JP2012160670A - Deterioration diagnosis device of oil-immersed transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deterioration diagnosis device of an oil-immersed transformer which can be easily installed on an existing facility and can efficiently and accurately predict the life of the oil-immersed transformer at a low cost, without interrupting operation of the oil-immersed transformer.SOLUTION: In a deterioration diagnosis device 1 of an oil-immersed transformer, a test piece 14 is stored in a mesh-like metal case 3 under such condition as a tensile load is applied in the direction represented by an arrow X (axial direction) by tensile means 2. The tensile means 2 includes a support bracket 4 formed from an insulating member which is U-like in side view, a tubular body 5 containing a guide hole 5a, an electrode 7 which is inserted in the guide hole 5a and is held slidably in the direction represented by the arrow X by the tubular body 5, a fitting bracket 9 by which the electrode 7 is installed upright, and a tensile spring 10. Inside a cap 6 that is fitted to a front plate 4b of the support bracket 4 so as to cover a tip part 7a of the electrode 7, an electrode 8 is so set as to abut with the tip part 7a in a case where the electrode 7 shifts following the fracture of the test piece 14.

Description

  The present invention relates to an apparatus for diagnosing the deterioration state of an oil-filled transformer based on the deterioration state of insulating paper, and in particular, predicting the life of the oil-filled transformer in advance by monitoring the tensile strength of the insulating paper. The present invention relates to a deterioration diagnosis device for an oil-filled transformer that can be used.

  An oil-filled transformer has an insulation performance and a cooling performance superior to a dry transformer because an iron core and a winding are housed in a tank filled with insulating oil. In addition, it is used in many fields because of its low noise. The life of an oil-filled transformer varies depending on the environment in which it is installed, operating conditions, etc., but it is generally said that it is determined by the degree of deterioration of the insulating paper wound around the winding. Therefore, in order to use the oil-filled transformer safely over a long period of time, it is necessary to grasp the degree of deterioration of the insulating paper.

Here, the structure of the oil-filled transformer will be briefly described with reference to FIG.
FIG. 3 is a longitudinal sectional view schematically showing the structure of a conventional oil-filled transformer.
As shown in FIG. 3, the main body 51 of the oil-filled transformer 50 is housed in a tank 52 formed by welding an iron plate or the like. The tank 52 includes a side plate 52a to which a corrugated portion 53 having an oil passage inside is attached, a bottom plate 52b welded to the lower end of the side plate 52a, and a top plate 52c installed at the upper end of the side plate 52a. The main body 51 includes an iron core 54 with upper and lower fastening metal fittings 54 a and 54 b and a winding 55 wound around the iron core 54. The fastening metal fitting 54 a is connected to a top plate 52 c via a bolt 56. It is connected to. The tank 52 in which the main body 51 is installed is filled with insulating oil.

  Insulating oil and insulating paper used for oil-filled transformers are likely to deteriorate with long-term use. Of these, the insulating oil can be easily replaced with a new oil. However, in order to replace the insulating paper, the operation of the oil-filled transformer must be stopped, which requires a lot of cost and time. In particular, since it is impossible to replace only the insulating paper wound around the winding 55, if the insulating paper wound around the winding 55 deteriorates and cannot be used, the oil-filled transformer itself cannot be used. .

  When the tensile strength of the insulating paper decreases due to aging deterioration or the like and reaches about 60% of the initial state, the insulating paper is easily damaged by the electromagnetic mechanical force generated in the winding 55 due to a short circuit accident on the load side. . Therefore, the point in time when the tensile strength reaches this value can be considered as an indication of the life of the insulating paper. That is, by monitoring the tensile strength of the insulating paper, it is possible to diagnose the deterioration state of the oil-filled transformer. However, it is not easy to measure the tensile strength of insulating paper that has been used for many years in the state of being wound around the winding 55 and has reached the end of its life. Therefore, conventionally, “average polymerization degree” is used as a deterioration index of insulating paper instead of tensile strength. The “average polymerization degree” is an average value of the number of connections for cellulose molecules constituting the insulating paper. When the insulating paper is deteriorated, the cellulose molecules are cut and shortened, so that the average degree of polymerization becomes small. At the same time, the tensile strength decreases. For example, the average polymerization degree of the insulating paper is about 800 to 1200 in the initial state, but when the tensile strength of the insulating paper is reduced to about 60%, the average polymerization degree is also reduced to about 400 to 450.

  By measuring the average polymerization degree of insulating paper in this way, it is possible to indirectly diagnose the progress of deterioration of the insulating paper. However, in order to measure the average degree of polymerization, it is necessary to stop the operation of the oil-filled transformer and to take a part of the sample from the insulating paper wound around the winding 55. That is, the method of measuring the average degree of polymerization of insulating paper cannot efficiently and efficiently diagnose the deterioration state of the oil-filled transformer. In recent years, in order to solve such problems, various inventions have been made with regard to an oil-filled transformer deterioration diagnosis device. In connection with this, several inventions and devices have already been disclosed.

For example, Patent Literature 1 relates to a “life diagnosis device for oil-filled transformer” that can diagnose a deterioration state of the oil-filled transformer with high accuracy under the name “life diagnosis device and oil-filled transformer”. The invention is disclosed.
In the life diagnosis apparatus which is an invention disclosed in Patent Document 1, an insulating storage box is attached to an oil-filled transformer, and a conductor wire covered with insulating paper and a current transformer are provided inside the insulating storage box. It has a structure installed in a state immersed in insulating oil.
According to such a structure, a current corresponding to the current flowing through the winding of the oil-filled transformer is generated in the current transformer, and the conductive wire stored in the insulator storage box generates heat due to this current. . As a result, the temperature of the insulation paper in the insulator storage box becomes about the same as the temperature of the insulation paper of the oil-filled transformer, and the deterioration condition of the insulation paper in the insulator storage box is the deterioration of the insulation paper of the oil-filled transformer. Approach the state. Thereby, the diagnostic accuracy of the lifetime of an oil-filled transformer increases.

Patent Document 2 discloses an invention relating to an “oil-immersed transformer deterioration diagnosis device” capable of performing highly reliable deterioration diagnosis.
The invention disclosed in Patent Document 2 is a diagnostic piece made of a cigarette-insulated electric wire in a state where the storage chamber is provided in the upper part of the tank of the oil-filled transformer and is immersed in insulating oil inside the storage chamber; A pressurizing means for pressurizing the diagnostic piece and an auxiliary heating means are provided.
According to such a structure, since the diagnostic piece deteriorated in a state close to the actual use environment is formed, the reliability of the degradation diagnosis of the oil-filled transformer can be enhanced.

The invention disclosed in Patent Document 3 discloses an invention relating to a “transformer material deterioration test apparatus” capable of performing a deterioration test using a material placed in an environment similar to an actual use state of a transformer. .
The device disclosed in Patent Document 3 is characterized in that the material to be subjected to the deterioration test is put in the inside of the data box installed at the upper part of the transformer tank, and the insulating oil in the transformer tank is circulated. To do.
In this type of deterioration test equipment, the material in the data box is affected by the gas generated by the temperature change of the insulating oil and the effect of charging / partial discharge of the insulating oil. Rather than the insulating paper actually used in the transformer. And the reliability of a deterioration test can be improved by using this material.

JP 2010-114268 A JP 2003-289008 A Japanese Utility Model Publication No. 5-75652

  In the invention disclosed in Patent Document 1 which is the above-described prior art, it is necessary to take out the insulator from the insulator storage box in order to investigate the deterioration state of the insulator. Therefore, there is a problem that the life diagnosis of the oil-filled transformer cannot be performed in a short time at a low cost. In addition, when the temperature of the insulating oil in the insulator storage box changes, the deterioration speed of the insulating paper changes, but the relationship between the deterioration speed of the insulating paper and the temperature of the insulating oil is unknown, so the temperature of the insulating oil is changed. In this method, it is difficult to adjust the deterioration rate of the insulating paper. That is, the invention disclosed in this document has a problem that the deterioration rate of the insulating paper cannot be easily adjusted. In addition, there is a problem that it cannot be easily installed in existing equipment.

  Further, in the invention disclosed in Patent Document 2, the method of heating the insulating oil by the auxiliary heating means is different from the situation in which the insulating oil is heated in the actual use state. There is a possibility that a large difference may occur between the deteriorated state of the insulating paper covering the film. As a result, the diagnostic accuracy for the life of the oil-filled transformer may not improve as much as expected. Further, in order to examine the deterioration state of the diagnostic piece, it is necessary to stop the operation of the oil-filled transformer and take out the diagnostic piece from the storage chamber. Therefore, the life diagnosis of the oil-filled transformer cannot be performed efficiently in a short time.

  Furthermore, in the device disclosed in Patent Document 3, there is a problem that the deterioration rate of the material to be subjected to the deterioration test cannot be adjusted. Moreover, since a material must be taken out of a data box in order to perform a deterioration test, there is a problem that the deterioration test cannot be easily and efficiently performed.

  The present invention has been made in response to such a conventional situation, and can be easily installed in existing equipment, and can be efficiently installed at low cost without stopping the operation of the oil-filled transformer. An object of the present invention is to provide an oil-filled transformer deterioration diagnosis device that can predict the life of an oil-filled transformer.

To achieve the above object, the deterioration diagnosis apparatus for an oil-filled transformer according to claim 1 is a tape-like test made of a paper material of the same type as the insulating paper wound around the winding of the oil-filled transformer. And a tensile means for holding the test piece in a state in which a tensile load is applied in a uniaxial direction, and a break detecting means for detecting that the test piece is broken and generating an electric signal. The provided tensioning means is installed at the upper part in the tank in which the oil-filled transformer is accommodated.
In the deterioration diagnosis device for oil-filled transformers with such a structure, the test piece is placed in the upper part of the tank where the winding becomes hot, so that the temperature change is the same as that of the insulating paper wound around the winding. In response, the test piece has the effect of aging. In addition, the tensile strength of the test piece is lowered and finally falls below the tensile load, and the fracture detecting means detects that the test piece is broken.

According to a second aspect of the present invention, in the deterioration diagnosis apparatus for an oil-filled transformer according to the first aspect, the tension means includes an electrode holder to which one end of the test piece is fixed, and a uniaxial direction by the electrode holder. A first electrode that is slidably held to the first electrode, a fixture that is attached to the first electrode and that fixes the other end of the test piece, and biases the fixture in the tensile direction of the test piece The break detecting means includes a second electrode that is installed on the holder so as to come into contact with the first electrode when the fixture moves in the tensile direction of the test piece. Wiring for passing an electrical signal is connected to each of the electrode and the second electrode, and at least one of the electrode holder and the first electrode or between the electrode holder and the second electrode is It is characterized by being insulated.
In the deterioration diagnosis device for an oil-filled transformer having such a structure, in addition to the operation of the invention according to claim 1, when the test piece is broken, the fixture is urged by the elastic member to pull the test piece in the pulling direction. And the first electrode comes into contact with the second electrode. And when the 1st electrode and the 2nd electrode contact, it has the effect | action that the electrical signal which shows that the test piece fractured | flowed flows into wiring.

The invention according to claim 3 is an alarm means for emitting light or sound to the outside of the tank in response to an electrical signal, connected to the wiring of the break detecting means in the deterioration diagnosis device for an oil-filled transformer according to claim 2 It is characterized by comprising.
In the deterioration diagnosis device for an oil-filled transformer having such a structure, in addition to the operation of the invention according to the second aspect, the alarm means notifies that the test piece has been broken.

Invention of Claim 4 is equipped with the mesh-shaped electroconductive case earth | grounded via an earth wire in the deterioration diagnostic apparatus of the oil-filled transformer of any one of Claim 1 thru | or Claim 3, The pulling means is installed in the tank while being accommodated in the conductive case.
In the deterioration diagnosis device for an oil-filled transformer having such a structure, in addition to the operation of the invention according to claims 1 to 3, when an arc (spark) occurs due to a failure of the transformer, etc. The conductive case has the effect of preventing arc propagation to the tensioning means.

According to a fifth aspect of the present invention, in the deterioration diagnostic apparatus for an oil-filled transformer according to any one of the first to fourth aspects, the tensile load is set to 60% of the tensile strength in the initial state of the insulating paper. It is characterized by that.
In insulating paper used for oil-filled transformers, it is generally considered that the point in time when the tensile strength is reduced to about 60% of the initial state is the life expectancy. Since the same kind of paper as the insulating paper is used for the test piece, the deterioration diagnosis device for the oil-filled transformer having the above structure has the function of the invention according to any one of claims 1 to 4. When the test piece reaches the end of its life, it has the effect of breaking.

  According to the deterioration diagnosis apparatus for an oil-filled transformer according to claim 1 of the present invention, the test piece made of the same kind of paper as the insulating paper wound around the winding is subjected to temperature conditions in accordance with the actual use state. Therefore, the life of the insulating paper can be predicted by diagnosing the deterioration state of the test piece. Moreover, the deterioration rate of a test piece can be adjusted by changing the setting of the tensile load. For example, if the value of the tensile load is set to be large and the test piece is quickly broken, the life can be predicted before the oil-filled transformer breaks down.

  According to the degradation diagnosis device for an oil-filled transformer according to claim 2 of the present invention, in addition to the effect of the invention according to claim 1, the effect that it is possible to detect that the test piece is broken with a simple structure. Play. Moreover, it can be easily installed in existing facilities.

  According to the deterioration diagnosis device for an oil-filled transformer according to claim 3 of the present invention, in addition to the effect of the invention according to claim 2, the state of the breakage is measured in a state where the test piece is installed in the tank. It has the effect of being able to know. Thereby, it is possible to predict the life of the insulating paper wound around the winding without stopping the operation of the oil-filled transformer. In this case, there is no work or expense associated with the shutdown of the oil-filled transformer. That is, according to the present invention, the deterioration state of the oil-filled transformer can be diagnosed at a low cost in a short time.

  According to the deterioration diagnosis device for an oil-filled transformer according to claim 4 of the present invention, in addition to the effects of the inventions according to claims 1 to 3, there is an effect that the tension means is unlikely to fail.

  In the deterioration diagnosis apparatus for an oil-filled transformer according to claim 5 of the present invention, the point in time when the tensile strength of the test piece falls below 60% of the initial state is used as a measure of the life of the test piece. The deterioration state can be diagnosed with high accuracy. That is, according to the present invention, in addition to the effects of the inventions according to claims 1 to 4, there is an effect that the life of the oil-filled transformer can be diagnosed with high accuracy.

(A) is a side view of the Example of the deterioration diagnosis apparatus of the oil-filled transformer which concerns on embodiment of this invention, (b) and (c) are the deterioration diagnosis apparatuses of the oil-filled transformer of a present Example, respectively. It is the front view and top view of the tension | pulling means which comprise. (A) is a longitudinal cross-sectional view which shows the outline of the structure of the oil-filled transformer in which the degradation diagnosis apparatus of the oil-filled transformer of a present Example was installed, (b) is deterioration of the oil-filled transformer of a present Example. It is a block diagram which shows the structure of a diagnostic apparatus. It is the longitudinal cross-sectional view which showed the outline of the structure of the conventional oil-filled transformer.

  The degradation diagnosis apparatus for oil-filled transformers according to the present invention is a test piece obtained by processing a paper material of the same type as the insulating paper wound around the winding of the oil-filled transformer into a tape shape, and determining the tensile strength of the test piece. By monitoring, the life of the oil-filled transformer is predicted before it fails. Hereinafter, an embodiment of a deterioration diagnosis apparatus for an oil-filled transformer according to the present invention will be described in detail with reference to FIGS.

  Fig.1 (a) is a side view of the Example of the deterioration diagnosis apparatus 1 of the oil-filled transformer which concerns on embodiment of this invention, FIG.1 (b) and FIG.1 (c) are the oil of a present Example, respectively. It is the front view and top view of the tension | pulling means 2 which comprise the deterioration diagnosis apparatus 1 of an incoming transformer. FIG. 2 (a) is a longitudinal sectional view showing an outline of the structure of the oil-filled transformer in which the oil-filled transformer deterioration diagnosis device 1 of this embodiment is installed, and FIG. 2 (b) is the present embodiment. It is a block diagram which shows the structure of the deterioration diagnosis apparatus 1 of an oil-filled transformer. In addition, illustration of the lamp | ramp 15 and the speaker 16 is abbreviate | omitted in Fig.1 (a). Further, in FIG. 1 (a), only one pulling means 2 is shown, but actually, as shown in FIG. 2 (b), there are a plurality of breakage detecting means 20 described later, and this corresponds to this. A plurality of pulling means are housed inside the case 3. Further, the components shown in FIG. 3 are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIGS. 1 (a) to 1 (c), in the degradation diagnostic apparatus 1 for an oil-filled transformer, a tensile load is applied to the test piece 14 in the direction (axial direction) indicated by the arrow X by the tension means 2. In this state, it is housed in the metal case 3. Note that the metal case 3 has a net shape, and the insulating oil is freely accessible. Further, the pulling means 2 is inserted into the support member 4 made of an insulating member, the cylindrical body 5 having the guide hole 5a, and the guide hole 5a, and is slidable in the direction indicated by the arrow X by the cylindrical body 5. The electrode 7 is held, a fixture 9 on which the electrode 7 is erected, and a tension spring 10. That is, the support 4 and the cylindrical body 5 constitute an electrode holder that holds the electrode 7 slidably in the tensile direction of the test piece 14.

  The support 4 has a front plate 4b and a rear plate 4c erected at both ends of the base 4a to form a "U" shape in side view, and a cylindrical body 5 is erected on the inner surface of the front plate 4b. ing. Further, the guide hole 5 a of the cylindrical body 5 communicates with a through hole 4 d provided in the front plate 4 b, and the tip portion 7 a of the electrode 7 protrudes from the through hole 4 d to the outside of the support 4. Further, a cap 6 is attached to the front plate 4b so as to cover the tip 7a of the electrode 7. An electrode 8 is disposed inside the cap 6 so that the electrode 7 can come into contact with the tip 7a when the electrode 7 moves.

  The tension spring 10 interposed between the fixture 9 and the front plate 4b urges the fixture 9 in a direction (indicated by an arrow X) to approach the front plate 4b. It is being fixed to the board 4c and the fixture 9, respectively. Further, the inside of the cap 6 is filled with air so that the insulating oil does not flow into the cap 6 through the gap between the guide hole 5a and the electrode 7 in a state where the tension means 2 is immersed in the insulating oil. O-rings 11 a and 11 b are installed in the hole 5 a so as to close the gap with the electrode 7. Further, the metal case 3 is grounded via a ground wire 12, and wirings 13 a and 13 b are connected to the electrodes 7 and 8.

  As described above, in this embodiment, the tensile load of the tension spring 10 is set at the time when the tensile strength of the insulating paper is reduced to 60% of the initial state. That is, for a paper material of the same type as the insulating paper that is actually wound around the winding of the oil-filled transformer, after measuring the tensile strength in the initial state with 100 samples, 60% of the average value is obtained. Is the tensile load of the tension spring 10. Therefore, when the tensile strength of the test piece 14 decreases and finally falls below the tensile load of the tension spring 10, the test piece 14 is pulled by the tension spring 10 and breaks. At this time, the electrode 7 moves in the tensile direction of the test piece 14, and the tip 7 a of the electrode 7 comes into contact with the electrode 8.

As shown in FIG. 2 (a), the tension means 2 to which the test piece 14 is attached is placed in the upper part of the tank 52 in a state where it is accommodated in the metal case 3, and at a place where there is no problem in insulation. Has been. Further, as shown in FIG. 2B, the lamp 15 and the speaker 16 are connected to the wirings 13a and 13b connected to the electrodes 7 and 8 and extending to the outside of the tank 50, as shown in FIG. The controller 17 is connected to a power source (not shown) for supplying power for driving the lamp 15 and the speaker 16.
That is, the electrodes 7 and 8 and the wirings 13a and 13b constitute a break detection means 20 that detects that the test piece 14 is broken and generates an electrical signal (break signal 18 described later). The electrode 7 slidably held by the cylindrical body 5 has a function as a guide for defining the moving direction of the fixture 9 when the test piece 14 is broken. It is also an element. However, the electrode 7 does not necessarily have such a configuration. For example, a guide member that is held by the cylindrical body 5 and defines the moving direction of the fixture 9 can be provided separately from the electrode 7.

  In the degradation diagnosis apparatus 1 for an oil-filled transformer according to the present embodiment, as shown in FIG. 2 (b), ten tension means 2 are accommodated in the case 3, and when the test piece 14 breaks, a break detection means. A break signal 18 is sent from 20 to the control unit 17. Further, the control unit 17 sends command signals 19a and 19b to the lamp 15 and the speaker 16 only when the break signal 18 is received from more than half of the ten break detection means 20, respectively. The lamp 15 and the speaker 16 are configured to emit light and sound according to the command signals 19a and 19b, respectively.

  In the oil-filled transformer deterioration diagnosis device 1 having such a structure, the test piece 14 is disposed on the upper portion of the tank 52 where the winding 55 becomes high temperature. It has the effect of undergoing aged deterioration in response to a temperature change equivalent to the insulation paper that is actually wound. Further, when the break detecting means 20 detects that the test piece 14 is broken, the alarm means including the lamp 15 and the speaker 16 has an effect of emitting light or sound. Further, when an arc (spark) is generated due to a failure of a transformer or the like, the metal case 3 has an effect that the propagation of the arc to the tension means 2 is prevented. In addition, the cap 6 has an effect of preventing the inflow of the insulating oil to the contact portion so that the conductive state of the contact portion of the electrodes 7 and 8 is not deteriorated by the deteriorated insulating oil. In this embodiment, the inside of the cap 6 is filled with air. However, the present invention is not limited to such a structure. For example, the inside of the cap 6 is made of a gas other than air or an insulating oil that has not deteriorated. It may be satisfied.

  As described above, according to the deterioration diagnosis apparatus 1 for an oil-filled transformer of the present embodiment, the test piece 14 is made of the same kind of paper as the insulating paper wound around the winding 55, and moreover, Since it deteriorates with time under the temperature condition according to the use state, it is possible to predict the life of the insulating paper by diagnosing the deterioration state of the test piece 14. In addition, the deterioration rate of the test piece 14 can be easily adjusted by selecting the tension spring 10 having a predetermined spring constant and changing the magnitude of the tensile load acting on the test piece 14. For example, if the tensile load is set to a slightly large value, the test piece breaks quickly, so that the life can be predicted before the oil-filled transformer breaks down.

  Moreover, since the deterioration diagnosis apparatus 1 of the oil-filled transformer according to the present embodiment has a simple structure, it can be easily installed in existing facilities. Furthermore, since the tension | pulling means 2 cannot be easily damaged by the shielding effect of the metal case 3, it can be used safely over a long period of time. In addition, since the life of the test piece 14 is set to the time when the tensile strength falls below 60% of the initial state, the deterioration state of the test piece 14 can be diagnosed with high accuracy. Thereby, the diagnostic accuracy of the lifetime of an oil-filled transformer improves. And even if it does not take out the test piece 14 from the tank 52, the breaking condition can be known. That is, even when the oil-filled transformer is in operation, it is possible to predict the life of the insulating paper wound around the winding 55. In this case, there is no work or cost associated with the shutdown of the oil-filled transformer. Therefore, it is possible to efficiently diagnose the deterioration state of the oil-filled transformer at a low cost in a short time.

  The deterioration diagnosis apparatus for oil-filled transformers of the present invention is not limited to the one shown in this embodiment. For example, instead of the metal case 3, a case made of a material other than conductive metal may be used. Furthermore, the tension spring 10 does not have to have a coil shape as shown in FIGS. 1 (a) and 1 (c). And if it is an elastic member which can apply a tensile load to the test piece 14 in a uniaxial direction, it does not necessarily need to be a spring. In addition, since at least one of the electrode holder and the electrode 7 or between the electrode holder and the electrode 8 only needs to be insulated, instead of using the support 4 as an insulating member, a cylindrical body 5 and the cap 6 can also be used as insulating members. Alternatively, the support 4 may be an insulating member, the cap 6 and the fixture 9 may be conductive members, and the wirings 13 a and 13 b may be connected to the fixture 9 and the cap 6 instead of the electrodes 7 and 8. . Furthermore, the installation of the metal case 3 is not limited to the position shown in FIG. 2A and can be changed as long as it is an upper portion of the tank 52 and there is no obstacle in insulation. Moreover, the tension | tensile_strength means 2 accommodated in the metal case 3 is not limited to ten pieces, It can change suitably.

  The inventions described in claims 1 to 5 of the present invention are not limited to the insulating paper wound around the winding of the oil-filled transformer, but deteriorate the insulating paper used in a state immersed in the insulating oil. Applicable when diagnosing a condition.

  DESCRIPTION OF SYMBOLS 1 ... Degradation diagnostic apparatus of oil-filled transformer 2 ... Tensioning means 3 ... Metal case 4 ... Supporting tool 4a ... Base 4b ... Front plate 4c ... Rear plate 4d ... Through-hole 5 ... Cylindrical body 5a ... Guide hole 6 ... Cap 7, 8 ... Electrode 7a ... Tip 9 ... Fixture 10 ... Tension spring 11a, 11b ... O-ring 12 ... Ground wire 13a, 13b ... Wiring 14 ... Test piece 15 ... Lamp 16 ... Speaker 17 ... Control part 18 ... Break signal 19a, 19b ... Command signal 20 ... Break detection means 50 ... Oil-filled transformer 51 ... Main body 52 ... Tank 52a ... Side plate 52b ... Bottom plate 52c ... Top plate 53 ... Corrugated part 54 ... Iron core 54a, 54b ... Fastening fitting 55 ... Winding 56 ... Bolt

Claims (5)

A tape-shaped test piece made of the same type of paper as the insulating paper wound around the winding of the oil-filled transformer,
A tensile means for holding the test piece with a tensile load applied in a uniaxial direction;
A break detecting means for detecting that the test piece is broken and emitting an electrical signal;
With
The apparatus for diagnosing deterioration of an oil-filled transformer, wherein the tension means to which the test piece is attached is installed in an upper part of a tank in which the oil-filled transformer is accommodated. The tension means is
An electrode holder to which one end of the test piece is fixed;
A first electrode slidably held in the uniaxial direction by the electrode holder;
A fixture that is attached to the first electrode and to which the other end of the test piece is fixed;
An elastic member for urging the fixture in the tensile direction of the test piece;
Consists of
The break detecting means is
When the fixture is moved in the tensile direction of the test piece, the second electrode is provided on the holder so as to be in contact with the first electrode,
The first electrode and the second electrode are connected to wiring for flowing the electric signal, respectively.
2. The oil-filled transformer according to claim 1, wherein at least one of the electrode holder and the first electrode or between the electrode holder and the second electrode is insulated. Equipment deterioration diagnosis device.   The deterioration diagnosis apparatus for an oil-filled transformer according to claim 2, further comprising alarm means connected to the wiring of the breakage detection means and emitting light or sound to the outside of the tank in response to the electrical signal. . It has a net-like conductive case that is grounded via an earth wire,
The deterioration diagnosis apparatus for an oil-filled transformer according to any one of claims 1 to 3, wherein the pulling means is installed in the tank in a state of being housed in the conductive case. The deterioration diagnosis apparatus for an oil-filled transformer according to any one of claims 1 to 4, wherein the tensile load is set to 60% of a tensile strength in an initial state of the insulating paper.

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