Discharge source positioning method, device and system and nonvolatile storage medium

Abstract

The invention discloses a discharge source positioning method, device and system and a nonvolatile storage medium. The method comprises the following steps: acquiring a plurality of high-frequency pulse electric signals respectively representing discharge characteristics at a plurality of positions; based on the multiple high-frequency pulse electric signals, whether the discharge position of the discharge source is located in the transformer is judged; and under the condition that the discharge position is located in the transformer, ultrasonic signals are collected, and a three-dimensional space positioning strategy is adopted, and the multiple high-frequency pulse electric signals and the ultrasonic signals are combined to determine the space three-dimensional coordinates of the discharge source. According to the invention, the technical problem of low efficiency of transformer partial discharge detection and positioning is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a discharge source positioning method, device, system and non-volatile storage medium. Background Art

[0002] Power transformers are the core hub equipment of substations and are also important equipment for achieving energy security and stable supply. Their safe and stable operation is the fundamental premise and key guarantee for achieving reliable transmission of large-capacity and long-distance electric energy. Power equipment is the infrastructure of the energy and power system. As the whole society's requirements for power reliability are increasing, the energy and power departments have an increasingly urgent need for the status operation and maintenance and intelligent management and control of power equipment.

[0003] Before a power transformer fails due to internal insulation defects, it is generally accompanied by partial discharge of varying degrees and forms. As an important technical means for early detection and early warning of insulation defects in power equipment, partial discharge has been widely used in insulation status monitoring and live inspections of transformers, cables and switchgear, and has accumulated a wealth of failure cases and experience analysis methods.

[0004] Due to the special metal shielding structure of power transformers, the UHF method cannot be used for effective testing. Currently, among the methods for detecting partial discharge of power transformers, the high-frequency detection method and the ultrasonic method are the most widely used. There are already some commercial products on the market that have carried out practical work in high-frequency detection and ultrasonic detection of power transformers, but the efficiency of the detection method for partial discharge of transformers is still low.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiments of the present invention provide a discharge source positioning method, device, system and non-volatile storage medium to at least solve the technical problem of low efficiency in transformer partial discharge detection and positioning.

[0007] According to one aspect of an embodiment of the present invention, a method for locating a discharge source is provided, comprising: acquiring a plurality of high-frequency pulse electrical signals respectively characterizing discharge characteristics at a plurality of positions; judging whether a discharge position of the discharge source is located inside a transformer based on the plurality of high-frequency pulse electrical signals; and when the discharge position is located inside the transformer, collecting an ultrasonic signal, and adopting a three-dimensional spatial positioning strategy, combining the plurality of high-frequency pulse electrical signals and the ultrasonic signal, to determine the spatial three-dimensional coordinates of the discharge source.

[0008] Optionally, judging whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals includes: determining the pulse polarities, spectrum energy distribution and propagation paths of the multiple high-frequency pulse electrical signals; matching the pulse polarities, spectrum energy distribution and propagation paths of the multiple high-frequency pulse electrical signals with the pulse polarities, spectrum energy distribution and propagation paths corresponding to discharges at multiple predetermined discharge positions, and determining the discharge position of the discharge source among the multiple predetermined discharge positions; and judging whether the discharge position of the discharge source is located inside the transformer.

[0009] Optionally, the plurality of positions include a high voltage outlet line, a neutral point, a casing and an iron core.

[0010] Optionally, the multiple predetermined discharge positions include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer; wherein, the first wave polarity of the time domain first wave of the signals of each detection end of the transformer external discharge interference is the same, and the spectrum energy is concentrated in the low frequency; the first wave polarity of the transformer winding main insulation discharge winding head end, neutral point and shell detection signal is opposite, and the first wave polarity of the transformer winding longitudinal insulation discharge winding head end and neutral point detection signal is opposite; the first wave polarity of the time domain first wave of the transformer internal non-winding discharge detection end signals is the same, and the spectrum energy is concentrated in the high frequency.

[0011] Optionally, when the discharge position is located inside the transformer, ultrasonic signals are collected, and a three-dimensional spatial positioning strategy is adopted to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source, including: when the discharge position is located inside the transformer, based on any one of the multiple high-frequency pulse electrical signals, triggering a synchronous collection signal; collecting an ultrasonic signal according to the synchronous collection signal; and adopting a spatial grid search positioning algorithm included in the three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signal to determine the spatial three-dimensional coordinates of the discharge source.

[0012] According to another aspect of an embodiment of the present invention, a discharge source positioning device is further provided, comprising: an acquisition module, used to acquire multiple high-frequency pulse electrical signals respectively characterizing discharge characteristics at multiple positions; a judgment module, used to judge whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; and a positioning module, used to collect ultrasonic signals when the discharge position is located inside the transformer, and adopt a three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source.

[0013] According to another aspect of an embodiment of the present invention, a discharge source positioning system is provided, comprising: a high-frequency current system for collecting a plurality of high-frequency pulse electrical signals respectively characterizing discharge characteristics at a plurality of positions; a positioning device for acquiring the plurality of high-frequency pulse electrical signals; and for determining whether the discharge position of the discharge source is located inside a transformer based on the plurality of high-frequency pulse electrical signals; and for collecting ultrasonic signals when the discharge position is located inside the transformer, and adopting a three-dimensional spatial positioning strategy to combine the plurality of high-frequency pulse electrical signals and the ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source; and an ultrasonic system for collecting the ultrasonic signals.

[0014] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned discharge source locating methods.

[0015] According to another aspect of the embodiments of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above-mentioned discharge source locating methods is executed.

[0016] According to yet another aspect of an embodiment of the present invention, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, any one of the above-mentioned discharge source locating methods is implemented.

[0017] In an embodiment of the present invention, a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions are obtained; based on the plurality of high-frequency pulse electrical signals, whether the discharge position of the discharge source is located inside the transformer is determined; when the discharge position is located inside the transformer, an ultrasonic signal is collected, and a three-dimensional spatial positioning strategy is adopted to combine the plurality of high-frequency pulse electrical signals and the ultrasonic signal to determine the spatial three-dimensional coordinates of the discharge source, so that the partial discharge phenomenon inside the transformer can be effectively identified, and the three-dimensional precise positioning of the partial discharge can be performed, thereby achieving the technical effect of efficiently and accurately performing transformer detection, and further solving the technical problem of low efficiency in transformer partial discharge detection and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a computer terminal for implementing a discharge source location method is shown;

[0020] Figure 2is a schematic diagram of a flow chart of a discharge source locating method provided according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the pulse propagation characteristics of an external interference signal provided according to an optional embodiment of the present invention;

[0022] Figure 4 4 is a structural block diagram of a discharge source locating device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] According to an embodiment of the present invention, a method embodiment for locating a discharge source is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0026] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 FIG. 1 shows a hardware structure block diagram of a computer terminal for implementing a method for locating a discharge source. Figure 1As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0027] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0028] The memory 104 can be used to store software programs and modules of application software, such as program instructions / data storage devices corresponding to the discharge source locating method in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the discharge source locating method of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0029] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0030] Due to the special metal shielding structure of power transformers, the UHF method cannot carry out effective testing. Currently, among the methods for partial discharge detection of power transformers, high-frequency detection and ultrasonic methods are the most widely used. There are already some commercial products on the market that have carried out practical work in high-frequency detection and ultrasonic detection of power transformers, but there are still outstanding problems in the following aspects: (1) The signal coupling point is single, and it is impossible to locate and distinguish internal and external signals of the equipment, and it is difficult to eliminate interference; (2) The electrical and acoustic signals are detected in isolation, lacking the organic integration and positioning of multi-dimensional information; (3) There is a risk of misjudgment and equipment being put into operation with defects. The operation and inspection department urgently needs to develop efficient and reliable PD monitoring methods.

[0031] Therefore, developing a solution that can integrate electrical signals and ultrasonic partial discharge detection technology for practical application is an urgent need in the current technology field.

[0032] Figure 2 FIG. 1 is a flow chart of a method for locating a discharge source according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0033] Step S202 , obtaining a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions.

[0034] In this step, it is first necessary to obtain high-frequency pulse electrical signals at multiple locations, which can be collected in real time by sensors or detection equipment. These electrical signals can characterize discharge characteristics, such as discharge intensity, frequency, etc., for subsequent discharge position judgment and positioning.

[0035] Step S204: based on the multiple high-frequency pulse electrical signals, determine whether the discharge position of the discharge source is located inside the transformer.

[0036] In this step, by comparing the characteristics of multiple high-frequency pulse electrical signals, it is determined whether the discharge position of the discharge source is located inside the transformer. This step can be achieved through a machine learning algorithm or a program set according to expert knowledge, thereby improving the accuracy and efficiency of locating the discharge source.

[0037] Step S206, when the discharge position is located inside the transformer, collect ultrasonic signals, and adopt a three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the three-dimensional spatial coordinates of the discharge source.

[0038] In this step, if the discharge position is indeed inside the transformer, the ultrasonic signal needs to be collected next. The ultrasonic signal can be obtained in real time inside the transformer through an ultrasonic sensor to locate the specific location of the discharge source. Combining multiple high-frequency pulse electrical signals and ultrasonic signals, the three-dimensional coordinates of the discharge source can be determined through a three-dimensional spatial positioning strategy, thereby achieving accurate positioning of the discharge source.

[0039] Through the above steps, the partial discharge phenomenon inside the transformer can be effectively identified, and the three-dimensional precise positioning of the partial discharge can be performed, thereby achieving the technical effect of efficient and accurate transformer detection, and further solving the technical problem of low efficiency of transformer partial discharge detection and positioning.

[0040] As an optional embodiment, based on multiple high-frequency pulse electrical signals, judging whether the discharge position of the discharge source is located inside the transformer includes: determining the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals; matching the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals with the pulse polarity, spectrum energy distribution and propagation path corresponding to the discharge at multiple predetermined discharge positions, and determining the discharge position of the discharge source among the multiple predetermined discharge positions; judging whether the discharge position of the discharge source is located inside the transformer.

[0041] Optionally, the present embodiment aims to determine whether the discharge position of the discharge source is located inside the transformer by analyzing the characteristics of multiple high-frequency pulse electrical signals. First, the pulse polarity, spectrum energy distribution and propagation path of multiple high-frequency pulse electrical signals can be determined. By analyzing the high-frequency pulse electrical signals, their pulse polarity (positive or negative), spectrum energy distribution and propagation path characteristics can be obtained. Secondly, the pulse polarity, spectrum energy distribution and propagation path of multiple high-frequency pulse electrical signals can be matched with the pulse polarity, spectrum energy distribution and propagation path corresponding to the discharge of multiple predetermined discharge positions. According to the characteristics of the predetermined discharge position, the characteristics of the high-frequency pulse signal obtained by analysis are compared with it to find the matching discharge position. Through the matching results, the discharge position of the discharge source can be determined in multiple predetermined discharge positions. Finally, it can be judged whether the discharge position of the discharge source is located inside the transformer to determine whether the discharge source is discharged inside the transformer.

[0042] By analyzing the signal characteristics through the above steps, it is possible to effectively distinguish between internal discharge and external interference in the transformer, improve the accuracy and reliability of positioning, and is suitable for locating the discharge source of the transformer in various complex electromagnetic environments, so as to timely discover the fault conditions inside the transformer and improve the safety and reliability of the transformer.

[0043] It should be noted that after the discharge occurs inside the transformer, the discharge pulse will propagate along the winding, main insulation capacitance, stray capacitance between oil gaps to each output terminal and grounding terminal of the transformer, including high-voltage output line, neutral point grounding, shell grounding, core grounding, etc. The discharge in different areas inside the transformer corresponds to different propagation paths, and completely different response information will be generated at each output terminal and grounding terminal; that is, the discharge in different areas corresponds to different propagation paths.

[0044] For ease of understanding, external discharge is used as an example.

[0045] Figure 3 It is a schematic diagram of the pulse propagation characteristics of the external interference signal provided according to an optional embodiment of the present invention. When the external interference is transmitted into the transformer through the busbar, the discharge pulse will propagate to each topological branch of the transformer through the wire and capacitor coupling. Since each propagation path is the same-direction coupling of the discharge source through the wire or capacitor effect, the pulse current flows in the same direction in each shunt branch. There are three typical propagation paths. Path 1: the starting point of the external interference source, the high-voltage side lightning arrester, the lightning arrester grounding wire, the grounding bus, and the external interference source terminal; Path 2: the starting point of the external interference source, the high-voltage bushing, the casing, the casing grounding wire, the grounding bus, and the external interference source terminal; Path 3: the starting point of the external interference source, the high-voltage bushing, the winding, the neutral point bushing, the neutral point grounding wire, the grounding bus, and the external interference source terminal; The current loop of the pulse signal is as follows: Figure 3 As shown in the figure, since there is also a capacitive coupling effect between the winding and the iron core, the pulse current signal of the discharge will also form a current shunt between the winding and the iron core.

[0046] It can be seen that when external interference discharge is coupled into the transformer, the directions of the pulse current at the high-voltage side grounding terminal (through the arrester or bushing), the pulse current at the neutral point grounding wire, the pulse current at the shell grounding wire, and the pulse current at the core grounding wire are all in the same direction. This condition can be used to assist in determining the external interference discharge fault.

[0047] The polarity rule is used to distinguish whether it is winding discharge. Finally, the spectrum energy rule is used to extract the high-low frequency energy ratio to distinguish external discharge interference from non-winding discharge inside the transformer. The polarity rule is shown in Table 1.

[0048] Table 1 Polarity rules of different discharge forms

[0049]

[0050] It can be seen that when external interference discharge is coupled into the transformer, the directions of the pulse current at the high-voltage side grounding terminal (through the arrester or bushing), the neutral point grounding wire pulse current, the casing grounding wire pulse current and the core grounding pulse current are all in the same direction. This condition can be used to assist in determining the external interference discharge fault.

[0051] As an optional embodiment, the multiple locations include a high-voltage outlet line, a neutral point, a casing, and an iron core.

[0052] Optionally, the high-voltage outlet is the output end of the transformer. By monitoring the high-voltage outlet, the output voltage and current of the transformer can be understood, and then it can be determined whether discharge occurs. The neutral point is the connection point connecting the high-voltage and low-voltage sides of the transformer, and is usually also the grounding point. By monitoring the neutral point, the voltage balance inside the transformer can be understood, and whether there is a discharge problem inside the transformer can also be detected. The transformer casing is usually grounded and can be used as a loop for the discharge current. Monitoring the casing can understand the grounding condition of the transformer and can also detect whether there is an external discharge phenomenon. The iron core is an important part of the transformer. By monitoring the iron core, the magnetic field inside the transformer can be understood, and then it can be determined whether there is a partial discharge or other discharge problem. By arranging sensors at multiple key positions of the transformer, the discharge characteristics can be fully captured to ensure the comprehensiveness and accuracy of positioning, which is suitable for comprehensive health monitoring and fault diagnosis of the transformer.

[0053] As an optional embodiment, multiple predetermined discharge positions include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer; wherein, the first wave polarity of the time domain first wave of the transformer external discharge interference signals at each detection end is the same, and the spectrum energy is concentrated in the low frequency; the first wave polarity of the transformer winding main insulation discharge winding head end, neutral point and shell detection signal is opposite, and the first wave polarity of the transformer winding longitudinal insulation discharge winding head end and neutral point detection signal is opposite; the first wave polarity of the transformer internal non-winding discharge detection end signals at each detection end is the same, and the spectrum energy is concentrated in the high frequency.

[0054] Optionally, in this embodiment, the characteristics of the signals monitored at multiple locations when discharging at multiple predetermined discharge locations may be predetermined, and then the signal characteristics at the multiple locations actually detected may be matched with the predetermined signal characteristics. Multiple predetermined discharge locations include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer. When the discharge occurs outside the transformer, the time domain first wave polarity of the signal is the same, and the spectrum energy is concentrated in the low frequency. This situation may be caused by the insulation outside the transformer being damaged or contaminated, which causes the discharge and requires timely detection and repair; when the discharge occurs in the main insulation of the transformer winding, the first wave polarity of the discharge winding head end, the neutral point and the shell detection signal is opposite. This situation may be caused by the discharge caused by the damage of the main insulation of the winding, which requires timely detection and repair; when the discharge occurs in the longitudinal insulation of the transformer winding, the first wave polarity of the discharge winding head end and the neutral point detection signal is opposite. This situation may be caused by the discharge caused by the damage of the longitudinal insulation of the winding, which requires timely detection and repair; when the discharge occurs in the non-winding part inside the transformer, the time domain first wave polarity of the signals of each detection end is the same, and the spectrum energy is concentrated in the high frequency. This situation may be caused by the discharge phenomenon in other parts inside the transformer, which requires timely detection and repair.

[0055] By pre-detecting and analyzing the discharge characteristics of different positions, maintenance personnel can timely understand the insulation condition of the transformer, prevent possible faults in advance, and ensure the safe operation of the transformer.

[0056] As an optional embodiment, when the discharge position is located inside the transformer, ultrasonic signals are collected, and a three-dimensional spatial positioning strategy is adopted to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source, including: when the discharge position is located inside the transformer, based on any one of the multiple high-frequency pulse electrical signals, triggering a synchronous collection signal; collecting an ultrasonic signal based on the synchronous collection signal; and using a spatial grid search positioning algorithm included in the three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source.

[0057] Optionally, when discharge occurs inside the transformer, this optional embodiment uses high-frequency pulse electrical signals and ultrasonic signals to accurately locate the location of the discharge source. First, if it is detected that the partial discharge phenomenon of the transformer occurs inside the transformer, the partial discharge will be further located; if the partial discharge phenomenon occurs outside the transformer, it means that the partial discharge phenomenon of the transformer is affected by external interference and no further location is required.

[0058] Then, when the discharge occurs, the mechanical vibrations generated by the discharge event can be sensed by the ultrasonic sensor and an ultrasonic signal can be obtained. Therefore, the ultrasonic signal can reflect the location where the local discharge occurs. In order to ensure that the collected ultrasonic signal is synchronized with the discharge event, the synchronous collection signal can be triggered based on any one of the multiple high-frequency pulse electrical signals.

[0059] Finally, in order to determine the spatial three-dimensional coordinates of the discharge source, a three-dimensional spatial positioning strategy can be used. A three-dimensional grid model can be created to divide the space inside the transformer into many small cubic units, and a spatial grid search positioning algorithm can be used to search and locate the discharge source in the three-dimensional grid. The algorithm combines the collected multiple high-frequency pulse electrical signals and ultrasonic signals, and analyzes the characteristics of these signals (such as signal strength, propagation time difference, etc.) to infer which cell the discharge source may be located in. Through the above strategies and algorithms, the precise three-dimensional coordinates of the discharge source inside the transformer can be finally determined. This helps technicians quickly locate the fault point, thereby performing effective maintenance and troubleshooting.

[0060] The advantages of this method include high accuracy and real-time performance, which can respond quickly when internal discharge occurs in the transformer and provide accurate fault location information, which is crucial to ensure the stable operation of the power system and improve the maintenance efficiency of the transformer.

[0061] In the three-dimensional spatial positioning of ultrasonic signals, a more flexible and accurate three-dimensional spatial network search algorithm is used to replace the traditional method of inverting the time delay equations, ensuring that accurate positioning results can be obtained even when multiple sensors are in the same plane.

[0062] In electro-acoustic joint positioning, it is necessary to synchronously match the pulse triggering and spatial three-dimensional positioning of the corresponding multi-port acoustic signal according to the electrical positioning result of each electrical signal to achieve electro-acoustic joint positioning with single pulse accuracy.

[0063] The above scheme, after eliminating interference from the detected multi-terminal electrical signals, only performs ultrasonic signal positioning on the internal valid discharge information, avoiding the blind large-scale calculations and the inability to eliminate interference of traditional single ultrasonic signal positioning; and at the positioning execution level, the technical scheme uses electrical signals as a reference to trigger ultrasonic signals, optimizes the triggering mechanism of ultrasonic signals, ensures the effective triggering of ultrasonic signals, and realizes the fusion application of electrical signals and ultrasonic signals, overcoming the disadvantages of traditional single ultrasonic signals that are easily triggered by interference signals and excessive triggering, resulting in a long acquisition dead zone and loss of effective discharge information.

[0064] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0065] Through the description of the above implementation, those skilled in the art can clearly understand that the discharge source location method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0066] According to an embodiment of the present invention, a discharge source locating device for implementing the above-mentioned discharge source locating method is also provided. Figure 4 is a structural block diagram of a discharge source locating device provided according to an embodiment of the present invention, such as Figure 4 As shown, the discharge source locating device includes: an acquisition module 42, a judgment module 44 and a locating module 46. The discharge source locating device is described below.

[0067] The acquisition module 42 is used to acquire a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions.

[0068] The judgment module 44 is connected to the acquisition module 42 and is used to judge whether the discharge position of the discharge source is located inside the transformer based on a plurality of high-frequency pulse electrical signals.

[0069] The positioning module 46 is connected to the judgment module 44 and is used to collect ultrasonic signals when the discharge position is inside the transformer, and adopt a three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source.

[0070] It should be noted that the acquisition module 42, the determination module 44 and the positioning module 46 correspond to steps S202 to S206 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

[0071] According to an embodiment of the present invention, a discharge source locating system for implementing the above-mentioned discharge source locating method is also provided. The discharge source locating system includes: a high-frequency current system, a locating device and an ultrasonic system. The discharge source locating system is described below.

[0072] A high-frequency current system is used to collect multiple high-frequency pulse electrical signals that respectively characterize discharge characteristics at multiple positions; a positioning device is used to obtain multiple high-frequency pulse electrical signals; it is also used to determine whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; it is also used to collect ultrasonic signals when the discharge position is located inside the transformer, and adopt a three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source; an ultrasonic system is used to collect ultrasonic signals.

[0073] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0074] The memory can be used to store software programs and modules, such as program instructions / modules corresponding to the discharge source locating method and device in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the above-mentioned discharge source locating method is realized. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0075] The processor can call the information and application program stored in the memory through the transmission device to perform the following steps: obtain multiple high-frequency pulse electrical signals that respectively characterize the discharge characteristics at multiple positions; based on the multiple high-frequency pulse electrical signals, determine whether the discharge position of the discharge source is located inside the transformer; when the discharge position is located inside the transformer, collect ultrasonic signals, and adopt a three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source.

[0076] Optionally, the processor may also execute program code of the following steps: based on multiple high-frequency pulse electrical signals, determining whether the discharge position of the discharge source is located inside the transformer, including: determining the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals; matching the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals with the pulse polarity, spectrum energy distribution and propagation path corresponding to the discharge at multiple predetermined discharge positions, and determining the discharge position of the discharge source among the multiple predetermined discharge positions; determining whether the discharge position of the discharge source is located inside the transformer.

[0077] Optionally, the processor may also execute program codes of the following steps: the plurality of locations include a high voltage outlet line, a neutral point, a casing and an iron core.

[0078] Optionally, the processor may also execute program code of the following steps: multiple predetermined discharge positions include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer; wherein, the first wave polarity of the time domain first wave of the transformer external discharge interference signals at each detection end is the same, and the spectrum energy is concentrated in the low frequency; the first wave polarity of the transformer winding main insulation discharge winding head end, neutral point and shell detection signal is opposite, and the first wave polarity of the transformer winding longitudinal insulation discharge winding head end and neutral point detection signal is opposite; the first wave polarity of the transformer internal non-winding discharge detection end signals is the same, and the spectrum energy is concentrated in the high frequency.

[0079] Optionally, the processor may also execute program codes of the following steps: when the discharge position is located inside the transformer, collecting ultrasonic signals, and using a three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source, including: when the discharge position is located inside the transformer, triggering a synchronous acquisition signal based on any one of the multiple high-frequency pulse electrical signals; acquiring an ultrasonic signal based on the synchronous acquisition signal; and using a spatial grid search positioning algorithm included in the three-dimensional spatial positioning strategy to combine multiple high-frequency pulse electrical signals and ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source.

[0080] The embodiment of the present invention provides a solution for locating a discharge source. By acquiring multiple high-frequency pulse electrical signals that respectively characterize discharge characteristics at multiple positions; judging whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; when the discharge position is located inside the transformer, collecting ultrasonic signals, and adopting a three-dimensional spatial positioning strategy, combining multiple high-frequency pulse electrical signals and ultrasonic signals, determining the spatial three-dimensional coordinates of the discharge source, the partial discharge phenomenon inside the transformer can be effectively identified, and the partial discharge can be accurately located in three dimensions, thereby achieving the technical effect of efficiently and accurately performing transformer detection, and further solving the technical problem of low efficiency in transformer partial discharge detection and positioning.

[0081] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0082] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the discharge source locating method provided in the above embodiment.

[0083] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: obtaining multiple high-frequency pulse electrical signals that respectively characterize discharge characteristics at multiple positions; judging whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; when the discharge position is located inside the transformer, collecting ultrasonic signals, and adopting a three-dimensional spatial positioning strategy, combining the multiple high-frequency pulse electrical signals and the ultrasonic signals, to determine the spatial three-dimensional coordinates of the discharge source.

[0085] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: based on multiple high-frequency pulse electrical signals, determining whether the discharge position of the discharge source is located inside the transformer, including: determining the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals; matching the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals with the pulse polarity, spectrum energy distribution and propagation path corresponding to the discharge at multiple predetermined discharge positions, and determining the discharge position of the discharge source among the multiple predetermined discharge positions; determining whether the discharge position of the discharge source is located inside the transformer.

[0086] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: the plurality of locations include a high voltage outlet line, a neutral point, a housing, and an iron core.

[0087] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: multiple predetermined discharge locations include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer; wherein, the first wave polarity of the time domain first wave of the transformer external discharge interference detection end signals is the same, and the spectrum energy is concentrated in the low frequency; the first wave polarity of the transformer winding main insulation discharge winding head end, neutral point and shell detection signal is opposite, and the first wave polarity of the transformer winding longitudinal insulation discharge winding head end and neutral point detection signal is opposite; the first wave polarity of the transformer internal non-winding discharge detection end signals is the same, and the spectrum energy is concentrated in the high frequency.

[0088] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: when the discharge position is located inside the transformer, collecting ultrasonic signals, and using a three-dimensional spatial positioning strategy, combining multiple high-frequency pulse electrical signals and ultrasonic signals, to determine the spatial three-dimensional coordinates of the discharge source, including: when the discharge position is located inside the transformer, based on any one of the multiple high-frequency pulse electrical signals, triggering a synchronous acquisition signal; collecting an ultrasonic signal based on the synchronous acquisition signal; and using a spatial grid search positioning algorithm included in the three-dimensional spatial positioning strategy, combining multiple high-frequency pulse electrical signals and ultrasonic signals, to determine the spatial three-dimensional coordinates of the discharge source.

[0089] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the discharge source locating method in each embodiment of the present application.

[0090] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0091] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, 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 units or modules, which can be electrical or other forms.

[0093] 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 units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0094] 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.

[0095] 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 non-volatile storage medium. Based on this understanding, the technical solution of the present invention, 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 storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for locating a discharge source, characterized in that: include: Acquire a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions; Based on the multiple high-frequency pulse electrical signals, determining whether the discharge position of the discharge source is located inside the transformer; When the discharge position is located inside the transformer, ultrasonic signals are collected, and a three-dimensional spatial positioning strategy is adopted to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the three-dimensional spatial coordinates of the discharge source.

2. The method according to claim 1, characterized in that The determining, based on the multiple high-frequency pulse electrical signals, whether the discharge position of the discharge source is located inside the transformer comprises: Determining the pulse polarity, spectrum energy distribution and propagation path of the multiple high-frequency pulse electrical signals; Matching the pulse polarities, spectrum energy distribution and propagation paths of the multiple high-frequency pulse electrical signals with the pulse polarities, spectrum energy distribution and propagation paths corresponding to discharges at multiple predetermined discharge positions, and determining the discharge position of the discharge source among the multiple predetermined discharge positions; Determine whether the discharge position of the discharge source is located inside the transformer.

3. The method according to claim 2, characterized in that The plurality of locations include a high voltage outlet line, a neutral point, a casing and an iron core.

4. The method according to claim 3, characterized in that The multiple predetermined discharge positions include the outside of the transformer, the main insulation of the transformer winding, the longitudinal insulation of the transformer winding and the non-winding inside the transformer; wherein, the first wave polarity of the time domain first wave of the signals of each detection end of the transformer external discharge interference is the same, and the spectrum energy is concentrated in the low frequency; the first wave polarity of the transformer winding main insulation discharge winding head end, neutral point and shell detection signal is opposite, and the first wave polarity of the transformer winding longitudinal insulation discharge winding head end and neutral point detection signal is opposite; the first wave polarity of the time domain first wave of the transformer internal non-winding discharge detection end signals is the same, and the spectrum energy is concentrated in the high frequency.

5. The method according to any one of claims 1 to 4, characterized in that: When the discharge position is located inside the transformer, collecting ultrasonic signals, and adopting a three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the three-dimensional spatial coordinates of the discharge source include: When the discharge position is located inside the transformer, triggering a synchronous acquisition signal based on any one of the multiple high-frequency pulse electrical signals; Acquire an ultrasonic signal according to the synchronous acquisition signal; The spatial grid search positioning algorithm included in the three-dimensional spatial positioning strategy is used to combine the multiple high-frequency pulse electrical signals and the ultrasonic signal to determine the spatial three-dimensional coordinates of the discharge source.

6. A discharge source positioning device, characterized in that: include: An acquisition module, used to acquire a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions; A judgment module, used for judging whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; The positioning module is used to collect ultrasonic signals when the discharge position is located inside the transformer, and adopt a three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the three-dimensional spatial coordinates of the discharge source.

7. A discharge source location system, characterized in that: include: A high-frequency current system for collecting a plurality of high-frequency pulse electrical signals respectively representing discharge characteristics at a plurality of positions; A positioning device, used to obtain the multiple high-frequency pulse electrical signals; It is also used to determine whether the discharge position of the discharge source is located inside the transformer based on the multiple high-frequency pulse electrical signals; it is also used to collect ultrasonic signals when the discharge position is located inside the transformer, and adopt a three-dimensional spatial positioning strategy to combine the multiple high-frequency pulse electrical signals and the ultrasonic signals to determine the spatial three-dimensional coordinates of the discharge source; The ultrasonic system is used to collect the ultrasonic signal.

8. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the discharge source locating method according to any one of claims 1 to 5.

9. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is run, the processor executes the discharge source locating method according to any one of claims 1 to 5.

10. A computer program product comprising computer instructions, characterized in that The computer instructions are executed by a processor to implement the discharge source location method according to any one of claims 1 to 5.

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