JP2013090534A - Gas insulated apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas insulated apparatus capable of performing foreign matter management while securing safety of an operator.SOLUTION: A gas insulated apparatus comprises: sealed containers 2 filled with insulating gases 4; high-voltage conductors 1 which are disposed in the sealed containers 2 and are applied with high-voltages for transmitting power; and insulating spacers 3 for supporting the high-voltage conductors 1 in the sealed containers 2. Further, stress light-emitting materials 9 which emit light due to collisions of foreign matters therewith are applied on inner surfaces of the sealed containers 2. The sealed containers 2 are provided with observing means for observing light emission of the stress light-emitting materials 9 so as to face the stress light-emitting materials 9.

Description

  Embodiments described herein relate generally to a gas insulating device in which an insulating gas is sealed in a sealed container. The present invention relates to a gas insulated switchgear used in a power plant, a substation, and the like, and a gas insulated bus provided therein.

  Currently, in high-voltage power systems such as high power plants and substations, various devices such as circuit breakers, switchgears, and transformers are arranged. These devices are connected to underground substations in urban areas. There is an urgent need to reduce the size of the equipment because there is a need for improved application and economic efficiency.

  In order to advance the downsizing of equipment, improvement of insulation performance plays an extremely important role. This is because with the progress of downsizing, the insulation distance between the high-voltage conductor inside the device and its container is shortened, and the risk of dielectric breakdown increases. Thus, many of these devices are configured as gas-insulated devices in which an insulating gas is sealed in a sealed container, so that the insulation performance is enhanced.

  As an example of the gas insulation device, a switchgear will be described as an example. As shown in FIG. 6, the switchgear includes a circuit breaker 21, a bus 22, a disconnector 23, a ground switch 24, a voltage transformer 25, and a cable head 26, and is controlled by a control panel 27. The circuit breaker 21 is connected to a bus 22 at one of its outlets. The other outlet is connected to a cable head 26 on the cable line side via a disconnector 23, a ground switch 24, a voltage transformer 25, and the like. Is connected. Each of these devices is electrically connected to each other by a high voltage conductor.

  As shown in FIG. 7, the high-voltage conductor 1 that connects each device is hollowly supported by an insulating spacer 3 that is an insulator, so that the high-voltage conductor 1 is inserted into the sealed container 2. The sealed container 2 and the high-voltage conductor 1 are electrically insulated by filling the inside with an insulating gas 4 for insulation and arc extinguishing.

  For this reason, the gas insulation apparatus is excellent in insulation performance and safety, and the installation space can be reduced. However, foreign substances are mixed in processes such as manufacturing, assembling, and transporting gas-insulated equipment, and there is a risk that these foreign substances will behave particularly in places where the electric field is high. Examples of the high electric field include the bottom surface electric field of the sealed container 2 or the creeping electric field of the insulating spacer 3. If the foreign substance behaves in such a place, there is a risk of dielectric breakdown due to the foreign substance behavior.

  Therefore, as a measure for suppressing the foreign substance behavior, it is conceivable to apply an insulating coating to a place where a high electric field is likely to occur (see, for example, Patent Document 1). An insulating coating such as a fluororesin coating is applied to the inner surface of the hermetic container 2, the creeping surface of the insulating spacer 3, and the peripheral surface of the high voltage conductor 1. Fluorocarbon resin coating has the ability to retain foreign matter and prevent the foreign matter from standing up and rising, and even if the foreign matter stands up and rises, it can prevent the destruction of the whole road by its excellent dielectric strength. it can.

  However, considering the rapid progress of downsizing of gas insulation equipment, it is considered that in the near future, even the current insulation coating will lack the ability to suppress foreign matter behavior.

  Therefore, in parallel with measures for suppressing foreign matter behavior, it is also necessary to aim to improve the foreign matter management ability of gas insulation equipment. In general, as a method for managing foreign matter, there is an ultrasonic diagnostic method for finding foreign matter that has moved inside the gas-insulated switchgear that is being operated by ultrasound (see, for example, Patent Document 2).

  In this method, an ultrasonic probe is attached to the surface of the sealed container 2, and the received ultrasonic signal is observed with an analyzer such as an oscilloscope. If a foreign object exists, the reflected wave from the foreign object can be analyzed based on the distance attenuation characteristics, and the presence and approximate position of the foreign object can be detected.

Japanese Patent No. 3028975 JP-A-10-160563

  In the foreign matter management method based on the ultrasonic diagnosis, an operator must approach the equipment while a voltage is applied to the gas insulation device. As a result, there is a risk of electric shock to the workers. Further, depending on the sensitivity of the ultrasonic sensor, there is a possibility that a foreign object cannot be found.

  Therefore, there is a need for a new method for foreign matter management that can ensure the safety of workers, increase the accuracy of foreign matter detection, and remove foreign matters more reliably.

  Embodiments of the present invention have been proposed to solve the above-described problems, and an object of the present invention is to provide a gas insulating device capable of performing foreign matter management while ensuring the safety of workers. .

  In order to achieve the above object, the gas insulating device of the embodiment includes a sealed container in which an insulating gas is sealed, a high voltage conductor that is inserted into the sealed container and applied with a high voltage for carrying power. And an insulating spacer for supporting the high voltage conductor in the sealed container. The inner surface of the sealed container is coated with a stress luminescent material that emits light when a foreign object collides, and observation means for observing the light emission is provided so as to face the stress luminescent material.

  In the gas insulating device according to another embodiment, the stress luminescent material is applied to the surface of the insulating spacer. Furthermore, in the gas insulating device according to another embodiment, the stress luminescent material is applied to the outer surface of the sealed container.

It is a schematic diagram which shows the high voltage conductor part of the gas insulation apparatus which concerns on 1st Embodiment. It is a simulation figure which shows the stress luminescent material which the gas insulated switchgear concerning a 1st embodiment has. It is a schematic diagram which shows the high voltage conductor part of the gas insulation apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows the high voltage conductor part of the gas insulation apparatus which concerns on 3rd Embodiment. It is a schematic diagram which shows the high voltage conductor part of the gas insulation apparatus which concerns on 4th Embodiment. It is a schematic diagram which shows the whole structure of the gas insulation switchgear which is an example of a gas insulation apparatus. It is a schematic diagram which shows the structure of the high voltage conductor part of the conventional gas insulation apparatus.

  Hereinafter, each embodiment of a gas insulation apparatus is concretely described with reference to drawings.

(First embodiment)
(Constitution)
First, the gas insulation apparatus according to the first embodiment will be described. FIG. 1 shows a high-voltage conductor 1 constituting a gas-insulated device according to the first embodiment and a sealed container 2 that accommodates the high-voltage conductor 1. 1A is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 as viewed from the side, and FIG. 1B is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 cut into a circle.

  As shown in FIG. 1, a high voltage conductor 1 is inserted into the sealed container 2. The high voltage conductor 1 is supported in a hollow state by an insulating spacer 3 so as to be separated from the inner surface of the sealed container 2. A stress-stimulated luminescent material 9 that emits light in response to the collision of a foreign object is applied to the inner surface of the sealed container 2. Further, the closed container 2 is provided with a monitoring window 10 and a light receiving portion 11 so as to face the stress luminescent material 9. The light receiving unit 11 is installed over the monitoring window 10.

The sealed container 2 is a metal container. An insulating gas 4 is sealed in the sealed container 2. Examples of the insulating gas 4 include SF ₆ gas. In recent years, SF ₆ gas is a gas with a high global warming potential, and therefore has been designated as an emission control target. Therefore, from the viewpoint of reducing the environmental load, naturally-derived gas, such as air, carbon dioxide, oxygen, nitrogen, or a mixed gas thereof may be used as the insulating gas 4 to be sealed.

  The insulating spacer 3 is an insulator and has a cone shape. A flange is formed at the bottom of the insulating spacer 3. The insulating spacer 3 is attached in the sealed container 2 in a state where the apex portion of the cone is aligned with the axis of the sealed container 2 by sandwiching a flange at the joint between the sealed containers 2.

  The cone apex portion of the insulating spacer 3 is a planar region. An opening that is slightly smaller than the planar region is provided in the planar region of the insulating spacer 3. A contact 7 is inserted into the opening of the insulating spacer 3. The contact 7 is a conductive cylinder longer than the thickness of the cone apex portion of the insulating spacer 3 and protrudes from both sides of the insulating spacer 3.

  The high voltage conductor 1 is a cylindrical body formed of a single material such as aluminum or copper, for example. The high-voltage conductor 1 is disposed opposite to the front and back surfaces of the cone apex portion of the insulating spacer 3 and substantially coincides with the axis of the sealed container 2. At least both ends of the high voltage conductor 1 are hollow portions. The high voltage conductor 1 is supported by the insulating spacer 3 through the contact 7 when the contact 7 penetrating the insulating spacer 3 is inserted into the hollow portion.

  In addition, conductive contacts 8 are provided inside both ends of the high-voltage conductor 1. The contact 8 is in contact with the periphery of the tip of the contact 7 and the inner surface of the high voltage conductor 1. That is, the high voltage conductor 1 is electrically connected to the adjacent high voltage conductor 1 via the contact 7 and the contact 8. In the busbar 22 or the middle end portion of the connection device, a plurality of high voltage conductors 1 are joined together by this electrical connection mode to form a single electric circuit as a whole.

  The stress-stimulated luminescent material 9 is applied to the lower part of both ends of the sealed container 2 and is adjacent to the insulating spacer 3. The application range extends from the position of the insulating spacer 3 to a length equivalent to the diameter of the sealed container 2 in the length direction of the sealed container 2 over about one third of the inner circumference in the circumferential direction of the sealed container 2. This application range means the vicinity of the junction of the sealed container 2 and the insulating spacer 3, and the possibility that foreign matter is present is higher than in other places and the electric field is higher than in other places, so that dielectric breakdown is likely to occur. is there.

  As shown in FIG. 2, the stress-stimulated luminescent material 9 is made by filling a transparent insulating resin 9b with a stress-stimulated light emitting element 9a that emits light by a mechanical external force. An example of the stress light emitting element 9a is an aluminate such as strontium aluminate. It is desirable that the stress light emitting element 9a has a particle size of several μm or less and is filled as much as possible with the transparent insulating resin 9b. This is because foreign substances that may exist in the gas-insulated equipment are often about 0.1 mm in size, so that such fine foreign substances can be detected with high accuracy.

  The monitoring window 10 and the light receiving unit 11 are monitoring means for observing the stress-stimulated luminescent material 9 applied to both ends of the sealed container 2, and the upper half side of the sealed container 2 and the sealed container so as to face the stressed luminescent material 9. A pair is arranged at both ends of the two. The light receiving unit 11 is, for example, a light receiving sensor such as a photocoupler or a video camera, and senses light emission of the stress light emitting material 9 through the monitoring window 10.

(Action / Effect)
The operation of such a gas insulating device will be described. First, there is a high possibility that the foreign matter exists in the vicinity of the joint portion of the sealed container 2 and the insulating spacer 3. Therefore, the foreign matter is likely to collide with the inner surfaces of both ends of the sealed container 2. And the stress luminescent material 9 is apply | coated to this collision position. When a foreign matter collides with the area where the stress-stimulated luminescent material 9 is applied, a mechanical external force such as an impact is applied to the stress-stimulated light-emitting element 9 a filled in the stress-stimulated luminescent material 9, thereby causing a light emission phenomenon.

  The light emitted from the stress light emitting element 9 a reaches the monitoring window 10 facing the stress light emitting material 9 and is captured by the light receiving unit 11 through the monitoring window 10. When the light receiving unit 11 senses light emission from the stress light emitting material 9, it indicates that a foreign substance exists at the light emitting position.

  Therefore, if the light receiving unit 11 is electrically connected to the notifying unit installed apart from the gas insulating device, and the notifying unit notifies the foreign object detection in response to the detection of the light receiving unit 11, the maintenance person Can detect the presence of foreign objects by remote monitoring without approaching the gas-insulated equipment.

  Examples of the notification means include a monitor, a speaker, a patrol lamp, and the like, and an image indicating foreign object detection may be displayed on the monitor, audio may be output from the speaker, or the patrol lamp may be turned on.

  As described above, the gas insulating apparatus according to the first embodiment is inserted into the sealed container 2 in which the insulating gas is sealed by supporting the high voltage conductor 1 with the insulating spacer 3. The stress luminescent material 9 was applied to the inner surface. Then, the light emission due to the collision of the foreign substance of the stress luminescent material 9 is observed by the observation window 10 or the light receiving unit 11. As a result, the presence of a foreign object can be remotely monitored, and the risk of electric shock from maintenance personnel can be avoided.

  Further, in the first embodiment, the insulating luminescent material 9 is extended from the position of the insulating spacer 3 to the length equivalent to the diameter of the sealed container 2 over a third of the circumference at the lower part of the sealed container 2. 3 was applied to both ends of the airtight container 2 adjacent to 3. That is, since the possibility of the presence of foreign matter is higher than in other places and the electric field is higher than in other places, the position where dielectric breakdown is likely to occur is intensively monitored. Thereby, a foreign material can be detected and removed effectively, and the dimension of an apparatus can be reduced efficiently, ensuring the insulation performance of a gas insulation apparatus efficiently.

(Second Embodiment)
(Constitution)
The gas insulation apparatus according to the second embodiment will be described in detail with reference to FIG. FIG. 3 is a schematic diagram showing the high-voltage conductor 1 and the sealed container 2 of the gas insulation device according to the second embodiment. 3A is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 as viewed from the side, and FIG. 3B is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 cut in a circle.

  As shown in FIG. 3, in the gas insulating device according to the second embodiment, the stress luminescent material 9 is applied to the outer surface of the sealed container 2. Specifically, the stress-stimulated luminescent material 9 is applied to the lower portions of both ends of the outer surface of the sealed container 2, and the application range is about one third of the inner circumference in the circumferential direction of the sealed container 2. In the vertical direction, it extends from the position of the insulating spacer 3 to a length equivalent to the diameter of the sealed container 2.

  In a gas insulated switchgear which is a kind of gas insulated equipment, when a test is performed at a voltage higher than the operating voltage, the behavior of the foreign matter becomes intense, and the stress when the foreign matter collides with the closed vessel 2 is Reach to the outside. Therefore, even when the stress-stimulated luminescent material 9 is applied to the outer surface of the sealed container 2, the stress-stimulated luminescent material 9 can emit light upon detecting the collision of a foreign object.

  Therefore, when the stress-stimulated luminescent material 9 is applied to the outer surface of the sealed container 2, the presence of a foreign object can be monitored from the outside of the gas-insulated device by direct visual recognition by a maintenance person. The manufacturing cost of gas insulation equipment can be reduced. In addition to direct visual recognition, a light receiving unit 11 such as a light receiving sensor or a video camera may be installed outside the gas insulating device.

(Third embodiment)
The gas insulation apparatus according to the third embodiment will be described in detail with reference to FIG. FIG. 4 is a schematic diagram showing a high-voltage conductor 1 and a sealed container 2 of a gas insulating device according to the third embodiment. 4A is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 as viewed from the side, and FIG. 4B is a cross-sectional view of the high-voltage conductor 1 and the sealed container 2 cut in a circle.

  In the gas insulating device according to the third embodiment, the stress-stimulated luminescent material 9 is applied to both the outer surface and the inner surface of the sealed container 2. The application range is the lower part of both ends of the sealed container 2, and extends from the position of the insulating spacer 3 in the length direction of the sealed container 2 over about one third of the inner circumference in the circumferential direction of the sealed container 2. It extends to a length equivalent to the diameter of the sealed container 2.

  In this gas insulating device, the foreign substance behavior due to the operating voltage can be monitored from the monitoring window 10 of the sealed container 2, and when the foreign substance behavior is severe, the light emission can also be observed from the outside of the sealed container 2. Therefore, a gas insulation apparatus can be manufactured in the state which managed foreign substances highly, and a high quality gas insulation apparatus can be provided.

(Fourth embodiment)
The gas insulation apparatus according to the fourth embodiment will be described in detail with reference to FIG. FIG. 5: is sectional drawing which looked at the high voltage conductor 1 and the airtight container 2 of the gas insulation apparatus which concern on 4th Embodiment from the side surface.

  As shown in FIG. 5, the stress-stimulated luminescent material 9 can be applied or filled on the surface or surface layer of an insulator such as the insulating spacer 3. Similar to the case where the stress-stimulated luminescent material 9 is applied to the inner surface or the outer surface of the sealed container 2, it is possible to capture light emission when a foreign object collides with an insulating material such as the insulating spacer 3. Since the presence position can be easily confirmed, it is possible to obtain detailed information for abnormality diagnosis and foreign matter removal of the gas insulation device.

(Other embodiments)
As mentioned above, although several embodiment concerning this invention was described in this specification, these embodiment was shown as an example and is not intending limiting the range of invention. A combination of all or any of the embodiments is also included in the scope of the invention. Each embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

  For example, in the embodiment, the application range of the stress-stimulated luminescent material 9 is set at a position adjacent to the insulating spacers 3 at the lower ends of both ends of the sealed container 2, in the circumferential direction of the sealed container 2, in the longitudinal direction over about one third of the inner circumference. The length of the insulating spacer 3 is equal to the diameter of the sealed container 2. This application range is intended to focus particularly on a portion where a foreign substance is likely to exist and a high electric field is applied, but the present invention is not limited to this, and the stress-stimulated luminescent material 9 can be applied to various places.

  As an example, the stress-stimulated luminescent material 9 may be applied near the center of the lower part of the sealed container 2. When the sealed container 2 is long, a monitoring window 10 and a light receiving unit 11 may be provided near the center in addition to both ends so that the stress-stimulated luminescent material 9 applied near the center can be easily observed. On the other hand, when the sealed container 2 is short and the entire area of the sealed container 2 can be observed with one monitoring window 10, the monitoring window 10 is installed at one place where the entire area of all the stress-stimulated luminescent materials 9 can be seen. May be.

DESCRIPTION OF SYMBOLS 1 High voltage conductor 2 Airtight container 3 Insulating spacer 4 Insulating gas 7 Contact 8 Contact 9 Stress light emitting material 9a Stress light emitting element 9b Transparent insulating resin 10 Monitoring window 11 Light-receiving part 21 Breaker 22 Bus 23 Disconnector 24 Grounding switch 25 Voltage transformer 26 Cable head 27 Control panel

Claims (9)

A sealed container filled with insulating gas;
A high-voltage conductor inserted into the sealed container and applied with a high voltage for carrying power; and
An insulating spacer for supporting the high-voltage conductor in the sealed container;
A stress-stimulated luminescent material that is applied to the inner surface of the sealed container and emits light when a foreign object collides;
An observation means for observing the emission;
Providing
Gas insulation equipment characterized by. A sealed container filled with insulating gas;
A high-voltage conductor inserted into the sealed container and applied with a high voltage for carrying power; and
An insulating spacer for supporting the high-voltage conductor in the sealed container;
A stress-stimulated luminescent material that is applied to the surface of the insulating spacer or filled in a surface layer and emits light by collision of foreign matter;
An observation means for observing the emission;
Providing
Gas insulation equipment characterized by. The monitoring means is a monitoring window provided in a sealed container;
The gas insulation apparatus according to claim 1 or 2, characterized in that. The monitoring means includes
Including light receiving means for observing light emission of the stress luminescent material through the monitoring window;
The gas insulation apparatus according to claim 3. A sealed container filled with insulating gas;
A high-voltage conductor inserted into the sealed container and applied with a high voltage for carrying power; and
An insulating spacer for supporting the high-voltage conductor in the sealed container;
A stress-stimulated luminescent material that is applied to the outer surface of the sealed container and emits light when a foreign object collides;
Providing
Gas insulation equipment characterized by. The stress-stimulated luminescent material is
Applied to the lower part of the sealed container over one third of the circumference;
The gas insulation apparatus according to claim 1 or 5, characterized in that. The stress-stimulated luminescent material is applied to both ends of the sealed container adjacent to the insulating spacer;
The gas insulation apparatus according to claim 1, 5, or 6. The stress-stimulated luminescent material is applied in the axial direction of the sealed container from the insulating spacer over a length equivalent to the diameter of the sealed container;
The gas insulation apparatus according to claim 1, wherein The stress-stimulated luminescent material is formed by filling a stress-stimulated light emitting element having a particle size of several μm or less into a transparent insulating resin,
A gas insulating device according to any one of claims 1 to 8, wherein

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