JP2001228117A - Diagnostic method for internal abnormal overheat of power apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormal overheat within a power apparatus with high sensitivity and specify whether the material is deteriorated or not. SOLUTION: The data concerning the quantity of an organic material present in a gas within a power apparatus or the quantity of the decomposed product of the organic material is deducted from the data after a fixed time, thereby, the changed material is specified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting abnormal overheating of a material used in a turbine generator by examining the state of gas inside a power generator, particularly a turbine generator for power supply. It is.

[0002]

2. Description of the Related Art Conventionally, a method of diagnosing materials used in a turbine generator by examining gas in the turbine generator has been disclosed in Japanese Patent Application Laid-Open No. H11-108882.
There is a method described in Japanese Unexamined Patent Application Publication No. 2000-205,878. According to this, the data 1 of the organic substance obtained from the gas inside the turbine generator and the organic substance generated from each single constituent material inside the turbine generator due to deterioration due to heat, discharge, corrosion or friction measured in advance. In this method, the data 2 is collated, and the abnormally heated portion inside the generator is specified based on whether or not the data 1 includes the component of the data 2.

[0003] Examples of the data measuring device include a gas chromatograph, a mass spectrometer, an infrared spectrum, and an X-ray photoelectron spectroscopy.

In order to collate these data, data 2 may be stored in a memory as a database, and may be compared with data 1 using a computer.

Further, in order to measure the data 1, it is preferable that the gas extracted from the turbine generator be passed through an adsorbent, and then the organic substance concentrated and stored in the adsorbent is measured.

[0006]

The above-mentioned abnormal overheating diagnostic method has a large amount of data to be handled, and any part of the data is changed due to deterioration of the insulating material of the turbine generator due to abnormal overheating, discharge, corrosion or friction, and the turbine power generation is changed. It has been difficult to specify which part of the insulating material constituting the machine has deteriorated.

When a mass spectrometer is used as a detector,
Since the mass number axis (that is, the m / e axis) slightly fluctuates within a range of 1 or less due to a temperature change, contamination in the analyzer, and the like, (for example, 355.15 may be observed as 355.2) Direct comparisons were difficult.

[0008]

According to the present invention, there is provided a method for diagnosing abnormal overheating in a power device, comprising the steps of: collecting data on an amount of an organic substance or a decomposition product of an organic substance present in a gas inside the power apparatus after a predetermined time; This specifies the substance that has changed by subtracting from the data.

In the method for diagnosing abnormal overheating inside a power device according to the present invention, data on organic substances present in gas inside the power device is subtracted from data after a certain period of time by calculation using fuzzy set theory. Is what you do.

[0010] In the method for diagnosing abnormal overheating inside a power device according to the present invention, the data is measured by a mass spectrometer, and the fuzzy set theory uses a triangular membership function. It is.

According to the method for diagnosing abnormal overheating inside a power device of the present invention, the data is measured by a mass spectrometer, and the amount of all ions having an m / e ratio in the range of 35 to 500 or this range is used. Is to compare a part of the amount of ions.

In the method for diagnosing abnormal overheating inside a power device according to the present invention, the data is measured by a mass spectrometer, and a specific m / e ratio between 35 and 500 is used.
It is to compare the amount of ions with respect to the / e ratio.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies in order to solve the above-mentioned problems. As a result, in order to obtain data obtained from the gas inside the generator, the gas inside the generator is measured once at normal times. A method has been devised in which a second measurement is performed after a certain period of time has elapsed, and a difference spectrum between the first and second measurements is taken to determine whether there is any component that changes. As a result, data that does not change when an abnormality occurs (eg, oil mist) is ignored.

Further, when a mass spectrometer is used as a detector, the data processing method was intensively studied, and it was found that fuzzy set theory should be applied. The peak of the mass spectrum obtained from the gas collected from the turbine generator at the normal time is given the value 1 as the apex of the triangle, and two points (for example ± 1) covering both sides of the peak and covering the above-mentioned range of variation of the m / e ratio.
) Is defined as the base of the triangle, and a membership function that gives a value of 0 to a region outside this range is defined. Data obtained by multiplying the data of the peak magnitude of the actual turbine generator by this membership function is usually Compare it with the data of the peak size. As a result, it is possible to reduce an error due to a change in the m / e ratio.

Although the above-mentioned problems and the means for solving the problem have been particularly described with respect to a turbine generator, there is a similar problem for other power equipment such as a GIS and a gas-insulated transformer. It is.

FIG. 1 is a flow chart of a measurement sample in the abnormal overheating diagnosis method of the present invention. First, a part of hydrogen gas in the turbine generator 1 is taken out and an organic substance adsorption tube (trap) 2
Through. Organic material is quartz wool 3 packed in a trap.
(FIG. 1A). The trap that has been adsorbed for a certain time is removed and attached to the injection device 4. The removed trap releases organic substances by a heating device in the injection device, which is adsorbed by the cooling trap 5. After raising the temperature to room temperature, 25
The mixture is heated to 0 ° C., and the adsorbed organic substance is injected into the mass spectrometer 6 (FIG. 1B). Normally, this mass spectrum is measured and stored in a computer memory. Then, after a certain time, the same measurement was performed to measure the mass spectrum,
Subtract the spectrum in memory. If there is an abnormality, only a certain component spectrum has a large peak on the plus side. This makes it possible to compare the components that have changed between the normal state and the abnormal state. Here, for example, m /
When a peak having an e ratio of 355 is measured, there is usually a fluctuation of about 0.1 even when the same sample is measured on the same day.
If a difference spectrum is obtained in such a state, for example, a spectrum having a differential wave shape which rises at 355.20 and decreases at 355.15 is obtained. In order to prevent this, all peaks appearing from 354.5 to 355.5 are represented as 355.0, and if the spectrum subjected to this operation is subtracted, the spectrum with zero subtraction will be obtained if there is no change in the original peak. can get. This is an application of crisp set theory.

Further, a pure material 7 used as an insulating material in a power generator is heated by a thermal deterioration device 8 to adsorb the organic substance that has come out to the trap 2. This is attached to the injection device 4 and measured in the same manner as described above (FIG. 1 (c)). Its mass spectrum is as shown in FIG. For example, the peak at 355.15 will be described as an example. At this time, the membership function μ _A (x) is set as in the following equation.

Μ _A (x) = 0, when x <355 = (x-355) / (355.15-355) 355 <x <355.15 = (356-x) / (356-355.15) 355.15 <x If <356 = 0x> 356 The shape of this membership function is a triangle having a vertex at x = 355.15. There is a 355.2 component in the mass spectrum of the gas in the turbine generator, which is (356-355.2) / (356-355.15) =
0.94 multiplied by the actual data is defined as the spectral height.
With this method, the fluctuation of the mass of the actual spectrum can be corrected. M / e ratio of 35 in the mass spectrometer
The following peaks contain water and air, have a drawback that they appear stronger than other components and reduce the S / N ratio of other components.
Those having an m / e ratio of 500 or more have a high boiling point and do not reach the mass spectrometer. Therefore, it is preferable to set the range of the m / e ratio of the mass spectrometer to 35 to 500.

[0019]

Embodiment 1 FIG. 3 is a configuration diagram of an apparatus used in a method for diagnosing abnormal overheating inside a turbine generator according to a first embodiment of the present invention. 11
Is a gas introduction pipe for guiding gas in the turbine generator, 12 is an organic substance adsorption pipe (trap) filled with an adsorbent, 13 is a bypass pipe, and 14 is a valve. 15 is a flow controller for adjusting the flow rate of the introduced gas and reading the flow rate and the integrated flow rate, and 16 is a gas outlet.

Introducing hydrogen gas in the hydrogen-cooled turbine generator in operation at a power generation of 600 MW into the apparatus shown in FIG. 3, opening the valves 14 on both sides of one organic substance adsorption tube 12, and allowing the hydrogen gas to reach the outlet 16 Let it pass. The trap 12 was made of metal, and 1 g of quartz wool was packed therein. The gas discharged from the gas outlet 16 was released to the atmosphere. Flow controller 1
At 5 the hydrogen gas flow rate is set to 2 liters per minute,
After passing hydrogen gas through trap 12 for 5 minutes, all valves 14 were closed. In this way, the trap 12 trapped the organic substance in 50 liters of hydrogen gas.

After the capture of the organic substance in the hydrogen gas was completed, the organic substance adsorption tube 12 as a sample was removed.
Next, the organic substance adsorption tube 12 was heated to 250 ° C. by a head space sampler attached to the mass spectrometer,
The organic substance adsorbed in the tube is adsorbed on the cooling trap 5. Thereafter, the cooling trap 5 was heated to 250 ° C. by high-frequency heating at a stroke, and introduced into the mass spectrometer 6. However, only those having an m / e ratio of 35 to 500 were introduced. First,
The spectrum when there was no abnormality was measured and stored in the memory of the computer, and the spectrum was subtracted from the spectrum when it seems to be abnormal. As a result, the m / e ratio was 355.
It was found that the peak of No. 2 appeared largely. But 3
It was found that a negative peak also appeared at 55.15. The S / N ratio was about 10.

Example 2 When measured as in Example 1, a spectrum having no abnormality had a peak at the m / e ratio of 355.15, while a spectrum which seemed to have an abnormality had a peak at 355.2. Was. When taking the difference spectrum, (356-355.2) / (356-355.15) =
0.94 was applied to the spectrum when there was an abnormality and stored at the position of 355.15. As a result, no negative peak appeared.

COMPARATIVE EXAMPLE 1 A mass spectrometer was set to an m / e ratio of 10 to 500 and set to Example 1.
By doing the same, the S / N ratio of the difference spectrum was extremely poor at about 1. It is considered that this is because the setting of the range of the m / e ratio was inappropriate, and the S / N ratio was lowered by the influence of the component having the m / e ratio of 35 or less.

Example 3 The mass spectrometer was set at an m / e ratio of 35 to 500, and 1 μg of an epoxy resin was wrapped in a magnetic metal and heated at a high frequency.
When the temperature was instantaneously increased to 590 ° C. and the decomposition gas was introduced into the mass spectrometer, peaks with m / e ratios of 213 and 228 appeared. This corresponds to bisphenol A ions. The gas introduced from the generator where the abnormality occurred
The peaks of the e ratios 213 and 228 are present. When the peak of the gas sample in the normal state is subtracted from the peak in the abnormal state, the m / e ratios 213 and 228 are obtained.
It became clear that the peak of was significantly large, and it could be used for detection of abnormality. Also, comparing the total amount of ions with m / e ratios of 50 to 400, a large positive peak appeared when the spectrum when there was no abnormality was subtracted from that when there was abnormality.

[0025]

As described above, according to the present invention, the data on the amount of the organic substance or the amount of the decomposition product of the organic substance is subtracted from the data after a certain period of time.
There is an effect that the sensitivity can be increased and only a substance generated by abnormal overheating can be detected.

Further, according to the present invention, since data is used in fuzzy set theory, there is an effect that fluctuations in the m / e ratio due to a change in the state of equipment or the like can be avoided.

[Brief description of the drawings]

FIG. 1 is a flowchart of a measurement sample in the abnormal overheating diagnosis method of the present invention.

FIG. 2 is a mass spectrum diagram of a measurement sample.

FIG. 3 is a configuration diagram of an apparatus used in the abnormal overheating diagnosis method of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 turbine generator, 2 organic substance adsorption tube, 3 quartz wool, 4 injection device, 5 cooling trap, 6 mass spectrometer, 7 pure material, 8 heat deterioration device, 11 gas introduction pipe, 12 organic substance adsorption tube, 13 Piping for bypass,
14 valves, 15 flow controller, 16 gas outlet.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuharu Kato 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5H615 BB02 SS57

Claims (5)

[Claims] 1. A method for identifying a substance that has changed by subtracting data on the amount of an organic substance or the amount of a decomposition product of an organic substance present in a gas inside a power device from the data after a certain period of time. Abnormal overheating diagnosis method inside power equipment. 2. The electric power according to claim 1, wherein the data of the organic substance present in the gas inside the electric power device is calculated using fuzzy set theory in order to subtract the data from the data after a predetermined time. Diagnosis method for abnormal overheating inside equipment. 3. The method for diagnosing abnormal overheating in power equipment according to claim 2, wherein said data is measured by a mass spectrometer, and said fuzzy set theory uses a triangular membership function. . 4. The method according to claim 1, wherein the data is measured by a mass spectrometer, and the amount of all ions in the m / e ratio range of 35 to 500 or the amount of ions in a part of the range is compared. The method for diagnosing abnormal overheating inside a power device according to claim 1. 5. The method of claim 1, wherein the data is measured by a mass spectrometer and compares the amount of ions for a particular m / e ratio between 35 and 500. 2. The method for diagnosing abnormal overheating inside the power equipment according to 1.