Discharge positioning device of discharge equipment
By deploying multiple antennas around the discharge equipment, using envelope detectors and shaping circuits to process the signals, and combining this with FPGA phase shifting, the problem of high detection costs for discharge equipment was solved, achieving low-cost and high-precision discharge positioning.
Patent Information
- Application Number
- CN202411173066.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2026-03-03
AI Technical Summary
Existing technologies for detecting discharge equipment are costly and have low applicability. Traditional array antenna detection methods are expensive and cannot be widely adopted in substations.
Multiple antennas are deployed around the discharge equipment. The antenna signals are demodulated using an envelope detector, and the discharge pulse signals are obtained through shaping circuitry. The antenna reception time is determined by phase shifting based on the source clock using FPGA, and the discharge position is calculated in combination with the antenna position.
It achieves low-cost discharge equipment detection, and the calculated discharge location is highly accurate, reducing detection costs and improving location accuracy.
Smart Images
Figure CN121596040A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of discharge equipment detection technology, and in particular to a discharge positioning device for discharge equipment. Background Technology
[0002] Discharge equipment is a key component of substations, responsible for voltage transmission and transformation. The continuous power supply dictates that discharge equipment cannot be shut down for maintenance; therefore, it is necessary to diagnose its operational status through continuous monitoring.
[0003] Partial discharge signals are instantaneous discharges with high instantaneous energy and a wide frequency band distribution. They are both a sign and manifestation of insulation degradation in discharging equipment, and a cause of further insulation degradation. Therefore, monitoring partial discharge signals is an effective means of timely detecting insulation defects in discharging equipment and preventing insulation breakdown faults.
[0004] Traditional array antenna detection methods utilize high-speed sampling circuits to sample the signals received by the antennas at high frequencies, thereby obtaining the waveform of the discharge signal and the time difference between each antenna. This method requires a sampling rate of at least 2 GHz for the antenna echo, and the detection equipment is a multi-channel high-speed real-time sampling device. Such equipment is expensive and cannot be widely used for the detection needs of most substations. Summary of the Invention
[0005] Based on the above analysis, the present invention aims to provide a discharge positioning device for discharge equipment to solve the problems of high operation and detection costs and low applicability of discharge equipment in the prior art.
[0006] This invention provides a discharge positioning device for a discharge device, the discharge positioning device comprising:
[0007] Multiple antennas are deployed around the discharge device to receive the original partial discharge signal emitted by the discharge device and output multiple antenna signals.
[0008] Multiple envelope detectors, each connected to an antenna, are used to demodulate the antenna signal and output a low-frequency detection signal.
[0009] Multiple shaping circuits, each connected to an envelope detector, are used to process low-frequency detection signals and output discharge pulse signals to the FPGA;
[0010] The FPGA is used to count each input discharge pulse signal according to multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal; wherein, the multiple counting clocks are obtained by phase shifting the source clock of the FPGA.
[0011] The positioning module is used to locate the discharge position of the discharge device based on the time when each antenna receives the original partial discharge signal and the position of each antenna, so as to obtain the discharge positioning position of the discharge device.
[0012] Based on further improvements to the above-mentioned device, the shaping circuit includes a printed line delay circuit, a first operational amplifier, a second operational amplifier, and a comparator;
[0013] The input terminal of the printed line delay circuit is connected to an envelope detector to receive low-frequency detection signals and output the voltage and reference voltage at each observation point in the low-frequency detection signal.
[0014] The first operational amplifier and the second operational amplifier amplify the voltage and reference voltage at each observation point and output them to the comparator.
[0015] The comparator sequentially compares the voltage at each observation point with the reference voltage, and outputs a discharge pulse signal based on the comparison results.
[0016] Based on further improvements to the above-mentioned device, the printed line delay circuit includes printed lines and multiple voltage divider resistors;
[0017] A tap for the observation point is set at the center of the printed line, and the tap for the observation point is connected to the first operational amplifier;
[0018] The same number of sampling point taps are set on both sides of the center of the printed line, and each sampling point tap is connected to the second operational amplifier through a voltage divider resistor.
[0019] Based on further improvements to the above device, the distance between the taps of two adjacent sampling points is the first distance;
[0020] The distance between the tap of an observation point and the tap of an adjacent sampling point is the second spacing;
[0021] The second spacing is twice the first spacing.
[0022] Based on further improvements to the above-mentioned device, the first operational amplifier and the second operational amplifier adopt the ADA4895 model, and the comparator adopts the AD8561 model.
[0023] Based on further improvements to the above-mentioned device, the discharge positioning device also includes a visualization screen;
[0024] The visualization screen is connected to the positioning module and is used to receive and display the discharge positioning position of the discharge device.
[0025] Based on further improvements to the above-mentioned device, the discharge positioning device also includes a statistics module and an analysis module;
[0026] The statistics module is connected to the positioning module and is used to receive the discharge positioning position obtained by the positioning module and count the discharge frequency of each discharge positioning position.
[0027] The analysis module determines the fault location of the discharge device based on the discharge frequency at each discharge location.
[0028] Based on a further improvement to the above device, the step of counting multiple input discharge pulse signals according to multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal includes:
[0029] For each discharge pulse signal, a counter with the same number of counting clocks is used to count it simultaneously; wherein, each counter counts under the action of one counting clock.
[0030] The count results of each discharge pulse signal are summed with the count results of the counters in all counting clocks to obtain the count result of each discharge pulse signal;
[0031] The time when each antenna receives the original partial discharge signal is determined based on the counting results of each discharge pulse signal.
[0032] Based on a further improvement of the above-mentioned device, the step of locating the discharge position of the discharge device according to the time when each antenna receives the original partial discharge signal and the position of each antenna includes:
[0033] Identify all corresponding antenna combinations among multiple antennas; where each antenna combination includes four antennas;
[0034] Based on the antenna positions in each antenna combination and the time when the original partial discharge signal was received, the possible discharge location corresponding to each antenna combination is determined.
[0035] Calculate the average of the possible discharge locations corresponding to all antenna combinations, and use this average as the discharge location of the discharge device.
[0036] Based on further improvements to the above-mentioned device, the possible discharge locations corresponding to each antenna combination are determined using the following formulas, including:
[0037]
[0038] Where x1, y1, and z1 represent the position coordinates of the first antenna in the antenna combination, x2, y2, and z2 represent the position coordinates of the second antenna in the antenna combination, x3, y3, and z3 represent the position coordinates of the third antenna in the antenna combination, x4, y4, and z4 represent the position coordinates of the fourth antenna in the antenna combination, x, y, and z represent the possible discharge location corresponding to the antenna combination, c represents the speed of light, and t1, t2, t3, and t4 represent the time when the first to fourth antennas in the antenna combination receive the original partial discharge signal, respectively.
[0039] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:
[0040] 1. By deploying multiple antennas around the discharge equipment, the discharge signal received by the antennas is demodulated using an envelope detector to obtain a low-frequency detection signal. A specially designed shaping circuit is used to process the demodulated low-frequency detection signal to obtain the discharge pulse signal corresponding to the discharge signal. Then, a low-cost FPGA is used to determine the time when each antenna receives the discharge signal based on the phase shift processing of the source clock. Based on the position of each antenna and the time of the discharge signal, the discharge position of the discharge equipment is calculated, which realizes low-cost detection of the discharge equipment and the calculated discharge positioning position has higher accuracy.
[0041] 2. The low-frequency detection signal is converted into a discharge pulse signal by a shaping circuit. By setting multiple sampling points on the printed line, a dynamic reference voltage is obtained, which makes the reference voltage setting of each observation point more reasonable and accurate, thereby ensuring the accuracy of the discharge pulse signal. Ultimately, the time accuracy of the discharge signal received by each antenna is higher, thereby further improving the accuracy of the calculated discharge position.
[0042] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description
[0043] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.
[0044] Figure 1 This is a schematic diagram of the structure of a discharge positioning device for a discharge device provided in an embodiment of the present invention;
[0045] Figure 2This is a planar schematic diagram showing four antennas arranged around a discharge device according to an embodiment of the present invention;
[0046] Figure 3 This is a schematic diagram illustrating the changes in the original partial discharge signal provided in an embodiment of the present invention;
[0047] Figure 4 This is a schematic diagram of the shaping circuit provided in an embodiment of the present invention;
[0048] Figure 5 This is a schematic diagram illustrating the working principle of the shaping circuit provided in an embodiment of the present invention;
[0049] Figure 6 This is a schematic diagram illustrating the principle of counting via phase shifting of the source clock of an FPGA, as provided in an embodiment of the present invention. Detailed Implementation
[0050] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.
[0051] A specific embodiment of the present invention discloses a discharge positioning device for a discharge device, such as... Figure 1 As shown, the discharge positioning device includes:
[0052] Multiple antennas are deployed around the discharge device to receive the original partial discharge signal emitted by the discharge device and output multiple antenna signals.
[0053] Multiple envelope detectors, each connected to an antenna, are used to demodulate the antenna signal and output a low-frequency detection signal.
[0054] Multiple shaping circuits, each connected to an envelope detector, are used to process low-frequency detection signals and output discharge pulse signals to the FPGA;
[0055] The FPGA is used to count each input discharge pulse signal according to multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal; wherein, the multiple counting clocks are obtained by phase shifting the source clock of the FPGA.
[0056] The positioning module is used to locate the discharge position of the discharge device based on the time when each antenna receives the original partial discharge signal and the position of each antenna, so as to obtain the discharge positioning position of the discharge device.
[0057] Specifically, such as Figure 1As shown, the discharge positioning device includes multiple antennas, multiple envelope detectors, multiple shaping circuits, an FPGA, and a positioning module. Each antenna has its corresponding connected envelope detector and shaping circuit.
[0058] Specifically, multiple antennas are deployed around the discharge device to detect it. The position of each antenna is fixed, and multiple antennas are used to receive the partial discharge signals emitted by the discharge device.
[0059] It is worth noting that when the discharge equipment experiences insulation degradation, it emits a partial discharge signal, which can be received by multiple antennas deployed around the equipment. Understandably, when a fault occurs at a certain location within the discharge equipment, a partial discharge signal is emitted, and each antenna can receive this signal separately. Because each antenna is at a different distance from the fault location, the time it takes for each antenna to receive the partial discharge signal will be slightly different, and the signal quality will also vary slightly.
[0060] For example, such as Figure 2 As shown, the area where the discharge device is located is a square area. Four antennas are deployed around the discharge device. When a partial discharge signal is emitted from the fault location in the area where the discharge device is located, all four antennas can receive the original partial discharge signal and obtain the four antenna signals.
[0061] It is understandable that the original partial discharge signal received by multiple antennas is an instantaneous discharge with high instantaneous energy and a wide frequency band distribution.
[0062] Preferably, the number of antennas is four or more.
[0063] Specifically, the more antennas there are, the higher the hardware cost will be. For general discharge equipment testing, only four antennas are needed to meet the required accuracy.
[0064] Specifically, such as Figure 1 As shown, each envelope detector is connected to a corresponding antenna to receive the antenna signal output by that antenna. The envelope detector demodulates each antenna signal to obtain multiple low-frequency detection signals.
[0065] like Figure 3 As shown, after receiving the original partial discharge signal, each antenna obtains the antenna signal corresponding to that antenna. Each antenna is connected to an envelope detector, which converts the antenna signal into a low-frequency detection signal.
[0066] Preferably, the envelope detector is model AD8317, which detects the input broadband antenna signal to form a low-frequency detection signal, i.e., a low-frequency detection signal.
[0067] It is understandable that each antenna is connected to a corresponding envelope detector. That is, the number of envelope detectors is equal to the number of antennas to transform the antenna signals and obtain the corresponding number of low-frequency detection signals.
[0068] Specifically, such as Figure 1 As shown, each shaping circuit is connected to an envelope detector. Each shaping circuit processes each low-frequency detection signal to obtain the corresponding discharge pulse signal.
[0069] like Figure 3 As shown, the low-frequency detection signal of each antenna needs to be processed by a shaping circuit to obtain the corresponding discharge pulse signal of that antenna.
[0070] Preferably, the shaping circuit includes a printed line delay circuit, a first operational amplifier, a second operational amplifier, and a comparator;
[0071] The input terminal of the printed line delay circuit is connected to an envelope detector to receive low-frequency detection signals and output the voltage and reference voltage at each observation point in the low-frequency detection signal.
[0072] The first operational amplifier and the second operational amplifier amplify the voltage and reference voltage at each observation point and output them to the comparator.
[0073] The comparator sequentially compares the voltage at each observation point with the reference voltage, and outputs a discharge pulse signal based on the comparison results.
[0074] Specifically, such as Figure 4 As shown, the printed line delay circuit is connected to the envelope detector, and the low-frequency detection signal is input to the shaping circuit. The low-frequency detection signal generates the voltage and reference voltage at each observation point through the printed line delay circuit. The voltage and reference voltage at each reference point are amplified by the first operational amplifier and the second operational amplifier, respectively, and then input to the comparator. The comparator compares the voltage and reference voltage at the reference point and outputs a discharge pulse signal according to the comparison results.
[0075] Preferably, the printed line delay circuit includes printed lines and multiple voltage divider resistors;
[0076] A tap for the observation point is set at the center of the printed line, and the tap for the observation point is connected to the first operational amplifier;
[0077] The same number of sampling point taps are set on both sides of the center of the printed line, and each sampling point tap is connected to the second operational amplifier through a voltage divider resistor.
[0078] Specifically, such as Figure 4As shown, a tap for the observation point is set at the center of the printed line, and the voltage of the observation point obtained by the observation point tap is input to the first operational amplifier. An equal number of sampling point taps are set on both sides of the printed line, and the voltage of each sampling point tap is reduced by a preset multiple through a voltage divider resistor to obtain the reduced voltage of the sampling point.
[0079] It is worth noting that the number of taps for the sampling points is a preset number. Since one end of each voltage divider resistor is connected to the second operational amplifier, it is equivalent to finally combining the voltages of each reduced sampling point to obtain the reference voltage. It can be understood that by connecting one end of each voltage divider resistor to the tap of each sampling point, the other ends of each voltage divider resistor are combined together, which is equivalent to achieving the effect of averaging the voltage of the sampling points.
[0080] Specifically, such as Figure 4 As shown, the low-frequency detection signal is sampled at each sampling point based on the printed line delay to obtain the sampling point voltage. Centered on the measurement point, each tap utilizes the printed line delay to achieve a delay of 200ps. On both sides of the measurement point, there are 400ps protection units, meaning that no sampling points are set within a range of approximately 400ps from the measurement point.
[0081] It is worth noting that, in order to better compare the voltage at the observation point with the reference voltage and improve the accuracy of the discharge pulse sub-signal, the voltage at the observation point and the reference voltage are amplified before being input into the comparator, and the amplified voltage at the observation point and the reference voltage are then input into the comparator.
[0082] Specifically, the reference voltage and the voltage at the observation point are fine-tuned by using an operational amplifier, that is, a balance is found between detection sensitivity and false detection probability.
[0083] Preferably, the operational amplifier chip is the ADA4895 model, and the comparator chip is the AD8561 model.
[0084] Specifically, such as Figure 5 The schematic diagram of the shaping circuit shown uses a printed line delay circuit to process the low-frequency detection signal. In terms of data processing effect, it is equivalent to performing sliding window processing on the low-frequency detection signal, such as... Figure 5 The window shown has the center point D of the printed line as the observation point, the adjacent observation point D as the protection unit P, and X1, X2, Xn-1, X, Xn+1, XN as the sampling points in the window. The low-frequency detection signal is processed by sliding window, and the average voltage of the signal in the window is used as the reference voltage corresponding to the observation point. The average voltage in the window is the average voltage of all sampling points in the window.
[0085] It is worth noting that when the low-frequency detection signal is windowed, the reference voltage corresponding to different observation points is different. By generating corresponding reference voltages for different observation points through different windows, the voltage of the observation point corresponding to one window and the reference voltage are input to the comparator to obtain the discharge pulse sub-signal for that observation point. By continuously performing windowing processing on the low-frequency detection signal, multiple discharge pulse sub-signals can be obtained, and all the discharge pulse sub-signals form the discharge pulse signal corresponding to the antenna.
[0086] Specifically, such as Figure 5 As shown, the voltage and reference voltage at observation point D are input to the comparator through the first operational amplifier and the second operational amplifier, respectively. The comparator compares the voltage at the observation point with the reference voltage and generates a discharge pulse sub-signal based on the comparison result. The discharge pulse sub-signal corresponding to the observation point of each low-frequency detection signal forms the discharge pulse signal corresponding to that low-frequency detection signal.
[0087] Specifically, such as Figure 5 As shown, the same number of sampling points are set on the left and right sides of observation point D respectively.
[0088] Preferably, such as Figure 5 As shown, the distance between the taps of two adjacent sampling points is the first distance;
[0089] The distance between the tap of an observation point and the tap of an adjacent sampling point is the second spacing;
[0090] The second spacing is twice the first spacing.
[0091] Specifically, such as Figure 5 As shown, the number of sampling points X1, X2, ..., Xn-1 and sampling points Xn+1, Xn+2, ..., XN are the same, and except for the spacing between sampling points Xn-1 and Xn+1, the spacing between other adjacent sampling points is the first spacing, and all the first spacings are the same.
[0092] Specifically, the sampling interval between observation point D and adjacent sampling points Xn-1 and Xn+1 is the second interval, and the second interval is twice the first interval. The protection unit P is not used as a sampling point.
[0093] By setting up a protection unit, it is ensured that the reference voltage and the voltage at the observation point will not affect each other, thereby improving the accuracy of the obtained voltage at the observation point and the reference voltage, and further improving the generation accuracy of the discharge pulse sub-signal.
[0094] Specifically, such as Figure 1As shown, in the FPGA, the source clock of the FPGA is phase-shifted to obtain multiple counting clocks with different phases. Each discharge pulse signal is counted using multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal.
[0095] Specifically, such as Figure 3 As shown, the discharge pulse signals corresponding to multiple antennas are simultaneously input into the FPGA, and the FPGA is used to determine the time when each antenna receives the original partial discharge signal.
[0096] Specifically, such as Figure 6 As shown, if the source clock of the FPGA is a 300MHz clock, by shifting the phase by 45°, 90°, 135°, 180°, 225°, 270°, and 315°, plus the clock itself (considered as a 0° phase shift), eight counting clocks with different phases, CLK1, CLK2, CLK3, ..., CLK8, can be formed. These eight counting clocks are used to count each discharge pulse signal.
[0097] Preferably, the step of using multiple counting clocks to count each discharge pulse signal to obtain the time when each antenna receives the original partial discharge signal includes:
[0098] For each discharge pulse signal, a counter with the same number of counting clocks is used to count it simultaneously; wherein, each counter counts under the action of one counting clock.
[0099] The count results of each discharge pulse signal are summed with the count results of the counters in all counting clocks to obtain the count result of each discharge pulse signal;
[0100] The time when each antenna receives the original partial discharge signal is determined based on the counting results of each discharge pulse signal.
[0101] Specifically, such as Figure 6 As shown, for the input pulse, that is, the discharge pulse signal corresponding to each antenna, the discharge pulse signal corresponding to each antenna is counted by 8 counters at counting clocks CLK1, CLK2, CLK3, ..., CLK8, and each counter corresponds to a counting clock.
[0102] It is worth noting that if there are 4 antennas, there will be 4 discharge pulse signals. Each discharge pulse signal requires 8 counters, so a total of 32 counters are needed.
[0103] Specifically, such as Figure 6As shown, the count results of the eight counters corresponding to each discharge pulse signal are added together to obtain the count result of the discharge pulse signal. The output count is the count result corresponding to the discharge pulse signal. The time when each antenna receives the original partial discharge signal is determined based on the count result of each discharge pulse signal.
[0104] like Figure 6 As shown, it is worth noting that the counting intervals of each counter are the same. By combining the counting result ∑ of the discharge pulse signal with the result of the counter, the time when the original partial discharge signal was received can be obtained.
[0105] like Figure 1 As shown, in step S5, the discharge position of the discharge device is located based on the time when each antenna receives the original partial discharge signal and the position of each antenna.
[0106] Preferably, the step of locating the discharge location of the discharge device based on the time when each antenna receives the original partial discharge signal and the positions of multiple antennas includes:
[0107] Identify all corresponding antenna combinations among multiple antennas; where each antenna combination includes four antennas;
[0108] Based on the antenna positions in each antenna combination and the time when the original partial discharge signal was received, the possible discharge location corresponding to each antenna combination is determined.
[0109] Calculate the average of the possible discharge locations corresponding to all antenna combinations, and use this average as the discharge location of the discharge device.
[0110] Specifically, four antennas are considered as one antenna combination, and all antenna combinations are determined by combining the number of multiple antennas used.
[0111] Preferably, the possible discharge locations corresponding to each antenna combination are determined by the following formula, including:
[0112]
[0113] Where x1, y1, and z1 represent the position coordinates of the first antenna in the antenna combination, x2, y2, and z2 represent the position coordinates of the second antenna in the antenna combination, x3, y3, and z3 represent the position coordinates of the third antenna in the antenna combination, x4, y4, and z4 represent the position coordinates of the fourth antenna in the antenna combination, x, y, and z represent the possible discharge location corresponding to the antenna combination, c represents the speed of light, and t1, t2, t3, and t4 represent the time when the first to fourth antennas in the antenna combination receive the original partial discharge signal, respectively.
[0114] Specifically, the above formula can be used to determine the possible discharge location for each antenna combination. Finally, the average value of the possible discharge locations for all antenna combinations is calculated as the discharge location of the discharge device.
[0115] Understandably, the more antennas used, the higher the accuracy of the calculated discharge location, and the better it reflects the fault location that emitted the partial discharge signal.
[0116] After obtaining the discharge location of the discharge equipment, users can refer to this location to assess the fault of the discharge equipment and carry out timely maintenance.
[0117] Preferably, such as Figure 1 As shown, the discharge positioning device also includes a visualization screen;
[0118] The visualization screen is connected to the positioning module and is used to receive and display the discharge positioning position of the discharge device.
[0119] The discharge positioning device also includes a statistics module and an analysis module;
[0120] The statistics module is connected to the positioning module and is used to receive the discharge positioning position obtained by the positioning module and count the discharge frequency of each discharge positioning position.
[0121] The analysis module determines the fault location of the discharge device based on the discharge frequency at each discharge location.
[0122] Specifically, such as Figure 1 As shown, the positioning module can determine the discharge location of the discharge device each time it emits a partial discharge signal. Combined with the visualization screen, the discharge location of the discharge device each time it emits a partial discharge signal is displayed, which is convenient for users to view and improves the efficiency of detection.
[0123] like Figure 1 As shown, a statistics module and an analysis module are set in the discharge positioning device to statistically analyze the discharge frequency of the discharge equipment at different locations, determine the fault location of the discharge equipment, improve the intelligence of discharge equipment detection, and improve detection efficiency.
[0124] Compared with existing technologies, the discharge positioning device for a discharge device provided in this embodiment of the invention deploys multiple antennas around the discharge device, demodulates the discharge signal received by the antennas using an envelope detector to obtain a low-frequency detection signal, processes the demodulated low-frequency detection signal using a specially designed shaping circuit to obtain a discharge pulse signal corresponding to the discharge signal, and then uses a low-cost FPGA based on source clock phase shifting processing to determine the time when each antenna receives the discharge signal, and then calculates the discharge position of the discharge device based on the position of each antenna and the time of the discharge signal, thus achieving low-cost detection of the discharge device, and the calculated discharge positioning position is more accurate. At the same time, the low-frequency detection signal is transformed into a discharge pulse signal by the shaping circuit, and multiple sampling points are set on the printed line to obtain a dynamic reference voltage, so that the reference voltage setting of each observation point is more reasonable and accurate, thereby ensuring the accuracy of the discharge pulse signal, and finally making the time accuracy of the discharge signal received by each antenna higher, thereby further improving the accuracy of the calculated discharge position.
[0125] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.
[0126] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A discharge positioning device for a discharge apparatus, characterized in that, The discharge positioning device includes: Multiple antennas are deployed around the discharge device to receive the original partial discharge signal emitted by the discharge device and output multiple antenna signals. Multiple envelope detectors, each connected to an antenna, are used to demodulate the antenna signal and output a low-frequency detection signal. Multiple shaping circuits, each connected to an envelope detector, are used to process low-frequency detection signals and output discharge pulse signals to the FPGA; The FPGA is used to count each input discharge pulse signal according to multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal; wherein, the multiple counting clocks are obtained by phase shifting the source clock of the FPGA. The positioning module is used to locate the discharge position of the discharge device based on the time when each antenna receives the original partial discharge signal and the position of each antenna, so as to obtain the discharge positioning position of the discharge device.
2. The discharge positioning device according to claim 1, characterized in that, The shaping circuit includes a printed line delay circuit, a first operational amplifier, a second operational amplifier, and a comparator; The input terminal of the printed line delay circuit is connected to an envelope detector to receive low-frequency detection signals and output the voltage and reference voltage at each observation point in the low-frequency detection signal. The first operational amplifier and the second operational amplifier amplify the voltage and reference voltage at each observation point and output them to the comparator. The comparator sequentially compares the voltage at each observation point with the reference voltage, and outputs a discharge pulse signal based on the comparison results.
3. The discharge positioning device according to claim 2, characterized in that, The printed line delay circuit includes printed lines and multiple voltage divider resistors; A tap for the observation point is set at the center of the printed line, and the tap for the observation point is connected to the first operational amplifier; The same number of sampling point taps are set on both sides of the center of the printed line, and each sampling point tap is connected to the second operational amplifier through a voltage divider resistor.
4. The discharge positioning device according to claim 3, characterized in that, The distance between the taps of two adjacent sampling points is the first distance; The distance between the tap of an observation point and the tap of an adjacent sampling point is the second spacing; The second spacing is twice the first spacing.
5. The discharge positioning device according to claim 2, characterized in that, The first and second operational amplifiers are of the ADA4895 model, and the comparator is of the AD8561 model.
6. The discharge positioning device according to claim 1, characterized in that, The discharge positioning device also includes a visualization screen; The visualization screen is connected to the positioning module and is used to receive and display the discharge positioning position of the discharge device.
7. The discharge positioning device according to claim 6, characterized in that, The discharge positioning device also includes a statistics module and an analysis module; The statistics module is connected to the positioning module and is used to receive the discharge positioning position obtained by the positioning module and count the discharge frequency of each discharge positioning position. The analysis module determines the fault location of the discharge device based on the discharge frequency at each discharge location.
8. The discharge positioning device according to claim 1, characterized in that, The step of counting multiple input discharge pulse signals according to multiple counting clocks to obtain the time when each antenna receives the original partial discharge signal includes: For each discharge pulse signal, a counter with the same number of counting clocks is used to count it simultaneously; wherein, each counter counts under the action of one counting clock. The count results of each discharge pulse signal are summed with the count results of the counters in all counting clocks to obtain the count result of each discharge pulse signal; The time when each antenna receives the original partial discharge signal is determined based on the counting results of each discharge pulse signal.
9. The discharge positioning device according to claim 8, characterized in that, The step of locating the discharge location of the discharge device based on the time when each antenna receives the original partial discharge signal and the position of each antenna includes: Identify all corresponding antenna combinations among multiple antennas; where each antenna combination includes four antennas; Based on the antenna positions in each antenna combination and the time when the original partial discharge signal was received, the possible discharge location corresponding to each antenna combination is determined. Calculate the average of the possible discharge locations corresponding to all antenna combinations, and use this average as the discharge location of the discharge device.
10. The discharge positioning device according to claim 9, characterized in that, The possible discharge locations for each antenna combination are determined using the following formulas, including: Where x1, y1, and z1 represent the position coordinates of the first antenna in the antenna combination, x2, y2, and z2 represent the position coordinates of the second antenna in the antenna combination, x3, y3, and z3 represent the position coordinates of the third antenna in the antenna combination, x4, y4, and z4 represent the position coordinates of the fourth antenna in the antenna combination, x, y, and z represent the possible discharge location corresponding to the antenna combination, c represents the speed of light, and t1, t2, t3, and T4 represent the time when the first to fourth antennas in the antenna combination receive the original partial discharge signal, respectively.