CN113219313A - Method for testing maximum steady-state impact voltage and variable frequency motor - Google Patents
Method for testing maximum steady-state impact voltage and variable frequency motor Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—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
- G01R31/1227—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
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—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
- G01R31/1227—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
- 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
- G01R31/1272—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 of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a method for testing maximum steady-state impact voltage and a variable frequency motor, wherein the method comprises the following steps: testing the corona resistant time of the corona resistant material under different steady state impact voltages to obtain at least two groups of sampling data; selecting a life curve equation of the corona-resistant material, and taking logarithms at two sides of the equation of the life curve equation to form an equation to be solved; substituting the sampling data into an equation to be solved for fitting to obtain a fitting equation of the steady-state impact voltage and the corona resistant time; and calculating the maximum steady-state impact voltage according to the value range of the corona resistant time on the basis of a fitting equation. The method can solve the maximum steady-state impact voltage of corona-resistant materials with different specifications, and is simple to operate and high in accuracy.
Description
Technical Field
The invention relates to the technical field of voltage testing, in particular to a method for testing maximum steady-state impact voltage and a variable frequency motor.
Background
With the rapid development of electronic technology, frequency conversion equipment is increasingly applied to various occasions, and for example, a common frequency conversion motor is widely applied to the fields of alternating current speed change and new energy due to the advantages of high energy efficiency, strong controllability and the like. However, the cable connecting the inverter motor and the power supply can generate wave reflection and refraction, so that extremely high overvoltage is generated at the inlet of the inverter motor, the electrical aging and the thermal aging of the insulating material are aggravated, and the service life of the inverter motor is shortened.
In recent years, corona-resistant enameled wires used by variable frequency motors have excellent corona resistance, and the service life of the alternating current variable frequency motors can be greatly prolonged. The service life of the corona-resistant enameled wire is related to the steady-state impact voltage borne by the corona-resistant enameled wire, the actual operating conditions of the variable frequency motor are simulated by using the parameters (steady-state impact voltage, frequency, temperature, rising edge time, duty ratio and the like) of a corona-resistant tester in the production process, the corona-resistant time under different steady-state impact voltages is obtained through testing, and the corona-resistant time represents the service life of the corona-resistant enameled wire. Researches show that the service life of the corona-resistant enameled wire can be obviously shortened by increasing the steady-state impact voltage, and the maximum steady-state impact voltage of the corona-resistant enameled wire is generally required to be tested in order to ensure the running safety of the variable frequency motor, so that the maximum service voltage of the variable frequency motor is determined.
The maximum steady state impact voltage of a common corona-resistant testing instrument is about 4 kV, the maximum steady state impact voltage can be tested by using a corona-resistant enameled wire with the conductor diameter smaller than 0.60 mm, but when the conductor diameter is larger than 0.60 mm, the maximum steady state impact voltage of the corona-resistant enameled wire is higher than 4 kV and exceeds the range of the testing instrument, and the maximum steady state impact voltage of a large-size corona-resistant enameled wire cannot be tested.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the maximum steady-state impact voltage testing method and the variable frequency motor.
The invention adopts the technical scheme that a test method for designing the maximum steady-state impact voltage comprises the following steps:
testing the corona resistant time of the corona resistant material under different steady state impact voltages to obtain at least two groups of sampling data;
selecting a life curve equation of the corona-resistant material, and taking logarithms at two sides of the equation of the life curve equation to form an equation to be solved;
substituting the sampling data into an equation to be solved for fitting to obtain a fitting equation of the steady-state impact voltage and the corona resistant time;
calculating the maximum steady-state impact voltage according to the value range of the corona-resistant time on the basis of a fitting equation, wherein the value range of the corona-resistant time is as follows: t is more than 0.
Preferably, acquiring at least two sets of sample data comprises: the corona-resistant material is tested for N times under the same steady-state impact voltage, N corona-resistant times obtained through testing are processed to obtain effective corona-resistant time, and each steady-state impact voltage and the corresponding effective corona-resistant time form a group of sampling data.
Preferably, the step of processing the N tested corona resistance times to obtain the effective corona resistance time comprises: n corona resistant times are arranged from small to large, the average value of the minimum value and the intermediate value is taken as the effective corona resistant time, and N is an odd number.
Preferably, the life curve equation is T = AeB/UOr T = KU-nT is corona resistance time, U is steady-state surge voltage, A, B, KAnd n is a constant.
In one embodiment, the equation to be solved is obtained by taking the logarithm of the base e at the same time on both sides of the equation of the life curve equation.
In yet another embodiment, the equation to be solved is derived by taking the logarithm of the base of any positive integer simultaneously on both sides of the equation of the lifetime curve equation.
Preferably, the corona-resistant material is any one of a corona-resistant enameled wire, a corona-resistant sintered wire, a corona-resistant flat wire and a corona-resistant film.
Preferably, the corona resistant material is tested by adopting a corona resistant tester, the corona resistant tester is provided with five channels which work independently, and the five channels simultaneously test the corona resistant material under the same steady-state impact voltage to obtain five corona resistant times.
The present invention also provides a variable frequency motor, comprising: the testing method is adopted for testing the maximum steady-state impact voltage of the power line, and the maximum steady-state impact voltage is used as the highest service voltage of the variable frequency motor capable of running safely.
Compared with the prior art, the method utilizes the life curve equation of the corona-resistant material, fits the fitting equation which is the relation curve of the corona-resistant time and the steady-state impact voltage through multiple groups of sampling data, deduces the fitting equation according to the value range of the corona-resistant time, solves the maximum steady-state impact voltage of the corona-resistant material, and can be widely applied to corona-resistant materials of different specifications and varieties.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a flow chart of the testing principle of the present invention.
Detailed Description
The testing method provided by the invention can be applied to any equipment with corona-resistant materials, and for convenience of understanding, taking a variable frequency motor as an example, the variable frequency motor comprises the following steps: the testing method is adopted for testing the maximum steady-state impact voltage of the power line, and the maximum steady-state impact voltage is used as the highest service voltage of the variable frequency motor capable of running safely.
As shown in fig. 1, the specific test method includes the following steps:
step 1, testing the corona resistant time of the corona resistant material under different steady state impact voltages, and acquiring at least two groups of sampling data, wherein each group of sampling data consists of the steady state impact voltage and the corresponding corona resistant time.
The sampling data is obtained by testing the corona-resistant material for N times under the same steady-state impact voltage, and processing N corona-resistant times obtained by testing to obtain effective corona-resistant time, wherein the effective corona-resistant time and the steady-state impact voltage matched with the effective corona-resistant time form a group of sampling data.
In order to avoid the influence of errors of sampling data on the accuracy of the maximum steady-state impact voltage, in a preferred embodiment, N is an odd number, namely, the corona-resistant material is tested for an odd number of times under the same steady-state impact voltage, the N corona-resistant times obtained by testing are processed in a heating mode that the N corona-resistant times are arranged from small to large, and the average value of the minimum value and the intermediate value is taken as the effective corona-resistant time.
It should be noted that, even under the same test condition, the corona resistant time of the same corona resistant material may be 30h, 70h or even 120h, and the data dispersion is very large, therefore, usually, under the same test condition, the corona resistant material is tested for many times, more than half of the corona resistant time in N tests exceeds the set value, i.e. the test is determined to be qualified, the data which does not exceed the set value is removed when the N corona resistant time data are processed, the data which exceeds the set value is retained, and the effective corona resistant time is calculated, where the set value can be set according to the actual situation, for example, 0.1h, 0.5h, and the like.
Furthermore, in order to improve the convenience of operation, a common corona-resistant tester on the market is adopted to test the corona-resistant material, the corona-resistant tester usually has five channels which work independently, the five channels are not different, each channel has an independent system, each channel can be subjected to independent parameter setting (such as corona-resistant test voltage, frequency, rising edge time and the like) through a computer, during testing, the five channels simultaneously test the corona-resistant material under the same steady-state impact voltage to obtain five corona-resistant time, and three or four samples in the five samples meet the test requirements, namely, the samples are judged to be qualified.
And 2, selecting a life curve equation of the corona-resistant material, and simultaneously taking logarithms on two sides of the life curve equation to form an equation to be solved.
The life curve equation can be chosen as T = AeB/UOr T = KU-nT is corona resistance time, U is steady-state impulse voltage, and A, B, K, n is a constant. The life curve equation provided by the invention only plays a role of example, the life curve equations of different corona-resistant materials are generally disclosed and can be obtained through query of periodicals, documents and the like. In practical application, a life curve equation corresponding to the variety of the corona-resistant material is selected according to the variety of the corona-resistant material, and the corona-resistant material can be any one of a corona-resistant enameled wire, a corona-resistant sintered wire, a corona-resistant flat wire and a corona-resistant film.
The equation to be solved is obtained by taking e as the base logarithm on both sides of the equation of the life curve equation, or taking any positive integer as the base logarithm on both sides of the life curve equation, such as Log2(T)、Log3(T)、Log4(T)、Log5(T)、Logn(T) (wherein n is an integer greater than 1), and the like. When the life curve equation contains e, the logarithm taking e as the base can be simultaneously taken from two sides of the equation of the life curve equation to obtain the equation to be solved, and the calculation of the equation to be solved is simplified most. The effect of taking logarithm of the life curve equation is to simplify the calculation process, so that the sampled data is conveniently substituted in the step 3 to determine the coefficient of the fitting equation.
And 3, substituting the sampling data into an equation to be solved for fitting to obtain a fitting equation of the steady-state impact voltage and the corona resistant time, and calculating the maximum steady-state impact voltage according to the value range of the corona resistant time on the basis of the fitting equation.
The sampling data can be subjected to fitting analysis by utilizing software such as Minitab and Origin, the fitting result is a fitting equation, the right side of the fitting equation is the logarithm of the corona-resistant time, the left side of the fitting equation is a formula containing the steady-state impact voltage, the maximum steady-state impact voltage is calculated according to the value range of the corona-resistant time on the basis of the fitting equation, and the value range of the corona-resistant time is as follows: t is more than 0, which is the limit value of the minimum corona resistance time, the steady-state impact voltage obtained by solving on the basis corresponds to the maximum limit value, when T is more than 0, the logarithm of the corona resistance time is also more than 0, namely the equation containing the steady-state impact voltage is more than 0, the equation is solved to obtain the range of the steady-state impact voltage, and therefore the maximum steady-state impact voltage is determined.
It should be noted that the sequence of the step 1 and the step 2 may be exchanged or performed synchronously, that is, the life curve equation is selected and converted into the equation to be solved, and then the corona-resistant material is tested to obtain the sampling data, which is not limited in the present invention.
The following provides a detailed description of the examples.
As shown in FIG. 1, corona resistant enameled wires with a conductor of 0.60 mm and a paint film thickness of 74 um in the first embodiment were used as corona resistant materials, and the corona resistant time of samples under different steady-state impact voltages (3.7 kV, 3.5 kV, 3.0 kV and 2.5 kV) was tested.
| voltage/kV | Channel 1 | Channel 2 | Channel 3 | Channel 4 | Channel 5 | Corona resistance time/h |
| 3.7 | 1.526 | 1.393 | 1.121 | 1.188 | 1.304 | 1.213 |
| 3.5 | 1.814 | 2.350 | 2.104 | 2.799 | 1.976 | 1.959 |
| 3.0 | 6.931 | 4.922 | 5.639 | 4.625 | 4.305 | 4.614 |
| 2.5 | 56.129 | 19.735 | 27.692 | 16.284 | 73.248 | 21.988 |
Table 1: corona resistance time of enameled wire under different voltages
Selecting a life curve equation: t = AeB/UThe equality being taken on both sides simultaneouslyThe logarithm of base e is given as:
the voltage and corona resistance time shown in Table 1 were respectively represented by reciprocal (1/U) and logarithmic (Ln (T)).
Table 2: voltage, corona resistant time data conversion
The fitting analysis was performed on the two columns of data 1/U, Ln (T) in Table 2, and the results after fitting were as follows: ln (T) = -5.647 + 21.774/U.
The corresponding voltage is substituted into the fitting curve to obtain a corresponding fitting value, and the fitting value is compared with the measured value (as shown in table 3), so that the measured value is not much different from the fitting value, and the fitting equation is proved to have better accuracy.
Table 3: measured value and fitting value of corona resistance time under each voltage
Lifetime dependent curve equation (T = Ae)B/U) The middle T has practical physical significance and represents the corona resistant time which must be more than 0, so that the value range of T is T>0, so after T takes the logarithm, Ln (T)>0, i.e.
-5.647 + 21.774/U > 0
Obtaining by solution: u < 3.85
Therefore, the maximum steady-state impact voltage of the corona-resistant enameled wire is about 3.85 kV.
After the maximum steady-state impact voltage is calculated, the corona resistance test voltage is respectively increased to 3.80 kV, 3.85 kV and 3.90 kV, and the corona resistance time under each voltage is respectively tested.
| voltage/kV | Channel 1 | Channel 2 | Channel 3 | Channel 4 | Channel 5 |
| 3.80 | 0.041 | 1.072 | 0.037 | 1.206 | 1.045 |
| 3.85 | 0.041 | 0.039 | 0.968 | 0.041 | 0.037 |
| 3.90 | 0.039 | 0.039 | 0.035 | 0.013 | 0.038 |
Table 4: corona resistance time of enameled wire under different voltages
As can be seen from Table 4, at voltages of 3.80 kV and 3.85 kV, only individual channels were able to measure the corona resistance time of the samples, while at a voltage of 3.90 kV, the corona resistance time of all channel samples failed, and it was further confirmed that the maximum steady-state impact voltage of the corona-resistant enameled wire of this specification was about 3.85 kV. Tables 3 and 4 in this embodiment are only verification data in the design process of the test method, and may be omitted in practical application, and the maximum steady-state impact voltage is obtained by directly calculating from a fitting equation.
The conditions in the second embodiment are the same as those in the first embodiment except that the life curve equation is changed to T = KU-nRepeating the same steps to obtain the fitting relation between T and U as follows: ln (T) = -7.205Ln (U) + 9.614, let Ln (T)>0, solved to obtain U<3.798. Thus, the maximum steady state surge voltage determined by this method is about 3.798 kV.
The method can solve the maximum steady-state impact voltage of the corona-resistant enameled wire under any paint film thickness (1-grade paint film, 2-grade paint film and 3-grade paint film), and only makes clear requirements on the steady-state impact voltage of the corona-resistant enameled wire under the 2-grade paint film thickness and the 3-grade paint film thickness in the national standard (GB/T4074.21-2018), so that the method is provided for selecting the steady-state impact voltage under the 1-grade paint film thickness.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for testing the maximum steady-state impact voltage is characterized by comprising the following steps of:
testing the corona resistant time of the corona resistant material under different steady state impact voltages to obtain at least two groups of sampling data;
selecting a life curve equation of the corona-resistant material, and taking logarithms at two sides of the life curve equation to form an equation to be solved;
substituting the sampling data into the equation to be solved for fitting to obtain a fitting equation of the steady-state impact voltage and the corona resistant time;
and calculating the maximum steady-state impact voltage according to the value range of the corona resistant time on the basis of the fitting equation.
2. The test method of claim 1, wherein obtaining at least two sets of sample data comprises: the corona-resistant material is tested for N times under the same steady-state impact voltage, N corona-resistant times obtained through testing are processed to obtain effective corona-resistant time, and each steady-state impact voltage and the corresponding effective corona-resistant time are a set of sampling data.
3. The method of claim 2, wherein processing the N tested corona resistance times to obtain an effective corona resistance time comprises: n corona resistant times are arranged from small to large, the average value of the minimum value and the intermediate value is taken as the effective corona resistant time, and N is an odd number.
4. The test method of claim 1, wherein the life curve equation is T = AeB/UOr T = KU-nT is corona resistance time, U is steady-state impulse voltage, and A, B, K, n is a constant.
5. The test method of claim 1, wherein the equation to be solved is obtained by taking e-based logarithm on both sides of the equation of the life curve equation.
6. The test method of claim 1, wherein the equation to be solved is obtained by taking logarithm of the base of any positive integer at both sides of the equation of the lifetime curve equation.
7. The test method according to claim 1, wherein the corona-resistant material is any one of a corona-resistant enameled wire, a corona-resistant sintered wire, a corona-resistant flat wire, and a corona-resistant film.
8. The test method according to any one of claims 1 to 7, wherein the corona resistance time is in a range of: t is more than 0.
9. The method of any one of claims 1 to 7, wherein the corona resistant material is tested using a corona resistant tester having five channels operating independently, the five channels testing the corona resistant material simultaneously at the same steady state impact voltage for five corona resistant times.
10. Inverter motor includes: the motor comprises a motor body and a power line for connecting the motor body and a power supply, and is characterized in that the power line is used for testing the maximum steady-state impact voltage by adopting the testing method of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113726254A (en) * | 2021-09-06 | 2021-11-30 | 广州小鹏汽车科技有限公司 | Control method and device for high-voltage motor |
| CN113726254B (en) * | 2021-09-06 | 2024-09-03 | 广州小鹏汽车科技有限公司 | Control method and device for high-voltage motor |
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| CN113726254B (en) * | 2021-09-06 | 2024-09-03 | 广州小鹏汽车科技有限公司 | Control method and device for high-voltage motor |
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