JPH08159909A - Leak detection device of sealed medium - Google Patents

Abstract

PURPOSE: To eliminate a need of installing a sealed-medium receiver member outside a detection device. CONSTITUTION: A terminal 11 connected to a transformer body for an oil- immersed transformer in which an insulating medium or the like has been sealed is installed. The terminal 11 has a structure in which a conductor 13 is passed through the center of a flange 12 constituted of an insulator, and the flange 12 is fixed, by setscrews, to a flange mounting body 16 attached to the outer circumference of a through hole 15 made in a lower-part wall 14 for a container body 10. At this time, in order to prevent an oil from being leaked to the outside from the inside of the container body 10, an O-ring 17 is installed at the flange mounting body 16. A circular groove part 19 is formed in the flange 12 in a part situated outside the position of the O-ring 17 and inside the setscrew positions 18. Electrodes 21, 22 are installed over the whole circumference in the groove part 19. Lead wires 23, 24 are connected to the electrodes 21, 22, and measuring terminals 26, 27 are attached to the lead wires 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting leakage of a sealed medium from a container such as an oil-filled transformer in which a medium for insulation or cooling is sealed.

[0002]

2. Description of the Related Art FIG. 3 shows a structure of a terminal portion of an oil-filled transformer, for example. In FIGS. 3A and 3B, 31 is a container body of the oil-filled transformer, and a side wall 32 of the container body 31 has an internal structure. A terminal 33 connected to the transformer body (not shown) is provided. The terminal 33 is formed in a structure that is insulated from the container body 31. The terminal 33 is a flange 3 made of an insulator.
In the structure in which the conductor 35 penetrates through the central portion of 4, the flange 34 is fixed by a set screw 38 to a flange mounting body 37 mounted around a through hole 36 formed in the side wall 32. At this time, in order to prevent oil from leaking from the inside of the container body 31, the flange mounting body 37
An O-ring 39 is provided on the.

In the oil-filled transformer constructed as described above, the O-ring 39 deteriorates due to aging and the like, and the container body 3
Oil may leak from inside 1. Therefore, terminal 3
The oil receiving member 40 is provided on the side wall 32 below 3, and the oil receiving member 40 receives the leaked oil. The oil receiving member 40 is provided with a pipe 41 directed downward, and an oil sump 4 is provided at a tip portion of the pipe 41.
2 is formed. Electrodes 43 and 44 are provided opposite to the oil sump 42, and the capacitance change between the electrodes 43 and 44 can be measured by a capacitance meter 45. The value measured by the capacitance meter 45 is supplied to the controller 46, the degree of oil leakage is checked, and an alarm or the like is issued when the value exceeds a certain value.

[0004]

In the oil-filled transformer shown in FIG. 3, the flange 34 is the side wall 32 of the container body 31.
However, in the case of the structure in which the flange 34 is provided in the lower portion of the container body 31 as shown in FIG. 4, the oil receiving member 40 (omitted in FIG. 4) is attached to the portion of the conductor 47 of the terminal 33. Only the one that comes into contact with can receive the leaked oil completely. Therefore, when the oil receiving member is manufactured, it is necessary to consider the insulating property, and thus there is a problem that the design is difficult. Further, in either of the cases of FIG. 3 and FIG. 4, there is a problem that the oil receiving member and the electrode for oil leakage detection must be provided outside the device.

The present invention has been made in view of the above circumstances, and provides a sealed medium leak detection device capable of detecting a sealed leak without considering the insulating property and eliminating the need for providing a sealed medium receiving member outside the device. The purpose is to do.

[0006]

In order to achieve the above object, the present invention provides a container body in which an insulating medium is enclosed, and an outer wall of the container body. An insulative flange having a conductor to be connected to a device, a flange mount fixed to the container body for mounting the flange, and a flange mount provided on the flange mount to prevent leakage of an insulating medium in the container body. Insulating medium leakage preventing member, a groove portion formed on the flange for receiving the insulating medium leaking out from the container body due to deterioration of the insulating medium leakage preventing member, an electrode arranged to face the groove portion, and this electrode And a capacitance measuring device that measures the capacitance between the electrodes according to the amount of insulating medium that enters the groove, and the capacitance measured by this capacitance measuring device exceeds a preset value. To come, in which a detection device to detect that a leakage of the insulating medium.

A second aspect of the invention is characterized in that the groove is formed inside a position where the flange is fixed to the flange mounting body and outside the position in the insulating medium leakage prevention member.

[0008]

A flange is provided with a groove, an electrode is arranged in the groove, and the amount of the insulating medium entering into the groove is captured as a capacitance between the electrodes, whereby a receiving member for detecting leakage of the insulating medium is obtained. It is not necessary to provide a device outside the container body. Also, even if the position of the flange is the bottom of the container body,
It can also be used on the side wall.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A, 1B, 1C, a terminal 11 is provided which is connected to a transformer body inside a container body 10 such as an oil-filled transformer in which an insulating medium or the like is enclosed. This terminal 1
Reference numeral 1 denotes a structure in which a conductor 13 penetrates through a central portion of a flange 12 made of an insulating material.
It is fixed to a flange mounting body 16 attached to the outer periphery of a through hole 15 formed in the lower wall 14 of the above with a set screw (not shown). At this time, in order to prevent oil from leaking from the inside of the container body 10 to the outside, the flange attachment body 16 is provided with an O-ring 17. On the flange 12, outside the position of the O-ring 17,
A circular groove portion 19 is provided at a portion located inside the set screw position 18. As shown in the enlarged view of FIG. 1C, electrodes 21 and 22 are provided in the groove portion 19 so as to face both sides of the groove portion 19 over the entire circumference. Lead wires 23 and 24 are connected to the electrodes 21 and 22, respectively.
Are led out to the outer peripheral wall 25 of the flange 12. At the tips of the lead wires 23, 24 of the outer peripheral wall 25, measuring terminals 26, 2
7 is attached. The capacitance terminals 45 shown in FIG. 3 are connected to the measurement terminals 26 and 27, and a controller 46 is connected to the capacitance meters 45.

Using the embodiment configured as described above,
The terminal 11 is provided on the lower wall 14 of the container body 10, and even if oil, which is an insulating medium, leaks out due to deterioration of the O-ring 17, the oil enters the groove 19. Since the groove portion 19 is provided with the electrodes 21 and 22, the capacitance between the electrodes 21 and 22 gradually increases according to the amount of oil leaked out. The capacitance is the capacitance meter 45
The oil leak can be immediately detected by measuring with. With such a structure, oil leakage can be detected without providing an oil receiving member outside. Also, oil leakage can be detected without having to consider insulation with the conductor portion of the terminal 11 connected to the conductor 12. Although the terminal 11 has been described as being provided on the lower wall 14 of the container body 10,
The same effect can be obtained when it is provided on the side wall.

[0011]

As described above, according to the present invention,
Even when the terminal is provided in the lower portion of the container body, it is possible to detect an insulating medium such as oil leakage without considering insulation with the conductor portion. Further, there is an advantage that it is not necessary to provide a member for receiving the insulating medium outside the device,

[Brief description of drawings]

1 shows an embodiment of the present invention, A is a sectional view, B is a bottom view of a flanged terminal, and C is an enlarged view of a groove portion and an electrode portion.

FIG. 2 is a partial cross-sectional view of an essential part of the above embodiment showing an enlarged Z portion of FIG. 1B.

FIG. 3 shows a conventional example, in which A is a side view of a flanged terminal, and B is a side sectional view equipped with an oil leak measuring device.

FIG. 4 is a sectional view showing another example of the conventional example.

[Explanation of symbols]

 10 ... Container body 11 ... Terminal 12 ... Flange 13 ... Conductor 16 ... Flange mounting body 17 ... O-ring 19 ... Groove portion 21, 22 ... Electrode 23, 24 ... Lead wire 26, 27 ... Measurement terminal 45 ... Capacitance meter

Front Page Continuation (72) Inventor Takashi Sakugawa 2-17 Osaki, Shinagawa-ku, Tokyo Stock Company Shameidensha

Claims (2)

[Claims] 1. A container main body in which an insulating medium is enclosed, an insulating flange having an electric conductor provided on an outer wall of the container main body and connected to a device in the container main body, and fixed to the container main body, A flange mounting body for mounting the flange, an insulating medium leakage preventing member provided on the flange mounting body for preventing leakage of the insulating medium in the container body, and formed on the flange due to deterioration of the insulating medium leakage preventing member. A groove that receives the insulating medium that leaks out of the container body, an electrode that faces the groove, and a static capacitance that is connected to this electrode and that measures the capacitance between the electrodes according to the amount of the insulating medium that enters the groove. It is equipped with a capacitance measuring device and a detection device for detecting the leakage of the insulating medium when the capacitance measured by the capacitance measuring device exceeds a preset value. Leakage detection device for enclosed media. 2. The enclosed medium leakage detection device according to claim 1, wherein the groove portion is formed inside a position where the flange is fixed to the flange mounting body and outside the position in the insulating medium leakage prevention member. .