CN114384371A - Service center, monitoring terminal and system for power line fault detection - Google Patents
Service center, monitoring terminal and system for power line fault detection Download PDFInfo
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- CN114384371A CN114384371A CN202111474796.0A CN202111474796A CN114384371A CN 114384371 A CN114384371 A CN 114384371A CN 202111474796 A CN202111474796 A CN 202111474796A CN 114384371 A CN114384371 A CN 114384371A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention discloses a service center, a monitoring terminal and a system for power line fault detection. In the embodiment of the invention, the monitoring terminal adopts a distributed installation mode, so that the monitoring distance is shortened, the signal attenuation problem is solved, the monitoring sensitivity is improved, and the fault positioning during high-resistance grounding can be realized. The embodiment of the invention can quickly position the fault point, reduce the manual line patrol burden, accelerate the line power restoration and reduce the economic loss caused by power failure.
Description
Technical Field
The invention relates to the technical field of power fault detection, in particular to a service center, a monitoring terminal and a system for power line fault detection.
Background
Transmission lines are the fate of the electrical power system and are responsible for transmitting electrical energy. With the increasing expansion of the scale of the power system and the increasing of the number of high-voltage, large-energy and long-distance power transmission lines, once the power transmission lines have faults, the influence on the safe operation of the power system, the industrial and agricultural production and the daily life of people is more and more serious, and therefore, the guarantee of the safe operation of the power transmission lines is very important.
The high-voltage and ultrahigh-voltage transmission lines on the power grid are very long, some transmission lines are hundreds of kilometers long, even some transmission lines are thousands of kilometers long, and the distribution region is wide. The transmission line is exposed in the atmosphere for a long time, and is influenced by weather and environmental conditions, and can flicker under the action of external factors (such as lightning stroke, fog, rain, dirt and the like), so that the transmission line fails, and the transmission line is an inevitable problem in the operation of a power grid.
After a power transmission line breaks down, how to quickly find a fault point and eliminate the fault to recover power supply is a big problem that power grid operation has been paid attention to by people so far. Traditionally, a fault point is searched by means of line patrol, and then the fault is processed. The mode is time-consuming and labor-consuming, and the safe and stable operation of a power supply system and a power transmission line is difficult to ensure.
Disclosure of Invention
The embodiment of the invention provides a service center, a monitoring terminal and a system for power line fault detection, which can improve monitoring sensitivity, realize fault location in high-resistance grounding, reduce the manual line patrol burden, accelerate line power restoration and reduce economic loss caused by power failure.
In a first aspect, an embodiment of the present invention provides a service center for power line fault detection, including a transceiver module and a processing module;
the receiving and transmitting module is used for receiving fault data collected by monitoring terminals at all the electric towers and uploading the fault data to the processing module;
the processing module is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to a user system through the transceiver module.
Optionally, the service center further includes a database, and the processing module is configured to analyze the fault data to obtain a fault type and a fault location, and store the fault type and the fault location in the database.
Optionally, the transceiver module includes a pre-processing module and a web service module;
the pre-processing module receives fault data sent by the monitoring terminal and performs pre-processing;
the web service module is used for communicating with the user system, and the user system accesses the database through the web service module.
Optionally, the monitoring terminal is configured to collect a traveling wave generated by a fault point, and the service center calculates the fault position by using a single-ended traveling wave ranging algorithm or a double-ended traveling wave ranging algorithm.
In a second aspect, an embodiment of the present invention further provides a monitoring terminal for power line fault detection, where the monitoring terminal is disposed at each electric tower, and the monitoring terminal includes a data acquisition module, a control module, a communication module, and a power supply module;
the data acquisition module acquires fault data in a non-contact data acquisition mode;
the control module processes the fault data and sends the fault data to the communication module;
the communication module sends the fault data to the service center;
the power module is used for supplying power to the monitoring terminal.
Optionally, the data acquisition module comprises an electromagnetic field sensor.
Optionally, the power module includes a solar panel and a battery.
Optionally, the monitoring terminals further include a clock synchronization module, configured to implement clock synchronization between the monitoring terminals.
Optionally, the monitoring terminal is configured to collect a traveling wave generated by the fault point, and the service center calculates the fault position by using a single-ended traveling wave ranging algorithm or a double-ended traveling wave ranging algorithm.
In a third aspect, an embodiment of the present invention provides a power line fault detection system, including a monitoring terminal, a service center, and a user system;
the monitoring terminals are arranged at each electric tower and used for acquiring fault data and uploading the fault data to the service center;
and the service center is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to the user system.
The service center for power line fault detection provided by the embodiment of the invention receives fault data collected by monitoring terminals at all electric towers through the transceiver module and uploads the fault data to the processing module, and the processing module is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to the user system through the transceiver module. In the embodiment of the invention, the monitoring terminal adopts a distributed installation mode, so that the monitoring distance is shortened, the signal attenuation problem is solved, the monitoring sensitivity is improved, and the fault positioning during high-resistance grounding can be realized. The embodiment of the invention can quickly position the fault point, reduce the manual line patrol burden, accelerate the line power restoration and reduce the economic loss caused by power failure.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a power line monitoring system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power line monitoring system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of single-ended traveling wave ranging according to an embodiment of the present invention;
fig. 4 is a schematic diagram of double-ended traveling wave ranging according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
Fig. 1 is a schematic structural diagram of an electric power line fault detection system according to an embodiment of the present invention, and as shown in fig. 1, the electric power line fault detection system includes a monitoring terminal 110, a service center 120, and a user system 130.
The monitoring terminals 110 are distributed at each electric tower, and are directly or indirectly connected to the power transmission line, and are configured to collect fault data and upload the fault data to the service center 120 in a wireless communication manner. Specifically, when the power transmission line sends a fault such as a short circuit to ground or a lightning strike, the change of the line current and voltage (i.e., fault data) caused by the fault is collected by the monitoring terminal 110. The embodiment of the invention adopts a distributed installation mode, divides a long line into a plurality of short lines, shortens the monitoring distance, solves the problem of signal attenuation, improves the monitoring sensitivity and can realize fault positioning in high-resistance grounding. In addition, the monitoring terminals 110 can be mutually standby, thereby improving the stability of the system.
The service center 120 is configured to analyze the fault data, determine a fault type and a fault location, and send the fault type and the fault location to the user system 130 through a wireless communication manner. Illustratively, the service center 120 compares the received fault data with the historical data, determines the type of the fault, and calculates the distance from the fault point to the monitoring terminal 110 as the fault location according to the time when the fault data generated by the fault point is received.
The staff prepares corresponding maintenance tools according to the fault types received by the user system 130, and goes to the fault position in time to repair the power transmission line.
The power line fault monitoring system provided by the embodiment of the invention comprises monitoring terminals, a service center and a user system, wherein the monitoring terminals are arranged at all electric towers and used for acquiring fault data and uploading the fault data to the service center, and the service center is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to the user system. The embodiment of the invention adopts a distributed installation mode, shortens the monitoring distance, solves the problem of signal attenuation, improves the monitoring sensitivity and can realize fault positioning in high-resistance grounding. The embodiment of the invention can quickly position the fault point, reduce the manual line patrol burden, accelerate the line power restoration and reduce the economic loss caused by power failure.
Fig. 2 is a schematic structural diagram of another power line monitoring system according to an embodiment of the present invention, and as shown in fig. 2, in some embodiments of the present invention, a monitoring terminal 110 includes a data acquisition module 111, a control module 112, a communication module 113, and a power supply module 114.
The data acquisition module 111 is indirectly connected with the power transmission line, and acquires fault data in a non-contact data acquisition mode. Illustratively, in one embodiment of the invention, the data acquisition module 111 comprises a broadband electromagnetic field sensor. The electromagnetic field sensor is a device which can convert various magnetic fields and the variable quantities thereof into electric signals to be output. The fault data is acquired in a non-contact data acquisition mode, and the influence of secondary loop phase shift on fault position calculation is avoided. In addition, a non-contact data acquisition mode is adopted, so that the monitoring terminal is in non-contact with a high-voltage line, the problems of installation, debugging and maintenance of the monitoring terminal are solved, the interference of strong electromagnetism such as corona and the like and high-altitude severe natural environment is avoided, and the problems of power-on faults and voltage non-current standby line faults are solved.
The control module 112 processes the fault data and sends the fault data to the communication module 113. Specifically, the control module 112 may perform processing such as screening, filtering, and enhancing on the received data to obtain effective fault data, and send the effective fault data to the communication module 113. The communication module 113 may be a General Packet Radio Service (GPRS) module.
The communication module 113 transmits the fault data to the service center 120. Illustratively, the communication module 113 sends the failure data to the service center 120 through GPRS real-time data transmission.
The power module 114 is used for supplying power to the monitoring terminal 110 and supplying power for normal operation of the monitoring terminal 110. Illustratively, in embodiments of the present invention, the power module 114 includes a solar panel and a battery. The charging management of the storage battery and the solar panel is performed through the control module 112. Current induction devices are mostly adopted to take power from a power transmission line to supply power for a monitoring terminal. In the embodiment of the invention, the solar panel and the storage battery are adopted to supply power to the monitoring terminal 110, so that power taking from a power transmission line is avoided, the problem of waveform distortion caused by impedance introduced by a current sensing device to a multi-split power transmission line is solved, secondary faults such as power transmission line fatigue and the like caused by long-term load of the power transmission line are avoided, and the influence of rusting of the current sensing device on power taking is avoided.
In the embodiment of the invention, the monitoring terminal 110 is arranged on the tower, is not in contact with the transmission line, is not required to be installed in a power failure mode, and is low in installation cost.
In some embodiments of the present invention, as shown in fig. 2, the monitoring terminal 110 further includes an environment monitoring module 115, for example, a camera, a temperature sensor, etc., for monitoring the surrounding environment where the electric tower is located, for example, extreme weather such as high wind, snowstorm, high temperature, etc.
In some embodiments of the present invention, as shown in fig. 2, the monitoring terminal 110 further includes a self-detection and alarm module 116, and the self-detection and alarm module 116 can detect itself and send an alarm signal to the service center 120 through the communication module 113 when the monitoring terminal 110 is partially out of order.
In some embodiments of the present invention, as shown in fig. 2, the monitoring terminals 110 further include a clock synchronization module 117 for implementing clock synchronization between the monitoring terminals 110. For example, in the embodiment of the present invention, the clock synchronization module 117 may include a GPS clock synchronization device and a Big Dipper (BDS) clock synchronization device, and a full-precision compensation algorithm is adopted to ensure that the synchronization error of each monitoring terminal 110 is kept within 100ns, that is, the distance measurement precision caused by time factors is within 30 meters, so as to improve the fault location precision.
In some embodiments of the present invention, the service center 120 includes a transceiver module and a processing module 123, and the transceiver module is configured to receive fault data collected by the monitoring terminals located at the electric towers and upload the fault data to the processing module 123. The processing module 123 is configured to analyze the fault data, determine a fault type and a fault location, and send the fault type and the fault location to the user system through the transceiver module.
In some embodiments of the present invention, as shown in FIG. 2, the transceiver module includes a pre-processing module 121 and a web services module 124. The service center 120 also includes a database 122.
The preprocessing module 121 receives data sent by the monitoring terminal 110 through a wireless communication method, and performs preprocessing. The preprocessing may be preprocessing such as filtering and denoising the data, and the embodiment of the present invention is not limited herein.
The processing module 123 is configured to process the pre-processed fault data to obtain a fault type and a fault location, and store the fault type and the fault location in the database 122. For example, the processing module 123 compares the historical data in the database 122 after receiving the fault data, determines the fault type, and calculates the distance between the fault point and the monitoring terminal 110 as the fault location according to the time when the fault data generated by the fault point is received.
The web services module 124 is used to communicate with the user system 130, and the user system 130 accesses the database 122 through the web services module 124.
In the embodiment of the present invention, the service center 120 may also perform statistical analysis on historical failures, prevent a heavy spot area, and reduce the probability of failures.
The establishment of the lightning area distribution diagram can provide data reference for lightning area protection and provide basis for the effect of lightning protection measures.
In addition, no matter what kind of cause causes the disturbance, the service center 120 can carry out statistics, so as to purposefully carry out the investigation of key areas, prevent the expansion of accidents, and achieve the purposes of early warning and protection.
The service center 120 can combine the historical failure information with the geographic information system to visually display the failure section and information.
The service center 120 may also collect and count state information of the monitoring terminal 110, such as solar energy, battery, temperature, GPS state, GPRS signal strength, and the like.
The service center 120 may also implement remote value maintenance and program upgrade functions for the terminals.
As shown in fig. 2, in the embodiment of the present invention, the user system 130 includes a computer access terminal 131 and a mobile receiving terminal 132. The computer-wide terminal may access the database 122 through a web services module 124. The mobile receiving terminal 132 may receive the type and location of the fault from the service center 120.
In the embodiment of the invention, the monitoring terminal is used for collecting the traveling wave generated by the fault point. The transmission line can be considered to be composed of a large number of distributed inductances and capacitances if the transmission loss is neglected (the distributed resistance and the conductance to the ground are neglected). Assuming that the beginning end of a section of line is M and the end of the section of line is N, and a ground fault occurs at a certain point P in the middle of the line, it is equivalent to connect an equivalent power supply at the point P, and the voltage of the equivalent power supply is equal to the voltage before the fault at the point P and is opposite to the voltage before the fault at the point P. Assuming that a fault occurs when t is equal to 0, for a transmission line with distributed parameters, a fault equivalent power supply charges a line capacitor, an electric field is established around a lead and adjacent capacitors are charged, the distributed capacitors of the line are sequentially charged, and the process is like a voltage wave propagating along the line at a certain speed. Simultaneously, with the charging and discharging of the capacitor, current flows through the line distributed inductor, and a current wave is transmitted along the line. Therefore, through the above analysis, after the line fault, a voltage traveling wave and a current traveling wave are propagated to both ends of the line from the fault point.
In some embodiments of the invention, the service center calculates the fault location using a single-ended traveling wave ranging algorithm. The single-ended traveling wave distance measurement is to install a monitoring terminal at one end M of a line and calculate the distance between a measurement point and a fault point by using the time difference between a first traveling wave and a second reflected traveling wave measured when the line has a fault. Fig. 3 is a schematic diagram of single-ended traveling wave ranging according to an embodiment of the present invention, as shown in fig. 3, a monitoring terminal is installed at an M point, and a first traveling wave measured at the M point is i1，i1Two reflections occur at point M and fault point F, again measured by point M, then this time difference is twice the MF distance, so the fault point locations are as follows:
wherein D isMFAnd v is the distance from the fault point to the point M, v is the transmission speed of the traveling wave in the transmission line, and delta t is the time difference between the first traveling wave and the second traveling wave received by the monitoring terminal.
What has been considered above is the case where the point of failure is relatively close to point M, in fact if it is the point of failureF is closer to point N, then the second traveling wave measured should be i5. Assuming that the distance of MN is L, it can be calculated that if the distance M from the F point is less than L/2, the second traveling wave is i3Otherwise the second travelling wave is i5The calculation formulas for these two fault distances are different.
If there is a line on M, then i1Will transmit, and the transmitted traveling wave will be reflected back at the far end to form i4，i4Ratio of possible to i3Early measured by the M-segment device. As can be seen from the above, the single-ended measured traveling wave is complicated, and in some cases, it is difficult to identify the type of the second traveling wave, and the error of the ranging result is large.
In another embodiment of the invention, the service center calculates the fault location using a double ended traveling wave ranging algorithm. Fig. 4 is a schematic diagram of double-end traveling wave ranging according to an embodiment of the present invention, and as shown in fig. 4, the double-end traveling wave ranging is implemented by installing traveling wave ranging devices (i.e., monitoring terminals) at both ends of a line and calculating a fault point position by detecting a time difference between arrival of a first traveling wave at both ends. As shown in fig. 4, a fault occurs at a point K in the line, a first traveling wave moves from the point K to an end M and an end N, a monitoring terminal is installed at each of the point M and the point N, a time point at which the first traveling wave is received is recorded, and a fault point position can be calculated by the following formula:
wherein D isMKDistance of fault point K from point M, TMTime T of the first travelling wave received by the monitoring terminal of M pointNAnd the time of the first traveling wave received by the monitoring terminal at the point N, L is the distance between the point M and the point N, and v is the transmission speed of the traveling wave in the power transmission line.
From the above it can be seen that double ended travelling wave ranging requires only the identification of the first travelling wave, the principle is simple and easy to implement, but this method requires high precision real time clocks in the devices at both ends, for example about 300km/ms for overhead line wave speed, then a 150m error per us time difference is introduced. Therefore, in the embodiment of the invention, each monitoring terminal adopts GPS and Beidou clock synchronization, so that the synchronization error of each monitoring terminal in time difference can be kept within 100ns, and the algorithm can be realized.
In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in a descriptive sense or positional relationship based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A service center for power line fault detection is characterized by comprising a transceiver module and a processing module;
the receiving and transmitting module is used for receiving fault data collected by monitoring terminals at all the electric towers and uploading the fault data to the processing module;
the processing module is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to a user system through the transceiver module.
2. The service center according to claim 1, further comprising a database, wherein the processing module is configured to analyze the fault data to obtain a fault type and a fault location, and store the fault type and the fault location in the database.
3. The service center of claim 2, wherein the transceiver module comprises a pre-processing module and a web services module;
the pre-processing module receives fault data sent by the monitoring terminal and performs pre-processing;
the web service module is used for communicating with the user system, and the user system accesses the database through the web service module.
4. The service center of claim 1, wherein the monitoring terminal is configured to collect traveling waves generated by a fault point, and the service center calculates the fault location by using a single-ended traveling wave ranging algorithm or a double-ended traveling wave ranging algorithm.
5. A monitoring terminal for power line fault detection is characterized in that the monitoring terminal is arranged at each electric tower and comprises a data acquisition module, a control module, a communication module and a power supply module;
the data acquisition module acquires fault data in a non-contact data acquisition mode;
the control module processes the fault data and sends the fault data to the communication module;
the communication module sends the fault data to the service center;
the power module is used for supplying power to the monitoring terminal.
6. The monitoring terminal of claim 5, wherein the data acquisition module comprises an electromagnetic field sensor.
7. The monitoring terminal of claim 5, wherein the power module comprises a solar panel and a battery.
8. The monitoring terminal of claim 5, further comprising a clock synchronization module configured to implement clock synchronization between the monitoring terminals.
9. The monitoring terminal according to claim 5, wherein the monitoring terminal is configured to collect a traveling wave generated by a fault point, the monitoring terminal is configured to collect a traveling wave generated by the fault point, and the service center calculates the fault location by using a single-ended traveling wave ranging algorithm or a double-ended traveling wave ranging algorithm.
10. A power line fault detection system is characterized by comprising a monitoring terminal, a service center and a user system;
the monitoring terminals are arranged at each electric tower and used for acquiring fault data and uploading the fault data to the service center;
and the service center is used for analyzing the fault data, determining the fault type and the fault position and sending the fault type and the fault position to the user system.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389854A (en) * | 2022-10-25 | 2022-11-25 | 智洋创新科技股份有限公司 | Safety monitoring system and method for direct-current power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115389854A (en) * | 2022-10-25 | 2022-11-25 | 智洋创新科技股份有限公司 | Safety monitoring system and method for direct-current power supply system |
| CN115389854B (en) * | 2022-10-25 | 2023-03-21 | 智洋创新科技股份有限公司 | Safety monitoring system and method for direct-current power supply system |
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