TWI760757B - Gas detection device for rotating machine, gas detection method, and stator coil deterioration monitoring system - Google Patents

Abstract

A gas detection device (21) for measuring the concentration of nitrogen oxides generated from a stator coil (7) of a rotating machine (1). It is provided with: a suction device (25) for nitrogen oxides, which sucks the internal ambient gas of the rotating machine; and a nitrogen oxide concentration detection part (27), which is connected between the rotating machine and the suction device for nitrogen oxides, so as to The concentration of nitrogen oxides contained in the internal ambient gas is detected by means of the internal ambient gas; wherein, between the nitrogen oxide concentration detection unit and the rotating machine, an ozone absorption filter for absorbing ozone from the internal ambient gas passing through is connected. device (28).

Description

Gas detection device for rotating machine, gas detection method, and stator coil deterioration monitoring system

The present invention relates to a gas detection device, a gas detection method, and a stator coil deterioration monitoring system for a rotating machine used for monitoring deterioration of a semiconductive layer of a stator coil of a rotating machine such as a high-voltage rotating machine.

A stator coil of a rotating machine such as a high-voltage rotating machine is provided with a wire coil in which a plurality of conductors with an insulating coating are bundled, an insulating layer provided by winding the wire coil with mica tape, and a semiconductive layer; the stator coil is It is accommodated in the slot of the stator core and wired, and these are impregnated and hardened with thermosetting resin. The stator coil is subjected to electrical, thermal, and mechanical stress during operation, and the insulating layer and the semiconducting layer are likely to deteriorate over time. Deterioration of the insulating layer of the stator coil is caused by partial discharge generated in minute pores in the insulating layer, which is eroded over time, and then suddenly causes a machine failure (insulation breakdown). Here, a partial discharge monitoring technology that detects the occurrence level of partial discharge of an operating rotating machine and prompts maintenance or update before failure is continuously developed (for example, Patent Documents 1 and 2).

Patent Document 1 is a technology for detecting the deterioration of the insulating layer of the rotor coil by measuring the concentrations of carbon monoxide, nitrogen dioxide, and ozone from the internal ambient gas of the rotating machine, and analyzing the measurement results, and performing preventive maintenance of the rotating machine. . Patent Document 2 measures the ozone from the relationship between the partial discharge charge and the ozone generation concentration, thereby detecting the generation status of the partial discharge generated in the coil of the rotating machine without being affected by the high frequency noise, and monitoring the rotor coil. The method of degradation of the insulating layer.

On the other hand, the semiconducting layer of the stator coil is degraded due to partial discharge caused by minute pores between the insulating layer and the semiconducting layer. When the semiconducting layer is degraded, partial discharge occurs and the degradation of the semiconducting layer is accelerated. Here, partial discharge occurs under the entire insulating layer including the stator coil and the semiconductive layer, but in this case, the discharge generated on the surface of the stator coil with the deterioration of the semiconductive layer is called "surface discharge". Since the surface discharge generated in the semiconductive layer promotes the deterioration, corrosive gases such as ozone (O3) and nitrogen oxides (NO, NO2) are generated at this time, and the corrosive gases combine with moisture in the air to generate nitric acid. As a result, the strength reduction due to rust or corrosion of the metal structural parts of the rotating machine is caused, and secondary failures are caused, and the stable operation of the rotating machine may be hindered.

The degradation of the semiconductive layer is caused by surface discharge, and the tendency of degradation can be detected by the partial discharge test conducted in the past. However, when the partial discharge generated in the insulating layer is dominant, it can be determined. Deterioration of the semiconducting layer is difficult. For this reason, the evaluation of the deterioration of the semiconductive layer is mainly based on the method of stopping the operation of the rotating machine, pulling out the rotor, and inspecting the stator coil by visual inspection. In order to check the deterioration of the semiconducting layer, it is necessary to remove the frame of the rotating machine, pull out the rotor, and visually check the state of the stator coil. However, since high-voltage rotating equipment is the main equipment in a power plant or a factory, the evaluation of the deterioration of the semiconductive layer due to the stoppage of operation is not expected in the operation of the factory. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2012-503463 [Patent Document 2] Japanese Patent Laid-Open No. 2018-200179

[The problem to be solved by the invention]

The techniques of the aforementioned Patent Documents 1 and 2 are techniques for monitoring the deterioration or partial discharge of the insulators of the rotor coils of rotating machines, and methods for evaluating the deterioration of the semiconducting layers of the stator coils by methods other than visual inspection are not yet available. established. Therefore, the technique of monitoring the deterioration of the semiconducting layer of the stator coil is important in the stable operation of the rotating machine. As in the conventional visual inspection, the rotating machine is not stopped but the rotating machine is running (on-line). A method for evaluating the deterioration of the semiconducting layer of the stator coil is necessary.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a gas detection device, a gas detection method, and a stator coil deterioration monitoring system for a rotating machine, which monitor a semiconductive layer of a stator coil of a rotating machine. The stable operation of the rotating machine can be continued in the manner of deterioration. [Means of Solving Problems]

In order to achieve the above object, a gas detection device for a rotary machine according to one aspect of the present invention is a gas detection device for measuring the concentration of nitrogen oxides generated from a stator coil of a rotary machine, and includes: a suction device for nitrogen oxides , which sucks the internal ambient gas of the rotating machine; and a nitrogen oxide concentration detection unit, which is connected between the rotating machine and the nitrogen oxide suction device, to detect the amount contained in the internal ambient gas by means of the internal ambient gas The concentration of nitrogen oxides; wherein, between the nitrogen oxide concentration detection unit and the rotating machine, an ozone absorption filter that absorbs ozone from the internal ambient gas passing through is connected.

Furthermore, a gas detection method for a rotary machine according to one aspect of the present invention is a gas detection method for measuring the concentrations of ozone and nitrogen oxides generated from a stator coil of a rotary machine, wherein an 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 in such a way that the internal ambient gas of the rotating machine passes through the ozone concentration detection unit; The nitrogen oxide concentration detection unit detects the concentration of nitrogen oxides contained in the internal ambient gas by means of a nitrogen oxide concentration detection unit; between the nitrogen oxide concentration detection unit and the rotating machine, the above-mentioned internal passage from the inside is connected. Ozone absorbing filter for absorbing ozone from ambient gas.

Furthermore, a stator coil deterioration monitoring system in a rotating machine according to one aspect of the present invention includes: a gas detection device, and a deterioration monitoring unit; wherein the gas detection device includes: a suction device for nitrogen oxides, which suctions the rotating machine The nitrogen oxide concentration detection part is connected between the rotating machine and the suction device for nitrogen oxides, and detects the concentration of nitrogen oxides contained in the internal environment gas by means of the internal ambient gas; ozone an absorption filter, which is connected between the nitrogen oxide concentration detection unit and the rotating machine, and absorbs ozone from the internal ambient gas passing through the inside; an ozone suction device that sucks the internal ambient gas of the rotating machine; and the ozone concentration detection unit , which is connected between the rotating machine and the aforementioned ozone suction device to detect the concentration of ozone contained in the internal ambient gas by passing through the aforementioned internal ambient gas; wherein, the deterioration monitoring unit is detected by a gas detection device according to the The concentration of the obtained ozone (or nitrogen oxides, or both ozone and nitrogen oxides) is used to determine the degree of progress of the erosion of the semiconductive layer, and when it is judged that the erosion progresses to the extent that the semiconductive layer is degraded, the state of the stator coil is reported. [Inventive effect]

According to the gas detection device, the gas detection method, and the stator coil deterioration monitoring system for a rotary machine according to the present invention, it is possible to monitor the deterioration of the semiconductive layer of the stator coil of the rotary machine to continue stable operation of the rotary machine.

Next, referring to the drawings, a first embodiment of the present invention will be described. In the description of the following drawings, the same or similar reference numerals are assigned to the same or similar parts. However, the drawings are schematic representations, and it should be noted that the relationship between the thickness and the plane size, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, the specific thickness or size should be judged with reference to the following description. In addition, it is needless to say that parts having different dimensional relationships and ratios may be included between the drawings. In addition, the first embodiment shown below is an example of a device or method for embodying the technical idea of the present invention, and the technical idea of the present invention is not specific to the material, shape, structure, arrangement, etc. of the following components . The technical idea of the present invention is within the technical scope defined by the claims described in the scope of claims, and various modifications can be added.

[Construction of Rotary Machine] FIG. 1 shows a rotary machine 1 used in the first embodiment of the present invention. The rotary machine 1 includes a machine body 2 and a machine frame 3 covering the outer periphery of the machine body 2 . The machine body 2 is constituted by a rotor 4 and a stator 5 . The rotor 4 includes a rotating shaft 6 rotatably supported by end plates 3 a and 3 b formed on both ends of the machine 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 circumference of the rotor coil 7 with a predetermined gap interposed therebetween, and a stator coil formed on the inner circumference of the stator core 8 and accommodated in a plurality of slots 9 10. FIG. 2 is a diagram showing the stator coil 10 accommodated in the slot 9 of the stator core 8 . The stator coil 10 includes a wire coil 12 in which a plurality of conductive wires 11 with insulating coatings are bundled, an insulating layer 13 wound around the outer periphery of the wire coil 12 with mica tape or the like, and a thermosetting resin impregnated into the insulating layer. The semiconducting layer 14 is arranged around and hardened. These are accommodated in the groove 9 with the wedge 15, wired, and impregnated and hardened with a thermosetting resin. Electric power is supplied to the stator coil 10 from a three-phase cable (not shown).

[Stator Coil Deterioration Monitoring System of Rotating Machine] FIG. 3 shows a stator coil degradation monitoring system 20 of the rotating machine 1 according to the first embodiment. The stator coil deterioration monitoring system 20 includes a concentration measuring unit serving as a gas detection device for measuring the concentrations of ozone (O ₃ ) and nitrogen oxides (NO, NO ₂ ) generated by surface discharge due to the deterioration of the semiconducting layer 14 21. A measurement data recording unit 22 for recording measurement data of ozone and nitrogen oxides measured by the concentration measurement unit 21 , and a deterioration monitoring unit for monitoring the deterioration of the stator coil 10 based on the measurement data recorded by the measurement data recording unit 22 23 , and a display unit 24 for displaying the monitoring level of the rotary machine 1 in the deterioration monitoring unit 23 .

As shown in FIG. 4 , the concentration measuring unit 21 includes a first gas suction device 25 and a second gas suction device 26 , a nitrogen oxide detection tube 27 connected between the first gas suction device 25 and the rotating machine 1 , and a nitrogen oxide detection tube 27 connected to the rotating machine 1 . The ozone absorption filter 28 between the nitrogen oxide detection tube 27 and the rotary machine 1 , and the ozone detection tube 29 connected between the second gas suction device 26 and the rotary machine 1 . The ozone detection tube 29 is a sealed tubular container, and contains a chemical that reacts with ozone gas to change color, reacts with ozone contained in the internal ambient gas of the rotary machine 1 to change color, and measures the concentration of ozone based on the degree of the color change. . The nitrogen oxide detection tube 27 is in a sealed tubular container, and contains a chemical that reacts with nitrogen oxides to change color, and reacts with nitrogen oxides contained in the internal ambient gas of the rotary machine 1 to change color, depending on the degree of the color change. to determine the concentration of nitrogen oxides. The ozone absorbing filter 28 is contained in a sealed tubular container, and a material having a property of absorbing or decomposing ozone, such as iron or aluminum, is accommodated.

Next, the operation of the concentration measuring unit 21 will be described. When the first gas suction device 25 is driven, the internal ambient gas of the rotary machine 1 is sucked, and the gas passing through the ozone absorption filter 28 and the nitrogen oxide detection tube 27 is discharged from the first gas suction device 25 to the outside. At this time, the first gas suction device 25 adjusts the optimal flow rate and integrated flow rate for the internal ambient gas passing through the nitrogen oxide detection tube 27, and can detect the concentration of nitrogen oxides (NO, NO2) with high accuracy. Then, ozone is absorbed from the internal ambient gas passing through the ozone absorption filter 28 , the internal ambient gas containing only nitrogen oxides passes through the nitrogen oxide detection tube 27 , and the degree of discoloration of the nitrogen oxide detection tube 27 is used to measure the amount of nitrogen oxides. concentration. Then, when the second gas suction device 26 is driven, the internal ambient gas of the rotary machine 1 is sucked, passes through the ozone detection tube 29 , and the gas passing through the ozone detection 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 internal ambient gas passing through the ozone detection tube 29 to an optimum flow rate and an integrated flow rate, so that the concentration of ozone can be detected with high accuracy, and the degree of discoloration of the ozone detection tube 29 can be determined according to the degree of discoloration of the ozone detection tube 29. Determine the concentration of ozone.

Next, the concentration of ozone (measured ozone concentration value) OC measured by the ozone detection tube 29 of the concentration measuring unit 21 and the concentration of nitrogen oxides (measured value of nitrogen oxide concentration) measured by the nitrogen oxide detection tube 27 NC is 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 performs the corrosion progress of the semiconductive layer 14 of the stator coil 10, Judgments of life. The deterioration monitoring unit 23 includes a case where it is constituted by an arithmetic processing device such as a microcomputer, or a case where an operator manually performs measurement and a part of data processing. Referring to FIG. 2 , the degradation monitoring process performed by the degradation monitoring unit 23 will be described.

[Deterioration monitoring processing by the deterioration monitoring unit] In this deterioration 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 ST2. In step ST2, the degree of erosion of the semiconductive layer 14 of the stator coil 10 is determined based on the concentration of oxynitride. This determination is based on whether or not the nitrogen oxide concentration measurement value NC is equal to or greater than the immediate response level threshold value NTS. Next, when NC≧NTS, it is determined that the erosion of the semiconductive layer 14 has progressed to the extent that the stator coil 10 must be replaced, and the process proceeds to step ST3, and the gist of "replacement of the stator coil is necessary" is displayed on the display unit 24, and then The deterioration monitoring process ends. On the other hand, in step ST2, when NC<NTS, it transfers to step ST4. 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. This determination is based on whether or not the ozone concentration measurement value OC is equal to or greater than the immediate response level threshold value OT3S. Next, when OC≧OT3S, it is determined that the erosion of the semiconductive layer 14 has progressed to the extent that the stator coil 10 must be replaced, and the process proceeds to step ST3, and the gist of "replacement of the stator coil is necessary" is displayed on the display unit 24, and then The deterioration monitoring process ends. On the other hand, in step ST4, when OC<OT3S, it transfers to step ST5.

Also in step ST5, the degree of erosion of the semiconductive layer 14 of the stator coil 10 is determined based on the concentration of ozone. This determination is based on whether or not the ozone concentration measurement value OC is equal to or greater than the warning level threshold value OT2S. Here, the warning level threshold OT2S is a value smaller than the immediate response level threshold OT3S. Next, when OC≧OT2S, the erosion of the semiconducting layer 14 gradually progresses, so it is judged that the review of the replacement of the stator coil 10 is necessary, and the process goes to step ST3, and the "warning level (the review of the replacement of the stator coil is necessary) is set. "" is displayed on the display unit 24, and the deterioration monitoring process ends. On the other hand, in step ST5, when OC<OT2S, the process proceeds to step ST7. Also in step ST7, the degree of erosion of the semiconductive layer 14 of the stator coil 10 is determined based on the concentration of ozone. This determination is based on whether or not the ozone concentration measurement value OC is equal to or greater than the monitoring-required level threshold OT1S. Here, the required monitoring level threshold OT1S is a value smaller than the warning level threshold OT2S. Next, when OC≧OT1S, since the semiconductive layer 14 is corroding, it is judged that the repair of the stator coil 10 is necessary, and the process goes to step ST8, and the gist of "Monitoring level is required (repair inspection of stator coil exchange is necessary" is displayed. After reaching the display unit 24, the deterioration monitoring process is terminated. On the other hand, in step ST5, when OC<OT1S, the deterioration monitoring process is terminated.

Next, the operation of the stator coil deterioration monitoring system 20 of the rotary machine according to the first embodiment will be described with reference to FIGS. 3 to 7 . Here, FIG. 6 shows the difference between the degree of progress of the erosion of the semiconductive layer 14 of the stator coil 10 due to the generation of surface discharge (change in the erosion area) and the change of the ozone concentration due to the degree of erosion of the semiconductive layer 14 by experimental values. Diagram of the relationship. In this embodiment, in FIG. 6 , the ozone concentration generated in the initial stage of the erosion of the semiconductive layer 14, that is, the erosion of the area S1, is used as a required monitoring position for the degradation monitoring process performed by the above-mentioned degradation monitoring unit 23. Quasi-threshold OT1S. In addition, in FIG. 5 , the ozone concentration generated in the middle stage of the erosion of the semiconductive layer 14 , that is, when the erosion area S2 ( S2 > S1 ), is used as the warning level threshold OT2S for the deterioration monitoring process. Furthermore, in FIG. 5 , the ozone concentration generated when the semiconducting layer 14 is eroded in the final stage, that is, the erosion area S3 (S3>S2), is used as the immediate response level OT3S of the deterioration monitoring process.

The stator coil deterioration monitoring system 20 periodically uses the concentration measuring unit 21 to measure the concentrations of ozone and nitrogen oxides in the internal ambient gas of the rotating machine 1 . At this time, the collection position of ozone and nitrogen oxides can be selected as long as it is a place where the internal ambient gas can be directly collected, such as a hole passing through a bolt of the machine frame 3 of the rotary machine 1 or a vent portion for air supply and exhaust. The ozone absorption filter 28 and the ozone detection tube 29 of the concentration measuring unit 21 are installed in arbitrary places. When the first gas suction device 25 of the concentration measuring unit 21 is driven, the internal ambient gas of the rotary machine 1 is sucked, and the gas passes through the ozone absorption filter 28 and the nitrogen oxide detection tube 27 . Since ozone is absorbed from the internal ambient gas passing through the ozone absorption filter 28, only the internal ambient gas containing nitrogen oxides passes through the nitrogen oxide detection tube 27, and the nitrogen oxide detection tube 27 measures the concentration of nitrogen oxides with high accuracy. Then, when the second gas suction device 26 is driven, the internal ambient gas of the rotary machine 1 is sucked and passed through the ozone detection tube 29, and the ozone detection tube 29 measures the concentration of ozone.

FIG. 7 is a graph showing the elapse of the operation time of the rotary machine 1 and the changes in the concentrations of ozone and nitrogen oxides generated inside the rotary machine 1 . Under the deterioration of the insulating layer 13 of the stator coil 10 of the rotary machine 1, partial discharges are generated in minute pores. As the deterioration progresses, the size or number of the minute pores increases, and the intensity or generation of the partial discharges increases. The partial discharge generated in the tiny pores of the insulating layer 13 is sealed by the mica tape or thermosetting resin forming the stator coil 10, and the ozone or nitrogen oxide gas generated by the partial discharge does not leak into the rotor. Internal ambient gas of machine 1. On the other hand, when the semiconductive layer 14 is degraded, the semiconductive layer 14 is eroded and disappeared due to surface discharge. When the deterioration of the semiconducting layer that has been eroded and disappeared by discharge progresses, the surface area of the semiconducting layer that has been eroded and disappeared increases, and the generation amount of surface discharge increases. On the surface of the stator coil 10 , cooling air flows, and the cooling air circulates inside the rotating machine 1 . For this reason, ozone or nitrogen oxides generated by surface discharge due to the deterioration of the semiconducting layer 14 are circulated in the internal ambient air of the rotating machine 1 by the cooling wind.

As shown in FIG. 7 , when the semiconductive layer 14 is further eroded due to the increase in the operating time of the rotary machine 1 , ozone is gradually generated and the concentration increases. However, the oxynitride is generated due to the erosion of the semiconducting layer 14 in the final stage, and the concentration increases rapidly. In FIG. 7 , at the beginning of the operation time of the rotary machine 1, no surface discharge is generated in the semiconductive layer 14 of the stator coil 10, and the erosion has not progressed. Next, the operation time of the rotary machine 1 increases, and surface discharge occurs in the semiconductive layer 14 of the stator coil 10 to progress the initial stage of erosion. At this time, if the deterioration monitoring unit 23 determines that the ozone concentration OC is equal to or greater than the required monitoring level threshold value OT1S based on the periodic concentration measurement of ozone and nitrogen oxides by the concentration measuring unit 21 , a repair review for the replacement of the stator coil 10 is necessary. , and "monitoring level required" is displayed on the display unit 24 (step ST7, step ST8).

Furthermore, the operation time of the rotary machine 1 is further increased because of the generation of the surface discharge of the semiconductive layer 14, which progresses to the middle stage of erosion. At this time, the deterioration monitoring unit 23 judges that the ozone concentration OC is equal to or greater than the warning level threshold value OT2S, and then the review of the replacement of the stator coil 10 is necessary, and displays "warning level" on the display unit 24 (steps ST5 and ST6 ). ). Next, when the operation time of the rotary machine 1 is further increased and the semiconductive layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 determines that the ozone concentration OC is equal to or higher than the immediate response level threshold value OT3S, and the stator coil 10 needs to be replaced. , and "immediate response level" is displayed on the display unit 24 (step ST4, step ST3). Here, when the semiconducting layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 judges that the nitrogen oxide concentration NC is equal to or higher than the immediate response level threshold value NTS, that is, the replacement of the stator coil 10 is necessary, and displays it on the display unit 24 "Immediate response level" is displayed in the display (step ST2, step ST3).

[Effect of the stator coil deterioration monitoring system] The effect of the stator coil deterioration monitoring system 20 of the rotary machine according to the first embodiment will be described. First, the effects of the concentration measuring unit 21 constituting the stator coil deterioration monitoring system 20 will be described. The concentration measuring unit 21 uses the suction operation of the first gas suction device 25 and the second gas suction device 26 to pass the internal ambient gas of the rotary machine 1 to the nitrogen oxide detection tube 27 and the ozone detection tube 29, and the degree of discoloration of these is measured. To measure the concentration, it is possible to simplify the measurement. Next, since the ozone absorption filter 28 absorbs ozone before the internal ambient gas of the rotary machine 1 passes through the nitrogen oxide detection tube 27, there will be no problems such as discoloration of the inside of the nitrogen oxide detection tube 27 due to the influence of ozone. The nitrogen oxide concentration can be accurately measured from the internal ambient gas.

Next, the effect of the deterioration monitoring process performed by the deterioration monitoring unit 23 constituting the stator coil deterioration monitoring system 20 will be described. If the operation time of the rotary machine 1 increases and the erosion of the semiconductive layer 14 progresses in the initial stage, the deterioration monitoring unit 23 determines that the ozone concentration OC is equal to or higher than the monitoring level threshold value OT1S or more, and the repair and inspection of the replacement of the stator coil 10 is necessary. , and "Monitoring level required" is displayed on the display unit 24 . In addition, when the operation time of the rotary machine 1 is further increased and the erosion of the semiconductive layer 14 progresses in the intermediate stage, the deterioration monitoring unit 23 determines that the ozone concentration OC is equal to or higher than the warning level threshold value OT2S, and the replacement of the stator coil 10 is checked. If necessary, "warning level" is displayed on the display unit 24 . Next, when the operation time of the rotary machine 1 is further increased and the semiconductive layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 determines that the ozone concentration OC is equal to or higher than the immediate response level threshold value OT3S, and the stator coil 10 needs to be replaced. , and "immediate response level" is displayed on the display unit 24 . Furthermore, when the semiconducting layer 14 reaches the final stage of erosion, the deterioration monitoring unit 23 determines that the nitrogen oxide concentration NC is equal to or higher than the immediate response level threshold value NTS. "Respond to level immediately" is displayed in the display. Therefore, the stator coil deterioration monitoring system 20 of the first embodiment can continuously monitor the deterioration of the semiconducting layer 14 without stopping the rotating equipment 1 as in the conventional visual inspection, and can continue the stable operation of the rotating equipment 1 .

Furthermore, the stator coil deterioration monitoring system 20 of the rotary machine according to the first embodiment measures the concentrations of ozone and nitrogen oxides and monitors the replacement timing of the stator coils 10, however, only the concentration of ozone is measured and the stator coils 10 are monitored, or, By simply measuring the concentration of nitrogen oxides and monitoring the stator coil 10 , the deterioration of the semiconductive layer 14 can be continuously monitored without stopping the rotating equipment 1 , and the stable operation of the rotating equipment 1 can be continued.

Furthermore, in the concentration measuring unit 21 of the first embodiment, the ozone detection tube 29 that measures the concentration by the degree of discoloration is used so as to pass through the internal ambient gas of the rotary machine 1, but an ozone monitor, infrared light, etc. may also be used. A spectrometer and the like can exhibit the same effect.

Furthermore, the operation of the deterioration monitoring unit described in the present invention to report the approach to the life of the stator coil is performed on the display unit of an arithmetic processing device such as a microcomputer under the deterioration monitoring process performed by the deterioration monitoring unit 23 of the first embodiment. 24 shows "monitoring required level", "warning level" and "immediate response level", however, the gist of the present invention is not limited to this. For example, an operator may visually confirm the ozone concentration measurement value OC and the nitrogen oxide concentration measurement value NC, and report the erosion state of the semiconductive layer 14 in writing, and the same effect can be achieved.

[Configuration of Concentration Measurement Section]

Next, FIG. 8 to FIG. 10 show the specific configuration of the concentration measuring unit 21 .

8 shows a device for detecting nitrogen oxides, and a gas collection pipe 30 is inserted into a gas collection hole 3 c formed in the machine frame 3 of the rotary machine 1 and communicated with the inside and outside of the rotary machine 1 . The gas collection tube 30 is designed to prevent odor It is formed of a metal material such as a stainless material corroded by oxygen contact, and penetrates to the plug 31 made of silicon. The gas collection pipe 30 is arranged to extend to the inside and the outside of the rotary machine 1 so that the plug 31 is fitted into the gas collection hole 3c.

One end of the outer side of the gas collection pipe 30 is connected to one end of the extension pipe 33 through the connecting pipe 32 . These connecting pipes 32 and extension pipes 33 are flexible pipes formed of synthetic resin materials such as Teflon (trademark registration) which can prevent corrosion by ozone contact.

One end of the ozone absorption filter 28 is connected to the other end of the extension pipe 33 , and one end of the nitrogen oxide detection tube 27 is connected to the other end of the ozone absorption filter 28 . Next, the first gas suction device 25 is connected to the other end of the nitrogen oxide detection tube 27 .

The ozone absorption filter 28 is a hollow tube provided with a gas intake port and a gas exhaust port at both ends in the longitudinal direction, and a plurality of granular aluminum AL as shown in FIG. 9 is accommodated in the hollow tube. Here, the hollow tube shape of the ozone absorbing filter 28 is shown in FIG. 8 , the longitudinal dimension L is 160 mm, and the inner diameter dimension D is 19 mm as shown in FIG. 9 . Next, the granular aluminum AL system to be accommodated is set to a size of about 2 to 5 mm. After this, the internal ambient gas system sucked through the gas collection pipe 30 from the inside of the rotary machine 1 passes through the ozone absorption filter 28 from the gas intake port, and the aluminum AL set to a size of about 2 to 5 mm improves the relationship between the internal ambient gas and the aluminum AL. The contact area, thereby, absorbs or decomposes the ozone contained in the internal ambient gas. In addition, the aluminum AL accommodated in the ozone absorption filter 28 may be formed into a granular shape of about 2 to 5 mm or a scale shape of about 5 mm to 10 mm on one side. Further, the material to be accommodated in the ozone absorbing filter 28 is not limited to aluminum AL, but iron or the like may be any material having a property of absorbing or decomposing ozone. The first gas suction device 25 adjusts and sucks the internal ambient gas of the rotary machine 1 at a flow rate of 50 ml/min and a cumulative flow of 100 ml in order to accurately display the degree of discoloration of the nitrogen oxide detection tube 27 . As a result, the first gas suction device 25 suctions the internal ambient gas at the optimum flow rate and the integrated flow rate, and by this, the concentration detection of nitrogen oxides can be performed with high accuracy.

10 is a device for detecting ozone, the plug 31 is inserted into the gas collection hole 3c formed in the machine frame 3 of the rotary machine 1, whereby the gas collection pipe 30 is extended to the inside and the outside of the rotary machine 1 to be arranged, One end of the outer side of the gas collection pipe 30 is connected to one end of the extension pipe 33 through the connecting pipe 32 . Next, one end of the ozone detection pipe 29 is connected to the other end of the extension pipe 33 , and the second gas suction device 26 is connected to the other end of the ozone detection pipe 29 . The second gas suction device 26 adjusts and sucks the internal ambient gas of the rotary machine 1 at a flow rate of 100 ml/min and a cumulative flow of 1000 ml in order to accurately display the degree of discoloration of the ozone detection tube 29 . As a result, the second gas suction device 26 suctions the internal ambient gas at the optimum flow rate and integrated flow rate, and thus, the concentration detection of ozone can be performed with high accuracy.

[Effect of the concentration measuring section] Next, the effect of the concentration measuring unit 21 will be described. The first gas suction device 25 adjusts and suctions the internal ambient gas of the rotary machine 1 with a flow velocity and an integrated flow rate that accurately indicates the degree of discoloration of the nitrogen oxide detection tube 27 , so that the concentration of nitrogen oxides can be detected with high accuracy. Furthermore, the second gas suction device 26 adjusts the suction of the internal ambient gas of the rotary machine 1 with a flow velocity and an integrated flow rate that accurately indicate the degree of discoloration of the ozone detection tube 29, so that the concentration of ozone can be detected with high accuracy. In addition, the gas collection tube 30 is made of a metal material such as stainless material that can prevent corrosion caused by ozone contact, and the connecting tube 32 and the extension tube 33 are also made of Teflon (trademark registration), which can prevent corrosion caused by ozone contact. Since it is made of synthetic resin material, it can be used in the concentration measuring part 21 for a long time. Further, the ozone absorption filter 28 is a hollow pipe provided with a gas intake port and a gas exhaust port at both ends in the longitudinal direction, and accommodates granular, granular, or one-sided shapes having a size of about 2 to 5 mm. Due to the scaly ozone absorbing material such as aluminum AL or iron having a thickness of about 5 mm to 10 mm, high ozone absorption, Decomposition effect.

1: Rotary machine 2: Machine body 3: Machine Frame 3c: Gas collection hole 4: Rotor 5: Stator 6: Rotary axis 7: Rotor coil 8: stator core 9: Slot 10: Stator coil 11: Wire 12: Wire coil 13: Insulation layer 14: Semi-conductive layer 15: Wedges 20: Stator coil deterioration monitoring system 21: Concentration measuring section (gas detection device) 22: Measurement data recording department 23: Deterioration monitoring department 24: Display part 25: The first gas suction device (suction device for nitrogen oxides) 26: Second gas suction device (ozone suction device) 27: Nitrogen oxide detection tube (nitrogen oxide concentration detection part) 28: Ozone absorption filter 29: Ozone detection tube (ozone concentration detection part) AL: Aluminum

1 is a schematic configuration diagram showing a rotary machine used in the present invention. [ Fig. 2] Fig. 2 is a view taken along the line II-II of Fig. 1 in the direction of arrows, showing a stator coil accommodated in a slot of a stator core in a rotating machine. 3 is a diagram showing the configuration of the stator coil deterioration monitoring system according to the first embodiment of the present invention. [ Fig. 4] Fig. 4 is a diagram showing a configuration of a concentration measuring unit of the stator coil deterioration monitoring system. [ Fig. 5] Fig. 5 is a flowchart showing a deterioration monitoring process performed by a deterioration monitoring unit of the stator coil deterioration monitoring system. 6 is a graph showing the relationship between the degree of progress of erosion of the semiconductive layer of the stator coil due to surface discharge (change in erosion area) and the change in ozone concentration due to the degree of erosion of the semiconductive layer. [ Fig. 7] Fig. 7 is a graph showing changes in the concentrations of ozone and nitrogen oxides generated inside the rotating equipment with the elapse of the operation time of the rotating equipment. [ Fig. 8] Fig. 8 is a diagram showing a device for detecting the concentration of nitrogen oxides in the gas detection device used in the present invention. [ Fig. 9] Fig. 9 is a view in the direction of arrows along the line VIII-VIII of Fig. 8 . [ Fig. 10] Fig. 10 is a diagram showing a device for detecting the concentration of ozone in the gas detection device used in the present invention.

1: Rotary machine

3: Machine Frame

3c: Gas collection hole

21: Concentration measuring section (gas detection device)

25: The first gas suction device (suction device for nitrogen oxides)

27: Nitrogen oxide detection tube (nitrogen oxide concentration detection part)

28: Ozone absorption filter

30: Gas collection tube

31: Bolt

32: connecting pipe

33: Extension Tube

Claims (22)

A gas detection device for a rotating machine for measuring the concentration of nitrogen oxides generated from a stator coil of a rotating machine, comprising: a nitrogen oxide suction device for suctioning the internal ambient gas of the rotating machine; and a nitrogen oxide concentration detection unit , which is connected between the rotating machine and the suction device for nitrogen oxides to detect the concentration of nitrogen oxides contained in the internal ambient gas by means of the internal ambient gas; wherein, the concentration of nitrogen oxides in the nitrogen oxides Between the detection part and the said rotating machine, the ozone absorption filter which absorbs ozone from the said internal environment gas which passed inside is connected. The gas detection device for a rotating machine according to claim 1, wherein the gas detection device is a gas detection device for measuring the concentrations of ozone and nitrogen oxides generated from the stator coil; the gas detection device further includes: an ozone suction device for sucking the internal ambient gas of the rotary machine; and an ozone concentration detection unit connected between the rotary machine and the ozone suction device to detect the internal ambient gas through the internal environmental gas The concentration of ozone contained in the internal ambient gas. The gas detection device for a rotary machine according to claim 1 or 2, wherein the nitrogen oxide concentration detection unit stores a chemical in a sealed tubular container, and communicates with the gas through the internal ambient gas. The nitrogen oxides react and change color, and the nitrogen oxide detection tube is used to measure the concentration of nitrogen oxides according to the degree of discoloration of the chemical. The gas detection device for a rotary machine according to claim 2, wherein the ozone concentration detection unit stores a chemical in a sealed tubular container, and reacts with the ozone to change color by passing through the internal ambient gas, An ozone detector tube that measures the ozone concentration based on the degree of discoloration of the aforementioned chemical. The gas detection device for a rotary machine according to claim 1 or 2, wherein the suction device for nitrogen oxides is designed to suction the internal environment at a flow rate suitable for detection of the concentration of nitrogen oxides by the nitrogen oxide concentration detection unit Gas, the flow rate of the aforementioned internal ambient gas can be adjusted. The gas detection device for a rotary machine according to claim 5, wherein the nitrogen oxide suction device is designed to suck the internal ambient gas at an integrated flow rate suitable for the concentration detection of nitrogen oxides by the nitrogen oxide concentration detection unit, The cumulative flow of the aforementioned internal ambient gas can be adjusted. The gas detection device for a rotary machine according to claim 2, wherein the ozone suction device is configured to suck the internal ambient gas at a flow rate suitable for detection of the concentration of ozone by the ozone concentration detector, and the flow rate of the internal ambient gas is adjustable. The gas detection device for a rotary machine according to claim 7, wherein the ozone suction device is configured to suck the internal ambient gas at an integrated flow rate suitable for detection of the concentration of ozone by the ozone concentration detection unit, and the accumulated amount of the internal ambient gas Flow can be adjusted. The gas detection device for a rotary machine according to claim 1 or 2, wherein the gas detection device for measuring the concentration of nitrogen oxides includes: a gas collection tube inserted into a gas collection hole provided in the rotary machine; and an extension A pipe, which is flexible, is connected to one end of the gas collection pipe on the outside of the rotating machine and the ozone absorbing filter. The gas detection device for a rotary machine according to claim 9, wherein the gas collection tube is formed of a metal material that can prevent corrosion due to exposure to ozone. The gas detection device for a rotary machine according to claim 9, wherein the extension pipe is formed of a synthetic resin material that can prevent corrosion due to exposure to ozone. The gas detection device for a rotary machine according to claim 1 or 2, wherein the ozone absorption filter is provided with: a hollow tube having a gas intake port and a gas exhaust port formed at both ends in the longitudinal direction; and a plurality of The ozone absorbing material is accommodated in the hollow tube. The gas detection device for a rotary machine according to claim 12, wherein the ozone absorbing material has a granular shape with a size of 2 to 5 mm, or a scaly shape with a side of 5 to 10 mm. The gas detection device for a rotary machine according to claim 2, wherein the gas detection device for measuring the concentration of ozone includes: a gas collection tube inserted into a gas collection hole provided in the rotary machine; and an extension tube having It is flexible, and is connected to one end of the outside of the rotating machine of the gas collection pipe and the ozone concentration detection part. The gas detection device for a rotary machine according to claim 14, wherein the gas collection tube is formed of a metal material that can prevent corrosion due to exposure to ozone. The gas detection device for a rotary machine according to claim 14 or 15, wherein the extension pipe is formed of a synthetic resin material that can prevent corrosion due to exposure to ozone. A gas detection method for a rotating machine for measuring the concentration of ozone and nitrogen oxides generated from a stator coil of a rotating machine, wherein an ozone concentration detection part is connected to the rotating machine so that the internal ambient gas of the rotating machine passes through the ozone concentration detection part In a manner, the ozone concentration detection part detects the concentration of ozone contained in the internal ambient gas; A nitrogen oxide concentration detection unit is connected to the rotating equipment, and the nitrogen oxide concentration detection unit detects nitrogen oxides contained in the internal ambient gas such that the internal ambient gas of the rotating equipment passes through the nitrogen oxide concentration detection unit An ozone absorption filter for absorbing ozone from the internal ambient gas passing through is connected between the nitrogen oxide concentration detection unit and the rotating machine. The gas detection method for a rotary machine according to claim 17, wherein, when the internal ambient gas of the rotary machine is passed through the nitrogen oxide concentration detection portion, the nitrogen oxide concentration detection portion is suitable for the nitrogen oxide concentration detection portion. flow rate to attract the aforementioned internal ambient gas. The gas detection method for a rotary machine according to claim 18, wherein when the internal ambient gas of the rotary machine is passed through the nitrogen oxide concentration detection portion, the nitrogen oxide concentration detection portion is adapted to the nitrogen oxide concentration detection portion. The cumulative flow to attract the aforementioned internal ambient gas. The gas detection method for a rotary machine according to any one of claims 17 to 19, wherein when the internal ambient gas of the rotary machine is passed through the ozone concentration detection section, the ozone concentration detection section is adapted to the ozone concentration detection section. flow rate to attract the aforementioned internal ambient gas. The gas detection method of a rotating machine as claimed in claim 20, wherein, When the internal ambient gas of the rotating machine is passed through the ozone concentration detection portion, the internal ambient gas is sucked at an integrated flow rate suitable for the concentration detection of ozone by the ozone concentration detection portion. A system for monitoring deterioration of stator coils in a rotating machine, comprising: a gas detection device for a rotating machine according to claim 2; When it is judged that the erosion of the semiconducting layer has progressed to the extent that the semiconducting layer is deteriorated, the state of the stator coil is reported, and the semiconducting layer is judged based on the concentration of nitrogen oxides detected by the gas detection device. The degree to which the erosion of the conductive layer has progressed, and it is reported that the life of the stator coil will be exhausted.

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