CN115753913B - Method, device, equipment and medium for determining wet degradation of motor stator bar - Google Patents
Method, device, equipment and medium for determining wet degradation of motor stator bar Download PDFInfo
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Abstract
The embodiment of the invention discloses a method, a device, equipment and a medium for determining the wet degradation of a motor stator bar. The method comprises the following steps: responding to an abnormal stop instruction of a target motor, obtaining a target stator bar of the target motor, and obtaining a test bar; performing at least one project mark test on the test wire rod to obtain each target test result; wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index; and determining the target stator bar wet degradation of the target motor when each target test result meets the wet degradation condition. According to the scheme provided by the embodiment of the invention, whether the insulation structure of the stator bar is wet and deteriorated can be accurately determined.
Description
Technical Field
The embodiment of the invention relates to the technical field of wet degradation judgment of a stator bar insulation structure, in particular to a method, a device, equipment and a medium for determining the wet degradation of a motor stator bar.
Background
The stator bar insulation structure of the pumped storage generator motor always bears the effects of electric stress, thermal stress, thermo-mechanical stress and environmental stress in the operation process, wherein the environmental stress mainly refers to wet degradation stress, the wet degradation stress is caused by a high-temperature and high-humidity environment of a hydropower station and special conditions (such as water immersion), the long-term effect can lead to moisture absorption and layering degradation of the stator bar insulation structure, and the occurrence of grounding accidents can be caused when serious, so that the safe operation of a unit is threatened.
Aiming at the degradation evaluation of the electric stress and the thermal stress of the insulating structure of the stator bar, corresponding national standards and industry standards such as GB/T17948.4 rotating motor-insulating structure functionality evaluation-forming winding test procedure-voltage durability evaluation and NB/T42004 high-voltage alternating current motor stator coil insulation electric aging test method are established in China; since the stator winding operating temperature of the hydro-generator and the pumped storage generator motor is not higher than 120 ℃ generally, the thermal stress is not the main degradation type of the generator, and thus the test is not usually carried out specifically for the thermal stress, but the electric stress and the thermal stress are comprehensively considered as multi-factor degradation factors, and the standard GB/T17948.5 rotating electrical machine-insulation structure functionality evaluation-forming winding test procedure-thermal and electric comprehensive stress durability multi-factor evaluation is carried out; thermomechanical degradation is a typical insulation degradation pattern for pumped storage generator motors, partly with reference to standard GB/T17948.6 rotating electrical machine-insulation structure functionality assessment-molded winding test protocol-insulation structure thermomechanical durability assessment. At present, no unified test method and degradation criterion index are formulated at home and abroad for evaluating the wet degradation of the insulating structure.
How to accurately determine whether a stator bar insulation structure is deteriorated by moisture through a test method is an important problem of the research in the industry.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a medium for determining the wet degradation of a stator bar of a motor so as to accurately determine whether an insulation structure of the stator bar is wet degraded.
According to an aspect of the embodiment of the present invention, there is provided a method for determining wet degradation of a stator bar of a motor, including:
responding to an abnormal stop instruction of a target motor, obtaining a target stator bar of the target motor, and obtaining a test bar;
performing at least one project mark test on the test wire rod to obtain each target test result; wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index;
and determining the target stator bar wet degradation of the target motor when each target test result meets the wet degradation condition.
According to another aspect of the embodiment of the present invention, there is provided a determining apparatus of wet degradation of a stator bar of a motor, including:
The test wire rod acquisition module is used for responding to an abnormal stop instruction of a target motor, acquiring a target stator wire rod of the target motor and obtaining a test wire rod;
the target test result determining module is used for performing at least one project label test on the test wire rod to obtain each target test result; wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index;
and the wet degradation determining module is used for determining the wet degradation of the target stator bar of the target motor when each target test result meets the wet degradation condition.
According to another aspect of an embodiment of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method for determining motor stator bar wet degradation according to any one of the embodiments of the present invention.
According to another aspect of the embodiments of the present invention, there is provided a computer readable storage medium storing computer instructions for implementing the method for determining the wet degradation of a stator bar of an electric motor according to any one of the embodiments of the present invention when executed by a processor.
According to the technical scheme, the target stator bar of the target motor is obtained by responding to an abnormal stop instruction of the target motor, and a test bar is obtained; performing at least one project mark test on the test wire rod to obtain each target test result; wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index; when each target test result satisfies the wet degradation condition, determining the target stator bar wet degradation of the target motor can accurately determine whether the stator bar insulation structure is wet degraded.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention, nor is it intended to be used to limit the scope of the embodiments of the invention. Other features of embodiments of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for determining wet degradation of a stator bar of an electric motor according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a target stator bar according to a first embodiment of the present invention;
fig. 3 is a flowchart of a method for determining wet degradation of a stator bar of a motor according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of an electrode structure for dielectric loss tangent measurement according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of electrode structure wiring for polarization index measurement and depolarization current index measurement according to a second embodiment of the present invention;
fig. 6 is a schematic structural view of a determining device for wet degradation of a stator bar of a motor according to a third embodiment of the present invention;
Fig. 7 is a schematic structural view of an electronic device implementing a method of determining wet degradation of a motor stator bar according to an embodiment of the present invention.
Detailed Description
In order to make the embodiments of the present invention better understood by those skilled in the art, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the embodiments of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the embodiments of the present invention and the above-described drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for determining moisture degradation of a stator bar of an electric motor according to an embodiment of the present invention, where the method may be applied to accurately determine whether a stator bar insulation structure is degraded by a test method, and the method may be performed by a device for determining moisture degradation of a stator bar of an electric motor, where the device for determining moisture degradation of a stator bar of an electric motor may be implemented in hardware and/or software, and the device for determining moisture degradation of a stator bar of an electric motor may be configured in an electronic device such as a computer, a server, or a tablet computer. Specifically, referring to fig. 1, the method specifically includes the following steps:
and 110, responding to an abnormal stop command of the target motor, acquiring a target stator bar of the target motor, and obtaining a test bar.
The target motor may be any generator motor in the pumped-storage unit, which is not limited in this embodiment. The target stator bar of the target motor may be any one of the stator bars of the target motor, and is not limited in this embodiment.
In an alternative implementation manner of this embodiment, if a sudden stop of the target motor, that is, an abnormal stop, is detected, the target stator bar of the target motor may be obtained, and then the test bar may be obtained by cutting out the target stator bar.
Optionally, in this embodiment, obtaining the target stator bar of the target motor and obtaining the test bar may include: and removing the target stator bar from the iron core slot, reserving a linear part of the stator bar within the long range of the iron core of the target stator bar slot part, and removing the low-resistance anti-corona layer of the target stator bar to obtain the test bar.
The stator bar used by the running unit of the pumped storage hydropower station is a finished product bar, and a permanent groove part low-resistance (anti-corona) layer (area) and an end part high-resistance (anti-corona) layer (area) are formed; FIG. 2 is a schematic view of a target stator bar according to an embodiment of the present invention, as shown in FIG. 2, after a pumped storage generator motor unit using a low-glue VPI (Vacuum Pressure Impregnating, vacuum pressure impregnation) stator bar insulation structure is stopped, removing a sub-bar to be evaluated from a core slot, removing surface attachments, placing the sub-bar on a dry insulation support frame, retaining a linear part of the stator bar within a slot core length range of the stator bar, and cutting two end parts (parts outside the slot core length range) of the bar; cutting off an insulating layer with the width of 20mm at one end of a linear part of the cut wire rod, taking an exposed copper conductor as a high-voltage electrode, then respectively removing low-resistance anti-corona layers with the width of 200mm along the surface from the insulating tail ends at two sides of the wire rod, wiping the surface of the wire rod by absolute ethyl alcohol after cutting off, removing surface dirt, wrapping an aluminum foil electrode on the surface of the low-resistance anti-corona layer of the wire rod as a measuring electrode, leading wires (usually bare copper wires) from the middle part, and tightening the whole measuring electrode by using a polyester wave band; aluminum foil electrodes with the width of 10mm are respectively stuck at the two sides of the wire rod and at the distance of 10mm from the tail end of the low-resistance anti-corona layer to serve as protection electrodes.
And 120, performing at least one project label test on the test wire rod to obtain each target test result.
Wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index.
In an optional implementation manner of this embodiment, after the test bar is obtained by interception, at least one project label test may be further performed on the test bar, so as to obtain a target test result; for example, dielectric loss factor measurement, polarization index measurement, and depolarization current measurement can be performed on the test bars, respectively, to obtain dielectric loss factor, polarization index, and depolarization index.
Alternatively, the dielectric loss tangent measurement, the polarization index measurement, and the depolarization current measurement may be performed by a dielectric loss tangent tester and an insulation resistance tester in the present embodiment.
And 130, determining the wet degradation of the target stator bar of the target motor when each target test result meets the wet degradation condition.
Wherein the moisture degradation condition should include at least one of:
Dielectric loss factor: magnitude (0.2U) N ) < magnitude (0.4U) N ) < magnitude (0.6U) N ) < magnitude (0.8U) N ) < magnitude (1.0U) N ) < magnitude (1.2U) N ) The method comprises the steps of carrying out a first treatment on the surface of the Polarization index:
and, depolarization index:at the same time->Wherein U is N Is the rated line voltage.
In an alternative implementation manner of the present embodiment, after each target test result is obtained, each target test result may be sequentially compared with each moisture degradation condition, and when each target test result satisfies the moisture degradation condition, then the target stator bar of the target motor may be determined to be moisture degraded.
In the present embodiment, the dielectric loss tangent obtained by the test is as high as 0.2U N ) < magnitude (0.4U) N ) < magnitude (0.6U) N ) < magnitude (0.8U) N ) < magnitude (1.0U) N ) < magnitude (1.2U) N ) The method comprises the steps of carrying out a first treatment on the surface of the The polarization index satisfiesAnd depolarization index satisfies->At the same timeThe target stator bar wet degradation of the target motor may be determined.
According to the technical scheme, a target stator bar of a target motor is obtained by responding to an abnormal stop instruction of the target motor, and a test bar is obtained; performing at least one project mark test on the test wire rod to obtain each target test result; when each target test result satisfies the wet degradation condition, determining the target stator bar wet degradation of the target motor can accurately determine whether the stator bar insulation structure is wet degraded.
Example two
Fig. 3 is a flowchart of a method for determining wet degradation of a stator bar of an electric motor according to a second embodiment of the present invention, where the technical solutions of the present invention are further refined, and the technical solutions of the present invention may be combined with each of the alternatives in one or more embodiments. As shown in fig. 3, the method for determining the wet degradation of the motor stator bar may include the steps of:
and 310, responding to an abnormal stop command of a target motor, acquiring a target stator bar of the target motor, and obtaining a test bar.
And 320, performing at least one project label test on the test wire rod to obtain each target test result.
Wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index.
In an alternative implementation manner of this embodiment, after the test bar is obtained by clipping, dielectric loss factor measurement, polarization index measurement, and depolarization current measurement may be further performed on the clipped test bar, so as to obtain a dielectric loss factor, a polarization index, and a depolarization index, respectively.
Optionally, in this embodiment, performing dielectric loss factor measurement, polarization index measurement, and depolarization current measurement on the test bar respectively may include: measuring the dielectric loss factor of the test bar by a dielectric loss factor tester; polarization index measurement and depolarization index measurement were performed by an insulation resistance tester.
In an alternative implementation manner of the present embodiment, the dielectric loss tangent measurement of the test bar by using a dielectric loss tangent tester may include: the line voltage of the dielectric loss factor tester is respectively set to be 0.2U N 、0.4U N 、0.6U N 、0.8U N 、1.0U N 1.2U N The high-voltage electrode of the test wire rod is connected to the high-voltage end, the measuring electrode of the test wire rod is connected to the low-voltage measuring end of the dielectric loss factor tester, and the protecting electrode of the test wire rod is grounded to form a positive wiring and three-electrode measuring system; wherein U is N Is the rated line voltage.
Fig. 4 is a schematic diagram of an electrode structure for dielectric loss tangent measurement according to a second embodiment of the present invention; as shown in FIG. 4, at 0.2U N 、0.4U N 、0.6U N 、0.8U N 、1.0U N 、1.2U N Dielectric loss tangent test was performed with U N For rated line voltage, the high-voltage electrode of the test line bar is connected to a high-voltage end (usually a high-voltage output end of a power frequency test transformer which can output no partial discharge and meets the requirements of GB/T16927.1), the measuring electrode of the test line bar is connected to a low-voltage measuring end of a dielectric loss factor tester, and the protective electrode of the test line bar is grounded, so that a positive wiring and three-electrode measuring system is formed.
Further, the polarization index measurement and the depolarization index measurement by the insulation resistance tester may include: and measuring insulation resistance and polarization index through an insulation resistance tester with the voltage of 2500V, connecting a high-voltage electrode of the test wire rod to a direct-current high-voltage end of the insulation resistance tester, connecting a measuring electrode of the test wire rod to a low-voltage end of an insulation resistance measuring instrument and grounding, and grounding a protective electrode of the test wire rod.
And carrying out polarization depolarization current measurement under the voltage of 500V, connecting the high-voltage electrode of the test bar to the direct-current high-voltage end of the insulation resistance tester, connecting the measuring electrode of the test bar to the low-voltage end of the insulation resistance tester and grounding the test bar protection electrode.
Fig. 5 is a schematic diagram of electrode structure wiring for polarization index measurement and depolarization current index measurement according to a second embodiment of the present invention; as shown in FIG. 5, an insulation resistance tester with a direct current of 2500V can be selected for insulation resistance and polarization index measurement, a high-voltage electrode of a test bar is connected to a direct current high-voltage end of the insulation resistance tester, a measurement electrode of the test bar is connected to a low-voltage end of the insulation resistance tester and is grounded, a protection electrode of the test bar is grounded, the selected electrode structure is different from a commonly used two-electrode structure, the insulation resistance values of 1 minute and 10 minutes are measured, and the polarization index can be obtained through calculation or direct reading according to different functions of the tester.
Further, the method can be carried out under the direct current of 500V
The depolarization current measurement, the basic measurement wiring is the same as that of fig. 5, a depolarization current measurement process is illustrated by taking a KEITHLEY 6487 picoammeter/Iris DRA III measurement device as an example, a test bar high-voltage electrode is connected to a direct-current high-voltage end of the measurement device, a test bar measurement electrode is connected to a low-voltage end of the measurement device and grounded, a test bar protection electrode is grounded, the measurement process is divided into polarization current measurement and depolarization current measurement, the polarization current measurement time is set to be 10 minutes, the depolarization current measurement time is set to be 10 minutes, and after the polarization current measurement is completed, depolarization current measurement is immediately performed under the condition that no retention time exists, and depolarization current values of 1 second, 10 seconds, 1 minute and 10 minutes are read; when the polarization current is measured, the direct current high voltage is connected to the circuit, the current value is manually/automatically read through the built-in picoammeter, after the specified time is reached, the built-in switch is disconnected, the high voltage is removed, the measuring circuit is reversely connected, the depolarization current is measured, and the reverse current is manually/automatically measured through the built-in picoammeter. Since the high voltage value (500V) is selected to be relatively low, the high voltage breaker does not need to be activated, and thus the holding time may not be set.
And 330, determining the wet degradation of the target stator bar of the target motor when each target test result meets the wet degradation condition.
In an alternative implementation of this embodiment, when the measured dielectric loss tangent, polarization index, and depolarization index respectively satisfy: 0.2U N Corresponding magnitude < 0.4U N Corresponding magnitude is less than 0.6U N Corresponding magnitude is less than 0.8U N Corresponding magnitude is less than 1.0U N Corresponding magnitude is less than 1.2U N Corresponding magnitude of,The method comprises the steps of,at the same time->When the target stator bar is wet degraded.
It should be noted that stator bar thermomechanical stress degradation and moisture (stress) degradation are the most common degradation patterns of stator bars of pumped storage generator motors, since thermomechanical degradation will lead to delamination between the copper conductor of the stator bar and the main insulation, and the dielectric loss tangent will exhibit characteristic variation characteristics: magnitude (0.2U) N ) < magnitude (0.4U) N ) < magnitude (0.6U) N ) Magnitude (1.2U) N ) < magnitude (1.0U) N ) < magnitude (0.8U) N ) < magnitude (0.6U) N ) This is inconsistent with the determination regarding the dielectric loss tangent in the embodiments of the present invention, and thus the thermal mechanical degradation of the insulating structure can be distinguished by the determination regarding the dielectric loss tangent in the present invention.
Meanwhile, insulation resistance and polarization index measurement are common means for judging the degradation of an insulation structure of a stator bar, wherein the insulation resistance is an important means for judging breakdown, and the polarization index is related to the moisture degradation of the insulation structure, surface conductivity pollution and anti-corona structure and is insensitive to the characteristic expression of electric stress degradation;
meanwhile, the change conditions of the charging current and the discharging current can be intuitively displayed by the polarization current and the depolarization current measurement, under the condition of externally applied direct current voltage (step voltage and 500V), the measured total current consists of surface leakage current, conductance current, capacitance current and absorption current, after the externally applied direct current voltage is removed, the measured total current consists of capacitance current and absorption current, the polarization index measurement and the depolarization current measurement are not influenced due to extremely fast attenuation (not more than 0.5 seconds) of the capacitance current, the depolarization index is the ratio of the depolarization currents at two different times, the residual current is only absorption (polarization discharging) current due to the fact that the high voltage is removed, the measuring unit does not comprise a high-resistance corona prevention area of a bar and adopts a shielding electrode structure, the influence of polarization of an anti-corona interlayer caused by different conductivities is eliminated, the interface polarization (polarization effect is generated after water absorption) is dominant, so that the depolarization index becomes a characteristic parameter for judging the wet degradation, and the depolarization index is determined by combining with the on-site operation condition and the wet working condition simulation in a test room.
The copper hammer knocks the surface of the wire rod and judges the insulation state by using the human ear, which is a common means for judging the insulation degradation state, and the voice acquisition and analysis system is used for transmitting data to the computer system while knocking, and the data is subjected to Fourier analysis to obtain an auxiliary characteristic criterion of wet degradation; knocking the surface of a wire rod by using a solid copper hammer, simultaneously installing a B & K acoustic sensor near a measured part, knocking main insulation to generate frequency response, transmitting a measured acoustic response signal to a B & K-1704 acoustic amplifier, setting amplification gain according to a site noise environment, transmitting the amplified acoustic signal to an NI-9185 data acquisition and analysis system, transmitting data to a computer through an industrial Ethernet, carrying out Fourier transform on the signal, and generating 1-time or more pulses with amplitude 10 times greater than background noise level in a frequency range of 8000Hz +/-2000 Hz as an auxiliary criterion; the auxiliary criteria do not affect the decision result of the main criteria.
And 340, sending a replacement instruction of the target stator bar of the target motor to a maintenance personnel, and timely replacing the target stator bar of the target motor.
In an alternative implementation of the present embodiment, after determining that the target stator bar of the target motor is wet-degraded, a replacement instruction of the target stator bar of the target motor may be further sent to a serviceman (for example, to a terminal held by the serviceman) so as to enable the target stator bar to be replaced in time, thereby avoiding affecting the normal power generation of the target motor due to the wet degradation of the target stator bar.
According to the scheme of the embodiment, after the wet degradation of the target stator bar of the target motor is determined, a replacement instruction of the target stator bar of the target motor can be further sent to maintenance personnel, so that the target stator bar is replaced timely, and the influence on the normal power generation of the target motor due to the wet degradation of the target stator bar is avoided.
Example III
Fig. 6 is a schematic structural view of a determining apparatus for wet degradation of a stator bar of a motor according to a third embodiment of the present invention. As shown in fig. 6, the apparatus includes: a test bar acquisition module 610, a target test result determination module 620, and a wet degradation determination module 630.
A test bar acquisition module 610, configured to acquire a target stator bar of a target motor in response to an abnormal shutdown instruction of the target motor, and obtain a test bar;
the target test result determining module 620 is configured to perform at least one project label test on the test wire rod to obtain each target test result; wherein the target test comprises at least one of: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result includes at least one of: dielectric loss factor, polarization index, and depolarization index;
A wet degradation determination module 630 for determining a target stator bar wet degradation of the target motor when each target test result satisfies a wet degradation condition.
According to the scheme of the embodiment, a test bar acquisition module responds to an abnormal shutdown instruction of a target motor to acquire a target stator bar of the target motor and obtain a test bar; performing at least one project standard test on the test wire rod through a target test result determining module to obtain each target test result; by determining the target stator bar wet degradation of the target motor by the wet degradation determination module, it is possible to accurately determine whether the stator bar insulation structure is wet degraded.
In an alternative implementation manner of this embodiment, the test bar obtaining module 610 is specifically configured to remove the target stator bar from the core slot, reserve a linear portion of the stator bar within a long range of the core of the slot portion of the target stator bar, and remove the low-resistance anti-corona layer of the target stator bar to obtain the test bar.
In an alternative implementation manner of this embodiment, the target test result determining module 620 is specifically configured to perform dielectric loss factor measurement, polarization index measurement, and depolarization current measurement on the test bar, to obtain a dielectric loss factor, a polarization index, and a depolarization index, respectively.
In an alternative implementation manner of this embodiment, the target test result determining module 620 is further specifically configured to perform dielectric loss factor measurement on the test bar by using a dielectric loss factor tester; polarization index measurement and depolarization index measurement were performed by an insulation resistance tester.
In an optional implementation manner of this embodiment, the target test result determining module 620 is further specifically configured to set line voltages of the dielectric loss tangent tester to 0.2U respectively N 、0.4U N 、0.6U N 、0.8U N 、1.0U N 1.2U N The high-voltage electrode of the test wire rod is connected to the high-voltage end, the measuring electrode of the test wire rod is connected to the low-voltage measuring end of the dielectric loss factor tester, and the protecting electrode of the test wire rod is grounded to form a positive wiring and three-electrode measuring system; wherein U is N Is rated line voltage;
measuring insulation resistance and polarization index by an insulation resistance tester with a voltage of 2500V, connecting a high-voltage electrode of the test bar to a direct-current high-voltage end of the insulation resistance tester, connecting a measuring electrode of the test bar to a low-voltage end of an insulation resistance measuring instrument and grounding, and grounding a protective electrode of the test bar;
depolarization current measurement is performed under the direct current 500V voltage, the high-voltage electrode of the test bar is connected to the direct current high-voltage end of the insulation resistance tester, the measurement electrode of the test bar is connected to the low-voltage end of the insulation resistance tester and grounded, and the protection electrode of the test bar is grounded.
In an alternative implementation of this embodiment, the wet degradation condition includes at least one of:
medium (D)Loss factor: magnitude (0.2U) N ) < magnitude (0.4U) N ) < magnitude (0.6U) N ) < magnitude (0.8U) N ) < magnitude (1.0U) N ) < magnitude (1.2U) N )；
Polarization index:
and, depolarization index:at the same time->
In an alternative implementation of this embodiment, the apparatus for determining wet degradation of a stator bar of a motor further includes: and the replacement instruction sending module is used for sending a replacement instruction of the target stator bar of the target motor to a maintenance person and timely replacing the target stator bar of the target motor.
The device for determining the wet degradation of the motor stator bar provided by the embodiment of the invention can execute the method for determining the wet degradation of the motor stator bar provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 7 shows a schematic diagram of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the embodiments of the invention described and/or claimed herein.
As shown in fig. 7, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the method of determining motor stator bar wet degradation.
In some embodiments, the method of determining motor stator bar wet degradation may be implemented as a computer program tangibly embodied on a computer readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the above-described method of determining motor stator bar moisture degradation may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method of determining motor stator bar wet degradation in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of embodiments of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the embodiments of the present invention may be performed in parallel, sequentially or in a different order, so long as the desired result of the technical solution of the embodiments of the present invention can be achieved, which is not limited herein.
The above detailed description should not be construed as limiting the scope of the embodiments of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.
Claims (5)
1. A method of determining wet degradation of a stator bar of an electric motor, comprising:
responding to an abnormal stop instruction of a target motor, obtaining a target stator bar of the target motor, and obtaining a test bar;
performing target test on the test wire rod to obtain each target test result; wherein the target test comprises: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result comprises: dielectric loss factor, polarization index, and depolarization index;
Determining a target stator bar wet degradation of the target motor when each target test result satisfies a wet degradation condition;
the obtaining the target stator bar of the target motor and obtaining a test bar comprises the following steps:
removing the target stator bar from the iron core slot, reserving a linear part of the stator bar within the long range of the iron core of the target stator bar slot part, and removing a low-resistance anti-corona layer of the target stator bar to obtain the test bar;
the method for testing the stator bar comprises the steps of reserving a linear part of the stator bar within the length range of an iron core of a slot part of the target stator bar, removing a low-resistance anti-corona layer of the target stator bar to obtain the test bar, and comprises the following steps:
reserving a linear part of the stator bar within the length range of the iron core of the slot part of the target stator bar, and cutting off two end parts of the target stator bar;
cutting off an insulating layer with the width of 20mm at one end of the linear part of the target stator bar;
removing 200mm wide low-resistance anti-corona layers from the two side insulation tail ends of the target stator bar along the surface respectively, and wiping the surface of the target stator bar with absolute ethyl alcohol;
wrapping an aluminum foil electrode on the surface of the low-resistance anti-corona layer of the target stator bar to serve as a measuring electrode, leading a wire from the middle part of the target stator bar, and tightening the measuring electrode by using a polyester band;
Respectively pasting aluminum foil electrodes with the width of 10mm on two sides of the target stator bar at a distance of 10mm from the tail end of the low-resistance anti-corona layer to serve as protection poles, and obtaining a test bar;
and performing target test on the test wire rod to obtain each target test result, wherein the target test result comprises:
respectively measuring a dielectric loss factor, a polarization index and a depolarization current of the test wire rod to obtain the dielectric loss factor, the polarization index and the depolarization index;
the dielectric loss factor measurement, the polarization index measurement and the depolarization current measurement are respectively carried out on the test wire rod, and the dielectric loss factor measurement, the polarization index measurement and the depolarization current measurement comprise the following steps:
measuring the dielectric loss factor of the test bar by a dielectric loss factor tester;
performing polarization index measurement and depolarization index measurement by an insulation resistance tester;
the dielectric loss factor measurement of the test bar by the dielectric loss factor tester comprises the following steps:
the line voltage of the dielectric loss factor tester is respectively set to be 0.2U N 、0.4U N 、0.6U N 、0.8U N 、1.0U N 1.2U N The high-voltage electrode of the test wire rod is connected to the high-voltage end, the measuring electrode of the test wire rod is connected to the low-voltage measuring end of the dielectric loss factor tester, and the protecting electrode of the test wire rod is grounded to form a positive wiring and three-electrode measuring system;
Wherein U is N Is rated line voltage;
the polarization index measurement and the depolarization index measurement by the insulation resistance tester comprise: measuring insulation resistance and polarization index by an insulation resistance tester with a voltage of 2500V, connecting a high-voltage electrode of the test bar to a direct-current high-voltage end of the insulation resistance tester, connecting a measuring electrode of the test bar to a low-voltage end of an insulation resistance measuring instrument and grounding, and grounding a protective electrode of the test bar;
carrying out depolarization current measurement under the voltage of 500V, connecting a high-voltage electrode of the test bar to a direct-current high-voltage end of an insulation resistance tester, connecting a measuring electrode of the test bar to a low-voltage end of the insulation resistance tester and grounding the measuring electrode, and grounding a protective electrode of the test bar;
the wet degradation condition needs to satisfy the following conditions simultaneously:
dielectric loss factor: 0.2U N Corresponding magnitude < 0.4U N Corresponding magnitude is less than 0.6U N Corresponding magnitude is less than 0.8U N Corresponding magnitude is less than 1.0U N Corresponding magnitude is less than 1.2U N Corresponding magnitude;
polarization index:and, depolarization index: />At the same time
2. The method of claim 1, further comprising, after determining a target stator bar wet degradation of the target motor:
And sending a replacement instruction of the target stator bar of the target motor to a maintenance personnel, and timely replacing the target stator bar of the target motor.
3. A device for determining moisture degradation of a stator bar of an electric motor, comprising:
the test wire rod acquisition module is used for responding to an abnormal stop instruction of a target motor, acquiring a target stator wire rod of the target motor and obtaining a test wire rod;
the target test result determining module is used for performing target test on the test wire rod to obtain each target test result; wherein the target test comprises: dielectric loss factor measurement, polarization index measurement, and depolarization current measurement; the target test result comprises: dielectric loss factor, polarization index, and depolarization index;
a wet degradation determination module for determining a target stator bar wet degradation of the target motor when each target test result satisfies a wet degradation condition;
the test wire rod acquisition module is further used for moving the target stator wire rod out of the iron core groove, reserving a linear part of the stator wire rod in the long range of the iron core of the groove part of the target stator wire rod, and removing a low-resistance corona-preventing layer of the target stator wire rod to obtain the test wire rod;
The method for testing the stator bar comprises the steps of reserving a linear part of the stator bar within the length range of an iron core of a slot part of the target stator bar, removing a low-resistance anti-corona layer of the target stator bar to obtain the test bar, and comprises the following steps:
reserving a linear part of the stator bar within the length range of the iron core of the slot part of the target stator bar, and cutting off two end parts of the target stator bar;
cutting off an insulating layer with the width of 20mm at one end of the linear part of the target stator bar;
removing 200mm wide low-resistance anti-corona layers from the two side insulation tail ends of the target stator bar along the surface respectively, and wiping the surface of the target stator bar with absolute ethyl alcohol;
wrapping an aluminum foil electrode on the surface of the low-resistance anti-corona layer of the target stator bar to serve as a measuring electrode, leading a wire from the middle part of the target stator bar, and tightening the measuring electrode by using a polyester band;
respectively pasting aluminum foil electrodes with the width of 10mm on two sides of the target stator bar at a distance of 10mm from the tail end of the low-resistance anti-corona layer to serve as protection poles, and obtaining a test bar;
the target test result determining module is further used for respectively measuring a dielectric loss factor, a polarization index and a depolarization current of the test wire rod to obtain the dielectric loss factor, the polarization index and the depolarization index;
The target test result determining module is further used for measuring the dielectric loss factor of the test wire rod through a dielectric loss factor tester;
performing polarization index measurement and depolarization index measurement by an insulation resistance tester;
the target test result determining module is further used for setting the line voltage of the dielectric loss factor tester to be 0.2U respectively N 、0.4U N 、0.6U N 、0.8U N 、1.0U N 1.2U N The high-voltage electrode of the test wire rod is connected to a high-voltage end, the measuring electrode of the test wire rod is connected to a low-voltage measuring end of a dielectric loss factor tester, and the test wireThe protection electrode of the rod is grounded to form a positive wiring and three-electrode measuring system;
wherein U is N Is rated line voltage;
measuring insulation resistance and polarization index by an insulation resistance tester with a voltage of 2500V, connecting a high-voltage electrode of the test bar to a direct-current high-voltage end of the insulation resistance tester, connecting a measuring electrode of the test bar to a low-voltage end of an insulation resistance measuring instrument and grounding, and grounding a protective electrode of the test bar;
carrying out depolarization current measurement under the voltage of 500V, connecting a high-voltage electrode of the test bar to a direct-current high-voltage end of an insulation resistance tester, connecting a measuring electrode of the test bar to a low-voltage end of the insulation resistance tester and grounding the measuring electrode, and grounding a protective electrode of the test bar;
The wet degradation conditions include:
dielectric loss factor: 0.2U N Corresponding magnitude < 0.4U N Corresponding magnitude is less than 0.6U N Corresponding magnitude is less than 0.8U N Corresponding magnitude is less than 1.0U N Corresponding magnitude is less than 1.2U N Corresponding magnitude;
polarization index:and, depolarization index: />At the same time
4. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of determining motor stator bar wet degradation of any one of claims 1-2.
5. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions for causing a processor to execute a method of determining the wet degradation of a motor stator bar according to any one of claims 1-2.
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Effective date of registration: 20240612 Address after: Room 1217, No. 858, Lianhua Avenue West, Donghuan Street, Panyu District, Guangzhou, Guangdong 510000 Patentee after: INSPECTION AND TEST BRANCH OF SOUTHERN POWER GRID PEAKING FM POWER GENERATION Co.,Ltd. Country or region after: China Patentee after: Guangzhou Qiming Shuzhi Energy Technology Co.,Ltd. Address before: Room 1217, No. 858, Lianhua Avenue West, Donghuan Street, Panyu District, Guangzhou, Guangdong 510000 Patentee before: INSPECTION AND TEST BRANCH OF SOUTHERN POWER GRID PEAKING FM POWER GENERATION Co.,Ltd. Country or region before: China |