JP2000002734A - Static measuring device for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a static measuring device for liquid capable of equivalent measuring for the deterioration of a liquid-containing electric apparatus. SOLUTION: In such a static measuring device that a static evaluation of a liquid-containing electric apparatus, equipped with a static-electricity generating part for generating static electricity in a fluid and in which fluidized insulating liquid is enclosed in a vessel, is obtained by using a filter 4, comprising the same material as a solid insulator used in the liquid-containing electric apparatus, as a static-electricity generating part, the surface part of the filter 4 of the static-electricity generating part is formed so as to have equality with the deterioration state of the surface part of the solid insulator of the liquid- containing electric apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow electrification measuring device for evaluating a flow electrification in accordance with the state of deterioration of a liquid-immersion electric device.

[0002]

2. Description of the Related Art Conventionally, when an insulating liquid flows in a liquid-filled electrical device such as an electrical device containing an insulating oil or a device containing perfluorocarbon, the insulating liquid is used inside the electrical device. Static electricity is generated between the solid insulator and a charged phenomenon. This is called a flow electrification phenomenon.

[0003] The flow electrification phenomenon changes depending on the properties of the insulating liquid and the solid insulator, the flow rate of the insulating liquid, and the like. Various devices have been studied as a flow charging measurement device for measuring such a flow charging phenomenon. In these flow electrification measuring devices, the same material as the insulator used for the liquid-immersed electric device is separately prepared, and this insulator is used for the static electricity generating portion, and the amount of generated static electricity of the insulating liquid flowing therethrough ( (The degree of charge).

As another method, there is a method of measuring a leakage current of a winding of a liquid-immersion electric device and grasping a state of flowing electrification in the liquid-immersion electric device. Then, it is determined from the winding leakage current whether or not the liquid-immersion electric device is in a dangerous state due to the flow electrification. However, the measurement of the winding leakage current needs to be performed separately from the system of the liquid-immersion electric equipment, and the operation of the liquid-immersion electric equipment needs to be stopped. Therefore, it is difficult to always determine the situation.

[0005]

As described above, the conventional flowing charge measuring apparatus uses a material separately prepared as the static electricity generating unit. Therefore, in each case, a new insulator was used as a material. In general, in a liquid-filled electrical device, both the insulating liquid and the solid insulating material used therein are deteriorated by heat, oxygen, or the like, depending on the operating years. For example, an insulating liquid such as insulating oil is oxidatively degraded by a trace amount of oxygen in a liquid-immersed electric device, and the dielectric loss tangent and the total acid value increase. Further, the characteristics of the insulating liquid such as perfluorocarbon change depending on the eluted material of the surrounding material. Such a change on the insulating liquid side is
The evaluation can be performed by using a new insulator for the flow electrification measuring device.

[0006] The leakage current of the windings of the liquid-immersion electric device has a certain correlation with the degree of charge of the insulating liquid, and it should be possible to grasp the state of the flow charging of the liquid-immersion electric device. However, with regard to solid insulators in liquid-immersed electrical equipment, trace amounts of oxygen can cause the surface to oxidize and deteriorate, thermally reduce the degree of polymerization, and adsorb components in the liquid over time, resulting in insulation liquid. The aspect of the surface portion of the solid insulator that comes into contact changes.

Therefore, when a new insulator is used in the static electricity generating section of the flow electrification measuring device, the surface portion of the fixed insulator in the liquid-filled electric device and the surface portion of the insulator of the flow electrification measuring device are different, and are equivalent. However, in the conventional measurement of the degree of charge of the insulating liquid, there is a problem that the state in the liquid-filled electric device cannot be accurately grasped.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a flow electrification measuring apparatus capable of performing a measurement equivalent to the state of deterioration of a liquid-immersion electric device. I do.

[0009]

Means for Solving the Problems Claim 1 according to the present invention.
The static charge measuring device of the present invention is provided with a static electricity generating section for generating static electricity in a fluid, and evaluates the static charge of a liquid-filled electrical device in which a flowing insulating liquid is sealed in a container by using a solid-state device used in the liquid-filled electrical device. In a flow electrification measuring device, which is obtained by using an insulator made of the same material as the insulator for the static electricity generating unit, the surface of the insulator of the static electricity generating unit is replaced with the surface of the solid insulator of the liquid-immersed electric device. It is formed so as to be equivalent to the state of deterioration of the portion.

According to a second aspect of the present invention, there is provided a flow electrification measuring apparatus according to the first aspect, wherein the degree of polymerization of the insulator used in the static electricity generating portion is determined by the solid insulation used in the liquid-immersion electric equipment. It is formed so as to have the same degree of polymerization of the product.

According to a third aspect of the present invention, in the second aspect, when the insulating oil is used as the insulating liquid of the liquid-immersed electric device, the degree of polymerization of the insulator in the static electricity generating portion is determined by: This is the degree of polymerization of the solid insulator of the liquid-immersion electric device, which is determined from the amount of furfural present in the liquid-immersion electric device.

According to a fourth aspect of the present invention, there is provided a flow electrification measuring apparatus according to the first aspect, wherein the concentration of the attached matter on the surface of the insulator used in the static electricity generating section is used for a liquid-immersed electric device. It is formed so as to have the same concentration as the attached matter on the surface of the solid insulator.

According to a fifth aspect of the present invention, there is provided a flow charging measuring apparatus according to the fourth aspect, wherein insulating oil is used as an insulating liquid of the liquid-immersed electric device, and 1,2,2,3, In the case where 3-benzotriazole is used, 1,2,3-
It is formed so that the concentration of benzotriazole is the same as the concentration of 1,2,3-benzotriazole attached to the surface of the fixed insulator of the liquid-immersion electric device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described. FIG. 1 is a diagram showing a configuration of a flowing charge measuring apparatus according to Embodiment 1 of the present invention. In the figure, 1 is an upper container, 2 is an insulating liquid injected into the upper container 1, 3 is a cock formed in a lower portion of the upper container 1, 4 is an insulating liquid 2 from the upper container 1 via a cock 3.
Is a filter through which the insulating liquid 2 is introduced and passes, and generates static electricity when the insulating liquid 2 passes.
The surface portion of the filter 4 is formed so as to be equivalent to the state of deterioration of the surface portion of the solid insulator used in the liquid-immersion electric device.

Reference numeral 5 denotes a holder for holding the filter 4, and reference numeral 6 denotes a detection unit for detecting the amount of static electricity generated in the filter 4 when the insulating liquid 2 passes through the filter 4, and includes, for example, an ammeter. Have been. Reference numeral 7 denotes a lower container for receiving the insulating liquid 2 passed through the filter 4.

The surface portion of the filter 4, which is the insulator of the static electricity generating portion of the fluidized charge measuring device of the first embodiment configured as described above, is replaced with a solid insulator (hereinafter referred to as a solid insulator) used in the liquid-filled electric equipment. , And a solid insulator) will be described below with respect to how the surface portion is degraded and how to provide equivalence. Here, as an example of the liquid-filled electrical device, an insulating oil-filled electrical device will be described. First, the filter 4 is prepared from the same material as the solid insulator used in the insulating oil-filled electric device.

As an example, the material of the fixed insulator is coil insulating paper (cellulose kraft paper having a thickness of about 80 μm).
And a press board (a board formed by compressing cellulose having a thickness of about 0.8 to 3.2 mm). Therefore, the filter 4 is formed of such a material. In order to make the surface portion of the filter 4 equivalent to the deterioration state of the surface portion of the solid insulator, it is conceivable to make the degree of polymerization of the solid insulator and the degree of polymerization of the filter 4 uniform.

In this case, a part of the solid insulator is actually taken out of the electric equipment containing the insulating oil, and the degree of polymerization of the solid insulator is measured. Then, a method is conceivable in which a new filter 4 is placed in insulating oil, heated, the filter 4 is deteriorated, and the degree of polymerization of the filter 4 is made equal to the degree of polymerization previously measured.

As another method of measuring the degree of polymerization of the solid insulator, there is a method of calculating the degree of polymerization of the solid insulator from the amount of furfural present in the insulating oil-filled electric equipment. This furfural is a substance generated by deterioration of the solid insulator in the insulating oil, and the degree of polymerization of the solid insulator can be determined according to this value.

Thus, it can be seen that there is a correlation between the amount of furfural and the degree of polymerization of the solid insulator. The data on the correlation between the amount of furfural and the degree of polymerization can be referred to, for example, the data disclosed in JP-A-4-241407 shown in FIG. in this way,
A new filter 4 is heated by the above-described method so that the degree of polymerization of the solid insulator becomes the same as the degree of polymerization of the solid insulator calculated from the amount of furfural, and the filter 4 is formed so that the degree of polymerization of the filter 4 becomes the same as the calculated value. Can be.

The surface area of the filter 4 is made equivalent to the state of deterioration of the surface area of the solid insulator. It is conceivable to make the concentration of the deposit attached to the surface uniform. In this case, the solid insulator is actually taken out of the electrical equipment containing the insulating oil, and the concentration of the attached substance on the surface of the solid insulator is measured. And
A method may be considered in which the attached matter is attached to a new filter 4 to the same concentration, and the concentration of the attached matter on the surface of the filter 4 and the concentration of the attached matter on the surface of the solid insulator are made uniform.

Further, as a deposit adhering to the surface of the solid insulator, 1,2,3-benzotriazole, which is used as a flow electrification inhibitor of an insulating oil-filled electric device, can be considered. Therefore, as a method for equalizing the concentration of 1,2,3-benzotriazole, first, the concentration of 1,2,3-benzotriazole present in the insulating oil in the electric equipment containing the insulating oil is measured. deep. Then, when the battery is deteriorated, the insulating oil contained in the insulating oil in the insulating oil-filled electric device has 1,2,2
Measure the concentration of 3-benzotriazole.

Then, by dividing the difference by the surface area of the solid insulator used in the insulating oil-filled electric equipment,
The concentration of 1,2,3-benzotriazole attached to the surface of the solid insulator is calculated. Then, 1,2,3-benzotriazole of the same concentration is attached to the surface of the filter 4.

As a method of adhesion, 1,2,3-benzotriazole is added to the insulating oil so as to have a concentration higher than the concentration of 1,2,3-benzotriazole present in the electric equipment containing the insulating oil. The filter 4 is placed in the insulating oil, and 1,2,3-benzotriazole can be attached to the surface of the filter 4. At this time, filter 4
The concentration of 1,2,3-benzotriazole adhering to the substrate can be confirmed by the same method as the above-described method for measuring an insulating oil-filled electric device.

Here, 1,2,3-benzotriazole has been described as an example of the attached matter, but the present invention is not limited to this, and other substances can be used as long as they adhere to the solid insulator over time. Well, it can be calculated by the same method as that for 1,2,3-benzotriazole and attached in the same manner.

In this way, the filter 4 having the equivalent of the state of deterioration of the surface of the solid insulator is installed, the cock 3 is opened, and the insulating liquid 2 is dropped from the upper container 1,
Pass through filter 4. Then, by detecting the amount of static electricity generated at that time by the detection unit 6, the flow electrification evaluation of the insulating oil-filled electric device is performed.

According to the first embodiment formed as described above, the amount of generated static electricity is detected by using the filter 4 equivalent to the state of deterioration of the surface portion of the solid insulator, and the insulating oil-filled electric device is used. Since the flow electrification evaluation is performed, it is possible to obtain an evaluation closer to the actual deterioration state of the insulating oil-filled electric device.

In the above description, the degree of polymerization of the filter 4 and the deposits on the surface of the filter 4 are separately described. However, when these are combined and the filter 4 is treated, the degree of polymerization with the surface portion of the solid insulator can be further improved. We can get equivalence,
Needless to say, it is possible to obtain an evaluation closer to the state of deterioration.

Embodiment 2 In the first embodiment, the example in which the insulator of the static electricity generating unit of the flow electrification measuring device is formed by the filter 4 has been described. However, the present invention is not limited to this. Even if it is formed, the same processing as in the first embodiment is performed, and the surface portion of the insulator of the static electricity generating portion is equivalent to the deterioration state of the surface portion of the solid insulator of the liquid immersion electric device. If formed as described above, it goes without saying that the same effect as in the first embodiment can be obtained.

Hereinafter, a static electricity generating portion having another shape will be described. However, the insulator of the static electricity generating portion is subjected to the same treatment as in the first embodiment, and has an equivalentity to the state of deterioration of the surface portion of the solid insulator. For example, as shown in FIG. 3, the insulator of the static electricity generating portion is formed by a pipe 8 having a cylindrical shape, and the insulating liquid 2 is passed through the pipe 8. Something to measure is possible.

As shown in FIG. 4, the insulator of the static electricity generating portion is formed of a disk member 9 having a disk shape, and the disk member 9 is rotated and brought into contact with the insulating liquid 2, It is conceivable to measure the amount of static electricity generated in the device. Further, as shown in FIG. 5, the insulator of the static electricity generating portion is formed by a strip-shaped member 10 cut into a dice shape or a rectangular shape, and is stored so as to be packed in the storage container 11. Insulating liquid 2 is introduced into
It is conceivable to contact the strip-shaped member 10 and measure the amount of static electricity generated at this time.

As shown in FIG. 6, the insulator of the static electricity generating portion is formed by a duct 12 formed of a rectangular tube.
It is conceivable to pass the insulating liquid 2 through the duct 12 and measure the amount of static electricity generated at this time. Further, as shown in FIG. 7, the insulator of the static electricity generating portion is formed by a winding roll body 13 formed by winding a sheet-like member in a roll shape, and the insulating liquid 2 is passed through the winding roll body 13. It is conceivable to measure the amount of static electricity generated at that time. Various shapes described above are conceivable.

In such a shape, after a process of forming on the surface portion of the insulator member so as to be equivalent to the state of deterioration of the surface portion of the solid insulator of the liquid-immersion electric device,
A method of processing into each shape, and after processing the insulator member into each shape, a process is performed on the surface of the insulator so as to be equivalent to the state of deterioration of the surface of the solid insulator of the liquid-immersed electric device. It can be formed by any of the applying methods.

In each of the above embodiments, the insulating oil-filled electrical equipment has been described as an example of the liquid-filled electrical equipment, but the present invention is not limited to this. For example, the liquid-filled electrical equipment is a perfluorocarbon-filled electrical equipment. Can be similarly evaluated. In this case, a plastic insulator may be used as the solid insulator used in the perfluorocarbon-containing electric device. The same effect can be obtained by forming the static electricity generating portion using the plastic and forming the surface portion in the same manner as in each of the above embodiments so as to be equivalent to the state of deterioration of the surface portion of the solid insulator. Needless to say.

Further, in each of the above embodiments, the device in which the insulating liquid is brought into contact with the insulator of the static electricity generating section by dropping from above is described. However, the present invention is not limited to this. Needless to say, any device may be used as long as the device can be brought into contact with an insulating liquid and the amount of generated static electricity can be measured.

[0036]

As described above, according to the first aspect of the present invention, there is provided a static electricity generating section for generating static electricity in a fluid, and a flow of a liquid-filled electric device in which a flowing insulating liquid is sealed in a container. The charge evaluation was determined by using an insulator made of the same material as the solid insulator used for the liquid-immersed electrical device in the static electricity generating unit. Since the part is formed so as to be equivalent to the state of deterioration of the surface part of the solid insulator of the liquid-immersed electrical equipment, it is possible to perform the measurement equivalent to the deterioration state of the liquid-immersed electric equipment so that the flow electrification measurement can be performed. A device can be provided.

According to a second aspect of the present invention, there is provided a flow charge measuring apparatus according to the first aspect, wherein the degree of polymerization of the insulator used in the static electricity generating section is determined by the solid insulation used in the liquid-immersed electric equipment. Since it is formed so as to have the same degree of polymerization of the product, it is possible to provide a fluidized charge measuring device that can easily ensure the equivalent state of the deterioration state of the liquid-immersed electric device.

According to a third aspect of the present invention, in the second aspect, when the insulating oil is used as the insulating liquid of the liquid-immersed electric device, the degree of polymerization of the insulator in the static electricity generating section is determined by: Since the degree of polymerization of the solid insulator of the liquid-immersed electric device is determined from the amount of furfural present in the liquid-immersed electric device, a flow electrification measuring device capable of easily adjusting the degree of polymerization of the insulator at the static electricity generating portion is provided. It is possible to do.

According to a fourth aspect of the present invention, there is provided a flow electrification measuring apparatus according to the first aspect, wherein the concentration of the attached matter on the surface of the insulator used in the static electricity generating section is used for a liquid-immersed electric device. Since it is formed so as to have the same concentration as that of the attached matter on the surface of the solid insulator, it is possible to provide a flow electrification measuring device which can easily secure the equivalent state of the deterioration state of the liquid-immersion electric equipment.

According to a fifth aspect of the present invention, there is provided a flow electrification measuring apparatus according to the fourth aspect, wherein insulating oil is used as an insulating liquid of the liquid-immersed electric equipment, and 1,2, In the case where 3-benzotriazole is used, 1,2,3-
Since the concentration of benzotriazole was formed so as to be the same as the concentration of 1,2,3-benzotriazole attached to the surface of the fixed insulator of the liquid-immersed electric device, the insulator in the static electricity generating unit was It is possible to provide a flow electrification measuring device that can easily adjust the concentration of the attached matter.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a flowing charge measuring device according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the amount of furfural and the degree of polymerization.

FIG. 3 is a diagram showing a configuration of a flowing charge measuring device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a flowing charge measuring device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a flowing charge measuring device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a flowing charge measuring device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a flowing charge measuring device according to a second embodiment of the present invention.

[Explanation of symbols]

1 upper container, 2 insulating liquid, 3 cocks, 4 filters, 5 holders, 6 detector, 7 lower container, 8
Pipes, 9 disk members, 10 strip members, 11 storage containers, 12 ducts, 13 rolls.

Claims (5)

[Claims] The present invention relates to a solid insulator used in a liquid-immersion electric device, comprising: a static-electricity generating section for generating static electricity in a fluid; In the fluidized charge measuring device, which is obtained by using an insulator made of the same material as the static electricity generating section, the surface portion of the insulator of the static electricity generating section is made of a solid insulator of the liquid-immersed electric device. A flow electrification measuring device characterized in that it is formed so as to be equivalent to the state of deterioration of the surface portion. 2. The method according to claim 1, wherein the degree of polymerization of the insulator used in the static electricity generating unit is the same as the degree of polymerization of the solid insulator used in the liquid-immersion electric device. Item 4. A flow electrification measuring device according to Item 1. 3. When the insulating oil is used as an insulating liquid in the liquid-immersion electric device, the degree of polymerization of the insulator in the static electricity generating section is determined from the amount of furfural present in the liquid-immersion electric device. 3. The flow electrification measuring device according to claim 2, wherein the degree of polymerization of the solid insulator is defined as follows. 4. A method in which the concentration of deposits on the surface of the insulator used in the static electricity generating unit is the same as the concentration of deposits on the surface of the solid insulator used in the liquid immersion electric device. The flow electrification measuring device according to claim 1, wherein: 5. Insulating oil is used as an insulating liquid for a liquid-immersed electric device.
In the case where 3-benzotriazole is used, the concentration of 1,2,3-benzotriazole on the surface of the insulator of the static electricity generating unit is adjusted to 1 5. The flow electrification measuring device according to claim 4, wherein the flow electrification measurement device is formed so as to have the same concentration as 2,3,3-benzotriazole.