Envelope sensor data uploading method, envelope sensor and fusion detection system

Abstract

The present invention provides an envelope sensor data uploading method, an envelope sensor and a fusion detection system, the envelope sensor data uploading method comprising: receiving a partial discharge pulse signal within the monitoring range of the envelope sensor, extracting a pulse envelope signal from the partial discharge pulse signal; generating a pseudo pulse sequence according to the pulse envelope signal; sending the pseudo pulse sequence to the broadband sensor, and the broadband sensor uploading the pseudo pulse sequence to a data processing and analysis unit. When the envelope sensor detects a partial discharge pulse, it uploads the detected pulse information by emitting a pre-specified pseudo pulse sequence. By utilizing the characteristics of the steep rising edge of the pseudo broadband pulse, easy detection and positioning, and the inherent pulse detection function of the broadband sensor, the envelope sensor can upload pulse signal strength and pulse arrival time information in a simple, low-cost, reliable, accurate, and nearly delay-free manner.

Description

Technical Field

[0001] The present invention relates to the field of intelligent measurement and perception technology, and in particular to an envelope sensor data uploading method, an envelope sensor and a fusion detection system. Background Art

[0002] Partial discharge (PD) is an early sign of insulation failure in power grid equipment. Detecting and locating PD signals is a widely used method for online monitoring and intelligent predictive maintenance of power grids.

[0003] Partial discharge detection and positioning based on broadband radio frequency (Broadband radio) wireless sensing technology has significant advantages such as non-contact signal acquisition, flexible on-site deployment, wide spatial coverage and high sensitivity. It is widely used in the detection of partial discharge in power grid equipment.

[0004] A typical broadband RF PD detection and location method is to use a fusion detection system to detect and locate PD signals, that is, to synchronously integrate high-sampling-rate broadband sensors and low-cost envelope sensors to form a sensor array, and the monitoring host collects sensor data through wireless and wired communications for fusion analysis and PD detection and location to obtain the location of the PD source. The use of a fusion detection system can not only ensure the reliable identification of PD signals and pulse interference signals, but also synchronize the pulse time detected by the broadband sensor and the envelope sensor, so that the envelope sensor also has the ability to distinguish pulses generated by different pulse sources, enhances the anti-interference ability, and thus expands the coverage and depth of fusion detection.

[0005] However, in the process of PD signal detection and positioning, the fusion detection system requires the envelope sensor to upload the detected PD characteristic information, such as PD signal strength and PD arrival time, to the (fusion) sensor data processing and analysis unit. However, the current fusion detection system does not propose a specific method for uploading PD detection data of the envelope sensor, which limits further research on PD detection and positioning methods that integrate broadband sensors and envelope sensors. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the prior art fusion detection system does not propose a specific uploading method for envelope sensor partial discharge detection data, thereby providing an envelope sensor data uploading method, an envelope sensor and a fusion detection system.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a method for uploading envelope sensor data, comprising:

[0009] Receiving a partial discharge pulse signal within a monitoring range of the envelope sensor, and extracting a pulse envelope signal from the partial discharge pulse signal;

[0010] generating a pseudo pulse sequence according to the pulse envelope signal;

[0011] The pseudo pulse sequence is sent to a broadband sensor, and the broadband sensor uploads the pseudo pulse sequence to a data processing and analysis unit.

[0012] Optionally, the data processing and analysis unit calculates the arrival time of the pulse envelope signal detected by the envelope sensor based on the pulse detection time and the arrival time of the first pseudo pulse received by the broadband sensor, and the pulse detection time is the time interval between the envelope sensor receiving the pulse envelope signal and transmitting the pseudo pulse sequence.

[0013] Optionally, the time interval is a constant interval.

[0014] Optionally, the pseudo pulse sequence includes a beacon and an RSSI code, the beacon and the RSSI code are both composed of multiple pseudo pulses, and the pseudo pulses are broadband radio frequency pulses.

[0015] Optionally, the data processing and analysis unit determines whether the beacon exists by comparing the arrival time difference between two adjacent pulse signals detected.

[0016] Optionally, when the beacon is detected, the data processing and analysis unit demodulates and decodes a subsequent preset number of pseudo pulses to obtain the signal strength of the pulse envelope signal.

[0017] In a second aspect, an embodiment of the present invention provides an envelope sensor for executing the envelope sensor data uploading method of the first aspect of the embodiment of the present invention.

[0018] Optionally, the envelope sensor includes: a first radio frequency antenna, a first analog front end unit, an envelope detection unit, a sampling unit, a pulse detection unit, a control unit, a signal strength encoding unit and a pseudo pulse sequence modulation unit, wherein:

[0019] The first radio frequency antenna is used to receive the partial discharge pulse signal within the monitoring range of the envelope sensor;

[0020] The first analog front-end unit is used to process the partial discharge pulse signal;

[0021] The envelope detection unit is used to extract a pulse envelope signal from the partial discharge pulse signal;

[0022] The sampling unit is used to collect the pulse envelope signal in the envelope detection unit and send the collected pulse envelope signal to the pulse detection unit;

[0023] The pulse detection unit is used to detect the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal;

[0024] The control unit is used to control the signal strength encoding unit and the pseudo pulse sequence modulation unit to modulate and encode to generate a pseudo pulse sequence according to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal, and send the pseudo pulse sequence to the broadband sensor.

[0025] Optionally, a frequency receiving range of the first RF antenna and the first analog front-end unit covers a main frequency spectrum of the partial discharge pulse signal.

[0026] In a third aspect, an embodiment of the present invention provides a fusion detection system, including: a broadband sensor, a data processing and analysis unit, and an envelope sensor, wherein:

[0027] The envelope sensor is used to perform the envelope sensor data uploading method of the first aspect of the embodiment of the present invention, and send the pseudo pulse sequence to the broadband sensor via wireless;

[0028] The broadband sensor is used to obtain pulse waveform sampling data, receive the pseudo pulse sequence, and upload the pulse waveform sampling data and the pseudo pulse sequence to a data processing and analysis unit via a wire;

[0029] The data processing and analysis unit is used to perform fusion analysis based on the pulse waveform sampling data and the pseudo pulse sequence to obtain the location of the partial discharge source.

[0030] In a fourth aspect, an embodiment of the present invention provides a computer device, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the envelope sensor data uploading method of the first aspect of the embodiment of the present invention.

[0031] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the envelope sensor data uploading method of the first aspect of the embodiment of the present invention.

[0032] The technical solution of the present invention has the following advantages:

[0033] 1. The present invention provides an envelope sensor data uploading method, comprising: receiving a partial discharge pulse signal within the monitoring range of the envelope sensor, extracting a pulse envelope signal from the partial discharge pulse signal; generating a pseudo pulse sequence according to the pulse envelope signal; sending the pseudo pulse sequence to the broadband sensor, and the broadband sensor uploading the pseudo pulse sequence to a data processing and analysis unit. When the envelope sensor detects a partial discharge pulse, it uploads the detected pulse information by emitting a pre-specified pseudo pulse sequence. By utilizing the steep rising edge of the pseudo broadband pulse, easy detection and positioning, and the inherent pulse detection function of the broadband sensor, the envelope sensor can upload pulse signal strength and pulse arrival time information in a simple, low-cost, reliable, accurate, and nearly delay-free manner.

[0034] 2. The envelope sensor provided by the present invention generates a pseudo pulse sequence after detecting a pulse, and uploads the pulse signal strength and pulse arrival time to the broadband sensor. By taking advantage of the steep rising edge of the pseudo broadband pulse, which is easy to detect and locate, and the inherent pulse detection function of the broadband sensor, the envelope sensor can upload the pulse signal strength and pulse arrival time information in a simple, low-cost, reliable, accurate, and almost time-delay-free manner.

[0035] 3. A fusion detection system provided by the present invention comprises: a broadband sensor, a data processing and analysis unit and an envelope sensor, wherein the envelope sensor is used to execute the envelope sensor data uploading method of the first aspect of the embodiment of the present invention, and to send a pseudo pulse sequence to the broadband sensor by wireless; the broadband sensor is used to obtain pulse waveform sampling data, receive a pseudo pulse sequence, and upload the pulse waveform sampling data and the pseudo pulse sequence to the data processing and analysis unit by wire; the data processing and analysis unit is used to perform fusion analysis based on the pulse waveform sampling data and the pseudo pulse sequence to obtain the location of the partial discharge source. The broadband pulse detection capability inherent in the broadband sensor is fully utilized, and the in-band signaling method is adopted. The pseudo pulse sequence is transmitted by the envelope sensor, and the broadband sensor receives and uploads the pseudo pulse sequence, thereby completing the task of the envelope sensor wirelessly uploading the information of the pulse signal strength and pulse arrival time detected by it. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a flowchart of a specific example of the method for uploading envelope sensor data in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of constructing a pseudo pulse sequence in Example 1 of the present invention;

[0039] Figure 3 This is a schematic diagram of an example of constructing a beacon of a pseudo pulse sequence in Embodiment 1 of the present invention;

[0040] Figure 4 This is a structural framework diagram of the envelope sensor in Example 2 of the present invention;

[0041] Figure 5 Schematic diagram of envelope sensor pulse detection steps in Example 2 of the present invention;

[0042] Figure 6 This is a structural framework diagram of the fusion detection system in Example 3 of the present invention;

[0043] Figure 7 This is a structural block diagram of a broadband sensor in Embodiment 3 of the present invention;

[0044] Figure 8 This is a structural block diagram of a data processing and analysis unit in Embodiment 3 of the present invention;

[0045] Fig. 9 This is a schematic diagram of an application case of a partial discharge detection and positioning system integrating broadband and envelope sensors in Example 3 of the present invention;

[0046] Fig.10 It is a principle block diagram of a specific example of the device for uploading data of the envelope sensor in Embodiment 4 of the present invention;

[0047] Fig.11 A composition diagram of a specific example of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] Example 1

[0053] The embodiment of the present invention provides a method for uploading envelope sensor data, such as Figure 1 As shown, the following steps are included:

[0054] S1: Receive the partial discharge pulse signal within the monitoring range of the envelope sensor, and extract the pulse envelope signal from the partial discharge pulse signal.

[0055] In a specific embodiment, the envelope sensor receives a broadband RF pulse signal within its monitoring range. When the envelope sensor detects the broadband RF pulse signal (such as a partial discharge pulse signal), the envelope sensor extracts a pulse envelope signal from the partial discharge pulse signal.

[0056] S2: Generate a pseudo pulse sequence according to the pulse envelope signal.

[0057] In a specific embodiment, the envelope sensor generates a pseudo pulse sequence according to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal, wherein the pseudo pulse sequence includes a beacon and an RSSI (Received Signal Strength Indicator) code, and the beacon and RSSI code are both composed of multiple pseudo pulses.

[0058] Without loss of generality, the pseudo pulse sequence consists of a beacon and RSSI code. Figure 2 As shown, the beacon consists of K pseudo pulses, and the RSSI code consists of N pseudo pulses, where the pseudo pulse is a broadband radio frequency pulse. The purpose of the beacon is to indicate the existence of a pseudo pulse sequence. Only when the beacon is detected does the data processing and analysis unit need to demodulate and decode the next N pseudo pulses to obtain the signal strength of the pulse envelope signal. The design of the beacon should enable the data processing and analysis unit to detect the presence of the beacon both conveniently and reliably. Figure 3 A preferred beacon design is given. The design uses two pseudo pulses (K=2), and its specific time interval T3 is the mark of the beacon. Due to the large bandwidth of the pseudo pulse, its arrival time can be determined very accurately. Therefore, the data processing and analysis unit only needs to compare the arrival time difference of the two adjacent pulse signals detected to determine whether the beacon exists, which is simple to implement. In order to further improve the reliability of beacon detection, the signal strength difference of adjacent pseudo pulses can be further compared on the basis of time difference comparison. The most robust method is to perform cross-correlation analysis on two adjacent pulse signals, but the implementation is much more complicated than the first two methods. The specific beacon detection method is not limited here. In principle, the smaller the T3 value, the better. Without loss of generality, in order for the pseudo pulse corresponding to the beacon to be detected by the broadband sensor in the normal single pulse mode, T3 needs to be greater than the minimum time interval between two adjacent pulses detected by the broadband sensor. The specific time interval of the pseudo pulse sequence is not limited here.

[0059] RSSI encoding consists of N pseudo pulses. Each pseudo pulse transmits 1 bit of information, which can be realized by modulating the pseudo pulse amplitude (Amplitude modulation, AM) or its position in the code element time period (Pulse Position Modulation, PPM). Pseudo pulse signals have a large bandwidth, a steep rising edge, strong anti-interference ability, and are easy to detect. Therefore, on / off keying (On&Off keying) amplitude modulation is preferred to simplify the implementation. In order to further improve the transmission reliability of RSSI values, N bits can be further divided into N1 information bits and N2 redundant bits, N1+N2=N. The N1 value can be determined according to the dynamic range and accuracy requirements of the RSSI value. For example, N1=6 can cover a 64dB RSSI dynamic range and achieve 1dB accuracy. The specific RSSI modulation and coding design is not limited here.

[0060] S3: Send the pseudo pulse sequence to the broadband sensor, and the broadband sensor uploads the pseudo pulse sequence to the data processing and analysis unit.

[0061] In a specific embodiment, the envelope sensor uploads the detected pulse information to the broadband sensor by emitting a pseudo pulse sequence. The broadband sensor sends the pulse waveform sampling data collected by itself and the pulse information uploaded by the envelope sensor to the data processing and analysis unit via a wire. Without loss of generality, the pulse information specifically refers to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal. The data processing and analysis unit performs fusion analysis based on the pulse waveform sampling data and the pseudo pulse sequence to obtain the location of the partial discharge source.

[0062] In the embodiment of the present invention, the data processing and analysis unit calculates the arrival time of the pulse envelope signal detected by the envelope sensor according to the arrival time of the first pseudo pulse signal detected by the broadband sensor and the pulse detection time of the envelope sensor, and the pulse detection time is the time interval between the envelope sensor receiving the pulse envelope signal and transmitting the pseudo pulse sequence. The time interval is a constant interval.

[0063] Specifically, the envelope sensor represents different pulse signal strengths through modulation and coding. In addition, after the envelope sensor detects the pulse, the time when it emits the pseudo pulse sequence has a constant time relationship with the time when it detects the pulse arrival. Therefore, when the broadband sensor detects the pseudo pulse sequence, the data processing and analysis unit can calculate the arrival time of the pulse detected by the envelope sensor through the arrival time of the first pseudo pulse. At the same time, the TDOA (Time Difference Of Arrival) method can be used to obtain the envelope sensor position information. This information can further improve the partial discharge detection and positioning functions and performance. Since the pseudo pulse signal spectrum is much wider than the general receivable partial discharge pulse or interference pulse, the broadband sensor can easily and reliably detect the pseudo pulse sequence emitted by the envelope sensor, upload it to the data processing and analysis unit, and determine the pulse signal strength and arrival time uploaded by the envelope sensor. At the same time, by detecting the arrival time of the pseudo pulse sequence, the TDOA method is used to obtain the position information of the envelope sensor, thereby improving the reliability of partial discharge positioning.

[0064] This embodiment utilizes the characteristics of the steep rising edge of pseudo-broadband pulses, which are easy to detect and locate, and the inherent pulse detection function of the broadband sensor itself, to realize the envelope sensor uploading pulse signal strength and pulse arrival time information in a simple, low-cost, reliable, accurate, and almost delay-free manner. Based on the pulse arrival time difference comparison method, the envelope sensor pulse classification based on the broadband sensor pulse classification result is realized, which greatly improves the anti-interference ability of the envelope sensor. In addition, based on the envelope sensor position information estimated by the pseudo-pulse signal arrival time, the envelope sensor pulse classification result and the characteristic that the envelope sensor pulse signal strength changes significantly with distance, the approximate location information of the partial discharge source is obtained, which makes up for the defects of the broadband system in some application scenarios that the partial discharge cannot be reliably located and detected due to various reasons, and the reliability and detection range of the partial discharge positioning of the broadband system are improved as a whole.

[0065] Example 2

[0066] An embodiment of the present invention provides an envelope sensor, which is used to execute the above-mentioned envelope sensor data uploading method.

[0067] In a specific embodiment, if Figure 4 As shown, the envelope sensor includes: a first radio frequency antenna, a first analog front-end unit, an envelope detection unit, a sampling unit, a pulse detection unit, a control unit, a signal strength encoding unit and a pseudo pulse sequence modulation unit.

[0068] Among them, the first RF antenna is used to receive the partial discharge pulse signal within the monitoring range of the envelope sensor. The first analog front-end unit is used to process the partial discharge pulse signal. The envelope detection unit is used to extract the pulse envelope signal from the partial discharge pulse signal. The sampling unit is used to collect the pulse envelope signal in the envelope detection unit and send the collected pulse envelope signal to the pulse detection unit. The pulse detection unit is used to detect the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal. The control unit is used to control the signal strength encoding unit and the pseudo-pulse sequence modulation unit to modulate and encode to generate a pseudo-pulse sequence according to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal, and send the pseudo-pulse sequence to the broadband sensor.

[0069] In an embodiment of the present invention, the frequency receiving range of the first RF antenna and the first analog front-end unit covers the main spectrum of the partial discharge pulse signal. Since the bandwidth of the pulse envelope signal is greatly reduced, sampling can be performed at a frequency of several megahertz or tens of megahertz. The pulse detection unit includes the judgment of the existence of the pulse, the determination of the pulse signal strength and the pulse arrival time. When the pulse is detected, the envelope sensor uploads the pulse signal strength and the pulse arrival time. This embodiment proposes to transmit a pseudo-pulse sequence, which is received by a broadband sensor and uploaded to a data processing and analysis unit. In order for the broadband sensor to effectively detect the "pseudo-pulse sequence", the larger the bandwidth of the pseudo-pulse signal, the better. Without loss of generality, pulses with a bandwidth greater than 500MHz can be preferred. In addition, the pseudo-pulse signal spectrum needs to be within the detectable range of the broadband sensor, such as within the range of 50-800MHz. The specific design of the pseudo-pulse signal is not specifically limited here.

[0070] Furthermore, if Figure 5 As shown, this is a schematic diagram of the working operation of the envelope sensor. Figure 5 (a) Schematic diagram of the (partial discharge) pulse signal reaching the envelope sensor. Figure 5 (b) Schematic diagram of the pulse envelope detected by the envelope sensor. Figure 5 (c) Schematic diagram of the pseudo pulse sequence emitted by the envelope sensor after detecting a pulse signal. T1 is the time interval between the envelope sensor receiving the pulse signal and emitting the pseudo pulse sequence, collectively referred to as the pulse detection time, including envelope detection, RSSI signal estimation, RSSI encoding and pseudo pulse modulation. T2 represents the time length of the pseudo pulse sequence. T1 and T2 are determined according to the specific implementation of the envelope sensor and are constants. T0=T1+T2 is the time interval from the envelope sensor detecting the pulse to the completion of emitting the pseudo pulse sequence. Therefore, T0 is also the shortest time interval for the envelope sensor to continuously detect partial discharge pulses. In order to improve the efficiency of pulse detection, T0 needs to be as small as possible.

[0071] Since the pseudo pulse bandwidth is within the receiving frequency range of the first RF antenna, a time division multiplexing mechanism can be used to receive pulses and send pseudo broadband pulse sequences using the same RF antenna. The required switching signals are provided by the control unit. Figure 4 .

[0072] Example 3

[0073] The embodiment of the present invention provides a fusion detection system, such as Figure 6As shown, it includes: a broadband sensor, a data processing and analysis unit and an envelope sensor. The envelope sensor is used to execute the above-mentioned envelope sensor data uploading method, and send the pseudo pulse sequence to the broadband sensor via wireless. The broadband sensor is used to obtain pulse waveform sampling data, receive the pseudo pulse sequence, and upload the pulse waveform sampling data and the pseudo pulse sequence to the data processing and analysis unit via wire. The data processing and analysis unit is used to perform fusion analysis based on the pulse waveform sampling data and the pseudo pulse sequence to obtain the location of the partial discharge source.

[0074] In a specific embodiment, if Figure 6 The fusion detection system shown is composed of multiple broadband sensors and envelope sensors and a data processing and analysis unit. The broadband sensor uploads the pulse detection data to the data processing and analysis unit via a wire. The envelope sensor and the data processing and analysis unit are wirelessly connected. How the envelope sensor uploads the received pulse information to the data processing and analysis unit is the problem to be solved in this embodiment. Without loss of generality, the pulse information uploaded by the envelope detector specifically refers to the pulse signal strength and the pulse arrival time. Among them, the broadband sensor is a broadband RF pulse waveform sensor, and the envelope sensor is a broadband RF pulse envelope sensor.

[0075] Figure 7 This is a block diagram of the broadband sensor structure. The broadband sensor consists of a second RF antenna, a second analog front-end unit, a high-speed sampling unit, and a pulse detection unit. The frequency receiving range of the second RF antenna and the analog front-end unit must be able to cover the main spectrum of the partial discharge pulse signal. The preferred frequency receiving range is in the VHF and UHF bands, such as 50-800MHz. In order to ensure that the pulse waveform is not distorted, the sampling frequency must be at least twice the highest covered frequency. The pulse detection unit includes the judgment of the existence of the pulse, the determination of the pulse arrival time, and the interception of the pulse waveform. Without loss of generality, it is assumed that the intercepted pulse length is T. The broadband sensor transmits the pulse waveform sampling data of length T to the data processing and analysis unit via wire. Once the broadband sensor is deployed, its position will not change easily.

[0076] The core of this application is to make full use of the broadband pulse detection capability inherent in broadband sensors, adopt the "In-Band Signaling" method, transmit the "pseudo-pulse sequence" through the envelope sensor, and the broadband sensor receives and uploads the pseudo-pulse sequence, completing the envelope sensor's task of wirelessly uploading the information of the pulse signal strength and pulse arrival time detected by it. Using this method, the envelope sensor is like a normal "pulse source" to the broadband sensor. Therefore, the broadband sensor detects and uploads the pseudo-pulse signal just like detecting and uploading any other broadband RF pulse signal, without any modification and without any prior knowledge. It is very simple to implement.

[0077] Figure 8The data processing and analysis unit receives the pulse waveform sampling data detected by the broadband sensor, including the pseudo pulse sequence emitted by the envelope sensor. First, the beacon is detected to determine whether there is a pseudo pulse sequence. When the beacon is detected, the pulse signal strength and pulse arrival time detected by the envelope sensor are obtained by demodulating and decoding the next N pulses.

[0078] Broadband pulse detection systems can use TDOA to locate partial discharge sources. However, accurate positioning requires accurate and precise pulse arrival time information. However, in practical applications, there are many objective reasons that will inevitably affect the accurate and precise estimation of pulse arrival time, resulting in unreliable positioning information, mainly:

[0079] 1) The bandwidth of the pulse signal itself is very small (such as corona discharge in the air), or the high-frequency component is suppressed during the propagation of partial discharge (such as the discharge pulse of the transformer and bushing leaks into the nearby space through the bushing), so the pulse rises slowly, which is not conducive to the accurate detection of the pulse arrival time;

[0080] 2) Multipath transmission causes the overlap of multiple pulse signals, increasing the difficulty of pulse arrival time detection and estimation;

[0081] 3) There is a metal obstacle between the pulse source and the sensor. The sensor can only receive the pulse signal through refraction and reflection. The pulse arrival time cannot truly reflect the distance between the pulse source and the sensor.

[0082] like Fig. 9 As shown in Figure 1, broadband sensors can detect pulses generated by both PD sources and interference sources. Broadband sensors use waveform cross-correlation technology to classify the detected pulses to determine which pulses are from interference and which pulses are from PD. However, due to the reasons mentioned above, the broadband sensor detection system cannot reliably determine the location of PD.

[0083] Envelope sensors can also detect pulses generated by partial discharge sources and interference sources, but they do not have the ability to classify pulses. When the same pulse is detected by both a broadband sensor and an envelope sensor, the time difference between the arrival of the pulse at the broadband sensor and the envelope sensor is very small. Therefore, by comparing the pulse arrival time difference, the pulse detected by the envelope sensor can inherit the classification result of the pulse detected by the broadband sensor at the same time, indirectly realizing the classification of the pulse detected by the envelope sensor.

[0084] In addition, the fusion system can obtain the accurate location information of the envelope sensor through the accurate estimation of the arrival time of the pseudo pulse emitted by the envelope sensor and the TDOA method. When the pulse propagates in space, the pulse signal strength (RSSI) received by the sensor is inversely proportional to the square of the distance. The closer the envelope sensor is to the pulse source, the larger the RSSI, and vice versa. When the portable envelope sensor moves, a trajectory diagram of the RSSI signal strength of the pulse detected by the envelope sensor can be obtained based on its position information, which is called the RSSI heat map. According to the change of RSSI value, it is judged whether the envelope sensor is approaching or moving away from the corresponding pulse source. When the RSSI value is the largest, the position of the corresponding envelope sensor on the RSSI heat map can be regarded as a rough positioning of the pulse source. Based on the classification results of the pulses detected by the envelope sensor, the corresponding RSSI heat map of each type of pulse can be obtained. The envelope sensor position corresponding to the largest RSSI value of the heat map can be regarded as a rough positioning of the pulse source. Therefore, when the envelope sensor moves to the place closest to the partial discharge pulse source, the maximum RSSI value of the partial discharge pulse can be obtained. By referring to the position information of the envelope sensor, the approximate location of the partial discharge source can be obtained, providing valuable information for further partial discharge diagnosis.

[0085] The partial discharge detection system that integrates fixed-deployment broadband sensors and portable envelope sensors can give full play to the ability of broadband sensors to reliably identify interference and partial discharge signals and the low-cost, low-power, and portable characteristics of envelope sensors, improve the reliability and accuracy of partial discharge detection and positioning, and expand the coverage and depth of the partial discharge detection system.

[0086] Example 4

[0087] The embodiment of the present invention provides an envelope sensor data uploading device, such as Fig.10 As shown, including:

[0088] Extraction module 1 is used to receive the partial discharge pulse signal within the monitoring range of the envelope sensor and extract the pulse envelope signal from the partial discharge pulse signal. This module executes the method described in step S1 of embodiment 1, which will not be described in detail here.

[0089] The generating module 2 is used to generate a pseudo pulse sequence according to the pulse envelope signal. This module executes the method described in step S2 of embodiment 1, which will not be described in detail here.

[0090] The uploading module 3 is used to send the pseudo pulse sequence to the broadband sensor, and the broadband sensor uploads the pseudo pulse sequence to the data processing and analysis unit. This module executes the method described in step S3 of embodiment 1, which will not be described in detail here.

[0091] In this embodiment, when the envelope sensor detects a partial discharge pulse, it uploads the detected pulse information by emitting a pre-specified pseudo pulse sequence. By utilizing the characteristics of the pseudo broadband pulse with a steep rising edge, easy detection and positioning, and the broadband sensor's own pulse detection function, the envelope sensor uploads the pulse signal strength and pulse arrival time information in a simple, low-cost, reliable, accurate, and almost time-delay-free manner.

[0092] Example 5

[0093] An embodiment of the present invention provides a computer device, such as Fig.11 As shown, it includes: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, a memory 404, and at least one communication bus 402. Among them, the communication bus 402 is used to realize the connection and communication between these components. Among them, the communication interface 403 may include a display screen (Display), a keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a wireless interface. The memory 404 may be a high-speed RAM memory (Ramdom Access Memory, volatile random access memory) or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 404 may also be at least one storage device located away from the aforementioned processor 401. Among them, the processor 401 can execute the envelope sensor data upload method of Example 1. A set of program codes are stored in the memory 404, and the processor 401 calls the program code stored in the memory 404 to execute the envelope sensor data upload method of Example 1.

[0094] The communication bus 402 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.11 The fact that only one line is used in the diagram does not mean that there is only one bus or only one type of bus.

[0095] Among them, the memory 404 may include a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviated: RAM); the memory may also include a non-volatile memory (English: non-volatile memory), such as a flash memory (English: flash memory), a hard disk drive (English: hard disk drive, abbreviated: HDD) or a solid-state drive (English: solid-state drive, abbreviated: SSD); the memory 404 may also include a combination of the above types of memory.

[0096] The processor 401 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and a NP.

[0097] The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0098] Optionally, the memory 404 is also used to store program instructions. The processor 401 can call the program instructions to implement the envelope sensor data uploading method in the embodiment 1 of the present application.

[0099] The embodiment of the present invention further provides a computer-readable storage medium, on which computer-executable instructions are stored, and the computer-executable instructions can execute the envelope sensor data uploading method of embodiment 1. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0100] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A method for uploading envelope sensor data, characterized in that: include: Receiving a partial discharge pulse signal within a monitoring range of the envelope sensor, and extracting a pulse envelope signal from the partial discharge pulse signal; generating a pseudo pulse sequence according to the pulse envelope signal; sending the pseudo pulse sequence to a broadband sensor, and the broadband sensor uploading the pseudo pulse sequence to a data processing and analysis unit; The envelope sensor generates a pseudo pulse sequence according to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal, wherein the pseudo pulse sequence includes a beacon and an RSSI code, and both the beacon and the RSSI code are composed of multiple pseudo pulses.

2. The envelope sensor data uploading method according to claim 1, characterized in that: The data processing and analysis unit calculates the arrival time of the pulse envelope signal detected by the envelope sensor based on the pulse detection time and the arrival time of the first pseudo pulse received by the broadband sensor. The pulse detection time is the time interval between the envelope sensor receiving the pulse envelope signal and transmitting the pseudo pulse sequence.

3. The envelope sensor data uploading method according to claim 2, characterized in that: The time interval is a constant interval.

4. The envelope sensor data uploading method according to claim 2, characterized in that: The pseudo pulse is a broadband radio frequency pulse.

5. The envelope sensor data uploading method according to claim 4, characterized in that: The data processing and analysis unit determines whether the beacon exists by comparing the arrival time difference between two adjacent pulse signals detected.

6. The envelope sensor data uploading method according to claim 5, characterized in that: When the beacon is detected, the data processing and analysis unit demodulates and decodes the next preset number of pseudo pulses to obtain the signal strength of the pulse envelope signal.

7. An envelope sensor, characterized in that: Used to execute the envelope sensor data uploading method as described in any one of claims 1-6.

8. The envelope sensor according to claim 7, characterized in that: The envelope sensor comprises: a first radio frequency antenna, a first analog front end unit, an envelope detection unit, a sampling unit, a pulse detection unit, a control unit, a signal strength encoding unit and a pseudo pulse sequence modulation unit, wherein: The first radio frequency antenna is used to receive the partial discharge pulse signal within the monitoring range of the envelope sensor; The first analog front-end unit is used to process the partial discharge pulse signal; The envelope detection unit is used to extract a pulse envelope signal from the partial discharge pulse signal; The sampling unit is used to collect the pulse envelope signal in the envelope detection unit and send the collected pulse envelope signal to the pulse detection unit; The pulse detection unit is used to detect the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal; The control unit is used to control the signal strength encoding unit and the pseudo pulse sequence modulation unit to modulate and encode to generate a pseudo pulse sequence according to the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal, and send the pseudo pulse sequence to the broadband sensor.

9. The envelope sensor according to claim 8, characterized in that: The frequency receiving ranges of the first RF antenna and the first analog front-end unit cover the main spectrum of the partial discharge pulse signal.

10. A fusion detection system, characterized in that: include: Broadband sensor, data processing and analysis unit and envelope sensor, wherein: The envelope sensor is used to perform the envelope sensor data uploading method according to any one of claims 1 to 6, and send the pseudo pulse sequence to the broadband sensor via wireless; The broadband sensor is used to obtain pulse waveform sampling data, receive the pseudo pulse sequence, and upload the pulse waveform sampling data and the pseudo pulse sequence to a data processing and analysis unit via a wire; The data processing and analysis unit is used to perform fusion analysis based on the pulse waveform sampling data and the pseudo pulse sequence to obtain the location of the partial discharge source.

11. A computer device, characterized in that: include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the envelope sensor data uploading method described in any one of claims 1 to 6.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the envelope sensor data uploading method described in any one of claims 1-6.

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