer 3 is provided at a position close to the ruled surface. On the other hand, since the container 61 to which the high-voltage conductor 43A is electrically connected is connected to the right side of the drawing via the connection container 64, the high-voltage conductor 43A is connected.
After passing through the current transformer 3, 43A is connected to the connecting container 64 with a long dimension in the horizontal direction.

It should be noted that all of the above-described embodiments are cases in which reduction in height dimension is particularly important, such as GIS installed in an underground substation, for example, GI installed in a substation in a suburb.
As in the case of S, it is not so important to reduce the height dimension, and if the reduction of the installation area is more important, it is appropriate to apply the conventional technique.

[Effect of device]

As described above, the present invention, as described above, pulls out a high-voltage conductor from the upper end of an upright circuit breaker once to the side and then raises it vertically, and in the middle of that, a through-type current transformer with an axisymmetric structure. Since the symmetry axis of the circuit breaker and the symmetry axis of the current transformer are misaligned by arranging to penetrate the through hole of
Since the high temperature gas ejected upward from the upper end of the circuit breaker does not blow directly into the through hole of the current transformer during the breaking operation, there is no risk of lowering the dielectric strength between the high voltage conductor and the current transformer. . Therefore, since the current transformer can be installed at a low position, it is possible to reduce the height dimension of the common container that houses the current transformer and the circuit breaker in common, and eventually the GIS
The overall height dimension will be reduced. as a result,
In the case of a GIS installed in an underground substation or an indoor building, the construction cost will be reduced, and if installed in a substation in the town, it will be an inconspicuous GIS and the surrounding aesthetics may be spoiled. The effect is that the amount is reduced.

[Brief description of drawings]

FIG. 1 is an elevational view showing an embodiment of the present invention, and FIG. 2 is a first view.
FIG. 3 is a horizontal sectional view of the drawing, FIG. 3 is an enlarged view of a main part of FIG. 1, FIG. 4 is an elevation view showing another embodiment of the present invention, and FIG. FIG. 6 is a horizontal sectional view of FIG. 1,1A …… common container, 2 …… breaker, 3 …… current transformer, 31 ・ ・ ・
… Through hole, 42,43,43A …… High voltage conductor, 7 …… High temperature gas.

Claims (1)

[Scope of utility model registration request] 1. A circuit breaker which is vertically arranged with a fixed contact side upward and which ejects high-temperature gas upward from an upper end during a breaking operation, and a through-type current transformer having an axisymmetric structure in which a symmetry axis is vertical. Circuit breakers and current transformers for the three phases are collectively housed in a common container, and a high-voltage conductor drawn out from the upper end of the circuit breaker for each phase is a transformer for each phase. In a gas-insulated switchgear formed by penetrating through a through hole of a current transformer, the high-voltage conductors of the respective phases are once drawn horizontally from the upper ends of the circuit breakers of the respective phases and then risen vertically, and the circuit breakers of the respective phases are symmetrical. The high temperature gas ejected upward from the upper end of the breaker of each phase is blown directly into the through hole of the current transformer of each phase. A gas-insulated switchgear characterized by being shifted to a non-existing position.