CN117214707A - Accelerated degradation testing method and system for motor stator winding - Google Patents
Accelerated degradation testing method and system for motor stator winding Download PDFInfo
- Publication number
- CN117214707A CN117214707A CN202311422321.6A CN202311422321A CN117214707A CN 117214707 A CN117214707 A CN 117214707A CN 202311422321 A CN202311422321 A CN 202311422321A CN 117214707 A CN117214707 A CN 117214707A
- Authority
- CN
- China
- Prior art keywords
- stator winding
- state
- change
- over switch
- reactance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 212
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 111
- 238000012360 testing method Methods 0.000 title claims abstract description 98
- 230000015556 catabolic process Effects 0.000 title claims abstract description 94
- 230000005284 excitation Effects 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000004088 simulation Methods 0.000 claims description 68
- 238000009413 insulation Methods 0.000 claims description 66
- 238000001514 detection method Methods 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The application relates to a motor stator winding accelerated degradation testing method. The method comprises the following steps: placing a motor stator in a temperature control box; through the through hole of the temperature control box, the first end of the stator winding of the motor stator is correspondingly connected with the first end of the analog link, and the second end of the stator winding is correspondingly connected with the first end of the change-over switch; respectively adjusting the rotor simulated reactance, the rotor simulated resistance and the excitation simulated reactance to the rotor reactance, the rotor resistance and the excitation reactance of the stator winding in the rated power running state; adjusting the temperature of the temperature control box to a target temperature; and under the condition that the temperature of the temperature control box is at the target temperature, the circulation execution control change-over switch is in a first state, the change-over switch is controlled to be switched from the first state to a second state, and degradation test electrical parameters of the change-over switch in the second state are collected until the end condition is met. The method can truly reflect the actual motor stator winding degradation process.
Description
Technical Field
The application relates to the technical field of motors, in particular to a method and a system for testing accelerated degradation of a motor stator winding.
Background
With the development of industrial production, the motor is used as core equipment of a system, and the safe and reliable operation of the whole system is of a crucial importance, wherein the stator turn-to-turn short circuit fault is one of common faults of the motor.
In order to reduce the influence caused by sudden faults, prediction of the service life of a motor winding is mostly adopted, and the possible occurrence time of the faults is obtained in advance to provide basis for maintenance work. To predict the life of the motor winding, it is necessary to track the degradation process of the motor winding and monitor the key parameters during the degradation process of the motor winding.
At present, a simulated degradation process of a motor stator winding is mostly adopted to obtain parameters of the degradation process, however, the actual degradation process of the stator winding cannot be truly reflected by the current simulation method.
Disclosure of Invention
Based on the above, it is necessary to provide a method and a system for testing accelerated degradation of a motor stator winding, which can truly reflect the degradation process of an actual motor stator winding.
In a first aspect, the present application provides a method for testing accelerated degradation of a stator winding of an electric machine, the method comprising:
placing a motor stator in a temperature control box; the motor stator comprises a stator winding, a stator core and a stand;
through the through hole of the temperature control box, the first end of the stator winding is correspondingly connected with the first end of the analog link, and the second end of the stator winding is correspondingly connected with the first end of the change-over switch; the rotor analog reactance, the rotor analog resistor and the excitation analog reactance are sequentially connected in series between the first end and the second end of each analog link, the connection point of the rotor analog resistor and the excitation analog reactance is used for being connected with a power supply, the second end of the change-over switch is connected with the second end of the analog link, the third end of the change-over switch is correspondingly connected with the first acquisition end of the detection assembly, and the controlled end of the change-over switch is connected with the control end of the detection assembly;
adjusting the rotor simulation reactance to the rotor reactance of the stator winding in the rated power operation state, and the rotor simulation resistance to the rotor resistance of the stator winding in the rated power operation state, and the excitation simulation reactance to the excitation reactance of the stator winding in the rated power operation state;
adjusting the temperature of the temperature control box to a target temperature; the target temperature is the temperature required by the accelerated degradation test of the stator winding;
under the condition that the temperature of the temperature control box is at the target temperature, circularly executing the control change-over switch to be in a first state, controlling the change-over switch to be switched from the first state to a second state, and collecting degradation test electric parameters of the change-over switch in the second state until the end condition is met; the ending condition includes the degradation test electrical parameter being greater than a cut-off threshold value of the test setting; the degradation test electrical parameter is used for representing the degradation degree of the stator winding, the first end and the second end of the change-over switch are conducted in the first state, and the first end and the third end of the change-over switch are conducted in the second state.
In one embodiment, controlling the change-over switch to switch from the first state to the second state includes:
the change-over switch is controlled to be switched from the first state to the second state at preset time intervals.
In one embodiment, the detection assembly includes a data collector and an insulation resistance meter; the control end of the data acquisition unit is connected with the controlled end of the change-over switch, the first end of the insulation resistance meter is correspondingly connected with the third end of the change-over switch, the second end of the insulation resistance meter is connected with the first acquisition end of the data acquisition unit, the method comprises the following steps:
the change-over switch is controlled by the data collector to be switched from the first state to the second state, so that the insulation resistance meter collects the insulation resistance value of the stator winding.
In one embodiment, in the case that the stator winding is a three-phase stator winding, the detection assembly includes a current sensor, the current sensor is correspondingly disposed between the second end of the switch on each analog link and the second end of the analog link, and an output end of the current sensor is connected to the second collecting end of the data collector, and the method further includes:
and controlling the current sensor to collect the current of the stator winding when the change-over switch is in the first state.
In a second aspect, the present application also provides a system for testing accelerated degradation of a stator winding of an electric machine, the system comprising:
the temperature control box is used for accommodating the motor stator and providing a target temperature which is the temperature required by the accelerated degradation test of the stator winding; the motor stator comprises a stator winding, a stator core and a stand;
the rotor simulation reactance, the rotor simulation resistor and the excitation simulation reactance are sequentially connected in series between the first end and the second end of each simulation link, the connection point of the rotor simulation resistor and the excitation simulation reactance is used for being connected with a power supply, and the first end of the simulation link is used for being correspondingly connected with the first end of the stator winding; the rotor simulation reactance is used for simulating the rotor reactance of the stator winding in the rated power operation state, the rotor simulation resistance is used for simulating the rotor resistance of the stator winding in the rated power operation state, and the excitation simulation reactance is used for simulating the excitation reactance of the stator winding in the rated power operation state;
the first end of the change-over switch is used for being correspondingly connected with the second end of the stator winding, and the second end of the change-over switch is correspondingly connected with the second end of the analog link;
the detection assembly is connected with the first acquisition end of the detection assembly and the third end of the change-over switch correspondingly, and the control end of the detection assembly is connected with the controlled end of the change-over switch;
the detection component is used for circularly executing the control of the change-over switch to be in a first state and controlling the change-over switch to be switched from the first state to a second state under the condition that the temperature of the temperature control box is at a target temperature, and collecting degradation test electric parameters of the change-over switch in the second state until an end condition is met; the ending condition includes the degradation test electrical parameter being greater than a cut-off threshold value of the test setting; the degradation test electrical parameter is used for representing the degradation degree of the stator winding, the first end and the second end of the change-over switch are conducted in the first state, and the first end and the third end of the change-over switch are conducted in the second state.
In one embodiment, the detecting component is configured to control the change-over switch to switch from the first state to the second state at a preset time interval.
In one embodiment, the detection assembly includes:
the control end of the data acquisition unit is connected with the controlled end of the change-over switch;
the first end of the insulation resistance instrument is correspondingly connected with the third end of the change-over switch, and the second end of the insulation resistance instrument is connected with the first acquisition end of the data acquisition device;
the data acquisition device is used for controlling the change-over switch to be switched from a first state to a second state so that the insulation resistance meter acquires the insulation resistance value of the stator winding.
In one embodiment, in the case where the stator winding is a three-phase stator winding, the detection assembly further includes:
the current sensor is correspondingly arranged between the second end of the change-over switch on each analog link and the second end of the analog link, the output end of the current sensor is connected with the second acquisition end of the data acquisition device, and the current sensor is used for acquiring the current of the stator winding when the change-over switch is in the first state.
In one embodiment, the system further comprises:
the first end of the circuit breaker is correspondingly connected with a connecting point of the rotor simulation resistor and the excitation simulation reactor, and the second end of the circuit breaker is used for being connected with a power supply.
In one embodiment, one or more of the transfer switch, the rotor analog reactance, the rotor analog resistance, the excitation analog reactance, and the detection assembly are disposed outside of the temperature control box.
The method and the system for testing the accelerated degradation of the motor stator winding have the following beneficial effects:
the temperature control box provides relatively constant test environment temperature, the motor stator winding is independently taken out from the whole motor and is placed in the temperature control box for test, the problem that other components are damaged first to influence degradation test accuracy due to excessive extreme conditions is avoided, and the degradation speed of the stator winding is accelerated and is not interfered by the damage of other components. Secondly, by accessing a simulation link comprising an excitation simulation reactance, a rotor simulation reactance and a rotor simulation resistance, the accessed excitation simulation reactance value, the rotor simulation reactance value and the rotor simulation resistance value are adjusted, the rated working state of the motor in operation is truly simulated, the degradation process of the motor winding is more approximate to the actual situation, and the accelerated degradation test of the motor stator winding is realized by combining a change-over switch and a detection assembly, so that the performance and the degradation degree of the motor stator winding are more accurately evaluated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a system for testing accelerated degradation of a stator winding of an electric machine in one embodiment;
FIG. 2 is a schematic diagram of a three-phase motor stator winding accelerated degradation testing system in one embodiment;
FIG. 3 is a schematic diagram of the connection of an analog resistor and a reactance in a Y-type three-phase asynchronous motor stator winding according to an embodiment;
fig. 4 is a flow chart of a method of accelerated degradation testing of a stator winding of an electric machine in one embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
Spatially relative terms, such as "under", "below", "beneath", "under", "above", "over" and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
As described in the background art, the motor is currently used as a device for converting electric energy into mechanical energy in industrial production and daily life. As a key or core device of the system, the motor plays a critical role in the safe and reliable operation of the whole system. However, the motor is generally in a continuous running state for a long time, the working condition environment is severe, and a plurality of key components are degraded and fail under the action of electric, thermal, mechanical and other stresses. Among them, the stator turn-to-turn short circuit fault is one of the common faults of the motor. The voltage surge, the damp and hot environment and the high temperature of the stator can degrade the insulating layer of the stator winding, thereby causing turn-to-turn short circuit faults of the stator and damaging the symmetry of the motor winding until the motor is burnt.
In order to reduce the influence caused by sudden faults, the best method is to predict the service life of the motor winding, and the possible occurrence time of the faults is obtained in advance to provide basis for maintenance work. To achieve life prediction of the motor windings, it is at least necessary to track the degradation process of the motor windings, during which critical parameters are monitored. However, the normal degradation period of the motor winding is generally 5-30 years, and the normal degradation time is too long. In this case, a method of accelerating degradation is generally employed. It is common practice to increase the operating voltage and temperature of the windings, but for the motor as a whole, components other than the windings cannot be subjected to such operating conditions for a long period of time, and the conditions are too extreme to cause the other components to be damaged first. Therefore, there is a need for a suitable solution that accelerates the degradation rate of the winding without interference from other component damage and monitors critical parameters of the winding during degradation.
In the prior art, the degradation process of the turn-to-turn short circuit fault of the motor stator is generally simulated in a simulation mode. However, the simulation accuracy is limited by adopting a mode of establishing a simulation model to simulate the inter-turn insulation degradation process of the motor stator winding, and the model iteration within a few seconds can possibly reflect the actual motor stator state change relatively closely. However, once the simulation time is too long, and even only a motor operation process of a few minutes is simulated, iteration errors of the simulation model are accumulated continuously, so that the simulation model is gradually deviated from the actual situation greatly. For the motor stator degradation process which lasts for years, the result of the simulation model is necessarily inaccurate, and the actual stator winding degradation process cannot be truly reflected.
For the above reasons, in one exemplary embodiment, as shown in fig. 1, the present application provides a motor stator winding accelerated degradation testing system, comprising: a temperature control box 2, an analog link 4, a change-over switch 6 and a detection assembly 8. The temperature control box 2 is used for accommodating the motor stator 5 and providing a target temperature, wherein the target temperature is the temperature required by the accelerated degradation test of the stator winding 52; the motor stator 5 comprises a stator winding 52, a stator core and a stand; a rotor analog reactance 42, a rotor analog resistor 44 and an excitation analog reactance 46 are sequentially connected in series between a first end and a second end of each analog link 4, a connection point of the rotor analog resistor 44 and the excitation analog reactance 46 is used for being connected to the power supply 7, and the first end of the analog link 4 is used for being correspondingly connected with a first end of the stator winding 52; wherein, the rotor simulation reactance 42 is used for simulating the rotor reactance of the stator winding 52 in the rated power operation state, the rotor simulation resistance 44 is used for simulating the rotor resistance of the stator winding 52 in the rated power operation state, and the excitation simulation reactance 46 is used for simulating the excitation reactance of the stator winding 52 in the rated power operation state; the first end of the change-over switch 6 is used for being correspondingly connected with the second end of the stator winding 52, and the second end of the change-over switch 6 is correspondingly connected with the second end of the analog link 4; the first acquisition end of the detection component 8 is correspondingly connected with the third end of the change-over switch 6, and the control end of the detection component 8 is connected with the controlled end of the change-over switch 6; the detection component 8 is used for circularly executing the control of the change-over switch 6 to be in a first state and controlling the change-over switch 6 to be switched from the first state to a second state under the condition that the temperature of the temperature control box is at a target temperature, and collecting degradation test electrical parameters of the change-over switch 6 in the second state until an end condition is met; the ending condition includes the degradation test electrical parameter being greater than a cut-off threshold value of the test setting; the degradation test electrical parameter is used to characterize the degree of degradation of the stator winding 52, the first and second ends of the switch 6 in the first state being conductive, and the first and third ends of the switch 6 in the second state being conductive.
The temperature control box 2 is used for accommodating the stator windings 52 of the motor stator 5 and providing the required ambient temperature to simulate various temperature conditions of the motor in actual operation. The means for realizing the environmental temperature described in the degradation test is not limited to the temperature control box 2, and may be any means that can provide an appropriate temperature for the degradation test of the stator winding 52, for example, heat conduction oil may be used to directly heat the stator winding 52, or a temperature required for accelerating the degradation may be used. The analog link 4 may be a circuit composed of a series of electrical components, and is used to simulate various electrical parameters of the motor (such as, but not limited to, rotor reactance, rotor resistance and excitation reactance of the motor) in the rated power operation state, and it should be noted that, according to different test requirements and simulation scene requirements, different reactance resistors in series-parallel connection modes may be added in the loop of the stator winding 52 to realize the simulation of the motor stator winding working in the rated working state, which is not limited herein. The switch 6 may refer to an electronic component for switching a circuit connection between different test states; for example, the switch 6 may be a multi-circuit low-voltage switch, in which a plurality of moving contacts are overlapped and welded on a shaft, and the moving contacts are sequentially connected or disconnected with the fixed contacts when the shaft rotates, so that the circuit is changed from one group of connections to another. The detection component 8 refers to a device for acquiring a degradation testing electrical parameter after the change-over switch 6 is switched from the first state to the second state. Degradation testing electrical parameters including, but not limited to, current, voltage, power factor, insulation resistance value, and the like are used to characterize the degree of degradation of the stator winding 52.
Illustratively, after the motor stator 5 is placed in the temperature control box 2, the first end of the stator winding 52 in the motor stator 5 is correspondingly connected with the first end of the analog link 4, and the second end of the stator winding 52 is correspondingly connected with the first end of the switch 6 through the through hole of the temperature control box 2; a rotor analog reactance 42, a rotor analog resistor 44 and an excitation analog reactance 46 are sequentially connected in series between a first end and a second end of each analog link 4, a connection point of the rotor analog resistor 44 and the excitation analog reactance 46 is used for being connected with a power supply 7, a second end of a change-over switch 6 is connected with a second end of the analog link 4, a third end of the change-over switch 6 is correspondingly connected with a first acquisition end of a detection assembly 8, and a controlled end of the change-over switch 6 is connected with a control end of the detection assembly 8; the rotor simulation reactance 42 to the rotor reactance of the stator winding 52 in the rated power operation state, the rotor simulation resistance 44 to the rotor resistance of the stator winding 52 in the rated power operation state, and the excitation simulation reactance 46 to the excitation reactance of the stator winding 52 in the rated power operation state are adjusted so that the stator winding 52 operates at the rated power and the rated current after the power supply 7 is turned on. Adjusting the temperature of the temperature control box 2 to a target temperature; the target temperature is the temperature required for the stator winding 52 to accelerate the degradation test, e.g., 125 ℃; it should be noted that the temperature required for accelerating the degradation test may be set according to the degradation test and the simulation requirement. Controlling the first and second terminals of the change-over switch 6 to be conductive so that the stator winding 52, the analog link 4 and the power supply 7 form a test loop and the stator winding 52 operates at a rated power at a target temperature; after the stator winding 52 operates at the rated power for a period of time at the target temperature, the first end and the second end of the change-over switch 6 are controlled to be disconnected, the first end and the third end are controlled to be connected, the detection component 8 and the stator winding 52 are connected, degradation test electrical parameters of the stator winding 52 at the moment are collected, so that the degradation degree of the stator winding 52 is known, and the degradation test is ended until the degradation test electrical parameters are larger than a cut-off threshold value set by the test.
In the above embodiment, the temperature control box 2 provides a relatively constant test environment temperature, and the stator winding of the motor is independently taken out from the whole motor and placed in the temperature control box 2 for testing, so that the problem that other components are damaged first to influence the accuracy of degradation test due to excessively extreme conditions is avoided, and the degradation speed of the stator winding 52 is accelerated and is not interfered by the damage of other components. Secondly, by accessing the simulation link 4 comprising the excitation simulation reactance 46, the rotor simulation reactance 42 and the rotor simulation resistance 44, the value of the accessed excitation simulation reactance 46, the value of the rotor simulation reactance 42 and the value of the rotor simulation resistance 44 are adjusted, the rated working state of the motor in operation is truly simulated, the degradation process of the motor winding is more approximate to the actual situation, and the accelerated degradation test of the motor stator winding is realized by combining the change-over switch 6 and the detection assembly 8, so that the performance and the degradation degree of the motor stator winding are more accurately estimated.
In an exemplary embodiment, the detection component 8 is configured to control the change-over switch 6 to switch from the first state to the second state at preset time intervals.
Wherein the preset time interval may be a specified period of time, such as every second, minute, hour or longer. This time interval may be selected according to the requirements of the test, for example, if the test requires more frequent switching of the switch 6 state to obtain more data, the preset time interval may be set to a smaller value. In one implementation, the predetermined time interval is every 24 hours. I.e. every 24 hours, the detection assembly 8 controls the change-over switch 6 to disconnect the loop formed by the stator winding 52 and the analog link 4, and to conduct the detection assembly 8 with the stator winding 52 so as to collect the degradation test electrical parameters of the stator winding 52. In addition, in the degradation test process, when the acquired degradation test electrical parameter changes to be smaller than the cut-off threshold value set by the test, the preset time interval may be set to be, for example, every 2 hours, to more accurately know the degradation degree of the stator winding 52.
In the above embodiment, by controlling the change-over switch 6 to switch from the first state to the second state within a preset time interval, it is ensured that the electrical performance of the stator winding 52 is sufficiently simulated and detected during the test. Meanwhile, the preset time interval can also facilitate data processing and analysis, as the same time interval can ensure the consistency and comparability of the data.
In one exemplary embodiment, as shown in fig. 2, the detection assembly 8 includes: a data collector 82 and an insulation resistance meter 84. The control end of the data collector 82 is connected with the controlled end of the change-over switch 6; a first end of the insulation resistance meter 84 is connected with a third end of the change-over switch 6, and a second end of the insulation resistance meter 84 is connected with a first acquisition end of the data acquisition device 82; the data collector 82 is configured to control the change-over switch 6 to change from the first state to the second state, so that the insulation resistance meter 84 collects the insulation resistance value of the stator winding 52. Wherein, the data collector 82 is configured to control the change-over switch 6 to change from the first state to the second state, so that the insulation resistance meter 84 collects the insulation resistance value of the stator winding 52.
The data collector 82 may be a device or apparatus for acquiring and processing data, and is connected to the controlled end of the switch 6 to control the switch 6 to switch from the first state to the second state. Insulation resistance meter 84 the insulation resistance meter 84 is a device for measuring insulation resistance, and is a device suitable for measuring resistance values of various insulation materials and insulation resistance of transformers, motors, cables, electrical equipment, and the like. It should be noted that the insulation resistance value of the stator winding 52 may represent the insulation degree of the stator winding 52 to the casing, and in a multi-phase motor such as a three-phase motor, the insulation degree between each phase winding in the three-phase stator winding 52 may also be represented.
Illustratively, after the stator winding 52 has been operating at the target temperature at the rated power for a period of time, the data collector 82 disconnects the stator winding 52 from the analog link 4 by controlling the change-over switch 6 and turns on the insulation resistance meter 84 and the stator winding 52 such that the insulation resistance meter 84 collects and transmits the insulation resistance value of the stator winding 52 to the data collector 82. For a single-phase motor, a tester can know the insulation degree of the single-phase stator winding 52 to the machine shell through the collected insulation resistance value, and for a multi-phase motor such as a three-phase motor, the tester can also know the insulation degree among the windings of each phase through the collected insulation resistance value. By comparing the collected insulation resistance value with the cut-off threshold value set by the test, if the insulation resistance value is smaller than the cut-off threshold value set by the test, the risk of short circuit of the stator winding 52 is indicated, that is, the stator winding 52 has been degraded, that is, the degradation test is completed, and the loop of the stator winding 52 can be disconnected by the change-over switch 6.
In the above embodiment, through the cooperation of the insulation resistance meter 84 and the data collector 82, the insulation resistance value is changed in the degradation testing process of the stator winding 52, so as to know the degradation degree of the stator winding 52, realize automatic detection, and improve the accuracy and efficiency of detection.
In an exemplary embodiment, as shown in fig. 2, in the case where the stator winding 52 is a three-phase stator winding 52, the detection assembly 8 further includes:
the current sensor is correspondingly arranged between the second end of the change-over switch 6 on each analog link 4 and the second end of the analog link 4, the output end of the current sensor is connected with the second collecting end of the data collector 82, and the current sensor is used for collecting the current of the stator winding 52 when the change-over switch 6 is in the first state.
The current sensor is an ac current sensor, and the current sensor detects the current of the stator winding 52 in the testing process, so as to obtain parameters such as a current effective value, current unbalance degree, and the like. As shown in fig. 2, the three-phase stator winding 52 includes a U-phase winding, a V-phase winding, and a W-phase winding, and a current sensor is disposed at the second end of the analog link 4 to which each phase winding is correspondingly connected.
Illustratively, the three-phase stator winding may be a Y-type three-phase asynchronous motor stator winding as shown in fig. 3. In the degradation test process, under the condition that the change-over switch 6 is in the first state, the current sensor collects and sends the current of each phase winding to the data collector 82, the data collector 82 determines the current effective value based on the collected current of each phase winding, and determines the three-phase imbalance degree, so that the insulation degree between the inner turns of each phase winding is obtained through the three-phase imbalance degree, and the degradation degree of the stator winding 52 is further determined. For example, the current sensors A1, A2 and A3 respectively collect and send the current of the U-phase winding, the current of the V-phase winding and the current of the W-phase winding to the data collector 82, and the data collector 82 determines the current effective value of the U-phase winding, the current effective value of the V-phase winding and the current effective value of the W-phase winding according to the above current data, thereby determining the three-phase imbalance. The tester can directly learn the three-phase unbalance value from the data collector 82, and when the three-phase unbalance value is greater than the cut-off threshold value set by the test, the insulation degree between the turns in each phase winding is lower, which may cause problems such as overload, vibration, noise increase and the like of the motor, and even damage the whole motor. In the case where the stator winding 52 is a three-phase stator winding 52, the degree of degradation of the three-phase stator winding 52 can be obtained not only by testing the three-phase imbalance of the three-phase stator winding 52, but also by combining the insulation resistance values of the three-phase stator winding 52, as described in the above embodiment. Specifically, after the data collector 82 detects the three-phase imbalance of the three-phase stator winding 52 in the first state, it controls the change-over switch 6 to switch to the second state, and simultaneously turns on the insulation resistance meter 84 and the U-phase winding, the V-phase winding and the W-phase winding to collect insulation resistance values between the three phases of the three-phase stator winding 52, so as to obtain insulation degrees between the three phases of the three-phase stator winding 52 and insulation degrees between the three-phase stator winding 52 and the casing, and when the insulation resistance values between the three phases of the three-phase stator winding 52 are greater than a cut-off threshold set by the test, it indicates that the three-phase stator winding 52 has been degraded.
In the above embodiment, in the case that the stator winding 52 is a three-phase stator winding 52, the three-phase imbalance in the degradation process is detected by the current sensor, so as to obtain the insulation degree between each phase turn of the three-phase stator winding 52, and meanwhile, the insulation resistance value between the three phases of the three-phase stator winding 52 and the insulation resistance value of the stator winding 52 to the casing are combined, so that the accuracy of the degradation test process is further ensured.
In one exemplary embodiment, as shown in fig. 2, the system further comprises: the circuit breaker 10. The first end of the circuit breaker 10 is connected to the connection point of the rotor analogue resistor 44 and the excitation analogue reactance 46 and the second end of the circuit breaker 10 is for connection to the power supply 7.
Illustratively, the circuit breaker 10 acts as a circuit switch, and if an overcurrent occurs during the degradation test, the circuit can be automatically opened to ensure the safety of the test circuit.
In one exemplary embodiment, one or more of the transfer switch 6, the rotor analog reactance 42, the rotor analog resistance 44, the excitation analog reactance 46, and the detection assembly 8 are disposed outside the temperature control box 2.
In the above embodiment, the change-over switch 6, the rotor analog reactance 42, the rotor analog resistor 44, the excitation analog reactance 46 and the detection component 8 are arranged outside the temperature control box 2, so that the influence of temperature on the test element is avoided, and the accuracy of the degradation test is ensured.
In one exemplary embodiment, as shown in FIG. 4, the present application provides a method of accelerated degradation testing of a stator winding of an electric machine, the method comprising:
s402, placing a motor stator in a temperature control box; the motor stator comprises a stator winding, a stator core and a machine base.
S404, correspondingly connecting a first end of the stator winding with a first end of the analog link and correspondingly connecting a second end of the stator winding with a first end of the change-over switch through a through hole of the temperature control box; the rotor analog reactance, the rotor analog resistor and the excitation analog reactance are sequentially connected in series between the first end and the second end of each analog link, the connection point of the rotor analog resistor and the excitation analog reactance is used for being connected with a power supply, the second end of the change-over switch is connected with the second end of the analog link, the third end of the change-over switch is correspondingly connected with the first acquisition end of the detection assembly, and the controlled end of the change-over switch is connected with the control end of the detection assembly.
S406, adjusting the rotor simulation reactance to the rotor reactance of the stator winding in the rated power operation state, and adjusting the rotor simulation resistance to the rotor resistance of the stator winding in the rated power operation state, and the excitation simulation reactance to the excitation reactance of the stator winding in the rated power operation state.
S408, adjusting the temperature of the temperature control box to a target temperature; the target temperature is the temperature required for the accelerated degradation test of the stator winding.
S410, under the condition that the temperature of the temperature control box is at the target temperature, circularly executing to control the change-over switch to be in a first state, controlling the change-over switch to be switched from the first state to a second state, and collecting degradation test electric parameters of the change-over switch in the second state until an end condition is met; the ending condition includes the degradation test electrical parameter being greater than a cut-off threshold value of the test setting; the degradation test electrical parameter is used for representing the degradation degree of the stator winding, the first end and the second end of the change-over switch are conducted in the first state, and the first end and the third end of the change-over switch are conducted in the second state.
In the above embodiment, the meaning of each parameter and the implementation manner of each step can refer to the description in the above embodiment, a relatively constant test environment temperature is provided through the temperature control box, and the stator winding of the motor is independently taken out from the whole motor and placed in the temperature control box for testing, so that the problem that other components are damaged first and influence the degradation test accuracy due to the excessively extreme conditions is avoided, and the degradation speed of the stator winding is accelerated and is not interfered by the damage of other components. Secondly, by accessing a simulation link comprising an excitation simulation reactance, a rotor simulation reactance and a rotor simulation resistance, the accessed excitation simulation reactance value, the rotor simulation reactance value and the rotor simulation resistance value are adjusted, the rated working state of the motor in operation is truly simulated, the degradation process of the motor winding is more approximate to the actual situation, and the accelerated degradation test of the motor stator winding is realized by combining a change-over switch and a detection assembly, so that the performance and the degradation degree of the motor stator winding are more accurately evaluated.
In one exemplary embodiment, controlling the change-over switch to switch from the first state to the second state includes:
the change-over switch is controlled to be switched from the first state to the second state at preset time intervals.
In the above embodiment, by controlling the change-over switch 6 to switch from the first state to the second state within a preset time interval, it is ensured that the electrical performance of the stator winding 5 is sufficiently simulated and detected during the test. Meanwhile, the preset time interval can also facilitate data processing and analysis, as the same time interval can ensure the consistency and comparability of the data.
In one exemplary embodiment, the detection assembly includes a data collector and an insulation resistance meter; the control end of the data acquisition unit is connected with the controlled end of the change-over switch, the first end of the insulation resistance meter is correspondingly connected with the third end of the change-over switch, the second end of the insulation resistance meter is connected with the first acquisition end of the data acquisition unit, and the method comprises the following steps:
the change-over switch is controlled by the data collector to be switched from the first state to the second state, so that the insulation resistance meter collects the insulation resistance value of the stator winding.
In the embodiment, through the cooperation of the insulation resistance instrument and the data collector, the change of the insulation resistance value in the degradation testing process of the stator winding is realized, so that the degradation degree of the stator winding is known, the automatic detection is realized, and the accuracy and the efficiency of the detection are improved.
In an exemplary embodiment, in the case that the stator winding is a three-phase stator winding, the detection assembly includes a current sensor correspondingly disposed between the second end of the change-over switch on each analog link and the second end of the analog link, and an output end of the current sensor is connected to the second acquisition end of the data acquisition unit, and the method further includes:
and controlling the current sensor to collect the current of the stator winding when the change-over switch is in the first state.
In the above embodiment, in the case that the stator winding is a three-phase stator winding, the three-phase unbalance degree in the degradation process is detected by the current sensor, so as to obtain the insulation degree between each phase turn of the three-phase stator winding, and meanwhile, the insulation resistance value between the three phases of the three-phase stator winding and the insulation resistance value of the stator winding to the casing are combined, so that the accuracy of the degradation test process is further ensured.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method for testing accelerated degradation of a stator winding of an electric machine, the method comprising:
placing a motor stator in a temperature control box; the motor stator comprises a stator winding, a stator iron core and a base;
through the through hole of the temperature control box, the first end of the stator winding is correspondingly connected with the first end of the analog link, and the second end of the stator winding is correspondingly connected with the first end of the change-over switch; the rotor analog reactance, the rotor analog resistor and the excitation analog reactance are sequentially connected in series between a first end and a second end of each analog link, a connection point of the rotor analog resistor and the excitation analog reactance is used for being connected with a power supply, a second end of the switch is connected with the second end of the analog link, a third end of the switch is correspondingly connected with a first acquisition end of the detection assembly, and a controlled end of the switch is connected with a control end of the detection assembly;
adjusting the rotor simulated reactance to the rotor reactance of the stator winding in the rated power operation state, the rotor simulated resistance to the rotor resistance of the stator winding in the rated power operation state, and the excitation simulated reactance to the excitation reactance of the stator winding in the rated power operation state;
adjusting the temperature of the temperature control box to a target temperature; the target temperature is the temperature required by the accelerated degradation test of the stator winding;
under the condition that the temperature of the temperature control box is at the target temperature, circularly executing control of the change-over switch to be in a first state and control of the change-over switch to be switched from the first state to a second state, and collecting degradation test electric parameters of the change-over switch in the second state until an end condition is met; the end condition includes the degradation test electrical parameter being greater than a cut-off threshold of a test setting; the degradation test electrical parameter is used for representing the degradation degree of the stator winding, the first end and the second end of the switch in the first state are conducted, and the first end and the third end of the switch in the second state are conducted.
2. The method of claim 1, wherein the controlling the change-over switch to switch from the first state to the second state comprises:
and controlling the change-over switch to switch from the first state to the second state at preset time intervals.
3. The method of claim 1, wherein the detection assembly comprises a data collector and an insulation resistance meter; the control end of the data acquisition unit is connected with the controlled end of the change-over switch, the first end of the insulation resistance meter is correspondingly connected with the third end of the change-over switch, the second end of the insulation resistance meter is connected with the first acquisition end of the data acquisition unit, the change-over switch is controlled to be switched from the first state to the second state, and degradation test electric parameters of the change-over switch in the second state are acquired, and the degradation test electric parameters comprise:
and controlling the change-over switch to be switched from the first state to the second state through the data acquisition device so that the insulation resistance meter acquires the insulation resistance value of the stator winding.
4. A method according to claim 3, wherein in the case where the stator windings are three-phase stator windings, the detection assembly comprises a current sensor disposed between the second end of the switch on each of the analog links and the second end of the analog link, the output of the current sensor being connected to the second acquisition end of the data acquisition device, the method further comprising:
and controlling the current sensor to collect the current of the stator winding when the change-over switch is in the first state.
5. An accelerated degradation testing system for a stator winding of an electric machine, the system comprising:
the temperature control box is used for accommodating a motor stator and providing a target temperature, and the target temperature is the temperature required by the accelerated degradation test of the stator winding; the motor stator comprises a stator winding, a stator iron core and a base;
the rotor simulation reactance, the rotor simulation resistor and the excitation simulation reactance are sequentially connected in series between the first end and the second end of each simulation link, the connection point of the rotor simulation resistor and the excitation simulation reactance is used for being connected with a power supply, and the first end of the simulation link is used for being correspondingly connected with the first end of the stator winding; the rotor simulation reactance is used for simulating the rotor reactance of the stator winding in the rated power operation state, the rotor simulation resistance is used for simulating the rotor resistance of the stator winding in the rated power operation state, and the excitation simulation reactance is used for simulating the excitation reactance of the stator winding in the rated power operation state;
the first end of the change-over switch is used for being correspondingly connected with the second end of the stator winding, and the second end of the change-over switch is correspondingly connected with the second end of the analog link;
the first acquisition end of the detection component is correspondingly connected with the third end of the change-over switch, and the control end of the detection component is connected with the controlled end of the change-over switch;
the detection component is used for circularly executing control of the change-over switch to be in a first state and controlling the change-over switch to be switched from the first state to a second state under the condition that the temperature of the temperature control box is at the target temperature, and collecting degradation test electrical parameters of the change-over switch in the second state until an end condition is met; the end condition includes the degradation test electrical parameter being greater than a cut-off threshold of a test setting; the degradation test electrical parameter is used for representing the degradation degree of the stator winding, the first end and the second end of the switch in the first state are conducted, and the first end and the third end of the switch in the second state are conducted.
6. The system of claim 5, wherein the detection component is configured to control the switch to switch from the first state to the second state at preset time intervals.
7. The system of claim 5, wherein the detection assembly comprises:
the control end of the data acquisition unit is connected with the controlled end of the change-over switch;
the first end of the insulation resistance instrument is correspondingly connected with the third end of the change-over switch, and the second end of the insulation resistance instrument is connected with the first acquisition end of the data acquisition device;
the data acquisition device is used for controlling the change-over switch to be switched from a first state to a second state, so that the insulation resistance meter acquires the insulation resistance value of the stator winding.
8. The system of claim 7, wherein in the case where the stator winding is a three-phase stator winding, the detection assembly further comprises:
the current sensor is correspondingly arranged between the second end of the switch on each analog link and the second end of the analog link, the output end of the current sensor is connected with the second acquisition end of the data acquisition device, and the current sensor is used for acquiring the current of the stator winding when the switch is in the first state.
9. The system of any one of claims 5-8, wherein the system further comprises:
and the first end of the circuit breaker is correspondingly connected with the connection point of the rotor simulation resistor and the excitation simulation reactance, and the second end of the circuit breaker is used for being connected with the power supply.
10. The system of claim 5, wherein one or more of the change-over switch, the rotor analog reactance, the rotor analog resistance, the excitation analog reactance, and the detection assembly are disposed outside of the temperature control box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311422321.6A CN117214707A (en) | 2023-10-31 | 2023-10-31 | Accelerated degradation testing method and system for motor stator winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311422321.6A CN117214707A (en) | 2023-10-31 | 2023-10-31 | Accelerated degradation testing method and system for motor stator winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117214707A true CN117214707A (en) | 2023-12-12 |
Family
ID=89037381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311422321.6A Pending CN117214707A (en) | 2023-10-31 | 2023-10-31 | Accelerated degradation testing method and system for motor stator winding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117214707A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207426917U (en) * | 2017-09-08 | 2018-05-29 | 东莞国亮电机有限公司 | Motor stator with overcurrent protection |
| CN110208642A (en) * | 2019-05-22 | 2019-09-06 | 中南大学 | Permanent-magnetic synchronous motor stator shorted-turn fault degenerative process analogy method and system |
| CN110907823A (en) * | 2019-11-04 | 2020-03-24 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Real-time acquisition system and method for servo motor test data |
| CN115656820A (en) * | 2022-10-28 | 2023-01-31 | 苏州科技大学 | Fault and load test system for squirrel-cage asynchronous motor |
| CN116026867A (en) * | 2022-09-09 | 2023-04-28 | 东方电气集团东方电机有限公司 | Method for evaluating insulation aging degree of generator stator winding |
-
2023
- 2023-10-31 CN CN202311422321.6A patent/CN117214707A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207426917U (en) * | 2017-09-08 | 2018-05-29 | 东莞国亮电机有限公司 | Motor stator with overcurrent protection |
| CN110208642A (en) * | 2019-05-22 | 2019-09-06 | 中南大学 | Permanent-magnetic synchronous motor stator shorted-turn fault degenerative process analogy method and system |
| CN110907823A (en) * | 2019-11-04 | 2020-03-24 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Real-time acquisition system and method for servo motor test data |
| CN116026867A (en) * | 2022-09-09 | 2023-04-28 | 东方电气集团东方电机有限公司 | Method for evaluating insulation aging degree of generator stator winding |
| CN115656820A (en) * | 2022-10-28 | 2023-01-31 | 苏州科技大学 | Fault and load test system for squirrel-cage asynchronous motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nyanteh et al. | Application of artificial intelligence to real-time fault detection in permanent-magnet synchronous machines | |
| CN110297183B (en) | Method and device for diagnosing turn-to-turn short circuit fault of rotor of synchronous phase modulator and storage medium | |
| CN110854924B (en) | One-time voltage-on synchronous phase-checking linkage switching inspection system and inspection method for electrical system | |
| CN111123104B (en) | Permanent magnet motor winding fault diagnosis method without prior knowledge | |
| KR20180120112A (en) | A method for identifying a fault event in an electric power distribution grid sector | |
| Shackshaft et al. | Results of stability tests on an underexcited 120 MW generator | |
| CN113702831B (en) | Power equipment protection device testing system and testing method | |
| CN110749810A (en) | Insulation fault prediction method and system for phase modulator | |
| Iorgulescu et al. | Faults diagnosis for electrical machines based on analysis of motor current | |
| CN108345706B (en) | Power supply fast switching simulation method and model | |
| CN117214707A (en) | Accelerated degradation testing method and system for motor stator winding | |
| Bhattacharyya et al. | Induction motor fault diagnosis by motor current signature analysis and neural network techniques | |
| Lee et al. | Diagnosis of interturn short-circuit fault in PMSM by residual voltage analysis | |
| Refaat et al. | ANN-based diagnosis of incipient stator winding turn faults for three-phase induction motors in the presence of unbalanced supply voltage | |
| Rehman et al. | Experimental research and analysis on rotor winding inter-turn short circuit fault in DFIG | |
| CN115656820A (en) | Fault and load test system for squirrel-cage asynchronous motor | |
| Younsi et al. | Online capacitance and dissipation factor monitoring of AC motor stator insulation | |
| Ebrahimi | Characterization of a large electrical machine test bench for advanced investigations on wind and hydro generators | |
| Hamatwi et al. | Development of a Test Rig for Fault Studies on a scaled-down DFIG | |
| CN113359030A (en) | Wind driven generator short circuit fault simulation platform based on external magnetic flux leakage detection | |
| CN211456713U (en) | One-time pressure-on synchronous nuclear phase linkage switching and testing system for electrical system | |
| CN111624486A (en) | Online insulation detection method and device for generator of doubly-fed wind turbine generator | |
| Pires et al. | Stator winding fault diagnosis in induction motors using the dq current trajectory mass center | |
| Neti et al. | Motor current signature analysis during accelerated life testing of form wound induction motors | |
| CN111610468A (en) | Star-delta starting main loop wiring detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |