JP2004064955A - Gas insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of stages of the assembling work of a gas insulated switchgear by simplifying the assembling work. <P>SOLUTION: A bus disconnector is built in an enclosed container (second) previously encapsulating insulating gas and then the enclosed container (second) is inserted into an enclosed container (first) encapsulating insulating gas thus simplifying the assembling work of the bus disconnector. Furthermore, the enclosed container (first) is provided with a pressure releaser in order to protect the enclosed container (second) against damage when the inner pressure increases due to an accident. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear in which a switchgear is housed in a sealed container filled with an insulating gas.
[0002]
[Prior art]
In general, the power receiving switchgear transfers power drawn from a higher-order switchgear or power system via a power cable to a bus 56 via a power receiving disconnector, a circuit breaker 53, a bus disconnector and a bus bushing 55. It is configured to transmit power to a switchgear configured in another row board from here, and to control power supply to a load.
[0003]
Conventional gas-insulated switchgear device for receiving, as shown in FIG. 3, the power receiving disconnector 52, breaker 53, the main circuit devices such as bus for disconnecting switch 54, enclosing an insulating gas such as SF ₆ gas The power cable 51 and the bus bar 56 are accommodated in an outer frame 65 on the rear side of the sealed container 61, and the main circuit device is operated in an outer frame 66 on the front side of the sealed container 61. The mechanism is accommodated, and each device is connected by a main circuit conductor. Further, the inside of the closed container 61 is divided by a partition wall 62 into a circuit breaker room 63 accommodating the circuit breaker 53 and a bus disconnector room 64 accommodating the bus disconnector 54, and a short circuit or the like in each room. In the event of an accident, they do not affect each other. Then, the circuit breaker 53 and the bus disconnector 54 are connected via a bushing 57 and connection conductors 58 and 59 which are installed through the partition wall 62 in an airtight manner.
[0004]
In this power receiving gas insulated switchgear, power is drawn from a power system by a power cable 51 and supplied to a bus 56 via a power receiving disconnector 52, a circuit breaker 53, and a bus disconnector 54.
[0005]
In the case of a gas insulated switchgear for power supply, power is received from the bus 56 and power is supplied to the power cable 51 connected to the load via the bus disconnector 54-circuit breaker 53-power supply disconnector 52. Therefore, the disconnector 52 operates for power supply.
[0006]
In the gas insulated switchgear configured as described above, the main circuit devices of the switchgear and the main circuit conductors connecting them are accommodated in a sealed container filled with an insulating gas, so that the insulation performance is improved. The size of the main circuit device can be reduced, and the intervals between the devices and the main circuit conductors can be reduced. This has the advantage that the switchgear can be downsized.
[0007]
[Problems to be solved by the invention]
However, in the conventional gas insulated switchgear as described above, since it is necessary to perform the work of attaching the main circuit devices and the work of connecting the main circuit conductors in each of the compartments of the hermetically sealed enclosure 61, it is difficult to perform the assembling work. However, there is a disadvantage that assembling of the apparatus requires many man-hours. Further, since the partition wall 62 of the sealed container 61 in the conventional device is made of the same metal material as the sealed container 61, the distance between the disconnector and the main circuit conductor in the bus disconnector chamber 64 and the sealed container wall is increased. There is also an inconvenience that the device needs to be taken and the device becomes large.
[0008]
The present invention solves such a disadvantage of the conventional apparatus, and therefore, the assembling work is simplified, the number of assembling steps can be reduced, and the gas can be reduced in size by reducing the bus disconnector chamber. It is an object to provide an insulated switchgear.
[0009]
[Means for Solving the Problems]
In order to solve this problem, the present invention accommodates main circuit devices such as a disconnector for power supply or power supply, a circuit breaker, and a bus disconnector in a sealed container filled with an insulating gas, and interconnects each other by a main circuit conductor. In the gas-insulated switchgear connected, a first sealed container filled with an insulating gas and a second sealed container filled with an insulating gas are provided, and power is supplied or supplied into the first sealed container. A second disconnecting device and a circuit breaker are accommodated therein, and a bus disconnector is accommodated in the second sealed container. The second sealed container accommodating the bus disconnector is hermetically sealed in the first closed container. It is characterized by being inserted and arranged.
[0010]
In the above invention, an opening may be provided in the upper portion of the second closed container, and the opening may be sealed from above by a lid plate that is attached through the busbar bush in an airtight manner.
[0011]
Further, in the present invention, an opening is provided in an upper portion of the first closed container, and a second closed container containing the bus disconnector is inserted into the first closed container from the opening, In addition, this opening can be closed by the second closed container.
[0012]
The second closed container is preferably formed of an insulating material such as an insulating resin.
[0013]
Further, in the present invention, a pressure relief device for releasing the pressure inside the first closed vessel to the outside at a pressure smaller than the pressure at which the second closed vessel is broken is provided in a part of the first closed vessel. It can also be provided.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described based on an embodiment shown in the drawings.
[0015]
FIG. 1 is a longitudinal sectional view showing a main part of a gas insulated switchgear according to an embodiment of the present invention. In this figure, 11 is a power cable for taking in power from a power system or sending power to a load, and 12 is a power receiving or opening / closing main circuit from the power cable 11 to a circuit breaker 13 such as a vacuum circuit breaker or the like. A disconnector for power transmission, 14 is a bus disconnector for opening and closing a main circuit from the circuit breaker 13 to the bus 16, and 15 is a bus bushing for supporting the bus 16.
[0016]
Reference numeral 21 denotes a first airtight container that accommodates the disconnector 12 and the circuit breaker 13 in the circuit breaker room 22 therein, and is housed in the outer frame 30. An insulating gas such as SF ₆ gas or dry air is sealed in the closed container 21 to insulate the housing equipment and the main circuit conductor. The closed container 21 is formed of a metal material to increase mechanical strength.
[0017]
As shown in detail in FIG. 2, reference numeral 24 denotes a second hermetically sealed container comprising a container main body 26 having an open top and a lid plate 27 for closing the opening of the main body 26. The closed container 24 is entirely formed of an insulating material such as an insulating resin. The bus disconnector 14 is assembled and accommodated in the container main body 26, while the bus bar bushing 15 supporting the bus 16 is hermetically penetrated and attached to the cover plate 27.
[0018]
The hermetically sealed container 24 incorporates the bus disconnector 14 into the container main body 26, and covers the upper opening with a cover plate 27 to which the bus bar bushing 15 is attached, and tightly and tightly couples to the container main body 26. This forms an airtight closed container. The fixed contact 141 of the bus disconnector 14 is attached to the lower end of the bus bushing 15, and the movable contact 142 of the bus disconnector 14 contacts and separates from the fixed contact 141 to open and close the connection between the bus 16 and the circuit breaker 13. The terminal conductor 143 on the movable contact 142 side of the bus disconnector 14 penetrates the bottom wall of the container body 26 in an airtight manner and is drawn out of the closed container.
[0019]
After incorporating the bus disconnector 14 and the bus bushing 15 inside and outside the container in this manner, the second hermetic container 24 is inserted through the upper opening of the first hermetic container 21 and the container body of the lid plate 27 is removed. The outwardly protruding flange portion is airtightly tightened and connected to the flange portion of the sealed container 21. Then, an operation shaft 144 penetrating through the container side wall of the bus disconnector 14 incorporated in the second closed container 24 and pulled out to the outside, and a disconnection penetrated from the outside of the first closed container 21 and attached thereto. The container operating mechanism 14a is connected in the first closed container 21.
[0020]
The three-phase terminal conductors 143 of the disconnector 14 pulled out from the bottom wall of the second hermetic container 24 are arranged in the left-right direction in FIGS. The three-phase terminal conductor 131 is rotated exactly 90 degrees with the three-phase terminal conductor 131 and arranged in the front-rear direction in FIG.
[0021]
In order to connect the terminal conductors displaced from each other by 90 degrees as described above, the terminal conductors of the disconnector 14 and the circuit breaker 13 are connected via the phase conductor arrangement conversion mechanism 18 whose structure is shown in detail in FIG. I do.
[0022]
In FIG. 3, 18U-1, 18V and 18W-1 are first phase conductors connected to each phase of 143 to three-phase terminal conductors of the bus disconnector 14, 18U-2, 18V and 18W-2. Is a second phase conductor connected to each phase of the three-phase terminal conductor 131 of the circuit breaker 13, and 18V is common to the first phase conductor and the second phase conductor. 18U-3 is a connecting conductor connecting the first U-phase conductor 18U-1 and the second U-phase conductor 18U-2 shifted by 90 degrees, and 18W-3 is also positioned at 90 degrees with respect to each other. These are connection conductors that connect the shifted first W-phase conductor 18W-1 and second W-phase conductor 18W-2.
[0023]
When the bus disconnector 14 terminal conductor 143 and the terminal conductor 131 of the circuit breaker 13 are connected via the phase conductor arrangement conversion mechanism 18 configured as described above, the second hermetic container 24 is made of an insulating material. Therefore, the insulation distance between the phase conductor arrangement changing mechanism 18 and the sealed container 24 can be made extremely small, and therefore the distance between the sealed container 24 and the circuit breaker 13 can be narrowed, which is effective in downsizing the device. .
[0024]
Reference numeral 13a is an operation mechanism of the circuit breaker 13. The operation mechanism of the disconnector 12 is configured to be shared with the operation mechanism 14a of the bus disconnector 14, but details thereof are not shown.
[0025]
Reference numeral 23 denotes a pressure relief device provided in a pressure relief hole in the ceiling wall of the first closed container 21. The pressure relief device 23 causes an accident involving an arc in the circuit breaker room, and the internal pressure is reduced to a predetermined value. When the pressure rises above the pressure, the lid that normally closes the pressure release hole is broken to release the internal pressure to the outside, and has a function of suppressing the rise in the internal pressure.
[0026]
In such a switchgear, after the assembly is completed, an insulating gas is sealed in the first closed container 21 and the second closed container 24 to insulate the main circuit device and the main circuit conductor. When this switchgear is used for power reception, the power cable 11 is pulled out of the panel and connected to a power system to take in power, and the power taken from the power cable 11 is used as the power receiving disconnecting switch 12- Power is supplied to another power supply switchgear constituting the train board through the circuit breaker 13-bus disconnector 14-busbar bushing 15-busbar 16, and power is supplied from this power switchgear to the load.
[0027]
In the switchgear configured as described above, the inside of one cubicle-shaped outer frame 30 has a cable room 31 in which the power cable 11 and the like are housed, a circuit breaker room 22 in which circuit breakers and disconnectors are housed, and a bus disconnection. It is divided into a disconnector room 25 in which the container is housed and a bus room 32 in which the bus 16 is housed. If an accident occurs in each room, it is prevented from affecting other rooms. In particular, a pressure relief device 23 is provided in the circuit breaker chamber 22 constituted by the closed container 21, which is set to perform a pressure release operation at a pressure lower than the pressure at which the second closed container 24 is broken. Therefore, even if an accident involving an arc occurs in the circuit breaker room and the pressure inside the room rises, when the set pressure is reached, the internal pressure is released and the internal pressure drops below the set pressure. The second closed container is prevented from being damaged, and the accident does not affect the bus bar bushing 15, that is, the bus bar 16, so that the safety of the device can be improved.
[0028]
Thus, the mechanical strength of the second hermetic container 24 accommodating the bus disconnector 14 does not need to be too high, so that the manufacturing cost of this container can be suppressed.
[0029]
【The invention's effect】
According to the present invention, the first hermetic container is inserted into the first hermetic container so as to partition the first hermetic container into a circuit breaker and a bus disconnector chamber. Therefore, there is no need to provide a special partition wall in the first closed container, and the bus disconnector can be incorporated in the second closed container outside the panel in advance, so that the assembling work is facilitated, The number of assembling steps can be reduced, and the production cost of the gas insulated switchgear can be reduced.
[0030]
In the case where the second hermetic container is formed of an insulating material, no insulation problem occurs even if the distance between the bus disconnector and the main circuit connecting conductor disposed inside the second hermetic container is reduced. Therefore, the bus disconnecting chamber of the second hermetic container can be reduced, and the device can be made smaller.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a main part of a gas insulated switchgear according to an embodiment of the present invention.
FIG. 2 is an exploded sectional view of a second closed container used in the present invention.
FIG. 3 is a perspective view showing an embodiment of a phase conductor arrangement conversion mechanism used in the present invention.
FIG. 4 is a longitudinal sectional view showing a main part of a conventional gas insulated switchgear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Power cable 12 Power receiving disconnector 13 Circuit breaker 14 Busbar disconnector 15 Busbar bushing 16 Busbar 21 First closed container 24 Second closed container 30 Outer frame.

Claims (5)

In a gas insulated switchgear that houses main circuit devices such as disconnector for power supply or power supply, circuit breaker, and bus disconnector in a sealed container filled with insulating gas, and connects each other with main circuit conductors, A first hermetic container filled with a conductive gas and a second hermetic container filled with an insulating gas, and accommodating a disconnector and a circuit breaker for receiving or supplying power in the first hermetic container; A gas insulated switchgear, wherein a bus disconnector is accommodated in the second hermetic container, and a second hermetic container accommodating the bus disconnector is hermetically inserted and disposed in the first hermetic container. apparatus. 2. The gas insulated switchgear according to claim 1, wherein an opening is provided in an upper portion of the second hermetic container, and the opening is hermetically sealed from above by a lid plate which is hermetically inserted through the busbar bushing. Characterized gas insulated switchgear. 3. The gas insulated switchgear according to claim 1, wherein an opening is provided in an upper portion of the first sealed container, and the second sealed container containing the bus disconnector is inserted through the opening into the first sealed container. 4. Wherein the opening is hermetically closed by a second hermetic container. The gas insulated switchgear according to any one of claims 1 to 3, wherein the second hermetic container is formed of an insulating material. The gas-insulated switchgear according to any one of claims 1 to 4, wherein a part of the first hermetic container is provided with a pressure lower than a pressure at which the second hermetic container is broken. A gas insulated switchgear, wherein a pressure releasing mechanism for releasing pressure to the outside is provided.

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