CN111781537A - Transformer substation grounding grid safety state on-line monitoring system - Google Patents
Transformer substation grounding grid safety state on-line monitoring system Download PDFInfo
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- CN111781537A CN111781537A CN202010776534.9A CN202010776534A CN111781537A CN 111781537 A CN111781537 A CN 111781537A CN 202010776534 A CN202010776534 A CN 202010776534A CN 111781537 A CN111781537 A CN 111781537A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/098—Magnetoresistive devices comprising tunnel junctions, e.g. tunnel magnetoresistance sensors
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Abstract
The invention discloses a transformer substation grounding grid safety state online monitoring system, which belongs to the technical field of transformer substations and comprises a background master station, a wireless convergence unit, a signal transmitting module, a magnetic field online monitoring module and a magnetic field movement detection module, wherein the output end of the background master station is connected with the input end of the wireless convergence unit through a network; according to the invention, the safety state of the transformer substation grounding grid is monitored on line, the system can realize one-key operation, the automatic electrification of field equipment, equipment awakening, automatic switching of access points, data acquisition, data transmission, data analysis and result output are completed by one-key operation, and the safety state monitoring of the transformer substation grounding grid can be completed in real time and conveniently by the on-line monitoring.
Description
Technical Field
The invention belongs to the technical field of transformer substations, and particularly relates to an online monitoring system for the safety state of a transformer substation grounding grid.
Background
The grounding grid is an important guarantee for the safe operation of the transformer substation, the grounding performance of the grounding grid is always emphasized by design and production operation departments, the grounding grid not only provides a common potential reference ground for various electrical equipment in the transformer substation during the safe operation of the transformer substation, but also can rapidly drain fault current and reduce the ground potential rise of the transformer substation when the grounding grid is struck by lightning or a power system has a short-circuit fault, the advantages and the disadvantages of the grounding performance of the grounding grid are directly related to the personal safety of workers in the transformer substation and the safe and normal operation of various electrical equipment, the conductor of the grounding grid is buried underground, and due to poor welding and the effects of welding leakage, soil corrosion, grounding short-circuit current and electric force during construction, the corrosion and even breakage of the conductor and the grounding lead can be caused, so that the electrical connection performance of the grounding grid is deteriorated, the grounding resistance is increased, and once the power system has the grounding short-, the phenomenon of local potential difference of the grounding grid or abnormal increase of the potential of the grounding grid can be caused, which not only brings danger to the safety of operation and maintenance personnel, but also can cause misoperation of equipment due to counterattack or damage to the insulating capability of secondary equipment by cable sheath circulating current, and causes huge economic loss and social influence.
The existing transformer substation judges the safety performance of the grounding grid, a common product is a grounding grid grounding impedance tester, the traditional grounding grid grounding impedance tester is adopted to detect the safety state of the grounding grid of the transformer substation, when the local part of the grounding grid has breakpoints and fracture defects, the resistance value between two accessible nodes of a grid conductor of the grounding grid is not obviously changed due to the mutual resistance between the two parts of grounding grids, moreover, the diagnosis method is limited by the specific position and the number of the accessible lower guide bodies, the measurement precision, the detection efficiency and the practicability are limited, and various existing grounding grid safety state detection products are used for off-line detection, namely, the transformer substation grounding grid safety state detection is carried out routinely in a fixed period or during the maintenance of the grounding grid, the detection period is long, the detection data accuracy is low, and the data accumulation period is long, the safety state of the grounding grid of the transformer substation cannot be detected in real time, and certain improvement is needed.
Disclosure of Invention
The invention aims to: in order to solve the problem that the safety performance of the grounding grid is judged by the existing transformer substation, a common product is a grounding grid grounding impedance tester, and the safety state of the grounding grid of the transformer substation is detected by adopting the traditional grounding grid grounding impedance tester. When the grounding grid has the defects of breakpoints and fractures locally, the resistance value between two accessible nodes of the grid conductor of the grounding grid is not changed obviously due to the mutual resistance between the two parts of grounding grids, and the transformer substation grounding grid safety state online monitoring system is provided.
In order to achieve the purpose, the invention adopts the following technical scheme: the transformer substation grounding grid safety state online monitoring system comprises a background main station, a wireless convergence unit, a signal transmitting module, a magnetic field online monitoring module and a magnetic field mobile detection module, wherein the output end of the background main station is connected with the input end of the wireless convergence unit through a network, the output end of the wireless convergence unit is electrically connected with the input end of the signal transmitting module, and the output end of the signal transmitting module is respectively connected with the input ends of the magnetic field online monitoring module and the magnetic field mobile detection module through a network.
As a further description of the above technical solution:
the magnetic field on-line monitoring module comprises a solar cell panel, a low-power-consumption CPU and a magnetic field intensity detection module, wherein the output end of the solar cell panel is electrically connected with the input end of a power management module, the output end of the power management module is electrically connected with the input end of a lithium battery, the power management module is electrically connected with the low-power-consumption CPU in a two-way mode, and the output end of the magnetic field intensity detection module is electrically connected with the input end of the low-power-consumption CPU.
As a further description of the above technical solution:
the magnetic field mobile detection module comprises a TF card, a low-power CPU, a magnetic field intensity detection module and a 9-axis sensor, the output ends of the magnetic field intensity detection module, the 9-axis sensor and a lithium battery are electrically connected with the input end of the low-power CPU, and the output end of the low-power CPU is electrically connected with the input end of the TF card.
As a further description of the above technical solution:
the wireless unit that assembles includes solar cell panel, magnetic field on-line monitoring device, battery, signal transmission device and low-power consumption CPU, solar cell panel's output and power management module's input electric connection, power management module's output and the input electric connection of battery, the two-way electric connection of power management module and low-power consumption CPU, low-power consumption CPU passes through 485 both way communication with signal transmission device and is connected, low-power consumption CPU passes through LORA both way communication with magnetic field on-line monitoring device and is connected.
As a further description of the above technical solution:
the magnetic field intensity detection module is composed of a tunnel sensor and a signal conditioning circuit, and the tunnel sensor is connected with the signal conditioning circuit through signals.
As a further description of the above technical solution:
the output end of the low-power-consumption CPU is connected with the input end of the background master station through a 4G private network.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the safety state of the transformer substation grounding grid is monitored on line, the system can realize one-key operation, the automatic electrification of field equipment, equipment awakening, automatic switching of access points, data acquisition, data transmission, data analysis and result output are completed by one-key operation, and the safety state monitoring of the transformer substation grounding grid can be completed in real time and conveniently by the on-line monitoring.
2. In the invention, the magnetic field detection part uses the magnetic tunnel sensor to realize the detection of weak magnetic field signals, and a signal conditioning circuit is designed at the rear end to filter and amplify the signals, thereby realizing the extraction of effective signals.
3. In the invention, the transformer substation grounding grid safety state is detected movably, the detection of the transformer substation grounding grid topological structure can be completed by the movement detection, the detection is carried out on the area where the transformer substation grounding grid drawing is lost or the grounding grid topological structure is unknown, and the drawing of the transformer substation grounding grid topological structure is completed; the mobile detection can be used for carrying out key monitoring on key, special or abnormal areas of the grounding grid of the transformer substation, and can complete all-around and accurate detection of the grounding grid system.
4. According to the transformer substation grounding grid safety state online monitoring system, the safety state of the grounding grid can be monitored online in real time, data acquisition is convenient, real-time performance is high, statistics and trend analysis can be carried out on the data, the service life can be estimated, a danger pre-alarm can be given, and safe and stable operation of the transformer substation grounding grid can be guaranteed in real time.
Drawings
Fig. 1 is a schematic diagram of a module structure of a transformer substation grounding grid safety state online monitoring system.
Fig. 2 is a framework diagram of an organization of a magnetic field online monitoring module in the transformer substation grounding grid safety state online monitoring system.
Fig. 3 is a framework diagram of the organization of a magnetic field movement detection module in the transformer substation grounding grid safety state online monitoring system.
Fig. 4 is a diagram of an organization framework of a wireless convergence unit in the transformer substation grounding grid safety state online monitoring system.
Illustration of the drawings:
1. a background master station; 2. a wireless convergence unit; 3. a signal transmitting module; 4. a magnetic field online monitoring module; 5. a magnetic field movement detection module; 6. and a magnetic field intensity detection module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: transformer substation's grounding grid safety state on-line monitoring system, including backstage main website 1, wireless unit 2 that assembles, signal emission module 3, magnetic field on-line monitoring module 4 and magnetic field removal detection module 5 of assembling, through internet access between the output of backstage main website 1 and the wireless input of assembling unit 2, the wireless output that assembles unit 2 and signal emission module 3's input electric connection, signal emission module 3's output respectively with the magnetic field on-line monitoring module 4 and through internet access between the input of magnetic field removal detection module 5.
Referring to fig. 1-2, the magnetic field online monitoring module 4 includes a solar panel, a low power consumption CPU, and a magnetic field strength detection module 6, an output end of the solar panel is electrically connected to an input end of a power management module, an output end of the power management module is electrically connected to an input end of a lithium battery, the power management module is electrically connected to the low power consumption CPU in a bidirectional manner, an output end of the magnetic field strength detection module 6 is electrically connected to an input end of the low power consumption CPU, the solar panel converts solar energy into electric energy and then connects to the power management module, the power management module performs charge and discharge management on electric quantity of the lithium battery, the lithium battery serves as a power supply to supply power to the whole system, the magnetic field strength detection module 6 includes a magnetic tunnel sensor and a signal conditioning circuit, the magnetic tunnel sensor can sense a spatial magnetic field strength signal and convert, the signal conditioning circuit (draw the magnetic field intensity signal that the earth mat produced, the filtration field disturbance magnetic field intensity signal) filters voltage signal, enlargies, after the rectification, convert suitable voltage signal and send to low-power consumption CPU, wireless communication module mainly comprises LORA wireless communication module, LORA module has the low power dissipation, the advantage that transmission distance is far away, realize data, the transmission of instruction and the awakening of CPU, CPU is responsible for the collection of voltage, the collection of magnetic field intensity, wireless communication packet group dress, communication instruction is analyzed, device power consumption management.
Referring to fig. 1-3, the magnetic field movement detection module 5 includes a TF card, a low power consumption CPU, a magnetic field strength detection module 6 and a 9-axis sensor, the output ends of the magnetic field strength detection module 6, the 9-axis sensor and a lithium battery are all electrically connected with the input end of the low power consumption CPU, the output end of the low power consumption CPU is electrically connected with the input end of the TF card, the magnetic field strength detection module 6 is composed of a tunnel sensor and a signal conditioning circuit, the tunnel sensor and the signal conditioning circuit are connected by a signal, the magnetic field movement detection device is mainly composed of a portable mobile cart, a magnetic field strength detection body and a display unit, wherein the portable mobile cart is foldable and convenient to carry and move on site, the display unit contains a friendly human-machine interface and voice broadcast, and is convenient for the setting and displaying of the on-site, the magnetic field intensity detects the body by the adapter that charges, the lithium cell, magnetic field intensity detection part, 9 axle sensors and TF card are constituteed, wherein, the adapter that charges is used for charging for the lithium cell, the lithium cell is used for supplying power for whole device, magnetic field intensity detection part comprises magnetic tunnel sensor and signal conditioning circuit, magnetic tunnel sensor can respond to space magnetic field intensity signal, insert signal conditioning circuit after converting magnetic field intensity signal to voltage signal, signal conditioning circuit (draw the magnetic field intensity signal that the ground net produced, the on-the-spot interference magnetic field intensity signal of filtering) filters voltage signal, enlarge, after the rectification, convert suitable voltage signal and send to low-power consumption CPU. The 9-axis sensor is used for calculating the moving direction and displacement of the equipment, and coordinate calibration of the device in the detection process is achieved. The TF card is used to store data (X-coordinate, Y-coordinate and magnetic field strength) during the examination.
Referring to fig. 1-4, the wireless convergence unit 2 includes a solar panel, a magnetic field online monitoring device, a storage battery, a signal transmitting device and a low-power CPU, an output end of the solar panel is electrically connected to an input end of a power management module, an output end of the power management module is electrically connected to an input end of the storage battery, the power management module is bidirectionally electrically connected to the low-power CPU, the low-power CPU is bidirectionally electrically connected to the signal transmitting device through 485 bidirectional communication, the low-power CPU is bidirectionally connected to the magnetic field online monitoring device through LORA bidirectional communication, and communicates with the signal transmitting device, so as to realize functions of power management, voltage and current output management, current access point switching control and the like of the signal transmitting device; the wireless convergence unit 2 communicates with the background master station through a 4G or wireless private network to complete functions of instruction analysis and transmission, data transmission and the like, and the output end of the low-power-consumption CPU is connected with the input end of the background master station 1 through the 4G private network.
The working principle is as follows: the signal transmitting device is a special pilot frequency current source and can output a 0-50A (300-500 Hz) current signal to generate a signal excitation source. The on-line monitoring device of the magnetic field in the on-line monitoring module 4 is arranged above a conductor of the grounding grid according to a topological structure of the on-site grounding grid, the detection module 6 of the magnetic field intensity is used for on-line monitoring the magnetic field intensity of the grounding grid, the detection device of the magnetic field movement in the detection module 5 of the magnetic field movement is composed of a trolley, a magnetic field detection body and a display and is used for detecting the topological structure of the grounding grid and movably detecting the magnetic field intensity of the grounding grid, the wireless convergence unit 2 is a bridge of the background main station 1 and the on-line monitoring device of the magnetic field, the functions of data analysis, instruction receiving and sending, data packet processing and the like of the on-line monitoring device are realized, the background main station 1 is equivalent to the brain of a person, various instructions are generated and sent, data is collected and preprocessed, data is stored, inquired and a result is generated, the power management module carries out charge and discharge management on the electric quantity of the lithium battery, the lithium battery is used as a power supply to supply power for the whole system, the magnetic field intensity detection module 6 consists of a magnetic tunnel sensor and a signal conditioning circuit, the magnetic tunnel sensor can sense a space magnetic field intensity signal, the magnetic field intensity signal is converted into a voltage signal and then is accessed into the signal conditioning circuit, the signal conditioning circuit (extracts the magnetic field intensity signal generated by a grounding network and filters the field interference magnetic field intensity signal) filters, amplifies and rectifies the voltage signal and then converts the voltage signal into a proper voltage signal to be sent to a low-power-consumption CPU, the wireless communication module mainly consists of an LORA wireless communication module, the LORA module has the advantages of low power consumption and long transmission distance, the transmission of data and instructions and the awakening of the CPU are realized, the CPU is responsible for acquiring, the device power consumption management, in the magnetic field movement detection module 5, the magnetic field movement detection device mainly comprises a portable moving trolley, a magnetic field intensity detection body and a display unit, wherein the portable moving trolley is foldable and convenient to carry and move on site, the display unit contains a man-machine friendly interface and voice broadcast, and is convenient for detection personnel to set and display site detection data, the magnetic field intensity detection body comprises a charging adapter, a lithium battery, a magnetic field intensity detection part, a 9-axis sensor and a TF card, wherein the charging adapter is used for charging the lithium battery, the lithium battery is used for supplying power to the whole device, the magnetic field intensity detection part comprises a magnetic tunnel sensor and a signal conditioning circuit, the magnetic tunnel sensor can sense a space magnetic field intensity signal, and the magnetic field intensity signal is converted into a voltage signal and then is accessed into the signal conditioning circuit, the signal conditioning circuit (extracts the magnetic field intensity signal generated by the grounding network and filters the field interference magnetic field intensity signal) filters, amplifies and rectifies the voltage signal, and then converts the voltage signal into a proper voltage signal and sends the proper voltage signal to the low-power-consumption CPU. The 9-axis sensor is used for calculating the moving direction and displacement of the equipment, and coordinate calibration of the device in the detection process is achieved. The TF card is used to store data (X-coordinate, Y-coordinate and magnetic field strength) during the examination.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. Transformer substation's grounding grid safety state on-line monitoring system, including backstage main website (1), wireless unit (2) that assemble, signal emission module (3), magnetic field on-line monitoring module (4) and magnetic field removal detection module (5), its characterized in that: the magnetic field monitoring device is characterized in that the output end of the background main station (1) is connected with the input end of the wireless convergence unit (2) through a network, the output end of the wireless convergence unit (2) is electrically connected with the input end of the signal transmitting module (3), and the output end of the signal transmitting module (3) is respectively connected with the input ends of the magnetic field online monitoring module (4) and the magnetic field mobile detection module (5) through a network.
2. The substation grounding grid safety state online monitoring system according to claim 1, wherein the magnetic field online monitoring module (4) comprises a solar cell panel, a low-power-consumption CPU and a magnetic field intensity detection module (6), an output end of the solar cell panel is electrically connected with an input end of a power management module, an output end of the power management module is electrically connected with an input end of a lithium battery, the power management module is electrically connected with the low-power-consumption CPU in a bidirectional mode, and an output end of the magnetic field intensity detection module (6) is electrically connected with an input end of the low-power-consumption CPU.
3. The transformer substation grounding grid safety state online monitoring system according to claim 1, wherein the magnetic field movement detection module (5) comprises a TF card, a low-power-consumption CPU, a magnetic field strength detection module (6) and a 9-axis sensor, the output ends of the magnetic field strength detection module (6), the 9-axis sensor and a lithium battery are electrically connected with the input end of the low-power-consumption CPU, and the output end of the low-power-consumption CPU is electrically connected with the input end of the TF card.
4. The transformer substation grounding grid safety state online monitoring system according to claim 1, wherein the wireless convergence unit (2) comprises a solar cell panel, a magnetic field online monitoring device, a storage battery, a signal transmitting device and a low-power-consumption CPU, an output end of the solar cell panel is electrically connected with an input end of a power management module, an output end of the power management module is electrically connected with an input end of the storage battery, the power management module is electrically connected with the low-power-consumption CPU in a bidirectional mode, the low-power-consumption CPU is connected with the signal transmitting device through 485 bidirectional communication, and the low-power-consumption CPU is connected with the magnetic field online monitoring device through LORA bidirectional communication.
5. The transformer substation grounding grid safety state online monitoring system according to claim 2, wherein the magnetic field strength detection module (6) is composed of a tunnel sensor and a signal conditioning circuit, and the tunnel sensor is connected with the signal conditioning circuit through a signal.
6. The transformer substation grounding grid safety state online monitoring system according to claim 4, characterized in that the output end of the low-power consumption CPU is connected with the input end of the background master station (1) through a 4G private network.
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| CN202010776534.9A CN111781537A (en) | 2020-08-05 | 2020-08-05 | Transformer substation grounding grid safety state on-line monitoring system |
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| CN202010776534.9A CN111781537A (en) | 2020-08-05 | 2020-08-05 | Transformer substation grounding grid safety state on-line monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624492A (en) * | 2022-04-22 | 2022-06-14 | 西南交通大学 | Method for measuring potential difference of two remote transformer substation ground grids caused by direct current |
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2020
- 2020-08-05 CN CN202010776534.9A patent/CN111781537A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114624492A (en) * | 2022-04-22 | 2022-06-14 | 西南交通大学 | Method for measuring potential difference of two remote transformer substation ground grids caused by direct current |
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