Test method and system for rail transit high-frequency overvoltage protection device

Abstract

According to the test method and device for the rail transit high-frequency overvoltage protection device provided by the invention, a set of protection device composed of an inductor and a capacitor is formed for testing, and the inductance value and the capacitance value are adjusted through main compensation, so that the protection device can meet specific overvoltage protection requirements; therefore, the influence of overvoltage on the rail transit voltage transformer is reduced, and the accuracy of the overvoltage protection suppression effect of the protection device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit overvoltage protection, and in particular to a test method and system for a rail transit high-frequency overvoltage protection device. Background Art

[0002] Overvoltage refers to the phenomenon in the power system that the RMS value of the voltage rises by more than 10% of the rated value at the power frequency and lasts for more than 1 minute. This phenomenon is usually caused by transient overvoltage generated at the moment of load switching.

[0003] The voltage transformer is an important device in the power system, used for the measurement, protection and control of load voltage, power and electric energy. It provides key data and information for the normal operation and fault handling of the system. In the traction substation system, transient phenomena of overvoltage and current surge occur from time to time, which will cause the winding of the voltage transformer to be affected by electromagnetic force, and then the ferromagnetic body of the voltage transformer will heat up. Under the combined action of electricity and heat, this overvoltage transient process may cause insulation breakdown at the high-voltage input end of the winding, and then cause breakdown, ablation or explosion of the internal insulation, resulting in the failure of the voltage transformer function. In severe cases, it may cause the burning of the high-voltage switch cabinet, the shutdown of main equipment such as transformers, and line pressure loss.

[0004] Studying the causes of overvoltages, predicting their magnitudes, and taking effective measures to limit these phenomena are crucial for insulation coordination of power systems. Summary of the invention

[0005] The present invention provides a test method and system for a rail transit high-frequency overvoltage protection device, which are used to reduce the influence of overvoltage on a rail transit voltage transformer and to improve the accuracy of the overvoltage protection suppression effect of the protection device.

[0006] In a first aspect, the present invention provides a test method for a rail transit high-frequency overvoltage protection device, comprising:

[0007] Step S1, determining the inductance and capacitance of the protection device based on the obtained applied voltage of the voltage generator;

[0008] Step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device;

[0009] Step S3, collecting the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions;

[0010] Step S4, judging whether the preset overvoltage protection suppression effect is met according to the voltage before the first device, the voltage before the first transformer, the first secondary side voltage, the voltage before the second device, the voltage before the second transformer and the second secondary side voltage; if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to the step S1.

[0011] Optionally, step S3 includes:

[0012] Applying a power frequency voltage to the voltage generator, collecting a first device front voltage of the protection device, a first transformer front voltage of the voltage transformer, and a first secondary side voltage under normal voltage conditions after applying the power frequency voltage;

[0013] The power frequency voltage and high-frequency overvoltage are applied to the voltage generator, and the second device front voltage of the protection device, the second transformer front voltage of the voltage transformer and the second secondary side voltage are collected under abnormal voltage conditions after the power frequency voltage and the high-frequency overvoltage are applied.

[0014] Optionally, step S4 includes:

[0015] Step S41, respectively recording the first device front voltage waveform, the first transformer front voltage waveform, the first secondary side voltage waveform, the second device front voltage waveform, the second transformer front voltage waveform and the second secondary side voltage waveform corresponding to the first device front voltage, the first transformer front voltage and the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage;

[0016] Step S42, performing fast Fourier transform analysis on the voltage waveform before the first device, the voltage waveform before the first transformer, the first secondary side voltage waveform, the voltage waveform before the second device, the voltage waveform before the second transformer, and the second secondary side voltage waveform, respectively, to obtain normal voltage amplitude-frequency characteristics and abnormal voltage amplitude-frequency characteristics of the voltage transformer under the normal voltage condition and the abnormal voltage condition, respectively;

[0017] Step S43, judging whether the preset overvoltage protection suppression effect is met according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic, if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to step S1.

[0018] Optionally, the preset overvoltage protection suppression effect includes: a preset fluctuation amplitude suppression percentage, a preset wavefront time suppression percentage and a preset half-peak time suppression percentage; the step S43 includes:

[0019] Determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic;

[0020] Determine whether the actual fluctuation amplitude suppression percentage is greater than or equal to the preset fluctuation amplitude suppression percentage, whether the actual wavefront time suppression percentage is greater than or equal to the preset wavefront time suppression percentage, and whether the actual half-peak time suppression percentage is greater than or equal to the preset half-peak time suppression percentage; if so, define the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminate the current inductance value and the current capacitance value, and return to step S1.

[0021] Optionally, determining an actual fluctuation amplitude suppression percentage, an actual wavefront time suppression percentage, and an actual half-peak time suppression percentage according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic includes:

[0022] Based on the normal voltage amplitude-frequency characteristic, calculate the normal fluctuation amplitude, normal wavefront time and normal half-peak time when the voltage fluctuates under the normal voltage working condition;

[0023] Based on the abnormal voltage amplitude-frequency characteristic, calculating the abnormal fluctuation amplitude, abnormal wavefront time and abnormal half-peak time when the voltage fluctuates under the abnormal voltage working condition;

[0024] The normal fluctuation amplitude is compared with the abnormal fluctuation amplitude, the normal wavefront time is compared with the abnormal wavefront time, and the normal half-peak time is compared with the abnormal half-peak time to determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage.

[0025] Optionally, the step S1 includes:

[0026] Determining a corresponding impedance requirement according to an applied voltage of the voltage generator;

[0027] The inductance value and the capacitance value that meet the impedance requirement are determined through circuit analysis.

[0028] In a second aspect, the present invention provides a test system for a rail transit high-frequency overvoltage protection device, comprising:

[0029] A test value acquisition module, used to determine the inductance value and the capacitance value of the protection device based on the acquired applied voltage of the voltage generator;

[0030] A connection module, used to electrically connect the voltage generator in series with the voltage transformer through the protection device;

[0031] A collection module, used for collecting the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions;

[0032] A judgment module determines whether a preset overvoltage protection suppression effect is met according to the first device front voltage, the first transformer front voltage, the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage; if so, the current inductance value and the current capacitance value are defined as the target inductance value and the target capacitance value respectively; if not, the current inductance value and the current capacitance value are discarded, and the test value acquisition module is returned.

[0033] In a third aspect, the present invention provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect are performed.

[0034] In a fourth aspect, the present invention provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, runs the steps of the method provided in the first aspect.

[0035] In a fifth aspect, the present invention provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0036] It can be seen from the above technical solutions that the present invention has the following advantages:

[0037] The present invention provides a test method and system for a rail transit high-frequency overvoltage protection device, the method comprising: step S1, determining the inductance value and capacitance value of the protection device based on the obtained applied voltage of the voltage generator; step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device; step S3, collecting the first device pre-voltage of the protection device, the first transformer pre-voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device pre-voltage of the protection device, the second transformer pre-voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions; step S4, judging whether a preset overvoltage protection suppression effect is met according to the first device pre-voltage, the first transformer pre-voltage, the first secondary side voltage, the second device pre-voltage, the second transformer pre-voltage and the second secondary side voltage, and if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminating the current inductance value and the current capacitance value and returning to step S1. A set of tests is formed for protection devices composed of inductors and capacitors. By adjusting the inductance and capacitance values ​​through the main compensation, the protection device can meet specific overvoltage protection requirements, thereby reducing the impact of overvoltage on rail transit voltage transformers and improving the accuracy of the overvoltage protection suppression effect of the protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 This is a flow chart of a first embodiment of a test method for a rail transit high-frequency overvoltage protection device of the present invention;

[0040] Figure 2 This is a flow chart of a second embodiment of a test method for a rail transit high-frequency overvoltage protection device of the present invention;

[0041] Figure 3 The present invention is a structural block diagram of a test system embodiment of a rail transit high-frequency overvoltage protection device of the present invention. DETAILED DESCRIPTION

[0042] The embodiments of the present invention provide a test method and system for a rail transit high-frequency overvoltage protection device, which are used to reduce the influence of overvoltage on a rail transit voltage transformer and improve the accuracy of the overvoltage protection suppression effect of the protection device.

[0043] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Embodiment 1

[0045] See also Figure 1 , Figure 1 This is a flow chart of a first embodiment of a test method for a rail transit high-frequency overvoltage protection device of the present invention, the method comprising:

[0046] Step S1, determining the inductance and capacitance of the protection device based on the obtained applied voltage of the voltage generator;

[0047] In the embodiment of the present invention, the required inductance value and capacitance value are calculated according to the applied voltage of the voltage generator, and are used for the subsequent protection device test.

[0048] Step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device;

[0049] In the embodiment of the present invention, the output of the voltage generator is first connected to the protection device, and then the output of the protection device is connected to the voltage transformer. The connection process needs to ensure that all connections are firm and correct to avoid errors during the test process.

[0050] Step S3, collecting the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions;

[0051] In the embodiment of the present invention, under normal voltage conditions, the first device front voltage of the protection device, the first transformer front voltage of the voltage transformer, and the first secondary side voltage of the voltage transformer are recorded. Under abnormal voltage conditions, the second device front voltage of the protection device, the second transformer front voltage of the voltage transformer, and the second secondary side voltage of the voltage transformer are recorded.

[0052] Step S4, judging whether the preset overvoltage protection suppression effect is met according to the voltage before the first device, the voltage before the first transformer, the first secondary side voltage, the voltage before the second device, the voltage before the second transformer and the second secondary side voltage; if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to the step S1.

[0053] In this embodiment of the present invention, step S4 includes:

[0054] Step S41, respectively recording the first device front voltage waveform, the first transformer front voltage waveform, the first secondary side voltage waveform, the second device front voltage waveform, the second transformer front voltage waveform and the second secondary side voltage waveform corresponding to the first device front voltage, the first transformer front voltage and the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage;

[0055] Step S42, performing fast Fourier transform analysis on the voltage waveform before the first device, the voltage waveform before the first transformer, the first secondary side voltage waveform, the voltage waveform before the second device, the voltage waveform before the second transformer, and the second secondary side voltage waveform, respectively, to obtain normal voltage amplitude-frequency characteristics and abnormal voltage amplitude-frequency characteristics of the voltage transformer under the normal voltage condition and the abnormal voltage condition, respectively;

[0056] Step S43, judging whether the preset overvoltage protection suppression effect is met according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic, if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to step S1.

[0057] In a specific implementation, the preset overvoltage protection suppression effect includes: a preset fluctuation amplitude suppression percentage, a preset wavefront time suppression percentage, and a preset half-peak time suppression percentage; the step S43 includes:

[0058] Determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic;

[0059] Determine whether the actual fluctuation amplitude suppression percentage is greater than or equal to the preset fluctuation amplitude suppression percentage, whether the actual wavefront time suppression percentage is greater than or equal to the preset wavefront time suppression percentage, and whether the actual half-peak time suppression percentage is greater than or equal to the preset half-peak time suppression percentage; if so, define the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminate the current inductance value and the current capacitance value, and return to step S1.

[0060] A test method for a rail transit high-frequency overvoltage protection device provided in an embodiment of the present invention includes: step S1, determining the inductance and capacitance of the protection device based on the obtained applied voltage of the voltage generator; step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device; step S3, collecting the first device pre-voltage of the protection device, the first transformer pre-voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device pre-voltage of the protection device, the second transformer pre-voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions; step S4, judging whether the preset overvoltage protection suppression effect is met according to the first device pre-voltage, the first transformer pre-voltage, the first secondary side voltage, the second device pre-voltage, the second transformer pre-voltage and the second secondary side voltage, and if so, defining the current inductance and the current capacitance as the target inductance and the target capacitance respectively; if not, removing the current inductance and the current capacitance, and returning to step S1. A set of tests is formed for protection devices composed of inductors and capacitors. By adjusting the inductance and capacitance values ​​through the main compensation, the protection device can meet specific overvoltage protection requirements, thereby reducing the impact of overvoltage on rail transit voltage transformers and improving the accuracy of the overvoltage protection suppression effect of the protection device.

[0061] Embodiment 2

[0062] See also Figure 2 , Figure 2 This is a flow chart of a second embodiment of a test method for a rail transit high-frequency overvoltage protection device of the present invention, the steps comprising:

[0063] S201, determining an inductance value and a capacitance value of a protection device based on the acquired applied voltage of the voltage generator;

[0064] In an embodiment of the present invention, the process of determining the inductance value and the capacitance value of the protection device includes: determining the corresponding impedance requirement according to the applied voltage of the voltage generator; and determining the inductance value and the capacitance value that meet the impedance requirement through circuit analysis.

[0065] In the specific implementation, the impedance requirement of the protection device is;

[0066] Under 500 kHz operating conditions, the impedance of the protection device is greater than or equal to 400 ohms;

[0067] Under 1 MHz operating conditions, the impedance of the protection device is greater than or equal to 350 ohms;

[0068] Under 5 MHz operating conditions, the impedance of the protection device is greater than or equal to 250 ohms;

[0069] Under 10 MHz operating conditions, the impedance of the protection device is greater than or equal to 150 ohms.

[0070] S202, electrically connecting the voltage generator in series with the voltage transformer through the protection device;

[0071] In the embodiment of the present invention, the voltage transformer may be a voltage transformer with a grounded housing or a fully insulated voltage transformer.

[0072] S203, collecting a first device front voltage of the protection device, a first transformer front voltage of the voltage transformer and a first secondary side voltage under normal voltage conditions, and a second device front voltage of the protection device, a second transformer front voltage of the voltage transformer and a second secondary side voltage under abnormal voltage conditions;

[0073] It should be noted that high-frequency overvoltage is divided into lightning impulse voltage and switching impulse voltage. The parameters of lightning impulse voltage and switching impulse voltage generated by the voltage generator should not be lower than the parameters of standard lightning impulse voltage and standard switching impulse voltage.

[0074] Among them, the standard lightning impulse voltage parameters are full-wave apparent wavefront time equal to 1.2 microseconds, apparent half-peak time equal to 50 microseconds, and an amplitude of 38.89 kilovolts; the standard operating impulse voltage wave parameters are wavefront time equal to 250 microseconds, half-peak time equal to 2500 microseconds, and an amplitude of 10 kilovolts.

[0075] In an embodiment of the present invention, an industrial frequency voltage is applied to the voltage generator, and the first device pre-voltage of the protection device, the first transformer pre-voltage of the voltage transformer and the first secondary side voltage are collected under normal voltage conditions after the industrial frequency voltage is applied; the industrial frequency voltage and high-frequency overvoltage are applied to the voltage generator, and the second device pre-voltage of the protection device, the second transformer pre-voltage of the voltage transformer and the second secondary side voltage are collected under abnormal voltage conditions after the industrial frequency voltage and the high-frequency overvoltage are applied.

[0076] S204, respectively recording the first device front voltage waveform, the first transformer front voltage waveform, the first secondary side voltage waveform, the second device front voltage waveform, the second transformer front voltage waveform, and the second secondary side voltage waveform corresponding to the first device front voltage, the first transformer front voltage and the first secondary side voltage, the second device front voltage, the second transformer front voltage, and the second secondary side voltage;

[0077] In an embodiment of the present invention, in an embodiment of the present invention, after completing the first device front voltage, the first transformer front voltage and the first secondary side voltage under normal voltage conditions, the voltage generator stops applying voltage, and then applies power frequency voltage and high-frequency overvoltage to form an abnormal voltage condition, and collects the second device front voltage, the second transformer front voltage and the second secondary side voltage under the abnormal voltage condition.

[0078] S205, performing fast Fourier transform analysis on the voltage waveform before the first device, the voltage waveform before the first transformer, the first secondary side voltage waveform, the voltage waveform before the second device, the voltage waveform before the second transformer, and the second secondary side voltage waveform, respectively, to obtain normal voltage amplitude-frequency characteristics and abnormal voltage amplitude-frequency characteristics of the voltage transformer under the normal voltage condition and the abnormal voltage condition, respectively;

[0079] In the embodiment of the present invention, all voltage waveforms are converted from the time domain to the frequency domain by performing fast Fourier transform analysis on all voltage waveforms, thereby more efficiently analyzing the amplitude-frequency characteristics of the voltage.

[0080] S206, calculating, based on the normal voltage amplitude-frequency characteristic, a normal fluctuation amplitude, a normal wavefront time, and a normal half-peak time when the voltage fluctuates under the normal voltage operating condition;

[0081] S207, calculating the abnormal fluctuation amplitude, abnormal wavefront time and abnormal half-peak time of voltage fluctuation under the abnormal voltage condition based on the abnormal voltage amplitude-frequency characteristic;

[0082] S208, sequentially comparing the normal fluctuation amplitude with the abnormal fluctuation amplitude, the normal wavefront time with the abnormal wavefront time, and the normal half-peak time with the abnormal half-peak time, to determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage;

[0083] S209, determine whether the actual fluctuation amplitude suppression percentage is greater than or equal to the preset fluctuation amplitude suppression percentage, whether the actual wavefront time suppression percentage is greater than or equal to the preset wavefront time suppression percentage, and whether the actual half-peak time suppression percentage is greater than or equal to the preset half-peak time suppression percentage; if so, define the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminate the current inductance value and the current capacitance value, and return to the step S201.

[0084] In the embodiment of the present invention, the preset fluctuation amplitude suppression percentage is 7%, and the preset wavefront time suppression percentage and the preset half-peak time suppression percentage are 5%.

[0085] A test method for a rail transit high-frequency overvoltage protection device disclosed in an embodiment of the present invention includes: step S1, determining the inductance value and capacitance value of the protection device based on the obtained applied voltage of the voltage generator; step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device; step S3, collecting the first device pre-voltage of the protection device, the first transformer pre-voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device pre-voltage of the protection device, the second transformer pre-voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions; step S4, judging whether the preset overvoltage protection suppression effect is met according to the first device pre-voltage, the first transformer pre-voltage, the first secondary side voltage, the second device pre-voltage, the second transformer pre-voltage and the second secondary side voltage, and if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminating the current inductance value and the current capacitance value and returning to step S1. By obtaining the inductance and capacitance values ​​of the protection device that meets the specific impedance requirements, recording and analyzing the voltage waveforms under normal and abnormal voltage conditions, performing fast Fourier transform to obtain the amplitude-frequency characteristics, and calculating the suppression percentage of the fluctuation amplitude, wavefront time and half-peak time, and finally comparing with the preset suppression effect to evaluate and adjust the inductance and capacitance values. A set of tests is formed for protection devices composed of inductors and capacitors. By adjusting the inductance and capacitance values ​​through the main compensation, the protection device can meet the specific overvoltage protection requirements, thereby reducing the impact of overvoltage on rail transit voltage transformers and improving the accuracy of the overvoltage protection suppression effect of the protection device.

[0086] Embodiment 3

[0087] See also Figure 3 , Figure 3 This is a structural block diagram of an embodiment of a test system of a rail transit high-frequency overvoltage protection device of the present invention, and the device includes:

[0088] A test value acquisition module 301 is used to determine the inductance value and the capacitance value of the protection device based on the acquired applied voltage of the voltage generator;

[0089] A connection module 302, used to electrically connect the voltage generator in series with the voltage transformer through the protection device;

[0090] The acquisition module 303 is used to acquire the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions;

[0091] The judgment module 304 judges whether the preset overvoltage protection suppression effect is met according to the first device front voltage, the first transformer front voltage, the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage. If so, the current inductance value and the current capacitance value are defined as the target inductance value and the target capacitance value respectively; if not, the current inductance value and the current capacitance value are discarded and the test value acquisition module is returned.

[0092] In an optional embodiment, the acquisition module 303 includes:

[0093] A first acquisition submodule is used for applying a power frequency voltage to the voltage generator, and collecting a first pre-device voltage of the protection device, a first pre-transformer voltage of the voltage transformer, and a first secondary side voltage under normal voltage conditions after the power frequency voltage is applied;

[0094] The second acquisition submodule is used for the voltage generator to apply the power frequency voltage and the high-frequency overvoltage, and to collect the second device front voltage of the protection device, the second transformer front voltage of the voltage transformer and the second secondary side voltage under abnormal voltage conditions after the power frequency voltage and the high-frequency overvoltage are applied.

[0095] In an optional embodiment, the determining module 304 includes:

[0096] a waveform recording submodule, for recording the first device front voltage waveform, the first transformer front voltage waveform, the first secondary side voltage waveform, the second device front voltage waveform, the second transformer front voltage waveform and the second secondary side voltage waveform corresponding to the first device front voltage, the first transformer front voltage and the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage respectively;

[0097] An analysis submodule, for performing fast Fourier transform analysis on the voltage waveform before the first device, the voltage waveform before the first transformer, the first secondary side voltage waveform, the voltage waveform before the second device, the voltage waveform before the second transformer, and the second secondary side voltage waveform, respectively, to obtain normal voltage amplitude-frequency characteristics and abnormal voltage amplitude-frequency characteristics of the voltage transformer under the normal voltage condition and the abnormal voltage condition, respectively;

[0098] The judgment submodule is used to judge whether the preset overvoltage protection suppression effect is met according to the normal voltage amplitude-frequency characteristics and the abnormal voltage amplitude-frequency characteristics. If so, the current inductance value and the current capacitance value are defined as the target inductance value and the target capacitance value respectively; if not, the current inductance value and the current capacitance value are discarded and the test value acquisition module 301 is returned.

[0099] In an optional embodiment, the preset overvoltage protection suppression effect includes: a preset fluctuation amplitude suppression percentage, a preset wavefront time suppression percentage and a preset half-peak time suppression percentage; the judgment submodule includes:

[0100] A suppression percentage determination unit, used to determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic;

[0101] A judgment unit is used to judge whether the actual fluctuation amplitude suppression percentage is greater than or equal to the preset fluctuation amplitude suppression percentage, whether the actual wavefront time suppression percentage is greater than or equal to the preset wavefront time suppression percentage, and whether the actual half-peak time suppression percentage is greater than or equal to the preset half-peak time suppression percentage; if so, the current inductance value and the current capacitance value are defined as the target inductance value and the target capacitance value respectively; if not, the current inductance value and the current capacitance value are eliminated, and the test value acquisition module 301 is returned.

[0102] In an optional embodiment, the suppression percentage determination unit includes:

[0103] A first calculation subunit is used to calculate the normal fluctuation amplitude, normal wavefront time and normal half-peak time of voltage fluctuation under the normal voltage working condition based on the normal voltage amplitude-frequency characteristic;

[0104] A second calculation subunit is used to calculate the abnormal fluctuation amplitude, abnormal wavefront time, and abnormal half-peak time of voltage fluctuation under the abnormal voltage working condition based on the abnormal voltage amplitude-frequency characteristic;

[0105] The comparison subunit is used to compare the normal fluctuation amplitude with the abnormal fluctuation amplitude, the normal wavefront time with the abnormal wavefront time, and the normal half-peak time with the abnormal half-peak time in sequence to determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage.

[0106] In an optional embodiment, the test value acquisition module 301 includes:

[0107] An impedance requirement determination submodule, used to determine a corresponding impedance requirement according to an applied voltage of the voltage generator;

[0108] The circuit analysis submodule is used to determine the inductance value and the capacitance value that meet the impedance requirement through circuit analysis.

[0109] Embodiment 4

[0110] An embodiment of the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of a test method for a rail transit high-frequency overvoltage protection device in any embodiment.

[0111] Embodiment 5

[0112] An embodiment of the present invention further provides a computer storage medium having a computer program stored thereon, and when the computer program is executed by the processor, the steps of a test method of a rail transit high-frequency overvoltage protection device of any embodiment are implemented.

[0113] Embodiment 6

[0114] An embodiment of the present invention further provides a computer program product having a computer program stored thereon, and when the computer program is executed by the processor, the steps of a test method of a rail transit high-frequency overvoltage protection device in any embodiment are implemented.

[0115] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0116] In the several embodiments provided in the present application, it should be understood that the methods, devices, electronic devices and storage media disclosed in the present invention can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0117] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0118] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0119] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0120] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test method for a rail transit high-frequency overvoltage protection device, characterized in that: include: Step S1, determining the inductance and capacitance of the protection device based on the obtained applied voltage of the voltage generator; Step S2, electrically connecting the voltage generator in series with the voltage transformer through the protection device; Step S3, collecting the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions; Step S4, judging whether the preset overvoltage protection suppression effect is met according to the voltage before the first device, the voltage before the first transformer, the first secondary side voltage, the voltage before the second device, the voltage before the second transformer and the second secondary side voltage; if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to the step S1.

2. The test method of the rail transit high-frequency overvoltage protection device according to claim 1 is characterized in that: The step S3 comprises: Applying a power frequency voltage to the voltage generator, collecting a first device front voltage of the protection device, a first transformer front voltage of the voltage transformer, and a first secondary side voltage under normal voltage conditions after applying the power frequency voltage; The power frequency voltage and high-frequency overvoltage are applied to the voltage generator, and the second device front voltage of the protection device, the second transformer front voltage of the voltage transformer and the second secondary side voltage are collected under abnormal voltage conditions after the power frequency voltage and the high-frequency overvoltage are applied.

3. The test method of the rail transit high-frequency overvoltage protection device according to claim 1 is characterized in that: The step S4 comprises: Step S41, respectively recording the first device front voltage waveform, the first transformer front voltage waveform, the first secondary side voltage waveform, the second device front voltage waveform, the second transformer front voltage waveform and the second secondary side voltage waveform corresponding to the first device front voltage, the first transformer front voltage and the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage; Step S42, performing fast Fourier transform analysis on the voltage waveform before the first device, the voltage waveform before the first transformer, the first secondary side voltage waveform, the voltage waveform before the second device, the voltage waveform before the second transformer, and the second secondary side voltage waveform, respectively, to obtain normal voltage amplitude-frequency characteristics and abnormal voltage amplitude-frequency characteristics of the voltage transformer under the normal voltage condition and the abnormal voltage condition, respectively; Step S43, judging whether the preset overvoltage protection suppression effect is met according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic, if so, defining the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, discarding the current inductance value and the current capacitance value and returning to step S1.

4. The test method of the rail transit high-frequency overvoltage protection device according to claim 3 is characterized in that: The preset overvoltage protection suppression effect includes: a preset fluctuation amplitude suppression percentage, a preset wavefront time suppression percentage and a preset half-peak time suppression percentage; the step S43 includes: Determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage according to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic; Determine whether the actual fluctuation amplitude suppression percentage is greater than or equal to the preset fluctuation amplitude suppression percentage, whether the actual wavefront time suppression percentage is greater than or equal to the preset wavefront time suppression percentage, and whether the actual half-peak time suppression percentage is greater than or equal to the preset half-peak time suppression percentage; if so, define the current inductance value and the current capacitance value as the target inductance value and the target capacitance value respectively; if not, eliminate the current inductance value and the current capacitance value, and return to step S1.

5. The test method of the rail transit high-frequency overvoltage protection device according to claim 4 is characterized in that: According to the normal voltage amplitude-frequency characteristic and the abnormal voltage amplitude-frequency characteristic, determining the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage, including: Based on the normal voltage amplitude-frequency characteristic, calculate the normal fluctuation amplitude, normal wavefront time and normal half-peak time when the voltage fluctuates under the normal voltage working condition; Based on the abnormal voltage amplitude-frequency characteristic, calculating the abnormal fluctuation amplitude, abnormal wavefront time and abnormal half-peak time when the voltage fluctuates under the abnormal voltage working condition; The normal fluctuation amplitude is compared with the abnormal fluctuation amplitude, the normal wavefront time is compared with the abnormal wavefront time, and the normal half-peak time is compared with the abnormal half-peak time to determine the actual fluctuation amplitude suppression percentage, the actual wavefront time suppression percentage, and the actual half-peak time suppression percentage.

6. The test method of the rail transit high-frequency overvoltage protection device according to claim 3 is characterized in that: The step S1 comprises: Determining a corresponding impedance requirement according to an applied voltage of the voltage generator; The inductance value and the capacitance value that meet the impedance requirement are determined through circuit analysis.

7. A test system for a rail transit high-frequency overvoltage protection device, characterized in that: include: A test value acquisition module, used to determine the inductance value and the capacitance value of the protection device based on the acquired applied voltage of the voltage generator; A connection module, used to electrically connect the voltage generator in series with the voltage transformer through the protection device; A collection module, used for collecting the first device front voltage of the protection device, the first transformer front voltage and the first secondary side voltage of the voltage transformer under normal voltage conditions, and the second device front voltage of the protection device, the second transformer front voltage and the second secondary side voltage of the voltage transformer under abnormal voltage conditions; A judgment module determines whether a preset overvoltage protection suppression effect is met according to the first device front voltage, the first transformer front voltage, the first secondary side voltage, the second device front voltage, the second transformer front voltage and the second secondary side voltage; if so, the current inductance value and the current capacitance value are defined as the target inductance value and the target capacitance value respectively; if not, the current inductance value and the current capacitance value are discarded, and the test value acquisition module is returned.

8. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 6 is executed.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is executed.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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