GIS partial discharge positioning method and device, electronic equipment and storage medium

Abstract

The application discloses a GIS partial discharge positioning method and device, electronic equipment and a storage medium, and is used for solving the technical problems that the existing GIS partial discharge positioning method depends on manual real-time measurement, the labor cost is high, historical data cannot be positioned, and missed detection is easy. The application comprises the following steps: collecting pulse signals on a GIS channel according to a preset sampling length; calculating a first pulse arrival time of the pulse signals reaching a preset first ultrahigh frequency sensor; calculating a second pulse arrival time of the pulse signals reaching a preset second ultrahigh frequency sensor; calculating a time difference between the first pulse arrival time and the second pulse arrival time; and positioning a partial discharge point on the GIS according to the time difference.

Description

Technical Field

[0001] This invention relates to the field of discharge location technology, and in particular to a GIS partial discharge location method, device, electronic device, and storage medium. Background Technology

[0002] Gas-insulated switchgear (GIS) is a key component of urban power grids, playing a crucial role in ensuring power supply reliability and thus receiving significant attention from power grid companies. Potential insulation defects may be left over from the manufacturing and construction of GIS equipment. With increasing operating years, these defects can develop into dangerous discharge paths, potentially leading to GIS breakdown faults, accidents, economic losses, and personal injury.

[0003] Internal insulation defects in GIS (Gas Insulation System) are often accompanied by partial discharge phenomena. Using ultra-high frequency partial discharge detection technology and a live partial discharge detection device, internal insulation defects can be detected during normal GIS operation. This allows for real-time assessment of the health status of GIS equipment without affecting power grid operation, enabling timely detection of potential problems and preventing equipment failure.

[0004] Digital twins are simulation processes that fully utilize data such as physical models, sensor updates, and operational history to integrate multiple disciplines, physical quantities, scales, and probabilities, and complete mapping in virtual space to reflect the entire life cycle of the corresponding physical equipment.

[0005] With the expansion of power grid construction and the promotion of the digital economy, the digitalization and intelligentization of power grids are becoming increasingly urgent needs for the development of the power industry.

[0006] The existing method for locating partial discharge in GIS involves technicians manually triggering a partial discharge pulse at the GIS site using a high-speed oscilloscope, measuring the time difference between the pulse arrival at two sensors, and calculating the distance of the partial discharge source from one of the sensors based on the sensor spacing and pulse propagation speed.

[0007] However, traditional GIS time-difference method for partial discharge localization requires a high-speed oscilloscope with a sampling rate of at least 10 GS / s, manual on-site triggering of the partial discharge signal, and manual calculation of the pulse arrival time difference and localization result. This method has the following problems:

[0008] 1. It requires highly skilled operators and consumes a lot of manpower and resources;

[0009] 2. Additional investment in equipment (high-speed oscilloscope) is required;

[0010] 3. It is difficult to locate intermittent signals and it is impossible to locate them using historical data;

[0011] 4. When dealing with multiple discharge defects, we may only focus on one discharge while ignoring the others.

[0012] 5. The location cannot be determined by referring to the PRPD spectrum to determine whether the pulse is a discharge or noise. Summary of the Invention

[0013] This invention provides a GIS partial discharge location method, device, electronic device, and storage medium to solve the technical problems of existing GIS partial discharge location methods that rely on real-time manual measurement, have high labor costs, cannot locate based on historical data, and are prone to missed detections.

[0014] This invention provides a GIS partial discharge localization method, comprising:

[0015] Collect pulse signals from the GIS channel according to the preset sampling length;

[0016] Calculate the arrival time of the first pulse of the pulse signal arriving at the preset first ultra-high frequency sensor;

[0017] Calculate the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor;

[0018] Calculate the time difference between the arrival time of the first pulse and the arrival time of the second pulse;

[0019] The partial discharge point on the GIS is located based on the time difference.

[0020] Optionally, the step of calculating the arrival time of the first pulse of the pulse signal at the preset first ultra-high frequency sensor includes:

[0021] Determine the pulse signal at the first rising edge trigger time of the first ultra-high frequency sensor, and obtain a first preset number of first sampling points based on the first rising edge trigger time;

[0022] Determine the first target sampling point from the first sampling points;

[0023] The first voltage amplitude of the first target sampling point is acquired by the first ultra-high frequency sensor;

[0024] Determine the first maximum value of the first voltage amplitude, and use twice the first maximum value as the first threshold.

[0025] The first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak are obtained;

[0026] Calculate the first midpoint between the first time point and the second time point, and use it as the arrival time of the first pulse from the first UHF sensor.

[0027] Optionally, the step of calculating the arrival time of the second pulse of the pulse signal at the preset second ultra-high frequency sensor includes:

[0028] Determine the second rising edge trigger time of the pulse signal at the second ultra-high frequency sensor, and obtain a second preset number of second sampling points based on the second rising edge trigger time;

[0029] Determine the second target sampling point from the second sampling point;

[0030] The second voltage amplitude of the second target sampling point is acquired by the second ultra-high frequency sensor;

[0031] Determine the second maximum value of the second voltage amplitude, and use twice the second maximum value as the second threshold.

[0032] The third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak are obtained;

[0033] Calculate the second midpoint between the third time point and the fourth time point, and use it as the arrival time of the second pulse from the second UHF sensor.

[0034] Optionally, the step of calculating the time difference between the arrival time of the first pulse and the arrival time of the second pulse includes:

[0035] Calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, and use it as the initial time difference between the arrival times of the first pulse and the second pulse.

[0036] Taking the arrival time of the first pulse as the center, extract a first pulse segment of a preset width from the pulse signal;

[0037] Centered on the arrival time of the second pulse, extract a second pulse segment of a preset width from the pulse signal;

[0038] Calculate the correlation between the first pulse segment and the second pulse segment;

[0039] The fine-tuning amount is determined based on the correlation;

[0040] The sum of the initial time difference and the fine-tuning amount is calculated as the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0041] The present invention also provides a GIS partial discharge location device, comprising:

[0042] The pulse signal acquisition module is used to acquire pulse signals on the GIS channel according to a preset sampling length.

[0043] The first pulse arrival time calculation module is used to calculate the first pulse arrival time of the pulse signal arriving at the preset first ultra-high frequency sensor;

[0044] The second pulse arrival time calculation module is used to calculate the second pulse arrival time of the pulse signal arriving at the preset second ultra-high frequency sensor.

[0045] The time difference calculation module is used to calculate the time difference between the arrival time of the first pulse and the arrival time of the second pulse;

[0046] A partial discharge point location module is used to locate partial discharge points on the GIS based on the time difference.

[0047] Optionally, the first pulse arrival time calculation module includes:

[0048] The first sampling point acquisition submodule is used to determine the pulse signal at the first rising edge trigger time of the first ultra-high frequency sensor, and to acquire a first preset number of first sampling points based on the first rising edge trigger time;

[0049] The first target sampling point determination submodule is used to determine the first target sampling point among the first sampling points;

[0050] The first voltage amplitude acquisition submodule is used to acquire the first voltage amplitude of the first target sampling point through the first ultra-high frequency sensor;

[0051] The first threshold determination submodule is used to determine the first maximum value of the first voltage amplitude and use twice the first maximum value as the first threshold.

[0052] The first and second moment acquisition submodule is used to acquire the first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak.

[0053] The first pulse arrival time calculation submodule is used to calculate the first midpoint between the first time and the second time, which is taken as the first pulse arrival time of the first UHF sensor.

[0054] Optionally, the second pulse arrival time calculation module includes:

[0055] The second sampling point acquisition submodule is used to determine the pulse signal at the second rising edge trigger time of the second ultra-high frequency sensor, and to acquire a second preset number of second sampling points based on the second rising edge trigger time;

[0056] The second target sampling point determination submodule is used to determine the second target sampling point among the second sampling points;

[0057] The second voltage amplitude acquisition submodule is used to acquire the second voltage amplitude of the second target sampling point through the second ultra-high frequency sensor;

[0058] The second threshold determination submodule is used to determine the second maximum value of the second voltage amplitude and use twice the second maximum value as the second threshold.

[0059] The third and fourth moment acquisition submodule is used to acquire the third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak.

[0060] The second pulse arrival time calculation submodule is used to calculate the second midpoint between the third time and the fourth time, which is used as the second pulse arrival time of the second UHF sensor.

[0061] Optionally, the time difference calculation module includes:

[0062] The initial time difference calculation submodule is used to calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, which is used as the initial time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0063] The first pulse segment extraction submodule is used to extract a first pulse segment of a preset width from the pulse signal, centered on the arrival time of the first pulse.

[0064] The second pulse segment extraction submodule is used to extract a second pulse segment of a preset width from the pulse signal, centered on the arrival time of the second pulse.

[0065] The correlation calculation submodule is used to calculate the correlation between the first pulse segment and the second pulse segment;

[0066] The fine-tuning amount determination submodule is used to determine the fine-tuning amount based on the correlation.

[0067] The time difference calculation submodule is used to calculate the sum of the initial time difference and the fine-tuning amount as the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0068] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0069] The memory is used to store program code and transmit the program code to the processor;

[0070] The processor is used to execute the GIS partial discharge location method as described above, according to the instructions in the program code.

[0071] The present invention also provides a computer-readable storage medium for storing program code for executing the GIS partial discharge location method as described in any of the preceding claims.

[0072] As can be seen from the above technical solution, the present invention has the following advantages: The present invention acquires pulse signals on the GIS channel according to a preset sampling length; calculates the arrival time of the first pulse signal arriving at the preset first UHF sensor; calculates the arrival time of the second pulse signal arriving at the preset second UHF sensor; calculates the time difference between the arrival times of the first and second pulses; and locates the partial discharge point on the GIS based on the time difference. This reduces the labor cost of GIS partial discharge location, reduces the false negative rate, and allows for location based on historical data. Attached Figure Description

[0073] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0074] Figure 1 A flowchart illustrating the steps of a GIS partial discharge location method provided in this embodiment of the invention;

[0075] Figure 2 A flowchart illustrating the steps of a GIS partial discharge location method according to another embodiment of the present invention;

[0076] Figure 3 This is a schematic diagram illustrating pulse arrival time determination provided in an embodiment of the present invention;

[0077] Figure 4 This is a schematic diagram showing the distribution of multiple discharge defect location results provided in an embodiment of the present invention;

[0078] Figure 5 This is a structural block diagram of a GIS local positioning device provided in an embodiment of the present invention. Detailed Implementation

[0079] This invention provides a GIS partial discharge location method, device, electronic device, and storage medium to solve the technical problems of existing GIS partial discharge location methods that rely on real-time manual measurement, have high labor costs, cannot locate based on historical data, and are prone to missed detections.

[0080] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0081] Please see Figure 1 , Figure 1 A flowchart illustrating the steps of a GIS partial discharge location method provided in an embodiment of the present invention.

[0082] The present invention provides a GIS partial discharge location method, which may specifically include the following steps:

[0083] Step 101: Collect pulse signals on the GIS channel according to the preset sampling length;

[0084] GIS (gas-insulated metal-enclosed switchgear), also known as "sulfur hexafluoride enclosed combined electrical equipment," is a type of combined high-voltage electrical equipment that combines circuit breakers, disconnectors, grounding switches, fast grounding switches, current transformers, voltage transformers, and busbars, enclosed in a metal casing filled with SF6 gas insulation. GIS equipment is characterized by its small footprint, low installation and maintenance workload, and long maintenance cycle. A conventional 110 kV outgoing line bay in a substation is approximately 8 meters wide, while a GIS equipment bay is only 0.8-1 meter wide. Furthermore, GIS equipment has low electromagnetic radiation and good anti-pollution performance, therefore, GIS substations are increasingly widely used in urban centers.

[0085] A pulse signal is a discrete signal with diverse shapes. Compared to ordinary analog signals (such as sine waves), its waveforms are discontinuous along the Y-axis (there are obvious intervals between waveforms) but possess a certain periodicity. The most common pulse wave is the rectangular wave (also known as a square wave). Pulse signals can be used to represent information, as carrier waves (e.g., in pulse code modulation (PCM) and pulse width modulation (PWM), and also as clock signals for various digital circuits and high-performance chips.

[0086] In this embodiment of the invention, partial discharge generates pulse signals that propagate in the GIS channel. By collecting the pulse signals with a sensor in the GIS channel, the distance between the partial discharge site and the sensor can be calculated based on the collection time and the wave speed of the pulse signals, thereby achieving partial discharge localization.

[0087] In this embodiment of the invention, a pulse signal with a preset sampling length of GIS channel can be obtained through digital twin technology to facilitate subsequent partial discharge positioning.

[0088] Step 102: Calculate the arrival time of the first pulse signal arriving at the preset first ultra-high frequency sensor;

[0089] In this embodiment of the invention, after obtaining the pulse signal, the arrival time of the first pulse of the pulse signal reaching the preset first ultra-high frequency sensor can be calculated.

[0090] Step 103: Calculate the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor;

[0091] In this embodiment of the invention, the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor can be calculated.

[0092] Step 104: Calculate the time difference between the arrival times of the first pulse and the second pulse;

[0093] After calculating the arrival times of the first and second pulses, the time difference between them can be calculated. This time difference can characterize the distance difference between the partial discharge point and the two ultra-high frequency sensors.

[0094] Step 105: Locate the partial discharge point on the GIS based on the time difference.

[0095] After obtaining the time difference between the arrival of the pulse signal at the two UHF sensors, the distance difference between the partial discharge point and the GIS channel can be calculated based on the time difference, and the partial discharge point can be located on the GIS channel based on the distance difference.

[0096] This invention acquires pulse signals on a GIS channel according to a preset sampling length; calculates the arrival time of the first pulse signal reaching a preset first UHF sensor; calculates the arrival time of the second pulse signal reaching a preset second UHF sensor; calculates the time difference between the arrival times of the first and second pulses; and locates partial discharge points on the GIS based on the time difference. This reduces the labor cost of GIS partial discharge location, decreases the missed detection rate, and allows for location based on historical data.

[0097] Please see Figure 2 , Figure 2A flowchart illustrating the steps of a GIS partial discharge localization method according to another embodiment of the present invention. Specifically, it may include the following steps:

[0098] Step 201: Collect pulse signals on the GIS channel according to the preset sampling length;

[0099] Step 201 is the same as step 101. For details, please refer to the description of step 101. It will not be repeated here.

[0100] Step 202: Calculate the arrival time of the first pulse signal arriving at the preset first ultra-high frequency sensor;

[0101] In this embodiment of the invention, after obtaining the pulse signal, the arrival time of the first pulse of the pulse signal reaching the preset first ultra-high frequency sensor can be calculated.

[0102] In one example, the step of calculating the arrival time of the first pulse signal arriving at the preset first ultra-high frequency sensor may include the following sub-steps:

[0103] S21, determine the first rising edge trigger time of the pulse signal in the first ultra-high frequency sensor, and obtain a first preset number of first sampling points based on the first rising edge trigger time;

[0104] S22, determine the first target sampling point in the first sampling point;

[0105] S23, the first voltage amplitude of the first target sampling point is acquired by the first ultra-high frequency sensor;

[0106] S24, determine the first maximum value of the first voltage amplitude, and use twice the first maximum value as the first threshold;

[0107] S25, acquire the first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak;

[0108] S26, calculate the first midpoint between the first time and the second time, and use it as the arrival time of the first pulse from the first UHF sensor.

[0109] In practical applications, the waveform of a partial discharge pulse signal rises rapidly before the peak and falls slowly after the peak. When verifying the pulse arrival time at the sensor, a rising edge triggering mechanism is used. The moment when the pulse voltage detected by the sensor exceeds a set threshold is taken as the pulse arrival time. Under this verification mechanism, a large number of pulse reflections arrive later, without affecting the verification of the wavefront that arrives at the sensor first. Since the discharge time of a partial discharge is very short relative to its insulation recovery time—meaning that for a certain defect, a relatively long insulation recovery time is required before the next discharge occurs—the probability of multiple defects simultaneously discharging within 1 μs is very small, even if multiple defects exist within the GIS. Furthermore, the length of a UHF pulse is very short; a 1 μs sampling time is sufficient to encompass a complete discharge pulse. Therefore, using 1 μs as the sampling length ensures that when multiple partial discharge defects exist within the GIS, their discharge pulses can be triggered and collected separately, thereby achieving the location of multiple discharge sources.

[0110] Since the peak value of each pulse signal is different, and the attenuation degree varies when it reaches different UHF sensors, the threshold value should not be fixed. In a specific implementation, the first rising edge trigger time of the pulse signal in the first UHF sensor can be obtained. Then, based on the first rising edge trigger time, a first preset number of first sampling points can be obtained. Next, a first target sampling point is determined from the first sampling points. The first voltage amplitude of the first target sampling point is collected by the first UHF sensor, and the largest first voltage amplitude among the first target sampling points is determined as the first maximum value. Finally, twice the first maximum value is used as the first threshold value.

[0111] In one example, such as Figure 3 As shown, at a sampling rate of 200 MS / s, upon each rising edge trigger, the first 40 sampling points before the trigger and the last 160 sampling points after the trigger are saved as the first sampling points (a total of 200 sampling points, corresponding to a 1 μs pulse waveform). The first threshold T1 is obtained by taking twice the maximum value of the first voltage amplitude among the first m (e.g., 10) sampling points (the first target sampling points) acquired by the first ultra-high frequency sensor. This can be expressed as:

[0112] T1 = 2max|x q1 (n)|

[0113] Where, x q1 (n) represents the amplitude of the nth sampling point among the first m sampling points of the qth pulse waveform acquired by the first ultra-high frequency sensor, where n ranges from n=1,2,...,m.

[0114] After determining the first threshold, the first moment when the voltage of the pulse signal in the first UHF sensor first reaches the first threshold and the second moment when the pulse signal reaches the first peak can be obtained. Then, the first midpoint between the first moment and the second moment can be calculated as the first pulse arrival time of the first UHF sensor.

[0115] Step 203: Calculate the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor;

[0116] In this embodiment of the invention, after obtaining the pulse signal, the arrival time of the first pulse of the pulse signal reaching the preset first ultra-high frequency sensor can be calculated.

[0117] In one example, the step of calculating the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor may include the following sub-steps:

[0118] S31, determine the second rising edge trigger time of the pulse signal in the second ultra-high frequency sensor, and obtain a second preset number of second sampling points based on the second rising edge trigger time;

[0119] S32, determine the second target sampling point in the second sampling point;

[0120] S33, the second voltage amplitude of the second target sampling point is acquired by the second ultra-high frequency sensor;

[0121] S34, determine the second maximum value of the second voltage amplitude, and use twice the second maximum value as the second threshold;

[0122] S35, acquire the third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak;

[0123] S36, calculate the second midpoint between the third and fourth times, as the arrival time of the second pulse from the second UHF sensor.

[0124] In this embodiment of the invention, the calculation process for the arrival time of the second pulse can refer to the calculation process for the arrival time of the first pulse, and will not be repeated here.

[0125] Step 204: Calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, and use it as the initial time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0126] In this embodiment of the invention, the difference between the arrival time of the first pulse and the arrival time of the second pulse can be calculated as the initial time difference between the arrival times of the first pulse and the second pulse. The initial time difference Δt... q The calculation formula is as follows:

[0127] Δt q =t q2 -t q1

[0128] Among them, t q2 Let t be the arrival time of the second pulse. q1 This is the arrival time of the first pulse.

[0129] Step 205: Taking the arrival time of the first pulse as the center, extract the first pulse segment of a preset width from the pulse signal;

[0130] Step 206: Extract a second pulse segment of a preset width from the pulse signal, centered on the arrival time of the second pulse;

[0131] Step 207: Calculate the correlation between the first pulse segment and the second pulse segment;

[0132] To correct for the calculated time difference, at the two arrival times t q2 and t q1 Add a window with a width of 2p nearby to extract the pulse waveforms of most interest (the first and second pulse segments), and express their amplitude as y. qi (n) is:

[0133] y qi (n)=x qi (Δt q -(p+1)+n)

[0134] The value of n is n = 1, 2, ..., 2p+1.

[0135] Calculate the correlation of the q-th pulse waveform acquired by the first and second UHF sensors within a window of width 2p:

[0136]

[0137] Among them, R q12 (j) represents the correlation between -p and p of the q-th pulse signal acquired by the first and second UHF sensors, where j ranges from -p to p.

[0138] Step 208: Determine the fine-tuning amount based on the correlation;

[0139] After calculating the correlation between -p and p of the q-th pulse signal acquired by the first and second UHF sensors, we can compare the correlations of each Rq. q12 Find the value of (j) and determine R. q12(j) When j is at its maximum, the time difference between the arrival of the q-th discharge pulse at the first and second UHF sensors is fine-tuned, and the fine-tuning formula is:

[0140] Δt q '=Δt q +j

[0141] Where, Δt q ' is the time difference between the arrival times of the first pulse and the second pulse.

[0142] Step 209: Calculate the sum of the initial time difference and the fine-tuning amount as the time difference between the arrival time of the first pulse and the arrival time of the second pulse;

[0143] Step 210: Locate the partial discharge point on the GIS based on the time difference.

[0144] After obtaining the time difference, the partial discharge point on the GIS can be located based on the time difference.

[0145] Due to limitations in hardware cost and data storage space, a data acquisition card with a sampling rate of 200MS / s and a sampling interval of 5ns is used. Only the pulse envelope can be sampled. When the pulse arrival time is determined, the verification error of a single sampling point can reach 5ns, and the error in the calculation result of the power supply position can reach 1.5 meters.

[0146] Therefore, the main problem to be solved is achieving positioning accuracy of a few tenths of a meter on a low-sampling-rate acquisition card with practical application value. Under the premise of low sampling rate, statistics can provide a solution. Although the positioning error of a single attempt can reach 1.5 meters, for multiple pulse positioning attempts, the number of positioning results near the actual discharge source location is theoretically the highest. Therefore, using the method of multiple positioning attempts and taking the average of the distribution of positioning results can further improve positioning accuracy.

[0147] Assume t1 is the actual time when the pulse signal arrives at the first UHF sensor, t q1 Let ' be the time when the calculated pulse signal arrives at the first UHF sensor, and e1 be the error between the two. Then we have:

[0148] e1 = t q1 ′-t1

[0149] As can be seen from the above analysis, when the sampling rate is 200Ms / s, the detection error of the arrival time of a single pulse can reach 5ns. Therefore, e1 satisfies a uniform distribution in the interval [-5,5]ns.

[0150] Assume t2 is the actual time when the pulse signal arrives at the second UHF sensor, t q2Let ' be the calculated time when the pulse signal arrives at the second UHF sensor, and e2 be the error between the two. Similarly, e2 is uniformly distributed in the interval [-5, 5] ns.

[0151] The calculated time difference of arrival can be expressed as:

[0152] t q1 '-t q2 = (t1-t2)-(e1-e2)

[0153] From the above formula, we can see that the error between the calculated arrival time difference and the actual arrival time difference is (e2-e1). Since e1 and e2 are two independent uniform distributions, (e2-e1) satisfies a normal distribution, i.e., (t q1 '-t q2 ') also satisfies a normal distribution.

[0154] Based on this principle, the time difference positioning method is used to locate multiple pulses of partial discharge. The positioning result is used as the x-axis and the number of positioning is used as the y-axis. The multiple positioning results are plotted on a graph. The specific method is as follows: at the beginning, the y-value corresponding to each point on the x-axis is set to 0. When the positioning result of a certain pulse is x1, the corresponding point on the x-axis is found in the graph, and the positioning count of that point is incremented by 1. This operation is performed on all pulse positioning results to obtain a distribution graph of the number of positioning results with respect to the positioning results. The peak value of the distribution of positioning results is used as the final positioning result.

[0155] Furthermore, noise interference is a significant issue in on-site partial discharge localization. In addition, when multiple discharge defects exist in a GIS, discharge signals with small pulse amplitudes and low frequencies are easily masked by discharge signals with large pulse amplitudes and high frequencies, potentially leading to focusing only on the discharge pulse of a single defect while ignoring others. Noise signals are not generated by partial discharges, and their localization results do not exhibit a normal distribution; however, different discharge defects do not discharge simultaneously, and their discharge pulses do not interfere with each other, thus allowing for individual localization. When partial discharge signals are accompanied by noise signals, or when multiple discharge defects coexist, plotting multiple localization results on the same graph yields a distribution map that approximates multiple superimposed normal distribution curves, such as... Figure 4 As shown.

[0156] If two discharge defects are located close to each other, and the peak values ​​of the two location results are not completely separated, separation can be achieved by selecting the location results of pulses in different observation areas on the PRPD spectrum. Alternatively, after initial location, combining the PRPD spectrum and selecting only the discharge signal location result of one discharge defect to draw a distribution map can also separate other signals and obtain more accurate location results.

[0157] The PRPD (Phase Distribution Phase Path) map displays the pulse signals (carrying phase) generated by partial discharge in a two-dimensional coordinate system. The PRPD map can be viewed as a long-term accumulation of the PRPS (Phase Distribution Phase Path) map on the power frequency period-amplitude plane, and is an important basis for determining the type of partial discharge.

[0158] Please see Figure 5 , Figure 5 This is a structural block diagram of a GIS local positioning device provided in an embodiment of the present invention.

[0159] This invention provides a GIS partial discharge location device, comprising:

[0160] The pulse signal acquisition module 501 is used to acquire pulse signals on the GIS channel according to a preset sampling length.

[0161] The first pulse arrival time calculation module 502 is used to calculate the first pulse arrival time of the pulse signal arriving at the preset first ultra-high frequency sensor;

[0162] The second pulse arrival time calculation module 503 is used to calculate the second pulse arrival time of the pulse signal arriving at the preset second ultra-high frequency sensor.

[0163] The time difference calculation module 504 is used to calculate the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0164] Partial discharge point location module 505 is used to locate partial discharge points on GIS based on time difference.

[0165] In this embodiment of the invention, the first pulse arrival time calculation module 502 includes:

[0166] The first sampling point acquisition submodule is used to determine the first rising edge trigger time of the pulse signal in the first ultra-high frequency sensor, and to acquire a first preset number of first sampling points based on the first rising edge trigger time.

[0167] The first target sampling point determination submodule is used to determine the first target sampling point among the first sampling points;

[0168] The first voltage amplitude acquisition submodule is used to acquire the first voltage amplitude of the first target sampling point through the first ultra-high frequency sensor;

[0169] The first threshold determination submodule is used to determine the first maximum value of the first voltage amplitude and use twice the first maximum value as the first threshold.

[0170] The first and second moment acquisition submodule is used to acquire the first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak.

[0171] The first pulse arrival time calculation submodule is used to calculate the first midpoint between the first time and the second time, which is used as the first pulse arrival time of the first UHF sensor.

[0172] In this embodiment of the invention, the second pulse arrival time calculation module 503 includes:

[0173] The second sampling point acquisition submodule is used to determine the second rising edge trigger time of the pulse signal in the second ultra-high frequency sensor, and to acquire a second preset number of second sampling points based on the second rising edge trigger time.

[0174] The second target sampling point determination submodule is used to determine the second target sampling point among the second sampling points;

[0175] The second voltage amplitude acquisition submodule is used to acquire the second voltage amplitude of the second target sampling point through the second ultra-high frequency sensor;

[0176] The second threshold determination submodule is used to determine the second maximum value of the second voltage amplitude and use twice the second maximum value as the second threshold.

[0177] The third and fourth moment acquisition submodules are used to acquire the third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak.

[0178] The second pulse arrival time calculation submodule is used to calculate the second midpoint between the third and fourth times, which serves as the second pulse arrival time of the second UHF sensor.

[0179] In this embodiment of the invention, the time difference calculation module 504 includes:

[0180] The initial time difference calculation submodule is used to calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, which is used as the initial time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0181] The first pulse segment extraction submodule is used to extract a first pulse segment of a preset width from the pulse signal, centered on the arrival time of the first pulse.

[0182] The second pulse segment extraction submodule is used to extract a second pulse segment of a preset width from the pulse signal, centered on the arrival time of the second pulse.

[0183] The correlation calculation submodule is used to calculate the correlation between the first pulse segment and the second pulse segment;

[0184] The fine-tuning amount determination submodule is used to determine the fine-tuning amount based on correlation.

[0185] The time difference calculation submodule is used to calculate the sum of the initial time difference and the fine-tuning amount, which is the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

[0186] This invention also provides an electronic device, which includes a processor and a memory:

[0187] The memory is used to store program code and transfer the program code to the processor;

[0188] The processor is used to execute the GIS partial discharge location method of this invention according to the instructions in the program code.

[0189] This invention also provides a computer-readable storage medium for storing program code for executing the GIS partial discharge location method of this invention.

[0190] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0191] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0192] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0193] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0194] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0195] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0196] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0197] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0198] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A GIS partial discharge localization method, characterized in that, include: Collect pulse signals from the GIS channel according to the preset sampling length; Calculate the arrival time of the first pulse of the pulse signal arriving at the preset first ultra-high frequency sensor; Calculate the arrival time of the second pulse of the pulse signal arriving at the preset second ultra-high frequency sensor; Calculate the time difference between the arrival time of the first pulse and the arrival time of the second pulse; The partial discharge point on the GIS is located based on the time difference; The step of calculating the arrival time of the first pulse of the pulse signal arriving at the preset first ultra-high frequency sensor includes: Determine the pulse signal at the first rising edge trigger time of the first ultra-high frequency sensor, and obtain a first preset number of first sampling points based on the first rising edge trigger time; Determine the first target sampling point from the first sampling points; The first voltage amplitude of the first target sampling point is acquired by the first ultra-high frequency sensor; Determine the first maximum value of the first voltage amplitude, and use twice the first maximum value as the first threshold. The first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak are obtained; Calculate the first midpoint between the first time point and the second time point, and take it as the arrival time of the first pulse from the first ultra-high frequency sensor; The step of calculating the arrival time of the second pulse of the pulse signal to the preset second ultra-high frequency sensor includes: Determine the second rising edge trigger time of the pulse signal at the second ultra-high frequency sensor, and obtain a second preset number of second sampling points based on the second rising edge trigger time; Determine the second target sampling point from the second sampling point; The second voltage amplitude of the second target sampling point is acquired by the second ultra-high frequency sensor; Determine the second maximum value of the second voltage amplitude, and use twice the second maximum value as the second threshold. The third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak are obtained; Calculate the second midpoint between the third time point and the fourth time point, and use it as the arrival time of the second pulse from the second ultra-high frequency sensor; The step of calculating the time difference between the arrival time of the first pulse and the arrival time of the second pulse includes: Calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, and use it as the initial time difference between the arrival times of the first pulse and the second pulse. Taking the arrival time of the first pulse as the center, extract a first pulse segment of a preset width from the pulse signal; Centered on the arrival time of the second pulse, extract a second pulse segment of a preset width from the pulse signal; Calculate the correlation between the first pulse segment and the second pulse segment; The fine-tuning amount is determined based on the correlation; The sum of the initial time difference and the fine-tuning amount is calculated as the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

2. A GIS partial discharge locating device, characterized in that, include: The pulse signal acquisition module is used to acquire pulse signals on the GIS channel according to a preset sampling length. The first pulse arrival time calculation module is used to calculate the first pulse arrival time of the pulse signal arriving at the preset first ultra-high frequency sensor; The second pulse arrival time calculation module is used to calculate the second pulse arrival time of the pulse signal arriving at the preset second ultra-high frequency sensor. The time difference calculation module is used to calculate the time difference between the arrival time of the first pulse and the arrival time of the second pulse; A partial discharge point location module is used to locate partial discharge points on the GIS based on the time difference. The first pulse arrival time calculation module includes: The first sampling point acquisition submodule is used to determine the pulse signal at the first rising edge trigger time of the first ultra-high frequency sensor, and to acquire a first preset number of first sampling points based on the first rising edge trigger time; The first target sampling point determination submodule is used to determine the first target sampling point among the first sampling points; The first voltage amplitude acquisition submodule is used to acquire the first voltage amplitude of the first target sampling point through the first ultra-high frequency sensor; The first threshold determination submodule is used to determine the first maximum value of the first voltage amplitude and use twice the first maximum value as the first threshold. The first and second moment acquisition submodule is used to acquire the first moment when the voltage of the pulse signal in the first ultra-high frequency sensor first reaches the first threshold, and the second moment when the pulse signal reaches the first peak. The first pulse arrival time calculation submodule is used to calculate the first midpoint between the first time and the second time, which is used as the first pulse arrival time of the first UHF sensor. The second pulse arrival time calculation module includes: The second sampling point acquisition submodule is used to determine the pulse signal at the second rising edge trigger time of the second ultra-high frequency sensor, and to acquire a second preset number of second sampling points based on the second rising edge trigger time; The second target sampling point determination submodule is used to determine the second target sampling point among the second sampling points; The second voltage amplitude acquisition submodule is used to acquire the second voltage amplitude of the second target sampling point through the second ultra-high frequency sensor; The second threshold determination submodule is used to determine the second maximum value of the second voltage amplitude and use twice the second maximum value as the second threshold. The third and fourth moment acquisition submodule is used to acquire the third moment when the voltage of the pulse signal in the second ultra-high frequency sensor first reaches the second threshold, and the fourth moment when the pulse signal reaches the first peak. The second pulse arrival time calculation submodule is used to calculate the second midpoint between the third time and the fourth time, as the second pulse arrival time of the second UHF sensor. The time difference calculation module includes: The initial time difference calculation submodule is used to calculate the difference between the arrival time of the first pulse and the arrival time of the second pulse, which is used as the initial time difference between the arrival time of the first pulse and the arrival time of the second pulse. The first pulse segment extraction submodule is used to extract a first pulse segment of a preset width from the pulse signal, centered on the arrival time of the first pulse. The second pulse segment extraction submodule is used to extract a second pulse segment of a preset width from the pulse signal, centered on the arrival time of the second pulse. The correlation calculation submodule is used to calculate the correlation between the first pulse segment and the second pulse segment; The fine-tuning amount determination submodule is used to determine the fine-tuning amount based on the correlation. The time difference calculation submodule is used to calculate the sum of the initial time difference and the fine-tuning amount as the time difference between the arrival time of the first pulse and the arrival time of the second pulse.

3. An electronic device, characterized in that, The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the GIS partial discharge location method according to the instructions in the program code as described in claim 1.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for executing the GIS partial discharge location method according to claim 1.

Images