CN109521339B - Power frequency parallel resonance voltage withstand test method based on non-full compensation - Google Patents
Power frequency parallel resonance voltage withstand test method based on non-full compensation Download PDFInfo
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Abstract
The invention discloses a power frequency parallel resonance withstand voltage test method based on non-full compensation, which comprises the following steps: step 1, establishing a non-full-compensation-based power frequency parallel resonance voltage-withstanding test model; step 2, comparing the tested products in the pressure-resistant test modelValue of capacitive current flowing inCAnd rated output current value I of high-voltage end of power frequency step-up transformer in voltage-withstanding test model2(ii) a If ICIs greater than I2And calculating the inductance L of the compensation reactors which need to be connected in parallel at two ends of the tested object during full compensationqConnecting a compensation reactor with inductance L in parallel at two ends of the tested object for compensation, and executing the step 3; if ICIs less than or equal to I2Then, a withstand voltage test was performed. The invention greatly reduces the capacity requirements on the power frequency step-up transformer and the field power frequency test power supply, and reduces the volume and the weight of the power frequency step-up transformer.
Description
Technical Field
The invention relates to a resonance voltage withstand test method of a power system, in particular to a power frequency parallel resonance voltage withstand test method based on non-full compensation.
Background
At present, in a power distribution network of a power system, medium and low voltage power cables of 35kV or less and power transformers of 35kV or less are widely used. According to the requirements of GB50150-2016 (Standard for testing the transfer of Electrical devices in Electrical installation engineering) standards, an alternating-current voltage withstand test must be carried out on equipment such as medium-voltage and low-voltage power cables, transformers and the like before operation. Wherein, the medium and low voltage power cable of 35kV or less is required to be 2U within the frequency range of 20-300 Hz0Performing an alternating current withstand voltage test for 60 min; while a power transformer of 35kV or less is required to perform an AC withstand voltage test with a duration of up to 68kV for 1min in a frequency range of 40Hz or more. Aiming at large-capacitance tested products such as medium and low voltage power cables of 35kV and below, power transformers of 35kV and below and the like widely used in the current power system, the alternating current withstand voltage test voltage is generally not very high but the test current may be relatively large, and a power frequency withstand voltage test method, a variable frequency series resonance withstand voltage test method and a parallel resonance withstand voltage test method are mainly adopted.
As shown in fig. 2, the test apparatus for the power frequency withstand voltage test method is composed of a power frequency step-up transformer and a capacitive voltage divider, wherein the power frequency step-up transformer increases the voltage (0-220V or 0-380V) of the power frequency test power supply to the test voltage required by the tested object, if the capacitance of the tested object is large, due to the leakage reactance of the power frequency step-up transformer, an obvious capacitance rise effect is generated in the circuit, and therefore, the capacitive voltage divider must be used to directly measure the test voltage applied to the tested object.
The larger the capacitance of the sample, the larger I ═ ω CGeneral assemblyU(CGeneral assemblyThe total capacitance of the tested object and the capacitive voltage divider after being connected in parallel), the required power frequency booster transformer capacity is obtainedThe larger the power frequency test power supply, the larger the power frequency test power supply capacity requirement is. I ═ ω CGeneral assemblyI in the formula U is the current flowing through the high-voltage side of the power frequency boosting transformer; ω 2 pi f is the angular frequency, f is the power frequency; cGeneral assemblyIs a tested article CxAnd a capacitive voltage divider (C)1Is a high-voltage capacitor, C2Is a low voltage capacitor) of the total capacitance
U is a tested article CxWith the test voltage applied. A capacitive voltage divider is a tool for measuring the voltage on a test object, and the capacitance C of a high-voltage arm and a low-voltage arm of the capacitive voltage divider1And C2Is stationary.
As shown in fig. 3, the test apparatus of the variable frequency series resonance withstand voltage test method is composed of a variable frequency power supply, an excitation transformer, a resonance reactor, and a capacitive voltage divider. (1) The variable frequency power supply converts a power frequency test power supply into a power supply capable of continuously adjusting frequency (20-300 Hz) and voltage, and provides power for the whole resonant circuit. (2) The exciting transformer is mainly used for increasing the voltage output by the variable frequency power supply to a proper value. (3) The resonant reactor is an important part of a resonant circuit, and when the output frequency of the variable-frequency power supply is equal to the natural frequency of a system, series resonance occurs in a system loop. The reactor group can be used in series or in parallel according to the actual condition of a tested product to meet the requirements of a test circuit on voltage, current and frequency. (4) The capacitive voltage divider is mainly used for measuring external applied voltage on a tested product and consists of a high-voltage arm capacitor C1And a low-arm capacitor C2Series connection of low-voltage arm C measured by voltmeter2Voltage on, then calculates the high voltage arm C according to the voltage division ratio1The voltage of (c). The frequency conversion series resonance voltage withstand test method has the disadvantages of more devices, complex structure, large volume, heavy weight and inconvenience in transportation. And when the capacitance of the tested product is larger, the capacities of the needed excitation transformer, the variable frequency power supply and the power frequency test power supply are also larger, so that the capacity of the field test power supply cannot meet the requirement easily.
As shown in FIG. 4, the test model of the parallel differential compensation power frequency withstand voltage test method comprisesThe power frequency boosting transformer, the compensation reactor and the compensation capacitor. The parallel differential compensation power frequency voltage withstand test method adopts complete compensation, the compensation precision of a compensation reactor needs to reach 1mH, and the compensation precision of a compensation capacitor needs to reach 1 pF. After the capacitance of the tested object is accurately compensated by the compensating reactor and the compensating capacitor, the inductive reactance and the capacitive reactance of the whole circuit are equal to each other at power frequency
The method can effectively reduce the capacities of the power frequency step-up transformer and the power frequency test power supply, but the compensation reactor and the compensation capacitor are generally adjustable due to the adoption of accurate compensation, the structure is complex, the reliability is low, and the field carrying is inconvenient. The formula required to be met by complete compensation of the parallel differential compensation power frequency voltage withstand test method is
U in the formulaxL is the inductance of the compensation reactor, C is the test voltage applied to the test objectxIs the capacitance, C, of the tested articlebThe capacitance of the compensating capacitor is used, and G is the total conductance of the compensating reactor and the power frequency step-up transformer. The total current has a magnitude of
By arranging a compensating reactor L and a compensating capacitor CbMake the inductive current I in the formulaLAnd a capacitive current ICComplete cancellation (i.e., complete parallel resonance occurs) and the withstand voltage test is performed.
The disadvantages of the above-mentioned methods are respectively as follows:
the power frequency withstand voltage test method is mainly realized by adopting a power frequency boosting test transformer, when the capacitance of a tested object is larger, the power frequency boosting test transformer is required to have larger capacity, so that the power frequency boosting test transformer is large in size, heavy in weight and inconvenient to carry on site, and the capacity of a power supply for the on-site test is difficult to meet the test requirement when the capacitance of the tested object is larger.
In the frequency conversion series resonance withstand voltage test method, when the capacitance of a tested product is large, a mode that a plurality of sections of resonance reactors are connected in parallel is needed to ensure that the resonance frequency of a circuit is within the frequency range required by the test (20-300 Hz of a power cable and 40Hz or above of a power transformer). The whole set of test device is large in size, heavy in weight and inconvenient to carry on site. When the capacitance of the tested object is large, the problem that the capacitance of the field test power supply is difficult to meet the test requirement also exists.
The parallel resonance voltage withstand test method is divided into a frequency conversion parallel resonance voltage withstand test method and a power frequency parallel resonance voltage withstand test method. The frequency conversion parallel resonance withstand voltage test method is rarely adopted, mainly because when parallel resonance occurs, the voltage of a tested product is equal to the voltage of a resonance reactor and is also equal to the voltage of the high-voltage side of an excitation transformer. That is, the excitation transformer needs to output higher test voltage, which causes the insulation part of the excitation transformer to be greatly increased, and is inconvenient for manufacturing and field transportation. In addition, a power frequency parallel resonance withstand voltage test method is adopted, and a power frequency boosting transformer of the method has smaller mass and volume compared with a variable frequency excitation transformer, but can realize accurate compensation of inductive reactance to capacitive reactance in the whole circuit only by additionally adding a parallel compensation capacitor. The device has high precision requirement, so the structure is more complex and the reliability is not high.
Disclosure of Invention
In order to solve the technical problems, the invention provides a power frequency parallel resonance voltage withstand test method based on non-full compensation.
The invention is realized by the following technical scheme:
the power frequency parallel resonance withstand voltage test method based on non-full compensation comprises the following steps: step 1, establishing a non-full-compensation-based power frequency parallel resonance voltage-withstanding test model; step 2, comparing the value I of the capacitive current flowing on the tested object in the voltage-withstanding test modelCAnd rated output current value I of high-voltage end of power frequency step-up transformer in voltage-withstanding test model2(ii) a If ICIs greater than I2And calculating the inductance L of the compensation reactors which need to be connected in parallel at two ends of the tested object during full compensationqAnd the two ends of the tested product are connected with a compensation reactor with inductance L in parallel for compensationExecuting the step 3; if ICIs less than or equal to I2Then, carrying out a pressure resistance test; step 3, after the compensation reactors are connected in parallel at the two ends of the tested object, calculating the total current I output by the high-voltage end of the power frequency boosting transformerGeneral assembly，IGeneral assemblyAccording to the formula
Obtaining and comparing the total current I output by the high-voltage end of the power frequency step-up transformerGeneral assemblyRated output current value I of high-voltage end of power frequency booster transformer2(ii) a If IGeneral assemblyIs greater than I2If yes, continuing to increase the parallel compensation reactor at the two ends of the tested object to change the value of L, and re-executing the step 3; if IGeneral assemblyIs less than or equal to I2Then, a withstand voltage test was performed.
Further, in step 1, the voltage withstand test model comprises a power frequency test power supply, a power frequency step-up transformer, a compensation reactor and a tested object, wherein the power frequency test power supply is connected to the low-voltage end of the power frequency step-up transformer, and the tested object is connected with the compensation reactor in parallel and then connected to the high-voltage end of the power frequency step-up transformer.
Further, in step 2, the value of the capacitive current I flowing through the sample in the pressure resistance test modelCBy the formula IC＝ωCxU is calculated, wherein ω -2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article, and U is the test voltage applied to the test article.
Further, in step 2, the inductance L of the compensation reactor required for full compensationqAccording to the capacitance C of the tested objectxObtaining under power frequency; inductance LqBy the formula
Calculated, where ω ═ 2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article.
Further, the number of the compensation reactors is at least one, and the inductance of each compensation reactor is a fixed value.
Furthermore, the inductance of the compensation reactor is 20H-200H.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with a power frequency withstand voltage test method and a variable frequency series resonance withstand voltage test method, the invention omits a capacitive voltage divider, greatly reduces the capacity requirements on a power frequency boosting test transformer and a field test power supply, reduces the volume and the weight of the power frequency boosting test transformer, and is convenient for field transportation;
2. compared with the parallel differential compensation power frequency voltage withstand test method, the method has the advantages that the compensation accuracy requirement of the inductance value of the reactor is greatly reduced, the compensation capacitor can be omitted, the difficulty degree of the voltage withstand test is greatly reduced, and the whole device is simpler and more reliable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a diagram of a testing apparatus of a power frequency parallel resonance withstand voltage testing method based on non-full compensation according to the present invention;
FIG. 2 is a diagram of a test apparatus for a power frequency withstand voltage test method;
FIG. 3 is a diagram of a testing apparatus for a variable frequency series resonance withstand voltage testing method;
FIG. 4 is a diagram of a testing apparatus of a parallel differential compensation power frequency withstand voltage testing method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The power frequency parallel resonance withstand voltage test method based on non-full compensation comprises the following steps:
step 1, establishing a non-full-compensation-based power frequency parallel resonance voltage-withstanding test model; as shown in fig. 1, the voltage withstand test model includes a power frequency test power supply, a power frequency step-up transformer, a compensation reactor and a tested object, the power frequency test power supply is connected to the low-voltage end of the power frequency step-up transformer, and the tested object is connected to the high-voltage end of the power frequency step-up transformer after being connected with the compensation reactor in parallel.
Step 2, comparing the value I of the capacitive current flowing on the tested object in the voltage-withstanding test modelCAnd rated output current value I of high-voltage end of power frequency step-up transformer in voltage-withstanding test model2(ii) a If ICIs greater than I2And calculating the inductance L of the compensation reactors which need to be connected in parallel at two ends of the tested object during full compensationqConnecting a compensation reactor with inductance L in parallel at two ends of the tested object for compensation, and executing the step 3; if ICIs less than or equal to I2Then, a withstand voltage test was performed. The number of the compensation reactors is at least one, and the inductance of each compensation reactor is a constant value. The inductance of a single compensation reactor is 20H-200H. L and LqThe relationship is that the inductance of the two is close or L ═ LqL is the total inductance of a plurality of compensation reactors connected in series or in parallel, and the inductance of a single compensation reactor is set as L1I.e. L ═ β NL1Or
N is a natural number, beta is a series mutual inductance coefficient, so the total inductance L of the N compensation reactors and the inductance L when the complete compensation is needed in calculationqAre not necessarily equal to each other, and LqThe closer to each other, the easier it is to satisfy IGeneral assemblyIs less than or equal to I2The conditions of (1). Therefore, the present embodiment only needs to satisfy
Is less than or equal to I2Corresponding conditions of the pressure test can be achieved, and the requirement on accuracy is lowered. Mixing L with1The range of the L-shaped inductance is selected to be 20H-200H, so that the inductance of the compensating reactor is convenient to adjust in actual voltage withstanding detection, and when the inductance required by a tested product is large, a large L is adopted1Can reduce the number of compensation reactors used, and can be used as a tested productWhen the required inductance is small, a small L is adopted1The accuracy of the inductance of the compensation reactor can be improved. In step 2, the value of the capacitive current I flowing on the tested object in the pressure-resistant test modelCBy the formula IC＝ωCxU is calculated, wherein ω -2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article, and U is the test voltage applied to the test article. Inductance L of compensation reactor required in full compensationqAccording to the capacitance C of the tested objectxObtaining under power frequency; inductance LqBy the formula
Calculated, where ω ═ 2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article.
Step 3, after the compensation reactors are connected in parallel at the two ends of the tested object, calculating the total current I output by the high-voltage end of the power frequency boosting transformerGeneral assembly，IGeneral assemblyAccording to the formula
Obtaining and comparing the total current I output by the high-voltage end of the power frequency step-up transformerGeneral assemblyRated output current value I of high-voltage end of power frequency booster transformer2(ii) a If IGeneral assemblyIs greater than I2If yes, continuing to increase the parallel compensation reactor at the two ends of the tested object to change the value of L, and re-executing the step 3; if IGeneral assemblyIs less than or equal to I2Then, a withstand voltage test was performed.
In this embodiment, the capacitive current of the tested object is compensated by the compensation reactor connected in parallel with the tested object, so that the compensated total current does not exceed the rated current value of the high-voltage output end of the power frequency step-up transformer, that is, the compensated capacity of the tested object is within the range of the rated output capacity of the power frequency step-up transformer. Therefore, the capacitance-rise effect of the circuit after compensation is not obvious, and the voltage of the tested object can be measured on the low-voltage side measuring winding of the power-frequency boosting transformer without using a capacitance voltage divider on the high-voltage side.
The volume-rising effect is testedWhen the capacitive current on the product flows through the power frequency step-up transformer, voltage drop is generated on the leakage reactance of the power frequency step-up transformer, so that the phenomenon that the actual voltage on the tested product is higher than the power supply voltage converted according to the transformation ratio of the power frequency step-up transformer is caused. In brief, the larger the capacitive current flowing through the power frequency step-up transformer or the exciting transformer is, the more obvious the capacitive step-up effect is. Thus, both fig. 2 and 3 use a capacitive voltage divider to directly measure the test voltage on the test article. As mentioned above, most of the capacitive current is compensated by the inductive current, the capacitive lift effect caused by the compensated total current flowing through the main-frequency step-up transformer or the exciting transformer is greatly reduced or even negligible. This is why fig. 3 and 4, after compensation, do not require the use of a capacitive divider on the high side to measure the test voltage. After compensation, the capacitive current IC＝ωCxMost of the inductive current of the U compensated reactor is compensated, so that the current flowing through the high-voltage side of the power frequency boosting transformer is below the rated current of the U compensated reactor. Since the absolute value of the rated current of the high-voltage side of the power frequency step-up transformer is very small, such as 0.01A in embodiment 2, the capacitance rise effect caused by the power frequency step-up transformer is very small and can be ignored.
As shown in fig. 1, 2 and 3, in the present example, the capacitive current I of the test object is compared with the line-frequency withstand voltage test method and the variable-frequency series resonance withstand voltage test methodC＝ωCxThe U does not flow through the high-voltage side of the power-frequency boosting transformer or the exciting transformer, but most of the capacitive current is compensated by the inductive current of the compensation reactor branch, and only a very small part of the compensated current flows through the high-voltage side of the power-frequency boosting transformer. Therefore, the coil section of the high-low voltage winding of the power frequency boosting transformer used in the embodiment can be thinner than that of the high-low voltage winding, so that the size and the mass of the power frequency boosting test transformer are greatly reduced, and the field carrying is facilitated.
As shown in fig. 1 and fig. 4, compared to the parallel differential compensation power frequency withstand voltage test method, the present embodiment adopts incomplete compensation, that is, complete parallel resonance does not occur at power frequency. Formula obtained by non-fully compensated power frequency parallel resonance voltage withstand test model
It can be seen that the inductive current I in the formula is made by configuring the compensation reactor LLCounteracting a part of the capacitive current ICAfter compensation, only the total current I flowing through the high-voltage side of the power frequency step-up transformerGeneral assemblyRated current I smaller than high-voltage side of power frequency booster transformer2And (4) finishing. Thus, after incomplete compensation, there are two cases: first, inductive current ILGreater than the capacitive current ICThen total current
Will be perceptual; second, inductive current ILLess than the capacitive current ICThen total current
Will be capacitive. The scheme does not need to accurately compensate the capacitance of a tested object, so that equipment such as a compensating capacitor and the like can be saved, the parameter accuracy requirement of a compensating reactor can be greatly reduced, the parallel-connection differential compensation power frequency voltage withstand test method requires accurate compensation, the inductance of the reactor is accurate to 1mH, and the capacitance of the compensating capacitor is accurate to 1 pF; the embodiment only needs the inductance of the compensation reactor to be accurate to 100 mH. Compared with the method, the method has the advantages that the threshold is greatly reduced, and the whole device is simpler and more reliable.
Example 2
In order to verify the practicability and effectiveness of the power frequency parallel resonance voltage withstand test method based on non-full compensation, a corresponding circuit model is established. The specific circuit parameters are as follows: the test piece (30kV, capacitance 0.0222 muF), the line frequency step-up transformer (50kV, 0.01A, transformation ratio 250:1, high-voltage side coil resistance 23k omega, weight 25kg), and the reactor (40 kV, 1.5A, inductance 76H, resistance 400 omega, weight 38kg) were required to be subjected to AC withstand voltage test of 21.75kV and 5min in total in five sections.
The first step, calculating the value of the capacitive current flowing by the tested object when the power frequency alternating current is withstand voltage:
IC＝ωCxU＝2×π×50×0.0222×10-6×21.75×1030.1517A is far larger than the rated output current of 0.01A on the high-voltage side of the main-frequency step-up transformer, so that a parallel compensation reactor is needed for current compensation.
And secondly, calculating the inductance required by the tested product during full compensation under power frequency:
and thirdly, selecting all the five reactors through estimation according to the inductance calculated in the previous step. Because mutual inductance exists when the reactors are stacked, after estimation, three combinations meet compensation requirements, namely: stacking three sections, independently placing the other two sections, and connecting five sections in series to form a total inductor of 448.4H and a total resistor of 2k omega; the four reactors are respectively overlapped two by two and then connected with the other reactor in series, and the total inductance of the five reactors after being connected in series is 440.8H total resistance 2k omega; and thirdly, stacking three sections of reactors and the other two sections of reactors in series connection, wherein the total inductance of five sections of reactors in series connection is 478.8H total resistance 2k omega.
And fourthly, respectively calculating the total current in the circuit after the three combinations of parallel compensation.
①
②
③
Therefore, the total current compensated by the three combination modes is less than 0.01A, and the power frequency alternating current withstand voltage requirement is met. Wherein, the negative sign indicates that the compensated total current is inductive, and the positive sign indicates that the compensated total current is capacitive.
Through field actual measurement, when a test voltage of 21.75kV is applied to a tested product, the total current of the first combination is 0.004A, the total current of the second combination is 0.00614A, the total current of the third combination is 0.00754A, and the deviation between an actual measurement value and a calculated value is mainly caused by the resistance of a compensation reactor and the coil of a power frequency boosting transformer. If the AC withstand voltage time of the tested object is required to be longer, the scheme of the combination I is more suitable for the AC withstand voltage test for a long time because the total current after compensation is minimum.
The main point of the power frequency parallel resonance voltage withstand test method based on non-full compensation is that compensation reactors are connected in parallel at two ends of a tested product, so that the compensated capacity of the tested product is within the rated output capacity range of a power frequency step-up transformer, and a power frequency alternating current voltage withstand test can be completed. The method has the advantages of simple principle, convenient realization, high reliability of the test device, simplicity and portability.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The power frequency parallel resonance withstand voltage test method based on non-full compensation is characterized by comprising the following steps:
step 1, establishing a non-full-compensation-based power frequency parallel resonance voltage-withstanding test model;
step 2, comparing the value I of the capacitive current flowing on the tested object in the voltage-withstanding test modelCAnd rated output current value I of high-voltage end of power frequency step-up transformer in voltage-withstanding test model2(ii) a If ICIs greater than I2And calculating the inductance L of the compensation reactors which need to be connected in parallel at two ends of the tested object during full compensationqConnecting a compensation reactor with inductance L in parallel at two ends of the tested object for compensation, and executing the step 3; if ICIs less than or equal to I2Then, carrying out a pressure resistance test;
step 3, after the two ends of the tested product are connected with the compensating reactors in parallel, calculating the power frequency step-up voltage changeTotal current I output from high-voltage end of transformerGeneral assembly，IGeneral assemblyAccording to the formula
Obtaining and comparing the total current I output by the high-voltage end of the power frequency step-up transformerGeneral assemblyRated output current value I of high-voltage end of power frequency booster transformer2(ii) a If IGeneral assemblyIs greater than I2If yes, continuing to increase the parallel compensation reactor at the two ends of the tested object to change the value of L, and re-executing the step 3; if IGeneral assemblyIs less than or equal to I2Then, carrying out a pressure resistance test;
in the step 1, the voltage withstand test model comprises a power frequency test power supply, a power frequency step-up transformer, a compensation reactor and a tested object, wherein the power frequency test power supply is connected to the low-voltage end of the power frequency step-up transformer, and the tested object is connected with the compensation reactor in parallel and then connected to the high-voltage end of the power frequency step-up transformer.
2. The non-full-compensation-based power frequency parallel resonance voltage withstand test method according to claim 1, wherein in the step 2, the capacitive current value I flowing on the tested object in the voltage withstand test modelCBy the formula IC＝ωCxU is calculated, wherein ω -2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article, and U is the test voltage applied to the test article.
3. The power frequency parallel resonance withstand voltage test method based on non-full compensation according to claim 1, wherein in the step 2, the inductance L of the compensation reactor required for full compensationqAccording to the capacitance C of the tested objectxObtaining under power frequency; inductance LqBy the formula
Calculated, where ω ═ 2 π f is the angular frequency, f is the power frequency, CxIs the capacitance of the test article.
4. The power frequency parallel resonance withstand voltage test method based on non-full compensation according to claim 3, wherein the number of the compensation reactors is at least one, and the inductance of each compensation reactor is a constant value.
5. The power frequency parallel resonance withstand voltage test method based on non-full compensation according to claim 4, wherein the inductance of the compensation reactor is 20H-200H.
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