Monitoring device and monitoring method for stator bar in high-altitude environment

Abstract

The invention discloses a monitoring device and a monitoring method for a stator bar in a high-altitude environment, and relates to the field of monitoring of the insulating capacity of a generator stator bar. The simulation box is a sealed box body; the stator bar is installed in the simulation box. The air pressure control module is used for controlling the air pressure in the simulation box; the atmosphere control module is used for controlling the oxygen concentration in the simulation box; the humidity control module is used for controlling the humidity in the simulation box; the temperature control module is used for controlling the environment temperature in the simulation box; the macroscopic deformation monitoring module is used for acquiring macroscopic deformation of the stator bar; the internal stress monitoring module is used for acquiring internal stress of the stator bar; and the master controller is connected with each module. According to the invention, the problem that the full periodicity of the generator stator bar operating under the high-altitude environment condition under the insulation alternating thermal aging effect cannot be effectively monitored in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of monitoring the insulation capacity of a generator stator bar, and in particular to a monitoring device and a monitoring method for a stator bar in a high altitude environment. Background Art

[0002] The stator bar insulation of large-scale generator sets currently mainly adopts the high-resistance molded and low-resistance VPI insulation system. With the rapid development of the power system, the stator bar insulation of large-scale generators is used in extreme environments at high altitudes, which puts forward strict requirements on the stability of the stator bar insulation of the generator. For example, during operation, the main insulation of the stator bar will be subjected to alternating heat aging for a long time, which may cause problems such as small air gaps, delamination or shelling in the insulation, aggravating the internal discharge of the insulation and causing the insulation performance to gradually decrease.

[0003] The existing technical scheme mainly uses alternating heat aging tests to detect insulation dimensions and integrity under different test cycles to evaluate whether the insulation has defects such as delamination or shelling. This detection method has the following problems: 1) The existing alternating heat stress test is carried out at normal altitudes, and the high-altitude environment is different from the normal altitude environment. There are large differences in the degradation development process of the insulation material. The simulation conclusion of alternating heat stress at normal altitudes cannot be used as the simulation conclusion under high-altitude environments; 2) Periodic detection is carried out at room temperature, and the performance parameters of the entire alternating heat stress process cannot be directly obtained; 3) The test results cannot distinguish the location of the degradation defects inside the insulation, which is not conducive to the subsequent optimization design of the stator bar insulation structure. How to effectively monitor the full-cycle performance of the stator bar insulation of generators operating under high-altitude environmental conditions under alternating heat aging is an important problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a monitoring device and a monitoring method for stator bars in a high-altitude environment in order to solve the problem that the prior art lacks effective monitoring of the full-cycle performance of the stator bar insulation of a generator operating under alternating thermal aging conditions under high-altitude environmental conditions.

[0005] The technical solution adopted by the present invention is as follows: a monitoring device for stator bars in a high-altitude environment, comprising a simulation box, the simulation box is provided with an expansion port, the expansion port is connected to an air pressure control module, a humidity control module, an atmosphere control module, a temperature control module, a macro deformation monitoring module, an internal stress monitoring module and a master controller; wherein:

[0006] The simulation box is a sealed box that isolates the internal and external environments. During monitoring, the stator bars are installed in the simulation box.

[0007] An air pressure control module, used to control the air pressure in the simulation box;

[0008] Atmosphere control module, used to control the oxygen concentration in the simulation box;

[0009] A humidity control module, used to control the humidity in the simulation box;

[0010] A temperature control module is used to control the ambient temperature in the simulation box;

[0011] The macro deformation monitoring module is used to obtain the macro deformation of the stator wire bar when alternating thermal aging occurs in the simulation box;

[0012] Internal stress monitoring module, used to obtain the internal stress of the stator bar when alternating thermal aging occurs in the simulation box;

[0013] The main controller is connected with the air pressure control module, the humidity control module, the atmosphere control module, the temperature control module, the macro deformation monitoring module and the internal stress monitoring module.

[0014] Furthermore, the air pressure control module includes an air pressure sensor, a compressed air tank and a vacuum pump; the air pressure sensor is installed in the simulation box to obtain the gas pressure in the simulation box, the vacuum pump is connected to the interior of the simulation box through a first solenoid valve, and the compressed air tank is connected to the interior of the simulation box through a second solenoid valve; the air pressure sensor is connected to the input end of the main controller, and the output end of the main controller is connected to the vacuum pump, the first solenoid valve and the second solenoid valve.

[0015] Furthermore, the atmosphere control module includes an oxygen concentration sensor, a nitrogen storage tank and an oxygen storage tank; the oxygen concentration sensor is installed in the simulation box to obtain the oxygen concentration in the simulation box, the nitrogen storage tank is connected to the inside of the simulation box through a third solenoid valve, and the oxygen storage tank is connected to the inside of the simulation box through a fourth solenoid valve; the oxygen concentration sensor is connected to the input end of the main controller, and the output end of the main controller is connected to the third solenoid valve and the fourth solenoid valve.

[0016] Furthermore, the humidity control module includes a humidity sensor, a humidifier, a dehumidifier, and a circulating pump; the humidity sensor is arranged in the simulation box to obtain the ambient humidity in the simulation box, the humidifier is connected to the interior of the simulation box through the fifth solenoid valve, the dehumidifier is connected to the interior of the simulation box through the sixth solenoid valve, the inlet of the circulating pump is connected to the interior of the simulation box through the seventh solenoid valve, and the humidifier and the dehumidifier are connected in parallel to the outlet of the circulating pump; the humidity sensor is connected to the input end of the main controller, and the output end of the main controller is connected to the circulating pump, the humidifier, the dehumidifier, the fifth solenoid valve, the sixth solenoid valve, and the seventh solenoid valve.

[0017] Furthermore, the temperature control module includes a temperature sensor and a semiconductor refrigeration chip. The temperature sensor is arranged inside the simulation box to obtain the ambient temperature inside the simulation box. One end of the semiconductor refrigeration chip is located inside the simulation box, and the other end is located outside the simulation box. The temperature sensor is connected to the input end of the main controller, and the semiconductor refrigeration chip is connected to the output end of the main controller.

[0018] Furthermore, the macro deformation monitoring module includes a camera, which is mounted on the simulation box and faces the inside of the simulation box, and is connected to the main controller.

[0019] Furthermore, the internal stress monitoring module includes an internal stress sensor that can be installed on the stator bar, and the internal stress sensor is connected to the main controller.

[0020] Furthermore, the simulation box comprises a box body and a box door, the box door is hinged to the box body to open and close the box body, and a sealing ring is arranged on the end surface of the box door close to the box body.

[0021] Furthermore, the master controller is connected to an external power supply or a battery.

[0022] A method for monitoring stator wire bars in a high-altitude environment, using a device for monitoring stator wire bars in a high-altitude environment, comprises the following steps:

[0023] S1: Place the stator bar to be monitored in the simulation box and adjust the position of the stator bar so that the camera can face the stator bar;

[0024] S2: Install the internal stress sensor on the stator bar;

[0025] S3: closed simulation box;

[0026] S4: Under the control of the master controller, the air pressure in the simulation box is adjusted by the air pressure control module, the oxygen concentration in the simulation box is adjusted by the atmosphere control module, the ambient humidity in the simulation box is adjusted by the humidity control module, and the ambient temperature in the simulation box is adjusted by the temperature control module, so that the environment in the simulation box is equivalent to the high-altitude environment in real time;

[0027] S5: The stator wire rod undergoes alternating thermal aging in the simulation box. The camera obtains the macroscopic deformation of the stator wire rod, and the internal stress sensor obtains the internal stress of the stator wire rod during the alternating thermal aging process, completing the real-time monitoring of the alternating thermal aging of the stator wire rod in a high-altitude environment.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] The present invention controls the air pressure control module, the humidity control module, the atmosphere control module, and the temperature control module through a general controller, so that the environment inside the simulation box can be equivalent to the high-altitude environment in real time, including the changes in the air pressure, oxygen concentration, humidity and temperature of the high-altitude environment with the flow of time, thereby realizing the simulation of alternating thermal aging of the stator wire rods in the high-altitude environment; the deformation of the stator wire rods when alternating thermal aging occurs is monitored through the macro deformation monitoring module, and the internal stress of the stator wire rods when alternating thermal aging occurs is monitored through the internal stress monitoring module, and the alternating thermal aging performance of the stator wire rods is comprehensively evaluated in combination with the deformation and the internal stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0031] Figure 1 A structural schematic diagram of the present invention;

[0032] Figure 2 Another structural schematic diagram of the present invention;

[0033] Figure 3 It is a control schematic diagram of the present invention;

[0034] Markings in the figure: 1-simulation box; 2-master controller; 3-stator wire rod; 41-air pressure sensor; 42-vacuum pump; 43-first solenoid valve; 44-compressed air tank; 45-second solenoid valve; 46-air pressure controller; 51-oxygen concentration sensor; 52-oxygen storage tank; 53-fourth solenoid valve; 54-nitrogen storage tank; 55-third solenoid valve; 56-atmosphere controller; 61-humidity sensor; 62-humidifier; 63-fifth solenoid valve; 64-dehumidifier; 65-sixth solenoid valve; 66-circulation pump; 67-seventh solenoid valve; 68-humidity controller; 71-temperature sensor; 72-semiconductor refrigeration plate; 73-temperature controller; 81-internal stress sensor; 82-stress analysis controller; 91-camera; 92-image processing controller. DETAILED DESCRIPTION

[0035] In the description of this specification, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of this specification is usually placed when used. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this specification.

[0036] In addition, if the terms "horizontal" or "vertical" appear in the description of this specification, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this specification, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between the internal parts of two elements.

[0038] Example 1

[0039] like Figure 1-Figure 3 As shown, a monitoring device for stator bars 3 in a high-altitude environment includes a simulation box 1, which is provided with an expansion port, and the expansion port is connected to an air pressure control module, a humidity control module, an atmosphere control module, a temperature control module, a macro deformation monitoring module, an internal stress monitoring module and a master controller 2; wherein:

[0040] The simulation box 1 is a sealed box that isolates the inside of the box from the outside environment to ensure that the environment inside the simulation box 1 is stable; when monitoring, the stator wire rod 3 is installed in the simulation box 1; specifically, a mounting platform is provided on the inner wall of the simulation box 1, and the stator wire rod 3 can be installed on the mounting platform.

[0041] The air pressure control module is used to control the air pressure in the simulation box 1; the atmosphere control module is used to control the oxygen concentration in the simulation box 1; the humidity control module is used to control the humidity in the simulation box 1; the temperature control module is used to control the ambient temperature in the simulation box 1; the macro deformation monitoring module is used to obtain the macro deformation of the stator wire rod 3 when the alternating thermal aging occurs in the simulation box 1; the internal stress monitoring module is used to obtain the internal stress of the stator wire rod 3 when the alternating thermal aging occurs in the simulation box 1; the main controller 2, together with the air pressure control module, the humidity control module, the atmosphere control module, the temperature control module, the macro deformation monitoring module, the internal stress monitoring module All modules are connected; that is, the air pressure control module, humidity control module, atmosphere control module, and temperature control module are controlled by the main controller 2, so that the environment inside the simulation box 1 can be equivalent to the high-altitude environment in real time, including the changes in air pressure, oxygen concentration, humidity and temperature of the high-altitude environment with the flow of time, thereby realizing the simulation of alternating thermal aging of the stator wire rod 3 in a high-altitude environment; the deformation of the stator wire rod 3 when alternating thermal aging occurs is monitored by the macro deformation monitoring module, and the internal stress of the stator wire rod 3 when alternating thermal aging occurs is monitored by the internal stress monitoring module, and the alternating thermal aging performance of the stator wire rod 3 is comprehensively evaluated in combination with the deformation and internal stress.

[0042] Example 2

[0043] Based on Example 1, a specific implementation method that can be implemented is further proposed.

[0044] Regarding the air pressure control module, a feasible implementation method is that the air pressure control module includes an air pressure sensor 41, a compressed air tank 44 and a vacuum pump 42; the air pressure sensor 41 is installed in the simulation box 1 to obtain the gas pressure in the simulation box 1, the vacuum pump 42 is connected to the inside of the simulation box 1 through the first solenoid valve 43, and the compressed air tank 44 is connected to the inside of the simulation box 1 through the second solenoid valve 45; the air pressure sensor 41 is connected to the input end of the main controller 2, and the output end of the main controller 2 is connected to the vacuum pump 42, the first solenoid valve 43 and the second solenoid valve 45; the gas pressure in the simulation box 1 is obtained through the air pressure sensor 41, and the air The pressure sensor 41 transmits the real-time gas pressure to the main controller 2, and the main controller 2 compares the real-time gas pressure with the set gas pressure; if the real-time gas pressure is lower than the set gas pressure, the main controller 2 controls the second solenoid valve 45 to open, and the air in the compressed air tank 44 enters the simulation box 1, and the real-time gas pressure in the simulation box 1 increases to the set gas pressure; if the real-time gas pressure is higher than the set gas pressure, the main controller 2 controls the first solenoid valve 43 to open, and at the same time controls the vacuum pump 42 to open, and the vacuum pump 42 extracts the air in the simulation box 1, and the real-time gas pressure in the simulation box 1 decreases to the set gas pressure.

[0045] It should be noted that the air pressure control module may also include an air pressure controller 46. The air pressure sensor 41 is connected to the main controller 2 through the air pressure controller 46, that is, the air pressure sensor 41 transmits the gas pressure to the main controller 2 through the air pressure controller 46. The main controller 2 compares the acquired real-time gas pressure with the set gas pressure, and feeds back the comparison result to the air pressure controller 46. The air pressure controller 46 controls the opening or closing of the vacuum pump 42, the first solenoid valve 43 and the second solenoid valve 45 according to the comparison result, thereby realizing the gas pressure control in the simulation box 1; adding the air pressure controller 46 can effectively reduce the calculation amount and workload of the main controller 2, thereby reducing the burden on the main controller 2, realizing one-to-one control, and effectively improving the overall life.

[0046] Regarding the atmosphere control module, a feasible implementation manner, the atmosphere control module includes an oxygen concentration sensor 51, a nitrogen storage tank 54 and an oxygen storage tank 52; the oxygen concentration sensor 51 is installed in the simulation box 1 to obtain the oxygen concentration in the simulation box 1, the nitrogen storage tank 54 is connected to the inside of the simulation box 1 through the third solenoid valve 55, and the oxygen storage tank 52 is connected to the inside of the simulation box 1 through the fourth solenoid valve 53; the oxygen concentration sensor 51 is connected to the input end of the main controller 2, and the output end of the main controller 2 is connected to the third solenoid valve 55 and the fourth solenoid valve 53; the oxygen concentration sensor 51 is used to obtain the oxygen concentration in the simulation box 1. The oxygen concentration sensor 51 transmits the real-time oxygen concentration to the main controller 2, and the main controller 2 compares the real-time oxygen concentration with the set oxygen concentration; if the real-time oxygen concentration is less than the set oxygen concentration, the main controller 2 controls the fourth solenoid valve 53 to open, and the oxygen in the oxygen storage tank 52 enters the simulation box 1, and the real-time oxygen concentration in the simulation box 1 increases to the set oxygen concentration; if the real-time oxygen concentration is greater than the set oxygen concentration, the main controller 2 controls the third solenoid valve 55 to open, and the nitrogen in the nitrogen storage tank 54 enters the simulation box 1, and the real-time oxygen concentration in the simulation box 1 decreases to the set oxygen concentration.

[0047] It should be noted that an atmosphere controller 56 may also be provided in the atmosphere control module. The working principle and function of the atmosphere controller 56 are similar to those of the air pressure controller 46 and will not be described in detail here.

[0048] It should be noted that the atmosphere control module and the air pressure control module need to work simultaneously to ensure that the oxygen concentration is at the set value while also ensuring that the gas pressure is at the set value.

[0049] Regarding the humidity control module, a feasible implementation manner, the humidity control module includes a humidity sensor 61, a humidifier 62, a dehumidifier 64, and a circulating pump 66; the humidity sensor 61 is arranged in the simulation box 1 to obtain the ambient humidity in the simulation box 1, the humidifier 62 is connected to the inside of the simulation box 1 through the fifth solenoid valve 63, the dehumidifier 64 is connected to the inside of the simulation box 1 through the sixth solenoid valve 65, the inlet of the circulating pump 66 is connected to the inside of the simulation box 1 through the seventh solenoid valve 67, and the humidifier 62 and the dehumidifier 64 are connected in parallel to the outlet of the circulating pump 66; the humidity sensor 61 is connected to the input end of the main controller 2, and the output end of the main controller 2 is connected to the circulating pump 66, the humidifier 62, the dehumidifier 64, the fifth solenoid valve 63, the sixth solenoid valve 65, and the seventh solenoid valve 67; the humidity of the simulation box 1 is obtained through the humidity sensor 61 The ambient humidity inside, and the humidity sensor 61 transmits the real-time humidity data to the main controller 2, and the main controller 2 compares the real-time humidity data with the set humidity data; if the real-time humidity data is less than the set humidity data, the main controller 2 controls the seventh solenoid valve 67, the fifth solenoid valve 63 and the humidifier 62 to open, and the air in the simulation box 1 circulates through the circulation pump 66, and the circulation path passes through the humidifier 62, thereby increasing the real-time humidity data in the simulation box 1 to the set humidity data; if the real-time humidity data is greater than the set humidity data, the main controller 2 controls the seventh solenoid valve 67, the sixth solenoid valve 65 and the dehumidifier 64 to open, and the air in the simulation box 1 circulates through the circulation pump 66, and the circulation path passes through the dehumidifier 64, thereby reducing the real-time humidity data in the simulation box 1 to the set humidity data.

[0050] It should be noted that a humidity controller 68 may also be provided in the humidity control module. The working principle and function of the humidity controller 68 are similar to those of the air pressure controller 46 and will not be described in detail here.

[0051] Of course, if Figure 2 As shown, the vacuum pump 42 in the air pressure control module can also be used as the circulation pump 66 in the humidity control module. The first solenoid valve 43 is equivalent to the seventh solenoid valve 67, except that a valve needs to be installed on the pipeline connecting the vacuum pump 42 to the outside. When performing humidity control, the valve needs to be closed.

[0052] Regarding the temperature control module, a feasible implementation manner is that the temperature control module includes a temperature sensor 71 and a semiconductor refrigeration plate 72, the temperature sensor 71 is arranged inside the simulation box 1 to obtain the ambient temperature inside the simulation box 1, one end of the semiconductor refrigeration plate 72 is located inside the simulation box 1, and the other end is located outside the simulation box 1, the temperature sensor 71 is connected to the input end of the main controller 2, and the semiconductor refrigeration plate 72 is connected to the output end of the main controller 2; the ambient temperature inside the simulation box 1 is obtained by the temperature sensor 71, and the temperature sensor 71 transmits real-time temperature data to the main controller 2, and the main controller 2 compares the real-time temperature data with the set temperature data; if the real-time temperature data is less than the set temperature data, the main controller 2 controls one end of the semiconductor refrigeration plate 72 located inside the simulation box 1 to heat, and the temperature inside the simulation box 1 increases, thereby realizing that the real-time temperature data inside the simulation box 1 increases to the set temperature data; if the real-time temperature data is greater than the set temperature data, the main controller 2 controls one end of the semiconductor refrigeration plate 72 located inside the simulation box 1 to cool, and the temperature inside the simulation box 1 decreases, thereby realizing that the real-time temperature data inside the simulation box 1 decreases to the set temperature data.

[0053] It should be noted that a temperature controller 73 may also be provided in the temperature control module. The working principle and function of the temperature controller are similar to those of the air pressure controller 46 and will not be described in detail here.

[0054] For the macro deformation monitoring module, a feasible implementation mode is that the macro deformation monitoring module includes a camera 91, which is installed on the simulation box 1 and faces the inside of the simulation box 1. The camera 91 is connected to the main controller 2. The camera 91 continuously takes pictures of the stator wire rod 3 to obtain the macro deformation of the stator wire rod 3.

[0055] It should be noted that the camera 91 can be connected to the main controller 2 via the image processing controller 92. The image processing controller 92 performs image processing on the photos taken by the camera 91, and the processed data is then transmitted to the main controller 2. The main controller 2 performs data analysis, which effectively reduces the calculation amount and workload of the main controller 2, thereby reducing the burden on the main controller 2, realizing one-to-one control, and effectively improving the overall life.

[0056] For the internal stress monitoring module, a feasible implementation method is that the internal stress monitoring module includes an internal stress sensor 81 that can be installed on the stator wire rod 3, and the internal stress sensor 81 is connected to the main controller 2; wherein, the internal stress sensor 81 is preferably a pre-embedded sensor, such as a stress sensor of the LM-12 type, which is a chip-level sensor and can automatically measure the magnitude and direction of the residual stress. Specifically, when installing the stator wire rod 3, a hole can be opened on the stator wire rod 3 using a hole opener, and then the internal stress sensor 81 is pre-embedded in the hole; the internal stress sensor 81 can detect stress changes when the stator wire rod 3 produces alternating thermal aging, and transmit the stress data to the main controller 2, and the controller comprehensively evaluates the alternating thermal aging performance of the stator wire rod 3 in combination with the macro deformation of the stator wire rod 3.

[0057] It should be noted that the internal stress sensor 81 can be connected to the main controller 2 through the stress analysis controller 82. The stress analysis controller 82 processes the data transmitted by the internal stress sensor 81 (including noise reduction processing, etc.), and the processed data is then transmitted to the main controller 2. The main controller 2 performs data analysis, which effectively reduces the calculation amount and workload of the main controller 2, thereby reducing the burden on the main controller 2, realizing one-to-one control, and effectively improving the overall life.

[0058] Example 3

[0059] Based on any one of the implementations in Examples 1-2, a feasible implementation is further proposed.

[0060] In a feasible implementation, the simulation box 1 has a box body and a box door, the box body has a box opening, the stator bar 3 can be taken out from the box opening or installed in the box body, the box door is hinged to the box body, the hinge position is located at the box opening to open and close the box body, and a sealing ring is provided on the end surface of the box door close to the box body, and the surrounding size of the sealing ring is larger than the box opening to achieve sealing of the box opening. The box door can be locked in a conventional manner, such as a buckle, a hasp, etc.

[0061] In a feasible implementation manner, the master controller 2 is connected to an external power source or a battery to obtain a continuous power supply.

[0062] In a feasible implementation manner, the main controller 2 can be a PC with a display screen, which can realize the visualization of the environmental data (air pressure, oxygen concentration, humidity, temperature and other data) in the simulation box 1, the deformation data of the stator wire rod 3, and the internal stress data.

[0063] Example 4

[0064] like Figure 1-Figure 3As shown, a monitoring method for stator wire bars 3 in a high altitude environment, using a monitoring device for stator wire bars 3 in a high altitude environment described in any one of embodiments 1-3, comprises the following steps:

[0065] S1: placing the stator bar 3 to be monitored in the simulation box 1, and adjusting the position of the stator bar 3 so that the camera 91 can face the stator bar 3;

[0066] S2: Install the internal stress sensor 81 on the stator bar 3;

[0067] S3: closed simulation box 1;

[0068] S4: Under the control of the master controller 2, the air pressure in the simulation box 1 is adjusted by the air pressure control module, the oxygen concentration in the simulation box 1 is adjusted by the atmosphere control module, the ambient humidity in the simulation box 1 is adjusted by the humidity control module, and the ambient temperature in the simulation box 1 is adjusted by the temperature control module, so that the environment in the simulation box 1 is equivalent to the high-altitude environment in real time;

[0069] S5: The stator wire bar 3 undergoes alternating thermal aging in the simulation box 1. The camera 91 obtains the macro deformation of the stator wire bar 3. The internal stress sensor 81 obtains the internal stress of the stator wire bar 3 during the alternating thermal aging process, thereby completing the real-time monitoring of the alternating thermal aging of the stator wire bar 3 in a high-altitude environment.

[0070] The method controls the air pressure control module, the humidity control module, the atmosphere control module, and the temperature control module through the main controller 2, so that the environment inside the simulation box 1 can be equivalent to the high-altitude environment in real time, including the changes in the air pressure, oxygen concentration, humidity and temperature of the high-altitude environment with the flow of time, thereby realizing the simulation of the alternating thermal aging of the stator wire rod 3 in the high-altitude environment; the deformation of the stator wire rod 3 when the alternating thermal aging occurs is monitored through the macro deformation monitoring module, and the internal stress of the stator wire rod 3 when the alternating thermal aging occurs is monitored through the internal stress monitoring module, and the alternating thermal aging performance of the stator wire rod 3 is comprehensively evaluated in combination with the deformation and the internal stress.

[0071] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A monitoring device for stator bars in a high altitude environment, characterized in that: The simulation box (1) comprises a simulation box (1), wherein the simulation box (1) is provided with an expansion port, and the expansion port is connected to an air pressure control module, a humidity control module, an atmosphere control module, a temperature control module, a macro deformation monitoring module, an internal stress monitoring module and a master controller (2); wherein: The simulation box (1) is a sealed box that isolates the inside of the box from the outside environment. When monitoring is performed, the stator bar (3) is installed in the simulation box (1); An air pressure control module, used for controlling the air pressure in the simulation box (1); An atmosphere control module, used for controlling the oxygen concentration in the simulation box (1); A humidity control module, used for controlling the humidity in the simulation box (1); A temperature control module, used for controlling the ambient temperature in the simulation box (1); A macro deformation monitoring module, used for obtaining the macro deformation of the stator wire bar (3) when alternating thermal aging occurs in the simulation box (1); An internal stress monitoring module, used for obtaining the internal stress of the stator wire bar (3) when alternating thermal aging occurs in the simulation box (1); The main controller (2) is connected to the air pressure control module, the humidity control module, the atmosphere control module, the temperature control module, the macro deformation monitoring module, and the internal stress monitoring module.

2. The monitoring device according to claim 1, characterized in that: The air pressure control module comprises an air pressure sensor (41), a compressed air tank (44) and a vacuum pump (42); the air pressure sensor (41) is installed in the simulation box (1) to obtain the gas pressure in the simulation box (1); the vacuum pump (42) is connected to the interior of the simulation box (1) through a first solenoid valve (43); the compressed air tank (44) is connected to the interior of the simulation box (1) through a second solenoid valve (45); the air pressure sensor (41) is connected to the input end of the main controller (2); and the output end of the main controller (2) is connected to the vacuum pump (42), the first solenoid valve (43) and the second solenoid valve (45).

3. The monitoring device according to claim 1, characterized in that: The atmosphere control module comprises an oxygen concentration sensor (51), a nitrogen storage tank (54) and an oxygen storage tank (52); the oxygen concentration sensor (51) is installed in the simulation box (1) to obtain the oxygen concentration in the simulation box (1); the nitrogen storage tank (54) is connected to the inside of the simulation box (1) through a third solenoid valve (55); the oxygen storage tank (52) is connected to the inside of the simulation box (1) through a fourth solenoid valve (53); the oxygen concentration sensor (51) is connected to the input end of the master controller (2); and the output end of the master controller (2) is connected to the third solenoid valve (55) and the fourth solenoid valve (53).

4. The monitoring device according to claim 1, characterized in that: The humidity control module comprises a humidity sensor (61), a humidifier (62), a dehumidifier (64), and a circulation pump (66); the humidity sensor (61) is arranged in the simulation box (1) for obtaining the ambient humidity in the simulation box (1); the humidifier (62) is connected to the interior of the simulation box (1) through a fifth solenoid valve (63); the dehumidifier (64) is connected to the interior of the simulation box (1) through a sixth solenoid valve (65); the inlet of the circulation pump (66) is connected to the interior of the simulation box (1) through a seventh solenoid valve (67); the humidifier (62) and the dehumidifier (64) are connected in parallel to the outlet of the circulation pump (66); the humidity sensor (61) is connected to the input end of the master controller (2); and the output end of the master controller (2) is connected to the circulation pump (66), the humidifier (62), the dehumidifier (64), the fifth solenoid valve (63), the sixth solenoid valve (65), and the seventh solenoid valve (67).

5. The monitoring device according to claim 1, characterized in that: The temperature control module comprises a temperature sensor (71) and a semiconductor cooling sheet (72); the temperature sensor (71) is arranged inside the simulation box (1) for obtaining the ambient temperature inside the simulation box (1); one end of the semiconductor cooling sheet (72) is located inside the simulation box (1) and the other end is located outside the simulation box (1); the temperature sensor (71) is connected to the input end of the main controller (2), and the semiconductor cooling sheet (72) is connected to the output end of the main controller (2).

6. The monitoring device according to claim 1, characterized in that: The macro deformation monitoring module comprises a camera (91), which is mounted on the simulation box (1) and faces the interior of the simulation box (1), and is connected to a main controller (2).

7. The monitoring device according to claim 1, characterized in that: The internal stress monitoring module comprises an internal stress sensor (81) that can be mounted on a stator bar (3), and the internal stress sensor (81) is connected to a master controller (2).

8. The monitoring device according to claim 1, characterized in that: The simulation box (1) comprises a box body and a box door, the box door is hinged to the box body to open and close the box body, and a sealing ring is arranged on the end surface of the box door close to the box body.

9. The monitoring device according to claim 1, characterized in that: The master controller (2) is connected to an external power source or a battery.

10. A method for monitoring stator bars in a high altitude environment, using a monitoring device for stator bars (3) in a high altitude environment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: placing a stator bar (3) to be monitored in a simulation box (1), and adjusting the position of the stator bar (3) so that the camera (91) can face the stator bar (3); S2: Installing the internal stress sensor (81) on the stator bar (3); S3: closed simulation box (1); S4: Under the control of the master controller (2), the air pressure in the simulation box (1) is adjusted by the air pressure control module, the oxygen concentration in the simulation box (1) is adjusted by the atmosphere control module, the ambient humidity in the simulation box (1) is adjusted by the humidity control module, and the ambient temperature in the simulation box (1) is adjusted by the temperature control module, so that the environment in the simulation box (1) is equivalent to the environment at a high altitude in real time; S5: The stator wire bar (3) undergoes alternating thermal aging in the simulation box (1), the camera (91) obtains the macroscopic deformation of the stator wire bar (3), and the internal stress sensor (81) obtains the internal stress of the stator wire bar (3) during the alternating thermal aging process, thereby completing real-time monitoring of the alternating thermal aging of the stator wire bar in a high-altitude environment.

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