JPH11142467A - Method and device for partial discharge test of oil-immersed insulated equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the type of a partial discharge source based on the partial discharge characteristics of oil-immersed insulated equipment. SOLUTION: A partial discharge test equipment is provided with an occurrence transition pattern storing part 81 which applies an AC voltage to an oil-immersed insulated equipment and obtains and stores the pattern of occurrence transition of a partial discharge charge amount produced by a rise of the applied voltage, an occurrence transition pattern model storing part 82 which stores a plurality of occurrence transition pattern models of the partial discharge charge amount obtained with multiple types of particles used as a partial discharge occurrence source, and a particle discriminating part 83 which reads out the occurrence transition pattern and a plurality of occurrence transition pattern models from the occurrence transition pattern storing part 81 and an occurrence transition pattern model storing part 82 and judges to which of the plurality of the occurrence transition pattern models the occurrence transition pattern is most similar so as to discriminate the types of particles as the partial discharge occurrence source at the time of occurrence of partial discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partial discharge test for an oil-immersed insulation device such as an oil-insulated transformer, and more particularly to a method for determining the type of a partial discharge source and a test apparatus using the method. is there.

[0002]

2. Description of the Related Art As a method for detecting a partial discharge of a high-voltage device, for example, the IEEJ Technical Report (Part II) No. 222
No. "New measurement technology for high-voltage insulation characteristics", which focuses on the pulse generation phase, discharge charge amount, and generation frequency, and detects partial discharge based on information obtained by statistically processing these. .

As a method of determining the type of partial discharge using the characteristics of partial discharge, for example, Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent No. 6421. The technique shown here is based on the regularity of the time-series characteristics of partial discharge pulses.
It is used to distinguish between partial discharge and noise and to determine the type of partial discharge. Here, the time-sequential characteristics include a detection pulse generation interval, a pulse generation frequency, a partial discharge charge amount, a pulse generation phase, a generation frequency, and the like. As a method of determining the type of void, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 60-203866. In this patent, utilizing the fact that the partial discharge characteristics change depending on the type and location of the void defect, the reference partial discharge phase characteristics for diagnosis obtained by changing the type, location and degree of deterioration of the void defect in advance are used. By detecting the degree of similarity, for example, the type and location of a void defect of an electric device such as a mold transformer is diagnosed.

[0004]

By the way, oil immersion insulating devices such as transformers are naturally manufactured under a sufficient quality control. However, in the manufacturing process flow, foreign matter rarely occurs. There may be cases where they are mixed. Such foreign matter may be copper chips or fine wires, insulating chips, or even bubbles.If these foreign matters are present in the high electric field application area of oil immersion insulation equipment, these may be the source. As a result, partial discharge occurs and the insulation reliability as an oil immersion insulation device is impaired.

[0005] The partial discharge test is an effective means for detecting these abnormalities. However, if the type of the partial discharge source can be determined at the same time, it becomes easy to find the cause of the foreign matter in the manufacturing process. Improving the product yield can be achieved by quickly taking measures to eliminate the problem. However, the above-mentioned conventional documents disclose a technique for discriminating the type of a partial discharge source from the partial discharge characteristics, even though there is a type for discriminating the type of the partial discharge, that is, a waveform and a generation form of the partial discharge. There is nothing to do.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances of the prior art, and provides a partial discharge test method and a partial discharge test apparatus capable of determining the type of a partial discharge source of an oil immersion insulating device. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a method of testing a partial discharge of an oil immersion insulating device, wherein an alternating voltage is applied to the oil immersion insulating device, and a change in the amount of partial discharge charge generated with an increase in the applied voltage. A pattern is determined, and it is determined which one of a plurality of generation transition pattern models of the partial discharge charge amount obtained in advance by using a plurality of types of particles as a partial discharge generation source to determine the partial discharge occurrence. This is to determine the type of the particle which is the partial discharge generation source at the time.

According to a second aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulated device according to the first aspect, wherein the partial discharge charge is reduced from a non-discharge level to several thousand pC with an increase in the applied voltage.
After that, the generation transition pattern, which has increased to the level and then has a substantially flat portion, is changed to a fibrous shape whose shape parameter (shape parameter = (maximum particle length) / (shortest particle length); This is a generation transition pattern model using metal particles as a partial discharge generation source.

According to a third aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulated device according to the first aspect, wherein the amount of the partial discharge charge is increased from several tens of pC to several thousand pC with an increase in the applied voltage.
The generation transition pattern having a gradual increase to the C level and having a gradual increase even after reaching about 5,000 pC has a shape parameter of 1.
This is a generation transition pattern model using 5 to 15 metal particles as a partial discharge generation source.

According to a fourth aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulated device according to the first aspect, wherein the amount of the partial discharge charge is increased from several tens of pC to several thousand pC with an increase in the applied voltage.
The generation transition pattern that gradually increases to the C level and increases remarkably when it reaches about 5,000 pC is a generation transition pattern model using substantially spherical metal particles having a shape parameter of less than 1.5 as a partial discharge generation source. .

According to a fifth aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulated device according to the first aspect, wherein the amount of the partial discharge charge is substantially flat at several tens to several hundreds pC with an increase in the applied voltage. And a generation transition pattern that increases significantly afterwards, with a diameter of 500 μm or more and a density of 1000
This is a generation transition pattern model in which dielectric particles existing at 0/100 ml or more are used as a partial discharge generation source.

According to a sixth aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulation device, wherein an alternating voltage is applied to the oil-immersed insulation device, and a transition pattern of a partial discharge charge amount and a transition pattern of the occurrence of the partial discharge charge with an increase in the applied voltage. The inflection point, the presence or absence of the inflection point and the gradient at the inflection point, the gradient at the inflection point, a plurality of partial discharge charge amount previously determined as a partial discharge source using a plurality of types of particles By judging which of the generation transition pattern models is close to the gradient at the inflection point, the type of the particle which is the partial discharge generation source when the partial discharge occurs is determined.

According to a seventh aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulated device according to the sixth aspect.
mm) as a characteristic having both axes, and when there is an inflection point, the gradient at the inflection point is 10,000 pC
When the value is not less than mm / kVrms, the partial discharge generation source is fibrous metal particles having a shape parameter of 15 or more, and when the value is 500 to 1000 pC · mm / kVrms, the shape parameter of the partial discharge generation source is 1.5 to 15 Metal particles of 500 pC · mm / kVrms
If it is less than 1, it is determined that the partial discharge generation source is a dielectric particle having a diameter of 500 μm or more and a density of 10,000 particles / 100 ml or more.

In the method for testing a partial discharge of an oil-immersed insulating device according to the present invention, the generation transition pattern is defined by a partial discharge charge (pC) and an electric field (kVrms /
mm) on both axes, and when there is no inflection point, the partial discharge source has a shape parameter of 1.
It is determined that the particles are substantially spherical metal particles of less than 5.

According to a ninth aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulation device, wherein an AC voltage is applied to the oil-immersed insulation device, and a type of a partial discharge source is determined based on a phase of the obtained partial discharge signal in the AC voltage. Is to be determined.

According to a tenth aspect of the present invention, in the ninth aspect, one cycle of the sine wave AC voltage is set to a phase from 0 degree to 360 degree of a voltage zero point. A phase range of A degrees (where 5 ≦ A ≦ 10, the same applies hereinafter) around the first and second 270 degrees is the first phase range, and 0 to (90−A) degrees and 180 to (270 degrees). -A) When the phase range of degrees is the second phase range, and the generation phase of the partial discharge signal is within the first phase range but not within the second phase range, the partial discharge source Is determined to be solid particles present in the oil, and when the generation phase of the partial discharge signal is within the second phase range, it is determined that the partial discharge generation source is a bubble present in the oil. Things.

According to the present invention, there is provided a partial discharge test apparatus for an oil immersion insulating apparatus, wherein an AC voltage is applied to the oil immersion insulating apparatus, and a generation transition pattern of a partial discharge charge amount with increase of the applied voltage is obtained and stored. Means for storing a plurality of occurrence transition pattern models of the partial discharge charge amount obtained by using a plurality of types of particles as a partial discharge generation source, and reading out the occurrence transition pattern and the plurality of occurrence transition pattern models from both of the means. By judging which of the plurality of occurrence transition pattern models is most similar to the pattern, it is provided with means for judging the type of the particle which is the partial discharge source when the partial discharge occurs. .

According to a twelfth aspect of the present invention, there is provided a partial discharge test apparatus for an oil immersion insulating device, wherein an alternating voltage is applied to the oil immersion insulating device, and a transition pattern of a partial discharge charge amount accompanying the rise of the applied voltage and a transition pattern thereof. Means for obtaining the inflection point of the above, further obtaining and storing the gradient of the occurrence transition pattern at the inflection point, and a plurality of generation transition pattern models of the partial discharge charge amount obtained by using a plurality of types of particles as a partial discharge generation source. Means for obtaining and storing the inflection point and the gradient at the inflection point, and discriminating the presence or absence of the inflection point and reading the gradient at the inflection point from both of the means and discriminating the presence or absence of the inflection point in the occurrence transition pattern and the inflection Discrimination of the presence / absence of an inflection point in any of the plurality of occurrence transition pattern models and determination of whether the gradient at the inflection point is closest to the gradient at the inflection point The Rukoto, but provided with means for discriminating the type of particle is a partial discharge source at the partial discharge occurs.

According to a thirteenth aspect of the present invention, there is provided a partial discharge test apparatus for an oil immersion insulating device, comprising: means for applying an AC voltage to the oil immersion insulating device to detect a partial discharge signal; Means for setting the range, and determining which of the plurality of phase ranges the generation phase of the detected partial discharge signal belongs to, so that the partial discharge source at the time of the partial discharge It is provided with means for determining the type.

[0020]

FIG. 1 is a diagram showing the configuration of a partial discharge test apparatus for an oil immersion insulating apparatus according to the present invention. In the figure, reference numeral 1 denotes an oil immersion insulating transformer as an oil immersion insulating device which is a test sample, 2 denotes an AC power supply for inducing a test voltage in the transformer 1, 3 denotes a filter, 4 denotes a coupling capacitor, and 5 denotes a matching unit. It is. Here, the filter 3 and the coupling capacitor 4 prevent the intrusion of noise from the AC power supply 2, and the matching unit 5 adjusts the waveform of the obtained partial discharge signal (pulse).
6 is a calibration waveform, 7 is a partial discharge detector, 8 is a data processing operation unit that determines the type of the partial discharge source from information such as the magnitude and generation phase of the partial discharge signal from the partial discharge detector 7 and the AC applied voltage. It is.

Incidentally, the inventor of the present invention conducted a partial discharge test by applying an AC voltage to an oil immersion insulation model in which particles of various shapes, sizes, densities, and materials were mixed as foreign substances that could be a source of partial discharge. By analyzing the partial discharge characteristics from various aspects, an effective method for determining the type of the partial discharge source has been conceived. Therefore, in the following, first, the outline of the test results of the partial discharge for each type of these particles will be described, and thereafter, while appropriately referring to the test effects, the method of determining the type of the partial discharge source, which is the main subject, will be described. , Will be sequentially described as an embodiment of the present invention.

The oil immersion insulation model is based on an oil gap formed by inserting a press board between a pair of electrodes and then vacuum-impregnated with sufficiently cleaned insulating oil. A method is employed in which a specified number of the various particles shown are mixed in the oil gap.

(1) Influence of the shape of the copper particles ○ Transition characteristics of the amount of partial discharge charge due to the increase of the oil gap electric field FIGS. 2 and 3 show the increase in the oil gap electric field of copper particles of various shapes. The following shows the generation transition characteristics of the accompanying partial discharge charge amount.
In the figures, the shapes of the particles are as follows. (A) spherical: diameter 500, ξ = 1.0 (b) fibrous: diameter 100 × length 8300, ξ = 83.3 (c) columnar: diameter 200 × length 2100, ξ = 10.4 ( d) cylindrical shape: diameter 500 × length 330, ξ = 1.8 (e) disk shape: diameter 1000 × length 83, ξ = 12.1 (f) rectangular parallelepiped A: 570 × 570 × 200, ξ = 4 ... 2 (g) rectangular parallelepiped B: 360 × 360 × 500, ξ = 2.0 where the unit of dimension is μm, ξ is a shape parameter, and ξ =
It is defined as (maximum length of particle) / (shortest length of particle). Further, the number of mixed particles is one, which is 15 particles / 100 ml in terms of particle density.

Fibrous particles (b) having large shape parameters
In the case of, a partial discharge of several thousand pC suddenly occurs in a low electric field,
After that, even if the oil gap electric field rises, the generation of partial discharge continues,
Eventually, 14.6 kVrms / mm leads to all-way breakdown of the oil gap. As the shape parameter decreases, the amount of partial discharge charge tends to gradually increase as the electric field in the oil gap increases. When the shape of the particles becomes a sphere (shape parameter ξ = 1) (a), the partial discharge charge gradually increases with an increase in the oil gap electric field, and reaches about 5,000 pC.
Suddenly, there is a tendency for the oil gap to be destroyed on the entire road.

O Phase of Partial Discharge FIG. 4 to FIG. 9 show particles (b) to
FIG. 14 shows a partial discharge generation phase in the case of (g). In each oscilloscope waveform, the lower part shows the waveform of the AC applied voltage, and the upper part shows the partial discharge signal. In each waveform of each figure, the applied electric field increases as going from top to bottom, and therefore the amount of partial discharge charge increases.

When viewed as a whole, the partial discharge charge amount is 100
From pC to 2000 pC, the partial discharge occurs intermittently near the peak value of the applied voltage (positive or negative or both positive and negative). When a partial discharge of about 5000 pC is generated and the oil gap is not completely destroyed, it is often observed that the partial discharge is continuously generated over several periods near the peak value of the applied voltage. In the case of the fibrous particles (b) having an extremely high shape parameter (FIG. 4), the state of continuous generation is observed from a partial discharge charge amount of about 2,000 pC. As shown in (2), partial discharge occurs continuously in a phase range from zero voltage to a peak value.

(2) Influence of Number and Size of Spherical Copper Particles Transition Characteristics of Partial Discharge Charge Amount Due to Increase in Oil Gap Electric Field Spherical copper particles of various diameters and densities are mixed in FIGS. 5 shows a change in the partial discharge charge amount with an increase in the oil gap electric field. Regarding particles having a diameter of 5 μm and particles having a diameter of 50 μm, the amount of partial discharge charge gradually increases with an increase in the electric field regardless of the particle density (FIGS. 10 and 11).
And, in the case of particles having a diameter of 5 μm, regardless of the number of particles,
At an electric field of 24 kVrms / mm, the oil gap causes all-road breakdown (FIG. 10). In the case of particles having a diameter of 50 μm, partial discharge occurs at a lower electric field as the particle density is higher, and the electric field leading to all-path breakdown is lower (FIG. 11).

When particles having a diameter of 500 μm are present at a relatively low density (100 particles / 100 ml or less), the amount of partial discharge charge gradually increases as the electric field increases. However, in the case of high-density (1000 particles / 100 ml or more) particles, a sudden increase in the amount of partial discharge charge in a low electric field may be observed. The electric field that causes the oil gap to break all the way is about 15 to 17 kVrms / mm regardless of the particle density (FIG. 12).

In FIGS. 10 to 12, the number of particles is displayed as a parameter, and the conversion values to the particle density in each case are as shown in Table 1.

[0030]

[Table 1]

発 生 Phase of Partial Discharge Generation FIG. 13 to FIG. 15 show partial discharge generation phases in the case of the spherical copper particles of each diameter described above. In each oscilloscope waveform, the lower part shows an AC applied voltage waveform, and the upper part shows a partial discharge signal. In each waveform in each figure, the applied voltage increases as going from top to bottom, and therefore the amount of partial discharge charge increases.

The partial discharge occurs intermittently at the peak value of the voltage, and eventually leads to the complete breakdown of the oil gap. If the oil gap is bubbled, the partial discharge will be continuously observed in the phase range from zero voltage to the peak value (FIG. 13 (2)).

(3) Influence of Dielectric Particles Transition Characteristics of Generation of Partial Discharge Charge with Increase in Oil Gap Electric Field FIGS. 16 to 20 show the increase in oil gap electric field for dielectric particles of various shapes. The following shows the generation transition characteristics of the accompanying partial discharge charge amount. The relationship between the number of particles and the particle density in the figure is the same as in Table 1 above.

FIG. 16 to FIG. 18 show the generation transition of the partial discharge charge amount of fibrous particles (cellulose) and silica particles (equivalent circle diameter, 70 μm, 7 μm). Even if particles having such a size exist at a high density (10000 particles / 100 ml), the influence on the occurrence of partial discharge is small. As the electric field rises, a partial discharge of several tens of pC may occur at a relatively low electric field, but the partial discharge of 100 pC or more occurs when the voltage of the oil gap reaches 22 kVrms / mm or more. is there. When a partial discharge with a charge amount of about 100 pC starts to be generated, the oil gap is immediately destroyed on the entire path.

FIGS. 19 and 20 show pressboard particles (equivalent circle diameter: 680 μm) and silica particles (equivalent circle diameter: 50).
0 μm). Dielectric particles of this size have a particularly high density and have a significant effect on the occurrence of partial discharge. When the pressboard particles are present at a density of 10,000 particles / 100 ml, a partial discharge of 100 pC or less is generated in a low electric field of about 5 kVrms / mm. Further, when the oil gap electric field is increased, a discharge of about 1000 pC is observed at an oil gap electric field of about 13 kVrms / mm.
Then, at 15 kVrms / mm, the entire gap of the oil gap is destroyed (FIG. 19). Silica particles (circle equivalent diameter: 500 μm)
The same tendency is shown in the case of (FIG. 20). When these particles are present at a density of 1000 particles / 100 ml, a partial discharge of several tens of pC is observed at a relatively low electric field. And
As the oil gap electric field rises, the amount of the partial discharge charge gradually increases, and the entire gap of the oil gap is destroyed (about 20 kVrms / mm).

O Partial Discharge Generation Phase FIGS. 21 and 22 show partial discharge generation phases. Pressboard particles (equivalent circle diameter: 680 μm) and silica particles (equivalent circle diameter: 500 μm) have a high density (10000 particles / 100).
ml), a partial discharge of about 100 pC is observed near the peak value of the applied voltage at several kVrms / mm. Furthermore, the oil gap electric field is raised to several thousand p
Electric field where discharge of C is observed (press board particles: 13k
Vrms / mm, silica particles: 18 kVrms / mm)
, The partial discharge occurs continuously over several periods at the peak value of the voltage. Further, when the oil gap electric field is increased, a partial discharge of 5000 pC or more is observed, which leads to a complete breakdown of the oil gap.

Embodiment 1 Here, as a result of analyzing the various partial discharge test data described above, focusing on the generation transition pattern of the partial discharge charge amount with an increase in the applied voltage,
Using the generation transition pattern as a key, the type of the particle that is the partial discharge generation source is determined. FIG. 23 shows a main part of the partial discharge test apparatus according to Embodiment 1 of the present invention, and is an internal configuration diagram of the data processing operation unit 8 of FIG. In the figure, reference numeral 81 denotes an occurrence transition pattern storage unit which obtains and stores an occurrence transition pattern from data of the partial discharge charge amount Q and the AC applied voltage (or electric field) V from the partial discharge detector 7 detected by the occurrence of the partial discharge; Reference numeral 82 denotes an occurrence transition pattern model storage unit that stores a plurality of occurrence transition pattern models of partial discharge charge amounts obtained in advance using a plurality of types of particles as a partial discharge generation source. The plurality of occurrence transition pattern models will be described later. Reference numeral 83 denotes an occurrence transition pattern from the occurrence transition pattern storage unit 81 and an occurrence transition pattern model storage unit 8.
2 is read out from each of the plurality of occurrence transition pattern models, and by judging which occurrence transition pattern model is most similar to the occurrence transition pattern model, the type of the particle which is the partial discharge generation source at the time of the partial discharge is determined. It is a particle discriminating unit for discriminating. Reference numeral 84 denotes an output display unit such as a CRT for displaying the determination result from the particle determination unit 83.

Next, an occurrence transition pattern model storage unit 82
Will be described. First, FIG. 24 shows a generation transition pattern model in which fibrous, particularly fibrous metal particles having a shape parameter of 15 or more correspond to particles serving as a partial discharge generation source. Here, with the rise of the voltage, a discharge of several thousands pC is suddenly generated, but does not lead to the complete breakdown of the oil gap (it does not shift to the bubble-shaped partial discharge generation characteristic). Then, even if the voltage increases, the partial discharge of several thousand pC continues. Eventually, the oil gap is destroyed on the entire road and shifts to a bubble-shaped partial discharge generation mode. The characteristics shown in FIG. 24 are set based on the characteristics shown in FIG. 2B and data complementary thereto.

FIG. 25 shows a generation transition pattern model corresponding to a metal particle having a distorted shape and a shape parameter of 1.5 to 15 as a partial discharge generation source. Here, as the voltage increases, the amount of the partial discharge charge gradually increases from several tens of pC to several thousand pC. Even if a partial discharge of about 5000 pC is observed, the entire gap of the oil gap is not destroyed. Further breakage of the oil gap requires a further increase in voltage. FIG. 25
Are mainly set based on the characteristics (c) to (g) in FIG. 2 and data complementary thereto.

FIG. 26 shows a generation transition pattern model corresponding to a metal particle having a shape parameter of less than 1.5 as a partial discharge generation source. Here, as the voltage rises,
The partial discharge charge also gradually increases from several tens of pC to several thousands of pC, and when a partial discharge of about 5,000 pC is observed, the voltage at that time causes the oil gap to break down the entire path, and the bubble-shaped partial discharge generation characteristics Move to

In particular, the characteristics match when the spherical metal particles having a diameter of 50 μm are present in a wide range of particle densities (100 to 10000 particles / 100 ml) as shown in FIG. In the case where spherical particles of the order of 500 μm are present at a particle density (low density to 100 particles / 100 ml), it is considered that the metal particles having a shape parameter of less than 1.5 as a whole may be acceptable.

FIG. 27 shows a generation transition pattern model corresponding to dielectric particles having a diameter of 500 μm or more and a density of 10,000 particles / 100 ml or more as a partial discharge generation source. Here, several tens of pC-
A partial discharge of several hundred pC is continuously generated. Further, even when the voltage is increased, the same amount of partial discharge charge continues to be generated.
Then, as the voltage rises, a discharge of several thousand pC or more is suddenly observed, and the discharge continues up to the breakdown electric field of the oil gap. The characteristics in FIG. 27 are set based on the characteristics shown in FIGS. 19 and 20 and data complementary thereto.

In the first embodiment, the generation transition patterns obtained from the partial discharge characteristics detected by applying an AC voltage to the transformer 1, which is a test sample, and the generation transition pattern models shown in FIGS. Are compared with each other, and the closest occurrence transition pattern model is selected, and the type of particle corresponding to the occurrence transition pattern model is used as the determination result. The similarity judgment of each pattern may be performed using pure image calculation processing means, but the two patterns to be compared are superimposed and displayed on the screen, and a human judges the degree of similarity from the displayed contents. You may make it.

As described above, in the first embodiment of the present invention, which one of a plurality of previously generated generation transition pattern models corresponds to the generation transition pattern of the partial discharge charge amount accompanying the rise in the applied voltage is determined. The type of particles that are the source of partial discharge can be determined, and analysis of failures in the insulation process, especially in the manufacturing process of the transformer being the test sample, and countermeasures to resolve the failures This has the effect that powerful information can be obtained for planning.

Embodiment 2 The second embodiment focuses on the presence or absence of an inflection point in the occurrence transition pattern obtained in the first embodiment and, if there is an inflection point, the gradient of the occurrence transition pattern at the inflection point. Is used to determine the type of the particle serving as the partial discharge source.

FIG. 28 shows a main part of a partial discharge test apparatus according to Embodiment 2 of the present invention, and is an internal configuration diagram of the data processing operation unit 8 of FIG. In the drawing, reference numeral 85 denotes an occurrence transition pattern calculation unit for calculating an occurrence transition pattern from data of the partial discharge charge amount Q from the partial discharge detector 7 and the AC applied electric field E, which is detected by the occurrence of partial discharge, and 86 denotes an occurrence transition pattern An inflection point for obtaining an inflection point from the occurrence transition pattern obtained by the calculation unit 85 in a manner described later, and further calculating and storing a gradient of the occurrence transition pattern at the inflection point;
A gradient calculation storage unit, 87 is a point of inflection storing the inflection points of a plurality of generation transition pattern models obtained in advance using a plurality of types of particles as partial discharge sources and a gradient at the inflection point;
A gradient model storage unit 88 is an inflection point and gradient operation storage unit 86
It is determined which of the inflection point and the information on the gradient at the inflection point is similar to the inflection point and the information on the inflection point stored in the gradient model storage unit 87. This is a particle discrimination unit that discriminates the type of the particle that is the source of the partial discharge when the partial discharge occurs. Numeral 84 denotes a C for displaying the discrimination result from the particle discrimination unit 88.
This is an output display unit such as an RT.

Next, the point of calculation of the inflection point of the generated transition pattern and the gradient at this inflection point will be described. The partial discharge charge Q is considered as a function of the electric field E applied to the oil gap, and is expressed as Q (E). Here, the electric field E applied to the oil gap
Uses the value calculated from the applied voltage and the insulating structure. Especially,
In the case of large external iron type transformers, from the viewpoint of insulation coordination, the electric field around the high voltage winding has a structure that is approximately uniform (consecutive winding structure). Absent.

Considering the applied electric field range from the occurrence of the partial discharge to the change to the bubble-shaped partial discharge, an inflection point and a gradient of the generated transition pattern obtained by the generated transition pattern calculator 85 are calculated. The inflection point corresponds to a boundary where the occurrence transition pattern changes from a downwardly convex curve to an upwardly convex curve,
The point of the electric field E where B of the following equation (2), which is the second derivative of the function Q (E), becomes 0 is obtained. And, the gradient is A in the following equation (1).
Is a value obtained by substituting E at the inflection point. A = dQ / dE (1) B = d ² Q / dE ² (2)

Next, the data of the inflection point and its gradient stored in the inflection point and gradient model storage unit 87 will be described. First, FIG. 29 is a diagram showing a generation transition pattern model in which fibrous metal particles having a shape parameter of 15 or more as a partial discharge generation source, and an inflection point thereof. Here, 5
10,000p at a low electric field of kVrms / mm or less
It shows an extremely large A (gradient) of not less than C · mm / kVrms. An inflection point exists in the range of the electric field value showing the extremely large inclination. Further, when the partial discharge charge amount Q is 50
At about 00 pC, the value of A becomes a value close to 0, and 50
A partial discharge of about 00 pC continues.

Therefore, the inflection point exists in the generated transition pattern obtained by the inflection point / gradient operation storage unit 86, and the gradient at the inflection point is 10,000 pC · mm / kVr.
If the time is equal to or longer than ms, the particle determination unit 88 determines that the partial discharge generation source is a fibrous metal particle having a shape parameter of 15 or more.

FIG. 30 is a diagram showing a generation transition pattern model in which metal particles having a shape parameter of 1.5 to 15 serve as a partial discharge generation source, and an inflection point thereof. Here, 5-1
500 to 1000 in an applied electric field range of 5 kVrms / mm
A of about pC · mm / kVrms is shown. The partial discharge charge amount Q within the range of A has an inflection point around 500 pC. Therefore, the inflection point / gradient calculation storage unit 86
An inflection point exists in the occurrence transition pattern obtained by the above, and the gradient at the inflection point is 500 to 1000 pC ·
If it is in the range of mm / kVrms, the particle discriminating unit 88
The partial discharge source is determined to be metal particles having a shape parameter of 1.5 to 15.

FIG. 31 is a diagram showing a generation transition pattern model in which dielectric particles having a diameter of 500 μm or more and a density of 10000 particles / 100 ml or more serve as a partial discharge generation source, and a point of inflection thereof. Here, when the partial discharge charge amount Q is in the range of about 200 pC to 500 pC,
50 to 150 pC · mm / less than C · mm / kVrms
A of about kVrms is shown, and there is an inflection point in this range. Then, at about 10 kVrms / mm, the slope suddenly changes to 5000 to 10000 pC · mm / kVrms.

Accordingly, the inflection point exists in the generated transition pattern obtained by the inflection point / gradient calculation storage unit 86, and the gradient at the inflection point is 500 pC · mm / kVrms.
If the particle diameter is less than 500, the particle discriminating unit 88 determines the partial discharge generation source as having a diameter of 500 μm or more and a density of 10,000 particles / 100 ml
Thus, it is determined that the dielectric particles exist.

FIG. 32 is a diagram showing a generation transition pattern model in which substantially spherical metal particles having a shape parameter of less than 1.5 become a partial discharge generation source. In this case, when the partial discharge charge amount Q is up to 50 pC, the gradient is about 5 to 10 pC · mm / kVrms, and when it exceeds 100 pC, it is 700 to 1500 pC.
Although the gradient is C · mm / kVrms, the generated transition pattern is always a downwardly convex curve from a low electric field to about 15 kVrms / mm at which the oil gap is completely destroyed, and there is no inflection point.

Therefore, when there is no inflection point in the generation transition pattern obtained by the inflection point / gradient calculation storage unit 86, the particle discriminating unit 88 determines the partial discharge generation source and the shape parameter whose shape parameter is less than 1.5. It is determined that the metal particles are substantially spherical.

As described above, in the second embodiment of the present invention, the presence / absence of an inflection point and the gradient at the inflection point of the transition pattern of the generation of the partial discharge charge with an increase in the applied voltage are prepared in advance. By judging which of the plurality of occurrence transition pattern models is close to the gradient of the inflection point, it is possible to determine the type of the particle serving as the partial discharge generation source, as in the first embodiment. It is possible to obtain powerful information on manufacturing control and quality control of transformers and the like.

Embodiment 3 Here, as a result of analyzing the various partial discharge test data described above with reference to FIGS. 2 to 22, attention is paid to the generation phase of the obtained partial discharge signal at the AC applied voltage, and from this generation phase, the partial discharge generation source Determine the type. FIG. 33 shows a main part of a partial discharge test apparatus according to Embodiment 3 of the present invention, and is an internal configuration diagram of data processing operation unit 8 in FIG. In the figure, reference numeral 89 denotes a generated phase detection storage unit for detecting and storing a generated phase of the detected partial discharge signal in the AC applied voltage over a predetermined measurement time, and 90 denotes a phase range corresponding to the type of the partial discharge source ( A phase range setting storage unit for setting and storing first and second phase ranges (to be described in detail later), and 91 reads out the generation phase of the partial discharge signal from the generation phase detection storage unit 89, and stores a phase range setting storage unit 90. A partial discharge generation source determining unit that determines the type of the partial discharge generation source when the partial discharge occurs by determining which of the phase ranges set in (1). 84 is a partial discharge generation source determining unit 9
1 is an output display unit such as a CRT for displaying the result of determination from No. 1.

FIG. 34 shows the applied voltage waveform, the phase range corresponding to the type of the partial discharge source, and the partial discharge signal detected within the above range. In the waveform diagram of FIG. (A), Δt ₁
(First phase range) is a phase range represented by the following equation (3). (90 + 180 · n−A) to (90 + 180 · n + A) (3) where 5 ≦ A ≦ 10, n = 0, 1, 2,.

More specifically, if A = 10 degrees, the first phase range Δt ₁ is 80 to 100 degrees,
60 to 280 degrees, 440 to 460 degrees, and so on. That is, it corresponds to the range near the peak value of the applied voltage waveform.

Next, in the waveform diagram of FIG.
₂ (second phase range) is a phase range represented by the following equation (4). (180 · n) to (180 · n + 90−A) (4) where 5 ≦ A ≦ 10, n = 0, 1, 2,.

More specifically, if A = 10 degrees, for example, the second phase range Δt 2 _is 0 to 80 degrees, 180 degrees.
-260 degrees, 360-440 degrees, ... That is,
The range in which the time derivative (d | V | / dt) of the absolute value of the voltage is a positive value equal to or more than a certain value corresponds to the range.

As a result of analyzing the above test data, particularly data relating to the generation phase, it was found that the type of the partial discharge source can be determined based on the criteria shown in Table 2.

[0063]

[Table 2]

That is, the partial discharge source determining section 91 shown in FIG.
Is that when the generation phase of the partial discharge signal is within the first phase range Δt ₁ and not within the second phase range Δt ₂ ,
It is determined that the partial discharge generation source is a solid particle existing in the oil gap, and when the generation phase of the partial discharge signal exists in the second phase range Δt ₂ , it exists in the first phase range Δt ₁ Regardless of whether or not it is determined that the partial discharge generation source is bubbles existing in the oil gap.

The generation phase is measured, for example, for several tens of seconds, and as shown in the following equations (5) and (6), the detection time ratio R of the number of partial discharges detected in both phase ranges Δt ₁ and Δt ₂ is obtained.
1, R2 may be calculated, and the presence or absence of detection in both phase ranges Δt ₁ , Δt ₂ (2 in Table 2) may be distinguished depending on whether these values R1 and R2 are equal to or greater than a predetermined value. .

R1 = n1 / (2 · f · T) (5) R2 = n2 / (2 · f · T) (6) where n1: in the first phase range Δt ₁ Number of detected partial discharge signals n2: Number of detected partial discharge signals in second phase range Δt ₂ f: Applied voltage frequency (Hz) T: Measurement time (second)

[0067] Then, with respect to R1, in the case of R1 ≧ 0.1, partial discharge in the first phase range Delta] t ₁ is (intermittently) determines that occurred. As for R2,
When R2 ≧ 20, it is determined that the partial discharge has occurred (continuously) in the second phase range Δt ₂ .

By employing the above-described determination method, the influence of noise and the like is suppressed, and the type of the partial discharge generation source can be determined more accurately. As described above, in the third embodiment of the present invention, it is determined which of the preset phase ranges the generated phase of the obtained partial discharge signal is in. As in the previous embodiment, it is possible to obtain powerful information on manufacturing control and quality control of transformers and the like.

[0069]

As described above, the partial discharge test method for an oil immersion insulating device according to the first aspect applies an AC voltage to the oil immersion insulating device, and generates a partial discharge charge amount with an increase in the applied voltage. A transition pattern is obtained, and by determining which one of a plurality of generation transition pattern models of the partial discharge charge amount obtained in advance using a plurality of types of particles as a partial discharge generation source, the partial discharge is determined. Since the type of the particle that is the source of the partial discharge at the time of occurrence is determined, the type of the particle that is the source of the partial discharge can be determined by a simple method of comparing the generation transition pattern and the generation transition pattern model. It is possible to obtain useful information for analysis of insulated surface defects in the manufacturing process of insulating equipment and its countermeasures.

Further, in the method for testing a partial discharge of an oil-immersed insulation device according to the second aspect, the amount of the partial discharge charge increases remarkably from a no-discharge level to a level of several thousand pC with an increase in the applied voltage, and thereafter, remains substantially unchanged. An occurrence transition pattern having a portion of
Since the shape transition parameter model (where the shape parameter = (maximum particle length) / (shortest particle length), the same applies hereinafter) has a fibrous metal particle of 15 or more as a partial discharge generation source, a partial transition generation model was used. In particular, it is easily and reliably determined that the discharge source is the fibrous metal particles.

According to a third aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulation device, wherein the partial discharge charge gradually increases from a level of several tens of pC to a level of several thousand pC with an increase in the applied voltage. Since the generation transition pattern having a gradually increasing portion even after reaching the degree is a generation transition pattern model using metal particles having a shape parameter of 1.5 to 15 as a partial discharge generation source, the above-described metal The particles can be easily and reliably identified.

Further, in the partial discharge test method for an oil immersion insulating device according to the fourth aspect, the partial discharge charge gradually increases from a level of several tens of pC to a level of several thousands of pC with an increase in the applied voltage, and is increased to 5,000 pC. Since the generation transition pattern that increases when the temperature reaches the degree is a generation transition pattern model using a substantially spherical metal particle having a shape parameter of less than 1.5 as a partial discharge source, the above-described spherical metal The particles can be easily and reliably identified.

Further, the method for testing a partial discharge of an oil-immersed insulation device according to the fifth aspect has a portion where the amount of the partial discharge charge becomes substantially flat at a level of several tens to several hundreds pC as the applied voltage increases. Since the generation transition pattern that increases thereafter is a generation transition pattern model in which dielectric particles having a diameter of 500 μm or more and a density of 10,000 particles / 100 ml or more are used as a partial discharge generation source,
In particular, it is easily and reliably determined that the particles are the dielectric particles.

According to a sixth aspect of the present invention, there is provided a method for testing a partial discharge of an oil-immersed insulation device, wherein an alternating voltage is applied to the oil-immersed insulation device, and a transition pattern of the partial discharge charge amount and a transition pattern of the occurrence of the partial discharge charge with an increase in the applied voltage. The inflection point, the presence or absence of the inflection point and the gradient at the inflection point, the gradient at the inflection point, a plurality of partial discharge charge amount previously determined as a partial discharge source using a plurality of types of particles By judging which of the generation transition pattern models is close to the gradient at the inflection point, the type of the particle that is the partial discharge generation source at the time of the partial discharge is determined. By a simple method of comparing the presence / absence and the gradient at the inflection point with those of the generation transition pattern model, the type of the particle that is the source of the partial discharge can be determined, and the manufacturing process of the oil immersion insulation equipment is particularly complete. Powerful information can be obtained on the problems and the measures of the surface.

Further, the oil-immersed insulation device according to claim 7 can be configured as follows.
Represents the generation transition pattern as a partial discharge charge (pC).
And the electric field (kVrms / mm) as characteristics on both axes, and when there is an inflection point, when the gradient at the inflection point is 10,000 pC · mm / kVrms or more, the partial discharge source has a shape parameter of 15 In the case of the above fibrous metal particles, 500 to 1000 pC · mm
/ KVrms, if the partial discharge source is metal particles having a shape parameter of 1.5 to 15,
When it is less than C · mm / kVrms, the partial discharge source has a diameter of 500 μm or more and a density of 10,000 / 100 m
Since it is determined that the dielectric particles are present at l or more, it is possible to easily and surely determine that the partial discharge generating source is the fibrous metal particles, the metal particles or the dielectric particles.

In the method of testing a partial discharge of an oil-immersed insulated device according to the present invention, the generation transition pattern is represented by a characteristic having a partial discharge charge (pC) and an electric field (kVrms / mm) on both axes. In addition, if there is no inflection point, it is determined that the partial discharge source is a substantially spherical metal particle having a shape parameter of less than 1.5. Is easily and reliably determined.

According to a ninth aspect of the present invention, there is provided a method for testing a partial discharge of an oil immersion insulated device, wherein an AC voltage is applied to the oil immersed insulated device, and the type of the partial discharge source is determined based on the phase of the obtained partial discharge signal in the AC voltage. The type of partial discharge source can be determined by a simple method of detecting the generation phase of the partial discharge signal. Is obtained.

Further, in the partial discharge test method for an oil immersion insulating device according to claim 10, one cycle of the sine wave AC voltage has a phase from 0 degree to 360 degree of the voltage zero,
Degree and 270 degree centered around A (however, 5 ≦
A ≦ 10, the same applies hereinafter) degree phase range, the first phase range, and 0 to (90−A) degrees and 180 to (2) degrees.
70-A) If the phase range of degrees is the second phase range,
When the generation phase of the partial discharge signal exists in the first phase range and does not exist in the second phase range, it is determined that the partial discharge source is solid particles present in oil, and the partial discharge signal is generated. When the generation phase of the signal is within the second phase range, it is determined that the partial discharge generation source is a bubble existing in the oil, and therefore the solid discharge existing source is a solid particle present in the oil. It can be easily and reliably determined whether the air bubble is a bubble or a bubble.

A partial discharge test apparatus for an oil immersion insulating device according to claim 11 applies an AC voltage to the oil immersion insulating device, and obtains and stores a generation transition pattern of a partial discharge charge amount with an increase in the applied voltage. Means for storing a plurality of occurrence transition pattern models of the partial discharge charge amount obtained by using a plurality of types of particles as a partial discharge generation source, and reading out the occurrence transition pattern and the plurality of occurrence transition pattern models from both of the means. By providing a means for determining the type of particle that is the partial discharge source when the partial discharge occurs by determining which pattern is closest to which of the plurality of occurrence transition pattern models, With such a configuration, it is possible to easily and reliably determine the type of the particle that is the source of the partial discharge.

According to a twelfth aspect of the present invention, there is provided a partial discharge test apparatus for an oil immersion insulating device, wherein an AC voltage is applied to the oil immersion insulating device, and a transition pattern of a partial discharge charge amount accompanying the rise of the applied voltage and a transition pattern thereof Means for obtaining the inflection point of the above, further obtaining and storing the gradient of the occurrence transition pattern at the inflection point, and a plurality of generation transition pattern models of the partial discharge charge amount obtained by using a plurality of types of particles as a partial discharge generation source. Means for obtaining and storing the inflection point and the gradient at the inflection point, and discriminating the presence or absence of the inflection point and reading the gradient at the inflection point from both of the means and discriminating the presence or absence of the inflection point in the occurrence transition pattern and the inflection Discrimination of the presence / absence of an inflection point in any of the plurality of occurrence transition pattern models and determination of whether the gradient at the inflection point is closest to the gradient at the inflection point With this configuration, since a means for determining the type of the particle that is the partial discharge source when the partial discharge occurs is provided, the type of the particle that is the partial discharge source can be easily and reliably determined with a simple configuration. .

According to a thirteenth aspect of the present invention, there is provided a partial discharge test apparatus for an oil immersion insulating device, comprising: means for applying an AC voltage to the oil immersion insulating device to detect a partial discharge signal; Means for setting the range, and determining which of the plurality of phase ranges the generation phase of the detected partial discharge signal belongs to, so that the partial discharge source at the time of the partial discharge Since the means for determining the type is provided, the type of the partial discharge source can be easily and reliably determined with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a partial discharge test device for an oil immersion insulating device according to the present invention.

FIG. 2 shows copper particles of various shape parameters.
It is a test result which shows generation | occurrence | production transition characteristic of the partial discharge charge amount accompanying the increase of an oil gap electric field.

FIG. 3 shows copper particles of various shape parameters.
It is a test result which shows generation | occurrence | production transition characteristic of the partial discharge charge amount accompanying the increase of an oil gap electric field.

FIG. 4 is a test result showing a partial discharge generation phase of fibrous copper particles.

FIG. 5 is a test result showing a partial discharge generation phase of columnar copper particles.

FIG. 6 is a test result showing a partial discharge generation phase of a cylindrical copper particle.

FIG. 7 is a test result showing a partial discharge generation phase of disk-shaped copper particles.

FIG. 8 is a test result showing a partial discharge generation phase of a rectangular parallelepiped A-shaped copper particle.

FIG. 9 is a test result showing a partial discharge generation phase of a rectangular parallelepiped B-shaped copper particle.

FIG. 10 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for spherical copper particles having a diameter of 5 μm at various particle densities.

FIG. 11 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for 50 μm diameter spherical copper particles at various particle densities.

FIG. 12 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for 500 μm diameter spherical copper particles at various particle densities.

FIG. 13 is a test result showing a partial discharge generation phase of 5 μm diameter copper particles.

FIG. 14 is a test result showing a partial discharge generation phase of 50 μm diameter copper particles.

FIG. 15 is a test result showing a partial discharge generation phase of 500 μm diameter copper particles.

FIG. 16 is a test result showing a generation transition characteristic of a partial discharge charge amount with an increase in an oil gap electric field for paper fibers at various particle densities.

FIG. 17 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for 7 μm-class silica particles at various particle densities.

FIG. 18 is a test result showing the generation transition characteristics of the partial discharge charge amount as the oil gap electric field increases with respect to 70 μm-class silica particles at various particle densities.

FIG. 19 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for 680 μm diameter press board particles at various particle densities.

FIG. 20 is a test result showing generation transition characteristics of a partial discharge charge amount with an increase in an oil gap electric field for silica particles having a diameter of 500 μm at various particle densities.

FIG. 21 is a test result showing a partial discharge generation phase of a 680 μm diameter press board particle.

FIG. 22 shows 500 μm diameter silica particles.
It is a test result which shows a partial discharge generation phase.

FIG. 23 is a diagram showing a main part of the partial discharge test device according to the first embodiment of the present invention.

FIG. 24 is a diagram showing a generation transition pattern model in which fibrous metal particles having a shape parameter of 15 or more correspond to particles serving as a partial discharge generation source.

FIG. 25 is a diagram showing a generation transition pattern model corresponding to metal particles having a shape parameter of 1.5 to 15 as particles serving as a partial discharge generation source.

FIG. 26 is a diagram showing a generation transition pattern model in which metal particles having a shape parameter of less than 1.5 correspond to particles serving as a partial discharge generation source.

FIG. 27 is a diagram showing a generation transition pattern model in which dielectric particles correspond to particles serving as a partial discharge generation source.

FIG. 28 is a diagram showing a main part of a partial discharge test apparatus according to Embodiment 2 of the present invention.

FIG. 29 is a diagram showing a generation transition pattern model in which fibrous metal particles having a shape parameter of 15 or more become a partial discharge generation source, and an inflection point thereof.

FIG. 30 is a diagram showing a generation transition pattern model in which metal particles having a shape parameter of 1.5 to 15 become a partial discharge generation source, and an inflection point thereof.

FIG. 31 is a diagram showing a generation transition pattern model in which dielectric particles serve as a partial discharge generation source and an inflection point thereof.

FIG. 32 is a diagram showing a generation transition pattern model in which metal particles having a shape parameter of less than 1.5 become a partial discharge generation source.

FIG. 33 is a diagram showing a main part of a partial discharge test apparatus according to Embodiment 3 of the present invention.

FIG. 34 is a diagram showing an applied voltage waveform, a phase range corresponding to the type of a partial discharge generation source, and a partial discharge signal detected within the range.

[Explanation of symbols]

1 Transformer, 2 AC power supply, 7 Partial discharge detector, 8
Data processing operation unit, 81 Occurrence transition pattern storage unit, 8
2 Occurrence transition pattern model storage section, 83 particle discrimination section, 84 output display section, 85 occurrence transition pattern operation section, 86 inflection point, gradient operation storage section, 87 inflection point, gradient model storage section, 88 particle discrimination section, 89 generation phase detection storage unit, 90 phase range setting storage unit, 91 partial discharge generation source determination unit.

Claims (13)

[Claims] 1. An AC voltage is applied to an oil immersion insulating device, and a generation transition pattern of a partial discharge charge amount with an increase in the applied voltage is determined. By judging which of a plurality of generation transition pattern models of the partial discharge charge amount obtained as described above, the part of the oil immersion insulation device that determines the type of the particle that is the partial discharge generation source when the partial discharge occurs Discharge test method. 2. As the applied voltage increases, the amount of partial discharge charge increases from a no-discharge level to a level of several thousand pC.
The generation transition pattern having a substantially flat portion is represented by a shape parameter (where shape parameter = (maximum length of particle) /
2. A partial discharge test for an oil immersion insulation device according to claim 1, wherein a generation transition pattern model using fibrous metal particles having a minimum particle length of 15 or more (shortest length of particles) is used. Method. 3. The generation transition pattern having a gradually increasing portion of the partial discharge charge amount from several tens of pC levels to several thousands of pC levels with an increase in applied voltage and having a gradually increasing portion even after reaching approximately 5,000 pC is defined as a shape parameter. 2. A partial discharge test method for an oil-immersed insulation device according to claim 1, wherein the generation transition pattern model uses 1.5 to 15 metal particles as a partial discharge generation source. 4. The generation transition pattern in which the amount of partial discharge charge gradually increases from several tens of pC levels to several thousands of pC with an increase in applied voltage, and increases remarkably when it reaches about 5,000 pC, is represented by a shape parameter of 1. 2. A partial discharge test method for an oil-immersed insulation device according to claim 1, wherein a generation transition pattern model using substantially spherical metal particles of less than 5 as a partial discharge generation source is used. 5. A generation transition pattern having a portion where the amount of partial discharge charge is substantially flat at a level of several tens to several hundreds pC with an increase in applied voltage, and a generation transition pattern which has a remarkable increase thereafter, has a diameter of 50
2. A partial discharge test method for an oil immersion insulation device according to claim 1, wherein a generation transition pattern model is formed using dielectric particles having a density of 10,000 particles / 100 ml or more at 0 μm or more as a partial discharge generation source. 6. An AC voltage is applied to an oil immersion insulating device, and a generation transition pattern of a partial discharge charge amount and an inflection point of the generation transition pattern in accordance with an increase in the applied voltage are determined. When the inflection point is present, the gradient at the inflection point is the gradient at the inflection point of any of a plurality of generation transition pattern models of the partial discharge charge amount obtained in advance using a plurality of types of particles as the partial discharge generation source. A partial discharge test method for an oil immersion insulating device in which the type of a particle that is a partial discharge generation source when the partial discharge occurs is determined by determining whether the particles are close to each other. 7. The generation transition pattern is represented by a characteristic having a partial discharge charge (pC) and an electric field (kVrms / mm) on both axes, and when there is a point of inflection, the gradient at the point of inflection is: When it is 10,000 pC · mm / kVrms or more, the partial discharge generation source is fibrous metal particles having a shape parameter of 15 or more, and 500 to 1000 pC.
When C · mm / kVrms, the partial discharge source is a metal particle having a shape parameter of 1.5 to 15,
When it is less than 500 pC · mm / kVrms, the partial discharge source has a diameter of 500 μm or more and a density of 10,000 /
7. The method according to claim 6, wherein it is determined that the dielectric particles are present in an amount of 100 ml or more. 8. The generation transition pattern is represented by a characteristic having a partial discharge charge (pC) and an electric field (kVrms / mm) on both axes, and when there is no inflection point, the partial discharge generation source has a shape. The method according to claim 6, wherein the parameter is determined to be a substantially spherical metal particle having a parameter of less than 1.5. 9. A partial discharge test method for an oil immersion insulating device in which an AC voltage is applied to the oil immersion insulating device, and a type of a partial discharge source is determined from a generation phase of the obtained partial discharge signal in the AC voltage. 10. One cycle of a sine wave AC voltage has a phase from 0 to 360 degrees of a voltage zero point, and its center is 90 degrees and 270 degrees, and A is before and after that (5 ≦ A ≦ 10
The same applies hereinafter) to the first phase range, and 0 to (90-A) and 180 to (270-A).
When the second phase range is set as the second phase range, the generation phase of the partial discharge signal exists within the first phase range and the second
If the partial discharge signal does not exist within the phase range, it is determined that the partial discharge source is solid particles present in the oil, and if the partial discharge signal generation phase is within the second phase range, partial discharge occurs. The method according to claim 9, wherein the source is determined to be bubbles existing in the oil. 11. A means for applying an AC voltage to an oil immersion insulating device, obtaining and storing a generation transition pattern of a partial discharge charge amount with an increase in the applied voltage, and a part obtaining a plurality of types of particles as a partial discharge generation source. Means for storing a plurality of occurrence transition pattern models of the discharge charge amount, and reading out the occurrence transition pattern and a plurality of occurrence transition pattern models from both means, wherein the occurrence transition pattern is any of the plurality of occurrence transition pattern models A partial discharge test apparatus for an oil immersion insulating device, comprising: means for determining the type of particles that are a partial discharge generation source when the partial discharge occurs by determining whether or not they are closest to each other. 12. An AC voltage is applied to the oil immersion insulating device, and an occurrence transition pattern of a partial discharge charge amount and an inflection point of the occurrence transition pattern with an increase in the applied voltage are determined. Means for calculating and storing the gradient of the generated transition pattern, calculating and storing the inflection points of the plurality of generated transition pattern models of the partial discharge charge amount obtained by using a plurality of types of particles as the partial discharge generation source and the gradient at the inflection point Means for distinguishing the presence or absence of an inflection point and reading the gradient at the inflection point from both means, and distinguishing the presence or absence of the inflection point in the occurrence transition pattern and the gradient at the inflection point are any of the plurality of occurrence transition pattern models. The occurrence of partial discharge at the time of occurrence of the partial discharge by distinguishing the presence or absence of an inflection point in the A partial discharge test apparatus for an oil immersion insulating device, comprising: means for determining the type of particle as a source. 13. A means for applying an AC voltage to an oil immersion insulation device to detect a partial discharge signal, a means for setting a plurality of phase ranges corresponding to a plurality of partial discharge sources, and the detected partial discharge signal A portion of the oil immersion insulating device having means for determining the type of the partial discharge source when the partial discharge occurs by determining which of the plurality of phase ranges the generated phase belongs to. Discharge test equipment.