TWI292040B - Method for diagnosing the insulation of electric apparatus - Google Patents

Description

1292040 TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for diagnosing performance degradation of an insulator used in an electric machine over a long period of time. [Prior Art] For the method of diagnosing the deterioration of the performance of the electrical insulation of the electrical equipment, the insulation of the electrical equipment such as the power distribution equipment is deteriorated after a long period of time due to the surrounding environment, electrical stress, and mechanical stress. For example, the insulation resistance measurement, the partial discharge measurement, the leakage current measurement, the decomposition gas measurement, and the "n y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y The measurement, the measurement of the direct contact with the insulator, the measurement of the non-contact, the measurement of the electric machine in the action I state, and the measurement in the stop state, etc., are selected from various diagnostic methods. The most suitable method for diagnosing an electrical machine is to diagnose the deterioration of the insulation. In the specific technique of the above insulation diagnosis, it has been revealed that, for example, it has a main circuit portion for performing measurement for constituting & The surface of the solid insulating material is measured by the sensing unit of the same power distribution as the solid insulating material provided in the main circuit portion.帛1 step of surface resistance; according to the pre-requisite 冤ό 乂 乂 、 、 、 、 、 、 或 或 或 或 或 或 或 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 The measurement of the rate, the second step of the moisture dependence curve of the clothing, the clothing, and the surface resistance curve of the mildew, the surface resistivity of the acne ... X dependence and the table measured in the first step Electric and hand, to determine the life of the electrical equipment, or calculate the third step of the remaining life of the power distribution equipment 315587 5 ! 292 〇 4 ,, and then the life determination threshold as "in the relative humidity 8 (four) A method for diagnosing the life of a power distribution equipment having a fixed surface value of a value of 1 〇 9 Ω (refer to, for example, the patent document [Patent Document U 曰 Patent Application Publication No. 2003_9316 (Page 2, Figure 1 and Table 2) [Explanation of the Invention] [Problems to be Solved by the Invention] In the above-mentioned conventional insulation diagnosis method for an electric machine, since the electric resistance of the material to be diagnosed is set to 4, the surface resistivity of the material is performed. Measuring time It is susceptible to noise caused by external environment such as high humidity, and there is a case where the reliability of (4) is reduced. Although the load result can be corrected using the humidity dependency reference curve, 'because of its basics The information is valuable and the crime is low, so there is a problem that it is impossible to carry out correct diagnosis. In addition, when performing electrical measurement such as surface resistivity on site, it is necessary to have a lining and speciality for the measurement (4), but it is not In the case where the threshold value is not related to the absolute environment (distribution voltage, etc.), it is a case where the target insulator is fixed, and when there is a large change in conditions or the like, a problem may occur. On the contrary, the problem may have been solved without any problem. The present invention solves the above problems, the type, shape, and use of the object, and thus there is a use method and environment that does not meet the initial diagnosis of the initial diagnosis. The developer is still available for use beyond the established age, and the purpose is to provide a 315587 6 1292040 —, / 亍 疋 B inch is not Environmental impact portion can be easily measured on site and piece goods may be determined by deterioration of the original integrated mesh, it serves to improve the electrical insulation diagnostic method of rolling an accuracy of diagnosis. Furthermore, it is an object of the present invention to provide a logically determinable threshold

The value is an electrical insulation diagnostic method that estimates the life with an objective and high precision. LI

[Solution to Problem] * The insulation diagnosis method for an electric machine according to the present invention includes: a township: a diagnosis item for deterioration of an insulator used in an electric machine, and a plurality of measurement items related to the disconnection item From the new product and the use of the mouth insulation sample φ la & the ancestors of the scientific research under the fixed environment of the measurement project ", 'and in the general environment to take the measurement of the MT test (horse Mahalanobis Taguchi System: The measurement data of the Lennon project is expressed as a single indicator, and the correlation between the == standard and the measurement data of the diagnostic item is made. Qiu M 'Zhuo spares to indicate the diagnosis project and influence the diagnosis project. The characteristic map or characteristic formula of the relationship between the brothers and the brothers: the insulator of the insulation diagnosis, will be based on each measurement:: the measurement data is used as an indicator Representing the third step of reading the value of the diagnostician corresponding to the -(4) mark in the pre-description phase in ;;; =; _ and using the characteristic map prepared in advance in the second step or characteristic To prepare the value of the diagnostic item and the external:: p ^ ^ r L obtained in the 3 step of the relationship between the characteristics of the relationship, in order to take the impact of the external environmental factors on the diagnosis of insulation diagnosis point 315587 7 1292040 The fourth step of the correction value of the item '纟中' uses the correction value to diagnose the deterioration state of the insulation. [Effect of the Invention] According to the present invention, the selected fish 吟 i & & 疋 疋 is related to the 5 township project A plurality of measurement items of the relationship, and a correlation map indicating the correlation between the measured value of the plurality of measurement items and the measured value of the diagnostic item, and the characteristic map or characteristic of the external environmental judgment material for correcting the diagnostic item are prepared in advance. And the measurement data obtained by carrying a plurality of measurement items is represented by a finger, and the correlation value and the characteristic diagram or the characteristic formula are used to obtain the correction value of the diagnosis item, and then the correction value is used. In order to carry out the deterioration diagnosis of the insulation, it is possible to obtain the diagnostic data of the noise that has been excluded from the receiving environment in a fixed environment, and can be obtained in any external ring. In the following, the accuracy of the deterioration diagnosis is improved. [Embodiment] The present invention considers the type of insulation to be diagnosed and the external environment (temperature, humidity, external) when performing insulation deterioration diagnosis of electrical equipment. Miscellaneous to determine the diagnosis project, selected multiple are very relevant to the diagnosis project, and the external environment is not affected at the site, and the measurement project is easy to be performed in a short time, and then based on the measurement results of the above-mentioned 敎 project, comprehensive judgment and progress J f JE The deterioration diagnosis is performed, and then the logical value is used to estimate the "life" or "residual life". * Fig. 1 is a flow chart showing the procedure of the insulation diagnosis method for the electrical device according to the first embodiment. Figure 1 illustrates the steps of the present invention. 315587 1292040 First, the first step is to select the diagnostic item for judging the deterioration of the electrical equipment of the diagnostic object, and select a plurality of measurement items with strong correlation with the above diagnosis. The reason for using the diagnostic item and the plurality of measurement items in the insulation diagnosis is explained earlier. The deterioration of the insulation differs greatly depending on the type of the insulation and the :::, external environment. Therefore, suitable for the insulator: for example, for electrical measurement, the most appropriate factor can be selected from items such as "partial discharge", "surface resistance", "(4)", "leakage current", etc. When the project is measured on-site, it is not easy to be affected by external noise. This is the number of items that are degraded or the cause of deterioration of the above-mentioned diagnostic items, or the items that are highly correlated and received at the site, and are used as the measurement. item. 2. When the "Partial Discharge" is used as a diagnostic item, the "Direction of the measurement item selected by the light =" is selected as the measurement item. Then, H.. is only tested, so as to make a comprehensive judgment on the money between the original diagnostic items and from multiple items. Insulation ^=, _ is the same as the insulation of the electrical equipment of the measuring object, and the insulation sample of the product (for example, the deterioration buckle used by the user for a long period of time). From the above insulation = such as temperature 20. (:, wet sound Α ςΛ () / U 疋% 楗 (for example, 吟 谓 , , , 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 For each sample, the measurement of each measurement item is in the field of quality engineering... Maharan Nobis... System Law_

System, hereinafter referred to as the MT laguchl method) is expressed as an indicator (Maharanobis is separated from 315587 9 1292040), and the correlation diagram of the phase of the measurement result of the index and the diagnosis item is made (refer to Fig. 4). , the details are described later), and the main curve (su) represented by the a line is obtained. The value of the horizontal axis of the relevant graph no diagnostic item value is the value in the reference environment. In the second step, the horse prepares and prepares a characteristic map (see Fig. 5, which will be described later in detail) or a characteristic formula (S12) indicating the relationship between the diagnosis item and the external environment. The external environmental factor here refers to the environmental project in which the data of the diagnostic project in the i-th step is taken as the reference environment, which is temperature and humidity in the above example. However, for a number of diagnostic projects, it takes a lot of labor to produce characteristic maps according to the multiple environmental factors. Therefore, if the monthly environment is particularly large, the external environmental factors (such as humidity) are only relevant to the practical use. Already full. The production method of the raw image is to first prepare a plurality of insulator samples (this may be different from the insulation sample of the first step), and to produce samples having different deterioration states due to accelerated deterioration, and then externally to each of the above samples. The environment is to be held for the diagnosis project, and the measurement results are, for example, the horizontal axis indicates the size of the outer P-Bing factor. The vertical axis indicates the measured value of the diagnostic item. The external environment of the project is due to the multiple characteristic curves of the parameters. Further, the characteristic curve may be numbered, and then the mathematical curve may be used (the specific example thereof will be described later). The first step and the second step above are the preparations prepared in advance before the insulation diagnosis of the electrical equipment to be diagnosed is performed on site. Then explain the third step. After that, it was made for the actual machine. 315587 10 1292040

Lai: Ding and diagnostic work. First, the measurement target insulator of the electrical equipment to be diagnosed is subjected to diagnostic measurement data for each measurement item. Although it varies depending on the measurement item, it is usually measured directly in the power failure state, or the sample is taken from the insulation and the sample is tested. The measurement results were used as an indicator using the MT method. Then, using the main curve of the correlation diagram created in the above-mentioned step, the number of diagnostic items corresponding to the index is read as SU. The value of the diagnostic item obtained here is as explained earlier.

Since the value of the standard % & is not affected by the external environmental factors at the time of measurement, the measurement results in a fixed environment are available. Next, in the fourth step, the characteristic map or the characteristic formula created in the second step is used, and the relationship between the external environmental factor and the diagnosis item is created based on the value of the diagnostic item obtained in the third step (the value in the reference environment). Characteristic curve. The specific production method will be described later. This characteristic curve is a characteristic curve which takes the external factor (for example, humidity) of the diagnostic item at the time of measurement in the field as a parameter. So for example the outer ring

The humidity can be read from the characteristic curve by humidity to humidity 100 due to humidity. /. The value of all diagnostic items (S15). ..., as described above, according to the mth step, since the determination is performed by a plurality of measurement items having a strong correlation with the diagnosis item, the diagnosis item can be judged in various aspects, and the external environment factor of the measurement time point can be ignored. In order to obtain the characteristic value of the diagnostic item value of the parameter in the external environment, the value of the diagnostic item corresponding to any external environmental value can be obtained, and the deterioration state of the insulator can be accurately grasped. The following explains the method of diagnosing the life with good accuracy with respect to the above results. 315587 11 1292040 The first preparation is to indicate the diagnosis item and the _ life presumption map, and draw the life of the ^ and the passage. In the step, the initial value of == (that is, the value of the new product, this is a η main, 疋, ,, 口 口) and the value of the diagnostic item at the time of π 疋 in the fourth step, even in the case of * 7 Test, pre-determined for the diagnosis of the field, i S 1 5). The intersection of the line of 丄 and (5) values is used to estimate the life of the Shoulun corpse from the time of the new product to the point of intersection. " From the time of measurement... The passage of time is the life, and the lapse of the 7th „ is estimated to be the remaining life. (To Zhao Qi 7, the details are described later.) ... As described above, according to this method, the value of the diagnostic item used to measure the time value can be pushed into the π heart-external brother-in-law pusher #, so the situation can be implemented. (4) Outside, the clothing is then applied to the insulation diagnosis method of the electrical equipment to illustrate the specific diagnostic method. The types of insulation used in the fork distribution equipment are mainly Polyester resin insulation, epoxy (ep〇xy) resin insulation, phenol resin insulation, etc. It has been shown in recent years that the deterioration process of these insulations is the surface contamination of the insulation_hygro-insulation The resistance drops, and the leakage current increases—the dry band caused by joule heating (the micro-form formed by the surface of the insulator when it is wet (micr...dry gap) flashes (scintill) Id) the occurrence of discharge (small discharge along the surface) - the occurrence of tracking (sparking) caused by the occurrence of tracking (discharge), and the progress of the road. It is known as the deterioration diagnostic item, and the surface resistance of the insulator is measured. It is effective to carry out the judgment. The first step is to select the diagnostic item and the measurement item. The diagnosis 315587 12 1292040 "The target is selected as the surface resistance value of the insulator which is effective when the deterioration of the insulation as described above is performed" However, if the surface resistance value is easily affected by external environmental noise such as humidity, for example, even if the same insulation has the same deterioration state, the surface resistance value may have a maximum of five digits when the humidity is different (1) 〇5) The above measurement error. Therefore, directly: the influence of the noise from the external environment, the cause of the deterioration of the resistance of the two clothing surfaces, and the consideration of the main work & To select the chemical correlation measurement of the surface resistance of the surface, which is the "ion (ion)" and the chromatic aberration gloss. As a measurement item, the ion implanter &# carved in the type of nitrate ion, sulfate ion, gas ion, sodium ion, mesh, 1 Shi ~ ~ ion 4, color difference (lightness), color (Yellow), etc. If the degree of correlation between the insulation of the disk and the target object is known in advance, it can be appropriately classified as "field release". In the present embodiment, the most appropriate measurement item is selected from each item by the following method. Fig. = Fig. 3 is a flow chart showing the selection of the measurement item from the measurement item candidate. The figure 3 shows the effect of determining the validity of the measurement item. The following is a description of the effect. A i ^ ^ , ...,,, brother 2 map, the first choice is recognized as two: for: the number of measurement items related to the surface resistance value of the broken item: such as color, gloss, composition (carbonized chlorine, etc.), away = (S21). The horizontal axis of Fig. 3 indicates the candidate for the material item. Disk A 4 m points 7 Depending on the effect of the project, the SN of the project will be used when the project is not used. The spearness (effectiveness) is measured by the MT method (signal t0 noise mi 〇 L in the figure) Ratio) indicates (S22). When the third is not in use, the "none" table y is used as "the item is "having" ''", compared to the vertical axis. It can be seen from the figure that the 315587 13 1292040 4 is tilted to the lower right and the difference is larger. The effect is significant. Then, 'exclude the invalid measurement item candidate, φ. Extract the more significant effect from the effective measurement item candidate'. Select the SN 屮 之 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( The color shirt (page acid ion and sulfuric acid one item is selected as the measurement item. Among them, the selected measurement items are confirmed to be related, and if the degree is not sufficient, then another measurement item /, 5 ΛΑ仏A collar is selected. In addition, the method of judging the validity and selecting the candidate by the above SN ratio can be applied to other than the above examples. The above-mentioned SN ratio is used to determine the operation of the measurement item. The measurement item is extracted and the effect of the main deterioration factor is described. Next, a plurality of new insulation products of the same insulation as the measurement target insulation and insulation samples of different use products during use are prepared, and the samples are colored (yellow) The measurement is carried out in three items of the amount of nitrate ions and the amount of sulfate ions. For the color, for example, the concentration of yellow in the (four) pigment is used. For each ion amount, for example, ion implantation and high sensitivity are used. The reflectance photometer measures the concentration of the material transferred to the ion test paper. The color and the amount of material are almost independent of temperature and humidity, so it can be smashed at room temperature. Then the surface resistance i is measured for the same sample as above, 35. Since the surface resistance value is affected by the humidity, for example, the noise is shielded from the external environment by a noise shield, and the temperature is 2 (rc, humidity 5 〇% of the fixed environment). The measurement is carried out under the (reference environment). Then, the above-mentioned measured color and the two kinds of ions are obtained by using the MT method as an index (Maharanos distance), which is used to represent the surface resistance value and Maha. Lon Nobis distance 315587 14 1292〇4 性 性 第 第 第 第 第 第 第 # # # # # # # # # # # # # # # # # # 关 关 关 关 关 关 关 关 关 关 关 关 关 相关 相关 相关 相关 相关 相关 相关The number of points obtained indicates that the farther the new product is, the greater the difference from the new product is, and the deterioration is proceeding. If the distance is known to be the distance, the surface resistance value can be obtained from the main curve. The surface resistance value is the value in the reference environment. , / / in the table followed by the second step Observing the surface resistance value: the influence of the environment' is the humidity dependence of the surface resistance. Second: the surface: the resistance value even if it is the same deterioration product, it will have a color shirt and ion amount due to the humidity. In order to measure the project, due to the influence of the female |, degree, the temperature is not considered here. Waiting for the temperature first prepares a plurality of insulation samples. The insulation samples are in different periods of ==, and After being exposed to hydrazine in an aqueous solution such as sulphuric acid at room temperature, the temperature is set to "5% change between 5% and 95% in the environmental chamber. The surface resistance value at each time point is 5 and the surface resistance value is expressed. The characteristic curve of the relationship. The broken line in the figure indicates the curve obtained from the measurement result, that is, the measurement result is obtained by a smooth connection. A indicates the curve and line of the new product, and the lower curve of B, C'D, E, etc. indicates the insulation characteristic curve with the greater degree of deterioration. From this curve, it is known that the greater the deterioration, the more susceptible it is to humidity. When making the characteristic curve, the more samples with different degrees of deterioration are prepared, and the characteristic curve with different degrees of deterioration can be obtained from the characteristic oil line diagram to form the pole subdivision. However, the more the number of samples, the more time it takes to take the data. And labor. Therefore, if the curve can be digitized, the humidity of any surface resistance value is corrected. The characteristic curve obtained by the measurement is as shown in Fig. 5, 315587 15 1292040 'similar to one part of the normal distribution curve, the gauss function 眚# and ^ / . ^ n technology is right Γ ) ' with a Gaussian distribution curve The number of the formula is as follows: as disclosed in Japanese Laid-Open Patent Publication No. 2003-9316. The line in Fig. 5 is the dry curve of the field, such as Putian, which uses this technique and uses the characteristic curve of the Egorge distribution function to describe the characteristic curve.... It is expressed by the characteristic formula corresponding to the actual 敎. Characteristic curve AU characteristic surface resistance value: the use of the characteristic formula, as long as the surface of the humidity (received) is known... the characteristic curve can be drawn, and the surface resistance value of the humidity can be easily read. The preparation work before the actual diagnosis. Next, in the third step, the surface of the object to be diagnosed is set, and the surface deposits of the target insulator are used to measure the color/(yellow), the amount of the succinic acid ion, and the sulfate ion. For the color example, the concentration of yellow is measured by a simple color spectrometer. For each ion amount, for example, ion-bin paper and a reflectance photometer are used to measure the ion/length of the ion-printed paper. The color shirt and the two kinds of ions are expressed as the - index (Maharanos distance). Then the distance from the main curve of the correlation diagram in the βth step is read for the Mahalanobis distance. The surface resistance value is a value in the state of humidity of 5〇%, that is, the step of the surface resistance of the surface of the temperature of 20C and the humidity of 5G% is often determined from the target insulator in the field without any measurement conditions. Therefore, when the deterioration tendency is diagnosed by the enthalpy measurement measured in time series, the measurement result can be directly used without correction. Next, the humidity is corrected in the fourth step. Fig. 6 shows the characteristic 315587 16 1292040: An explanatory diagram of the method of use, that is, in the third step, the correlation map uses the surface resistance value to be green on the line with the humidity of 50% in the figure (point p). When the characteristic curve prepared by the mountain is prepared, if the point p is On the curve, the curve is the humidity dependence curve of the surface resistance of the insulator of 2. If the point p is not present, the curve passing through the point P can be recreated by the distance between the curves of the upper and lower sides of the P. It is not necessary to prepare the characteristic map in advance, and the surface resistance value can be drawn by the characteristic formula of the Gaussian distribution function, that is, the humidity dependence curve of the surface resistance value obtained by the measurement, According to the thick arrow in the figure, when the surface resistance is 2 (log ρ Ω ) at a humidity of 5〇%, the thick solid line: the humidity dependence curve can be obtained from the formula according to the value. The surface resistance value at the time of measurement in any humidity is obtained. Next, the service life is estimated based on the above results. Fig. 7 is a graph showing the life estimation of the insulation diagnosis method for an electric machine according to the present embodiment. The life estimation map is as follows. Indicates the surface resistance value (in logarithmic index). The horizontal axis indicates the materialing period (time passage), and the new resistance point is plotted at the vertical K point A). Then the point is plotted in the third bullet. The surface resistance value (point B) at a humidity of 5 (%) obtained from the correlation diagram. = In addition, the value of any humidity used as a reference for the estimation of the life is obtained from the characteristic curve obtained in the above step 4, And draw on the map (dot. Point: Indicates that the humidity is always 50%. Therefore, for example, when comparing with other measured time points _ to find the tendency, the diagnosis can be performed, and Z is irrelevant to the weather. If point C indicates a value of, for example, a humidity of 1〇〇%, it can be judged by the rigorous condition of 315587 17 !292〇4〇. It is usually set to be more realistic when the wind is blowing in the rain. Next or straight: This line is the deterioration tendency line of the insulator to be measured. , ,,. Where: In the meantime, if you want to implement the life expectation in a timely manner, #describes the tendency of deterioration before. The line can be corrected to match the actual situation. 2' The pre-set table = value is plotted on the w-axis for life estimation. The inter-value can be set, for example, according to regulations, and can be calculated and calculated. The usage period corresponding to the intersection of the upper phase line and the deterioration tendency line (point D) is estimated as the life. '·, ("', , + U This is the estimated remaining life from the time when the life can be reduced to the measurement U. The deterioration tendency from the point D to the right in the middle of the 磕, the lower the heart rate of each line and the line The speed of the heart is accelerated due to the subsequent deterioration rate, and the probability of forming the grounding and short-circuiting is rapidly increased. As described above, according to the invention of the embodiment, it is possible to obtain the influence of the noise of the external environment in a fixed environment. At the same time, as for the external environmental factors at the time of measurement, the external environment can be obtained because of the characteristic curve of the value of the diagnostic item of the tea, thereby obtaining the value of the measured item corresponding to any external soil value. In addition, since the judgment is performed by a plurality of selected measurement items that are related to the diagnosis item, it is possible to perform judgment on various aspects of the diagnosis item, and the measurement accuracy can be improved. In addition, when the life expectancy is estimated by the measurement result, since the diagnostic item value of 315587 18 Ϊ 292040 can be used, it is possible to carry out the environment in the external environmental state in which various kinds of reflections are predicted. The lifetime estimation. Again, 'from the measurement results obtained to the external environment should be because when the correction parameter' by using a characteristic equation, i.e., can be easily produced external environment by the objective for the results to be due to the dependence graph. According to a second embodiment in that

Find the method. Insulation diagnostic method for electric equipment of the second Bech-shaped evil machine The threshold value for estimating the life is obtained theoretically. The measurement data is obtained from the insulation of the milk machine, and the electrical equivalent circuit diagram of the electrical device insulation according to the second embodiment of the present invention is shown in Fig. 8 . As shown in the figure, the gates of the conductive portion 2 and the conductive portion 2 are provided with an insulator 3 formed of an epoxy resin for insulating and supporting the conductive portion. The shape of the insulator used in the electrical machine is various, and is shown in the figure for convenience of explanation. In the figure, the symbol is calculated. Next, the calculation method of the threshold is described. The insulating surface distance of the insulator 3 is set to L, and the applied voltage between the conductive portions 1 and 2 is v. The average unit length of the insulator 3 has a static capacitance of C1 to Cn, and the surface resistance is ri to strictly speaking. It is also necessary to consider the internal insulation resistance r of the insulator 3, but at a commercial frequency (50/60 Hz), The impedance of the insulator 3 is dominant because of the electrostaticity 315587 19 1292040 (R > 1 / C, C is the static capacitance of the entire length of the insulator 3), so it can be ignored. Here, the procedure for the deterioration of the insulator 3 from the tracing of the surface to the destruction of the insulation is as described in the first embodiment, and the method is such that the surface of the insulator is dehydrated and the insulation resistance is lowered, and the leakage current is increased. - Dry band formation - > Flicker discharge occurs - Tracking discharge occurs, progress - full path destruction. In Fig. 8, the electrostatic capacitance of the insulator of the dry tape is expressed by Cg, and the surface resistance is represented by Rg. The impedance Zp of the impedance Z (i and the average unit length of the other portion) is expressed by the first formula and the second equation. [Math. 1] - (1) ν^2+(1/ω Cg) 2 7Γ = 7^ω(:η—...(2) yRn2 +(1/ω Cn)2 The impedance of the whole insulator 3 with voltage applied is Ζ, and since Z=Zd+ZP·η, the first and second are The formula is substituted for 第 to get the third formula. [Math 2]

RgA〇Cg +

Rn/oCnVRn2+(l/oCny Π (3) Here, 'n is the number of insulation lengths along which the insulation 3 is divided into unit lengths' and thus is a coefficient proportional to the distance L of the insulation along the surface. 3 When the condition of the scintillation discharge occurs on the surface, the surface resistance Rg of the dry band portion which is not shown in Fig. 8 315587 1292040 is very large, and the potential sharing on the surface of the insulator 3 is determined by the impedance of the static capacitance Cg. The following 4 formulas are approximated. [Math 3] Z and Ι/coCg +

Rn/coCn ▽Rn2 + (1/ωΟι) " η (4) The relationship between the applied voltage V applied to the insulator 3 and the voltage Vg applied to the dry band can be expressed by the following formula 5 [Math 4]

Vg = V

ZdZd+Zp-n

V (l/c〇Cg)/ l/c〇Cg +

Rn/q>Cn V^n2+(l/(〇Cn)2 n • · · · (5) When the condition of the applied voltage v when the vg exceeds the spark start voltage vi is obtained right here, the flash discharge occurs voltage vi It can be calculated by the following formula 6. [Math 5] ^

Vi = toCg|l/mCg + {-/^^-|njvi (6) cg is dependent on the gap length t of the dry band, and vi is also dependent on t. Vi is represented by the spark start voltage of the so-called pascher, and vi under atmospheric pressure air can be approximated by the following formula 7. [Math. 6] 315587 21 1292040 vi = 235x10 037丨1〇g(t/_76)丨1·53 (7) In the sixth formula, Rn is shifted to the left and sorted to find the surface resistance of the discharge. In the case of RS, Rs can be obtained by the following formula 8. (Lx T) ......(8)

Rs (ΜΩ) = a X Eb / The point at which the possibility of discharge occurs. When the discharge occurs, the ions in the amplifying atmosphere react chemically, and a compound which promotes deterioration of the performance of the insulator is generated, so that the tracking progresses to the entire path, so that the discharge starting surface resistance value Rs is set to a threshold value. In the above formula, E is the rated voltage (kv), L is the insulation creeping distance [(7) claw), T ^ insulation thickness (_), where & and b are constants determined by the frequency and the type of insulation. It can be seen from the eighth formula that the discharge starting surface resistance value Rs is inversely proportional to the product of the insulating creeping distance and the insulating thickness. The above-described discharge start surface resistance value Rs is determined by the material, the shape, and the use condition of the insulator. According to the invention of the second embodiment, the type of the insulator, the shape, the use voltage, and the like Since the numerical value and the discharge start voltage are logically obtained as the threshold value, an objective and accurate threshold value can be obtained, and based on the threshold value, the life and the remaining life can be accurately estimated. [Industrial Applicability] The present invention can be applied to, for example, the diagnosis of an insulator used in a switchgear of a power distribution machine widely used in a chemical company, a power gas company, a food company, or the like, and correct diagnosis of insulation deterioration. It can prevent grounding and short-circuit accidents from happening in the first place. 315587 22 1292040 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing an insulation diagnosis method for an electric device according to a first embodiment. Fig. 2 is a flow chart showing the selection of measurement items for the insulation diagnosis method of the electric device according to the first embodiment. Fig. 3 is a view showing the effect of the insulation diagnosis method for the electric machine according to the second embodiment, which determines the effectiveness of the measurement item. Fig. 4 is a view showing the correlation between the surface resistance value and the Mahalanobis distance in the insulation diagnosis method for an electric device according to the first embodiment. Fig. 5 is a view showing the humidity and the surface in the first embodiment. Relationship Between Resistance Values Fig. 6 is an explanatory view showing a method of using the characteristic curve of the first embodiment. A characteristic diagram of the insulation diagnostics of electrical machines. Method for Insulating Insulation of Electrical Apparatus Fig. 7 is a view showing the estimation of the life of the first embodiment. Insulation Diagnostic Method for Electrical Apparatus Fig. 8 is a circuit diagram showing electrical equivalents of the insulation of the electrical equipment of the second embodiment. Method [Component Symbol Description] Insulator

Cl to Cn, Cg static capacitance 315587 23 1 Λ 2 Conductive part 2

Rl to Rn, Rg surface resistance V applied voltage

Claims (1)

Patent Application No. 93106125 (July 24, 1996) Patent Application Range: An electrical insulation diagnosis method for electricians, which has the following: selected equipment for diagnosing deterioration of insulation used in electrical equipment And the plural-疋 project determined in a manner that is related to the diagnostic project and can be less affected by the external environment to the aforementioned diagnostic items, taken from the insulation samples of the new product and the used product in the solid state The measurement data of the above-mentioned diagnostic items, and the measurement data of each measurement item are taken in a general environment, and the measurement data of the above-mentioned one, J疋 items are measured by the MT (Mahalanobis Taguchi System) method. The first step of the correlation diagram for the correlation between the indicator and the measurement data of the aforementioned diagnostic item is expressed by an indicator; the preparation is used for the table; ^, +, from the ancient times, the project is broken and The second step of the characteristic map or the characteristic formula that affects the relationship of the diagnostic item; It is indicated that the third step of the value of the aforementioned diagnosis item corresponding to the step of reading the first finger in the step of reading the data in the first step of the data is used in the data. The characteristic formula is used to produce the value of the aforementioned characteristic map or item prepared in advance with the above: and the characteristics obtained by the diagnosis obtained in the third step described above are obtained from the relationship between the <" The curve, the fourth step of the insulation diagnosis and the correction value of the objective diagnosis of the above-mentioned diagnostic item σ 丨 丨 , , , , 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 315 (July 24, 1996) Diagnosis by the above-mentioned correction value 2. If the scope of application of the patent is the first item, the electricity of the item; the deterioration condition of the object. The insulation diagnosis method of the above-mentioned first machine, the first bobbin φa仃* When the deterioration state is broken, the value of the diagnosis item obtained in the fourth step is the value of the diagnosis item obtained in the fourth step, and the value of the table 吟I s >; use the table does not move After the project and time pass, it is used as the presumption map of the relationship between the provincial and the servant A & 以, to make the "progressive line" and presumed the life with the intersection of the clothing value in advance. Month · 'L The threshold of the 0-off project 3. As in the case of the electrical machine of the second application of the patent scope, the threshold value is based on the spark voltage generated by the absolute % &&& / 8 ^ ^ 诹 U, The calculation of the calculation is performed. The discharge occurs. 4. In the case of the insulative cold-breaking of the earth, the electro-flux machine in the items i to 3 of the patent application, the selection, in the first step, is performed in the first step.乂, f number, count: The measurement data obtained from the multiple test items candidate related to the diagnosis project, and the SN ratio is determined by the MT method and the candidate for the measurement item with strong correlation is selected as the measurement target. α 5. As claimed in the patent scope! The electric machine crying 'turn-off method according to any one of the items 3 to 3, wherein the second step is to measure the foregoing diagnostic item by a parameter of the external environment in advance from the plurality of (four) edge samples, and to The curve represents the relationship between the aforementioned diagnostic items and the aforementioned external environmental factors, and the characteristic curve is digitized by a Gaussian distribution function. 6. If the electric machine is crying according to any one of the third to third aspects of the patent application (amendment) 315587 25 1292040 Patent Application No. 93106125 (July 24, 1996) Insulation diagnosis method, wherein The surface resistance of the insulator is the aforementioned diagnostic item, and the color difference and the number of ions are the aforementioned measurement items, and the humidity is the external environmental factor. 26 (Revised) 315587 1292040 mi u 柒, designated representative map: (1) The representative representative of the case is: (1). (2) The symbolic representation of the symbol of the representative figure: The representative figure has no component symbol and its meaning. If you have a chemical formula in this case, please uncover the chemical formula that does not reveal the most invented features.