CN117890786A - Motor stator insulation state testing system and method based on leakage current phase deviation - Google Patents
Motor stator insulation state testing system and method based on leakage current phase deviation Download PDFInfo
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Abstract
The invention relates to a motor stator insulation state test system and a method based on leakage current phase deviation, wherein the system comprises a leakage current detection device and a computer connected with the leakage current detection device, wherein the leakage current detection device is used for collecting leakage current signals of a motor stator and transmitting the leakage current signals to the computer; the computer is used for calculating the leakage current phase difference, combining a preset fault classification table and determining a corresponding insulation state result through table lookup; the method comprises the following steps: acquiring a plurality of sample leakage current data in advance; calculating phase difference corresponding to the sample leakage current data, and constructing a fault classification table by combining the insulation state corresponding to the sample leakage current data; collecting three-phase total leakage current signals of a motor stator to be tested, and calculating corresponding total leakage current phase differences; and according to the calculated total leakage current phase difference, obtaining a corresponding insulation state result from a fault classification table in a table lookup mode. Compared with the prior art, the invention can accurately detect the early insulation state of the motor stator in a non-invasive way.
Description
Technical Field
The invention relates to the technical field of motor stator insulation monitoring, in particular to a motor stator insulation state testing system and method based on leakage current phase deviation.
Background
For insulation monitoring of a motor stator, off-line monitoring and on-line monitoring exist at present, wherein the development of an off-line monitoring technology is mature, a plurality of on-line monitoring means are based on the principle of off-line monitoring, and partial discharge on-line monitoring is a common method for current stator insulation monitoring, so that faults caused by insulation aging potentially driven by corona activity can be prevented.
In addition, the most effective method among the motor insulation state detection methods is a withstand voltage test, which is divided into a direct current withstand voltage test and an alternating current withstand voltage test. The leakage current detection is mainly used for detecting insulation resistance and current surge conditions, so as to determine whether the motor has penetration faults or insulation withstand voltage conditions.
However, in the above prior art, the off-line monitoring is generally performed according to a certain period, so that there is a serious aging condition of insulation occurring in the interval between two tests;
the partial discharge on-line monitoring needs to install special equipment, the stator insulation failure is a synergistic aging effect generated by the comprehensive effect of multiple internal and external stresses on an insulation system when a motor operates, corona is not the only root cause of the insulation failure, the partial discharge sensing period is directly connected with high-voltage, the installation range is limited, and meanwhile, higher requirements are put forward on the insulation grade of the equipment;
in addition, the breakdown voltage characteristic parameter is the only and reliable standard for measuring the insulation performance of the power equipment, but as the breakdown voltage is a destructive parameter, the withstand voltage methods such as a direct current withstand voltage method and the like damage insulation materials, and cannot be used for measuring the insulation state of the equipment in operation, the traditional leakage current detection is analyzed from a single parameter, only obvious state changes such as serious aging and the like can be carried out, and the stator insulation aging condition is difficult to accurately identify in time due to the fact that the early state is not obvious.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a motor stator insulation state testing system and a motor stator insulation state testing method based on leakage current phase deviation, which can non-invasively detect the early insulation state of a motor stator.
The aim of the invention can be achieved by the following technical scheme: the motor stator insulation state testing system based on leakage current phase deviation comprises a leakage current detection device and a computer connected with the leakage current detection device, wherein the leakage current detection device is used for collecting leakage current signals of a motor stator and transmitting the leakage current signals to the computer;
the computer is used for calculating the leakage current phase difference, and combining a preset fault classification table, and determining a corresponding insulation state result through table lookup.
Further, the leakage current detection device comprises a current sensor, an amplifying circuit module and a data acquisition unit which are sequentially connected, wherein the data acquisition unit is connected with a computer, and the current sensor is used for acquiring three-phase total leakage current parameters;
the amplifying circuit module is used for amplifying the acquired three-phase total leakage current parameters to obtain total leakage current signals, and transmitting the total leakage current signals to the computer through the data acquisition unit.
Further, rated output current of the current sensor is +/-50 mA, power supply voltage is +/-15V, bandwidth is 100KHz, precision is 0.05%, and transformation ratio is 600:1.
Further, the current measurement range of the amplifying circuit module is-1 mA, the resolution is 10nA, and the sampling rate is 25sps.
Further, three sinusoidal signal generators are arranged in the computer and connected to a single-frequency information extraction unit, the three sinusoidal signal generators are used for generating corresponding simulated three-phase leakage currents, and the single-frequency information extraction unit is used for extracting phase and amplitude information.
Further, the computer calculates the leakage current phase difference, specifically, calculates the difference between the current phase of each phase output by the single-frequency information extraction unit and the initial phase of the A phase, and then obtains the total leakage current phase difference.
Further, the frequency of the sine signal generator is 50Hz, the resolution is 5000Hz and the sampling number is 500.
A motor stator insulation state testing method based on leakage current phase deviation comprises the following steps:
s1, acquiring a plurality of sample leakage current data in advance;
s2, calculating phase differences corresponding to the sample leakage current data, and constructing a fault classification table by combining insulation states corresponding to the sample leakage current data;
s3, collecting three-phase total leakage current signals of the motor stator to be tested, and calculating corresponding total leakage current phase differences;
s3, according to the calculated total leakage current phase difference, a corresponding insulation state result is obtained by looking up a table from a fault classification table.
Further, in step S1, a For loop structure is specifically adopted to realize single-phase leakage current amplitude increment, so as to acquire a plurality of sample leakage current data including leakage current increment data, total leakage current phase and total leakage current amplitude.
Further, the fault classification table in step S2 includes a total leakage current phase variation trend, a total leakage current phase variation range, fault classification, and remark information.
Compared with the prior art, the invention has the following advantages:
the invention designs a leakage current detection device and a computer connected with the leakage current detection device, and the leakage current detection device is used for collecting leakage current signals of a motor stator and transmitting the leakage current signals to the computer; and calculating the leakage current phase difference by using a computer, and determining a corresponding insulation state result by looking up a table in combination with a preset fault classification table. The invention has universal applicability to the motor, is completely non-invasive, and has sensitivity to early insulation aging.
The invention designs a leakage current detection device which comprises a current sensor, an amplifying circuit module and a data acquisition unit which are sequentially connected, wherein the data acquisition unit is connected with a computer and acquires three-phase total leakage current parameters by using the current sensor; the amplifying circuit module amplifies the collected three-phase total leakage current parameters to obtain a total leakage current signal, the total leakage current signal is transmitted to the computer through the data collecting unit, the total leakage current phase difference is calculated in the computer, and a corresponding insulation state result can be rapidly and accurately positioned through table lookup.
The invention bypasses analysis of current characteristic frequency in a frequency domain, starts to find new characteristic parameters for judging insulation aging of a stator winding from a time domain, provides a completely non-invasive stator insulation state testing method based on leakage current phase deviation, obtains the change trend of phase angles of leakage current and total leakage current of each phase based on a plurality of sample leakage current data by combining an enumeration method to construct a fault classification table, is favorable for timely monitoring the problem existing in early stage of stator insulation, avoids irreversible damage to continuous operation of a motor, and provides early diagnosis for full life cycle management of the motor.
The scheme of the invention can be applied online: the method has the advantages that the leakage current amplitude and the phase are collected under the running state of the motor, the aging condition of the stator can be obtained through the change range and the change trend of the leakage current amplitude, and compared with the conclusion obtained through experiments, the possible aging problem of the insulation of the stator of the motor can be reduced, the identification efficiency of the insulation aging of the stator is improved, and another path is opened up for the whole life cycle management of the motor.
The scheme of the invention can realize the diversification of off-line detection parameters: the insulation resistance, insulation capacitance, dielectric loss and the like can be further calculated through the current sensor, so that the existing insulation aging condition is further determined.
Drawings
FIG. 1 is a schematic diagram of a leakage current detection device;
FIG. 2 is a schematic diagram of the operation of a computer;
FIG. 3 is a schematic flow chart of the method of the present invention;
FIGS. 4 a-4 c are graphs showing the total leakage current phase change with increased A-phase leakage current amplitude in the example;
FIGS. 5 a-5 c are graphs showing the total leakage current phase change with increased B-phase leakage current amplitude in the example;
fig. 6a to 6C show the total leakage current phase change with increased C-phase leakage current amplitude in the example.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Examples
The motor stator insulation state testing system based on leakage current phase deviation comprises a leakage current detection device and a computer connected with the leakage current detection device, wherein the leakage current detection device is used for collecting leakage current signals of a motor stator and transmitting the leakage current signals to the computer; the computer is used for calculating the leakage current phase difference, combining a preset fault classification table, and determining a corresponding insulation state result through table lookup.
As shown in fig. 1, the leakage current detection device comprises a current sensor, an amplifying circuit module and a data acquisition unit which are sequentially connected, wherein the data acquisition unit is connected with a computer, and the current sensor is used for acquiring three-phase total leakage current parameters; the amplifying circuit module is used for amplifying the acquired three-phase total leakage current parameters to obtain total leakage current signals, and transmitting the total leakage current signals to the computer through the data acquisition unit.
As shown in fig. 2, three sinusoidal signal generators are disposed in the computer, and the three sinusoidal signal generators are connected to a single-frequency information extraction unit, where the three sinusoidal signal generators are used for generating corresponding analog three-phase leakage currents, the single-frequency information extraction unit is used for extracting phase and amplitude information, and the computer calculates the leakage current phase difference, specifically, calculates the difference between the current phase of each phase output by the single-frequency information extraction unit and the initial phase of the a phase, so as to obtain the total leakage current phase difference.
Based on the system, a motor stator insulation state testing method based on leakage current phase deviation is realized, as shown in fig. 3, and the method comprises the following steps:
s1, acquiring a plurality of sample leakage current data in advance;
s2, calculating phase differences corresponding to the sample leakage current data, and constructing a fault classification table by combining insulation states corresponding to the sample leakage current data;
s3, collecting three-phase total leakage current signals of the motor stator to be tested, and calculating corresponding total leakage current phase differences;
s3, according to the calculated total leakage current phase difference, a corresponding insulation state result is obtained by looking up a table from a fault classification table.
The technical scheme is applied to the embodiment, and the main thought is as follows:
when the insulation of the motor stator is aged early, the leakage current is very weak, and the insulation problem can be diagnosed by means. When the stator winding of the motor is insulated and aged, higher harmonic waves in the stator current are obviously enhanced, and the self inductance and mutual inductance of the winding are changed, so that the phase difference between three-phase currents is also changed. Imbalance occurs in the three phases, resulting in leakage currents. The magnitude of leakage current is very weak when the motor insulation breaks down early, and the common current transformer is difficult to capture parameters. According to the scheme, the phase change condition of leakage current under different insulation aging degrees is analyzed, and the relation between the leakage current and insulation aging is extracted.
When the insulation of the motor stator is aged, namely three phases are unbalanced, leakage current is generated, the amplitude of the three phases is supposed to change, I l For total leakage current, I lA 、I lB 、I lC For each phase of leakage current, the initial A phase is 0 degrees, the B phase is 120 degrees, and the C phase is 240 degrees.
The currents of each phase being equal at three-phase balance, i.e. i=i A ＝I B ＝I C When leakage current is generated in phase A:
the phase of the leakage current is:
when phase B generates leakage current:
the phase of the leakage current is:
when the C phase generates leakage current:
the phase of the leakage current is:
according to the formulas (1), (2) and (3), it can be seen that when leakage current is generated in the single phase, the total leakage current I l However, this case requires that the currents of the other two phases remain constant and is often difficult to achieve, so that the case where the leakage current is generated in the third phase of the two-phase imbalance and the case where the leakage current is generated in the two phases are analyzed next.
When two phases generate leakage current:
the magnitude of the leakage current is:
the phase of the leakage current is:
according to the formula (5), the total leakage current is obtained when two phases generate leakage currentAmplitude of flow and leakage current (I lB 、I lC ) The size is related, but the numerical value is very small, and the requirement on a signal acquisition device is high.
From equation (6), the total leakage current I when two phases generate leakage current l Phase and leakage current (I) lB 、I lC ) The magnitude is related, but their effect of the change on the phase of the total leakage current cannot be seen from the formula, so that the analysis is performed next using computer numerical calculations using enumeration.
Specific:
I. establishing a leakage current analysis and detection model
Firstly, parameters of three-phase total leakage current are acquired through a high-precision current sensor CT, and then the acquired parameters are processed through an amplifying circuit module. The obtained phase is differed from the initial phase of the A phase, namely the total leakage current phase angle. And on the basis, analytical calculation and experiments are carried out.
In this embodiment, the current sensor index is:
rated output current: 50mA;
supply voltage: 15V;
bandwidth: 100KHz;
precision: 0.05%;
transformation ratio: 600:1.
The indexes of the amplifying circuit module are as follows:
current measurement range: -1 mA;
resolution ratio: 10nA;
sampling rate: 25sps.
II. Computer analysis system index
When two-phase leakage current is generated in the motor, the total leakage current I l The relationship between the phase angle and the phase angle is difficult to intuitively explain from theory, and the change trend in the relationship can be obtained through a computer numerical analysis method.
In the embodiment, a current model of a three-phase motor is built on a LABVIEW platform when the three-phase motor operates, three sinusoidal signal generators are firstly built, the frequency is 50Hz, the resolution is 5000Hz, the sampling number is 500, a single-frequency information extraction control is used for extracting the amplitude and the phase of the sum signal, and the effective number is six. The magnitude of the phase is obtained in the display array by varying the magnitude of the sinusoidal signal generator to simulate the generation of leakage current.
III, full sample data calculation
The single-phase leakage current amplitude increment is realized by using the For circulation structure, and the step size is 0.005A. And outputting a statistical relation graph of the leakage current increment and the total leakage current phase and the total leakage current amplitude through an xy graph control. The change trend of the phase angles of leakage currents of each phase and total leakage currents is obtained through the enumeration method. Fig. 4 a-4C show the increase in the magnitude of the phase a leakage current and the change in the phase of the total leakage current, wherein the phase angle of the total leakage current decreases from 60 degrees to 0 degrees when the phase a leakage current increases and the phase B is slightly larger than the phase C. When the leakage current of the A phase increases and the B phase is slightly smaller than the C phase, the total leakage current phase angle increases and increases from 300 degrees to 360 degrees. Fig. 5 a-5C show the increase in the magnitude of the B-phase leakage current and the change in the phase of the total leakage current, wherein the total leakage current phase angle increases from 60 degrees to 120 degrees when the B-phase leakage current increases and the a-phase is slightly larger than the C-phase. When the B phase leakage current increases, the a phase is slightly smaller than the C phase, the total leakage current phase angle decreases from 180 degrees to 120 degrees. Fig. 6 a-6C show the increase in the magnitude of the C-phase leakage current and the change in the phase of the total leakage current, wherein the phase angle of the total leakage current decreases from 300 degrees to 240 degrees when the C-phase leakage current increases and the a-phase is slightly larger than the B-phase. When the C-phase leakage current increases, the a-phase is slightly smaller than the B-phase, the total leakage current phase angle increases and increases from 120 degrees to 180 degrees. The change condition of the leakage current phase is analyzed, and the method has strong sensitivity to the change of weak three-phase leakage current and has characteristic change trend of the phase. It can be seen that when a certain phase of the motor generates leakage current, the magnitude of the other two phases can influence the change trend of the phase angle of the total leakage current. The possible three-phase insulation problem of the motor can be reduced by collecting the phase angle change range and the change trend of the leakage current.
IV, data Classification
By analyzing the change trend of various single-phase leakage current increases and total leakage current phase angles, obvious regularity can be observed, and the motor stator insulation fault classification diagram based on leakage current phase angle deviation shown in table 1 is obtained through classification processing. Therefore, the problems existing in the early stage of stator insulation can be monitored, irreversible damage to the continuous operation of the motor is avoided, and early diagnosis is provided for the full life cycle management of the motor.
TABLE 1
In summary, the method bypasses analysis of the characteristic frequency of the current in the frequency domain, starts from the time domain, searches for new characteristic parameters for judging insulation aging of the stator winding, and provides a completely non-invasive stator insulation online test scheme based on leakage current phase angle deviation, wherein a judgment method is determined based on a full data characteristic analysis algorithm of a model, the aging degree of the stator insulation is detected by adopting the leakage current phase angle deviation, the wiring mode of the motor is not required, and no additional signal is injected or the motor is modified. Has universal applicability to motors and is completely non-invasive. Has sensitivity to early aging of insulation.
Furthermore, determining hardware requirements based on data validation of actual testing ensures that the application is satisfied. The process is characterized in that: the scheme is that a current balance type high-precision current sensor is required to collect leakage current signals, the signals are processed through an amplifying circuit, and the phase difference can be calculated in a computer through an acquisition card. The insulation problem existing in a certain phase can be positioned by a table look-up method, the hardware index is optimized, the consistency of the test result model is ensured, and the practical application is met.
According to the scheme, the leakage current phase angle deviation is applied to early diagnosis of insulation aging of a high-voltage motor, and the motor insulation is not damaged and the detection information is rich; in practical application, a preferable chip, a three-layer PCB and a fully differential design weak current detection device can be adopted, so that noise interference is effectively filtered, and the resolution of weak current detection is 10nA; and analyzing the change trend of the leakage current phase by adopting an enumeration method, and obtaining the magnitude relation between the three-phase currents through the change trend. The scheme has accurate measurement and test, and can perform more accurate state evaluation on the insulation early state; and on the basis of acquiring a large amount of high-precision data, data mining and fusion can be performed to acquire more insulation special diagnosis parameters such as capacitance, dielectric loss angle and the like.
Claims (10)
1. The motor stator insulation state testing system based on leakage current phase deviation is characterized by comprising a leakage current detection device and a computer connected with the leakage current detection device, wherein the leakage current detection device is used for collecting leakage current signals of a motor stator and transmitting the leakage current signals to the computer;
the computer is used for calculating the leakage current phase difference, and combining a preset fault classification table, and determining a corresponding insulation state result through table lookup.
2. The motor stator insulation state testing system based on leakage current phase deviation according to claim 1, wherein the leakage current detection device comprises a current sensor, an amplifying circuit module and a data acquisition unit which are sequentially connected, the data acquisition unit is connected with a computer, and the current sensor is used for acquiring three-phase total leakage current parameters;
the amplifying circuit module is used for amplifying the acquired three-phase total leakage current parameters to obtain total leakage current signals, and transmitting the total leakage current signals to the computer through the data acquisition unit.
3. The motor stator insulation state testing system based on leakage current phase deviation according to claim 2, wherein rated output current of the current sensor is +/-50 mA, power supply voltage is +/-15V, bandwidth is 100KHz, accuracy is 0.05%, and transformation ratio is 600:1.
4. The system for testing the insulation state of the motor stator based on the phase deviation of the leakage current according to claim 2, wherein the current measurement range of the amplifying circuit module is-1 mA to 1mA, the resolution is 10nA, and the sampling rate is 25sps.
5. The motor stator insulation state testing system based on leakage current phase deviation according to claim 1, wherein three sinusoidal signal generators are arranged in the computer, the three sinusoidal signal generators are connected to a single-frequency information extraction unit, the three sinusoidal signal generators are used for correspondingly simulating generation of three-phase leakage current, and the single-frequency information extraction unit is used for extracting phase and amplitude information.
6. The system for testing the insulation state of the motor stator based on the leakage current phase deviation according to claim 5, wherein the computer calculates the leakage current phase difference by calculating the difference between the current phase of each phase output by the single-frequency information extraction unit and the initial phase of the phase A, so as to obtain the total leakage current phase difference.
7. The system for testing the insulation state of the motor stator based on the phase deviation of the leakage current according to claim 5, wherein the frequency of the sinusoidal signal generator is 50Hz, the resolution is 5000Hz and the sampling number is 500.
8. A motor stator insulation state testing method using the motor stator insulation state testing system based on the leakage current phase deviation as claimed in claim 1, comprising the steps of:
s1, acquiring a plurality of sample leakage current data in advance;
s2, calculating phase differences corresponding to the sample leakage current data, and constructing a fault classification table by combining insulation states corresponding to the sample leakage current data;
s3, collecting three-phase total leakage current signals of the motor stator to be tested, and calculating corresponding total leakage current phase differences;
s3, according to the calculated total leakage current phase difference, a corresponding insulation state result is obtained by looking up a table from a fault classification table.
9. The system of claim 8, wherein the step S1 is specifically implemented by using a For loop structure to realize single-phase leakage current amplitude increment, so as to acquire a plurality of sample leakage current data including leakage current increment data, total leakage current phase and total leakage current amplitude.
10. The system according to claim 9, wherein the fault classification table in the step S2 includes a total leakage current phase variation trend, a total leakage current phase variation range, a fault classification, and remark information.
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