CN213093939U - Underground cable wireless real-time monitoring system - Google Patents

Underground cable wireless real-time monitoring system Download PDF

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Publication number
CN213093939U
CN213093939U CN202022255787.XU CN202022255787U CN213093939U CN 213093939 U CN213093939 U CN 213093939U CN 202022255787 U CN202022255787 U CN 202022255787U CN 213093939 U CN213093939 U CN 213093939U
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China
Prior art keywords
cable
underground
energy
module
monitoring device
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Expired - Fee Related
Application number
CN202022255787.XU
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Chinese (zh)
Inventor
马浩
陈永龑
施宇冬
马琦骏
肖玲玲
赵璇
朱佳颖
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Shanghai Shidongkou First Power Plant of Huaneng Power International Inc
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Shanghai Shidongkou First Power Plant of Huaneng Power International Inc
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Priority to CN202022255787.XU priority Critical patent/CN213093939U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/40—Display of information, e.g. of data or controls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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Abstract

The utility model discloses a wireless real-time monitoring system for underground cables, which consists of a cable parameter detection device arranged underground and a monitoring device on the ground, wherein the cable parameter detection device comprises an energy acquisition module, a cable parameter acquisition module and a second microcontroller; the monitoring device comprises a first microcontroller and a display screen; the energy-taking module is used for taking energy from an underground cable and converting the energy into a working power supply of the cable parameter detection device. The utility model discloses a wireless real-time monitoring system of underground cable, its cable parameter detection device can regard as working power supply through getting to get on the module direct monitoring cable, has solved the difficulty that the underground environment can't provide monitoring devices's working power supply. The utility model discloses wireless real-time monitoring system of underground cable need not the scene and provides working power supply and electrical wiring, and transmission distance is far away, is applicable to the parameter control of burying the cable deeply underground on a large scale, and the practicality is strong.

Description

Underground cable wireless real-time monitoring system
Technical Field
The utility model relates to a wireless real-time monitoring system of underground cable especially relates to the wireless real-time monitoring system of underground cable in the factory of thermal power factory.
Background
In the factory area of the thermal power plant, most of the power cables are laid underground. Because the cable runs at high voltage, high current and high temperature, faults such as overcurrent, insulation aging, breakdown and the like easily occur, and fire can be caused in severe cases, so that parameters such as temperature, current and the like need to be monitored in real time to ensure safe and reliable running of the cable.
The applicant finds that the underground laying environment of the cable is severe, the underground laying environment often does not have a working power supply of the detection device, and the problem that the rewiring access of the wired monitoring device is difficult to install and the like is faced. Therefore, the wireless monitoring device for the underground cable is designed, and has important significance for guaranteeing safe and reliable operation of the cable and a power plant.
Secondly, the applicant also finds that the existing wireless monitoring system, which adopts wireless communication technologies such as ZIGBEE and bluetooth, generally has the problems of large power consumption, short transmission distance, poor penetration capability, and the like, and cannot adapt to the characteristics of deep burying of underground cables and wide range in the factory area of the thermal power plant, and the requirement of centralized monitoring on the ground.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies of the prior art, the utility model provides a wireless real-time monitoring system of underground cable is particularly useful for the underground cable monitoring in the thermal power factory.
The utility model discloses the technical problem that will solve realizes through following technical scheme:
the system comprises a cable parameter detection device and a ground monitoring device, wherein the cable parameter detection device comprises an energy acquisition module, a cable parameter acquisition module and a second microcontroller; the monitoring device comprises a first microcontroller and an LCD display screen; the energy-taking module is used for taking energy from an underground cable and converting the energy into a working power supply of the cable parameter detection device.
The energy taking module comprises an energy taking coil and a voltage conversion module; the energy-taking coil is arranged on the cable and used for obtaining induced voltage.
The voltage conversion module comprises a rectifying and filtering module, an overvoltage protection module, a voltage reduction module and an AC-DC conversion circuit.
The cable parameter detection device comprises a second wireless communication chip, the monitoring device comprises a first wireless communication chip, and wireless communication is carried out between the monitoring device and the cable parameter detection device through the first wireless communication chip and the second wireless communication chip.
The cable parameter acquisition module comprises a temperature acquisition circuit and a current acquisition circuit; the temperature acquisition circuit and the current acquisition circuit are respectively used for acquiring the temperature and the load current parameters of the cable and sending the parameters to the second microcontroller, and the parameters are transmitted to the monitoring device through the second wireless communication chip after being processed by the second microcontroller.
The temperature acquisition circuit comprises a digital temperature sensor, and the digital temperature sensor is connected with a pin of the second microcontroller in a single-wire communication mode; and a pull-up resistor is connected in parallel between a power supply and a signal wire of the digital temperature sensor.
The current acquisition circuit comprises a current transformer, a sampling resistor, a differential amplification circuit and a reverse amplification circuit which are connected in sequence.
The first wireless communication chip of the monitoring device is used for receiving signals sent by the cable parameter detection device, and the first microcontroller of the monitoring device is used for processing the signals and then displaying the signals on the LCD display screen.
The wireless communication chips of the cable parameter detection device and the monitoring device are SX1278 in model. The chip uses an LORA wireless communication protocol and has the advantages of long transmission distance, low power consumption, multiple nodes and the like.
One monitoring device corresponds to a plurality of cable parameter detection devices and distributes different communication addresses for the plurality of cable parameter detection devices, and the monitoring device sequentially inquires the addresses of the underground cable parameter detection devices and sends inquiry signals to the parameter detection devices of the addresses. The underground cable parameter detection device and the above-ground monitoring device adopt an inquiry-response communication mode to realize that one monitoring device simultaneously monitors a plurality of underground cable parameter detection devices.
The utility model discloses following beneficial effect has:
(1) the utility model discloses a wireless real-time monitoring system of underground cable, its cable parameter detection device can regard as working power supply through getting to get on the module direct monitoring cable, has solved the difficulty that the underground environment can't provide monitoring devices's working power supply.
(2) The utility model discloses a wireless real-time monitoring system of underground cable, the wireless communication chip of adoption have transmission distance far away, low-power consumption, multinode, low-cost advantage based on LORA wireless transmission technique, can realize the parameter of burying the cable deeply in the underground on a large scale in the factory of thermal power factory to and subaerial parameter processing, demonstration.
(3) The utility model discloses a wireless real-time monitoring system of underground cable adopts inquiry-response communication mode, inquires each underground cable parameter detection device in proper order by monitoring device, can realize that a monitoring device is simultaneously to the centralized monitoring and the demonstration of a plurality of position underground cable parameters.
(4) The utility model discloses can extensively be applicable to the electric power trade.
Drawings
FIG. 1 is a block diagram of the wireless real-time monitoring system for underground cables of the present invention;
FIG. 2 is a structural diagram of the cable parameter detecting device of the present invention;
fig. 3 is a schematic diagram of the energy-taking module of the present invention;
fig. 4 is a schematic diagram of the temperature acquisition circuit of the present invention;
fig. 5 is a schematic diagram of the current collecting circuit of the present invention;
fig. 6 is a structural diagram of the monitoring device of the present invention;
fig. 7 is a flowchart of the procedure of the first microcontroller STM32 in the monitoring device of the present invention;
fig. 8 is a flowchart of a second program of the micro-control STM32 in the cable parameter detection apparatus of the present invention.
The attached drawings are marked as follows:
the device comprises a monitoring device 1, a cable parameter detection device 2, a first microcontroller 11, an LCD display screen 12, a first wireless communication chip 13, an energy taking module 21, a second microcontroller 22, a second wireless communication chip 23, a temperature acquisition module 24, a current acquisition module 25, an energy taking coil 201, a rectifying and filtering module 202, an overvoltage protection module 203, a voltage reduction module 204, an AC-DC conversion circuit 205 and a cable 3.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
A wireless real-time monitoring system for underground cables, comprising: the system structure is shown in fig. 1, wherein the cable parameter detection device 2 arranged underground and the monitoring device 1 arranged on the ground communicate with each other based on wireless transmission.
The underground cable parameter detection device 2 comprises an energy obtaining module 21, a cable parameter acquisition module and a second microcontroller 22, and the structure of the cable parameter detection device 2 is shown in fig. 2.
The monitoring device 1 on the ground is shown in fig. 6 and comprises a first microcontroller 11 and an LCD display screen 12.
The second microcontroller 22 of the cable parameter detection device 2 and the first microcontroller 11 of the monitoring device 1 are each of the model STM 32.
The underground cable wireless real-time monitoring system further comprises a wireless communication module. Specifically, the cable parameter detection device 2 includes a second wireless communication chip 23, the monitoring device 1 includes a first wireless communication chip 13, and wireless communication is performed between the monitoring device 1 and the cable parameter detection device 2 through the first wireless communication chip 13 and the second wireless communication chip 23.
The second wireless communication chip 23 of the cable parameter detection device 2 and the first wireless communication chip 13 of the monitoring device 1 are both SX1278 in model.
For overcoming the underground environment at cable laying not have the difficulty that supplies the required power of cable parameter detection device 2 operation, the utility model discloses have directly to get the ability and convert the getting of 2 working power supplies of cable parameter detection device 21 of energy of getting from the cable.
The energy-harvesting module 21 of the present application is shown in fig. 3. The energy extracting module 21 includes an energy extracting coil 201 and a voltage converting module. Wherein, the energy extracting coil 201 is installed on the cable 3, and the energy extracting module 21 can obtain induced voltage when current passes through the cable 3 by installing the energy extracting coil 201 on the cable 3. The voltage conversion module is used for converting the induced voltage obtained by the energy-obtaining coil 201 so as to provide a proper working power supply for the cable parameter detection device 2.
The voltage conversion module comprises a rectification filter module 202, an overvoltage protection module 203, a voltage reduction module 204 and an AC-DC conversion circuit 205 which are connected in sequence. The waveform of the induced voltage obtained by the energy-taking coil 201 is similar to a sine waveform, and then the induced voltage is rectified and filtered by the rectifying and filtering module 202 to obtain an alternating voltage. Because the underground cable 3 probably appears thunder and lightning overcurrent or short circuit trouble in the operation process, the instantaneous current is too big can produce huge induced voltage in getting can coil 201 and damage coil and back-end circuit, and this application carries out overvoltage protection through increasing overvoltage protection module 203. And finally, the induced voltage is reduced through a voltage reduction module 204, and the obtained alternating current voltage is converted into the required direct current voltage through an AC-DC conversion circuit 205, so that the cable parameter detection device 2 works and uses. The AC-DC conversion circuit 205 of the present application can output a plurality of different DC voltage values to meet the voltage requirements of different devices, such as 5V and 12V that can output DC.
The first wireless communication chip 13 and the second wireless communication chip 23 both comprise LORA communication technology protocol modules, the two wireless communication chips SX1278 carry out wireless communication based on the LORA communication technology protocol, the transmitting frequency is 410-441 MHz, the communication distance is up to 3000m, the wireless communication chips can work at the temperature of minus 40 ℃ to plus 85 ℃, the data transmission rate reaches 20Kbp/s, and multi-node communication is supported.
In one particular embodiment, the cable parameter acquisition module preferably includes a temperature acquisition module 24 and a current acquisition module 25. It is understood that the cable parameter collection module may further include other cable information collection modules, such as a humidity collection module, and is not limited thereto.
The monitoring device 1 performs wireless communication with the second wireless communication chip 23 of the cable parameter detection device 2 through the first wireless communication chip 13.
The monitoring device 1 receives the detection values such as the cable current value and the temperature value sent by the cable parameter detection device 2. The first microcontroller 11 of the monitoring device 1 is used for processing the signal, and then displaying the detected value on the LCD 12, so as to monitor the cable parameter.
The temperature acquisition circuit and the current acquisition circuit are respectively used for acquiring the temperature and the load current parameters of the cable and sending the parameters into the second microcontroller 22, and the second microcontroller 22 transmits the parameters to the monitoring device 1 through the second wireless communication chip 23 after processing.
Wherein, the temperature acquisition circuit is shown in fig. 4. The circuit is based on a DS18B20 digital temperature sensor, converts an analog signal of temperature into a digital signal to be directly output, and is connected with a pin of a second microcontroller 22 (model STM 32) in a single-wire communication mode. Considering that the microcontroller singlechip cannot normally acquire temperature data due to the fact that the pulse high level value of the signal output is possibly too small, a pull-up resistor with the resistance value of 1K ohm is connected between the power supply and the signal line in parallel to improve the high level value of the signal output.
Wherein the current collection circuit is shown in fig. 5. The current acquisition circuit comprises a current transformer L1, a sampling resistor R1 and a two-stage amplifying circuit which are connected in sequence. ZMPT101B Current Transformer L1 for obtaining Induction Current I from Cable1The sampling resistor R1 is connected in parallel with the current transformer L1,induced current I1The voltage value is converted into a voltage value through a sampling resistor R1, and then the voltage value passes through a two-stage amplifying circuit constructed by an operational amplifier.
The first-stage amplifying circuit is a differential amplifying circuit, and the second-stage amplifying circuit is a reverse amplifying circuit. The first-stage amplifying circuit comprises a first amplifier U1, a third resistor R3 is connected between the positive input end of the first amplifier U1 and the first end of a sampling resistor R1, and a second resistor R2 is connected between the negative input end of the first amplifier U1 and the second end of the sampling resistor R1.
The second stage of amplification circuitry includes a second amplifier U2. A sixth resistor R6 is connected between the output terminal of the first amplifier U1 and the negative input terminal of the second amplifier U2, and a fifth resistor R5 is connected between the negative input terminal of the first amplifier U1 and the sixth resistor R6.
The negative input end and the output end of the second amplifier U2 are connected in parallel with a seventh resistor R7, the positive input end of the second amplifier U2 is grounded through an eighth resistor R8, the output end of the second amplifier U2 is used for directly sending the amplified voltage signal to the microcontroller STM32, the amplified voltage signal is read by an internal AD converter of the microcontroller, and the current value of the cable is obtained after processing.
The first stage amplifying circuit further comprises a second resistor R2 and a fifth resistor R5, and the amplification factor of the first stage amplifying circuit = R5/R2.
The first stage amplifying circuit further comprises a seventh resistor R7 and a fifth resistor R5, and the amplification factor of the second stage amplifying circuit = R7/R6.
A monitoring devices 1 of this application corresponds a plurality of cable parameter detection device 2, can realize that a monitoring devices 1 monitors a plurality of underground cable parameter detection device 2 simultaneously. The monitoring device 1 distributes different communication addresses to the underground cable parameter detection devices 2, the overground monitoring device 1 and the underground cable parameter detection devices 2 adopt an inquiry-response communication mode, and the monitoring device 1 inquires the addresses of the underground cable parameter detection devices 2 in sequence and sends inquiry signals to the underground cable parameter detection devices 2 with different communication addresses; the underground cable parameter detection device 2 responds the detection value to the monitoring device 1 after inquiring.
The working process of the underground cable wireless real-time monitoring system is as follows:
firstly, the monitoring device 1 acquires a communication address of a first cable parameter detection device 2 through a first microcontroller 11, and sends an inquiry signal to the parameter detection device 2 of the address through a first wireless communication chip 13;
after receiving the inquiry signal, the corresponding underground cable parameter detection device 2 starts temperature and current acquisition, responds to the monitoring device 1, and sends a detection value to the monitoring device 1; the monitoring device 1 receives and obtains the current and temperature parameter detection values sent by the parameter detection device, and then displays the current and temperature parameter detection values on the LCD display screen 12;
the process is then repeated and the monitoring device 1 acquires the communication address of the next cable parameter sensing device 2 and interrogates the underground cable parameter sensing device 2 at that address.
Program flow charts of the first microcontroller and the second microcontroller STM32 in the monitoring device 1 and the underground cable parameter detection device 2 are respectively shown in FIG. 7 and FIG. 8.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is specific and detailed, but the invention can not be understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by adopting the equivalent substitution or equivalent transformation should fall within the protection scope of the present invention.

Claims (10)

1. The system is characterized in that the cable parameter detection device comprises an energy acquisition module, a cable parameter acquisition module and a second microcontroller; the monitoring device comprises a first microcontroller and a display screen; the energy-taking module is used for taking energy from an underground cable and converting the energy into a working power supply of the cable parameter detection device.
2. The underground cable wireless real-time monitoring system of claim 1, wherein the energy-harvesting module comprises an energy-harvesting coil and a voltage conversion module; the energy-taking coil is arranged on the cable and used for obtaining induced voltage.
3. The underground cable wireless real-time monitoring system of claim 2, wherein the voltage conversion module comprises a rectifier filter module, an overvoltage protection module, a voltage reduction module, and an AC-DC conversion circuit.
4. The system according to claim 1, wherein the cable parameter detecting device comprises a second wireless communication chip, the monitoring device comprises a first wireless communication chip, and the monitoring device and the cable parameter detecting device are in wireless communication via the first wireless communication chip and the second wireless communication chip.
5. The underground cable wireless real-time monitoring system of claim 4, wherein the cable parameter acquisition module comprises a temperature acquisition circuit and a current acquisition circuit; the temperature acquisition circuit and the current acquisition circuit are respectively used for acquiring the temperature and the load current parameters of the cable and sending the parameters to the second microcontroller, and the parameters are transmitted to the monitoring device through the second wireless communication chip after being processed by the second microcontroller.
6. The underground cable wireless real-time monitoring system as claimed in claim 5, wherein the temperature acquisition circuit comprises a digital temperature sensor, and the digital temperature sensor is connected with a pin of the second microcontroller in a single-wire communication manner; and a pull-up resistor is connected in parallel between a power supply and a signal wire of the digital temperature sensor.
7. The underground cable wireless real-time monitoring system as claimed in claim 5, wherein the current collecting circuit comprises a current transformer, a sampling resistor, a differential amplifying circuit and a reverse amplifying circuit which are connected in sequence.
8. The system according to claim 1, wherein the first wireless communication chip of the monitoring device is configured to receive a signal from the cable parameter detection device, and the first microcontroller of the monitoring device is configured to process the signal and display the processed signal on the LCD screen.
9. The system for wireless real-time monitoring of underground cables according to claim 4, wherein the wireless communication chips of the cable parameter detection device and the monitoring device are SX 1278.
10. The wireless real-time underground cable monitoring system according to claim 1, wherein one monitoring device corresponds to a plurality of cable parameter detecting devices and assigns different communication addresses to the plurality of cable parameter detecting devices, and the monitoring device sequentially inquires the addresses of the underground cable parameter detecting devices and sends inquiry signals to the parameter detecting devices at the addresses.
CN202022255787.XU 2020-10-12 2020-10-12 Underground cable wireless real-time monitoring system Expired - Fee Related CN213093939U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022255787.XU CN213093939U (en) 2020-10-12 2020-10-12 Underground cable wireless real-time monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022255787.XU CN213093939U (en) 2020-10-12 2020-10-12 Underground cable wireless real-time monitoring system

Publications (1)

Publication Number Publication Date
CN213093939U true CN213093939U (en) 2021-04-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022255787.XU Expired - Fee Related CN213093939U (en) 2020-10-12 2020-10-12 Underground cable wireless real-time monitoring system

Country Status (1)

Country Link
CN (1) CN213093939U (en)

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