Converter transformer partial discharge signal acquisition phase synchronization method and device

Abstract

The invention discloses a converter transformer partial discharge signal acquisition phase synchronization method and device, and belongs to the technical field of power system partial discharge measurement, and the method comprises the steps: obtaining a voltage signal acquired at a secondary side of a converter transformer and a time synchronization signal thereof; calculating the frequency of the voltage signal and the power frequency phase of the whole second moment according to the voltage signal and the corresponding time synchronization signal; acquiring a partial discharge signal and a time synchronization signal of the converter transformer, and performing timestamp marking; acquiring a power frequency phase of a whole second moment in a fixed period, calculating the power frequency phase of each partial discharge signal sampling point by combining the whole second moment, the timestamp of each partial discharge signal sampling point and the frequency of the voltage signal, and generating a partial discharge PRPD spectrogram; wherein the time synchronization signals of the voltage signal and the partial discharge signal are based on the same time system. According to the method, accumulative errors in a distributed system can be eliminated, and an accurate and synchronous partial discharge spectrogram is generated under the condition that a large number of cables do not need to be laid.

Description

Technical Field

[0001] This invention relates to the field of partial discharge measurement technology in power systems, and in particular to a method and apparatus for phase synchronization of partial discharge signal acquisition in converter transformers. Background Technology

[0002] Partial discharge in primary power system equipment is closely related to the internal electric field strength of the insulation. Since the power frequency voltage determines the periodic changes in the electric field, there is a fixed phase correlation between the partial discharge signal and the power frequency voltage. Specifically, corona discharge typically occurs near the voltage peak; positive and negative polarity discharges exhibit different characteristics at the voltage rising and falling edges; internal discharges are mostly symmetrically distributed near the voltage peaks of both positive and negative half-cycles; surface discharges often occur near the voltage zero-crossing point and are asymmetrical between the positive and negative half-cycles; and floating potential discharges have no fixed phase pattern. Analyzing the phase relationship using PRPD (Partial Discharge Phase Difference) maps can effectively distinguish between real discharges and external interference, identify discharge types, assess the degree of insulation aging, and, combined with multi-point phase difference analysis, locate the discharge source. Therefore, the phase relationship between the partial discharge signal and the power frequency voltage in primary power system equipment is the core analytical basis for online partial discharge monitoring.

[0003] Partial discharge monitoring of primary equipment in power systems can be achieved through sensing methods such as light, sound, and electricity. The voltage amplitude and frequency output by the sensors are related to the discharge intensity, and the phase of the discharge peak is related to the phase of the power frequency voltage. Therefore, it is necessary to collect the power frequency voltage as a reference phase for PRPD spectrum analysis. The online partial discharge monitoring system for converter transformers based on multi-modal monitoring methods adopts a distributed architecture. The acquisition devices for ultra-high frequency partial discharge online monitoring, high frequency current online monitoring, and high frequency voltage online monitoring all need to be connected to the secondary voltage signal of the AC voltage transformer on the grid side of the converter transformer, which requires the laying of a large number of cables, causing inconvenience in on-site construction. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and device for phase synchronization of partial discharge signal acquisition in converter transformers, which can eliminate the accumulated error in distributed systems and generate accurate and synchronized partial discharge spectra without the need to lay a large number of cables.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a phase synchronization method for acquiring partial discharge signals from a converter transformer, comprising:

[0007] Acquire the voltage signal and its time synchronization signal collected from the secondary side of the converter transformer;

[0008] The voltage signal is preprocessed, and the frequency of the voltage signal and the power frequency phase at integer seconds are calculated based on the preprocessed voltage signal and the corresponding time synchronization signal.

[0009] Acquire the partial discharge signal and its time synchronization signal of the converter transformer;

[0010] The timestamps of the partial discharge signal sampling points are obtained based on the time synchronization signal of the partial discharge signal.

[0011] Obtain the power frequency phase at integer seconds under a fixed period, and calculate the power frequency phase of the partial discharge signal sampling points by combining the integer seconds, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal.

[0012] A partial discharge PRPD spectrum is generated based on the power frequency phase of the partial discharge signal sampling points.

[0013] The voltage signal and the partial discharge signal are based on the same time system.

[0014] Optionally, the signal preprocessing includes filtering and amplitude adjustment.

[0015] Optionally, the calculation process for the power frequency phase at the integer second includes:

[0016] The zero-crossing time of the voltage signal is identified using a comparator or linear interpolation algorithm;

[0017] Calculate the time difference between the whole second and the zero-crossing time based on the zero-crossing time and the time synchronization signal;

[0018] The power frequency phase at integer seconds is calculated based on the time difference.

[0019] Optionally, the calculation process for the frequency of the voltage signal includes:

[0020] A timer is used to record the count value of the positive zero crossing of the voltage signal;

[0021] The frequency of the voltage signal is calculated based on the count value. :

[0022]

[0023] In the formula, This is the timer count value at the first positive zero crossing of the voltage signal. For voltage signal number 1 The timer count value at a positive zero crossing. This is the timer count value within 1 second; They are all based on the same time system.

[0024] Optionally, the calculation process for the power frequency phase at the integer second also includes:

[0025] Calculate the amplitude of the voltage signal during the sampling period. for:

[0026]

[0027] In the formula, For the first Voltage signal amplitude at each voltage signal sampling point This represents the number of voltage signal sampling points in the entire sampling period.

[0028] If the amplitude of the voltage signal during the sampling period If the amplitude is less than or equal to the amplitude threshold, then the power frequency phase at integer seconds in the sampling period is invalid.

[0029] Optionally, the step of obtaining the power frequency phase at integer seconds under a fixed period, and calculating the power frequency phase of the partial discharge signal sampling point by combining the integer seconds, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal, includes:

[0030] Based on the frequency of the voltage signal and the count value of the power frequency period timer Calculate the periodic timer count value of the voltage signal. :

[0031]

[0032] In the formula, For power frequency;

[0033] Using timestamps of whole seconds and the first The time difference is calculated from the timestamps of each partial discharge signal sampling point. ;

[0034] Based on the power frequency phase at integer seconds within a fixed period Time difference and periodic timer count value Calculate the first Power frequency phase of each partial discharge signal sampling point:

[0035] .

[0036] Secondly, the present invention provides a phase synchronization device for acquiring partial discharge signals of a converter transformer, comprising:

[0037] The host device is configured to acquire voltage signals and their time synchronization signals collected from the secondary side of the converter transformer; perform signal preprocessing on the voltage signals; and calculate the frequency of the voltage signals and the power frequency phase at integer seconds based on the preprocessed voltage signals and the corresponding time synchronization signals.

[0038] At least one partial discharge acquisition device is configured to acquire the partial discharge signal of the converter transformer and its time synchronization signal; acquire the integer second time and the timestamp of the partial discharge signal sampling point based on the time synchronization signal of the partial discharge signal; acquire the power frequency phase of the integer second time under a fixed period, and calculate the power frequency phase of the partial discharge signal sampling point by combining the integer second time, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal; and generate a partial discharge PRPD spectrum based on the power frequency phase of the partial discharge signal sampling point.

[0039] The communication module is configured to acquire the power frequency phase at whole-second intervals from the host device at fixed periods and send it to the partial discharge acquisition device;

[0040] The voltage signal and the partial discharge signal are based on the same time system.

[0041] Thirdly, the present invention provides an electronic device, including a processor and a storage medium;

[0042] The storage medium is used to store instructions;

[0043] The processor is configured to operate according to the instructions to perform the steps according to the method described above.

[0044] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0045] Fifthly, the present invention provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0046] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0047] This invention provides a method and apparatus for phase synchronization of partial discharge signal acquisition in a converter transformer. The method involves acquiring voltage signals, calculating their amplitude and frequency, and calculating the power frequency phase at a fixed time based on the time synchronization signal from a station-wide unified time synchronization system. It also involves acquiring partial discharge sensor signals and marking the discrete sampling points of these signals with absolute timestamps based on the time synchronization signal from the station-wide unified time synchronization system. The phase of the discrete sampling points is dynamically calibrated using the power frequency phase at a fixed time, eliminating accumulated errors in the distributed system and ultimately generating a synchronized partial discharge spectrum. In summary, this invention can eliminate accumulated errors in the distributed system and generate an accurate and synchronized partial discharge spectrum without requiring the laying of a large number of cables.

[0048] This invention innovatively uses the power frequency phase at a fixed moment in an absolute time system as the phase synchronization reference, avoiding repeated access of the system to AC voltage signals, simplifying the system architecture, and is especially suitable for multi-mode partial discharge monitoring systems for converter transformers. It can also be extended to other distributed power equipment status monitoring scenarios. Attached Figure Description

[0049] Figure 1 This is a schematic flowchart of the phase synchronization method for acquiring partial discharge signals of converter transformers provided in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the phase synchronization device for acquiring partial discharge signals of a converter transformer provided in an embodiment of the present invention;

[0051] Figure 3 This is a simplified system architecture diagram of the converter transformer partial discharge signal acquisition phase synchronization device provided in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0054] Example 1:

[0055] like Figure 1 As shown, this embodiment of the invention provides a phase synchronization method for acquiring partial discharge signals from a converter transformer, comprising the following steps:

[0056] Step S1: Acquire the voltage signal and its time synchronization signal collected from the secondary side of the converter transformer.

[0057] Step S2: Perform signal preprocessing on the voltage signal, and calculate the frequency of the voltage signal and the power frequency phase at whole seconds based on the preprocessed voltage signal and the corresponding time synchronization signal.

[0058] Voltage signals are typically acquired using AC voltage transformers.

[0059] Signal preprocessing typically includes filtering and amplitude adjustment. Filtering can remove noise at specific frequencies, smooth signals, and improve signal quality, while amplitude adjustment can change the signal gain and improve the accuracy of subsequent processing.

[0060] Specifically, in this embodiment, the calculation process for the power frequency phase at integer seconds includes:

[0061] The zero-crossing time of the voltage signal is identified using a comparator or linear interpolation algorithm;

[0062] Calculate the time difference between the integer second and the zero-crossing time based on the zero-crossing time and the time synchronization signal;

[0063] Calculate the power frequency phase at integer seconds based on the time difference.

[0064] The calculation process for the frequency of a voltage signal includes:

[0065] A timer is used to record the count value of the positive zero crossing of the voltage signal;

[0066] Calculate the frequency of the voltage signal based on the count value. :

[0067]

[0068] In the formula, This is the timer count value at the first positive zero crossing of the voltage signal. For voltage signal number 1 The timer count value at a positive zero crossing. This is the timer count value within 1 second; They are all based on the same time system.

[0069] Taking a 32-bit timer as an example, the sum of the count values ​​within M seconds is:

[0070]

[0071] In the formula, For the first The timer count value at the exact second. for Exceed Number of times, They are all based on the same time system.

[0072] Timer count value within 1 second for:

[0073]

[0074] Furthermore, the calculation process for the power frequency phase at integer seconds also includes:

[0075] Calculate the amplitude of the voltage signal during the sampling period. for:

[0076]

[0077] In the formula, For the first Voltage signal amplitude at each voltage signal sampling point This represents the number of voltage signal sampling points in the entire sampling period.

[0078] If the amplitude of the voltage signal during the sampling period If the amplitude is less than or equal to the amplitude threshold, the power frequency phase at integer seconds in the sampling period is invalid.

[0079] By invalidating specific power frequency phases, the accuracy of subsequent calculations can be improved.

[0080] Step S3: Obtain the partial discharge signal and its time synchronization signal of the converter transformer; the time synchronization signals of the voltage signal and the partial discharge signal are based on the same time system.

[0081] Partial discharge signals are typically sampled discretely using a high-speed ADC module at a sampling rate of at least 1 MHz.

[0082] Step S4: Obtain the whole second time and the timestamp of the partial discharge signal sampling point based on the time synchronization signal of the partial discharge signal.

[0083] Using the time synchronization signal, a timestamp accurate to the nanosecond level is marked for each partial discharge signal sampling point.

[0084] Step S5: Obtain the power frequency phase at the whole second of the fixed period, and calculate the power frequency phase of the partial discharge signal sampling point by combining the whole second, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal.

[0085] The fixed cycle typically uses no more than 50 power frequency cycles.

[0086] Specifically, it includes:

[0087] Based on the frequency of the voltage signal and the count value of the power frequency period timer Calculate the periodic timer count value of the voltage signal. :

[0088]

[0089] In the formula, For power frequency;

[0090] Using timestamps of whole seconds and the first The time difference is calculated from the timestamps of each partial discharge signal sampling point. ;

[0091] Based on the power frequency phase at integer seconds within a fixed period Time difference and periodic timer count value Calculate the first Power frequency phase of each partial discharge signal sampling point:

[0092] .

[0093] Step S6: Generate a partial discharge PRPD spectrum based on the power frequency phase of the partial discharge signal sampling points.

[0094] The phase synchronization method for partial discharge signal acquisition of converter transformers provided in this invention involves acquiring the secondary voltage signal of the AC voltage transformer on the grid side of the converter transformer, calculating the amplitude and frequency of the acquired voltage signal, and calculating the power frequency phase at a fixed time based on the time synchronization signal of the unified time synchronization system of the entire station. Using the partial discharge sensor signal, the discrete sampling points of the acquired partial discharge sensor signal are marked with absolute timestamps based on the time synchronization signal of the unified time synchronization system of the entire station, and the fixed-time power frequency phase is received via network messages. The phase of the discrete sampling points is dynamically calibrated using the fixed-time power frequency phase to eliminate accumulated errors in the distributed system, ultimately generating a synchronized partial discharge spectrum.

[0095] like Figure 2 As shown, this embodiment of the invention provides a phase synchronization device for acquiring partial discharge signals from a converter transformer, comprising:

[0096] The main unit is configured to acquire the voltage signal and its time synchronization signal collected from the secondary side of the converter transformer; perform signal preprocessing on the voltage signal; and calculate the frequency of the voltage signal and the power frequency phase at integer seconds based on the preprocessed voltage signal and the corresponding time synchronization signal.

[0097] The (Ultra-high, High-frequency, Ultrasonic) partial discharge acquisition device is configured to acquire the partial discharge signal and its timing signal of the converter transformer; acquire the integer second time and the timestamp of the partial discharge signal sampling point based on the timing signal of the partial discharge signal; acquire the power frequency phase of the integer second time under a fixed period, and calculate the power frequency phase of the partial discharge signal sampling point by combining the integer second time, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal; and generate a partial discharge PRPD spectrum based on the power frequency phase of the partial discharge signal sampling point.

[0098] The communication module is configured to acquire the power frequency phase of the whole second from the host device at fixed intervals and send it to the partial discharge acquisition device.

[0099] The voltage signal and the partial discharge signal are based on the same time system.

[0100] The converter transformer partial discharge signal acquisition phase synchronization device provided in this embodiment of the invention includes a host device that acquires the secondary voltage signal of the AC voltage transformer on the grid side of the converter transformer, calculates the amplitude and frequency of the acquired voltage signal, and calculates the power frequency phase at a fixed time based on the time synchronization signal of the unified time synchronization system of the entire station; the partial discharge acquisition device marks the discrete sampling points of the acquired partial discharge sensor signal with absolute timestamps based on the time synchronization signal of the unified time synchronization system of the entire station, and receives the fixed-time power frequency phase sent by the host through network messages; the partial discharge acquisition device dynamically calibrates the phase of the discrete sampling points by using the fixed-time power frequency phase, eliminates the accumulated error in the distributed system, and finally generates a synchronized partial discharge spectrum.

[0101] Example 3:

[0102] like Figure 3 As shown, this embodiment of the invention provides a phase synchronization device for acquiring partial discharge signals of a converter transformer, including: a time synchronization unit 201, a sampling unit 202, a phase processing unit 203, and a communication unit 204.

[0103] The time synchronization unit 201 is used to receive external time synchronization signals, such as multimode fiber IRIG-B code. Through 201, the timer counter value and absolute timestamp at the whole second can be obtained. The sampling unit 202 is used for analog quantity sampling. The host device uses 202 to sample the voltage signal of the secondary side of the voltage transformer, and the acquisition device uses 202 to sample the sensor signal. The phase processing unit 203 is used for phase synchronization. The host device uses 203 to calculate the power frequency phase at a fixed time (the power frequency phase at the whole second is used by default), and the acquisition device uses 203 to calculate the phase of discrete sampling points. The communication unit 204 is used to transmit the power frequency phase at the whole second from the host device to the partial discharge acquisition device at a fixed period, with the fixed period not exceeding 50 power frequency cycles.

[0104] This invention innovatively uses the power frequency phase at a fixed moment in an absolute time system as the phase synchronization reference, avoiding repeated access of the system to AC voltage signals, simplifying the system architecture, and is especially suitable for multi-mode partial discharge monitoring systems for converter transformers. It can also be extended to other distributed power equipment status monitoring scenarios.

[0105] Example 4:

[0106] like Figure 4 As shown, based on the phase synchronization method for acquiring partial discharge signals of converter transformers provided in Embodiment 1, this embodiment of the invention provides an electronic device, including a processor and a storage medium;

[0107] Storage media are used to store instructions;

[0108] The processor is used to perform operations according to instructions to execute the steps according to the method described above.

[0109] Example 5:

[0110] Based on the phase synchronization method for acquiring partial discharge signals of converter transformers provided in Embodiment 1, this embodiment of the invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above method.

[0111] Example 6:

[0112] Based on the phase synchronization method for acquiring partial discharge signals of converter transformers provided in Embodiment 1, this embodiment of the invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above method.

[0113] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0115] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0116] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0117] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A phase synchronization method for acquiring partial discharge signals from a converter transformer, characterized in that, include: Acquire the voltage signal and its time synchronization signal collected from the secondary side of the converter transformer; The voltage signal is preprocessed, and the frequency of the voltage signal and the power frequency phase at integer seconds are calculated based on the preprocessed voltage signal and the corresponding time synchronization signal. Acquire the partial discharge signal and its time synchronization signal of the converter transformer; The timestamps of the partial discharge signal sampling points are obtained based on the time synchronization signal of the partial discharge signal. Obtain the power frequency phase at integer seconds under a fixed period, and calculate the power frequency phase of the partial discharge signal sampling points by combining the integer seconds, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal. A partial discharge PRPD spectrum is generated based on the power frequency phase of the partial discharge signal sampling points. The voltage signal and the partial discharge signal are based on the same time system.

2. The phase synchronization method for acquiring partial discharge signals of converter transformers according to claim 1, characterized in that, The signal preprocessing includes filtering and amplitude adjustment.

3. The phase synchronization method for acquiring partial discharge signals of converter transformers according to claim 1, characterized in that, The calculation process for the power frequency phase at the whole second includes: The zero-crossing time of the voltage signal is identified using a comparator or linear interpolation algorithm; Calculate the time difference between the whole second and the zero-crossing time based on the zero-crossing time and the time synchronization signal; The power frequency phase at integer seconds is calculated based on the time difference.

4. The phase synchronization method for acquiring partial discharge signals of converter transformers according to claim 1, characterized in that, The calculation process for the frequency of the voltage signal includes: A timer is used to record the count value of the positive zero crossing of the voltage signal; The frequency of the voltage signal is calculated based on the count value. : ； In the formula, This is the timer count value at the first positive zero crossing of the voltage signal. For voltage signal number 1 The timer count value at a positive zero crossing. This is the timer count value within 1 second; They are all based on the same time system.

5. The phase synchronization method for acquiring partial discharge signals of a converter transformer according to claim 1, characterized in that, The calculation process for the power frequency phase at the whole second also includes: Calculate the amplitude of the voltage signal during the sampling period. for: ； In the formula, For the first The voltage signal amplitude at each voltage signal sampling point This represents the number of voltage signal sampling points in the entire sampling period. If the amplitude of the voltage signal during the sampling period If the amplitude is less than or equal to the amplitude threshold, then the power frequency phase at integer seconds in the sampling period is invalid.

6. The phase synchronization method for acquiring partial discharge signals of a converter transformer according to claim 1, characterized in that, The process of obtaining the power frequency phase at integer seconds within a fixed period, and calculating the power frequency phase of the partial discharge signal sampling points by combining the integer seconds, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal, includes: Based on the frequency of the voltage signal and the count value of the power frequency period timer Calculate the periodic timer count value of the voltage signal. : ； In the formula, For power frequency; Using timestamps of whole seconds and the first The time difference is calculated from the timestamps of each partial discharge signal sampling point. ; Based on the power frequency phase at integer seconds within a fixed period Time difference and periodic timer count value Calculate the first Power frequency phase of each partial discharge signal sampling point: 。 7. A phase synchronization device for acquiring partial discharge signals from a converter transformer, characterized in that, include: The host device is configured to acquire the voltage signal and its time synchronization signal collected from the secondary side of the converter transformer; The voltage signal is preprocessed, and the frequency of the voltage signal and the power frequency phase at integer seconds are calculated based on the preprocessed voltage signal and the corresponding time synchronization signal. At least one partial discharge acquisition device is configured to acquire the partial discharge signal of the converter transformer and its time synchronization signal; acquire the integer second time and the timestamp of the partial discharge signal sampling point based on the time synchronization signal of the partial discharge signal; acquire the power frequency phase of the integer second time under a fixed period, and calculate the power frequency phase of the partial discharge signal sampling point by combining the integer second time, the timestamp of each partial discharge signal sampling point, and the frequency of the voltage signal; and generate a partial discharge PRPD spectrum based on the power frequency phase of the partial discharge signal sampling point. The communication module is configured to acquire the power frequency phase at whole-second intervals from the host device at fixed periods and send it to the partial discharge acquisition device; The voltage signal and the partial discharge signal are based on the same time system.

8. An electronic device, characterized in that, Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-6.

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

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method described in any one of claims 1-6.

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