JPH0794335A - Abnormality detector of oil-immersed induction machine pressure-relief plate - Google Patents

Abstract

PURPOSE:To obtain an abnormality detector an oil-immersed induction machine pressure-relief plate, wherein the detector is capable of accurately detecting abnormalities in a pressure-relief plate and a gasket in an early stage without operation at an elevated spot. CONSTITUTION:An abnormality detector is provided to an oil-immersed induction machine equipped with a tank which is filled with insulating oil and wherein the content of a stationary induction machine is housed, a pressure-relief device equipped with a bursting tube provided protruding from the above tank and a pressure-relief plate linked to the tip of the pressure-relief tube, an oil conduit 9 connected to the pressure-relief device, and an oil conduit cover 11 which is connected to the lower end of the oil conduit 9 in a freely closable manner and kept in an open state sensing a rise in the inner pressure of the oil conduit 9, wherein abnormalities in the pressure-relief plate are detected based on the leakage of insulating oil into the oil conduit 9. Therefore, the detector comprises a leakage oil storage container 21 which is provided protruding downwards from the oil conduit cover 11 and provided with a transparent part through which the amount of leakage oil is observed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents an oil-filled transformer such as an oil-filled transformer or an oil-filled reactor from abnormally increasing the internal pressure of the tank due to arc discharge in the tank. The present invention relates to an abnormality detection device that detects oil leakage due to aging deterioration of a pressure relief plate that is provided for the purpose of protection.

[0002]

2. Description of the Related Art FIG. 4 is a schematic cross-sectional view showing an oil-filled induction machine equipped with a pressure release device, and FIG. 5 is an enlarged cross-sectional view of a portion A of FIG. In the figure, an iron core 2, a winding 3 wound around a main leg of the iron core 2, and a pair of upper and lower frames 4A, 4B that engage with the upper and lower yokes of the iron core 2 to apply a tightening load to the winding 3. The oil-filled induction-electric-generator contents (for example, the transformer contents) 1 constituted by are stored in the tank 5 enclosing the insulating oil 19, and the insulation performance and cooling performance of the winding wire 3 are maintained. Further, the tank 1 has a pressure release pipe 6 protruding upward from its cover plate, a pressure release device 7 having a pressure release plate 10 connected to the tip thereof, and an oil guide pipe 9 connected to this pressure release device. And an oil-conducting pipe cover 11 that is openably and closably connected to the lower end of the oil-conducting pipe close to the surface of the earth and senses an increase in the internal pressure of the oil-conducting pipe and is in an open state. When an arc discharge is generated in the tank 5, the insulating oil is decomposed by the arc heat, and the generated decomposition gas causes a rapid increase in the internal pressure of the tank 5. The pressure release device 7 detects this increase in pressure early. The pressure inside the oil guiding pipe 9 rises at the same time when the pressure releasing plate 10 is pierced, and the oil guiding pipe cover is opened by this pressure, so that the insulating oil 19 containing the decomposed gas is discharged to the outside through the oil guiding pipe 9. , The internal pressure of the tank 5 is the operating pressure of the pressure relief device 7. Thereby preventing the destruction of the tank 5 by suppressing the bottom adapted to collect insulating oil 19 discharged into leakage oil tank 18 immediately below the oil guiding tube to prevent contamination of the environment.

In the oil-filled induction machine having the pressure-release device 7 thus constructed, the pressure-release plate 10 is made of, for example, a thin phenol resin laminated plate or a heat-resistant plastic plate, and the surface on the pressure-release pipe 6 side is formed. Since it is in constant contact with the high-temperature insulating oil 19 and the other surface is in contact with air, it gradually deteriorates over the years, causing abnormalities such as cracks and cracks, causing oil leaks and oil seals. There is a high possibility that an oil leakage accident will occur, such as an abnormality occurring in the gasket 7A for use as an oil leak. Therefore, a peep window 8 is provided at a position where the pressure relief plate 10 can be viewed, and the state of the pressure relief plate 10 and oil leakage are visually inspected, and abnormalities of the pressure relief plate and the gasket are detected at an early stage to cause a large amount of oil leakage accident. There is known an oil-filled induction electric device provided with an abnormality monitoring device for preventing the above.

[0004]

In the conventional abnormality monitoring device in which the viewing window 8 is provided in the vicinity of the pressure relief plate 10, since the pressure relief plate is located at a position much higher than the tank of the oil-filled induction electric device, An inspection stand is required to ascend to a high place for the visual inspection work, which not only makes the configuration of the abnormality monitoring device large, but also causes a fatal risk of falling from the inspection stand during the visual inspection work. There are drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to obtain an oil-filled induction-electric-device pressure-release plate abnormality detecting device capable of detecting abnormality in the pressure-release plate and gasket early and accurately without involving work at height.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a tank for accommodating insulating oil and the contents of a static induction electric device therein, and a pressure relief pipe projecting upward from this tank. And a pressure release device having a pressure release plate connected to the tip thereof, and an oil guide pipe connected to the pressure release device,
An oil-filled induction machine equipped with an oil-conducting pipe cover that is openably and closably connected to the lower end of the oil-conducting pipe and detects an increase in the internal pressure of the oil-conducting pipe to open the oil-releasing plate. It is to be detected by the occurrence of oil leakage to the oil-conducting pipe cover, and it comprises a storage container for oil leakage projecting downward from the oil guide pipe cover, and comprises a transparent portion for monitoring the amount of oil leakage.

It is assumed that the oil leakage storage container is formed as a transparent container. The oil leakage storage container shall consist of an opaque container with a viewing window. The oil guide pipe cover is formed in a funnel shape, and an oil leak storage container is connected to the lower end portion thereof, and the oil guide pipe is provided with a drip-proof umbrella covering the outer peripheral side of the oil guide pipe cover at the lower end portion thereof. And

[0008]

In the present invention, an oil-filled induction electric machine equipped with an oil-conducting pipe cover which is openably and closably connected to the lower end of the oil-conducting pipe and is opened when sensing an increase in internal pressure of the oil-conducting pipe.
It consists of a storage container for oil leaks that protrudes downward from, and is configured to be equipped with an abnormality detection device for the pressure relief plate that has a transparent part that monitors the amount of oil leakage. Oil leaks can be easily and early detected by visual inspection on the ground, eliminating the work of aerial inspection and inspection racks, which were problems with the conventional technology, simplifying the configuration of the abnormality monitoring device, and improving work safety. In addition, a function that enables early detection of oil leakage is obtained.

Further, if a transparent glass container or a plastic container is used as the oil leakage storage container, visual inspection can be facilitated, and a function of detecting oil leakage early and accurately can be obtained.
Furthermore, if the oil leakage storage container is an opaque container having a viewing window, a function of preventing damage due to external force can be obtained by using a strong oil leakage storage container made of metal, for example. On the other hand, if the oil guide pipe cover is formed in a funnel shape and the oil leak storage container is connected to the lower end portion thereof, and the lower end portion of the oil guide pipe is provided with the drip-proof umbrella covering the outer peripheral side of the oil guide pipe cover, A small amount of oil leaking along the inner surface of the oil guide pipe is collected in the oil leak storage container to obtain the function of improving the abnormality detection accuracy of the pressure relief plate and the gasket, and also in the outdoor oil-filled induction machine. It is possible to obtain the function of eliminating the influence of rain and dew and preventing a decrease in abnormality detection accuracy.

[0010]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a cross-sectional view of a main part showing an abnormality detecting device for an oil-filled induction electric device pressure release plate according to an embodiment of the present invention. Omit it. In the figure, a lower end portion of the oil guide pipe 9 that descends from the pressure release device to the ground surface is openably and closably connected by a hinge 12 and a stopper 13 to detect an increase in internal pressure of the oil guide pipe 9 caused by the pressure release device. The oil guide pipe cover 11 in the open state is provided with a mouthpiece 14 having a male screw projecting downward, and an oil leakage storage container 21 formed of a transparent glass cup or a transparent plastic cup is provided in the mouthpiece 14.
An abnormality detection device for the oil-filled induction electric discharge plate is constructed by screwing to the.

In the oil-filled induction device having the transparent oil leakage storage container 21 as the abnormality detecting device constructed as described above, a small amount of oil leakage caused by deterioration of the pressure relief plate or the gasket is A transparent oil leakage storage container 2 that is located near the surface of the earth along the upper surface of the oil guide pipe cover 11.
Since it collects in 1, the oil leakage 29 in the transparent oil leakage storage container 21
By regularly monitoring the presence or absence of the above or its increasing speed by visual inspection on the ground, abnormalities such as cracks in the pressure relief plate and deterioration of the gasket can be accurately and easily and quickly from the occurrence to the spread of damage. Since it can be detected, there is an advantage that the oil leak can be detected early. In addition, by using the simplified abnormality monitoring device, the high-altitude inspection work and the inspection stand, which are problematic in the conventional abnormality monitoring device 8 (see FIG. 4) having a viewing window at a high place near the pressure relief plate, are eliminated. The advantage of being able to perform visual inspection safely and efficiently is obtained.

FIG. 2 is a cross-sectional view of an essential part showing an abnormality detecting device for an oil-filled induction electric device pressure release plate according to another embodiment of the present invention, in which an oil leakage storage container 31 as an abnormality detecting device is made of, for example, a metal opaque material. This is different from the above-described embodiment in that the side wall surface of the cup is provided with the viewing window 32, and an abnormality detection device having a strong oil leakage storage container that is not easily damaged by external force can be obtained.

FIG. 3 is a cross-sectional view of the essential part showing an abnormality detecting device for an oil-filled induction electric device pressure plate according to another embodiment of the present invention. The oil guide pipe cover 41 is formed in a funnel shape and the lower end portion thereof is shown. The oil-leakage storage container composed of the transparent cup 21 or the opaque cup 31 is connected to the above, and a drip-proof umbrella 42 is provided at the lower end portion of the oil guide pipe 9 to cover the oil guide pipe cover 41 from its outer peripheral side. Different from each example, it collects all the small amount of oil leaking down the inner surface of the oil guide pipe to improve the accuracy of abnormality detection of the pressure relief plate and the gasket, and it can also be used for outdoor installation oil-filled induction There is an advantage that the influence of is eliminated to prevent the deterioration of the abnormality detection accuracy.

[0014]

As described above, the present invention provides an oil-filled induction machine equipped with an oil-conducting pipe cover which is openably and closably connected to the lower end of the oil-conducting pipe and which is opened when it senses an increase in internal pressure of the oil-conducting pipe. ,
It is configured to provide an abnormality detection device for the pressure relief plate, which is composed of an oil leakage storage container protruding downward from the oil guide pipe cover and has a transparent portion for monitoring the oil leakage amount. As a result, a small amount of oil leakage caused by an abnormality in the pressure relief plate or gasket can be easily and early detected by visual inspection on the ground.
High-level inspection work and inspection stand, which were problems with the conventional technology, are unnecessary, and the inspection work is safe, and the oil-filling induction is equipped with a simple structure of the pressure release plate abnormality monitoring device with excellent early oil leak detection performance. The electric appliance can be provided economically and advantageously.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing an abnormality detecting device for an oil-filled induction-electric discharge plate according to an embodiment of the present invention.

FIG. 2 is a sectional view of essential parts showing an abnormality detecting device for an oil-filled induction device pressure release plate according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing an abnormality detecting device for an oil-filled induction device pressure release plate according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view schematically showing an oil-filled induction device including a pressure release device.

FIG. 5 is an enlarged cross-sectional view of FIG. 4A part.

[Explanation of symbols]

 1 Transformer Contents 2 Iron Core 3 Winding 4A Upper Frame 4B Lower Frame 5 Tank 6 Pressure Release Pipe 7 Pressure Release Device 8 Viewing Window (Abnormality Monitoring Device) 9 Oil Pipe 10 Pressure Release Plate 11 Oil Pipe Cover 12 Hinge 13 Stopper 14 Base 19 Insulating Oil 21 Oil Leakage Storage Container (Transparent Cup) 29 Oil Leakage 31 Oil Leakage Storage Container (Opaque Cup) 32 Peep Window 41 Oil Pipe Cover 42 Drip-proof Umbrella

Claims (4)

[Claims] 1. A tank for accommodating insulating oil and the contents of a static induction electric device inside, a pressure relief pipe projecting upward from the tank and a pressure relief device connected to the tip of the pressure relief device, and this pressure relief device. An oil-filled induction machine equipped with an oil-conducting pipe connected to a pressure device, and an oil-conducting pipe cover that is openably and closably connected to the lower end of the oil-conducting pipe to detect an increase in the internal pressure of the oil-conducting pipe and open. For detecting an abnormality of the pressure relief plate by occurrence of oil leakage into the oil guide pipe, and comprising an oil leak storage container projecting downward from the oil guide pipe cover, and monitoring the amount of oil leak. An abnormality detecting device for an oil-filled induction device pressure-release plate, characterized by comprising a transparent portion. 2. An abnormality detecting device for an oil-filled induction-electric pressure plate according to claim 1, wherein the oil leakage storage container is formed as a transparent container. 3. The abnormality detecting device for an oil-filled induction device pressure-release plate according to claim 1, wherein the oil leakage storage container is an opaque container having a viewing window. 4. A drip-proof umbrella in which an oil guide pipe cover is formed in a funnel shape, and a lower end portion of the oil guide pipe cover is connected to a storage container for oil leakage, and the oil guide pipe covers the outer peripheral side of the oil guide pipe cover at its lower end portion. The abnormality detection device for an oil-filled induction electric device pressure release plate according to claim 1, further comprising: