Interference source positioning method, system and gateway device for partial discharge of power equipment

Abstract

The present invention provides a method, system and gateway device for locating interference sources of partial discharge of power equipment. For each ultrasonic acquisition unit, the collected external ultrasonic signals are arranged in time series to obtain an external ultrasonic spectrum; according to the first phase of the first signal point with the highest amplitude obtained from the specified external ultrasonic spectrum, the second signal point with the highest amplitude is selected from each other external ultrasonic spectrum, and multiple hyperbolas are generated in combination with the first signal point to locate the interference source. This method can improve the accuracy of interference source positioning, facilitate users to eliminate false alarms caused by interference sources, improve the accuracy and reliability of monitoring, facilitate the safe and stable operation of the power system, and reduce the waste of human resources.

Description

Technical Field

[0001] The present invention relates to the technical field of power system fault identification, and in particular to a method, system and gateway device for locating interference sources of partial discharge of power equipment. Background Art

[0002] Partial discharge refers to the breakdown discharge phenomenon that occurs in a local area when the insulator of power equipment is subjected to a sufficiently strong electric field. This form of discharge only causes a local short circuit of the insulation between conductors, and does not form a continuous conductive channel. Each partial discharge will have a certain impact on the insulating medium. Slight partial discharge has little effect on the insulation performance of power equipment, resulting in a relatively slow decrease in insulation strength; while strong partial discharge will quickly reduce the insulation strength, which is one of the important factors that cause insulation damage to high-voltage power equipment. Live detection technology is widely regarded as an effective means to identify hidden dangers in the operation of high-voltage power equipment. With the acceleration of urbanization, the number of power facilities has also increased exponentially, and traditional manual inspection methods have become increasingly difficult to maintain their effectiveness. Although more and more power facilities have begun to use online monitoring equipment, due to interference from signals such as electric lights, motors, and radars, online monitoring equipment frequently reports false alarms, which not only affects the accuracy and reliability of monitoring, but is also not conducive to the safe and stable operation of the power system, and also causes a huge waste of human resources. Summary of the invention

[0003] The purpose of the present invention is to provide a method, system and gateway device for locating interference sources of partial discharge of power equipment, so as to accurately locate the interference sources, facilitate users to eliminate false alarms caused by the interference sources, thereby improving the accuracy and reliability of online monitoring and reducing the waste of human resources.

[0004] The present invention provides a method for locating interference sources of partial discharge of electric equipment. The method is applied to a gateway device, the gateway device is communicatively connected with at least three ultrasonic acquisition units, and each ultrasonic acquisition unit is installed on the outer surface of the electric equipment; the method comprises: for each ultrasonic acquisition unit, periodically acquiring external ultrasonic signals of the external environment of the electric equipment through the ultrasonic acquisition unit; arranging the external ultrasonic signals of multiple periods in a time series to obtain an external ultrasonic spectrum corresponding to the ultrasonic acquisition unit; if there is a signal point with an amplitude exceeding a preset threshold in the external ultrasonic spectrum corresponding to the specified ultrasonic acquisition unit, then obtaining the first signal point with the highest amplitude and its corresponding first phase from the external ultrasonic spectrum corresponding to the specified ultrasonic acquisition unit; based on the first phase, respectively selecting the second signal point with the highest amplitude from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, the first ultrasonic acquisition unit being other ultrasonic acquisition units except the specified ultrasonic acquisition unit; based on the first signal point and each second signal point, generating a hyperbola representing the trajectory of the interference source corresponding to each first ultrasonic acquisition unit; based on the hyperbola, locating the target position of the interference source.

[0005] Furthermore, based on the first phase, the step of selecting the second signal point with the highest amplitude from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit includes: from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, based on the first phase and according to the preset phase range, determining the target phase interval corresponding to each first ultrasonic acquisition unit; and selecting the second phase point with the highest amplitude from each target phase interval.

[0006] Furthermore, based on the first signal point and each second signal point, the step of generating a hyperbola representing the trajectory of the interference source corresponding to each first ultrasonic acquisition unit includes: obtaining the second phase corresponding to each second signal point; calculating the phase difference between each second signal point and the first signal point according to each second phase and the first phase; for each first ultrasonic acquisition unit, generating a hyperbola representing the trajectory of the interference source corresponding to the first ultrasonic acquisition unit according to the specified position information of the specified ultrasonic acquisition unit, the phase difference corresponding to the first ultrasonic acquisition unit, and the first position information.

[0007] Furthermore, the step of locating the target position of the interference source based on the hyperbola includes: clustering the intersection points of each two groups of hyperbolas through a clustering algorithm to obtain the target points corresponding to the intersection points; and locating the target position of the interference source based on the position of the target points.

[0008] Furthermore, the step of locating the target position of the interference source based on the position of the target point includes: determining the target area based on the position of the target point; and determining the target position of the interference source based on the center position of the target area.

[0009] Furthermore, each ultrasound acquisition unit and gateway device uses an ultra-wideband method to maintain time synchronization.

[0010] The present invention provides a system for locating interference sources of partial discharge of electric equipment, and the system includes: at least three ultrasonic acquisition units, a gateway device and a cloud platform; each ultrasonic acquisition unit is used to periodically collect external ultrasonic signals of the external environment of the electric equipment, and send multiple cycles of external ultrasonic signals to the gateway device; the gateway device is used to adopt any of the interference source locating methods mentioned above to obtain the external ultrasonic spectrum corresponding to each ultrasonic acquisition unit, and based on each external ultrasonic spectrum, locate the target position of the interference source, and send each external ultrasonic spectrum and the target position to the cloud platform; the cloud platform is used to send each external ultrasonic spectrum to a pre-trained recognition model to output the interference type of the interference source through the recognition model; and generate an alarm message based on the target position and the interference type to prompt the user to eliminate the interference source.

[0011] Furthermore, each ultrasonic acquisition unit has an inner probe and an outer probe; the inner probe is used to acquire internal ultrasonic signals inside the corresponding power equipment; the outer probe is used to acquire external ultrasonic signals of the external environment of the corresponding power equipment.

[0012] Furthermore, the gateway device is also used to: determine whether there are signal points with amplitudes exceeding a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit; determine whether there is local discharge in the corresponding power equipment based on the internal ultrasonic signals collected by each internal probe; if there are signal points with amplitudes exceeding the preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and there is no local discharge in the corresponding power equipment, locate the target position of the interference source based on each external ultrasonic spectrum; if there are signal points with amplitudes exceeding the preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and there is local discharge in the corresponding power equipment, delete the signal points within the preset range of the designated phase from the corresponding internal ultrasonic spectrum generated based on the internal ultrasonic signal according to the designated phase of the signal point with the highest amplitude in each external ultrasonic spectrum, so as to continue to determine whether there is local discharge in the corresponding power equipment based on the remaining signal points in the internal ultrasonic spectrum.

[0013] A gateway device provided by the present invention includes a processor and a memory, wherein the memory stores machine executable instructions that can be executed by the processor, and the processor executes the machine executable instructions to implement any of the above-mentioned methods for locating interference sources of partial discharge of power equipment.

[0014] The interference source positioning method, system and gateway device of partial discharge of power equipment provided by the present invention, for each ultrasonic acquisition unit, the external ultrasonic signal of the external environment of the power equipment is periodically collected by the ultrasonic acquisition unit; the external ultrasonic signals of multiple cycles are arranged in time series to obtain the external ultrasonic spectrum corresponding to the ultrasonic acquisition unit; if there is a signal point with an amplitude exceeding a preset threshold in the external ultrasonic spectrum corresponding to the specified ultrasonic acquisition unit, the first signal point with the highest amplitude and its corresponding first phase are obtained from the external ultrasonic spectrum corresponding to the specified ultrasonic acquisition unit; based on the first phase, the second signal point with the highest amplitude is selected from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, and the first ultrasonic acquisition unit is other ultrasonic acquisition units except the specified ultrasonic acquisition unit; based on the first signal point and each second signal point, a hyperbola representing the trajectory of the interference source corresponding to each first ultrasonic acquisition unit is generated; based on the hyperbola, the target position of the interference source is located. This method can improve the accuracy of interference source positioning, facilitate users to eliminate false alarms caused by interference sources, improve the accuracy and reliability of monitoring, is conducive to the safe and stable operation of the power system, and reduces the waste of human resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A flow chart of a method for locating interference sources of partial discharge of electric power equipment provided by an embodiment of the present invention;

[0017] Figure 2 A flow chart of a synchronization method provided by an embodiment of the present invention;

[0018] FIG3 (a) is a schematic diagram of an ultrasonic spectrum provided by an embodiment of the present invention;

[0019] FIG3( b ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0020] FIG3 (c) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0021] FIG3( d ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0022] FIG3( e ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0023] FIG3( f) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0024] FIG3( g) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0025] FIG3( h) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0026] FIG4 (a) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0027] FIG4( b ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0028] FIG4( c ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0029] FIG4( d ) is a schematic diagram of another ultrasonic spectrum provided by an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of multiple groups of hyperbolas provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a dual-probe acquisition unit provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a system for locating interference sources of partial discharge of electric power equipment provided by an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of a positioning effect provided by an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of the structure of a gateway device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The power system is the lifeline of the smooth operation of the national economy. Safety, stability and reliability are the basic requirements of the power system. The destructive effects of partial discharge on power equipment are mainly concentrated in:

[0037] 1) The high-speed impact of high-temperature charged particles (mainly electrons) causes irreversible damage to the insulation (destroying its molecular structure, such as breaking fibers), destroying the insulation effect.

[0038] 2) As the discharge progresses, chemically active products are easily generated inside the GIS (GAS INSULATED SWITCHGEAR) equipment, such as ozone (O 3 ) or nitrogen oxides (NO, NO 2 ) etc. These chemicals can easily corrode the insulation. What's worse, they will be reduced to nitric acid when in contact with water, which will corrode the insulation more severely.

[0039] 3) The shock waves and radiation generated during the partial discharge process change the structure of the material, destroy the polymer and generate free radicals, thereby destroying the insulation.

[0040] 4) During partial discharge, the oil in the electrical equipment will decompose due to electrolysis and the Schottky radiation effect of the electrode. If there are impurities in the oil, sludge will easily form, which will reduce the heat dissipation capacity of the electrical equipment and may cause thermal breakdown in severe cases.

[0041] 5) Under the irradiation of X-rays and ultraviolet rays generated during local discharge, molecules are easily broken down to form electrical corrosion.

[0042] Under the combined effect of the above factors, the continued development of partial discharge will aggravate the degree of insulation damage, reduce insulation strength, and may even cause the entire insulation to be broken down by discharge, resulting in serious accidents and huge economic losses.

[0043] Live detection technology is considered to be an effective means of discovering hidden dangers in the operation of high-voltage power equipment. Currently, with the exponential growth in the number of power facilities, it has become increasingly difficult for traditional manual inspection methods to maintain their effectiveness. Although more and more power facilities have adopted online monitoring equipment, due to interference from signals such as electric lights, motors, and radars, online monitoring equipment frequently gives false alarms, resulting in inspectors' distrust of online monitoring equipment and a tendency to use traditional inspection methods. This not only wastes human resources, but also makes the promotion of new technologies difficult. Based on this, an embodiment of the present invention provides a method, system, and gateway device for locating interference sources of partial discharge of power equipment. The technology can be applied to scenarios where it is necessary to locate and identify interference sources of partial discharge of power equipment.

[0044] To facilitate understanding of the present embodiment, a method for locating interference sources of partial discharge of electric power equipment disclosed in an embodiment of the present invention is first introduced. The method is applied to a gateway device, and the gateway device is communicatively connected to at least three ultrasonic acquisition units, each of which is installed on the outer surface of the electric power equipment; the electric power equipment may include switch cabinets, distribution cabinets and other power-related equipment; in actual implementation, an ultrasonic acquisition unit may be installed on the outer surface of each electric power equipment, and at least three electric power equipment need to be included in this application scenario; multiple ultrasonic acquisition units may also be installed on the outer surface of each electric power equipment. For example, if there is only one electric power equipment, three ultrasonic acquisition units may be installed on the outer surface of the electric power equipment; if there are two electric power equipment, one ultrasonic acquisition unit may be installed on the outer surface of one electric power equipment, and two ultrasonic acquisition units may be installed on the outer surface of the other electric power equipment. The specific settings can be made according to actual needs and are not limited here; it should be noted that if there are multiple electric power equipment, each ultrasonic acquisition unit is usually installed on the outer surface of the same side of each electric power equipment; Figure 1 As shown, the method comprises the following steps:

[0045] Step S102: for each ultrasonic collection unit, the external ultrasonic signal of the external environment of the electric power equipment is periodically collected by the ultrasonic collection unit.

[0046] The above-mentioned external environment usually refers to the place where the power equipment is located, such as a switch room, etc.; the above-mentioned period can be understood as the period for collecting external ultrasonic signals, which can be set according to actual needs, such as 1s, etc. In actual implementation, the external ultrasonic signal of the external environment of the power equipment can be collected by each ultrasonic collection unit. In order to ensure the accuracy of locating the interference source, multiple periods of external ultrasonic signals are usually collected; usually the actual operating frequency of the ultrasonic collection unit is very high, and the number of collected signal points is large. Therefore, in a time period of 1s, it can continuously collect 280us, and then output a maximum point collected in the time period of 280us, so that about 3600 signal points will be output in a time period of 1s.

[0047] Step S104, arranging the external ultrasonic signals of multiple cycles in time series to obtain the external ultrasonic spectrum corresponding to the ultrasonic acquisition unit.

[0048] In actual implementation, the external ultrasonic signals of multiple cycles collected by each ultrasonic collection unit can be flattened on the time axis according to the time sequence of collection, so as to obtain the external ultrasonic spectrum corresponding to each ultrasonic collection unit.

[0049] Step S106: if there is a signal point with an amplitude exceeding a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, a first signal point with the highest amplitude and its corresponding first phase are obtained from the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit.

[0050] The above-mentioned designated ultrasonic acquisition unit may be an ultrasonic acquisition unit whose actual physical position is located in the middle of a plurality of ultrasonic acquisition units. For example, if there are three ultrasonic acquisition units A, B, and C arranged in sequence, and the physical position of B is located between A and C, then B may be used as the designated ultrasonic acquisition unit; the above-mentioned preset threshold may be set according to actual needs. In actual implementation, if there is a signal point whose amplitude exceeds the preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, it can generally be considered that there is an interference source in the external environment, and the higher the amplitude, the greater the probability of the existence of an interference source; at this time, the first signal point with the highest amplitude may be identified from the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and the first phase corresponding to the first signal point may be obtained.

[0051] Step S108, based on the first phase, select the second signal point with the highest amplitude from the external ultrasonic spectrum corresponding to each ultrasonic acquisition unit except the designated ultrasonic acquisition unit. For ease of description, each ultrasonic acquisition unit except the designated ultrasonic acquisition unit is hereinafter referred to as the first ultrasonic acquisition unit.

[0052] In actual implementation, after acquiring the above-mentioned first phase, the second signal point with the highest amplitude near the first phase can be searched with the first phase as the center in the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, for example, the second phase point with the highest amplitude can be searched within the phase interval corresponding to ±10ms of the first phase. The specific phase interval can be set according to actual needs.

[0053] Step S110 , based on the first signal point and each second signal point, a hyperbola representing the trajectory of the interference source corresponding to each first ultrasonic acquisition unit is generated, so as to locate the target position of the interference source based on the generated hyperbola.

[0054] A hyperbola is a set of points in a plane whose distance difference to two fixed points is a constant. After selecting each second signal point, a set of hyperbolas corresponding to each first ultrasonic acquisition unit can be drawn in combination with the characteristics of the first signal point and the hyperbola. Each set of hyperbolas represents the trajectory of the interference source calculated based on the corresponding first ultrasonic acquisition unit and the specified ultrasonic acquisition unit. Therefore, based on the hyperbola, the target position of the interference source can be located.

[0055] The above-mentioned interference source positioning method for partial discharge of electric power equipment, for each ultrasonic acquisition unit, periodically collects multiple periods of external ultrasonic signals in the external environment of the electric power equipment through the ultrasonic acquisition unit; arranges the multiple periods of external ultrasonic signals in a time series to obtain an external ultrasonic spectrum corresponding to the ultrasonic acquisition unit; if there is a signal point with an amplitude exceeding a preset threshold in the external ultrasonic spectrum corresponding to the specified ultrasonic acquisition unit, then obtain the first signal point with the highest amplitude and its corresponding first phase from the external ultrasonic spectrum; based on the first phase, select the second signal point with the highest amplitude from the external ultrasonic spectrum corresponding to each ultrasonic acquisition unit (i.e., the first ultrasonic acquisition unit) except the specified ultrasonic acquisition unit; based on the first signal point and each second signal point, generate a hyperbola representing the trajectory of the interference source corresponding to each first ultrasonic acquisition unit, so as to locate the target position of the interference source based on the hyperbola. This method helps to improve the accuracy of locating the interference source by arranging multiple cycles of external ultrasonic signals in a time series, and generates a hyperbola based on the first phase point corresponding to the designated ultrasonic acquisition unit and the second phase point corresponding to each first ultrasonic acquisition unit, so as to locate the target position of the interference source, which can further improve the accuracy of locating the interference source, facilitate users to eliminate false alarms caused by interference sources, improve the accuracy and reliability of monitoring, is conducive to the safe and stable operation of the power system, and reduces the waste of human resources.

[0056] The embodiment of the present invention also provides another method for locating interference sources of partial discharge of power equipment. The method is implemented on the basis of the method of the above embodiment. In the method, each ultrasonic acquisition unit and gateway device adopts ultra-wideband (Ultra Wide Band, UWB) to maintain time synchronization. UWB is a wireless carrier communication technology. It does not use a sinusoidal carrier, but uses nanosecond non-sinusoidal narrow pulses to transmit data, so it occupies a wide spectrum range. UWB technology has the advantages of low system complexity, low power spectrum density of transmitted signals, insensitivity to channel fading, low interception capability, and high positioning accuracy. This embodiment adopts the UWB wireless high-precision synchronization method for the first time in the power field, abandoning the traditional wired or low-precision wireless method, and greatly improving the positioning accuracy of the interference source.

[0057] In one embodiment, a wireless communication chip with a bandwidth of 3.5 GHz to 6.5 GHz (the chip is only responsible for recording the timestamp of sending / receiving data packets) can be used to reduce the clock error to 10 by using a bilateral two-way ranging method. -9 The wireless communication chip can realize wireless high-precision clock synchronization and data transmission of the ultrasonic acquisition unit.

[0058] The following is an explanation of the wireless high-precision positioning synchronization method using UWB wireless bilateral two-way ranging. Figure 2 A synchronization method flow chart is shown, which shows the method of wireless high-precision positioning synchronization using UWB wireless bilateral two-way ranging. Device A and Device B in the figure represent the ultrasonic acquisition unit and the gateway device respectively. When performing wireless high-precision synchronization, the gateway device and each ultrasonic acquisition unit are synchronized separately. The purpose of synchronization is to ensure that the time of the gateway device and each ultrasonic acquisition unit is the same, so that when collecting data, all ultrasonic acquisition units can be guaranteed to start collecting at the same time, thereby ensuring the consistency of the phase of the obtained ultrasonic spectrum.

[0059] Figure 2 In the example, Device A first sends a data packet to Device B, that is, it performs the operation TX (Transmit) to send a signal and records the time of sending the packet. Device B performs the operation RX (Receive) to receive the signal. After receiving the data packet, it records the time of receiving the packet (RMARKER). Then Device B waits for T reply1 , sends a data packet to Device A, that is, performs the operation of sending signals TX (Transmit), and Device A performs the operation of receiving signals RX (Receive), records the time of receiving the data packet after receiving the data packet, and then waits T reply2 Send a data packet to Device B, that is, perform the signal transmission operation TX (Transmit), and Device B performs the signal reception operation RX (Receive), and records the time when the data is received.

[0060] The time difference between two devices can be calculated using the following formula:

[0061] ;

[0062] in, Indicates the time from when Device A sends a data packet to when it receives the data packet sent by Device B. Indicates the time from when Device A receives a data packet from Device B to when it sends a data packet to Device B. Indicates the time from when Device B receives a data packet from Device A to when it sends a data packet to Device A. Indicates the time from when Device B sends a data packet to when it receives a data packet sent by Device A; Indicates the time difference between Device A and Device B in space (the time difference is caused by the distance between the two devices in space, the distance between the two devices = speed of light × time difference)

[0063] The error value caused by the clock can be calculated by the following formula:

[0064] ;

[0065] Here, error represents the error value caused by the clock. The ratio of the actual frequency of Device A to the expected frequency. The ratio of the actual frequency of Device B to the expected frequency.

[0066] The expected frequencies of the above devices Device A and Device B can be understood as ideal frequencies. Assuming that the crystal oscillator of the device is 50 MHz, the clock frequency of 50 MHz is ideally output. In actual environments, affected by factors such as temperature, there may be a positive or negative deviation between the actual frequency and the ideal frequency.

[0067] Assume that the clock accuracy of Device A and Device B is 20ppm (very poor accuracy). and are the ratios of the actual and expected frequencies of the clocks of Device A and Device B, respectively. Then It can be 1±20ppm, It can be 1±20ppm. If the distance between Device A and Device B is 100m, and the flight time of electromagnetic waves is 333ns, the error introduced by the clock is 6.7×10 -12 Second.

[0068] In actual use, the gateway device is used to synchronize with each ultrasonic acquisition unit. First, the time difference between each ultrasonic acquisition unit and the gateway device is obtained, and then the clock of the ultrasonic acquisition unit is set according to the calculated error value, so as to keep the clock of the ultrasonic acquisition unit consistent with the clock of the gateway device, so as to achieve the purpose of time synchronization. By setting the ultrasonic acquisition unit to periodically collect data and then send it to the gateway device for periodic time synchronization, it is ensured that each ultrasonic acquisition unit and the gateway device maintain time synchronization, so that the data collected for the same interference signal is more accurate, thereby improving the positioning accuracy of the interference source.

[0069] The interference source location method of partial discharge of electric power equipment in this embodiment includes the following steps:

[0070] Step 1: for each ultrasonic collection unit, the external ultrasonic signal of the external environment of the electric power equipment is periodically collected by the ultrasonic collection unit.

[0071] Step 2: Arrange the external ultrasonic signals of multiple cycles in time series to obtain the external ultrasonic spectrum corresponding to the ultrasonic acquisition unit.

[0072] Step three: if there is a signal point whose amplitude exceeds a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, the first signal point with the highest amplitude and its corresponding first phase are obtained from the designated external ultrasonic spectrum.

[0073] Step 4: From the external ultrasonic spectrum corresponding to each ultrasonic acquisition unit (i.e., each first ultrasonic acquisition unit) except the designated ultrasonic acquisition unit, the target phase interval corresponding to each first ultrasonic acquisition unit is determined based on the first phase and the preset phase range.

[0074] The above-mentioned preset phase range can be set according to actual needs, generally not exceeding one cycle. For example, at the AC frequency corresponding to 50 Hz, the cycle is 1 / 50=20ms, then the preset phase range can be ±10ms, and the target phase interval can be: first phase ±10ms, etc.; in actual implementation, after determining the first phase, the target phase interval corresponding to each first ultrasonic acquisition unit can be determined according to the preset phase range, with the first phase as the center, in the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit.

[0075] Step 5: Select the second signal point with the highest amplitude from each target phase interval.

[0076] Step six, obtaining the second phase corresponding to each second signal point.

[0077] In actual implementation, due to the different actual physical positions of different first ultrasonic acquisition units, the time when the same interference source reaches each first ultrasonic acquisition unit is usually different, so the second phase corresponding to the second signal point with the highest amplitude corresponding to each first ultrasonic acquisition unit is usually different. By selecting according to the target phase interval, the accuracy of obtaining the second signal point with the highest amplitude can be improved.

[0078] Step seven: Calculate the phase difference between each second signal point and the first signal point according to each second phase and the first phase.

[0079] After obtaining the second phase corresponding to each second signal point, the difference between the second phase corresponding to the second signal point and the first phase can be calculated for each second signal point to determine the phase difference between the second signal point and the first signal point. The phase difference obtained in this way has a high accuracy and can greatly improve the positioning accuracy of the interference source.

[0080] The traditional phase difference acquisition process is as follows: the collected ultrasonic signals of multiple cycles (such as 50 cycles) are plotted on one cycle to form an ultrasonic spectrum, and then the characteristics are found by observing the ultrasonic spectrum of each ultrasonic acquisition unit, and finally the phase difference is measured based on the characteristics.

[0081] Taking four ultrasonic acquisition units, and the ultrasonic acquisition units are dual-probe acquisition units as an example, a schematic diagram of an ultrasonic spectrum is shown in Figure 3 (a), which is specifically an internal ultrasonic spectrum acquired by the internal probe of the first ultrasonic acquisition unit. In this figure, the horizontal axis represents the phase information of the internal ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200400, in degrees (°), and the vertical axis represents the amplitude, in dBμV; as shown in Figure 3 (b), another schematic diagram of an ultrasonic spectrum is shown, which is specifically an external ultrasonic spectrum acquired by the external probe of the first ultrasonic acquisition unit. In this figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200400, in degrees (°), and the vertical axis represents the amplitude, in dBμV.

[0082] FIG3 (c) is a schematic diagram of another ultrasonic spectrum, which is specifically an internal ultrasonic spectrum collected by the internal probe of the second ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the internal ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200401, in degrees (°), and the vertical axis represents the amplitude, in dBμV; FIG3 (d) is a schematic diagram of another ultrasonic spectrum, which is specifically an external ultrasonic spectrum collected by the external probe of the second ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200401, in degrees (°), and the vertical axis represents the amplitude, in dBμV.

[0083] FIG3 (e) is a schematic diagram of another ultrasonic spectrum, which is specifically an internal ultrasonic spectrum collected by the internal probe of the third ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the internal ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200402, in degrees (°), and the vertical axis represents the amplitude, in dBμV; FIG3 (f) is a schematic diagram of another ultrasonic spectrum, which is specifically an external ultrasonic spectrum collected by the external probe of the third ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200402, in degrees (°), and the vertical axis represents the amplitude, in dBμV.

[0084] FIG3 (g) is a schematic diagram of another ultrasonic spectrum, which is specifically an internal ultrasonic spectrum collected by the internal probe of the fourth ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the internal ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200403, in degrees (°), and the vertical axis represents the amplitude, in dBμV; FIG3 (h) is a schematic diagram of another ultrasonic spectrum, which is specifically an external ultrasonic spectrum collected by the external probe of the fourth ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a08200403, in degrees (°), and the vertical axis represents the amplitude, in dBμV.

[0085] The traditional calculation method first needs to find a certain feature on an ultrasonic spectrum, then use this feature to find this feature in other ultrasonic spectra, and then calculate the phase of these two features to get the time difference of the same signal reaching the two ultrasonic acquisition units. However, in practice, this feature is not easy to find. Even if it is found, it is quite difficult to find this feature in other ultrasonic acquisition units, and the error is large. It is quite difficult to find the feature manually or to calculate it automatically through algorithms, which leads to large errors in traditional phase difference calculation.

[0086] The method for calculating the phase difference adopted in this embodiment is to sequentially flatten the ultrasonic signals of multiple cycles (such as 50 cycles) onto the time axis, and then search for the same features near the same phase in the spectra of other ultrasonic acquisition units (i.e., the first ultrasonic acquisition unit) according to the spectrum features of the specified ultrasonic acquisition unit, so that the phase difference of each ultrasonic acquisition unit can be calculated with high precision. The method for calculating the phase difference provided in this embodiment is easier to implement in practice and easier to perform automatic calculation through program algorithms.

[0087] Continuing with the example of four ultrasonic acquisition units, and the ultrasonic acquisition units being dual-probe acquisition units, another schematic diagram of an ultrasonic spectrum is shown in FIG4 (a), which is specifically an external ultrasonic spectrum acquired by an external probe of the first ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a082007e5, in degrees (°), and the vertical axis represents the amplitude, in dBμV; another schematic diagram of an ultrasonic spectrum is shown in FIG4 (b), which is specifically an external ultrasonic spectrum acquired by an external probe of the second ultrasonic acquisition unit. In the figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a082007de, in degrees (°), and the vertical axis represents the amplitude, in dBμV. The coordinates represent the amplitude, in dBμV; as shown in FIG4 (c), another schematic diagram of an ultrasonic spectrum is specifically an external ultrasonic spectrum collected by the external probe of the third ultrasonic acquisition unit. In this figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a082007e2, in degrees (°), and the vertical axis represents the amplitude, in dBμV; as shown in FIG4 (d), another schematic diagram of an ultrasonic spectrum is specifically an external ultrasonic spectrum collected by the external probe of the fourth ultrasonic acquisition unit. In this figure, the horizontal axis represents the phase information of the external ultrasonic signal of the ultrasonic acquisition unit numbered c35a082007e4, in degrees (°), and the vertical axis represents the amplitude, in dBμV. The ultrasonic signals of multiple cycles can be flattened on the time axis. In this case, it is assumed that for the same interference behavior, the point with the strongest energy is also the point with the largest amplitude on each ultrasonic spectrum. By widening these four spectra to several cycles and then checking the features, it can be seen that the features are relatively obvious and the data are arranged in a regular pattern.

[0088] Step eight: for each first ultrasonic acquisition unit, a hyperbola representing the interference source trajectory corresponding to the first ultrasonic acquisition unit is generated according to the designated position information of the designated ultrasonic acquisition unit, the phase difference corresponding to the first ultrasonic acquisition unit, and the first position information.

[0089] The above-mentioned designated position information can be understood as information representing the actual physical position of the designated ultrasonic acquisition unit; the above-mentioned first position information can be understood as information representing the actual physical position of the first ultrasonic acquisition unit; in actual implementation, for each first ultrasonic acquisition unit, the designated position information of the designated ultrasonic acquisition unit and the first position information of the first ultrasonic acquisition unit can be used as two fixed points (i.e., two foci of a hyperbola), and the phase difference corresponding to the first ultrasonic acquisition unit is multiplied by the speed at which the ultrasonic signal is transmitted in the air to obtain the distance difference (i.e., the absolute value of the difference in distance from the two foci in the plane is equal to the distance difference), and the hyperbola corresponding to each first ultrasonic acquisition unit is drawn.

[0090] Step nine: cluster the intersection points of each pair of hyperbolas using a clustering algorithm to obtain the target points corresponding to the intersection points.

[0091] Step 10: Based on the position of the target point, locate the target position of the interference source.

[0092] The above clustering algorithm can adopt the k-means clustering algorithm, which is an iterative clustering analysis algorithm. After drawing multiple sets of hyperbolas, the positions corresponding to the points where the multiple sets of hyperbolas intersect are the possible interference source positions. For example, see Figure 5 A schematic diagram of multiple groups of hyperbolas is shown, in which points A, B, C, and D are the installation positions of the ultrasonic acquisition unit. In actual scenarios, points A, B, and C can be the installation positions on power equipment such as switch cabinets, such as installing the ultrasonic acquisition unit on the surface of the switch cabinet; point D is a reference node installed on the wall of the room where the power equipment is located, such as the switch room. The reference node is used to assist in screening and determining the relative position of the interference source (such as the location of the interference source is usually located in the area surrounded by the installation positions of the four ultrasonic acquisition units A, B, C, and D). The figure can be regarded as an external environment, such as a top view of the switch room of a power station, in which the horizontal and vertical coordinates represent the length and width of the switch room respectively.

[0093] The three sets of hyperbolas in the figure are drawn based on the actual installation distances of A, B, C, and D, and the hyperbolas parameters obtained by calculating the phase difference through the ultrasonic spectrum. Point O in the figure is the intersection of the three sets of hyperbolas, corresponding to the position of the interference source in space.

[0094] From the figure, we can see the position of point O. The intersection of the hyperbola is calculated by the parametric equation of the hyperbola. In fact, it is not just one point, but an area. Since there are too many points, the reference significance is weakened. Therefore, we can first remove the obviously wrong points, and then use the k-means clustering algorithm in machine learning to cluster multiple points into one point.

[0095] Specifically, a group of points can be calculated by intersecting three groups of hyperbolas in pairs, and then this group of points can be clustered into a target point through the k-means clustering algorithm. Then, three target points can be obtained by intersecting them in pairs, and the target position of the interference source can be located based on the positions of the three target points.

[0096] Specifically, step ten can be implemented by following steps 10 and 11:

[0097] Step 10: Determine the target area based on the position of the target point.

[0098] Step 11: determine the target position of the interference source based on the center position of the target area.

[0099] The target area may be a polygonal area obtained according to the position of each target point. For example, if the number of target points is three, a triangle with the three target points as vertices may be obtained according to the positions of the three target points, and the area corresponding to the triangle is the target area. The target position of the interference source may be approximately obtained according to the center position of the target area. In actual scenarios, the target position of the interference source may be located exactly at the center position, or may be located at a position close to the center position.

[0100] The above-mentioned interference source location method of partial discharge of power equipment helps to improve the accuracy of interference source location by arranging multiple cycles of external ultrasonic signals in a time series, and generates a hyperbola based on the first phase point corresponding to the specified ultrasonic acquisition unit and the second phase point corresponding to each first ultrasonic acquisition unit, and locates the target position of the interference source, which can further improve the accuracy of interference source location, making it easier for users to eliminate false alarms caused by interference sources, thereby reducing the waste of human resources. In this method, the method of calculating the phase difference between synchronously collected ultrasonic spectra abandons the traditional manual observation method and improves the ability of automated processing.

[0101] An embodiment of the present invention provides a system for locating interference sources of partial discharge of electric power equipment. The system includes: at least three ultrasonic acquisition units, a gateway device and a cloud platform.

[0102] Each ultrasonic collection unit is used to periodically collect external ultrasonic signals from the external environment of the power equipment, and send multiple cycles of external ultrasonic signals to the gateway device.

[0103] The gateway device is used to adopt the interference source positioning method in the above embodiment to obtain the external ultrasonic spectrum corresponding to each ultrasonic acquisition unit, and based on each external ultrasonic spectrum, locate the target position of the interference source, and send each external ultrasonic spectrum and target position to the cloud platform.

[0104] The cloud platform is used to send each external ultrasonic spectrum to a pre-trained recognition model to output the interference type of the interference source through the recognition model; and generate alarm information based on the target location and interference type to prompt the user to eliminate the interference source.

[0105] The above-mentioned recognition model can be implemented through a variety of convolutional neural networks, such as residual networks, VGG networks, etc.; the above-mentioned alarm information can be implemented through voice, text, signal lights, etc.; the interference type can be understood as the type of interference source, such as mobile phones, radars, motors, electric lights, etc.; in actual implementation, after the gateway device recognizes the discharge signal or suspicious signal, it can send each external ultrasonic spectrum and target position to the cloud platform, and the cloud platform will perform AI (Artificial Intelligence) judgment, that is, the cloud platform can send each external ultrasonic spectrum to a pre-trained recognition model, output the interference type of the interference source, and then generate alarm information according to the target position and interference type, so as to notify the operation and maintenance personnel in time.

[0106] Operation and maintenance personnel or experts can make a preliminary judgment on whether an accident occurs based on the target location, interference type and related ultrasonic spectra, and assess whether on-site processing by operation and maintenance personnel is required based on the severity of the accident. For example, if the maximum amplitude gradually increases with the increase in cycle, it can be preliminarily determined that the power equipment is damaged.

[0107] After the operation and maintenance personnel handle the problem on site, they can feed back the processing results to the cloud platform. The cloud platform obtains the feedback results from the operation and maintenance personnel over a period of time, combines the query database to obtain the original data when the device reported the judgment at that time, and uses the transfer learning algorithm to retrain the recognition model to improve the generalization ability of the model, realize the continuous optimization of the recognition model, and thus improve the accuracy of locating the interference source.

[0108] The above-mentioned interference source positioning system for partial discharge of power equipment can obtain the target position of the interference source through the gateway device, output the interference type of the interference source through the cloud platform, and make a comprehensive judgment based on the target position and interference type, thereby improving the accuracy of locating the interference source and detecting the operating hazards of the power equipment.

[0109] Furthermore, each ultrasonic acquisition unit has an inner probe and an outer probe; the inner probe is used to acquire internal ultrasonic signals inside the corresponding power equipment; the outer probe is used to acquire external ultrasonic signals of the external environment of the corresponding power equipment.

[0110] In this embodiment, the ultrasonic acquisition unit may adopt a dual-probe acquisition unit, that is, it has an inner probe and an outer probe; for example, for a switch cabinet, the dual-probe acquisition unit has an inner probe for monitoring the partial discharge signal inside the cabinet and an outer probe for monitoring the signal outside the cabinet. The ultrasonic monitoring directions inside the cabinet and outside the cabinet are completely opposite. The ultrasonic signal generated by the partial discharge inside the switch cabinet is transmitted along the gap of the switch cabinet to the outside of the switch cabinet. The inner probe of the ultrasonic acquisition unit senses the partial discharge signal inside the cabinet, while the monitoring direction of the external probe is opposite to that of the inner probe, and the partial discharge signal inside the cabinet is almost not sensed. The ultrasonic signal in the space outside the cabinet is transmitted to the external probe or to the inner probe through the gap between the switch cabinet and the inner probe. The dual-probe acquisition unit synchronously collects inward ultrasonic and outward ultrasonic data. Since the time for the ultrasonic signal in the space outside the cabinet to reach the external probe and the internal probe is basically the same, the external ultrasonic interference signal can be eliminated through the algorithm to achieve accurate detection of partial discharge inside the cabinet. Figure 6 A schematic diagram of a dual-probe acquisition unit is shown, wherein the left picture is the front of the dual-probe acquisition unit, and the right picture is the back of the dual-probe acquisition unit.

[0111] like Figure 7 The schematic diagram of a local discharge interference source positioning system for power equipment is shown. The figure takes four dual-probe acquisition units as an example. The four dual-probe acquisition units are all connected to the gateway device through a wireless channel, and the gateway device is connected to the cloud platform. Each dual-probe acquisition unit is adsorbed on the surface of power equipment such as a switch cabinet by a strong magnetic adsorption method, and is connected to the gateway device through a UWB method. Each dual-probe acquisition unit may include: an ultrasonic acquisition subunit, a first data processing subunit and a wireless transceiver subunit; wherein the ultrasonic acquisition subunit includes an inner probe and an outer probe, which are respectively used to collect ultrasonic signals in the switch cabinet and the external environment; the first data processing subunit can perform analog-to-digital conversion on the collected ultrasonic signal to obtain a processed ultrasonic signal in a specified data format; the wireless transceiver subunit sends the processed ultrasonic signal to the gateway device; the inner probe of each dual-probe acquisition unit can collect the internal ultrasonic signal inside the switch cabinet, and the outer probe can collect the external ultrasonic signal outside the switch cabinet, that is, the external environment, and the inner probe and the outer probe are collected synchronously, and the collected internal ultrasonic signal and external ultrasonic signal will be sent to the gateway device. By collecting ultrasonic signals with dual probes, it is possible to locate the interference source of partial discharge of power equipment and improve the accurate monitoring of partial discharge of power equipment.

[0112] The gateway device may include: a second data processing subunit, a protocol processing subunit and a data transceiver subunit; wherein the second data processing subunit is used to receive the processed ultrasonic signal, execute the interference source positioning method in this embodiment on the processed ultrasonic signal, and obtain the target position of the interference source; the protocol processing subunit can convert the calculated target position of the interference source into the form of a specified protocol; the data transceiver subunit can forward the target position converted into the form of the specified protocol to the cloud platform.

[0113] The cloud platform can display partial discharge (PD) alarm information, display, store and export raw PD data with manual assisted evaluation, train artificial intelligence algorithms, and manage equipment.

[0114] Furthermore, the gateway device is also used to: determine whether there are signal points with amplitudes exceeding a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit; determine whether there is partial discharge in the corresponding power equipment based on the internal ultrasonic signals collected by each internal probe; if there are signal points with amplitudes exceeding the preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and there is no partial discharge in the corresponding power equipment, locate the target position of the interference source based on each external ultrasonic spectrum; if there are signal points with amplitudes exceeding the preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and there is partial discharge in the corresponding power equipment, delete the signal points within the preset range of the designated phase from the internal ultrasonic spectrum generated based on the internal ultrasonic signal of the same corresponding ultrasonic acquisition unit according to the designated phase of the signal point with the highest amplitude in each external ultrasonic spectrum, so as to continue to determine whether there is partial discharge in the corresponding power equipment based on the remaining signal points in the internal ultrasonic spectrum, thereby eliminating the influence of external interference on the ultrasonic signal collected by the internal ultrasonic probe, and based on the remaining signal points in the internal ultrasonic spectrum, it is possible to more accurately determine whether there is actual partial discharge in the power equipment.

[0115] In actual implementation, it is possible to first determine whether there is external interference based on the external ultrasonic signal. Specifically, it is possible to determine whether there is a signal point in the external ultrasonic spectrum whose amplitude exceeds a preset threshold. If so, it can be considered that there is external interference.

[0116] If there is external interference and there is no partial discharge in the power equipment, the location calculation of the interference source can be performed in the manner described in the foregoing embodiment, and the located target position of the interference source can be reported to the cloud platform.

[0117] If there is no external interference, it is possible to directly determine whether partial discharge has occurred in the power equipment based on the internal ultrasonic spectrum. Specifically, the discharge amplitude, discharge frequency, discharge trend, and the conditions of other sensors in the room where the power equipment is located can be used to comprehensively determine whether partial discharge has occurred in the power equipment. The method for determining whether partial discharge has occurred can refer to relevant technologies and will not be repeated here. The relevant original data and judgment results can be reported to the cloud platform.

[0118] If there is external interference and partial discharge occurs in the power equipment, the signal points corresponding to the preset range of the specified phase can be deleted from the internal ultrasonic spectrum generated by the same corresponding ultrasonic acquisition unit based on the internal ultrasonic signal according to the specified phase of the signal point with the highest amplitude in each external ultrasonic spectrum. For example, the signal points within the range of ±10ms centered on the specified phase can be deleted to eliminate the influence of external interference on the ultrasonic signal collected by the internal ultrasonic probe, and then a comprehensive judgment of partial discharge is made based on the remaining signal points in the internal ultrasonic spectrum, and the relevant raw data and judgment results can be reported to the cloud platform. In actual applications, the raw data of the internal ultrasonic signal, the internal ultrasonic spectrum, the raw data of the external ultrasonic signal, the external ultrasonic spectrum, the judgment result of whether there is partial discharge, the target location of the interference source, etc. can also be sent to the cloud platform at the same time.

[0119] In actual applications, operation and maintenance personnel can confirm whether the alarm is a false alarm caused by external interference based on the target location of the reported interference source; if it is confirmed that it is not external interference, the local discharge type in the power equipment can be judged based on the internal ultrasonic spectrum according to the preset judgment algorithm for local discharge. For example, the local discharge type can be corona discharge, surface discharge, suspended discharge, etc., and the severity of the accident can be judged in combination with manual methods to decide whether it needs to be handled.

[0120] In the related technologies, in the substation and distribution scenarios, most of the work of the operation and maintenance personnel is to deal with false alarms, which greatly wastes human resources. This method provides a method for identifying and locating interference sources, which can greatly eliminate false alarms caused by external interference and reduce the frequency of manual processing. At the same time, it can provide the possible location and type of interference source to assist in manual interference elimination.

[0121] In this system, the ultrasonic acquisition unit adopts an internal and external dual probe structure, which can monitor the internal and external environment of the power equipment, such as the inside of the switch cabinet and the switch room environment. According to the external ultrasonic signal and internal ultrasonic signal collected by the dual-probe acquisition unit, it can be determined whether a signal is a partial discharge signal or an external interference signal. At the same time, an ultrasonic acquisition unit array composed of multiple ultrasonic acquisition units can be installed in the room where the power equipment is located. If there is external interference, the external ultrasonic signal collected by the ultrasonic acquisition unit array can be used to calculate the location of the interference source in the space, and assist in manually eliminating the interference source.

[0122] like Figure 8 A schematic diagram of a positioning effect is shown, which includes four switch cabinets, each of which is equipped with an ultrasonic acquisition unit, as shown in the black filled box in the figure. Through detection, it is determined that there is an interference source in the external environment, as shown in the black dot in the figure. The alarm type, alarm name, etc. can be displayed in the alarm list.

[0123] The above-mentioned interference source location method of partial discharge of power equipment provides an interaction mechanism between the cloud platform and operation and maintenance personnel, which not only realizes the monitoring and management of power equipment, but also can continuously train and optimize the recognition model based on all the data in the cloud platform, thereby continuously improving the accuracy and reliability of interference source location.

[0124] The detection method of partial discharge of power equipment provided in this embodiment can timely and effectively discover hidden dangers of power operation in power transformation and distribution equipment facilities. This method has the following advantages:

[0125] 1. Timeliness: The target location of the collected interference source can be reported to the cloud platform in a timely manner and the inspection personnel can be notified to handle it.

[0126] 2. Reliability, extremely low false alarm rate, minimizing the ineffective workload of operation and maintenance personnel.

[0127] 3. Portability. Traditional detection equipment is equipped with a server host and large-scale supporting software, which is expensive and has a low deployment rate. It cannot be deployed in large quantities at locations with higher risk points. The supporting equipment of this embodiment is simple, uses wireless communication, is battery-powered, does not require wiring, and can be deployed quickly and easily.

[0128] The system uses UWB technology to perform high-precision time synchronization to improve the accuracy of interference source positioning; calculates phase differences through feature recognition of ultrasonic spectra; and performs planar positioning of interference sources by clustering the intersection sets of each two sets of hyperbolas. The system also uses a method of deleting signal points within a preset range of the specified phase from the corresponding internal ultrasonic spectra generated based on the internal ultrasonic signal according to the specified phase of the signal point with the highest amplitude in each external ultrasonic spectrum, and uses the amplitude, trend and other characteristics to issue partial discharge alarms.

[0129] The embodiment of the present invention also provides a gateway device, see Fig. 9 As shown, the gateway device includes a processor 130 and a memory 131 , wherein the memory 131 stores machine executable instructions that can be executed by the processor 130 , and the processor 130 executes the machine executable instructions to implement the above-mentioned interference source locating method of partial discharge of electric power equipment.

[0130] Further, Fig. 9 The gateway device shown further includes a bus 132 and a communication interface 133 , and the processor 130 , the communication interface 133 and the memory 131 are connected via the bus 132 .

[0131] The memory 131 may include a random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 133 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 132 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0132] The processor 130 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware or software instructions in the processor 130. The above processor 130 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 131, and the processor 130 reads the information in the memory 131 and completes the steps of the method of the above embodiment in combination with its hardware.

[0133] An embodiment of the present invention also provides a machine-readable storage medium, which stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the above-mentioned method for locating interference sources of partial discharge of power equipment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0134] The computer program product of the interference source location method, system and gateway device of partial discharge of power equipment provided in the embodiments of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiments. The specific implementation can be found in the method embodiments, which will not be repeated here.

[0135] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the 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 several instructions for 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, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for locating interference sources of partial discharge of power equipment, characterized in that: The method is applied to a gateway device, the gateway device is communicatively connected with at least three ultrasonic acquisition units, each of which is installed on the outer surface of the power equipment; the method comprises: For each of the ultrasonic collection units, the external ultrasonic signal of the external environment of the electric power equipment is periodically collected by the ultrasonic collection unit; Arrange the external ultrasonic signals of multiple cycles in time series to obtain the external ultrasonic spectrum corresponding to the ultrasonic acquisition unit; If there is a signal point with an amplitude exceeding a preset threshold value in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, obtaining a first signal point with the highest amplitude and its corresponding first phase from the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit; Based on the first phase, selecting second signal points with the highest amplitude from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, wherein the first ultrasonic acquisition unit is other ultrasonic acquisition units except the designated ultrasonic acquisition unit; Based on the first signal point and each of the second signal points, generating a hyperbola representing a trajectory of an interference source corresponding to each of the first ultrasonic acquisition units; Based on the hyperbola, locate the target position of the interference source; The step of generating a hyperbola representing an interference source trajectory corresponding to each of the first ultrasonic acquisition units based on the first signal point and each of the second signal points comprises: Acquire a second phase corresponding to each of the second signal points; Calculate the phase difference between each second signal point and the first signal point according to each second phase and the first phase; For each of the first ultrasonic acquisition units, a hyperbola representing the interference source trajectory corresponding to the first ultrasonic acquisition unit is generated according to the designated position information of the designated ultrasonic acquisition unit, the phase difference corresponding to the first ultrasonic acquisition unit, and the first position information.

2. The method according to claim 1, characterized in that Based on the first phase, the step of selecting the second signal point with the highest amplitude from the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit includes: In the external ultrasonic spectrum corresponding to each first ultrasonic acquisition unit, taking the first phase as a reference and according to a preset phase range, determining the target phase interval corresponding to each first ultrasonic acquisition unit; From each of the target phase intervals, a second phase point with the highest amplitude is selected respectively.

3. The method according to claim 1, characterized in that The step of locating the target position of the interference source based on the hyperbola comprises: Using a clustering algorithm, clustering is performed on each set of intersection points of two groups of hyperbolas to obtain target points corresponding to the intersection points. Based on the position of the target point, the target position of the interference source is located.

4. The method according to claim 3, characterized in that Based on the position of the target point, the step of locating the target position of the interference source includes: Based on the position of the target point, determining a target area; The target position of the interference source is determined based on the center position of the target area.

5. The method according to claim 1, characterized in that Each of the ultrasonic acquisition units and the gateway device maintains time synchronization using an ultra-wideband method.

6. A system for locating interference sources of partial discharge of power equipment, characterized in that: The system includes: at least three ultrasound acquisition units, a gateway device and a cloud platform; Each of the ultrasonic collection units is used to periodically collect external ultrasonic signals from the external environment of the power equipment, and send multiple cycles of external ultrasonic signals to the gateway device; The gateway device is used to adopt the interference source positioning method according to any one of claims 1 to 5 to obtain the external ultrasonic spectrum corresponding to each of the ultrasonic acquisition units, and locate the target position of the interference source based on each of the external ultrasonic spectrum, and send each of the external ultrasonic spectrum and the target position to the cloud platform; The cloud platform is used to send each of the external ultrasonic spectra to a pre-trained recognition model to output the interference type of the interference source through the recognition model; and generate alarm information based on the target position and the interference type to prompt the user to eliminate the interference source.

7. The system according to claim 6, characterized in that Each of the ultrasonic acquisition units has an inner probe and an outer probe; the inner probe is used to collect internal ultrasonic signals inside the corresponding power equipment; the outer probe is used to collect external ultrasonic signals from the external environment of the corresponding power equipment.

8. The system according to claim 7, characterized in that The gateway device is also used for: Determine whether there is a signal point with an amplitude exceeding a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit; determine whether there is partial discharge in the corresponding power equipment according to the internal ultrasonic signal collected by each of the internal probes; If there is a signal point whose amplitude exceeds a preset threshold value in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and there is no partial discharge in the corresponding power equipment, the target position of the interference source is located based on each of the external ultrasonic spectrum; If there are signal points with amplitudes exceeding a preset threshold in the external ultrasonic spectrum corresponding to the designated ultrasonic acquisition unit, and local discharge exists in the corresponding power equipment, the signal points within the preset range of the designated phase are deleted from the corresponding internal ultrasonic spectrum generated based on the internal ultrasonic signal according to the designated phase of the signal point with the highest amplitude in each external ultrasonic spectrum, so as to continue to judge whether there is local discharge in the corresponding power equipment based on the remaining signal points in the internal ultrasonic spectrum.

9. A gateway device, characterized in that: It comprises a processor and a memory, wherein the memory stores machine executable instructions that can be executed by the processor, and the processor executes the machine executable instructions to implement the interference source locating method of partial discharge of electric power equipment as described in any one of claims 1-5.

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