Portable universal AC partial discharge pulse group generation system and equipment detection method thereof

Abstract

The present invention discloses a portable universal AC partial discharge pulse group generating system and its equipment detection method, which belongs to the field of AC partial discharge test technology, and solves the problem of lack of portable and universal AC partial discharge pulse group generating system and matching equipment detection method in the prior art. The system includes a data processor, a current pulse-phase sequence generator and a transmitter; wherein the data processor is used to draw and load a reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type; the current pulse-phase sequence generator is used to receive and process the reference AC PRPD spectrum to generate a corresponding transient current pulse group; the transmitter is used to form a transient physical field simulating a PD source in the housing and inside of the device under test based on the transient current pulse group.

Description

Technical Field

[0001] The invention relates to the technical field of AC partial discharge testing, and in particular to a portable universal AC partial discharge pulse group generating system and an equipment detection method thereof. Background Art

[0002] The operation and maintenance analysis of 110kV and above transformers, GIS, switchgear and other equipment owned by power grid companies shows that insulation defects / faults caused, aggravated and evolved by partial discharge (PD) account for about 40%, making PD detection the most core means of controlling the quality and operating status of such main equipment throughout its life cycle.

[0003] The PD source inside the equipment continuously generates a single ns-level rising edge current pulse, accompanied by sound and light signals, and radiates electromagnetic waves, making the ultrasonic (AE) method, transient earth electric wave (TEV) method and electromagnetic wave high frequency (UHF) method the most common and widely used PD detection technical means, which can be used for daily live detection and real-time online monitoring of equipment such as transformers, GIS and switch cabinets. These instruments and systems used for PD live detection and online monitoring are delivered to users after type tests and factory tests required by relevant standards.

[0004] However, for users such as power supply companies, there is no technical means to judge and evaluate whether the instruments used and the online monitoring systems that have been put into operation can work normally and meet the requirements of PD detection. The commonly used judgment method is to entrust a professional organization to set defects (tips, air gaps, suspensions, etc.) in the laboratory real equipment, and conduct high-voltage tests to cause the defects to discharge stably, so as to simulate the PD source formed by insulation defects, to determine whether the three types of instruments or systems of AE, TEV and UHF methods can work normally, and to determine whether the test results given by the tested equipment are consistent with the set defect type. This working mode is time-consuming and laborious to carry out. Users such as power supply companies need to transport the equipment to professional institutions, and it cannot be performed for online monitoring systems that have been installed on site.

[0005] Therefore, how to design a portable and universal AC partial discharge pulse group generation system and realize equipment detection based on it is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of the above analysis, an embodiment of the present invention aims to provide a portable universal AC partial discharge pulse group generating system and a device detection method thereof, so as to solve the problem of lack of portable and universal AC partial discharge pulse group generating system and a matching device detection method in the prior art.

[0007] On the one hand, the present invention provides a portable universal AC partial discharge pulse group generating system, the system comprising a data processor, a current pulse-phase sequence generator and a transmitter; wherein,

[0008] The data processor is used to draw and load a reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type;

[0009] The current pulse-phase sequence generator is used to receive and process the reference AC PRPD spectrum to generate a corresponding transient current pulse group;

[0010] The transmitter is used to form a transient physical field simulating a PD source in the casing and inside of the AC electrical equipment based on the transient current pulse group.

[0011] On the basis of the above scheme, the present invention also makes the following improvements:

[0012] Furthermore, the system also includes a mobile terminal; wherein,

[0013] The mobile terminal is used to pre-store AC PRPD data files corresponding to various artificial defect discharge types; it is also used to select the AC PRPD data file of the corresponding artificial defect discharge type according to the artificial defect discharge type tested by the AC electrical equipment, and transmit it to the data processor.

[0014] Further, the sensors built into the transmitter include AE ​​sensors, TEV sensors and embedded UHF sensors;

[0015] A PD detection mode is determined according to the artificial defect discharge type, and a sensor matching the PD detection mode is selected from the transmitter.

[0016] Furthermore, the system also includes a power module, an input and display module and a communication module; wherein,

[0017] The power module, input and display module, data processor, current pulse-phase sequence generator and communication module form a portable integrated device.

[0018] Furthermore, the portable integrated device is connected to the transmitter via a coaxial cable and connected to the mobile terminal via a communication module.

[0019] Furthermore, the input and display module is used to obtain and display the status of the power module, the data processor, the current pulse-phase sequence generator and the communication module; and is also used to provide a human-computer interaction interface so that the user can set the status of the portable integrated device.

[0020] Further, in the current pulse-phase sequence generator, the reference AC PRPD spectrum is processed to generate a corresponding transient current pulse group, and the following steps are performed:

[0021] The reference AC PRPD spectrum is processed to generate corresponding peak-phase distribution characteristics, and all single transient current pulses that meet the peak corresponding rising edge time of less than 10 ns, half-peak width time of less than 50 ns, and duration of less than 100 ns are selected to form a transient current pulse group.

[0022] Furthermore, the rising edge time , half peak width time , Peak duration Respectively expressed as:

[0023] (1)

[0024] (2)

[0025] (3)

[0026] in, , They represent the time corresponding to 10% and 90% of the rising edge of the transient current pulse respectively; express The second moment corresponding to the Indicates the peak value of the transient current pulse; Indicates the time corresponding to the apparent zero point of the transient current pulse.

[0027] On the other hand, the present invention also provides a device detection method based on the portable universal AC partial discharge pulse group generating system, the device detection method comprising the following steps:

[0028] Set the AC electrical equipment and the type of artificial defect discharge to be tested; take the PD detection instrument or online monitoring system as the device to be tested, and select the sensor in the transmitter according to the device to be tested;

[0029] The data processor draws and loads the reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type, and generates the corresponding transient current pulse group by the current pulse-phase sequence generator and outputs it to the transmitter;

[0030] The transmitter forms a transient physical field simulating a PD source in and inside the housing of the AC electrical equipment based on the received transient current pulse group;

[0031] The device under test detects the transient physical field of the simulated PD source, records the test AC PRPD spectrum, and obtains the defect type identification result of the test AC PRPD spectrum; determines whether the defect type identification result of the test AC PRPD spectrum is consistent with the given artificial defect discharge type. If they are consistent, it indicates that the device under test is working normally; otherwise, the device under test is working abnormally.

[0032] On the basis of the above solution, the present invention also makes the following improvements: the device detection method further includes the following steps:

[0033] After selecting the sensor in the transmitter, first use the mobile terminal to send the AC PRPD data file of the current artificial defect discharge type to the data processor.

[0034] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0035] The portable universal AC partial discharge pulse group generation system provided by the present invention is based on a data processor, a current pulse-phase sequence generator and a transmitter. By loading a reference AC PRPD spectrum, a transient current pulse group is generated, and a transient physical field simulating a PD source is formed in the shell and inside of the AC electrical equipment accordingly, so as to realize PD detection in different ways. It has portability and versatility, and well solves the problem of the lack of portable and universal AC partial discharge pulse group generation systems in the prior art. At the same time, the system adopts a portable, integrated device with a visual input window, and the signal injection of the transient current pulse group can be equipped with a transmitter, which can well adapt to different working scenes and meet on-site needs.

[0036] In addition, the present invention takes into account the fact that power supply companies lack the technical means to judge and evaluate whether the three types of PD instruments, including AE, TEV and UHF methods, and the online monitoring systems that have been put into operation can work normally and meet the requirements of PD detection. It also provides an equipment detection method based on a portable universal AC partial discharge pulse group generation system. Since the amplitude intensity of the generated single transient current pulse is adjustable, the signal generated by the PD source can be truly simulated in the time domain and frequency domain, and the phase distribution characteristics are also consistent with the real PD source. Therefore, it can achieve accurate detection of the equipment under test and has a good application prospect.

[0037] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components;

[0039] Figure 1 A schematic structural diagram of a portable universal AC partial discharge pulse group generating system provided in Example 1 of the present invention;

[0040] Figure 2 A schematic diagram of a single transient current pulse provided in Example 1 of the present invention;

[0041] Figure 3 A schematic structural diagram of another portable universal AC partial discharge pulse group generating system provided in Example 1 of the present invention;

[0042] Figure 4 A flow chart of a device detection method based on a portable universal AC partial discharge pulse group generating system provided in Example 2 of the present invention;

[0043] Figure 5 A schematic diagram of the connection relationship of a switch cabinet AE / TEV live detection instrument provided in Example 2 of the present invention;

[0044] Figure 6 A schematic diagram of the connection relationship of a UHF online monitoring system for a transformer provided in Example 2 of the present invention;

[0045] Figure 7 An example of an AE AC PRPD spectrum corresponding to a GIS artificial defect (tip) provided in Example 2 of the present invention;

[0046] Figure 8 An example of an AE AC PRPD spectrum corresponding to a GIS artificial defect (air gap) provided in Example 2 of the present invention;

[0047] Fig. 9 This is an example of an AE AC PRPD spectrum corresponding to a GIS artificial defect (suspension) provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0049] Specific embodiment 1 of the present invention discloses a portable universal AC partial discharge pulse group generating system, the structural schematic diagram of which is shown in FIG. Figure 1As shown. The system includes a data processor, a current pulse-phase sequence generator and a transmitter; wherein the data processor is used to draw and load a reference AC PRPD spectrum according to the AC PRPD (Phase Resolved Partial Discharge, partial discharge phase) data file of the current artificial defect discharge type; the current pulse-phase sequence generator is used to receive and process the reference AC PRPD spectrum to generate a corresponding transient current pulse group; the transmitter is used to form a transient physical field simulating a PD source in the shell and inside of the AC electrical equipment based on the transient current pulse group.

[0050] Preferably, the system also includes a mobile terminal; wherein the mobile terminal is used to pre-store AC PRPD data files corresponding to various artificial defect discharge types; and is also used to select the AC PRPD data files of the corresponding artificial defect discharge type according to the artificial defect discharge type tested by the AC electrical equipment, and transmit it to the data processor. It should be noted that the AC PRPD data files corresponding to the various artificial defect discharge types pre-stored in the mobile terminal are obtained by setting the artificial defect model of the corresponding artificial defect discharge type in the laboratory real equipment. Common artificial defect discharge types include tip, air gap and suspended discharge defects. In the specific implementation process, the AC PRPD data file can be expressed as a .txt file, and the data file includes: the reference time of the local discharge event and its corresponding amplitude under the corresponding artificial defect discharge type. Exemplarily, in the AC PRPD data file, in addition to the reference time and its corresponding amplitude, it can also include information such as signal gain, upper limit frequency, lower limit frequency, sampling frequency, sampling mode and peak count. Taking the "cutting edge.txt" file as an example, it can be expressed as: signal gain: 100 x; lower limit frequency: 20 kHz; upper limit frequency: 100 kHz; sampling frequency: 1 MS / s; sampling mode: pulse; peak count: 2000; and several groups of reference time and their corresponding amplitudes. To ensure accuracy, the unit of amplitude can be mV, and the unit of reference time can be μs.

[0051] The data processor can draw and load the reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type. In this field, the AC PRPD spectrum, that is, the peak-phase sequence, is a graphical tool for analyzing local discharge activities in high-voltage insulation systems. It provides an intuitive way to observe the distribution of discharge activities within the AC voltage cycle by linking the peak and phase of local discharge events. At the same time, in actual application, local discharge of equipment is mainly caused by defects inside or on the surface of the high-voltage insulation system, such as tips, air gaps and suspensions. Preferably, after acquiring the AC PRPD data file, the data processor performs coordinate conversion on each reference time in the AC PRPD data file according to a fixed period, converts it into a phase, and matches the phase and peak, thereby drawing a peak-phase sequence and loading it to form a reference AC PRPD spectrum.

[0052] In the current pulse-phase sequence generator, the reference AC PRPD spectrum is processed in the following manner to generate the corresponding transient current pulse group: the reference AC PRPD spectrum is processed to generate the corresponding peak-phase distribution characteristics, and all single transient current pulses that meet the peak corresponding rising edge time less than 10 ns, half-peak width time less than 50 ns, and duration less than 100 ns are selected to form a transient current pulse group.

[0053] If the peak-phase sequence has 100 different peaks, the pulse group to be processed consists of 100 transient current pulses with different phase information. The schematic diagram of a single transient current pulse is as follows: Figure 2 As shown. Rising edge time , half peak width time , Peak duration Respectively expressed as:

[0054] (1)

[0055] (2)

[0056] (3)

[0057] in, Indicates the peak value of the transient current pulse, express The second moment corresponding to (ns); represents the time corresponding to the apparent zero point of the transient current pulse (ns). According to the straight line equation formed by the 90% and 10% points at the rising edge in formula (4),

[0058] (4)

[0059] Available

[0060] (5)

[0061] in, Indicates time, Indicates peak value; Indicates the peak value of transient current pulse The corresponding second moment (ns). , They represent the amplitudes corresponding to 10% and 90% of the rising edge of the transient current pulse, , They respectively represent the time corresponding to 10% and 90% of the rising edge of the transient current pulse.

[0062] In this embodiment, the sensors built into the transmitter include AE / TEV sensors and embedded UHF sensors. Common PD detection methods include AE ​​method, TEV method and UHF method. In the specific implementation process, a matching sensor can be selected from the transmitter according to the PD detection method. That is, for different PD detection methods, corresponding PD detection instruments or online monitoring systems are provided, and the sensors used are also different.

[0063] Exemplarily, when the artificial defect discharge type is a tip discharge defect set inside the transformer, the selected PD detection method can be the UHF method, and the sensor selected from the transmitter is a pre-embedded UHF sensor. Exemplarily, the pre-embedded UHF sensor can use a UHF electric field antenna sensor. At this time, a UHF electric field antenna sensor is used to form a transient magnetic field generated by a simulated PD source in the casing and interior of the AC electrical equipment. Exemplarily, the UHF electric field antenna sensor can use a monopole, and the operating frequency band range is 300~3000 MHz.

[0064] Exemplarily, when the artificial defect discharge type is a suspended discharge defect set inside the GIS, the selected PD detection method can be the AE method, and the sensor selected from the transmitter is the AE sensor; Exemplarily, the AE sensor can be an AE ultrasonic sensor. At this time, the AE ultrasonic sensor forms a transient sound field generated by a simulated PD source in the casing and inside of the AC electrical equipment. Exemplarily, the AE ultrasonic sensor can use a PZT piezoelectric ceramic sensor with an operating frequency band range of 20~200 kHz.

[0065] Exemplarily, when the artificial defect discharge type is a surface discharge defect set inside the switch cabinet, the selected PD detection method can be the TEV method, and the sensor selected from the transmitter is the TEV sensor. Exemplarily, the TEV sensor uses a TEV electromagnetic wave sensor. At this time, the TEV electromagnetic wave sensor forms a transient magnetic field generated by a simulated PD source in the casing and inside of the AC electrical equipment. Exemplarily, the TEV electromagnetic wave sensor can use a capacitive coupling sensor with an operating frequency band range of 3~100MHz.

[0066] It should be noted that the AE / TEV sensor can integrate the AE sensor and the TEV sensor. Its advantages are: high detection accuracy, strong anti-interference ability, and the ability to achieve multi-signal comparison; its disadvantages are: insensitivity to low-frequency discharge, signal attenuation and refraction-reflection problems, and high cost. Therefore, in the specific implementation process, the AE sensor and the TEV sensor can be built into the transmitter according to the specific application scenario, or the AE / TEV sensor can be built into the transmitter.

[0067] In this embodiment, through the cooperation between the data processor, the current pulse-phase sequence generator and the transmitter, the portable universal AC partial discharge pulse group generation system can realize the basic function of forming a transient physical field of a simulated PD source in the shell and inside of the device under test, which can adapt to different types of artificial defect discharges, has universality, and the system structure is relatively simple and portable. In addition, in the case of adding a mobile terminal, AC PRPD data files of various types of artificial defect discharges can be pre-stored, which can meet the simulation requirements in more application scenarios and make the system more efficient.

[0068] In order to further optimize the function of the system, the system also includes a power module, an input and display module and a communication module. Among them, the power module, the input and display module, the data processor, the current pulse-phase sequence generator and the communication module constitute a portable integrated device; the portable integrated device is connected to the transmitter through a coaxial cable and connected to the mobile terminal through the communication module. At this time, the structural diagram of the portable universal AC partial discharge pulse group generation system is as follows Figure 3 It should be noted that in this system, the power module is indispensable, which is used to provide continuous power supply for the portable integrated device when it is working, and it can be charged through the commonly used type-C interface and other methods.

[0069] The input and display module is used to obtain and display the status of the power module, the data processor, the current pulse-phase sequence generator and the communication module; it is also used to provide a human-computer interaction interface so that the user can set the status of the portable integrated device. By setting the input and display module, the portable integrated device is equipped with a visual input window, which can realize the visualization and controllable operation of the simulation process. In addition, the communication module can be connected to the mobile terminal by wireless or wired mode according to the actual situation, and parameter setting and system control can also be realized. Usually, the wired mode can adopt I / O serial or parallel interface, optical fiber, etc., and the wireless mode can adopt Rola, wifi, etc. Exemplarily, the input and display module is connected to the data processing module to provide corresponding display values ​​for the status of the integrated device, including the power of the power unit, the working status of the current pulse-phase sequence generator subsystem and the communication module; it can also provide manual input means when the communication module cannot communicate with the mobile terminal, such as the restart of the integrated device, the pause, restart, and cycle repetition of the current pulse-phase sequence generator.

[0070] It should be noted that in this embodiment, in addition to the main data processing function, the data processing module can also be equipped with other additional functions as needed, such as: device self-test, self-diagnosis, external environmental parameter monitoring, external process control record and data storage, etc. For example, monitor the power of the power module, test whether the components in the integrated device can work normally, test whether the communication mode can be connected and data can be exchanged with the mobile terminal, etc. Monitor the temperature, humidity and background electromagnetic noise signals at the location of the integrated device.

[0071] During the specific implementation process, according to the actual application scenario, the mobile terminal can be a portable terminal such as a smart phone, tablet, laptop computer, etc. equipped with software that maintains data communication with the integrated device.

[0072] Specific embodiment 2 of the present invention discloses a device detection method based on the portable universal AC partial discharge pulse group generating system. The flow chart of the device detection method is as follows: Figure 4 As shown, the following steps are included:

[0073] Step S1: Set the AC electrical equipment and the type of artificial defect discharge to be tested; use the PD detection instrument or online monitoring system as the device to be tested, and select the sensor in the transmitter according to the device to be tested.

[0074] Preferably, in this embodiment, the AC electrical equipment mainly includes a transformer, a GIS or a switch cabinet. In the specific implementation process, the transmitter is selected according to the actual situation of the PD detection instrument or the online monitoring system (such as AE / TEV / UHF detection instrument or system).

[0075] In general, for:

[0076] (1) AE / TEV live detection instrument / online monitoring system, usually set another AE / TEV sensor as a transmitter near the AE / TEV sensor connected to the instrument / system under test. For example, Figure 5 This is a schematic diagram of the connection relationship of the AE / TEV live detection instrument for switch cabinets. By setting another AE / TEV sensor as a transmitter, it is mainly suitable for AE / TEV live detection of GIS and switch cabinets.

[0077] (2) UHF live detection instrument / online monitoring system: If there are multiple embedded sensors, select one of them as the transmitter, and the other embedded sensors are connected to the instrument / system under test as the tested object. For example, Figure 6 This is a connection diagram for the transformer UHF online monitoring system. By selecting a pre-buried sensor as a transmitter, it is mainly suitable for the transformer UHF. In addition, for transformer / reactor equipment, if there is only one pre-buried UHF sensor, an oil valve intrusion probe sensor can also be configured as a transmitter. Specifically, the oil valve intrusion sensor is a method of UHF operation, which can use the built-in UHF sensor of the equipment's oil drain valve under power-on / power-off conditions.

[0078] Step S2: The data processor draws and loads a reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type, and generates a corresponding transient current pulse group by the current pulse-phase sequence generator and outputs it to the transmitter.

[0079] For example, the AE AC PRPD spectra corresponding to GIS artificial defects are as follows: Figure 7-9 As shown, Figure 7 Corresponding to the tip defect, Figure 8 Corresponding to air gap defects, Fig. 9 Corresponding to suspension defects.

[0080] Step S3: The transmitter forms a transient physical field simulating a PD source in the casing and inside of the AC electrical equipment based on the received transient current pulse group.

[0081] Specifically, the maximum amplitude (peak value) of the transient current pulse group is adjusted according to the discharge amounts of 5 pC, 50 pC and 500 pC. The corresponding relationship between the amplitude of the transient current pulse group and the discharge value is established in accordance with the sensitivity verification requirements specified in GB / T 42287-2022 "High voltage test technology - Electromagnetic and acoustic methods for measuring partial discharge".

[0082] Step S4: The device under test detects the transient physical field of the simulated PD source, records the test AC PRPD spectrum, and obtains the defect type identification result of the test AC PRPD spectrum; determines whether the defect type identification result of the test AC PRPD spectrum is consistent with the given artificial defect discharge type. If they are consistent, it indicates that the device under test is working normally; otherwise, the device under test is working abnormally.

[0083] Specifically, by comparing the sent AC PRPD spectrum with the PRPD spectrum recorded by the instrument / system under test, and checking whether the discrimination result given by the instrument / system under test is consistent with the defect type of the given AC PRPD spectrum, it is possible to evaluate whether it works normally and meets the requirements of PD detection. Exemplarily, when testing an AE instrument / system on a GIS, for example, the above system loads the tip.txt file under the AE working condition, and the AE instrument / system under test gives the current record of tip discharge, then the AE instrument / system works normally and meets the PD detection requirements; if other discrimination results are given, the instrument under test is unqualified.

[0084] Preferably, if the portable universal AC partial discharge pulse group generating system includes a mobile terminal, after executing step S1, the following steps are further performed:

[0085] The mobile terminal is used to send the AC PRPD data file of the current artificial defect discharge type to the data processor.

[0086] In summary, this embodiment aims at the problem that users such as power supply companies do not have the technical means to judge and evaluate whether the AE, TEV and UHF method 3 types of PD instruments and the online monitoring systems that have been put into operation can work normally and meet the requirements of PD detection. The above portable universal AC partial discharge pulse group generation system and its equipment detection method are designed. In this embodiment, the system adopts the form of a portable, integrated device with a visual input window, and the signal injection of the transient current pulse group can be equipped with a transmitter, which can be well adapted to different working scenarios and meet on-site needs. In addition, the amplitude intensity of a single transient current pulse generated by the current pulse-phase sequence generator is adjustable, and the signal generated by the PD source can be truly simulated in the time domain and frequency domain, and the phase distribution characteristics are also consistent with the real PD source, so that accurate detection of the equipment can be achieved.

[0087] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0088] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A portable universal AC partial discharge pulse group generating system, characterized in that: The system includes a mobile terminal, a data processor, a current pulse-phase sequence generator and a transmitter; wherein, The mobile terminal is used to pre-store AC PRPD data files corresponding to various artificial defect discharge types, which are obtained by setting artificial defect models of corresponding artificial defect discharge types in laboratory real equipment; the AC PRPD data files include: reference time of partial discharge events and their corresponding amplitudes under the corresponding artificial defect discharge types; and is also used to select the AC PRPD data files of the corresponding artificial defect discharge types according to the artificial defect discharge types tested by the AC electrical equipment, and transmit them to the data processor; The data processor is used to perform coordinate conversion on each reference time in the AC PRPD data file according to a fixed period according to the AC PRPD data file of the current artificial defect discharge type, convert it into a phase, and match the phase and the peak value, so as to draw a peak-phase sequence, and load it to form a reference AC PRPD spectrum; The current pulse-phase sequence generator is used to receive and process the reference AC PRPD spectrum to generate a corresponding transient current pulse group; The transmitter is used to form a transient physical field simulating a PD source in and inside the casing of the AC electrical equipment based on the transient current pulse group; The current pulse-phase sequence generator performs the following operations to generate a corresponding transient current pulse group: processing the reference AC PRPD spectrum to generate corresponding peak-phase distribution characteristics, selecting all single transient current pulses that meet the peak corresponding rising edge time of less than 10ns, half-peak width time of less than 50ns, and duration of less than 100ns to form a transient current pulse group.

2. The portable universal AC partial discharge pulse group generating system according to claim 1 is characterized in that: The sensors built into the transmitter include AE ​​sensors, TEV sensors and pre-buried UHF sensors; A PD detection mode is determined according to the artificial defect discharge type, and a sensor matching the PD detection mode is selected from the transmitter.

3. The portable universal AC partial discharge pulse group generating system according to claim 2 is characterized in that: The system also includes a power module, an input and display module and a communication module; wherein, The power module, input and display module, data processor, current pulse-phase sequence generator and communication module form a portable integrated device.

4. The portable universal AC partial discharge pulse group generating system according to claim 3 is characterized in that: The portable integrated device is connected to the transmitter via a coaxial cable and connected to the mobile terminal via a communication module.

5. The portable universal AC partial discharge pulse group generating system according to claim 4 is characterized in that: The input and display module is used to obtain and display the status of the power module, the data processor, the current pulse-phase sequence generator and the communication module; it is also used to provide a human-computer interaction interface so that the user can set the status of the portable integrated device.

6. The portable universal AC partial discharge pulse group generating system according to any one of claims 1 to 5, characterized in that: Rise time , half peak width time , Peak duration Respectively expressed as: (1) (2) (3) in, , They represent the time corresponding to 10% and 90% of the rising edge of the transient current pulse respectively; Indicates the peak value of transient current pulse The second moment corresponding to the express The second moment corresponding to the Indicates the peak value of the transient current pulse; Indicates the time corresponding to the apparent zero point of the transient current pulse.

7. A device detection method based on the portable universal AC partial discharge pulse group generating system according to any one of claims 1 to 6, characterized in that: The device detection method comprises the following steps: Set the AC electrical equipment and the type of artificial defect discharge to be tested; take the PD detection instrument or online monitoring system as the device to be tested, and select the sensor in the transmitter according to the device to be tested; The data processor draws and loads the reference AC PRPD spectrum according to the AC PRPD data file of the current artificial defect discharge type, and generates the corresponding transient current pulse group by the current pulse-phase sequence generator and outputs it to the transmitter; The transmitter forms a transient physical field simulating a PD source in and inside the housing of the AC electrical equipment based on the received transient current pulse group; The device under test detects the transient physical field of the simulated PD source, records the test AC PRPD spectrum, and obtains the defect type identification result of the test AC PRPD spectrum; determines whether the defect type identification result of the test AC PRPD spectrum is consistent with the given artificial defect discharge type. If they are consistent, it indicates that the device under test is working normally; otherwise, the device under test is working abnormally.

8. The device detection method according to claim 7, characterized in that: The device detection method further comprises the following steps: After selecting the sensor in the transmitter, first use the mobile terminal to send the AC PRPD data file of the current artificial defect discharge type to the data processor.

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