CN116260486A - Envelope sensor data upload method, envelope sensor and fusion detection system - Google Patents

Abstract

The present invention provides an envelope sensor data upload method, an envelope sensor and a fusion detection system. The envelope sensor data upload method includes: receiving a partial discharge pulse signal within the monitoring range of the envelope sensor, and extracting from the partial discharge pulse signal Generate a pulse envelope signal; generate a pseudo pulse sequence according to the pulse envelope signal; 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. When the envelope sensor detects a PD pulse, it uploads the detected pulse information by transmitting a pre-specified pseudo pulse sequence. Utilizing the characteristics of the steep rising edge of the pseudo-broadband pulse, easy to be detected and located, and the pulse detection function of the broadband sensor itself, the envelope sensor uploads the pulse signal strength in a simple, low-cost, reliable, accurate, and almost delay-free manner. and pulse arrival time information.

Description

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

technical field

The invention relates to the technical field of intelligent measurement and perception, in particular to an envelope sensor data upload method, an envelope sensor and a fusion detection system.

Background technique

Partial discharge (PD) is an early sign of possible insulation failure of grid equipment. Detection and location of partial discharge signals is a widely used online monitoring and intelligent predictive maintenance method for power grids.

PD detection and positioning based on broadband radio wireless sensing technology has significant advantages such as non-contact signal acquisition, flexible on-site deployment, wide spatial coverage and high sensitivity, and is widely used in the partial discharge live detection of power grid equipment.

A typical broadband radio frequency partial discharge detection and location method is to use a fusion detection system to detect and locate partial discharge 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 passes through Wireless and wired communication collect sensory data for fusion analysis and partial discharge detection and location to obtain the location of the partial discharge source. The fusion detection system can not only ensure the reliable identification of partial discharge signals and pulse interference signals, but also enable the envelope sensor to have the ability to generate different pulse sources by synchronizing the pulse time detected by the broadband sensor and the envelope sensor. The pulse resolution capability enhances the anti-interference capability, thus expanding the coverage and depth of fusion detection.

However, in the process of detecting and locating PD signals, the fusion detection system needs the envelope sensor to upload the detected PD characteristic information, such as PD signal strength and PD arrival time, to the (fusion) sensing data processing and analysis unit . However, the current fusion detection system does not propose a specific upload method for the PD detection data of the envelope sensor, which leads to the limitation of further research on the PD detection and positioning method of the fusion broadband sensor and the envelope sensor.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect of not proposing a specific upload method for envelope sensor partial discharge detection data in the fusion detection system in the prior art, thereby providing an envelope sensor data upload method, envelope sensor and Fusion detection system.

To achieve the above object, the present invention provides the following technical solutions:

In the first aspect, an embodiment of the present invention provides a method for uploading envelope sensor data, including:

receiving a PD pulse signal within the monitoring range of the envelope sensor, and extracting a pulse envelope signal from the PD pulse signal;

generating a pseudo-pulse sequence based on the pulse envelope signal;

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.

Optionally, the data processing and analysis unit calculates the arrival time of the pulse envelope signal detected by the envelope sensor according to the pulse detection time and the arrival time of the first false 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.

Optionally, the time interval is a constant interval.

Optionally, the pseudo-pulse sequence includes a beacon and an RSSI code, both the beacon and the RSSI code are composed of a plurality of pseudo-pulses, and the pseudo-pulses are broadband radio frequency pulses.

Optionally, the data processing and analyzing unit judges whether the beacon exists by comparing the detected arrival time difference of two adjacent pulse signals.

Optionally, when the beacon is detected, the data processing and analyzing unit demodulates and decodes the next preset number of false pulses to obtain the signal strength of the pulse envelope signal.

In the second aspect, the embodiment of the present invention provides an envelope sensor, which is used to implement the envelope sensor data uploading method in the first aspect of the embodiment of the present invention.

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,

The first radio frequency antenna is used to receive PD pulse signals within the monitoring range of the envelope sensor;

The first analog front-end unit is configured to process the PD pulse signal;

The envelope detection unit is configured to extract a pulse envelope signal from the PD pulse signal;

The sampling unit is configured 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 configured to detect the signal strength of the pulse envelope signal and the arrival time of the pulse envelope signal;

The control unit is configured to control the signal strength coding unit and the pseudo pulse sequence modulation unit to modulate and code 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 The pseudo-pulse sequence is sent to a broadband sensor.

Optionally, the frequency receiving ranges of the first radio frequency antenna and the first analog front-end unit cover the main frequency spectrum of the PD pulse signal.

In the 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,

The envelope sensor is used to implement the envelope sensor data upload method of the first aspect of the embodiment of the present invention, and transmit the pseudo pulse sequence to the broadband sensor through wireless;

The broadband sensor is used to acquire 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 through cable;

The data processing and analysis unit is configured to perform fusion analysis according to the pulse waveform sampling data and the pseudo-pulse sequence to obtain the position of the partial discharge source.

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

In the fifth aspect, the embodiments of the present invention provide a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions are used to make the computer execute the envelope of the first aspect of the embodiments of the present invention Sensor data upload method.

The technical solution of the present invention has the following advantages:

1. A method for uploading data of an envelope sensor provided by the present invention, comprising: receiving a PD pulse signal within the monitoring range of the envelope sensor, extracting a pulse envelope signal from the PD pulse signal; generating a pseudo signal according to the pulse envelope signal A pulse sequence; the pseudo pulse sequence is sent to the broadband sensor, and the broadband sensor uploads the pseudo pulse sequence to the data processing and analysis unit. When the envelope sensor detects a PD pulse, it uploads the detected pulse information by transmitting a pre-specified pseudo pulse sequence. Utilizing the characteristics of the steep rising edge of the pseudo-broadband pulse, easy to be detected and located, and the pulse detection function of the broadband sensor itself, the envelope sensor uploads the pulse signal strength in a simple, low-cost, reliable, accurate, and almost delay-free manner. and pulse arrival time information.

2. The envelope sensor provided by the present invention uploads the pulse signal strength and pulse arrival time to the broadband sensor by generating a pseudo-pulse sequence after detecting a pulse. Utilizing the characteristics of the steep rising edge of the pseudo-broadband pulse, easy to be detected and located, and the pulse detection function of the broadband sensor itself, the envelope sensor uploads the pulse signal strength in a simple, low-cost, reliable, accurate, and almost delay-free manner. and pulse arrival time information.

3. A fusion detection system provided by the present invention, comprising: a broadband sensor, a data processing and analysis unit, and an envelope sensor, wherein the envelope sensor is used to implement the envelope sensor data upload method of the first aspect of the embodiment of the present invention, Send the pseudo-pulse sequence to the broadband sensor wirelessly; the broadband sensor is used to obtain the 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 through cable; the data processing and analysis unit , which is used for fusion analysis based on the pulse waveform sampling data and pseudo-pulse sequence to obtain the position of the PD source. Make full use of the inherent broadband pulse detection capability of the broadband sensor, adopt the in-band signaling method, transmit the pseudo-pulse sequence through the envelope sensor, receive and upload the pseudo-pulse sequence by the broadband sensor, and complete the wireless upload of the pulse signal strength detected by the envelope sensor and the information task of the pulse arrival time.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a flow chart of a specific example of an envelope sensor data uploading method in Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of constructing a pseudo-pulse sequence in Embodiment 1 of the present invention;

3 is a schematic diagram of a beacon construction example of a pseudo-pulse sequence in Embodiment 1 of the present invention;

Fig. 4 is a structural framework diagram of an envelope sensor in Embodiment 2 of the present invention;

5 is a schematic diagram of the pulse detection steps of the envelope sensor in Embodiment 2 of the present invention;

6 is a structural framework diagram of the fusion detection system in Embodiment 3 of the present invention;

Fig. 7 is a structural block diagram of a broadband sensor in Embodiment 3 of the present invention;

Fig. 8 is a structural block diagram of the data processing and analysis unit in Embodiment 3 of the present invention;

9 is a schematic diagram of an application case of a partial discharge detection and positioning system fused with broadband and envelope sensors in Embodiment 3 of the present invention;

Fig. 10 is a functional block diagram of a specific example of an envelope sensor data uploading device in Embodiment 4 of the present invention;

FIG. 11 is a composition diagram of a specific example of computer equipment provided by an embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

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

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically or electrically connected; it can be directly connected, or indirectly connected through an intermediary, or it can be the internal communication of two components, which can be wireless or wired connect. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example 1

An embodiment of the present invention provides a method for uploading envelope sensor data, as shown in FIG. 1 , including the following steps:

S1: Receive the PD pulse signal within the monitoring range of the envelope sensor, and extract the pulse envelope signal from the PD pulse signal.

In a specific embodiment, the envelope sensor receives a broadband radio frequency pulse signal within its monitoring range, and when the envelope sensor detects a broadband radio frequency pulse signal (such as a partial discharge pulse signal), the pulse packet is extracted from the partial discharge pulse signal network signal.

S2: Generate a pseudo-pulse sequence according to the pulse envelope signal.

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, Received Signal Strength Indicator) code, and both the beacon and the RSSI code are composed of a plurality of pseudo-pulses.

Without loss of generality, the pseudo-pulse sequence consists of a beacon and RSSI code. Wherein, as shown in FIG. 2 , the beacon consists of K pseudo-pulses, and the RSSI code consists of N pseudo-pulses, wherein the pseudo-pulses are broadband radio frequency pulses. The purpose of the beacon is to signal the presence of a pseudo pulse train. Only when a beacon is detected, the data processing and analysis unit needs 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 or absence of the beacon conveniently and reliably. Figure 3 shows a preferred beacon design. The design uses two dummy pulses (K=2) whose specific time interval T3 is the signature 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 detected arrival time difference of two adjacent pulse signals to determine whether the beacon exists, which is simple to implement. In order to further improve the reliability of beacon detection, it is also possible to further compare the signal strength difference of adjacent pseudo-pulses on the basis of time difference comparison. The most robust method is to conduct cross-correlation analysis on two adjacent pulse signals, but the implementation is much more complicated than the first two methods. Which beacon detection method is used specifically is not limited here. In principle, the smaller the T3 value, the better. Without loss of generality, in order for the false pulse corresponding to the beacon to be detected by the wideband sensor in the normal single pulse mode, T3 needs to be greater than the minimum time interval between two adjacent pulses detected by the wideband sensor. The specific time interval of the pseudo pulse sequence is not limited here.

The RSSI code consists of N pseudo-pulses. Each pseudo-pulse conveys 1-bit information, and the bit information can be realized by modulating the pseudo-pulse amplitude (Amplitude modulation, AM) or its position in a symbol time period (Pulse Position Modulation, PPM). The pseudo-pulse signal has a large bandwidth, a steep rising edge, strong anti-interference ability, and is easy to be detected. Therefore, the on/off keying (On&Off keying) amplitude modulation is the first choice to make the implementation the simplest. In order to further improve the reliability of RSSI value transmission, 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 64dB RSSI dynamic range and achieve 1dB accuracy. The specific modulation and coding design of the RSSI is not limited here.

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.

In a specific embodiment, the envelope sensor uploads the detected pulse information to the broadband sensor by transmitting 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 through the cable. 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 conducts fusion analysis according to the pulse waveform sampling data and the pseudo-pulse sequence to obtain the position of the partial discharge source.

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 emitting the pseudo-pulse sequence. Wherein, the time interval is a constant interval.

Specifically, the envelope sensor represents different pulse signal strengths through modulation and coding. In addition, after the envelope sensor detects a pulse, the time when it emits a pseudo-pulse sequence has a constant time relationship with the arrival time of the detected pulse. Therefore, when the broadband sensor detects a false pulse sequence, the data processing and analysis unit can calculate the arrival time of the pulse detected by the envelope sensor based on the arrival time of the first false pulse. Meanwhile, a TDOA (Time Difference Of Arrival, time difference of arrival) method may be used to obtain the position information of the envelope sensor. This information can further improve PD detection and localization functionality and performance. Since the spectrum of the pseudo-pulse signal is much wider than the generally receivable PD pulse or interference pulse, the broadband sensor can easily and reliably detect the pseudo-pulse sequence emitted by the envelope sensor and upload it to the data processing and analysis unit , to determine the strength and arrival time of the pulse signal 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, which improves the reliability of PD positioning.

This embodiment utilizes the characteristics of the steep rising edge of the pseudo-broadband pulse, which is easy to be detected and located, and the pulse detection function of the broadband sensor itself, to realize the uploading of the envelope sensor in a simple, low-cost, reliable, accurate, and almost no-delay manner. Pulse signal strength and pulse arrival time information. Based on the pulse arrival time difference comparison method, the pulse classification of the envelope sensor based on the pulse classification result of the broadband sensor is realized, which greatly improves the anti-interference ability of the envelope sensor. And based on the estimated position information of the envelope sensor of the pseudo-pulse signal arrival time, the pulse classification result of the envelope sensor and the characteristics of the envelope sensor pulse signal intensity changing significantly with the distance, the approximate position information of the partial discharge source can be obtained to make up for the broadband system in a certain distance. In some application scenarios, due to various reasons, the partial discharge cannot be reliably located and the defects cannot be detected, and the reliability and detection range of the partial discharge positioning of the broadband system are improved as a whole.

Example 2

An embodiment of the present invention provides an envelope sensor, which is used to implement the above method for uploading envelope sensor data.

In a specific embodiment, as shown in FIG. 4, 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 train modulation unit.

Wherein, the first radio frequency antenna is used to receive PD pulse signals 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 for collecting the pulse envelope signal in the envelope detection unit, and sending 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 code 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.

In the embodiment of the present invention, the frequency receiving range of the first radio frequency antenna and the first analog front-end unit covers the main frequency spectrum of the PD pulse signal. Since the bandwidth of the pulse envelope signal is greatly reduced, it can be sampled with a frequency of several megabytes or tens of megabytes. The pulse detection unit includes the judgment of pulse existence, the determination of pulse signal strength and pulse arrival time. When a pulse is detected, the envelope sensor uploads the pulse signal strength and pulse arrival time. This embodiment proposes to transmit the pseudo-pulse sequence, and the broadband sensor receives the pseudo-pulse sequence and uploads the pseudo-pulse sequence to the data processing and analysis unit. In order to enable the broadband sensor to effectively detect "false pulse trains", the larger the bandwidth of the false pulse signal, the better. Without loss of generality, pulses with a bandwidth greater than 500 MHz may be preferred. In addition, the spectrum of the pseudo-pulse signal 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.

Further, as shown in FIG. 5 , it is a schematic diagram of the working and running of the envelope sensor. Fig. 5(a) illustrates the (partial discharge) pulse signal arriving at the envelope sensor. Fig. 5(b) shows the pulse envelope detected by the envelope sensor. Fig. 5(c) shows the pseudo-pulse sequence emitted by the envelope sensor after detecting the 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 when the envelope sensor detects the pulse to when the pseudo-pulse sequence is emitted. Therefore, T0 is also the shortest time interval for the envelope sensor to continuously detect PD pulses. In order to improve the pulse detection efficiency, T0 needs to be as small as possible.

Since the bandwidth of the pseudo-pulse is within the frequency receiving range of the first radio frequency antenna, a time-division multiplexing mechanism can be used to use the same radio frequency antenna to receive pulses and send pseudo-wideband pulse sequences, and the required switching signals are provided by the control unit, as shown in Figure 4.

Example 3

An embodiment of the present invention provides a fusion detection system, as shown in FIG. 6 , including: a broadband sensor, a data processing and analysis unit, and an envelope sensor. Wherein, the envelope sensor is used to implement the above envelope sensor data upload method, and transmit the pseudo-pulse sequence to the broadband sensor through wireless. The broadband sensor is used to acquire the 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 through a cable. The data processing and analysis unit is used to perform fusion analysis according to the pulse waveform sampling data and the pseudo-pulse sequence to obtain the position of the partial discharge source.

In a specific embodiment, the fusion detection system shown in FIG. 6 is composed of a plurality of 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 through a cable. 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 pulse arrival time. Wherein, the broadband sensor is a broadband radio frequency pulse waveform sensor, and the envelope sensor is a broadband radio frequency pulse envelope sensor.

Figure 7 is a block diagram of the broadband sensor structure. The broadband sensor is composed of a second radio frequency antenna, a second analog front-end unit, a high-speed sampling unit and a pulse detection unit. The frequency receiving range of the second radio frequency antenna and the analog front-end unit must be able to cover the main frequency spectrum of the PD pulse signal. The preferred frequency reception range is in the VHF and UHF bands, such as 50-800MHz. To ensure that the pulse shape 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 arrival time of the pulse, and the interception of the pulse waveform. Without loss of generality, it is assumed that the length of the intercepted pulse is T. The broadband sensor transmits the pulse waveform sampling data with a length T to the data processing and analysis unit through a cable. Once a broadband sensor is deployed, its location cannot be easily changed.

The core of this application is to make full use of the inherent wideband pulse detection capability of the wideband sensor, adopt the "In-BandSignaling" (in-band signaling) method, transmit the "pseudopulse sequence" through the envelope sensor, and the broadband sensor receives and uploads the pseudopulse sequence , to complete the task of wirelessly uploading the information of the pulse signal strength and pulse arrival time detected by the envelope sensor. Using this approach, the envelope sensor acts like a normal "pulse source" to the broadband sensor. Therefore, the wideband sensor detects and uploads the pseudo-pulse signal just like detecting and uploading any other wideband RF pulse signal, without any modification and without any prior knowledge. It is very simple to implement.

Fig. 8 is a structural block diagram of the data processing and analysis unit. The 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, determine whether there is a pseudo-pulse sequence by detecting the beacon. When a beacon is detected, the next N pulses are demodulated and decoded to obtain the pulse signal strength and pulse arrival time detected by the envelope sensor.

The broadband pulse detection system can use TDOA to locate the PD source. But precise positioning requires accurate and precise pulse arrival time information. However, there are many objective reasons in practical applications that will inevitably affect the accurate and precise estimation of the pulse arrival time, resulting in unreliable positioning information, mainly including:

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 transformer and bushing discharge pulse leaks to the nearby space through the bushing), so the pulse rises slowly, which is unfavorable Accurate detection of pulse arrival time;

2) Multi-path transmission causes overlapping of multiple pulse signals, which increases the difficulty of pulse arrival time detection and estimation;

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, and the pulse arrival time cannot truly reflect the distance between the pulse source and the sensor.

As shown in Figure 9, wideband sensors can detect pulses generated by PD sources and interference sources. Wideband sensors use waveform cross-correlation techniques to classify detected pulses to determine which pulses are interference and which pulses are PD. However, due to the reasons mentioned above, the broadband sensor detection system cannot reliably determine the PD location.

Envelope sensors can also detect pulses generated by PD sources and interference sources, but have no pulse classification capability. When the same pulse is detected simultaneously by the wideband sensor and the envelope sensor, the difference in the time at which the pulse arrives at the wideband sensor and the envelope sensor is small. Therefore, through the comparison of 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, and indirectly realizes the classification of the pulse detected by the envelope sensor.

In addition, the fusion system can obtain accurate position 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 relationship with the distance. The closer the envelope sensor is to the pulse source, the larger the RSSI is, and vice versa. When the portable envelope sensor is moving, according to its position information, a trajectory map of the pulse RSSI signal strength detected by the envelope sensor can be obtained, which is called an RSSI heat map. According to the change of RSSI value, it is judged that the envelope sensor is approaching or gradually moving away from the corresponding pulse source. When the RSSI value is maximum, the position of the corresponding envelope sensor on the RSSI heat map can be regarded as a rough location of the pulse source. Based on the classification results of pulses detected by the envelope sensor, a corresponding RSSI heat map for each type of pulse can be obtained. The position of the envelope sensor corresponding to the maximum 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 nearest place to the PD pulse source, the maximum RSSI value of the PD pulse can be obtained. With reference to the location information of the envelope sensor, the approximate location of the PD source can be obtained, which provides valuable information for further PD diagnosis.

The partial discharge detection system integrating fixedly deployed 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 characteristics of low cost, low power consumption, and portability of envelope sensors, and improve partial discharge detection. and positioning reliability and accuracy, and expand the coverage and depth of the partial discharge detection system.

Example 4

An embodiment of the present invention provides an envelope sensor data uploading device, as shown in FIG. 10 , including:

The extraction module 1 is configured to receive a PD pulse signal within the monitoring range of the envelope sensor, and extract a pulse envelope signal from the PD pulse signal. This module executes the method described in step S1 in Embodiment 1, which will not be repeated here.

A generating module 2, configured to generate a pseudo-pulse sequence according to the pulse envelope signal. This module executes the method described in step S2 in Embodiment 1, which will not be repeated here.

The upload module 3 is configured 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 in Embodiment 1, which will not be repeated here.

In this embodiment, when the envelope sensor detects a PD pulse, the detected pulse information is uploaded by transmitting a pre-specified pseudo pulse sequence. Utilizing the characteristics of the steep rising edge of the pseudo-broadband pulse, easy to be detected and located, and the pulse detection function of the broadband sensor itself, the envelope sensor uploads the pulse signal strength in a simple, low-cost, reliable, accurate, and almost delay-free manner. and pulse arrival time information.

Example 5

An embodiment of the present invention provides a computer device, as shown in FIG. 11 , including: at least one processor 401, such as a CPU (Central Processing Unit, central processing unit), at least one communication interface 403, memory 404, and at least one communication bus 402 . Wherein, the communication bus 402 is used to realize connection and communication between these components. Wherein, the communication interface 403 may include a display screen (Display) and 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. Optionally, the memory 404 may also be at least one storage device located away from the aforementioned processor 401 . The processor 401 may execute the method for uploading envelope sensor data in Embodiment 1. A set of program codes are stored in the memory 404 , and the processor 401 invokes the program codes stored in the memory 404 to execute the method for uploading envelope sensor data in Embodiment 1.

Wherein, the communication bus 402 may be a peripheral component interconnect standard (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like. The communication bus 402 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one line is used in FIG. 11 , but it does not mean that there is only one bus or one type of bus.

Wherein, the memory 404 may include a volatile memory (English: volatile memory), such as a random-access memory (English: random-access memory, abbreviation: RAM); the memory may also include a non-volatile memory (English: non-volatile memory), such as flash memory (English: flash memory), hard disk (English: hard diskdrive, abbreviation: HDD) or solid-state hard disk (English: solid-state drive, abbreviation: SSD); memory 404 can also include the above-mentioned types combination of memory.

Wherein, the processor 401 may be a central processing unit (English: central processing unit, abbreviated: CPU), a network processor (English: network processor, abbreviated: NP) or a combination of CPU and NP.

Wherein, the processor 401 may further include a hardware chip. The aforementioned hardware chip may be an application-specific integrated circuit (English: application-specific integrated circuit, abbreviation: ASIC), a programmable logic device (English: programmable logic device, abbreviation: PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (English: complex programmable logic device, abbreviated: CPLD), field-programmable logic gate array (English: field-programmable gate array, abbreviated: FPGA), general array logic (English: generic array logic , Abbreviation: GAL) or any combination thereof.

Optionally, the memory 404 is also used to store program instructions. The processor 401 may invoke program instructions to implement the method for uploading envelope sensor data in Embodiment 1 of the present application.

The embodiment of the present invention also provides a computer-readable storage medium, on which computer-executable instructions are stored, and the computer-executable instructions can execute the method for uploading envelope sensor data in Embodiment 1. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (Flash Memory), a hard disk (Hard Disk) Disk Drive, abbreviation: HDD) or Solid-State Drive (Solid-State Drive, SSD), etc.; the storage medium may also include a combination of the above-mentioned types of memory.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (12)

1. An envelope sensor data uploading method, comprising:

receiving a partial discharge pulse signal in the 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;

the dummy pulse sequence is sent to a broadband sensor, which uploads the dummy pulse sequence to a data processing analysis unit.

2. The method according to claim 1, wherein the data processing analysis unit calculates an arrival time of a pulse envelope signal detected by the envelope sensor based on a pulse detection time, which is a time interval between when the envelope sensor receives the pulse envelope signal and when the dummy pulse sequence is transmitted, and a first dummy pulse arrival time received by the broadband sensor.

3. The method of envelope sensor data upload of claim 2, wherein the time interval is a constant interval.

4. The method of claim 2, wherein the dummy pulse sequence comprises a beacon and an RSSI code, each of the beacon and the RSSI code comprising a plurality of dummy pulses, the dummy pulses being wideband radio frequency pulses.

5. The method according to claim 4, wherein the data processing analysis unit judges whether the beacon exists by comparing arrival time differences of two adjacent pulse signals detected.

6. The method according to claim 5, wherein the data processing analysis unit demodulates and decodes a preset number of dummy pulses next when the beacon is detected, to obtain the signal strength of the pulse envelope signal.

7. An envelope sensor for performing the envelope sensor data uploading method of any of claims 1-6.

8. The envelope sensor of claim 7, in which the envelope sensor comprises: the device 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 intensity coding unit and a pseudo pulse sequence modulation unit, wherein,

the first radio frequency antenna is used for receiving a partial discharge pulse signal in the monitoring range of the envelope sensor;

the first analog front end unit is used for processing the partial discharge pulse signal;

the envelope detection unit is used for extracting a pulse envelope signal from the partial discharge pulse signal;

the sampling unit is used for collecting the pulse envelope signal in the envelope detection unit and sending the collected pulse envelope signal to the pulse detection unit;

the pulse detection unit is used for detecting the signal intensity of the pulse envelope signal and the arrival time of the pulse envelope signal;

the control unit is used for controlling the signal intensity coding unit and the pseudo pulse sequence modulation unit to modulate and code to generate a pseudo pulse sequence according to the signal intensity of the pulse envelope signal and the arrival time of the pulse envelope signal, and transmitting the pseudo pulse sequence to the broadband sensor.

9. The envelope sensor of claim 8, wherein the frequency reception range of the first radio frequency antenna and the first analog front end unit covers a main frequency spectrum of the partial discharge pulse signal.

10. A fusion detection system, comprising: broadband sensor, data processing analysis unit and envelope sensor, wherein,

the envelope sensor for performing the envelope sensor data uploading method of any of claims 1-6, transmitting the pseudo-pulse sequence to the wideband sensor wirelessly;

the broadband sensor is used for acquiring pulse waveform sampling data, receiving the pseudo pulse sequence and uploading the pulse waveform sampling data and the pseudo pulse sequence to the data processing analysis unit through wires;

and the data processing and analyzing unit is used for carrying out fusion analysis according to the pulse waveform sampling data and the pseudo pulse sequence to obtain the position of the partial discharge source.

11. A computer device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the envelope sensor data uploading method of any of claims 1-6.

12. A computer readable storage medium storing computer instructions for causing the computer to perform the envelope sensor data uploading method of any of claims 1-6.

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