CN113970542A - Gas detection device and method for rotating equipment, and stator coil deterioration monitoring system - Google Patents
Gas detection device and method for rotating equipment, and stator coil deterioration monitoring system Download PDFInfo
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- CN113970542A CN113970542A CN202010717419.4A CN202010717419A CN113970542A CN 113970542 A CN113970542 A CN 113970542A CN 202010717419 A CN202010717419 A CN 202010717419A CN 113970542 A CN113970542 A CN 113970542A
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 345
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 166
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- 239000013043 chemical agent Substances 0.000 claims 3
- 238000005259 measurement Methods 0.000 description 24
- 230000000694 effects Effects 0.000 description 10
- 238000002845 discoloration Methods 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 8
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- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/66—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides a gas detection device, a gas detection method and a stator coil deterioration monitoring system for a rotating device. A gas detection device (21) measures the concentration of nitrogen oxides generated from a stator coil (10) of a rotating machine (1). The disclosed device is provided with: a nitrogen oxide suction device (25) for sucking the internal atmosphere of the rotary equipment; and a nitrogen oxide concentration detection unit (27) that is connected between the rotary equipment and the nitrogen oxide suction device, and through which the internal ambient gas passes, the nitrogen oxide concentration detection unit (27) detecting the concentration of nitrogen oxide contained in the internal ambient gas, and an ozone absorption filter (28) for absorbing ozone in the internal ambient gas that passes through the nitrogen oxide concentration detection unit and the rotary equipment being connected therebetween.
Description
Technical Field
The present invention relates to a gas detection device, a gas detection method, and a stator coil degradation monitoring system for a rotating machine used for monitoring degradation of a semiconductive layer of a stator coil of a rotating machine such as a high-voltage rotating machine.
Background
A stator coil of a rotating machine such as a high-voltage rotating machine includes a wire coil in which a plurality of wires to which an insulating coating is applied are bundled, an insulating layer provided so as to wind the wire coil with a mica tape (mica tape) or the like, and a semiconductive layer, and the stator coil is housed in a slot of a stator core and is connected, and these are impregnated with a thermosetting resin and cured.
Since the stator coil is subjected to electric pressure, thermal pressure, and mechanical pressure during operation, the insulating layer and the semiconductive layer are likely to deteriorate over time.
With respect to deterioration of the insulating layer of the stator coil, partial discharge occurring due to minute voids in the insulating layer is eroded over the years, eventually leading to equipment failure (insulation breakdown). Therefore, a partial discharge monitoring technique has been developed that detects the level of occurrence of partial discharge in a rotating machine during operation and performs maintenance and update to the detected level before a failure occurs (for example, patent documents 1 and 2).
Patent document 2 is a method of: according to the relation between the quantity of the partial discharge electric charge and the concentration of ozone generated, the ozone is measured to detect the occurrence of the partial discharge generated in the coil of the rotating equipment without being affected by the high frequency noise, and the deterioration of the insulating layer of the rotor coil is monitored.
On the other hand, the semiconductive layer of the stator coil is deteriorated by partial discharge occurring in a minute gap between the insulating layer and the semiconductive layer. If the semiconductive layer deteriorates, partial discharge occurs, and deterioration of the semiconductive layer is promoted. Here, although partial discharge occurs in the entire stator coil including the insulating layer and the semiconductive layer, in the present application, discharge occurring on the stator coil surface due to deterioration of the semiconductive layer is referred to as "surface discharge".
When deterioration is promoted by surface discharge occurring in the semiconductive layer, ozone (O) is generated at this time3) Nitrogen oxides (NO, NO)2) Such corrosive gas combines with moisture in the airThereby generating nitric acid. This may cause a reduction in strength of the metallic structural members of the rotary machine due to rusting and corrosion, and may cause secondary failure, which may prevent stable operation of the rotary machine.
Since the deterioration of the semiconductive layer is accompanied by surface discharge, the tendency of deterioration can be found by a partial discharge test performed in the past, but when partial discharge occurring in the insulating layer is dominant, it is difficult to discriminate the deterioration of the semiconductive layer.
Therefore, the main method for evaluating the deterioration of the semiconductive layer is to stop the operation of the rotary machine, extract the rotor, and visually inspect the stator coil. In order to inspect the deterioration of the semiconductive layer, it is necessary to detach the frame of the rotating equipment, draw out the rotor, and visually inspect the state of the stator coil. However, the high-voltage rotating equipment is a main equipment in a power plant or a factory, and evaluation of deterioration of the semiconductive layer by stopping operation is not desirable in production work in the factory.
Documents of the prior art
Patent document
Patent document 1: japanese Kohyo publication No. 2012-503463
Patent document 2: japanese patent laid-open publication No. 2018-200179
Disclosure of Invention
Problems to be solved by the invention
The techniques of patent documents 1 and 2 described above are techniques for monitoring deterioration of an insulator of a rotor coil of a rotating machine and partial discharge, and no method for evaluating deterioration of a semiconductive layer of a stator coil by a method other than visual inspection has been established.
Therefore, monitoring the deterioration of the semiconductive layer of the stator coil is important in stable operation of the rotary equipment, and a method of evaluating the deterioration of the semiconductive layer of the stator coil in a state (online) in which the rotary equipment is operating, rather than stopping the rotary equipment as in the conventional visual inspection, is required.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a gas detection device for a rotating machine, a gas detection method, and a stator coil degradation monitoring system, which are capable of continuously and stably operating the rotating machine by monitoring degradation of a semiconductive layer of a stator coil of the rotating machine.
Means for solving the problems
In order to achieve the above object, a gas sensor for a rotary machine according to one aspect of the present invention measures a concentration of nitrogen oxides generated from a stator coil of the rotary machine, the gas sensor comprising: a nitrogen oxide suction device for sucking an internal atmosphere of the rotary equipment; and a nitrogen oxide concentration detection unit connected between the rotary machine and the nitrogen oxide suction device, through which the internal ambient gas passes, the nitrogen oxide concentration detection unit detecting a concentration of nitrogen oxide contained in the internal ambient gas, and an ozone absorption filter for absorbing ozone in the internal ambient gas passing therethrough, the ozone absorption filter being connected between the nitrogen oxide concentration detection unit and the rotary machine.
In addition, a gas detection method for a rotary machine according to one aspect of the present invention measures concentrations of ozone and nitrogen oxides generated from a stator coil of the rotary machine, wherein the ozone concentration detection unit is connected to the rotary machine, the ozone concentration detection unit detects the concentration of ozone contained in the internal ambient gas by allowing the internal ambient gas of the rotary machine to pass through the ozone concentration detection unit, and the nitrogen oxide concentration detection unit is connected to the rotary machine, the nitrogen oxide concentration detecting section detects the concentration of nitrogen oxide contained in the internal ambient gas by passing the internal ambient gas of the rotary equipment through the nitrogen oxide concentration detecting section, and, an ozone absorbing filter for absorbing ozone in the internal atmosphere gas passing through the inside of the ozone absorbing filter is connected between the nitrogen oxide concentration detection unit and the rotary device.
A stator coil degradation monitoring system in a rotating machine according to an aspect of the present invention includes: a gas detection device including a nitrogen oxide suction device for sucking an internal atmosphere gas of a rotary machine, a nitrogen oxide concentration detection unit connected between the rotary machine and the nitrogen oxide suction device and passing through the nitrogen oxide concentration detection unit by the internal atmosphere gas, an ozone absorption filter connected between the nitrogen oxide concentration detection unit and the rotary machine and absorbing ozone in the internal atmosphere gas passing through the inside of the rotary machine, an ozone suction device for sucking the internal atmosphere gas of the rotary machine, and an ozone concentration detection unit connected between the rotary machine and the ozone suction device, the ozone concentration detection portion detects the concentration of ozone contained in the internal ambient gas by the internal ambient gas passing through the ozone concentration detection portion; and a deterioration monitoring unit that determines the degree of erosion and expansion of the semiconductive layer based on the concentration of ozone (or nitrogen oxide, or ozone and nitrogen oxide) detected by the gas detection device, and notifies the state of the stator coil when it is determined that the erosion and expansion cause deterioration of the semiconductive layer.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the gas detection device, the gas detection method, and the stator coil degradation monitoring system for a rotating machine according to the present invention, it is possible to continue stable operation of the rotating machine by monitoring degradation of the semiconductive layer of the stator coil of the rotating machine.
Drawings
Fig. 1 is a schematic configuration diagram showing a rotary machine used in the present invention.
Fig. 2 is a line II-II view of fig. 1, showing a stator coil accommodated in a slot of a stator core in a rotating apparatus.
Fig. 3 is a diagram showing a configuration of a stator coil degradation monitoring system according to a first embodiment of the present invention.
Fig. 4 is a diagram showing the configuration of the concentration measuring section of the stator coil degradation monitoring system.
Fig. 5 is a flowchart showing a deterioration monitoring process performed by the deterioration monitoring unit of the stator coil deterioration monitoring system.
Fig. 6 is a graph showing a relationship between a degree of erosion spread of the semiconductive layer of the stator coil (change in erosion area) due to occurrence of surface discharge and an ozone concentration that changes according to the degree of erosion of the semiconductive layer.
Fig. 7 shows changes in the concentration of ozone and nitrogen oxides generated inside the rotary machine with the elapse of the operating time of the rotary machine.
Fig. 8 shows an apparatus for detecting the concentration of nitrogen oxides in a gas detection apparatus used in the present invention.
Fig. 9 is a line VIII-VIII of fig. 8.
Fig. 10 shows an apparatus for detecting the concentration of ozone in a gas detection apparatus used in the present invention.
Description of the reference numerals
1: a rotating device; 2: an apparatus main body; 3: an equipment frame; 3 c: a gas extraction aperture; 4: a rotor; 5: a stator; 6: a rotating shaft; 7: a rotor coil; 8: a stator core; 9: a groove; 10: a stator coil; 11: a wire; 12: a wire coil; 13: an insulating layer; 14: a semiconducting layer; 15: a wedge; 20: a stator coil degradation monitoring system; 21: a concentration measuring part (gas detecting device); 22: a measurement data recording unit; 23: a deterioration monitoring unit; 24: a display unit; 25: a first gas suction device (a suction device for nitrogen oxides); 26: a second gas suction device (a suction device for ozone); 27: a nitrogen oxide detecting tube (nitrogen oxide concentration detecting section); 28: an ozone absorbing filter; 29: an ozone probe tube (ozone concentration detection unit); AL: aluminum.
Detailed Description
Next, a first embodiment of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are denoted by the same or similar reference numerals. It is to be noted, however, that the drawings are schematic, and the relationship of the thickness to the planar size, the ratio of the thicknesses of the respective layers, and the like are different from those in reality. Therefore, the specific thickness and size should be determined in consideration of the following description. It is needless to say that the drawings also include portions having different dimensional relationships and ratios.
The first embodiment shown below exemplifies an apparatus and a method for embodying the technical idea of the present invention, but the technical idea of the present invention does not specify the material, shape, structure, arrangement, and the like of the structural members as the material, shape, structure, arrangement, and the like described below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
[ Structure of rotating apparatus ]
Fig. 1 shows a rotary machine 1 used in a first embodiment according to the present invention.
The rotating device 1 includes a device main body 2 and a device frame 3 covering the outer periphery of the device main body 2.
The apparatus body 2 is constituted by a rotor 4 and a stator 5.
The rotor 4 includes: a rotary shaft 6 rotatably supported by end plates 3a and 3b formed at both ends of the apparatus frame 3 via bearings (not shown); and a rotor coil 7 fixed to the rotating shaft 6.
The stator 5 includes: a cylindrical stator core 8 facing the outer periphery of the rotor coil 7 with a predetermined gap therebetween; and a stator coil 10 accommodated in a plurality of slots 9 formed in an inner circumferential surface of the stator core 8.
Fig. 2 is a diagram illustrating the stator coil 10 accommodated in the slot 9 of the stator core 8. The stator coil 10 includes: a wire coil 12 obtained by bundling a plurality of wires 11 to which an insulating coating is applied; an insulating layer 13 formed by winding mica tape or the like around the outer periphery of the wire coil 12; and a semiconductive layer 14 formed by impregnating a thermosetting resin around the insulating layer and curing the thermosetting resin. They are accommodated and wired inside the groove 9 by the wedge 15, and impregnated and cured with a thermosetting resin.
Power is supplied to the stator coil 10 from a three-phase cable (not shown).
[ deterioration monitoring System for stator coil of rotating machine ]
Fig. 3 shows a stator coil deterioration monitoring system 20 of the rotating equipment 1 of the first embodiment.
The stator coil degradation monitoring system 20 includes: a concentration measuring portion 21 as a gas detecting device for measuring ozone (O) generated by surface discharge due to deterioration of the semiconductive layer 143) Nitrogen oxides (NO, NO)2) The concentration of (c); a measurement data recording unit 22 for recording the measurement data of ozone and nitrogen oxide measured by the concentration measuring unit 21; a deterioration monitoring unit 23 that monitors deterioration of the stator coil 10 based on the measurement data recorded by the measurement data recording unit 22; and a display unit 24 that displays the monitoring level of the rotating machine 1 in the degradation monitoring unit 23.
As shown in fig. 4, the concentration measuring section 21 includes: a first gas pumping device 25 and a second gas pumping device 26; a nitrogen oxide detection pipe 27 connected between the first gas suction device 25 and the rotary apparatus 1; an ozone absorbing filter 28 connected between the nitrogen oxide detection pipe 27 and the rotary machine 1; and an ozone detecting tube 29 connected between the second gas suction means 26 and the rotary apparatus 1.
A chemical that reacts with ozone gas and changes color is contained in a sealed tubular container of the ozone detection tube 29, reacts with ozone contained in the internal atmosphere of the rotary machine 1 and changes color, and the concentration of ozone is measured based on the degree of the color change.
A chemical that reacts with nitrogen oxides and discolors is contained in a sealed tubular container of the nitrogen oxide detection tube 27, reacts with nitrogen oxides contained in the internal atmosphere of the rotary machine 1 and discolors, and the concentration of nitrogen oxides is measured based on the degree of discoloration.
A material having a property of absorbing or decomposing ozone, such as iron or aluminum, is contained in the sealed tubular container of the ozone absorbing filter 28.
Next, the operation of the concentration measuring section 21 will be described.
When the first gas suction device 25 is driven, the internal ambient gas of the rotary apparatus 1 is sucked and passed through the ozone absorbing filter 28, the nitrogen oxide detecting tube 27, and the gas passed through them is discharged from the first gas suction device 25 to the outside. At this time, the first gas suction device 25 adjusts the flow rate and the cumulative flow rate to be optimum for the internal ambient gas passing through the nitrogen oxide detection tube 27, so that the nitrogen oxides (NO, NO) can be detected with high accuracy2) The concentration of (c). In addition, the ozone in the internal atmosphere gas passing through the ozone absorbing filter 28 is absorbed, so that only the internal atmosphere gas containing nitrogen oxides passes through the nitrogen oxide detecting tube 27, and the concentration of nitrogen oxides is measured according to the degree of discoloration of the nitrogen oxide detecting tube 27.
In addition, when the second gas suction device 26 is driven, the internal ambient gas of the rotary apparatus 1 is sucked and passes through the ozone detecting tube 29, and the gas passing through the ozone detecting tube 29 is discharged from the second gas suction device 26 to the outside. At this time, the second gas suction device 26 adjusts the flow rate and the cumulative flow rate of the internal atmosphere gas passing through the ozone probe tube 29 to be optimal, so that the concentration of ozone can be detected with high accuracy, and the concentration of ozone can be measured from the degree of discoloration of the ozone probe tube 29.
Then, the concentration of ozone (ozone concentration measurement value) OC measured by the ozone probe tube 29 of the concentration measurement unit 21 and the concentration of nitrogen oxide (nitrogen oxide concentration measurement value) NC measured by the nitrogen oxide probe tube 27 are recorded in the measurement data recording unit 22.
Next, the deterioration monitoring unit 23 of the stator coil deterioration monitoring system 20 shown in fig. 3 determines the respective corrosion expansibility and the lifetime of the semiconductive layer 14 of the stator coil 10 based on the ozone concentration and the nitrogen oxide concentration measured by the concentration measuring unit 21. The deterioration monitoring unit 23 includes a case where it is configured by an arithmetic processing device such as a microcomputer, and a case where an operator manually performs measurement and a part of data processing. The degradation monitoring process performed by the degradation monitoring unit 23 will be described with reference to fig. 5.
[ degradation monitoring processing by the degradation monitoring unit ]
In this degradation monitoring process, first, in step ST1, the ozone concentration measurement value OC and the nitrogen oxide concentration measurement value NC stored in the measurement data recording unit 22 are read, and the process proceeds to step ST 2.
In step ST2, the degree of erosion of the semiconductive layer 14 of the stator coil 10 is determined based on the concentration of the nitrogen oxide. In this determination, the nitrogen oxide concentration measurement value NC is used as the immediate correspondence level threshold value NTSThe determination is performed as described above. Then, NC ≧ NTSIf it is determined that the erosion of the semiconductive layer 14 has spread to such an extent that the stator coil 10 needs to be replaced, the process proceeds to step ST3, and the display unit 24 displays a "stator coil replacement is required", and the degradation monitoring process is terminated. On the other hand, NC in step ST2<NTSThen, the process proceeds to step ST 4.
In step ST4, the degree of erosion of the semiconductive layer 14 of the stator coil 10 is determined based on the concentration of ozone. In this determination, whether or not the ozone concentration measurement value OC is the immediate correspondence level threshold value OT3 is usedSThe determination is performed as described above. Then, at OC ≧ OT3SIf it is determined that the erosion of the semiconductive layer 14 has spread to such an extent that the stator coil 10 needs to be replaced, the process proceeds to step ST3, and the display unit 24 displays a "stator coil replacement is required", and the degradation monitoring process is terminated. On the other hand, OC in step ST4<OT3SThen, the process proceeds to step ST 5.
Step ST5 is also a step of determining the degree of erosion of the semiconductive layer 14 of the stator coil 10 based on the concentration of ozone. In this determination, whether or not the ozone concentration measurement value OC is the alarm level threshold OT2SThe determination is performed as described above. In this case, the alarm level threshold OT2STo the immediate correspondence level threshold OT3SA small value. Then, at OC ≧ OT2SIf it is determined that the erosion of the semiconductive layer 14 is gradually progressing, it is determined that the stator coil 10 needs to be replaced, the process proceeds to step ST6, the display unit 24 displays an "alert level" (the stator coil needs to be replaced), and the degradation monitoring is terminatedAnd (6) performing visual processing. On the other hand, OC in step ST5<OT2SThen, the process proceeds to step ST 7.
Step ST7 is also a step of determining the degree of erosion of the semiconductive layer 14 of the stator coil 10 based on the concentration of ozone. In this determination, whether or not the ozone concentration measurement value OC is the monitoring-required level threshold OT1 is determinedSThe determination is performed as described above. Here, a monitoring level threshold OT1 is requiredSIs a ratio of a warning level threshold OT2SA small value. Then, at OC ≧ OT1SIf it is determined that corrosion has occurred in the semiconductive layer 14, the stator coil 10 needs to be repaired, and the process proceeds to step ST8, where the display unit 24 displays a "monitoring required level" (i.e., the stator coil needs to be repaired), and the degradation monitoring process is terminated. On the other hand, OC in step ST7<OT1SWhen the deterioration monitoring process is completed, the deterioration monitoring process is ended.
Next, the operation of the stator coil deterioration monitoring system 20 of the rotating equipment according to the first embodiment will be described with reference to fig. 3 to 7.
Here, fig. 6 shows, in experimental values, the relationship between the degree of erosion spread (change in erosion area) of the semiconductive layer 14 of the stator coil 10 due to the occurrence of surface discharge and the ozone concentration that changes according to the degree of erosion of the semiconductive layer 14.
In the present embodiment, in fig. 6, the concentration of ozone generated when the erosion area S1, which is the erosion in the initial stage of the semiconductive layer 14, is set to the required monitoring level threshold OT1 of the degradation monitoring process performed by the degradation monitoring unit 23 described aboveS. In fig. 6, the erosion area S2 of erosion in the middle stage as the semiconductive layer 14 (S2)>S1) is set as the alarm level threshold OT2 of the degradation monitoring processS. In fig. 6, the erosion area S3 (S3) is the erosion area at the final stage of the semiconductive layer 14>S2) is set as the immediate corresponding level threshold OT3 of the degradation monitoring processS。
The stator coil deterioration monitoring system 20 periodically measures the concentration of ozone and nitrogen oxide in the internal atmosphere gas of the rotary machine 1 using the concentration measuring unit 21. In this case, the extraction position of ozone and nitrogen oxide may be any position as long as it is a position at which the ozone absorption filter 28 and the ozone detection tube 29 of the concentration measurement unit 21 can directly extract the internal atmosphere gas, and any position may be selected, for example, a hole of a bolt penetrating the device frame 3 of the rotary device 1, a vent portion for air supply and exhaust, and the like.
When the first gas suction device 25 of the concentration measuring section 21 is driven, the internal ambient gas of the rotary apparatus 1 is sucked and passes through the ozone absorbing filter 28 and the nitrogen oxide detecting tube 27. Since ozone in the internal atmosphere gas passing through the ozone absorbing filter 28 is absorbed, only the internal atmosphere gas containing nitrogen oxides passes through the nitrogen oxide detecting tube 27, and the nitrogen oxide detecting tube 27 measures the concentration of nitrogen oxides with high accuracy. In addition, when the second gas suction means 26 is driven, the internal ambient gas of the rotary apparatus 1 is sucked and passed through the ozone detecting tube 29, and the ozone detecting tube 29 measures the concentration of ozone.
Fig. 7 shows changes in the concentration of ozone and nitrogen oxides generated inside the rotary machine 1 as the operating time of the rotary machine 1 elapses.
If the insulating layer 13 of the stator coil 10 of the rotating machine 1 deteriorates, partial discharge occurs in the minute voids, and if the deterioration progresses, the size and number of the minute voids increase, and the intensity and amount of the partial discharge increase. Since the partial discharge generated in the minute gap of the insulating layer 13 is blocked by the mica tape or the thermosetting resin forming the stator coil 10, the gas such as ozone or nitrogen oxide generated by the partial discharge does not leak into the internal environment of the rotary machine 1.
On the other hand, if the semiconductive layer 14 is degraded, the semiconductive layer 14 is eroded and disappears by surface discharge. When deterioration of the eroded and disappeared semiconductive layer is accelerated, the surface area of the eroded and disappeared semiconductive layer increases, and the amount of surface discharge increases. Cooling air flows on the surface of the stator coil 10, and circulates inside the rotating machine 1. Therefore, ozone and nitrogen oxides generated by surface discharge due to deterioration of the semiconductive layer 14 circulate in the internal environment of the rotary machine 1 with the cooling air.
As shown in fig. 7, when the semiconductive layer 14 is continuously eroded due to an increase in the operating time of the rotating equipment 1, ozone is gradually generated and the concentration gradually increases. However, the nitrogen oxide is generated in the erosion at the final stage of the semiconductive layer 14 and the concentration thereof increases rapidly.
In fig. 7, in the initial period of the operating time of the rotating machine 1, surface discharge does not occur in the semiconductive layer 14 of the stator coil 10, and the erosion does not spread.
Then, the operating time of the rotating equipment 1 increases, and surface discharge occurs in the semiconductive layer 14 of the stator coil 10, whereby the erosion in the initial stage spreads. At this time, the deterioration monitoring unit 23 determines that the ozone concentration OC is the threshold OT1 for monitoring based on the regular concentration measurement of ozone and nitrogen oxides by the concentration measuring unit 21SIn this case, it is considered necessary to repair the stator coil 10 and display the "monitoring required level" on the display unit 24 (steps ST7 and ST 8).
Further, the operating time of the rotating equipment 1 is further increased, and the surface discharge occurs in the semiconductive layer 14, whereby the erosion in the middle stage is expanded. At this time, deterioration monitoring unit 23 determines that ozone concentration OC is alarm level threshold OT2SIn this case, it is considered necessary to consider the replacement of the stator coil 10 and display the "alert level" on the display unit 24 (steps ST5 and ST 6).
When the operating time of the rotating machine 1 further increases and the semiconductive layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 determines that the ozone concentration OC is the immediate correspondence level threshold OT3SIn this case, the stator coil 10 is regarded as being required to be replaced, and the display unit 24 displays the "immediate correspondence level" (step ST4, step ST 3).
Here, when the semiconductive layer 14 reaches the erosion in the final stage, the deterioration monitoring unit 23 determines that the nitrogen oxide concentration NC is the immediate correspondence level threshold NTSIn this case, the stator coil 10 is regarded as being required to be replaced, and the display unit 24 displays the "immediate correspondence level" (step ST2, step ST 3).
[ Effect of stator coil degradation monitoring System ]
The effect of the stator coil deterioration monitoring system 20 of the rotating equipment of the first embodiment will be described.
First, the effect of the concentration measuring section 21 constituting the stator coil degradation monitoring system 20 will be described.
The concentration measuring unit 21 allows the ambient gas inside the rotary machine 1 to pass through the nitrogen oxide detection tube 27 and the ozone detection tube 29 by the suction operation of the first gas suction device 25 and the second gas suction device 26, and measures the concentration according to the degree of discoloration thereof, thereby simplifying the measurement.
Further, since the ozone absorbing filter 28 absorbs ozone before the internal atmosphere gas of the rotary machine 1 passes through the nitrogen oxide detection pipe 27, the concentration of nitrogen oxide can be accurately measured from the internal atmosphere gas without causing a problem such as the inside of the nitrogen oxide detection pipe 27 being discolored by the influence of ozone.
Next, the effect of the degradation monitoring process performed by the degradation monitoring unit 23 constituting the stator coil degradation monitoring system 20 will be described.
When the operating time of the rotating equipment 1 increases and the erosion of the semiconductive layer 14 in the initial stage expands, the deterioration monitoring unit 23 determines that the ozone concentration OC is the monitoring-required level threshold OT1SAs described above, it is considered necessary to repair the stator coil 10 and display the "monitoring required level" on the display unit 24. When the operating time of the rotating equipment 1 further increases and the erosion of the semiconductive layer 14 in the middle stage expands, the deterioration monitoring unit 23 determines that the ozone concentration OC is the alarm level threshold OT2SAs described above, it is considered necessary to consider the replacement of the stator coil 10 and display the "alert level" on the display unit 24. Then, when the operating time of the rotating equipment 1 further increases and the semiconductive layer 14 reaches the erosion at the final stage, the deterioration monitoring unit 23 determines that the ozone concentration OC is the immediate correspondence level threshold OT3SAs described above, it is considered that the stator coil 10 needs to be replaced, and the display unit 24 displays the "instantaneous correspondence level". When the semiconductor layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 determines that the semiconductor layer is nitrogen oxideThe concentration NC of the compound is the threshold NT of the instantaneous corresponding levelSIn the above case, it is considered that the stator coil 10 needs to be replaced, and the "instantaneous correspondence level" is displayed on the display unit 24.
Therefore, the stator coil degradation monitoring system 20 according to the first embodiment can continuously monitor degradation of the semiconductive layer 14 without stopping the rotary machine 1 as in the conventional visual inspection, and thus can continuously and stably operate the rotary machine 1.
Although the stator coil deterioration monitoring system 20 of the rotary machine according to the first embodiment measures the concentrations of ozone and nitrogen oxides to monitor the replacement timing of the stator coil 10, even if the stator coil 10 is monitored by measuring only the concentration of ozone or the stator coil 10 is monitored by measuring only the concentration of nitrogen oxides, deterioration of the semiconductive layer 14 can be continuously monitored without stopping the rotary machine 1, and the rotary machine 1 can be continuously and stably operated.
Further, although the ozone probe tube 29 for measuring the concentration according to the degree of discoloration by passing the internal atmosphere gas of the rotary device 1 is used in the concentration measuring unit 21 of the first embodiment, the same effect can be obtained by using an ozone monitor, an infrared spectrometer, or the like.
The operation of the deterioration monitoring unit according to the present invention to notify that the life of the stator coil is exhausted is performed such that the "monitoring required level", "warning level", and "immediate correspondence level" are displayed on the display unit 24 of the arithmetic processing device such as a microcomputer in the deterioration monitoring process performed by the deterioration monitoring unit 23 according to the first embodiment, but the present invention is not limited thereto. For example, the same effect can be obtained even by a method in which an operator visually confirms the ozone concentration measurement value OC and the nitrogen oxide concentration measurement value NC and notifies the state of erosion of the semiconductive layer 14 in writing.
[ Structure of concentration measuring portion ]
Next, fig. 8 to 10 show a specific configuration of the concentration measuring section 21.
Fig. 8 shows an apparatus for detecting nitrogen oxides, and a gas extraction pipe 30 is inserted into a gas extraction hole 3c formed in the equipment frame 3 of the rotary equipment 1 and communicating the inside and outside of the rotary equipment 1. The gas extraction pipe 30 is made of a metal material such as stainless steel that can prevent corrosion due to contact with ozone, and penetrates through the silicon plug 31. By fitting the plug 31 into the gas extraction hole 3c, the gas extraction pipe 30 is disposed so as to extend inside and outside the rotary machine 1.
One end of an extension pipe 33 is connected to one end of the gas extraction pipe 30 on the outer side thereof via a connection pipe 32. These connection pipe 32 and extension pipe 33 are flexible pipes made of a synthetic resin material such as teflon (registered trademark) which can prevent corrosion by contact with ozone.
One end of the ozone absorbing filter 28 is connected to the other end of the extension pipe 33, and one end of the nitrogen oxide detecting pipe 27 is connected to the other end of the ozone absorbing filter 28. Further, a first gas suction device 25 is connected to the other end of the nitrogen oxide detection pipe 27.
The ozone absorbing filter 28 is a hollow tube having a gas inlet and a gas outlet provided at both ends in the longitudinal direction, and a large amount of granular aluminum AL shown in fig. 9 is contained in the hollow tube. Here, the hollow tube shape of the ozone absorbing filter 28 has a length direction dimension L of 160mm as shown in fig. 8 and an inner diameter dimension D of 19mm as shown in fig. 9. The granular aluminum AL contained therein is set to a size of about 2mm to 5 mm. Thus, the internal ambient gas sucked out from the inside of the rotary machine 1 through the gas extraction pipe 30 passes through the ozone absorbing filter 28 from the gas intake port, and the contact area between the aluminum AL set to a size of about 2mm to 5mm and the internal ambient gas is increased, whereby the ozone contained in the internal ambient gas is absorbed or decomposed. The aluminum AL contained in the ozone absorbing filter 28 may be formed into a granular shape having a size of about 2mm to 5mm or a scaly shape having a side of about 5mm to 10 mm. The material contained in the ozone absorbing filter 28 is not limited to aluminum AL, and may be a material having a property of absorbing or decomposing ozone, such as iron.
In addition, the first gas suction device 25 is adjusted to suck the internal ambient gas of the rotary apparatus 1 at a flow rate of 50ml/min and an integrated flow rate of 100ml, so that the degree of discoloration of the nitrogen oxide detection tube 27 can be accurately displayed. Thus, the first gas suction device 25 sucks the internal atmosphere gas at an optimum flow rate and an integrated flow rate, and thus can detect the concentration of nitrogen oxides with high accuracy.
In addition, fig. 10 shows an apparatus for detecting ozone, wherein a plug 31 is fitted into a gas extraction hole 3c formed in an equipment frame 3 of a rotary equipment 1, a gas extraction pipe 30 is disposed to extend inside and outside the rotary equipment 1, and one end of an extension pipe 33 is connected to one end of the outside of the gas extraction pipe 30 via a connection pipe 32. One end of the ozone probe tube 29 is connected to the other end of the extension tube 33, and the second gas suction device 26 is connected to the other end of the ozone probe tube 29.
The second gas suction means 26 is adjusted to suck the internal ambient gas of the rotary apparatus 1 at a flow rate of 100ml/min and an integrated flow rate of 1000ml, so that the degree of discoloration of the ozone detecting tube 29 can be accurately displayed. Thus, the second gas suction device 26 sucks the internal atmosphere gas at the optimum flow rate and the integrated flow rate, and therefore, the concentration of ozone can be detected with high accuracy.
[ Effect of the concentration measuring part ]
Next, the effect of the concentration measuring section 21 will be described.
The first gas suction device 25 is adjusted to suck the internal atmosphere of the rotary machine 1 at a flow rate and an integrated flow rate such that the degree of discoloration of the nitrogen oxide detection tube 27 can be accurately displayed, and therefore the concentration of nitrogen oxide can be detected with high accuracy.
Further, the second gas suction device 26 is adjusted to suck the internal atmosphere gas of the rotary machine 1 at a flow rate and an integrated flow rate such that the degree of discoloration of the ozone detecting tube 29 can be accurately displayed, and therefore the concentration of ozone can be detected with high accuracy.
The gas extraction tube 30 is made of a metal material such as stainless steel that can prevent corrosion due to contact with ozone, and the connection tube 32 and the extension tube 33 are also made of a synthetic resin material such as teflon (registered trademark) that can prevent corrosion due to contact with ozone, so that the concentration measurement unit 21 can be used for a long period of time.
Further, since the ozone absorbing filter 28 contains an ozone absorbing material such as aluminum AL or iron formed in a granular shape having a size of about 2 to 5mm, a pill shape, or a scale shape having a side of about 5 to 10mm in a hollow tube having a gas inlet and a gas outlet provided at both ends in the longitudinal direction, a high effect of absorbing and decomposing ozone can be expected by increasing the contact area between the internal atmosphere gas passing through the hollow tube and the ozone absorbing material.
Claims (22)
1. A gas detection device for a rotating machine, which measures a concentration of nitrogen oxides generated from a stator coil of the rotating machine, the gas detection device for the rotating machine comprising:
a nitrogen oxide suction device that sucks an internal atmosphere of the rotary equipment; and a nitrogen oxide concentration detection unit connected between the rotary machine and the nitrogen oxide suction device, the nitrogen oxide concentration detection unit detecting a concentration of nitrogen oxide contained in the internal ambient gas when the internal ambient gas passes through the nitrogen oxide concentration detection unit,
an ozone absorbing filter for absorbing ozone in the internal atmosphere gas passing through the inside of the ozone absorbing filter is connected between the nitrogen oxide concentration detection unit and the rotary device.
2. The gas detection apparatus of a rotary device according to claim 1,
the gas detection device is a gas detection device that measures concentrations of ozone and the nitrogen oxides generated from the stator coil,
the gas detection device for a rotary machine further includes: a suction device for ozone that sucks an internal atmosphere of the rotary apparatus; and an ozone concentration detection unit connected between the rotary machine and the ozone suction device, the ozone concentration detection unit detecting a concentration of ozone contained in the internal ambient gas when the internal ambient gas passes through the ozone concentration detection unit.
3. The gas detection apparatus of a rotary device according to claim 1 or 2,
the nitrogen oxide concentration detection part is a nitrogen oxide detection tube as follows: a sealed tubular container contains a chemical agent, the chemical agent reacts with the nitrogen oxide and changes color when the internal ambient gas passes through the nitrogen oxide detection tube, and the concentration of the nitrogen oxide is measured according to the degree of the color change of the chemical agent.
4. The gas detection apparatus of a rotary device according to claim 2,
the ozone concentration detection part is an ozone detection tube as follows: a chemical is contained in a sealed tubular container, the chemical reacts with the ozone by the internal atmosphere gas passing through the ozone detection tube and changes color, and the ozone concentration is measured according to the degree of the color change of the chemical.
5. The gas detection apparatus of a rotary device according to any one of claims 1 to 4,
the nitrogen oxide suction device is capable of adjusting the flow rate of the internal ambient gas so that the internal ambient gas is sucked at a flow rate suitable for the nitrogen oxide concentration detection unit to detect the concentration of nitrogen oxide.
6. The gas detection apparatus of a rotary device according to claim 5,
the nitrogen oxide suction device is capable of adjusting the cumulative flow rate of the internal ambient gas so that the internal ambient gas is sucked at a cumulative flow rate suitable for the nitrogen oxide concentration detection unit to detect the concentration of nitrogen oxide.
7. The gas detection apparatus of a rotary device according to claim 2,
the ozone suction device can adjust the flow rate of the internal atmosphere gas so that the internal atmosphere gas is sucked at a flow rate suitable for the concentration of ozone detected by the ozone concentration detection unit.
8. The gas detecting apparatus of a rotary device according to claim 7,
the ozone suction device can adjust the cumulative flow rate of the internal atmosphere gas so that the internal atmosphere gas is sucked at a cumulative flow rate suitable for the concentration of ozone detected by the ozone concentration detection unit.
9. The gas detection apparatus of a rotary device according to any one of claims 1 to 8,
a gas detection device for measuring the concentration of nitrogen oxides includes: a gas extraction pipe inserted into a gas extraction hole provided in the rotating device; and an extension pipe having flexibility and connected to one end of the gas extraction pipe located outside the rotary device and the ozone absorbing filter.
10. The gas detection apparatus of a rotary device according to claim 9,
the gas extraction tube is formed of a metal material capable of preventing corrosion due to contact with ozone.
11. The gas detection apparatus of a rotary device according to claim 9 or 10,
the extension pipe is formed of a synthetic resin material capable of preventing corrosion due to contact with ozone.
12. The gas detection apparatus of a rotary device according to any one of claims 1 to 11,
the ozone absorption filter is provided with: a hollow tube having a gas inlet and a gas outlet formed at both ends in a longitudinal direction; and a mass of ozone absorbing material contained within the hollow tube.
13. The gas detecting apparatus of a rotary device according to claim 12,
the ozone absorbing material has a granular shape having a size of 2mm to 5mm or a scaly shape having one side of 5mm to 10 mm.
14. The gas detection apparatus of a rotary device according to claim 2,
a gas detection device for measuring the concentration of ozone is provided with: a gas extraction pipe inserted into a gas extraction hole provided in the rotating device; and an extension pipe having flexibility and connected to one end of the gas extraction pipe located outside the rotary device and the ozone concentration detection unit.
15. The gas detecting apparatus of a rotary device according to claim 14,
the gas extraction tube is formed of a metal material capable of preventing corrosion due to contact with ozone.
16. The gas detection apparatus of a rotary device according to claim 14 or 15,
the extension pipe is formed of a synthetic resin material capable of preventing corrosion due to contact with ozone.
17. A gas detection method for a rotary machine for measuring concentrations of ozone and nitrogen oxides generated from a stator coil of the rotary machine, the gas detection method for a rotary machine being characterized in that,
connecting an ozone concentration detection portion to the rotary device, the ozone concentration detection portion detecting a concentration of ozone contained in an internal ambient gas of the rotary device by passing the internal ambient gas through the ozone concentration detection portion,
a nitrogen oxide concentration detection unit that is connected to the rotary machine and that detects a concentration of nitrogen oxide contained in an internal ambient gas of the rotary machine by passing the internal ambient gas through the nitrogen oxide concentration detection unit,
an ozone absorbing filter for absorbing ozone in the internal atmosphere gas passing through the inside of the ozone absorbing filter is connected between the nitrogen oxide concentration detection unit and the rotary device.
18. The gas detection method of a rotary apparatus according to claim 17,
when the internal ambient gas of the rotary equipment is caused to pass through the nitrogen oxide concentration detection section, the internal ambient gas is sucked at a flow rate suitable for the nitrogen oxide concentration detection section to detect the concentration of nitrogen oxide.
19. The gas detection method of a rotary apparatus according to claim 18,
when the internal ambient gas of the rotary machine is caused to pass through the nitrogen oxide concentration detection unit, the internal ambient gas is sucked at an integrated flow rate suitable for the nitrogen oxide concentration detection unit to detect the concentration of nitrogen oxide.
20. The gas detection method of a rotary apparatus according to any one of claims 17 to 19,
when the internal ambient gas of the rotary apparatus is caused to pass through the ozone concentration detection section, the internal ambient gas is sucked at a flow rate suitable for the ozone concentration detection section to detect the concentration of ozone.
21. The gas detection method of a rotary apparatus according to claim 20,
when the internal ambient gas of the rotary device is caused to pass through the ozone concentration detection section, the internal ambient gas is sucked at an integrated flow rate suitable for the ozone concentration detection section to detect the concentration of ozone.
22. A stator coil degradation monitoring system in a rotating device, comprising:
a gas detection device of a rotary apparatus according to claim 2; and
and a deterioration monitoring unit that determines a degree of erosion spread of a semiconductive layer constituting the stator coil based on a concentration of ozone detected by the gas detecting device, notifies a state of the stator coil when it is determined that erosion is spread and deterioration of the semiconductive layer occurs, determines the degree of erosion spread of the semiconductive layer based on a concentration of nitrogen oxide detected by the gas detecting device, and notifies that a life of the stator coil is exhausted.
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