Device for monitoring alternating thermal aging effect of atmosphere and humidity on stator bar

Abstract

The utility model discloses a device for monitoring the alternating thermal aging effect of atmosphere and humidity on a stator bar, and relates to the field of monitoring 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 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 utility model, the problem that the full periodicity of the generator stator bar operated under the oxygen concentration and humidity conditions in the high altitude environment cannot be effectively monitored under the insulation alternating thermal aging effect in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the monitoring field of generator stator bar insulation capacity, especially a monitoring device of atmosphere, humidity to stator bar alternating thermal aging effect. BACKGROUND

[0002] At present, the insulation of large generator set stator bar mainly adopts multi-glue mould pressing and little glue VPI insulation system, with the rapid development of power system, the insulation of large generator set stator bar is applied in high altitude extreme environment, and strict requirements are put forward to the stability of generator stator bar insulation, for example, the main insulation of stator bar can be subjected to alternating thermal aging effect for a long time during operation, which can cause problems such as small air gap, delamination or shell separation of insulation, aggravate internal discharge of insulation and cause gradual decline of insulation performance.

[0003] The existing technical scheme mainly detects the insulation size and overall performance under different test periods through alternating thermal aging test to evaluate whether insulation has defects such as delamination or shell separation, and the detection method has the following problems: 1) the existing alternating thermal stress test is carried out at conventional altitude, but the oxygen concentration and humidity in high altitude environment are different from those in conventional altitude, and the deterioration development process of insulation material is quite different, so the simulation conclusion of alternating thermal stress at conventional altitude cannot be used as the simulation conclusion in high altitude environment; 2) the periodic detection is carried out at room temperature, and the performance parameters in the whole alternating thermal stress process cannot be directly obtained; 3) the detection result cannot distinguish the position of the deterioration defect in the insulation, which is not conducive to the optimization design of the stator bar insulation structure. How to effectively monitor the whole cycle performance of the generator stator bar insulation under alternating thermal aging effect in high altitude low oxygen concentration and humidity environment is an important problem to be solved. UTILITY MODEL CONTENTS

[0004] The utility model discloses a monitoring device of atmosphere, humidity to stator bar alternating thermal aging effect to solve the problem that the prior art lacks effective monitoring of the whole cycle performance of the generator stator bar insulation under alternating thermal aging effect in high altitude oxygen concentration and humidity conditions.

[0005] The utility model discloses the technical scheme as follows: a monitoring device of atmosphere, humidity to stator bar alternating thermal aging effect, including simulation box, be provided with the extension mouth on the simulation box, and the extension mouth is connected with humidity control module, atmosphere control module, temperature control module, macroscopic deformation monitoring module, internal stress monitoring module and total controller, wherein:

[0006] The simulation box is a sealed box body, which isolates the internal environment from the external environment, and the stator bar is installed in the simulation box during monitoring.

[0007] an atmosphere control module for controlling the oxygen concentration in the simulation box;

[0008] a humidity control module for controlling the humidity in the simulation box;

[0009] a temperature control module for controlling the ambient temperature in the simulation box;

[0010] a macroscopic deformation monitoring module for obtaining the macroscopic deformation of the stator bar when the stator bar is subjected to alternating thermal aging in the simulation box;

[0011] an internal stress monitoring module for obtaining the internal stress of the stator bar when the stator bar is subjected to alternating thermal aging in the simulation box;

[0012] a total controller connected to the humidity control module, the atmosphere control module, the temperature control module, the macroscopic deformation monitoring module, and the internal stress monitoring module.

[0013] Further, the atmosphere control module comprises an oxygen concentration sensor, a nitrogen storage tank, and an oxygen storage tank; the oxygen concentration sensor is installed in the simulation box for obtaining the oxygen concentration in the simulation box, the nitrogen storage tank is connected to the inside of the simulation box through a first electromagnetic valve, and the oxygen storage tank is connected to the inside of the simulation box through a second electromagnetic valve; the oxygen concentration sensor is connected to the input end of the total controller, and the output end of the total controller is connected to the first electromagnetic valve and the second electromagnetic valve.

[0014] Further, the humidity control module comprises a humidity sensor, a humidifier, a dehumidifier, and a circulating pump; the humidity sensor is arranged in the simulation box for obtaining the ambient humidity in the simulation box, the humidifier is connected to the inside of the simulation box through a third electromagnetic valve, the dehumidifier is connected to the inside of the simulation box through a fourth electromagnetic valve, the inlet of the circulating pump is connected to the inside of the simulation box through a fifth electromagnetic 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 total controller, and the output end of the total controller is connected to the circulating pump, the humidifier, the dehumidifier, the third electromagnetic valve, the fourth electromagnetic valve, and the fifth electromagnetic valve.

[0015] Further, the temperature control module comprises a semiconductor refrigeration sheet, one end of the semiconductor refrigeration sheet is located in the simulation box, and the other end is located outside the simulation box.

[0016] Further, the temperature control module further comprises a temperature sensor, the temperature sensor is arranged in the simulation box for obtaining the ambient temperature in the simulation box, the temperature sensor is connected to the input end of the total controller, and the semiconductor refrigeration sheet is connected to the output end of the total controller.

[0017] Further, the macroscopic deformation monitoring module comprises a camera, the camera is installed on the simulation box and faces the inside of the simulation box, and the camera is connected to the total controller.

[0018] Further, the internal stress monitoring module comprises an internal stress sensor capable of being mounted on the stator bar, and the internal stress sensor is connected with the general controller.

[0019] Further, the simulation box has a box body and a box door 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.

[0020] Further, the general controller is externally connected with a power supply or connected with a storage battery.

[0021] Further, the general controller is externally connected with a power supply or connected with a storage battery.

[0022] In summary, due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0023] The general controller controls the humidity control module, the atmosphere control module and the temperature control module, so that the environment inside the simulation box can be equivalent to the environment at high altitude in terms of oxygen concentration and humidity in real time, including the change of oxygen concentration, humidity and temperature of the high altitude environment along with the flow of time, so that the simulation of the alternating thermal aging of the stator bar at high altitude is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be described by way of example and with reference to the accompanying drawings, in which:

[0025] Fig. 1 is a structural schematic view of the present application;

[0026] Fig. 2 is a control schematic view of the present application;

[0027] Marked in the figure: 1-simulation box; 2-total controller; 3-stator bar; 41-oxygen concentration sensor; 42-oxygen storage tank; 43-second electromagnetic valve; 44-nitrogen storage tank; 45-first electromagnetic valve; 46-atmosphere controller; 51-humidity sensor; 52-humidifier; 53-third electromagnetic valve; 54-dehumidifier; 55-fourth electromagnetic valve; 56-circulating pump; 57-fifth electromagnetic valve; 58-humidity controller; 61-temperature sensor; 62-semiconductor refrigeration fin; 63-temperature controller; 71-inner stress sensor; 72-stress analysis controller; 81-camera; 82-image processing controller. DETAILED DESCRIPTION

[0028] In the description of the present specification, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product used in the description of the present specification, and are only for the convenience of describing the present specification and simplifying the description, and therefore cannot be understood as limiting the present specification. It is indicated or implied that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present specification.

[0029] In addition, in the description of the present specification, the terms "horizontal", "vertical" and the like do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the present specification, it should also be noted that unless otherwise explicitly specified and limited, if the terms "provided", "installed", "connected", "connected" appear, they should be understood in a broad sense. For example, the connection can be a fixed connection, or a detachable connection, or an integral connection; can be a mechanical connection, or an electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements.

[0031] Example 1

[0032] As shown in Figs. 1-2 A monitoring device for stator bars 3 in a high-altitude environment, comprising a simulation box 1, the simulation box 1 is provided with an expansion port, the expansion port is connected with a humidity control module, an atmosphere control module, a temperature control module, a macroscopic deformation monitoring module, an inner stress monitoring module and a total controller 2; wherein:

[0033] The simulation box 1 is a sealed box body, which is isolated from the outside environment to ensure the stability of the internal environment of the simulation box 1. When monitoring, the stator bar 3 is installed in the simulation box 1. Specifically, an installation table is arranged on the inner wall of the simulation box 1, and the stator bar 3 can be installed on the installation table.

[0034] An atmosphere control module is used to control the oxygen concentration in the simulation box 1. A humidity control module is used to control the humidity in the simulation box 1. A temperature control module is used to control the environmental temperature in the simulation box 1. A macro deformation monitoring module is used to obtain the macro deformation of the stator bar 3 when the stator bar 3 is subjected to alternating thermal aging in the simulation box 1. An internal stress monitoring module is used to obtain the internal stress of the stator bar 3 when the stator bar 3 is subjected to alternating thermal aging in the simulation box 1. A total controller 2 is connected with the humidity control module, the atmosphere control module, the temperature control module, the macro deformation monitoring module and the internal stress monitoring module. That is, the humidity control module, the atmosphere control module and the temperature control module are controlled by the total controller 2, so that the internal environment of the simulation box 1 can be equivalent to the high-altitude environment in real time, including the changes of the air pressure, the oxygen concentration, the humidity and the temperature of the high-altitude environment with the flow of time, so as to realize the simulation of the alternating thermal aging of the stator bar 3 in the high-altitude environment. The deformation of the stator bar 3 when the stator bar 3 is subjected to alternating thermal aging is monitored by the macro deformation monitoring module, and the internal stress of the stator bar 3 when the stator bar 3 is subjected to alternating thermal aging is monitored by the internal stress monitoring module. The alternating thermal aging performance of the stator bar 3 is comprehensively judged by combining the deformation and the internal stress.

[0035] Embodiment 2

[0036] On the basis of embodiment 1, a specific implementation manner is further proposed.

[0037] As to the atmosphere control module, one possible implementation is that the atmosphere control module comprises an oxygen concentration sensor 41, a nitrogen storage tank 44 and an oxygen storage tank 42; the oxygen concentration sensor 41 is installed in the simulation box 1 to obtain the oxygen concentration in the simulation box 1, the nitrogen storage tank 44 is in communication with the inside of the simulation box 1 through a first electromagnetic valve 45, and the oxygen storage tank 42 is in communication with the inside of the simulation box 1 through a second electromagnetic valve 43; the oxygen concentration sensor 41 is connected with the input end of the general controller 2, and the output end of the general controller 2 is connected with the first electromagnetic valve 45 and the second electromagnetic valve 43; the oxygen concentration in the simulation box 1 is obtained through the oxygen concentration sensor 41, and the real-time oxygen concentration is transmitted to the general controller 2 by the oxygen concentration sensor 41, and the general 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 general controller 2 controls the second electromagnetic valve 43 to open, the oxygen in the oxygen storage tank 42 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 general controller 2 controls the first electromagnetic valve 45 to open, the nitrogen in the nitrogen storage tank 44 enters the simulation box 1, and the real-time oxygen concentration in the simulation box 1 decreases to the set oxygen concentration.

[0038] It should be noted that in the atmosphere control module, an atmosphere controller 46 can also be included, the oxygen concentration sensor 41 is connected with the general controller 2 through the atmosphere controller 46, that is, the oxygen concentration sensor 41 transmits the oxygen concentration to the general controller 2 through the atmosphere controller 46, the general controller 2 compares the obtained real-time oxygen concentration with the set oxygen concentration, the comparison result is fed back to the atmosphere controller 46, and the atmosphere controller 46 controls the opening or closing of the first electromagnetic valve 45 and the second electromagnetic valve 43 according to the comparison result, so as to realize the oxygen concentration control in the simulation box 1; the addition of the atmosphere controller 46 can effectively reduce the calculation amount and workload of the general controller 2, thereby reducing the burden of the general controller 2, realizing one-to-one control, and effectively improving the overall service life.

[0039] As to the humidity control module, one possible implementation is that the humidity control module comprises a humidity sensor 51, a humidifier 52, a dehumidifier 54, and a circulating pump 56; the humidity sensor 51 is arranged in the simulation box 1 to obtain the environmental humidity in the simulation box 1; the humidifier 52 is in communication with the inside of the simulation box 1 through a third electromagnetic valve 53; the dehumidifier 54 is in communication with the inside of the simulation box 1 through a fourth electromagnetic valve 55; the inlet of the circulating pump 56 is in communication with the inside of the simulation box 1 through a fifth electromagnetic valve 57; the humidifier 52 and the dehumidifier 54 are connected in parallel to the outlet of the circulating pump 56; the humidity sensor 51 is connected to the input end of the general controller 2; the output end of the general controller 2 is connected to the circulating pump 56, the humidifier 52, the dehumidifier 54, the third electromagnetic valve 53, the fourth electromagnetic valve 55, and the fifth electromagnetic valve 57; the environmental humidity in the simulation box 1 is obtained by the humidity sensor 51, and the humidity sensor 51 transmits the real-time humidity data to the general controller 2; the general 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 general controller 2 controls the fifth electromagnetic valve 57, the third electromagnetic valve 53, and the humidifier 52 to be turned on; the air in the simulation box 1 is circulated by the circulating pump 56, and the circulating path passes through the humidifier 52, so as to increase 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 general controller 2 controls the fifth electromagnetic valve 57, the fourth electromagnetic valve 55, and the dehumidifier 54 to be turned on; the air in the simulation box 1 is circulated by the circulating pump 56, and the circulating path passes through the dehumidifier 54, so as to decrease the real-time humidity data in the simulation box 1 to the set humidity data.

[0040] It should be noted that in the humidity control module, a humidity controller 58 can also be arranged, which has the same working principle and function as the atmosphere controller 46, and will not be described in detail here.

[0041] Regarding the temperature control module, a feasible implementation is that the temperature control module comprises a temperature sensor 61 and a semiconductor refrigeration sheet 62, the temperature sensor 61 is arranged inside the simulation box 1 to obtain the ambient temperature inside the simulation box 1, one end of the semiconductor refrigeration sheet 62 is located inside the simulation box 1, and the other end is located outside the simulation box 1, the temperature sensor 61 is connected with the input end of the general controller 2, and the semiconductor refrigeration sheet 62 is connected with the output end of the general controller 2; the ambient temperature inside the simulation box 1 is obtained through the temperature sensor 61, and the temperature sensor 61 transmits real-time temperature data to the general controller 2, and the general 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 general controller 2 controls the one end of the semiconductor refrigeration sheet 62 located inside the simulation box 1 to heat, the temperature inside the simulation box 1 is increased, so that the real-time temperature data inside the simulation box 1 is increased to the set temperature data; if the real-time temperature data is greater than the set temperature data, the general controller 2 controls the one end of the semiconductor refrigeration sheet 62 located inside the simulation box 1 to cool, the temperature inside the simulation box 1 is decreased, so that the real-time temperature data inside the simulation box 1 is decreased to the set temperature data.

[0042] It should be noted that in the temperature control module, a temperature controller 63 can also be arranged, and the working principle and function of the temperature controller are similar to those of the atmosphere controller 46, and will not be described in detail here.

[0043] Regarding the macro deformation monitoring module, a feasible implementation is that the macro deformation monitoring module comprises a camera 81, the camera 81 is installed on the simulation box 1 and is opposite to the inside of the simulation box 1, the camera 81 is connected with the general controller 2, the photos of the stator bar 3 are continuously taken through the camera 81, and the macro deformation of the stator bar 3 is obtained.

[0044] It should be noted that the camera 81 can be connected with the general controller 2 through an image processing controller 82, the image processing controller 82 processes the photos taken by the camera 81, the processed data is transmitted to the general controller 2 again, the general controller 2 makes data analysis, the calculation amount and workload of the general controller 2 are effectively reduced, the burden of the general controller 2 is reduced, one-to-one control is realized, and the overall life is effectively improved.

[0045] For the internal stress monitoring module, a feasible implementation, the internal stress monitoring module comprises an internal stress sensor 71 capable of being installed on the stator bar 3, and the internal stress sensor 71 is connected with the general controller 2; wherein the internal stress sensor 71 is preferably a pre-embedded sensor, such as a stress sensor of model LM-12, which is a chip-level sensor capable of automatically measuring the magnitude and direction of residual stress. Specifically, when installing the stator bar 3, a hole opener can be used to open a hole on the stator bar 3, and then the internal stress sensor 71 is pre-embedded in the hole; the internal stress sensor 71 can detect the stress change when the stator bar 3 is subjected to alternating thermal aging, and transmit the stress data to the general controller 2; the controller combines the macroscopic deformation of the stator bar 3 to comprehensively judge the alternating thermal aging performance of the stator bar 3.

[0046] It should be noted that the internal stress sensor 71 can be connected to the general controller 2 through the stress analysis controller 72, and the stress analysis controller 72 processes the data transmitted by the internal stress sensor 71 (including noise reduction processing, etc.), and the processed data is transmitted to the general controller 2, and the general controller 2 makes data analysis, effectively reducing the calculation amount and workload of the general controller 2, thereby reducing the burden of the general controller 2, realizing one-to-one control, and effectively improving the overall life.

[0047] Example 3

[0048] Based on any one of the embodiments in examples 1-2, further feasible implementation is proposed.

[0049] 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 or installed in the box body from the box opening, the box door is hinged with the box body, the hinge position is located at the box opening to open and close the box body, and a sealing ring is arranged on the end face of the box door close to the box body, and the surrounding size of the sealing ring is greater than the box opening to realize the sealing of the box opening. The locking of the box door can be locked in a conventional way, such as buckle, snap, etc. to realize the locking of the box door.

[0050] A feasible implementation, the general controller 2 is externally connected with a power supply or connected with a storage battery to obtain continuous power supply.

[0051] A feasible implementation, the general controller 2 can be a PC computer end with a display screen, which can realize the visualization of the environmental data (air pressure, oxygen concentration, humidity, temperature, etc.) in the simulation box 1, the deformation data of the stator bar 3, and the internal stress data.

[0052] The utility model is not limited to the foregoing specific embodiments. The utility model extends to any new feature or any new combination disclosed in the specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A monitoring device for the effect of atmosphere and humidity on the alternating heat aging of stator bars, characterized in that: The system includes a simulation chamber (1), which has an expansion port connected to a humidity control module, an atmosphere control module, a temperature control module, a macroscopic deformation monitoring module, an internal stress monitoring module, and a main 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 bars (3) are installed inside the simulation box (1). An atmosphere control module is used to control the oxygen concentration inside the simulation chamber (1); A humidity control module is used to control the humidity inside the simulation chamber (1); Temperature control module, used to control the ambient temperature inside the simulation chamber (1); The macroscopic deformation monitoring module is used to obtain the macroscopic deformation of the stator bar (3) during alternating thermal aging in the simulation box (1); The internal stress monitoring module is used to obtain the internal stress of the stator bar (3) during alternating thermal aging in the simulation box (1); The main controller (2) is connected to the humidity control module, atmosphere control module, temperature control module, macroscopic deformation monitoring module, and internal stress monitoring module.

2. The monitoring device according to claim 1, characterized in that: The atmosphere control module includes an oxygen concentration sensor (41), a nitrogen storage tank (44), and an oxygen storage tank (42). The oxygen concentration sensor (41) is installed in the simulation chamber (1) to obtain the oxygen concentration in the simulation chamber (1). The nitrogen storage tank (44) is connected to the inside of the simulation chamber (1) through a first solenoid valve (45). The oxygen storage tank (42) is connected to the inside of the simulation chamber (1) through a second solenoid valve (43). The oxygen concentration sensor (41) is connected to the input terminal of the main controller (2). The output terminal of the main controller (2) is connected to the first solenoid valve (45) and the second solenoid valve (43).

3. The monitoring device according to claim 1, characterized in that: The humidity control module includes a humidity sensor (51), a humidifier (52), a dehumidifier (54), and a circulation pump (56). The humidity sensor (51) is installed inside the simulation chamber (1) to obtain the ambient humidity inside the simulation chamber (1). The humidifier (52) is connected to the inside of the simulation chamber (1) through a third solenoid valve (53). The dehumidifier (54) is connected to the inside of the simulation chamber (1) through a fourth solenoid valve (55). The inlet of the circulation pump (56) is connected to the inside of the simulation chamber (1) through a fifth solenoid valve (57). The humidifier (52) and the dehumidifier (54) are connected in parallel to the outlet of the circulation pump (56). The humidity sensor (51) is connected to the input terminal of the main controller (2). The output terminal of the main controller (2) is connected to the circulation pump (56), the humidifier (52), the dehumidifier (54), the third solenoid valve (53), the fourth solenoid valve (55), and the fifth solenoid valve (57).

4. The monitoring device according to claim 1, characterized in that: The temperature control module includes a semiconductor cooling chip (62), one end of which is located inside the simulation chamber (1) and the other end is located outside the simulation chamber (1).

5. The monitoring device according to claim 4, characterized in that: The temperature control module also includes a temperature sensor (61), which is installed inside the simulation chamber (1) to obtain the ambient temperature inside the simulation chamber (1). The temperature sensor (61) is connected to the input terminal of the main controller (2), and the semiconductor cooling chip (62) is connected to the output terminal of the main controller (2).

6. The monitoring device according to claim 1, characterized in that: The macroscopic deformation monitoring module includes a camera (81), which is installed on the simulation box (1) and faces the inside of the simulation box (1). The camera (81) is connected to the main controller (2).

7. The monitoring device according to claim 1, characterized in that: The internal stress monitoring module includes an internal stress sensor (71) that can be installed on the stator bar (3), and the internal stress sensor (71) is connected to the main controller (2).

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

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

10. The monitoring device according to claim 1, characterized in that: It also has an atmosphere controller (46), a humidity controller (58), a temperature controller (63), an image processing controller (82), and a stress analysis controller (72). The atmosphere control module is connected to the main controller (2) through the atmosphere controller (46), the humidity control module through the humidity controller (58), the temperature control module through the temperature controller (63), the macroscopic deformation monitoring module through the image processing controller (82), and the internal stress monitoring module through the stress analysis controller (72).

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