CN116298734B - Method, device, equipment and medium for testing insulation performance of engine stator - Google Patents
Method, device, equipment and medium for testing insulation performance of engine stator Download PDFInfo
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- CN116298734B CN116298734B CN202310495042.6A CN202310495042A CN116298734B CN 116298734 B CN116298734 B CN 116298734B CN 202310495042 A CN202310495042 A CN 202310495042A CN 116298734 B CN116298734 B CN 116298734B
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- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The invention discloses a method, a device, equipment and a medium for testing the insulation performance of an engine stator. The method comprises the following steps: acquiring each phase of stator winding of the engine stator, and performing interference elimination treatment on each phase of stator winding; respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination to obtain polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each phase of polarization depolarization current data; and if the engine stator passes the first insulation performance test, performing a second insulation performance test on the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator so as to obtain a second insulation performance test result. According to the technical scheme, the insulation performance of the engine stator of the engine can be tested, and the accuracy and precision of the insulation performance test of the engine stator are improved.
Description
Technical Field
The invention relates to the field of engine testing, in particular to a method, a device, equipment and a medium for testing the insulation performance of an engine stator.
Background
The stator of the engine is an essential part of the engine, and the stator is a stationary part of the motor or generator. The stator consists of a stator core, a stator winding and a stand. The main function of the stator is to generate a rotating magnetic field, and the main function of the rotor is to be cut by magnetic lines of force in the rotating magnetic field to generate current.
The polarization depolarization test is a key item of the insulation performance of the pumped storage engine stator, and can accurately judge the insulation performance of the engine stator to determine whether the engine runs reliably. Currently, in the aspect of stator insulation polarization depolarization test of a pumped storage engine, a macroscopic image comparison method is adopted to test the insulation performance of an engine stator for judging the traditional polarization depolarization test result.
The inventors have found that the following problems exist in the prior art in the process of implementing the present invention: the traditional testing method often causes larger errors of testing results due to factors such as nonstandard testing steps or insufficient discharge, and the like, and inaccurate evaluation of insulation performance, and meanwhile, the traditional macroscopic image comparison method often relies on expert experience for judgment, so that the insulation performance of the engine stator is lower in accuracy and precision.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for testing the insulation performance of an engine stator, which can solve the problem of lower accuracy and precision in the prior art when the insulation performance of the engine stator is tested.
In a first aspect, the present invention provides a method for testing insulation performance of an engine stator, the method comprising:
acquiring each phase of stator winding of the engine stator, and performing interference elimination treatment on each phase of stator winding; wherein the stator winding is formed by connecting at least one in-phase stator in parallel;
respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination to obtain polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data;
and if the engine stator passes the first insulation performance test, performing a second insulation performance test on the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator so as to obtain a second insulation performance test result.
In a second aspect, the present invention provides a test apparatus for insulation performance of an engine stator, the apparatus comprising:
The stator winding acquisition module is used for acquiring each phase of stator winding of the engine stator and performing interference elimination treatment on each phase of stator winding; wherein the stator winding is formed by connecting at least one in-phase stator in parallel;
the first insulation performance test module is used for respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data;
and the second insulation performance testing module is used for carrying out a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator if the engine stator passes the first insulation performance test so as to obtain a second insulation performance test result.
In a third aspect, the present invention provides an electronic device, 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 testing insulation performance of an engine stator according to any one of the embodiments of the present invention.
In a fourth aspect, a computer readable storage medium is provided, where the computer readable storage medium stores computer instructions for implementing the method for testing insulation performance of an engine stator according to any embodiment of the present invention when executed by a processor.
According to the technical scheme, through obtaining each phase of stator winding of the engine stator and conducting interference elimination processing on each phase of stator winding, conducting polarization depolarization testing on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, conducting first insulation performance testing on the engine stator based on each polarization depolarization current data, and finally conducting second insulation performance testing on the engine stator passing the first insulation performance testing according to the polarization depolarization current data corresponding to each phase of stator winding of the engine stator, so that a second insulation performance testing result is obtained, the problem that accuracy and precision are low when the insulation performance of the engine stator is tested in the prior art is solved, the insulation performance testing of the engine stator of the engine is achieved, and the insulation performance testing accuracy and precision of the engine stator are improved.
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 or to delineate the scope of the invention. Other features 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 required for the description of the embodiments will be briefly described below, and it is apparent 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 testing insulation performance of an engine stator according to a first embodiment of the present invention;
FIG. 2 is a schematic illustration of a stator winding polarization depolarization test wiring method resulting from the method provided in accordance with an embodiment of the present invention;
fig. 3 is a flowchart of a method for testing insulation performance of an engine stator according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a polarized current plot obtained by the method according to the second embodiment of the present invention;
FIG. 5 is a schematic diagram of a depolarization current graph obtained by the method according to the second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a test device for insulation performance of an engine stator according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device implementing a method for testing insulation performance of an engine stator according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which 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 present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures 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 the 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 testing insulation performance of an engine stator according to an embodiment of the present invention, where the embodiment is applicable to a case of testing insulation performance of an engine stator of an engine; the engine comprises a pumped storage engine, the method can be executed by a test device of the insulation performance of the engine stator, the test device of the insulation performance of the engine stator can be realized in a hardware and/or software mode, and the test device of the insulation performance of the engine stator can be configured in a terminal or a server with the test function of the insulation performance of the engine stator. As shown in fig. 1, the method includes:
s110, acquiring each phase of stator winding of the engine stator, and performing interference elimination processing on each phase of stator winding.
The single-phase stator winding is formed by connecting at least one branch winding in parallel.
In the prior art, the engine stator consists of a stator winding; further, the stator winding has three phases, and the three-phase winding adopts a star connection method or a triangle connection method to generate three-phase alternating current, so that the engine stator necessarily comprises three stator windings with 120-degree phase difference and different phases; further, at least one stator included in each stator winding is an in-phase stator.
The method for obtaining each phase of stator windings of the engine stator of the target transmitter to be detected, and performing interference elimination processing on each phase of stator windings comprises the following steps: and sequentially performing grounding discharge treatment and short circuit treatment on each phase of stator winding to obtain each phase of stator winding after interference elimination.
In this embodiment, the grounding discharge process specifically includes: fully grounding and discharging the stator windings of each phase to prevent residual charges in the stator windings of each phase from interfering a test result; further, the shorting process specifically includes: sequentially connecting in parallel the same-phase stators in the same stator winding by using low-resistance wires at the first two ends of all stators contained in each phase stator winding, and shorting the stator windings formed after the parallel connection so as to prevent the interference of branch stray capacitance on a test result; further, the stray capacitance is: the capacitance is not designed somewhere, but the capacitance generated somewhere due to mutual capacitance is stray capacitance because of mutual capacitance always exists between wirings.
And S120, respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data.
Wherein the polarization depolarization test specifically comprises: polarization test and depolarization test; further, the polarization test may obtain stator winding polarization current data, and the depolarization test may obtain depolarization current data of each phase of stator winding.
Specifically, the specific step flow of the polarization depolarization test comprises the following steps:
1) An adjustable DC power output instrument capable of stably outputting 250V-2500V DC voltage is selected.
2) The Pian meter with the measuring range of 0.1pA-10A is selected.
3) And numbering the stator windings of each phase as an A-phase stator winding, and numbering the stator windings of the B-phase and the C-phase stator windings respectively.
4) And carrying out polarization depolarization test of the A-phase stator winding. As shown in fig. 2, first, the first and second ends of the B, C phases are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the A-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the A-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which were the a-phase polarization current data IA. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S is recorded, which is phase A depolarization current data I' A.
And carrying out polarization depolarization test of the B-phase stator winding. First, the two ends of A, C are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the B-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the B-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which were B-phase polarization current data IB. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S is recorded, which is B phase depolarization current data I' B.
And carrying out polarization depolarization test of the C-phase stator winding. First, the two ends of A, B are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the C-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the C-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which was the B-phase polarized current data IC. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S, which is the C phase depolarization current I' C, is recorded.
Further, the specific step flow of the first insulation performance test includes: according to the polarized depolarization current data of each phase of stator winding, drawing a polarized current curve graph corresponding to each phase of stator winding by taking time as an X coordinate and taking an IA, IB and IC polarized current flow set as a Y coordinate, and comparing whether the trends of 3 curves are consistent; taking time as an X coordinate and an I ' A, I ' B, I ' C depolarization current set as a Y coordinate, drawing depolarization current graphs corresponding to each phase of stator windings, and comparing and judging whether the trends of the 3 curves are consistent; further, when the polarization current downward trend of each polarization current curve is consistent, and the depolarization current downward trend of each depolarization current curve is consistent, determining that the first insulation performance test is passed; correspondingly, when the polarization current decreasing trend of each polarization current curve is inconsistent or the depolarization current decreasing trend of each depolarization current curve is inconsistent, the first insulation performance test is determined not to pass.
And S130, if the engine stator passes the first insulation performance test, performing a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator so as to obtain a second insulation performance test result.
In this embodiment, optionally, if the engine stator passes the first insulation performance test, it is determined that the insulation performance of the engine stator is not acceptable.
As can be seen from the above steps, each stator winding has corresponding matched polarized current data and non-polarized current data, and as the engine stator has three stator windings of different phases, the polarized depolarization current data corresponding to each stator winding has six groups; further, a second insulation performance test is performed on the engine stator according to the six sets of polarized depolarized current data, so as to obtain a second insulation performance test result.
According to the technical scheme, through obtaining each phase of stator winding of the engine stator and conducting interference elimination treatment on each phase of stator winding, conducting polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, conducting first insulation performance test on the engine stator based on each polarization depolarization current data, and finally conducting second insulation performance test on the engine stator passing the first insulation performance test according to the polarization depolarization current data corresponding to each phase of stator winding of the engine stator, so that a second insulation performance test result is obtained, testing of the insulation performance of the engine stator of the engine is achieved, and accuracy and precision of the insulation performance test of the engine stator are improved.
Example two
Fig. 3 is a flowchart of a method for testing insulation performance of an engine stator according to a second embodiment of the present invention, where the method is refined based on the foregoing embodiment, and specifically in this embodiment: and refining the testing step of the second insulation performance test of the engine stator.
As shown in fig. 3, the method includes:
s310, acquiring each phase of stator winding of the engine stator, and performing interference elimination processing on each phase of stator winding.
S320, respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data.
S330, calculating to obtain an evaluation coefficient, a limit value coefficient and a difference coefficient of the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator.
In a first aspect, according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator, an evaluation coefficient of the engine stator is calculated, including: calculating and obtaining a correlation coefficient Rxy between every two stator windings according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator; when the correlation coefficient Rxy between every two stator windings is greater than 2, determining that the evaluation coefficient of the engine stator is 1; when any one of the correlation coefficients Rxy between the stator windings is not more than 2, the evaluation coefficient of the engine stator is determined to be 0.
Specifically, the formula for calculating the correlation coefficient Rxy of the stator winding is as follows:
R XY ＝-lg(1-LR XY )；
wherein, rxy is a correlation coefficient between every two stator windings, specifically, on the basis of the above steps, if each phase of stator winding is respectively numbered as an a phase stator winding, a B phase stator winding and a C phase stator winding, the correlation coefficient includes: correlation coefficients RAB, RBC, RCA for polarization test arrays IA, IB, IC and correlation coefficients R 'AB, R' BC, R 'CA for depolarization test arrays I' A, I 'B, I' C.
Further, the LRxy is a normalized covariance coefficient between the two stator windings; specifically, the calculation formula corresponding to the LRxy is：
Further, in the above formula, cxy is the covariance between the two stator windings, and Dx and Dy are the standard variances between the two stator windings; specifically, the calculation formula of Cxy is as followsCorrespondingly, the calculation formula of Dx and Dy is as follows And the X (k) and the Y (k) are polarization depolarization current data of every two corresponding stator windings, and the N is the data length of the polarization depolarization current data corresponding to each phase of stator winding.
Based on the above steps, according to the above correlation coefficient calculation formula, the correlation coefficients RAB, RBC, RCA of the polarization test arrays IA, IB, IC and the correlation coefficients R 'AB, R' BC, R 'CA of the depolarization test arrays I' A, I 'B, I' C are calculated in sequence; finally, comparing the correlation coefficient of the polarization depolarization test array with a characteristic value k, namely determining that the evaluation coefficient of the engine stator is 1 when the correlation coefficient Rxy between every two stator windings is larger than 2; when any one of the correlation coefficients Rxy between every two stator windings is not more than 2, determining that the evaluation coefficient of the engine stator is 0, and correspondingly obtaining the calculation formula of the correlation coefficient gamma is as follows:
According to a second aspect, according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator, a limit coefficient of the engine stator is calculated, and the method comprises the following steps: according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator, calculating to obtain the minimum polarization coefficient of the engine stator; acquiring an insulation limit value of the engine stator, and comparing the minimum polarization coefficient with the insulation limit value in value; when the minimum polarization coefficient is larger than the insulation limit value, determining that the limit value coefficient of the engine stator is 1; and when the minimum polarization coefficient is smaller than or equal to the insulation limit value, determining that the limit value coefficient of the engine stator is 0.
Specifically, the method for calculating the minimum polarization coefficient of the engine stator comprises the following steps: on the basis of S120, selecting the polarized depolarization current data of 15S, 60S and 600S, and calculating a polarization coefficient V according to the following calculation formula:and then respectively calculating the polarization coefficients VA, VB, VC, V ' A, V ' B, V ' C according to the calculation formula, and comparing the values of the polarization coefficients to finally obtain the minimum polarization coefficient: v (V) min ＝Min{VA、VB、VC、V′A、V′B、V′C}。
Further, the insulation limit value of the engine stator is obtained, and the minimum polarization coefficient V is obtained min Comparing with an insulation limit value k1 to obtain a limit value coefficient delta of the engine stator
In this embodiment, the insulation limit is determined by the insulation medium that makes up the engine stator; for example, if the stator insulation medium is asphalt dip or baked roll mica, k1=1.3; if the stator insulating medium is epoxy mica, k1=1.6.
In a third aspect, according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator, a difference coefficient of the engine stator is calculated, including: calculating to obtain the maximum difference percentage of the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator; obtaining an insulation difference value of the engine stator, and comparing the maximum percentage of the difference value with the insulation difference value; when the maximum percentage of the difference is greater than the insulation difference, determining that the difference coefficient of the engine stator is 1; and when the maximum percentage of the difference is smaller than or equal to the insulation difference, determining that the difference coefficient of the engine stator is 0.
Specifically, the method for calculating the maximum percentage of the difference value of the engine stator comprises the following steps:
on the basis of S120, first, the 60 th polarized current data IA (60S), IB (60S), IC (60S) of each polarized current data are selected, and the polarized current maximum values of the three stator windings are calculated:
ΔI max ＝Max{|IA(60S)-IB(60S)|，|IB(60S)-IC(60S)|，|IC(60S)
-IA (60S) |; and then calculating the maximum value of polarization currents of three stator windings: i min = { IA (60S), IB (60S), IC (60S) }; finally, calculating the polarized current difference value percentage W of the stator of the engine 1 ：Then, depolarization current data I ' A (60S), I ' B (60S), I ' C (60S) of the 60 st S of each polarization current data are selected, and then the depolarization difference percentage W of the three stator windings is calculated according to the method 2 The method comprises the steps of carrying out a first treatment on the surface of the Finally, the polarized current difference percentage W 1 And depolarization difference percentage W 2 Comparing to obtain the maximum value W between the two max As the maximum percent difference.
Further, the insulation difference value of the engine stator is obtained, and W is calculated max And comparing the difference with an insulation difference k2 to obtain a difference coefficient mu of the engine stator:
in this embodiment, the insulation difference is determined by a stator insulation medium constituting the motor stator; exemplarily, if the stator insulation medium is asphalt dip or baked roll mica, k2=80%; if the stator insulating medium is epoxy mica, k2=100%.
S240, performing a second insulation performance test on the engine stator based on the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator.
Specifically, based on the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator, performing a second insulation performance test on the engine stator, including: summing the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator to obtain a comprehensive evaluation coefficient of the engine stator; and obtaining a second insulation performance test result of the engine stator according to the comprehensive evaluation coefficient.
In this embodiment, according to the evaluation coefficient γ, the limit coefficient δ and the difference coefficient μ of the engine stator, a three-phase stator winding polarization depolarization performance comprehensive evaluation coefficient λ is obtained: λ=γ+δ+μ; further, if λ=3, judging that the insulation performance test of the engine stator is qualified, and the insulation performance of the engine stator is good; if lambda is not equal to 3, judging that the insulation performance test of the engine stator is not qualified, and the insulation performance of the engine stator is not good.
According to the technical scheme, through obtaining each phase of stator winding of the engine stator and conducting interference elimination treatment on each phase of stator winding, conducting polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, conducting first insulation performance test on the engine stator based on each polarization depolarization current data, finally calculating to obtain an evaluation coefficient, a limit value coefficient and a difference value coefficient of the engine stator according to the polarization depolarization current data corresponding to each phase of stator winding of the engine stator, conducting second insulation performance test on the engine stator based on the evaluation coefficient, the limit value coefficient and the difference value coefficient of the engine stator, testing on the insulation performance of the engine stator of the engine is achieved, and accuracy and precision of the insulation performance test of the engine stator are improved.
Detailed description of the embodiments
In order to more clearly describe the technical solution provided by the embodiment of the present invention, this embodiment will simply introduce a specific implementation scenario obtained according to this embodiment.
Step 1) selecting an adjustable direct current power output instrument capable of stably outputting 250-2500V direct current voltage, and selecting a Pian meter with the measuring range of 0.1 pA-10A;
step 2) carrying out full ground discharge on each phase of stator winding to prevent the residual charge of the stator winding from interfering a test result; at the head and tail ends of each phase of stator, sequentially shorting each branch winding of the same phase by using a low-resistance wire to prevent the branch stray capacitance from interfering the test result;
step 3) numbering the stator windings of each phase as A-phase stator windings, and B-phase stator windings and C-phase stator windings;
and 4) carrying out a polarization depolarization test of the A-phase stator winding. First, the first and second ends of B, C phases are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the A-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the A-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which were the a-phase polarization current data IA. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S is recorded, which is phase A depolarization current data I' A.
And carrying out polarization depolarization test of the B-phase stator winding. First, the two ends of A, C are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the B-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the B-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which were B-phase polarization current data IB. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S is recorded, which is B phase depolarization current data I' B.
And carrying out polarization depolarization test of the C-phase stator winding. First, the two ends of A, B are short-circuited and grounded. Then, connecting the positive electrode of the adjustable direct current power output instrument to the head end of the C-phase stator winding, and connecting the negative electrode to the ground; the positive electrode of the Pitaan meter is connected to the tail end of the C-phase stator winding, and the negative electrode is grounded. Next, the voltage range of the adjustable dc power output apparatus was adjusted to output 500V dc voltage, and 600S was continuously output, and the peacetime currents at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S, and 600S were recorded, which was the B-phase polarized current data IC. Finally, the voltage gear of the adjustable DC power output instrument is adjusted to output 0V DC voltage, and the Pitameter current at 15S, 30S, 60S, 120S, 180S, 240S, 300S, 360S, 420S, 480S, 540S and 600S, which is the C phase depolarization current I' C, is recorded.
Step 5) the obtained polarization depolarization current data of the stator windings of each phase are specifically shown in table 1:
table 1: polarized depolarization current data
Step 6) drawing A, B, C each phase stator winding polarization current curve as shown in fig. 4 and A, B, C each phase stator winding polarization current curve as shown in fig. 5 according to the polarization depolarization current data table of table 1.
From the graph, the polarization current of each polarization current curve has the same decreasing trend, and the depolarization current of each polarization current curve has the same decreasing trend, so that the first insulation performance test is determined to pass.
Step 7) based on the polarization depolarization current data in table 1, the correlation coefficients RAB, RBC, RCA of the polarization test arrays IA, IB, IC and the correlation coefficients R 'AB, R' BC, R 'CA of the depolarization test arrays I' A, I 'B, I' C are sequentially calculated to obtain: rab=3.09, rbc=3.24, rca=3.27, r ' ab=3.60, r ' bc=3.72, r ' ca=3.90.
Further, an evaluation coefficient γ=1 of the engine stator is calculated from the above data.
Step 8) calculating polarization coefficients va=2.39, vb=2.27, vc=2.37, V ' a=2.90, V ' b=3.07, V ' c=2.91, respectively, from the polarization depolarization current data of table 1, resulting in a minimum polarization coefficient V min =2.27. The insulating medium of the engine stator is epoxy mica, and the limit value k1 is 1.6. Minimum polarization coefficient V min (2.27) and a limit k1 (1.6) to obtain a limit coefficient delta=1 of the engine stator.
Step 9) selecting the 60 st polarized current data IA (60S) =348 pA, IB (60S) =434 pA, IC (60S) =390 pA, and the 60 st polarized current data I ' a (60S) =279 pA, I ' B (60S) =266 pA, and I ' C (60S) =276 pA from the polarized depolarized current data of table 1.
Calculating the polarized current difference percentage W of the stator of the engine according to a formula 1 Depolarization current difference percentage W of 24.71% and engine stator 2 =4.89%, finally, the polarization current difference percentage W 1 And depolarization difference percentage W 2 Comparing to obtain the maximum value W between the two max As the maximum percentage of difference W max ＝24.71％。
Further, the insulating medium of the engine stator is epoxy mica, the insulating difference k2 is 100%, and the difference coefficient mu=1 of the engine stator is obtained according to a formula.
Step 10), according to the evaluation coefficient gamma, the limit coefficient delta and the difference coefficient mu of the engine stator, the comprehensive evaluation coefficient lambda=3 of the polarization depolarization performance of the three-phase stator winding is obtained, the three-phase stator winding is judged to be qualified in the polarization depolarization test, and the insulation performance of the engine stator is good.
Example III
Fig. 6 is a schematic structural diagram of a testing device for insulation performance of an engine stator according to a third embodiment of the present invention. As shown in fig. 6, the apparatus includes:
a stator winding acquisition module 610, configured to acquire each phase of stator winding of the engine stator, and perform interference elimination processing on each phase of stator winding; wherein the stator winding is formed by connecting at least one in-phase stator in parallel;
the first insulation performance testing module 620 is configured to perform a polarization depolarization test on each phase of stator winding after interference is removed, obtain polarization depolarization current data corresponding to each phase of stator winding, and perform a first insulation performance test on the engine stator based on each polarization depolarization current data;
and a second insulation performance testing module 630, configured to perform a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator if the engine stator passes the first insulation performance test, so as to obtain a second insulation performance test result.
According to the technical scheme, through obtaining each phase of stator winding of the engine stator and conducting interference elimination treatment on each phase of stator winding, conducting polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, conducting first insulation performance test on the engine stator based on each polarization depolarization current data, and finally conducting second insulation performance test on the engine stator passing the first insulation performance test according to the polarization depolarization current data corresponding to each phase of stator winding of the engine stator, so that a second insulation performance test result is obtained, testing of the insulation performance of the engine stator of the engine is achieved, and accuracy and precision of the insulation performance test of the engine stator are improved.
Based on the above embodiment, the stator winding acquisition module 610 is specifically configured to:
and sequentially performing grounding discharge treatment and short circuit treatment on each phase of stator winding to obtain each phase of stator winding after interference elimination.
On the basis of the above embodiment, the second insulation performance testing module 630 further includes:
the data calculation unit is used for calculating and obtaining an evaluation coefficient, a limit value coefficient and a difference coefficient of the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator;
and the insulation performance testing unit is used for carrying out a second insulation performance test on the engine stator based on the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator.
On the basis of the above embodiment, the data calculation unit further includes:
the correlation coefficient calculating unit is used for calculating and obtaining a correlation coefficient R between every two stator windings according to the polarized depolarization current data corresponding to each phase stator winding of the engine stator xy；
An evaluation coefficient determining unit for determining a correlation coefficient R between the stator windings xy When the evaluation coefficients are all larger than 2, determining that the evaluation coefficient of the engine stator is 1; coefficient of correlation R between stator windings xy When any one of the above is not more than 2, the evaluation coefficient of the engine stator is determined to be 0.
On the basis of the above embodiment, the data calculation unit further includes:
the minimum polarization coefficient calculation unit is used for calculating the minimum polarization coefficient of the engine stator according to the polarization depolarization current data corresponding to each phase of stator winding of the engine stator;
an insulation limit value obtaining unit, configured to obtain an insulation limit value of the engine stator, and compare the minimum polarization coefficient with the insulation limit value;
a limit value coefficient determining unit configured to determine that a limit value coefficient of the engine stator is 1 when the minimum polarization coefficient is greater than the insulation limit value; and when the minimum polarization coefficient is smaller than or equal to the insulation limit value, determining that the limit value coefficient of the engine stator is 0.
On the basis of the above embodiment, the data calculation unit further includes:
the maximum difference value percentage calculation unit is used for calculating and obtaining the maximum difference value percentage of the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator;
the insulation difference value acquisition unit is used for acquiring the insulation difference value of the engine stator and comparing the maximum percentage of the difference value with the insulation difference value;
A difference coefficient determining unit configured to determine a difference coefficient of the engine stator as 1 when the maximum percentage of difference is greater than the insulation difference; and when the maximum percentage of the difference is smaller than or equal to the insulation difference, determining that the difference coefficient of the engine stator is 0.
On the basis of the above embodiment, the insulation performance test unit further includes:
the comprehensive evaluation coefficient calculation unit is used for summing the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator to obtain a comprehensive evaluation coefficient of the engine stator;
and the test result acquisition unit is used for acquiring a second insulation performance test result of the engine stator according to the comprehensive evaluation coefficient.
The test device for the insulation performance of the engine stator provided by the embodiment of the invention can execute the test method for the insulation performance of the engine stator 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 the structure 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 inventions 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 a test method for the insulation performance of the engine stator.
Accordingly, the method comprises the following steps:
acquiring each phase of stator winding of the engine stator, and performing interference elimination treatment on each phase of stator winding; wherein the stator winding is formed by connecting at least one in-phase stator in parallel;
respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination to obtain polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data;
and if the engine stator passes the first insulation performance test, performing a second insulation performance test on the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator so as to obtain a second insulation performance test result.
In some embodiments, the method of testing the insulation performance of an engine stator may be implemented as a computer program tangibly embodied on a computer readable storage medium, such as the 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 RAM 13 and executed by processor 11, one or more steps of the above-described method of testing insulation performance of an engine stator may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the test of engine stator insulation performance by any other suitable means (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 carrying out methods 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 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 present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
Claims (9)
1. A method for testing insulation performance of an engine stator, comprising:
acquiring each phase of stator winding of the engine stator, and performing interference elimination treatment on each phase of stator winding; the single-phase stator winding is formed by connecting at least one branch winding in parallel;
Respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination to obtain polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data;
if the engine stator passes the first insulation performance test, performing a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator so as to obtain a second insulation performance test result;
and performing a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator to obtain a second insulation performance test result, wherein the second insulation performance test result comprises:
according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator, calculating to obtain an evaluation coefficient, a limit value coefficient and a difference coefficient of the engine stator; the evaluation coefficient is a parameter calculated according to a correlation coefficient between every two stator windings, the limit value coefficient is a parameter calculated according to a minimum polarization coefficient and an insulation limit value of the engine stator, and the difference coefficient is a parameter calculated according to a maximum difference percentage of the engine stator and the insulation limit value; and performing a second insulation performance test on the engine stator based on the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator.
2. The method according to claim 1, wherein acquiring each phase of stator windings of an engine stator of a target transmitter to be measured and performing interference rejection processing on each phase of stator windings, comprises:
and sequentially performing grounding discharge treatment and short circuit treatment on each phase of stator winding to obtain each phase of stator winding after interference elimination.
3. The method of claim 1, wherein calculating an evaluation coefficient of the engine stator from polarized depolarization current data corresponding to each phase of stator winding of the engine stator comprises:
according to the polarization depolarization current data corresponding to each phase stator winding of the engine stator, calculating to obtain a correlation coefficient R between every two stator windings xy ；
Coefficient of correlation R between stator windings xy When the evaluation coefficients are all larger than 2, determining that the evaluation coefficient of the engine stator is 1;
coefficient of correlation R between stator windings xy When any one of the above is not more than 2, the evaluation coefficient of the engine stator is determined to be 0.
4. The method of claim 1, wherein calculating a limiting coefficient of the engine stator from polarized depolarization current data corresponding to each phase of stator winding of the engine stator comprises:
According to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator, calculating to obtain the minimum polarization coefficient of the engine stator;
acquiring an insulation limit value of the engine stator, and comparing the minimum polarization coefficient with the insulation limit value in value;
when the minimum polarization coefficient is larger than the insulation limit value, determining that the limit value coefficient of the engine stator is 1;
and when the minimum polarization coefficient is smaller than or equal to the insulation limit value, determining that the limit value coefficient of the engine stator is 0.
5. The method of claim 1, wherein calculating a difference coefficient for the engine stator from the polarized depolarization current data corresponding to each phase of stator winding of the engine stator comprises:
calculating to obtain the maximum difference percentage of the engine stator according to the polarized depolarization current data corresponding to each phase of stator winding of the engine stator;
obtaining an insulation difference value of the engine stator, and comparing the maximum percentage of the difference value with the insulation difference value;
when the maximum percentage of the difference is greater than the insulation difference, determining that the difference coefficient of the engine stator is 1;
And when the maximum percentage of the difference is smaller than or equal to the insulation difference, determining that the difference coefficient of the engine stator is 0.
6. The method of any of claims 1-5, wherein performing a second insulation performance test on the engine stator based on the evaluation coefficient, the limiting coefficient, and the difference coefficient of the engine stator comprises:
summing the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator to obtain a comprehensive evaluation coefficient of the engine stator;
and obtaining a second insulation performance test result of the engine stator according to the comprehensive evaluation coefficient.
7. An insulation performance testing device for an engine stator, comprising:
the stator winding acquisition module is used for acquiring each phase of stator winding of the engine stator and performing interference elimination treatment on each phase of stator winding; wherein the stator winding is formed by connecting at least one in-phase stator in parallel;
the first insulation performance test module is used for respectively carrying out polarization depolarization test on each phase of stator winding after interference elimination, obtaining polarization depolarization current data corresponding to each phase of stator winding, and carrying out first insulation performance test on the engine stator based on each polarization depolarization current data;
The second insulation performance testing module is used for carrying out a second insulation performance test on the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator if the engine stator passes the first insulation performance test so as to obtain a second insulation performance test result;
wherein, the second insulation performance test module includes:
the data calculation unit is used for calculating an evaluation coefficient, a limit value coefficient and a difference value coefficient of the engine stator according to polarization depolarization current data corresponding to each phase of stator winding of the engine stator, wherein the evaluation coefficient is a parameter calculated according to a correlation coefficient between every two stator windings, the limit value coefficient is a parameter calculated according to a minimum polarization coefficient and an insulation limit value of the engine stator, and the difference value coefficient is a parameter calculated according to a maximum difference percentage of the engine stator and the insulation limit value;
and the insulation performance testing unit is used for carrying out a second insulation performance test on the engine stator based on the evaluation coefficient, the limit value coefficient and the difference coefficient of the engine stator.
8. 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 testing insulation performance of an engine stator of any one of claims 1-6.
9. A computer readable storage medium storing computer instructions for causing a processor to execute the method of testing insulation performance of an engine stator according to any one of claims 1-6.
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