Device for monitoring alternating thermal aging effect of air pressure on stator bar

Abstract

The utility model discloses a device for monitoring the alternating thermal aging effect of air pressure 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 air pressure control module is used for controlling the air pressure 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 air pressure condition of 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 the alternating thermal aging effect of air pressure on stator bar. 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 stator bar is applied in high altitude extreme environment, and strict requirements are put forward for the stability of generator stator bar insulation, for example, the main insulation of stator bar may be subjected to alternating thermal aging effect for a long time during operation, which may 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 integrity performance under different test periods through alternating thermal aging test to evaluate whether insulation has defects such as delamination or shell separation, and this detection method has the following problems: 1) the existing alternating thermal stress test is carried out at conventional altitude, but the air pressure in high altitude environment is different from that in conventional altitude, and the deterioration development process of insulation material has great difference, 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 the alternating thermal aging effect in the high altitude air pressure environment is an important problem to be solved. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems, provides a monitoring device of the alternating thermal aging effect of air pressure on stator bar to solve the problem that the whole cycle performance of the generator stator bar insulation under the alternating thermal aging effect in the air pressure condition of high altitude environment is not effectively monitored in the prior art.

[0005] The utility model adopts the technical scheme as follows: a monitoring device of the alternating thermal aging effect of air pressure on stator bar, including simulation box, the simulation box is provided with expansion port, expansion port is connected with air pressure 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 inside of the box body from the outside environment, and when monitoring, the stator bar is installed in the simulation box.

[0007] an air pressure control module for controlling air pressure in the simulation box;

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

[0009] a macroscopic deformation monitoring module for obtaining macroscopic deformation of the stator bar when the stator bar is subjected to alternating thermal aging in the simulation box;

[0010] an internal stress monitoring module for obtaining internal stress of the stator bar when the stator bar is subjected to alternating thermal aging in the simulation box;

[0011] a total controller connected with the air pressure control module, the temperature control module, the macroscopic deformation monitoring module and the internal stress monitoring module.

[0012] Further, the air pressure control module has a compressed air tank and a vacuum pump; the air inlet end of the vacuum pump and the air outlet end of the compressed air tank are both in communication with the inside of the simulation box.

[0013] Further, the air pressure control module further has an air pressure sensor installed in the simulation box for obtaining air pressure in the simulation box; the vacuum pump is in communication with the inside of the simulation box through a first electromagnetic valve, and the compressed air tank is in communication with the inside of the simulation box through a second electromagnetic valve; the air pressure sensor is connected with the input end of the total controller, and the output end of the total controller is connected with the vacuum pump, the first electromagnetic valve and the second electromagnetic valve.

[0014] Further, the temperature control module has a semiconductor refrigeration sheet, one end of the semiconductor refrigeration sheet being located in the simulation box and the other end being located outside the simulation box.

[0015] Further, the temperature control module further has a temperature sensor arranged in the inside of the simulation box for obtaining ambient temperature in the simulation box; the temperature sensor is connected with the input end of the total controller, and the semiconductor refrigeration sheet is connected with the output end of the total controller.

[0016] Further, the macroscopic deformation monitoring module includes a camera installed on the simulation box and facing the inside of the simulation box; the camera is connected with the total controller.

[0017] Further, the internal stress monitoring module includes an internal stress sensor capable of being installed on the stator bar; the internal stress sensor is connected with the total controller.

[0018] 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 arranged on the end face of the box door close to the box body.

[0019] Further, the total controller is externally connected with a power supply or connected with a storage battery.

[0020] Further, the air pressure controller, the temperature controller, the image processing controller and the stress analysis controller are further provided, the air pressure control module is connected with the total controller through the air pressure controller, the temperature control module is connected with the total controller through the temperature controller, the macro deformation monitoring module is connected with the total controller through the image processing controller, and the internal stress monitoring module is connected with the total controller through the stress analysis controller.

[0021] In conclusion, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

[0022] The total controller controls the air pressure control module and the temperature control module, so that the environment in the simulation box can be equivalent to the environment at high altitude in real time in terms of air pressure and temperature, that is, the change of the air pressure and the temperature of the high altitude environment along with the time flow, so that the simulation of the alternating thermal aging of the stator bar at high altitude is realized; the macro deformation monitoring module monitors the deformation of the stator bar when the alternating thermal aging occurs, the internal stress monitoring module monitors the internal stress of the stator bar when the alternating thermal aging occurs, and the alternating thermal aging performance of the stator bar is comprehensively judged in combination with the deformation and the internal stress. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be explained by example and with reference to the accompanying drawings, in which:

[0024] Fig. 1 It is a structural schematic view of the utility model;

[0025] Fig. 2 It is a control schematic view of the utility model;

[0026] Marked in the drawing: 1-simulation box; 2-total controller; 3-stator bar; 41-air pressure sensor; 42-vacuum pump; 43-first electromagnetic valve; 44-compressed air tank; 45-second electromagnetic valve; 46-air pressure controller; 51-temperature sensor; 52-semiconductor refrigeration piece; 53-temperature controller; 61-internal stress sensor; 62-stress analysis controller; 71-video camera; 72-image processing controller. DETAILED DESCRIPTION

[0027] 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 appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawing, or the orientation or position relationship of the product in use of the specification, which is only for the convenience of describing the specification and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the specification.

[0028] In addition, in the description of the specification, if the terms "horizontal", "vertical" and the like appear, it does not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. As "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the specification, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense. For example, the connection can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements.

[0030] Embodiment 1

[0031] As Figs. 1-2 shown, a monitoring device for stator bars 3 in a high-altitude environment includes an analog box 1, the analog box 1 is provided with an expansion port, the expansion port is connected with a gas pressure control module, a temperature control module, a macroscopic deformation monitoring module, an internal stress monitoring module and a total controller 2; wherein:

[0032] The analog box 1 is a sealed box body, which isolates the inside of the box body from the outside environment to ensure the stability of the environment inside the analog box 1; when monitoring, the stator bars 3 are installed in the analog box 1; specifically, the inner wall of the analog box 1 is provided with an installation table, and the stator bars 3 can be installed on the installation table.

[0033] The gas pressure control module is used to control the gas pressure in the analog box 1; the temperature control module is used to control the environmental temperature in the analog box 1; the macroscopic deformation monitoring module is used to obtain the macroscopic deformation of the stator bars 3 when the stator bars 3 occur alternating thermal aging in the analog box 1; the internal stress monitoring module is used to obtain the internal stress of the stator bars 3 when the stator bars 3 occur alternating thermal aging in the analog box 1; the total controller 2 is connected with the gas pressure control module, the temperature control module, the macroscopic deformation monitoring module and the internal stress monitoring module. That is, the total controller 2 controls the gas pressure control module and the temperature control module, so that the environment inside the analog box 1 can be in real time equivalent to the environment in high altitude, including the change of the gas pressure 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 bars 3 in the high-altitude environment; the deformation of the stator bars 3 when the stator bars 3 occur alternating thermal aging is monitored by the macroscopic deformation monitoring module, and the internal stress of the stator bars 3 when the stator bars 3 occur alternating thermal aging is monitored by the internal stress monitoring module. The alternating thermal aging performance of the stator bars 3 is comprehensively judged by combining the deformation and the internal stress.

[0034] Embodiment 2

[0035] On the basis of embodiment 1, further specific embodiments are proposed.

[0036] Regarding the air pressure control module, one possible embodiment 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 air pressure in the simulation box 1, the vacuum pump 42 is in communication with the inside of the simulation box 1 through the first electromagnetic valve 43, and the compressed air tank 44 is in communication with the inside of the simulation box 1 through the second electromagnetic valve 45; the air pressure sensor 41 is connected to the input end of the general controller 2, and the output end of the general controller 2 is connected to the vacuum pump 42, the first electromagnetic valve 43 and the second electromagnetic valve 45; the air pressure in the simulation box 1 is obtained through the air pressure sensor 41, and the air pressure sensor 41 transmits the real-time air pressure to the general controller 2, and the general controller 2 compares the real-time air pressure with the set air pressure; if the real-time air pressure is less than the set air pressure, the general controller 2 controls the second electromagnetic valve 45 to open, the air in the compressed air tank 44 enters the simulation box 1, and the real-time air pressure in the simulation box 1 increases to the set air pressure; if the real-time air pressure is greater than the set air pressure, the general controller 2 controls the first electromagnetic valve 43 to open, and controls the vacuum pump 42 to open at the same time, the vacuum pump 42 extracts the air in the simulation box 1, and the real-time air pressure in the simulation box 1 decreases to the set air pressure.

[0037] It should be noted that in the air pressure control module, an air pressure controller 46 can also be included, the air pressure sensor is connected to the general controller 2 through the air pressure controller 46, that is, the air pressure sensor transmits the air pressure to the general controller 2 through the air pressure controller 46, the general controller 2 compares the obtained real-time air pressure with the set air pressure, the comparison result is fed back to the air pressure controller 46, and the air pressure controller 46 controls the opening or closing of the vacuum pump 42, the first electromagnetic valve 43 and the second electromagnetic valve 45 according to the comparison result, so as to realize the air pressure control in the simulation box 1; the addition of the air pressure 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.

[0038] Regarding the temperature control module, a feasible implementation is that the temperature control module comprises a temperature sensor 51 and a semiconductor refrigeration sheet 52, the temperature sensor 51 is arranged inside the simulation box 1 to obtain the ambient temperature inside the simulation box 1, one end of the semiconductor refrigeration sheet 52 is located inside the simulation box 1, and the other end is located outside the simulation box 1, the temperature sensor 51 is connected with the input end of the general controller 2, and the semiconductor refrigeration sheet 52 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 51, and the temperature sensor 51 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 52 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 52 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.

[0039] It should be noted that in the temperature control module, a temperature controller 53 can also be arranged, and 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.

[0040] Regarding the macro deformation monitoring module, a feasible implementation is that the macro deformation monitoring module comprises a camera 71, the camera 71 is installed on the simulation box 1 and is opposite to the inside of the simulation box 1, the camera 71 is connected with the general controller 2, the photos of the stator bar 3 are continuously taken through the camera 71, and the macro deformation of the stator bar 3 is obtained.

[0041] It should be noted that the camera 71 can be connected with the general controller 2 through an image processing controller 72, the image processing controller 72 processes the photos taken by the camera 71, 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.

[0042] For the internal stress monitoring module, a feasible implementation, the internal stress monitoring module comprises an internal stress sensor 61 capable of being installed on the stator bar 3, and the internal stress sensor 61 is connected with the general controller 2; wherein the internal stress sensor 61 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 61 is pre-embedded in the hole; the internal stress sensor 61 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.

[0043] It should be noted that the internal stress sensor 61 can be connected to the general controller 2 through the stress analysis controller 62, and the stress analysis controller 62 processes the data transmitted by the internal stress sensor 61 (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.

[0044] Example 3

[0045] Based on any one of the embodiments in examples 1-2, further feasible embodiments are proposed.

[0046] 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, hasp and the like to realize the locking of the box door.

[0047] 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.

[0048] 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, temperature and the like) in the simulation box 1, the deformation data of the stator bar 3 and the internal stress data.

[0049] 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 device for monitoring the effect of barometric pressure on the thermal aging of stator bars, characterized by: The simulation box (1) is provided with an expansion port, and a gas pressure control module, a temperature control module, a macroscopic deformation monitoring module, an internal stress monitoring module and a total controller (2) are connected to the expansion port. The simulation box (1) is a sealed box body, which isolates the inside of the box body from the outside environment. The gas pressure control module is used for controlling the gas pressure in the simulation box (1). The temperature control module is used for controlling the environmental temperature in the simulation box (1). The macroscopic deformation monitoring module is used for obtaining the macroscopic deformation of the stator bar (3) when the stator bar (3) is subjected to alternating thermal aging in the simulation box (1). The internal stress monitoring module is used for obtaining the internal stress of the stator bar (3) when the stator bar (3) is subjected to alternating thermal aging in the simulation box (1). The total controller (2) is connected to the gas pressure control module, the temperature control module, the macroscopic deformation monitoring module and the internal stress monitoring module.

2. The monitoring device of claim 1, wherein: The gas pressure control module has a compressed air tank (44) and a vacuum pump (42).

3. The monitoring device of claim 2, wherein: The vacuum pump (42) and the compressed air tank (44) are both in communication with the inside of the simulation box (1).

4. The monitoring device of claim 1, wherein: The temperature control module has a semiconductor refrigeration sheet (52), one end of which is located in the simulation box (1) and the other end of which is located outside the simulation box (1).

5. The monitoring device of claim 4, wherein: The temperature control module also has a temperature sensor (51) arranged in the simulation box (1) for obtaining the environmental temperature in the simulation box (1).

6. The monitoring device of claim 1, wherein: The macroscopic deformation monitoring module includes a camera (71) installed on the simulation box (1) and facing the inside of the simulation box (1).

7. The monitoring device of claim 1, wherein: The internal stress monitoring module includes an internal stress sensor (61) capable of being installed on the stator bar (3).

8. The monitoring device of claim 1, wherein: The simulation box (1) 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 face of the box door close to the box body.

9. The monitoring device of claim 1, wherein: The total controller (2) is connected to an external power supply or a storage battery.

10. The monitoring device of claim 1, wherein: The gas pressure controller (46), the temperature controller (53), the image processing controller (72) and the stress analysis controller (62) are also provided, and the gas pressure control module, the temperature control module, the macroscopic deformation monitoring module and the internal stress monitoring module are connected with the general controller (2) respectively through the gas pressure controller (46), the temperature controller (53), the image processing controller (72) and the stress analysis controller (62).

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