CN112671833B - Anti-excavation monitoring system and method for underground pipeline - Google Patents
Anti-excavation monitoring system and method for underground pipeline Download PDFInfo
- Publication number
- CN112671833B CN112671833B CN202011406166.5A CN202011406166A CN112671833B CN 112671833 B CN112671833 B CN 112671833B CN 202011406166 A CN202011406166 A CN 202011406166A CN 112671833 B CN112671833 B CN 112671833B
- Authority
- CN
- China
- Prior art keywords
- main controller
- excavation
- vibration
- module
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses an underground pipeline anti-excavation monitoring system and method, wherein the system comprises a vibration sensor buried in soil above the underground pipeline, a main controller for controlling the vibration sensor in real time and a server provided with an anti-excavation monitoring platform, the main controller is in wireless connection with the server, and is connected with a GPS module, an ADC module and an alarm circuit module, and the vibration sensor is respectively connected with the ADC module and the alarm circuit module through a signal conditioning module. The underground pipeline anti-excavation monitoring system provided by the invention is used for monitoring the underground pipeline in a certain range in real time, and the alarm information can be immediately transmitted to the background once the excavation action is monitored, so that a management department can timely go to the site for treatment, the damage of third party construction to the gas pipeline is prevented, and the system has important significance for ensuring the safe, stable and efficient operation of the natural gas pipeline.
Description
Technical Field
The present disclosure relates to monitoring systems and methods, and particularly to an underground pipeline excavation prevention monitoring system and method.
Background
Natural gas is a clean excellent energy, improves the specific gravity of natural gas in primary energy, and has important significance for optimizing the energy structure of China and relieving the energy demand tension and environmental protection pressure of China. However, with the development of urban road construction and greening construction, third party construction gradually becomes a main factor of damage to the gas pipeline. Gas enterprises invest huge manpower and financial resources for maintaining the integrity of natural gas pipelines and preventing third parties from damaging, but pipeline protection is increasingly urgent. The third party of natural gas pipeline destroys cause complicacy, and the randomness is strong, is difficult for predicting and controlling, consequently if can carry out effective monitoring to third party's construction excavation, will be favorable to preventing the pipeline inefficacy that third party's construction caused and destroy the accident, has important meaning to guaranteeing natural gas pipeline safety, steady, high-efficient operation.
Disclosure of Invention
The invention aims to provide an anti-excavation monitoring system for an underground pipeline, which can monitor whether excavation is performed within a certain range in real time, and can immediately transmit alarm information to a background once the excavation is monitored, so that a management department can timely go to the site to perform treatment, and damage to a gas pipeline caused by third party construction is prevented.
Another object of the present invention is to provide a monitoring method using the above anti-excavation monitoring system.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to an anti-excavation monitoring system of an underground pipeline, which is characterized by comprising a vibration sensor buried in soil above the underground pipeline, a main controller for controlling the vibration sensor in real time and a server provided with an anti-excavation monitoring platform, wherein the main controller is in wireless connection with the server, and is connected with a GPS module, an ADC module and an alarm circuit module;
the vibration sensor is used for sensing environmental vibration and converting a vibration signal into a voltage signal to be output;
the signal conditioning module amplifies the voltage signal output by the vibration sensor and improves the signal amplitude;
the ADC module converts the analog signals into digital signals and transmits the digital signals to the main controller;
the alarm circuit module is used for judging the amplitude of the vibration signal, and when the amplitude exceeds a set threshold value, the main controller sends an alarm signal to the server, and the server sends an acquisition command to the alarm equipment after receiving the signal;
the GPS module is responsible for providing time information for the main controller and sending a second pulse signal, and is used for synchronously starting data acquisition at a set time point by the main controller.
Preferably, the main controller is also connected with a storage module, a power management module and a wireless communication module;
the power management module is responsible for providing multi-channel voltage-stabilizing direct current power supply output, meeting the normal working requirements of each functional module, realizing high-efficiency management of the power supply, reducing the system power consumption as much as possible and prolonging the battery endurance time;
the storage module is used for storing the sensor data information, the electric quantity information and the configuration information;
and the wireless communication module is responsible for communicating with the server and completing heartbeat data transmission, alarm information transmission, vibration data transmission and parameter configuration.
Preferably, the vibration sensors are grouped into 5 groups, and 5 vibration sensors of each group are arranged in a cross shape above the underground pipeline.
Preferably, the distance between adjacent vibration sensors is 5-8m.
Preferably, the synchronization accuracy of the GPS module is 100us.
Preferably, the model number of the main controller is STM32F103RC.
The invention relates to an anti-excavation monitoring method of an underground pipeline, which is characterized by comprising the following steps of,
(1) The vibration sensor monitors vibration signals in the working area and transmits the vibration signals to the signal conditioning module;
(2) The vibration signal is transmitted to the alarm circuit module after passing through the signal conditioning module;
(3) When the alarm circuit module judges that the monitored vibration signal exceeds a set threshold value, alarm information is sent to the main controller, and the main controller forwards the alarm information to the anti-excavation monitoring platform;
(4) When the anti-excavation monitoring platform receives alarm information sent by 3 or more alarm circuit modules in the same group of sensors, the anti-excavation monitoring platform sends the numbers of all the devices in the group to the main controller, and the main controller sends an instruction for starting acquisition at a certain moment to the group of sensors;
(5) When the moment is reached, the group of sensors start to collect vibration signals in a time period t1 at the same time, after the collection is completed, collected signal data are packaged into one data packet per second and sent to the main controller one by one, after the main controller receives the data, whether the data are complete is judged first, and then after the data in a continuous time period t1 from a certain moment of the same group of 5 equipment are received, an algorithm is called for calculation and analysis, and the main controller comprehensively judges the excavation type and the positioning result according to the result returned by the algorithm.
Preferably, in step (5), during calculation and analysis, the final result is calculated to perform algorithm call for at least 5 times, if less than 5 sets of results, a wake-up instruction is issued again to the same set of sensors to perform new data acquisition and uploading, and then the algorithm is called to obtain the results until 5 sets of result data are obtained.
Preferably, in the step (4), the time interval of receiving the vibration signal by the anti-excavation monitoring platform is within 20S; the time period t1 in step (5) is 10s, and the sampling rate of the 10s vibration signal is 3750.
Preferably, the division standard of the excavation type is that 0 represents trenchless, 1 represents artificial excavation, and 2 represents mechanical excavation.
Compared with the prior art, the underground pipeline anti-excavation monitoring system provided by the invention is used for monitoring the underground pipeline in a certain range in real time, and the alarm information can be immediately transmitted to the background once the excavation action is monitored, so that a management department can timely go to the site for treatment, the damage of third party construction to the gas pipeline is prevented, and the system has important significance for ensuring the safe, stable and efficient operation of the natural gas pipeline.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a system block diagram of an anti-excavation system of the present invention;
FIG. 2 is a layout of the same set of vibration sensors;
FIG. 3 is a schematic diagram of the anti-excavation monitoring method of the present invention;
FIG. 4 is a layout of the same set of vibration sensors in embodiment 1;
fig. 5 is a diagram of the excavation site collected in example 1.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1-3, an anti-excavation monitoring system for an underground pipeline comprises a vibration sensor buried in soil above the underground pipeline, a main controller for controlling the vibration sensor in real time and a server provided with an anti-excavation monitoring platform, wherein the main controller is in wireless connection with the server, and is connected with a GPS module, an ADC module and an alarm circuit module;
the vibration sensor is used for sensing environmental vibration and converting a vibration signal into a voltage signal to be output;
the signal conditioning module amplifies the voltage signal output by the vibration sensor and improves the signal amplitude;
the ADC module converts the analog signals into digital signals and transmits the digital signals to the main controller;
the alarm circuit module is used for judging the amplitude of the vibration signal, and when the amplitude exceeds a set threshold value, the main controller sends an alarm signal to the server, and the server sends an acquisition command to the alarm equipment after receiving the signal;
the GPS module is responsible for providing time information for the main controller and sending a second pulse signal, and is used for synchronously starting data acquisition at a set time point by the main controller.
The main controller is also connected with a storage module, a power management module and a wireless communication module;
the power management module is responsible for providing multi-channel voltage-stabilizing direct current power supply output, meeting the normal working requirements of each functional module, realizing high-efficiency management of the power supply, reducing the system power consumption as much as possible and prolonging the battery endurance time;
the storage module is used for storing the sensor data information, the electric quantity information and the configuration information;
and the wireless communication module is responsible for communicating with the server and completing heartbeat data transmission, alarm information transmission, vibration data transmission and parameter configuration.
In order to realize accurate positioning of the excavation signals, the vibration sensors adopt a five-membered cross positioning method, namely 5 vibration sensors are used as a group, and 5 vibration sensors in each group are arranged in a cross shape above an underground pipeline.
The distance between adjacent vibration sensors is 5-8m.
The synchronization precision of the GPS module is 100us.
The model of the main controller is STM32F103RC.
An anti-excavation monitoring method for underground pipelines, which comprises the following steps,
(1) The vibration sensor monitors vibration signals in the working area and transmits the vibration signals to the signal conditioning module;
(2) The vibration signal is transmitted to the alarm circuit module after passing through the signal conditioning module;
(3) When the alarm circuit module judges that the monitored vibration signal exceeds a set threshold value, alarm information is sent to the main controller, and the main controller forwards the alarm information to the anti-excavation monitoring platform;
(4) When the anti-excavation monitoring platform receives alarm information sent by 3 or more alarm circuit modules in the same group of sensors (within 20S), the anti-excavation monitoring platform sends the numbers of all the devices in the group to the main controller, and the main controller sends an instruction for starting acquisition at a certain moment to the group of sensors;
(5) When the moment is reached, the group of sensors start to collect 10s vibration signals at the same time, the sampling rate of the 10s vibration signals is 3750, after the collection is completed, collected signal data are packaged into one data packet per second and sent to the main controller one by one, after the main controller receives the data, whether the data are complete is judged first, then after the same group of 5 pieces of equipment receive all the continuous 10s data from a certain moment, an algorithm is called for calculation and analysis, and the main controller comprehensively judges the excavation type (0 non-excavation 1 manual excavation 2 mechanical excavation) and the positioning result (distance and angle relative to a central point) according to the returned result of the algorithm.
In order to reduce the occurrence of misjudgment, the final result is calculated to require algorithm calling for at least 5 times, so that the main controller can judge the result of the calling algorithm, if the result is less than 5 groups of results, a wake-up instruction is issued again to the same group of sensors to perform new round data acquisition and uploading, then the algorithm is called to obtain the result until 5 groups of result data are obtained, then the main controller comprehensively judges according to the result returned by the algorithm (firstly 1 2 is taken as a major class, if the sum of times of 1 and 2 is greater than the number of times of 0, the main controller judges that excavation is not performed, otherwise, in the case that the excavation is performed, the main controller judges whether the excavation is performed manually or mechanically according to the number of times of 1 and 2, if the two times are equal, the main controller judges that the excavation is performed mechanically, and the final result is transmitted to an excavation prevention monitoring platform (the excavation type and the position information are transmitted when the excavation is performed, and the excavation type is only transmitted when the excavation is not performed).
Example 1, referring to fig. 4 and 5, five vibration sensors of the same group are arranged with a spacing d, and the system positioning process: and after the excavation signal is detected, positioning the excavation target signal by utilizing a five-membered cross method.
(1) Performing cross-correlation operation on signals of the sensors 1 and 4 and the sensors 3 and 4 respectively, and predicting which right angle area is up, down, left and right by the targets through two time delays;
(2) If the target is prejudged in the upper/lower right angle area, the sensor 1, 2 and 3 are used for positioning in a three-point straight line combination; if the prejudging target is in the left/right angle area, positioning by using three-point straight line combinations of the sensors 4, 2 and 5;
(3) When the positioning result exceeds the right angle area to be judged, switching to a sensor corresponding to the right angle area where the positioning result is positioned for repositioning.
The system processes the acquired signals:
signal denoising algorithm: sdn=signalDenoise (sn, vis_sw)
The input is a noise-containing signal, and the output is a denoising signal, so that contrast display is supported. The denoising algorithm adopts db10 wavelet base to carry out 5-layer wavelet decomposition, and adopts a Birge-Massart strategy to carry out soft threshold quantization of layered high-frequency wavelet coefficients, and finally, the denoising signal is reconstructed.
And (3) excavating a target signal detection and positioning algorithm:
[excaType,excaLocD,excaLocA]＝excavationMonitor(sig1,sig2,sig3,sig4,sig5,fs)
inputting signals collected by the five-element cross array and signal sampling rates, and outputting the types of the signals uploaded by excavation monitoring: non-excavation (extatipe=0), manual excavation (extatipe=1), mechanical excavation (extatipe=2), if an excavation signal is detected, excavation target signal source positioning information is output: excaLocD (polar radius), excaLocA (polar angle).
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An underground pipeline prevents excavation monitoring system, its characterized in that: the system comprises a vibration sensor buried in soil above an underground pipeline, a main controller for controlling the vibration sensor in real time and a server provided with an anti-excavation monitoring platform, wherein the main controller is in wireless connection with the server, and is connected with a GPS module, an ADC module and an alarm circuit module;
the vibration sensor is used for sensing environmental vibration and converting a vibration signal into a voltage signal to be output;
the signal conditioning module amplifies the voltage signal output by the vibration sensor and improves the signal amplitude;
the ADC module converts the analog signals into digital signals and transmits the digital signals to the main controller;
the alarm circuit module is used for judging the amplitude of the vibration signal, and when the amplitude exceeds a set threshold value, the main controller sends an alarm signal to the server, and the server sends an acquisition command to the alarm equipment after receiving the signal;
the GPS module is responsible for providing time information for the main controller and sending a second pulse signal, and is used for synchronously starting data acquisition at a set time point by the main controller;
the vibration sensors are in a group of 5, and 5 vibration sensors in each group are arranged in a cross shape above the underground pipeline;
when the anti-excavation monitoring platform receives alarm information sent by 3 or more alarm circuit modules in the same group of sensors, the anti-excavation monitoring platform sends the numbers of all the devices in the group to the main controller, and the main controller sends an instruction for starting acquisition at a certain moment to the group of sensors;
when the moment is reached, the group of sensors start to collect vibration signals in a time period t1 at the same time, after the collection is completed, collected signal data are packaged into a data packet which is sent to the main controller one by one every second, after the main controller receives the data, whether the data are complete is judged firstly, and then after the data in a continuous time period t1 of a plurality of devices in the same group are received from a certain moment, an algorithm is called for calculation and analysis, and the main controller comprehensively judges the excavation type and the positioning result according to the returned result of the algorithm;
and when the algorithm is called again to carry out calculation analysis, calculating a final result, carrying out algorithm calling at least 5 times, if the final result is less than 5 groups of results, sending a wake-up instruction again to the same group of sensors to carry out new-round data acquisition and uploading, and then calling the algorithm to obtain the result until 5 groups of result data are obtained.
2. The underground utility line trenchless monitoring system of claim 1, wherein: the main controller is also connected with a storage module, a power management module and a wireless communication module;
the power management module is responsible for providing multi-channel voltage-stabilizing direct current power supply output, meeting the normal working requirements of each functional module, realizing high-efficiency management of the power supply, reducing the system power consumption as much as possible and prolonging the battery endurance time;
the storage module is used for storing the sensor data information, the electric quantity information and the configuration information;
and the wireless communication module is responsible for communicating with the server and completing heartbeat data transmission, alarm information transmission, vibration data transmission and parameter configuration.
3. The underground utility line trenchless monitoring system of claim 1, wherein: the distance between adjacent vibration sensors is 5-8m.
4. The underground utility line trenchless monitoring system of claim 1, wherein: the synchronization precision of the GPS module is 100us.
5. The underground utility line trenchless monitoring system of claim 1, wherein: the model of the main controller is STM32F103RC.
6. An anti-excavation monitoring method for an underground pipeline is characterized by comprising the following steps of: the method comprises the steps of,
the vibration sensor monitors vibration signals in the working area and transmits the vibration signals to the signal conditioning module;
the vibration signal is transmitted to the alarm circuit module after passing through the signal conditioning module;
when the alarm circuit module judges that the monitored vibration signal exceeds a set threshold value, alarm information is sent to the main controller, and the main controller forwards the alarm information to the anti-excavation monitoring platform;
when the anti-excavation monitoring platform receives alarm information sent by 3 or more alarm circuit modules in the same group of sensors, the anti-excavation monitoring platform sends the numbers of all the devices in the group to the main controller, and the main controller sends an instruction for starting acquisition at a certain moment to the group of sensors;
when the moment is reached, the group of sensors start to collect vibration signals in a time period t1 at the same time, after the collection is completed, collected signal data are packaged into a data packet which is sent to the main controller one by one every second, after the main controller receives the data, whether the data are complete is judged first, then after the data in a continuous time period t1 starting from a certain moment are received by a plurality of devices in the same group, an algorithm is called again to perform calculation analysis, when the excavation type and the positioning result are comprehensively judged according to the returned result of the algorithm, the algorithm is called again to perform calculation analysis, the final result is calculated to perform algorithm calling for at least 5 times, if the result is less than 5 groups, a wake-up instruction is sent again to the sensors in the same group to perform new data collection and uploading, and then the algorithm is called to obtain the result until 5 groups of result data are obtained.
7. The anti-excavation monitoring system and method of an underground pipeline of claim 6, wherein: the time interval of the anti-excavation monitoring platform for receiving the vibration signal is within 20S;
the continuous period t1 is 10s and the sampling rate of the 10s vibration signal is 3750.
8. The anti-excavation monitoring system and method of an underground pipeline of claim 6, wherein: the division standard of the excavation type is that 0 represents no excavation, 1 represents artificial excavation and 2 represents mechanical excavation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406166.5A CN112671833B (en) | 2020-12-03 | 2020-12-03 | Anti-excavation monitoring system and method for underground pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406166.5A CN112671833B (en) | 2020-12-03 | 2020-12-03 | Anti-excavation monitoring system and method for underground pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112671833A CN112671833A (en) | 2021-04-16 |
| CN112671833B true CN112671833B (en) | 2023-05-26 |
Family
ID=75401044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011406166.5A Active CN112671833B (en) | 2020-12-03 | 2020-12-03 | Anti-excavation monitoring system and method for underground pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112671833B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804952B (en) * | 2021-08-30 | 2024-03-29 | 北京龙飞船科技有限公司 | Protection monitoring system and method |
| CN113984195B (en) * | 2021-11-05 | 2024-02-02 | 上海能源建设集团有限公司 | Municipal administration is pipeline perimeter third party activity sound and vibration monitoring and alarm system under way |
| CN115412438B (en) * | 2022-10-31 | 2022-12-27 | 中电工业互联网有限公司 | Low-power-consumption interconnected anti-dismantling system |
| CN116906837B (en) * | 2023-09-15 | 2023-11-28 | 上海同济工程咨询有限公司 | State monitoring system and monitoring method for underground pipeline |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129752A (en) * | 2010-01-12 | 2011-07-20 | 西安英诺视通信息技术有限公司 | System for online monitoring and alarming artificial destruction of outdoor facilities |
| CN205013046U (en) * | 2015-08-12 | 2016-02-03 | 中国矿业大学(北京) | Coal illegal mining monitoring system based on vibration monitor positioning |
| CN205038740U (en) * | 2015-10-28 | 2016-02-17 | 国网浙江杭州市萧山区供电公司 | Electric wire netting pipeline facility safety monitoring system |
| CN210006165U (en) * | 2019-07-08 | 2020-01-31 | 广州南沙发展燃气有限公司 | gas pipeline anti-damage early warning system |
| CN111179529A (en) * | 2020-02-26 | 2020-05-19 | 国网上海市电力公司 | Power cable prevents destroying early warning system |
-
2020
- 2020-12-03 CN CN202011406166.5A patent/CN112671833B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129752A (en) * | 2010-01-12 | 2011-07-20 | 西安英诺视通信息技术有限公司 | System for online monitoring and alarming artificial destruction of outdoor facilities |
| CN205013046U (en) * | 2015-08-12 | 2016-02-03 | 中国矿业大学(北京) | Coal illegal mining monitoring system based on vibration monitor positioning |
| CN205038740U (en) * | 2015-10-28 | 2016-02-17 | 国网浙江杭州市萧山区供电公司 | Electric wire netting pipeline facility safety monitoring system |
| CN210006165U (en) * | 2019-07-08 | 2020-01-31 | 广州南沙发展燃气有限公司 | gas pipeline anti-damage early warning system |
| CN111179529A (en) * | 2020-02-26 | 2020-05-19 | 国网上海市电力公司 | Power cable prevents destroying early warning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112671833A (en) | 2021-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112671833B (en) | Anti-excavation monitoring system and method for underground pipeline | |
| CN101349382B (en) | Anti-theft early warning method and system for pipeline transportation | |
| CN110230779A (en) | A kind of urban underground gas pepe monitoring system | |
| CN202836615U (en) | Intelligent electrical network comprehensive on-line monitoring system | |
| CN103531008A (en) | Micro inclination sensor for civil engineering and wireless monitoring system | |
| CN110942610A (en) | Intelligent rock microseismic acquisition and data wireless transmission system | |
| CN103344885A (en) | High-voltage single-core cable protective covering grounding online monitoring device and control method | |
| CN104805449A (en) | Device and system for intelligently detecting protection potential state of underground steel pipeline | |
| CN110690756A (en) | Intelligent management and control system for grounding wire of power transmission line | |
| CN207424136U (en) | A kind of arrester on-line monitoring system | |
| CN113206544B (en) | Power grid GIC monitoring device based on transformer high-voltage incoming and outgoing lines | |
| CN103698003A (en) | PSD (power spectral density) algorithm-based low-power-consumption real-time vibration monitoring system and method | |
| CN103986618A (en) | System and method for monitoring power transmission line through wireless communication | |
| CN113240240A (en) | Offshore oilfield group power system reliability assessment system and method thereof | |
| CN101871797A (en) | Portable wireless mobile geotechnical engineering parameter test platform based on Bluetooth | |
| CN107091961A (en) | Electric power monitoring method and system based on user side | |
| CN201576081U (en) | Remote wireless accumulator measuring system | |
| CN203503155U (en) | Mini-type inclination sensor for civil engineering and wireless monitoring system | |
| CN102175934A (en) | Data collection method of wave recording module | |
| CN110864738A (en) | Wide-area safety monitoring system and control method for power transmission tower | |
| CN203396822U (en) | On-line monitoring device for grounding currents flowing through sheaths of high-voltage single-core cables | |
| AU2022301223A9 (en) | Power transmission line fault positioning method, recording medium, and data processing apparatus | |
| CN205210233U (en) | Distribution network phase to earth fault detects and positioner | |
| CN203811313U (en) | Measurement sensing device and overhead contact system tension measuring system | |
| CN114530880A (en) | Power grid regional load prediction system and method based on big data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |