JPS61189446A - X-ray external diagnosing method for gas insulating electric equipment - Google Patents

Abstract

PURPOSE:To specify an abnormal position by arranging a check plate interrupting the transmission of X-rays on the outer wall of a closed container, setting up a film on the upper part of the check plate and executing X-ray irradiation photographing from two positions symmetrical with the film about the center of the container. CONSTITUTION:If a defect is generated in a bolt Z which is a constitutional parts of a gas insulating electric equipment arranged in a closed container 1, X-ray photographing is executed to specify the defect. A small check plate 12 consisting of a material such as a lead plate interrupting the transmission of X rays is fitted to a part of the outer wall of the container 1 and the a film 13 is adhered to the surface of the check plate 12. An X-ray device 11 is arranged on a position symmetrical with the fitting position of the check plate 12, i.e. on a position turned by 180 deg. on the outside of the container. X rays are irradiated from the 1st position of the device 11 and then the device 11 is moved to the 2nd position to irradiate X rays from the 2nd position. The changing value of DELTAy which is the changing value of the image of the bolt 2 to the moving distance DELTAx of the device 11 is found out from the film 13 to find out a distance (a) from the outer periphery of the container 17 to the bolt 2. Thus, the bolt generating a defect can be specified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an external X-ray diagnosis method for gas-insulated electrical equipment, which is used for inspecting the internal structure of gas-insulated electrical equipment such as gas-insulated switchgear. .

[Technical background of the invention]

Currently, gas insulated switchgear is used in various places, and the need for equipment inspection is increasing accordingly. However, in a gas-insulated switchgear, the internal structure is installed in a metal sealed container, and the container is filled with SF and gas as an insulating material. Therefore, in order to visually inspect the internal structure, the SF in the sealed container,
Gas must be detected and released. Recently, as a method to inspect internal equipment without increasing costs and inspection time, the internal structures of the switchgear are photographed from the outside using X-rays, etc. For example, Japanese Patent Application Laid-Open No. 55-133622 to check for abnormalities.
An X-ray external diagnostic method, as known from the publication No. 1, is employed.

[Problems with background technology]

Photographs of each component in the internal structure of a gas-insulated switchgear taken on film using this external diagnostic method using X-rays or the like are displayed in a planar manner. Therefore, the relative positional relationship of each component in the X-ray irradiation direction tends to become unclear. on the other hand,
In general, gas-insulated switchgear often uses several or more parts of the same type, such as bolts, in close proximity, and even if one of them becomes loose and this is discovered by X-ray photography, It is difficult to determine which bolt it is. Similarly, even if a foreign object is found to be present, it is difficult to determine its positional relationship with respect to the vertical direction of the film, so identification is an extremely important issue in this type of external X-ray diagnosis method. .

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to
X-ray technology for gas-insulated electrical equipment that allows the location of abnormal parts or foreign objects to be easily determined from X-ray film, shortens inspection time, and improves the reliability of external X-ray diagnosis. The object of the present invention is to provide an extra-radiodiagnostic method.

[Summary of the Invention] In order to achieve the above object, the present invention includes attaching a confirmation plate made of a material that does not easily transmit X-rays to the outer wall of the airtight container of gas-insulated electrical equipment, and placing a film on the confirmation plate. Attach the film to two locations on the outside of the sealed container that are 180 degrees different from the location where the film was applied. The object is photographed by irradiating it into a closed container, and the object to be photographed can be identified from the amount of change captured on film.

[Embodiments of the invention]

An embodiment of the present invention will be specifically described below with reference to the drawings.

When it is discovered from the X-ray external diagnostic film that an abnormality has occurred in the bolt 2, which is a component of the internal structure of gas-insulated electrical equipment installed in the sealed container 1, it is determined whether the bolt 2 is An X-ray photograph is taken to identify the material used in the part, and the determination is made based on this. That is, a small confirmation plate 12 made of a material that is difficult to transmit X-rays, such as a lead plate, is attached to a part of the outer wall of the closed container 1, and a film 13 is pasted thereon. This confirmation board 12
The X-ray device 11 is placed at a position symmetrical to the mounting position of the X-ray device 1, that is, outside the sealed container 1, which is 1800 different from the installation position. M of this device 11
X-rays are irradiated from position 1, and then the X-ray device 11 is moved to the second position, that is, the X-ray irradiation position is moved slightly, and X-ray photography is performed under the same conditions. In this case, since the film 13 is pasted on the confirmation plate 12, the position of the image of the confirmation plate 12 taken on the film 13 can be considered to be taken as a fixed point, but the image of the bolt 2 The position of is X
By moving the line irradiation position by a distance ΔX, the confirmation plate 12
This causes a change in the distance from the image position. The rate of change is determined by moving the X-ray device 11 as shown in the figure.
When the movement distance of the X-ray irradiation position is ΔX, the change value of the distance between the confirmation plate 12 on the photographic film 13 and the image of the bolt 2 is ΔY s The distance between the film 13 and the X-ray irradiation position is 11
Since a, ΔX, Δy, and l are known quantities for the distance between the film 13 and the bolt 2, the distance a between the film 13 and the bolt 2 can be determined. At this time, since the film 13 is pasted on the sealed container 1, the distance a can be regarded as the distance between the outer periphery of the sealed container 1 and the bolt 2, and the distance l between the film 13 and the X1s irradiation position is the distance between the sealed container 1 and the bolt 2. Since the distance between the outer periphery of the closed container 1 and the X-ray irradiation position is smaller than the outer diameter of the closed container 1, it can be approximately equal to the outer diameter of the closed container 1. Therefore, the distance from the outer periphery of the closed container 1 to the bolt 2 can be easily determined by determining the amount of change in Δy, which is the change value of the image of the bolt 2 with respect to the moving distance ΔX of the X-ray device 11, using the photographic film 13. Therefore, it is possible to detect the bolt that is causing the abnormality.

In the above embodiment, the case where the X@irradiation position was moved in the axial direction of the closed container 1 was described, but the container 1
Even if the bolt 2 is moved in the circumferential direction, a similar relational expression holds, and the position of the target bolt 2 can be easily determined.

〔Effect of the invention〕

As explained above, according to the X-ray external diagnosis method of the present invention, by moving the X-ray irradiation position and performing X-ray photography from two locations, the position of the object causing the abnormality can be determined from the photographic film. can be easily determined. Therefore, X-ray external diagnosis can be carried out efficiently.

[Brief explanation of drawings]

The figure is a side view showing the X-ray external diagnosis method for gas-insulated electrical equipment according to the present invention. 1...Airtight container 2...Bolt 11...X
Line device 12... Confirmation plate 13... Film

Claims (1)

[Claims] X-ray inspection of the internal structure inside the sealed container of gas-insulated electrical equipment by taking X-rays from outside the sealed container
In the external radiological diagnosis method, a confirmation plate made of a material that is difficult for X-rays to pass through is placed on the outer wall of a closed container, and a film is placed on top of the confirmation board. Perform X-ray irradiation photography from the position, and determine the position of the component to be photographed from the difference in distance between the confirmation plate on each photographed film and the component to be photographed, and the distance traveled by the X-ray irradiation position. An external X-ray diagnostic method for gas insulated electrical equipment characterized by the following: