CN218412775U - GIS equipment partial discharge monitoring system based on wireless transmission - Google Patents
GIS equipment partial discharge monitoring system based on wireless transmission Download PDFInfo
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- CN218412775U CN218412775U CN202221890969.7U CN202221890969U CN218412775U CN 218412775 U CN218412775 U CN 218412775U CN 202221890969 U CN202221890969 U CN 202221890969U CN 218412775 U CN218412775 U CN 218412775U
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Abstract
The utility model discloses a GIS equipment partial discharge monitoring system based on wireless transmission, its constitution includes: the wireless monitoring and discharging node comprises a wireless monitoring and discharging node (1), a wireless network (2), a gateway node (3) and a monitoring computer (4), wherein the wireless monitoring and discharging node (1) is installed on GIS equipment, the wireless monitoring and discharging node (1) adopts a star network topological structure for networking, the gateway node (3) is used as a central node and is connected with a plurality of wireless monitoring and discharging nodes (1), the gateway node (3) receives and processes data uploaded by the plurality of wireless monitoring and discharging nodes (1), and then transmits the data information to the monitoring computer (4) in a centralized manner. The wireless monitoring discharge node (1) is characterized in that a microprocessor is used as a control core to respectively control a discharge signal acquisition module and a wireless transceiving module. The system is applied to an Internet of things gateway based on LoRa. Enabling a group of sensors to send data to one or more gateways provides greater power savings than conventional approaches.
Description
Technical Field
The utility model relates to a GIS equipment partial discharge monitoring system technical field based on wireless transmission especially is applied to GIS equipment partial discharge monitoring system with wireless transmission.
Background
Whether the GIS equipment is reliable in operation depends on the condition of insulation defects of the GIS equipment to a great extent, and good electrical performance of the GIS equipment must be guaranteed, but due to the fact that some extremely small air gaps and fragments are left in the manufacturing process, the GIS equipment provides an innate condition for forming a partial discharge electric field, and weak partial discharge is easy to occur in a high-voltage strong-magnetic environment. The insulation performance of the GIS equipment can be seriously damaged by long-term partial discharge.
With the wide application of the GIS equipment, the defects of the GIS equipment are more and more obvious. The GIS is fully sealed, so that the fault is difficult to locate and maintain, the average power failure maintenance time after the accident is longer than that of common equipment, the power failure range is large, and the GIS is generally related to non-fault elements.
The GIS equipment on-line monitoring system is adopted to realize real-time monitoring of the working state of the GIS equipment, so that the system maintenance cost is reduced, the intelligent monitoring level is improved, and the GIS equipment on-line monitoring system has important practical application significance.
The rapid development of the technology of the Internet of things accelerates the intelligent process of all industries. The terminal and the gateway can be simultaneously carried with a Long Range Radio (LoRa) Radio frequency chip, on the basis of ensuring the transmission distance, the design effect of low power consumption is achieved, and the LoRa frequency band is a free unauthorized frequency band.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model discloses will provide a GIS equipment partial discharge monitoring system based on wireless transmission.
The specific technical scheme is as follows:
a GIS equipment partial discharge monitoring system based on wireless transmission comprises: the system comprises a wireless monitoring discharge node 1, a wireless network 2, a gateway node 3 and a monitoring computer 4. The wireless monitoring discharging node 1 is installed on GIS equipment, the wireless monitoring discharging node 1 adopts a star network topological structure for networking, the gateway node 3 is used as a central node and connected with the wireless monitoring discharging nodes 1, and the gateway node 3 receives and processes data uploaded by the wireless monitoring discharging nodes 1 and then intensively transmits the data information to the monitoring computer 4.
The wireless monitoring discharge node 1 is formed by respectively controlling a discharge signal acquisition module and a wireless transceiving module by taking a microprocessor as a control core.
And the discharge signal acquisition module transmits the signals acquired by the ultrasonic sensor to the microprocessor after A/D conversion through the signal conditioning circuit.
The hardware structure of the gateway node 3 comprises: main control chip, loRa radio frequency chip, communication module, peripheral circuit.
The technical effects of the utility model:
the system is applied to the internet of things gateway based on LoRa. Enabling a group of sensors to send data to one or more gateways, which results in greater power savings compared to conventional approaches; the gateway is a key device in the LoRa WAN and is used for relieving conflicts caused by mass terminal data uplink, and the network server and the application server are responsible for system management and related data analysis; the ultrasonic sensor is placed on the surface of the GIS shell, and the GIS shell has good ultrasonic propagation characteristics, so that the method is suitable for online detection of partial discharge of GIS equipment.
Drawings
Fig. 1 is a network topology structure diagram of a GIS device partial discharge monitoring system based on wireless transmission.
Fig. 2 is a diagram of a wireless monitoring discharge node.
Fig. 3 is a signal acquisition circuit composition.
Fig. 4 is a gateway node composition diagram.
In the figure: the system comprises a wireless monitoring discharge node 1, a wireless network 2, a gateway node 3 and a monitoring computer 4.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
1. General scheme
A GIS equipment partial discharge monitoring system based on wireless transmission comprises: the system comprises a wireless monitoring discharge node 1, a wireless network 2, a gateway node 3 and a monitoring computer 4. The wireless monitoring discharge node 1 is installed on GIS equipment, the wireless monitoring discharge node 1 adopts a star network topology structure for networking, the gateway node 3 is used as a central node and connected with the wireless monitoring discharge nodes 1, and the gateway node 3 receives and processes data uploaded by the wireless monitoring discharge nodes 1 and then intensively transmits the data information to the monitoring computer 4. As shown in fig. 1.
The wireless monitoring discharge node 1 is formed by respectively controlling a discharge signal acquisition module and a wireless transceiver module by taking a microprocessor as a control core. As shown in fig. 2.
And the discharge signal acquisition module is used for transmitting the signals acquired by the ultrasonic sensor to the microprocessor after the signals pass through the signal conditioning circuit and are subjected to A/D conversion. As shown in fig. 3.
The gateway node 3 comprises a hardware structure comprising: the device comprises a main control chip, a LoRa radio frequency chip, a communication module and a peripheral circuit. As shown in fig. 4.
LoRa technique
The technology belongs to a physical layer, and adopts a linear frequency modulation spread spectrum modulation technology, and different spread spectrum factors are mutually orthogonal. A typical LoRa WAN network structure is shown in fig. 1, in a typical LoRa WAN network, a network topology of the LoRa WAN is a star structure, and data between a terminal and a network server is forwarded by a gateway. The gateway is connected to the Internet via standard TCP/IP protocols. The operator or the person deployed network server transmits the data from the gateway to the corresponding application. The gateway is a key device in the Lo Ra WAN and is used for relieving conflicts caused by mass terminal data uplink. The network server and the application server are responsible for management of the system and relevant data analysis.
The modulation and demodulation technology adopted by the LoRa can widen the original signal, can improve the receiving sensitivity, increase the transmission distance and increase the link budget on the premise of not changing the transmitting power, and can greatly enhance the anti-interference capability and the communication performance of the wireless signal, so that the LoRa technology has two characteristics which are seemingly incompatible, namely low power consumption and long distance.
The LoRa technology successfully overcomes the problem of co-channel interference in wireless communication, that is, when a terminal signal with different frequencies is received in a time, it can perform signal receiving processing under a frequency, and the technology makes it possible to receive data from a transmitting end in parallel, and is beneficial to improving the throughput of the whole system. In addition, the LoRa technology uses Forward Error Correction (FEC) coding to enhance the reliability of information transmission. Compared with the current mainstream wireless transmission system adopting FSK and OOK modulation technologies, the LoRa wireless communication adopting the spread spectrum technology has the characteristics of longer transmission distance, larger coverage area and higher sensitivity, and can be widely operated in global free frequency bands.
3. Wireless monitoring discharge node
According to the requirements of monitoring nodes in a wireless system, the monitoring nodes acquire temperature data and send the data to a gateway after processing the temperature data. The general structure of the hardware design of the monitoring node is shown in fig. 2.
The microcontroller of the monitoring node is a core part of the node design, the collected discharge data is uploaded to the gateway after being processed by the microcontroller, and a wireless transceiver circuit applied by the uploaded data is matched with the microcontroller to meet the functional requirements, so that the microcontroller can be the brain of the monitoring node structure design. Aiming at application requirements, factors to be considered in the model selection of the singlechip in the utility model include the following aspects: 1) The functional requirements of temperature acquisition must be met; 2) The monitoring node is installed on GIS equipment, so that the monitoring node is simple in structure, convenient to install and small in size; 3) The monitoring node is not required to be maintained and replaced frequently, so that the service life is required to be long, and the low-power-consumption design of the monitoring node is required; 4) Since the gateway mounts multiple nodes, there is a case where the distance between the node and the gateway is long, and it is required that wireless communication must satisfy long-distance communication and be stable.
Considering the factors, the functions of the monitoring nodes are relatively simple, and the number of pins is small, so that most of single-chip microcomputers can meet the requirements, and the key point is low-power-consumption processing. The most widely used single-chip microcomputers with low power consumption in the current market are the STM32L series and the MSP430 of TI company.
4. Ultrasonic sensor
Temperature performance: the working power of the ultrasonic sensor is generally smaller, so that the temperature performance of the ultrasonic sensor needs to be tested under the conventional temperature, and the fluctuation of the ultrasonic sensor affected by the temperature is not large, so that the temperature performance of the ultrasonic sensor is tested. It was found by inspection that the temperature was not appreciably affected in its normal operating conditions.
Agility: the two coefficients are closely related to the electromechanical coupling coefficient, have strong correlation and are in direct proportion.
Frequency range of the sensor: although the detection by ultrasonic waves shows that heat and electromagnetic interference have little influence on the detection, high-decibel noise emitted from equipment, such as rolling bearings, mechanical operation booming, and the like, and noise and footstep sound accompanying the external environment have a greater or lesser influence on field testing. For this reason, sensors with high signal-to-noise (S/N) specifications should be chosen to reduce the negative effects. After the analysis of the valid data, the following results are obtained: the frequency of the effective sound wave signal generated by the discharge is in a low frequency band. The frequency of sound waves generated by vibration of different parts in the electric power equipment is different. Therefore, for the acquired signal to be valid, the frequency range of the sensor should typically be chosen between 30k Hz and 300k Hz.
The ultrasonic sensor is a signal input end of a GIS partial discharge ultrasonic detection system and is an important ring in the whole system, so that the selection of the sensor is very important. The selected sensor can acquire an effective discharge signal and improve the signal-to-noise ratio, and the selection of the sensor also determines the design of a filter circuit later, so that the selected ultrasonic sensor is in a proper frequency band range. If the selected frequency band is too small, valid signals may be missed; if the selected frequency band is too large, the acquired signal may contain a large number of clutter, making the signal difficult to process. Both of these conditions can have a very bad influence on the discharge monitoring.
The partial discharge online detection system generally comprises a signal preprocessing module, a digital acquisition module and a processing module. The signal preprocessing module is used for detecting products generated during partial discharge, the digital acquisition module digitalizes analog signals and transmits data to the processing system, and the processing module analyzes and calculates the data to obtain information related to partial discharge amount. The digital partial discharge detector can also be directly composed of a coupling device and a digital acquisition system without an analog signal processing front end.
The acquired ultrasonic signals are collected, amplified, filtered and biased, and then transmitted to an ADC module (analog-to-digital conversion module) of a microprocessor for sampling. As shown in fig. 3.
5. Gateway node
The performance of the control chip is crucial to the function realization of the whole gateway system. The utility model discloses well control core is responsible for control loRa module and accomplishes the receipt and the processing of terminal information, controls LTE module, ethernet module or Wi-Fi module simultaneously and accomplishes the information interaction between with the server. Therefore, the control chip needs to have strong performance to meet the requirement of processing a large amount of terminal data.
LoRa radio frequency: the SX1301 chips which are specially used for the gateway and are released by Semtech corporation are expensive, each chip is about thousands of yuan, and related technical data can be obtained only by adding LoRa alliance. Semtech corporation also introduced SX1280 and SX127X series chips with wide coverage and low power consumption, and the SX12XX series chips were primarily node chips in design, but S
The gateway of the X12XX series chip scheme is mainly low in cost, and the gateway is a particularly excellent solution for a scene with low communication frequency and low time delay requirement.
The 4G communication module EC20 adopts LTE 3GPP Rel.11 technology, backward compatibility with the existing EDGE and GSM/GPRS networks, support the multi-channel input and output technology, reduce the error rate of communication, and improve the communication quality. Finally, the utility model discloses choose E for use
C20 And (5) modules. The EC20 module supports a 1-path UART interface, and the STM32 and the EC20 module actually carry out data communication through the UART interface.
The clock chip mainly provides accurate time for the CPU so that the CPU can judge the current time period. The utility model discloses DS1307 is chooseed for use to the clock chip.
LAN8720A is a low power 10/100M Ethernet PHY chip. Passing between LAN8720A and STM32
The USART universal synchronous/asynchronous serial interface communicates data.
The gateway hardware structure mainly comprises a main control chip, a LoRa radio frequency chip, a communication module, a peripheral circuit and the like.
Fig. 4 is a gateway system hardware framework system. The system relies on the STM32F407 microprocessor to complete data processing and control functions. The LoRa module is used for the information interaction of gateway and terminal. The FLASH chip stores the information data transmitted by the terminal. The RTC clock chip DS1307 provides accurate timing signals for the processor. The 4G module EC20, the Ethernet module LAN8270A and the Wi Fi module EMW3060-P are used for data transmission between the gateway and the server. The power supply circuit converts an external power supply into a voltage source required by system work and supplies power to core devices such as an MCU control system, a LoRa communication module, an LTE communication module, an Ethernet communication module and a Wi-Fi wireless module.
Claims (6)
1. A GIS equipment partial discharge monitoring system based on wireless transmission comprises: the wireless monitoring and discharging system comprises wireless monitoring and discharging nodes (1), a wireless network (2), gateway nodes (3) and a monitoring computer (4), and is characterized in that the wireless monitoring and discharging nodes (1) are installed on GIS equipment, the wireless monitoring and discharging nodes (1) adopt a star network topological structure for networking, the gateway nodes (3) are used as central nodes and are connected with a plurality of wireless monitoring and discharging nodes (1), and the gateway nodes (3) receive and process data uploaded by the wireless monitoring and discharging nodes (1) and then transmit data information to the monitoring computer (4) in a centralized mode.
2. The GIS device partial discharge monitoring system based on wireless transmission according to claim 1, wherein the wireless monitoring discharge node (1) is formed by using a microprocessor as a control core to respectively control a discharge signal acquisition module and a wireless transceiver module.
3. The GIS device partial discharge monitoring system based on wireless transmission as claimed in claim 2 wherein the discharge signal collection module is configured to transmit the signals collected by the ultrasonic sensor to the microprocessor after a/D conversion by the signal conditioning circuit.
4. The GIS device partial discharge monitoring system based on wireless transmission as claimed in claim 1, wherein the hardware structure of the gateway node (3) comprises: the device comprises a main control chip, a LoRa radio frequency chip, a communication module and a peripheral circuit.
5. The GIS equipment partial discharge monitoring system based on wireless transmission of claim 3, wherein the microprocessor is an STM32L series single chip microcomputer.
6. The GIS device partial discharge monitoring system based on wireless transmission according to claim 4, wherein the LoRa radio frequency chip adopts SX12XX series chips.
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| CN202221890969.7U CN218412775U (en) | 2022-07-21 | 2022-07-21 | GIS equipment partial discharge monitoring system based on wireless transmission |
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| CN202221890969.7U CN218412775U (en) | 2022-07-21 | 2022-07-21 | GIS equipment partial discharge monitoring system based on wireless transmission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517878A (en) * | 2023-08-18 | 2024-02-06 | 国网上海市电力公司 | Partial discharge sensor device and control method for power distribution equipment |
| CN118865649A (en) * | 2024-07-01 | 2024-10-29 | 深圳大学 | A long-range, low-power LoRa-controlled intelligent metasurface system |
-
2022
- 2022-07-21 CN CN202221890969.7U patent/CN218412775U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517878A (en) * | 2023-08-18 | 2024-02-06 | 国网上海市电力公司 | Partial discharge sensor device and control method for power distribution equipment |
| CN118865649A (en) * | 2024-07-01 | 2024-10-29 | 深圳大学 | A long-range, low-power LoRa-controlled intelligent metasurface system |
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