CN113466533A - Lightning current measurement method based on multi-channel mountain area distribution line - Google Patents
Lightning current measurement method based on multi-channel mountain area distribution line Download PDFInfo
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- G—PHYSICS
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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Abstract
The invention discloses a method for measuring lightning current based on a multichannel mountain area distribution line, which has the advantages of high insulation strength, large dynamic range, wide measurement frequency band, strong anti-interference capability, no magnetic saturation, difficult influence of high voltage and high current arc sparks and capability of measuring at any position by adopting an optical current sensing technology, effectively solves the problem that the parameter and accurate positioning of the lightning current are greatly influenced due to the lightning magnetic interference in the lightning current measurement process, and ensures the accuracy of the lightning current measurement.
Description
Technical Field
The invention provides a method for measuring lightning current based on a multi-channel mountain area distribution line, and belongs to the field of power system distribution line management and maintenance.
Background
The lightning disaster is one of natural disasters threatening the safety of human life and property, and the early warning is accurately carried out before the cloud ground flash happens, so that the early warning has very important significance. The research on the lightning protection design of the power transmission line is mainly carried out by means of simulation tests, theoretical analysis, accident research and the like, and actual lightning parameters are lacked in the research. Therefore, lightning current monitoring of the power grid is enhanced, real and effective measurement data are provided for lightning protection research, and the method has extremely important significance for reducing lightning accidents and ensuring safe power supply of the power grid.
For monitoring lightning current of a traditional mountain area distribution line, a magnetic steel bar method, a magnetic tape method, a Rogowski coil measurement method and the like are generally adopted. These are susceptible to interference from lightning magnetic fields, where self-resonance, hysteresis and saturation problems of the current transformer have a great influence on some lightning current parameters and accurate positioning. For example, the amplitude of the voltage is greatly influenced, the small amplitude may cause the shielding failure of the power transmission line, and the large amplitude may cause the lightning induced overvoltage, the transformer substation lightning wave invasion and the like.
Disclosure of Invention
The invention discloses a method for measuring lightning current based on a multichannel mountain area distribution line, which adopts an optical current sensing technology, has the advantages of high insulation strength, large dynamic range, wide measurement frequency band, strong anti-jamming capability, no magnetic saturation, difficult influence of high voltage and high current arc sparks, capability of measuring at any position, and effective solving of the great influence on lightning current parameters and accurate positioning caused by lightning magnetic interference in the lightning current measurement process. The accuracy of lightning current measurement is guaranteed.
The invention discloses a lightning current measuring device based on a multi-channel mountain area distribution line, which is characterized in that:
the lightning current monitoring device comprises a lightning current sensing device, a data acquisition device, a communication module and a monitoring upper computer. Four lightning current sensing devices, a data acquisition device, a communication module (GPRS) and four lightning monitoring devices are in honeycomb arrangement in one area, each sensor device is 10 kilometers away, and meanwhile, each device is attached with one acquisition device and one communication module.
The invention discloses a lightning current measuring method based on a multichannel mountain area distribution line, which comprises the following steps of:
s1, acquiring monitoring data in real time through the four lightning monitoring devices in a honeycomb layout, namely collecting the data;
s2, the data acquisition device carries out analysis calculation-data analysis of the data terminal through the optical current sensing technology;
an optical fiber composite overhead ground wire (OPGW) in the optical current sensing technology places optical fibers in a ground wire of an overhead high-voltage transmission line to form an optical fiber communication network on the transmission line;
in lightning strike, the lightning current flowing through the OPGW can be divided into two parts, namely flowing through the OPGW along the axial direction and flowing through the OPGW along the spiral direction: when the lightning current flows through the OPGW along the spiral direction, the rotation angle of the polarized light is detected by using the analyzer, and the change condition of the lightning current can be known;
when the OPGW accident is not struck by lightning, namely the polarization state in the optical fiber is not changed or is changed slightly; when the OPGW is struck by lightning, instantaneous large current passes through the OPGW, so that polarized light in the optical fiber is obviously changed; the lightning current can be measured by detecting the change of the light polarization state in the optical fiber;
the optical host A, B is respectively connected with two ends of the optical fiber, a section of OPGW ground wire with the length of 5m is intercepted in a lightning stroke experiment, and the other end of the OPGW ground wire is connected with a 10km optical fiber disc in a fusion mode; the other end of the optical fiber disc is connected with an optical host with an analyzer, a beam of continuous single polarization state laser is emitted at the end A, and when the laser passes through the OPGW sleeve, the transmission light polarization state changes along with the change of a magnetic field caused by lightning current;
s3, according to the set time period, the data reaching the time period and the specific acquisition position are obtained;
in order to realize the judgment of lightning stroke fault points, an identification code is set for each edge device, so that the cloud center can conveniently perform functional identification and tracking on a signal source;
and S4, generating early warning information according to the geographical position of the lightning stroke, namely data internal communication.
The steps S3 and S4 further include calibrating the geographic position of the analyzed lightning occurrence, and inferring lightning early warning information according to the calibrated geographic position of the lightning occurrence;
the lightning monitoring devices in the steps S1 and S2 collect data and perform a large amount of signal preprocessing, and finally output a concise calculation result, and then perform concise data interaction with the background server or the cloud server in a wireless manner, and the client terminal performs data interaction with the background server or the cloud server in a wireless manner.
The optical fiber composite overhead ground wire (OPGW) is a sensor structure designed aiming at a through optical path of a 90-degree Faraday optical rotator coupled at a geometric midpoint of a sensing optical fiber in an all-fiber current sensor (FOCS), compared with the FOCS of a traditional basic structure, the temperature sensitivity of the FOCS of the structure is almost independent of the birefringence condition of the optical fiber, and the FOCS has broadband characteristics. The problems of lightning magnetic interference in the lightning current measuring process, self-resonance, lag, saturation and the like of the current transformer are effectively solved. The accuracy of lightning current measurement is guaranteed.
The invention has the advantages that
The optical fiber is placed in the ground wire of the overhead high-voltage transmission line by adopting an optical current sensing technology to form an optical fiber communication network on the transmission line, and the optical fiber communication network has the double functions of the ground wire and communication, and has the advantages of high insulating strength, large dynamic range, wide measurement frequency band, strong anti-interference capability, no magnetic saturation, difficult influence of high-voltage and high-current arc sparks, capability of measuring at any position and the like; the problem that parameters and accurate positioning of lightning current are greatly influenced due to lightning magnetic interference in the lightning current measurement process is effectively solved; and the collected lightning current information can correctly restore the lightning current waveform flowing through the tower branches at the moment of lightning stroke, so that a relation map of several parameters such as an amplitude, a time domain, a frequency domain and the like with accurate signals is obtained, and the accuracy of lightning current measurement is guaranteed.
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Fig. 1 is an optical current sensing schematic of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which do not limit the present invention in any way, and any modifications or changes that can be easily made by a person skilled in the art to the present invention will fall within the scope of the claims of the present invention without departing from the technical solution of the present invention.
Example 1
The invention relates to a lightning current measuring device based on a multi-channel mountain area distribution line, which comprises a lightning current sensing device, a data acquisition device, a communication module and a monitoring upper computer; four lightning current sensing devices, a data acquisition device, a communication module (GPRS) and four lightning monitoring devices are in honeycomb arrangement in one area, each sensor device is 10 kilometers away, and meanwhile, each device is attached with one acquisition device and one communication module.
Example 2
The invention discloses a lightning current measuring method based on a multichannel mountain area distribution line, which utilizes the measuring device in embodiment 1 and comprises the following steps:
s1, acquiring monitoring data in real time through the four lightning monitoring devices in a honeycomb layout, namely collecting the data;
s2, the data acquisition device carries out analysis calculation-data analysis of the data terminal through the optical current sensing technology;
referring to fig. 1, in the optical current sensing technology, an optical fiber composite overhead ground wire (OPGW) is used for placing an optical fiber in a ground wire of an overhead high-voltage transmission line to form an optical fiber communication network on the transmission line; in lightning stroke, the lightning current flowing through the OPGW can be divided into two parts, namely flowing through the OPGW along the axial direction and flowing through the OPGW along the spiral direction; when the lightning current flows through the OPGW along the spiral direction, the rotation angle of the polarized light is detected by using the analyzer, and the change condition of the lightning current can be known; when the OPGW accident is not struck by lightning, namely the polarization state in the optical fiber is not changed or is changed slightly; when the OPGW is struck by lightning, instantaneous large current passes through the OPGW, so that polarized light in the optical fiber is obviously changed; the lightning current can be measured by detecting the change of the light polarization state in the optical fiber; 2. the optical host A, B is respectively connected to two ends of the optical fiber, a section of OPGW ground wire with the length of 5m is intercepted in a lightning stroke experiment, and the other end of the OPGW ground wire is connected with a 10km optical fiber disc in a fusion mode. The other end of the optical fiber disc is connected with an optical host with an analyzer, a beam of continuous single polarization state laser is emitted at the end A, and when the laser passes through the OPGW sleeve, the transmission light polarization state changes along with the change of a magnetic field caused by lightning current;
s3, according to the set time period, the data reaching the time period and the specific acquisition position are obtained;
in order to judge lightning stroke fault points, identification codes are set for each edge device, so that the cloud center can conveniently perform functional identification and tracking on signal sources.
And S4, generating early warning information according to the geographical position of the lightning stroke, namely data internal communication.
The method comprises the steps of S3 and S4, calibrating the geographic position of the lightning after analysis and processing, and inferring lightning early warning information according to the calibrated geographic position of the lightning, wherein the lightning monitoring devices in the steps S1 and S2 collect data and perform a large amount of signal preprocessing processing, finally outputting a concise calculation result, and performing concise data interaction with a background server or a cloud server in a wireless mode, and the client terminal performs data interaction with the background server or the cloud server in a wireless mode.
Claims (4)
1. The utility model provides a based on multichannel mountain area distribution lines thunder current measuring device which characterized in that:
the lightning current monitoring device comprises a lightning current sensing device, a data acquisition device, a communication module and a monitoring upper computer; four lightning current sensing devices, a data acquisition device, a communication module (GPRS) and four lightning monitoring devices are in honeycomb arrangement in one area, each sensor device is 10 kilometers away, and meanwhile, each device is attached with one acquisition device and one communication module.
2. A lightning current measuring method based on a multichannel mountain area distribution line comprises the following steps:
s1, acquiring monitoring data in real time through the four lightning monitoring devices in a honeycomb layout, namely collecting the data;
s2, the data acquisition device carries out analysis calculation-data analysis of the data terminal through the optical current sensing technology;
an optical fiber composite overhead ground wire (OPGW) in the optical current sensing technology places optical fibers in a ground wire of an overhead high-voltage transmission line to form an optical fiber communication network on the transmission line;
in lightning strike, the lightning current flowing through the OPGW can be divided into two parts, namely flowing through the OPGW along the axial direction and flowing through the OPGW along the spiral direction: when the lightning current flows through the OPGW along the spiral direction, the rotation angle of the polarized light is detected by using the analyzer, and the change condition of the lightning current can be known;
when the OPGW accident is not struck by lightning, namely the polarization state in the optical fiber is not changed or is changed slightly; when the OPGW is struck by lightning, instantaneous large current passes through the OPGW, so that polarized light in the optical fiber is obviously changed; the lightning current can be measured by detecting the change of the light polarization state in the optical fiber;
the optical host A, B is respectively connected with two ends of the optical fiber, a section of OPGW ground wire with the length of 5m is intercepted in a lightning stroke experiment, and the other end of the OPGW ground wire is connected with a 10km optical fiber disc in a fusion mode; the other end of the optical fiber disc is connected with an optical host with an analyzer, a beam of continuous single polarization state laser is emitted at the end A, and when the laser passes through the OPGW sleeve, the transmission light polarization state changes along with the change of a magnetic field caused by lightning current;
s3, according to the set time period, the data reaching the time period and the specific acquisition position are obtained;
in order to realize the judgment of lightning stroke fault points, an identification code is set for each edge device, so that the cloud center can conveniently perform functional identification and tracking on a signal source;
and S4, generating early warning information according to the geographical position of the lightning stroke, namely data internal communication.
3. The method for measuring the lightning current based on the multichannel mountain area distribution line as claimed in claim 2, wherein the method comprises the following steps:
the steps between the step S3 and the step S4 further include calibrating the geographical position of the analyzed and processed lightning occurrence, and inferring lightning early warning information according to the calibrated geographical position of the lightning occurrence.
4. The method for measuring the lightning current based on the multichannel mountain area distribution line as claimed in claim 2, wherein the method comprises the following steps:
the lightning monitoring devices in the steps S1 and S2 collect data and perform a large amount of signal preprocessing, and finally output a concise calculation result, and then perform concise data interaction with the background server or the cloud server in a wireless manner, and the client terminal performs data interaction with the background server or the cloud server in a wireless manner.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110018399A (en) * | 2019-05-15 | 2019-07-16 | 武汉康普常青软件技术股份有限公司 | A kind of lightning fault localization method based on optical signal polarization state in transmission line of electricity OPGW |
| CN211718434U (en) * | 2019-11-22 | 2020-10-20 | 广西电网有限责任公司防城港供电局 | Transmission line thunderbolt distributed monitoring system based on OPGW |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110018399A (en) * | 2019-05-15 | 2019-07-16 | 武汉康普常青软件技术股份有限公司 | A kind of lightning fault localization method based on optical signal polarization state in transmission line of electricity OPGW |
| CN211718434U (en) * | 2019-11-22 | 2020-10-20 | 广西电网有限责任公司防城港供电局 | Transmission line thunderbolt distributed monitoring system based on OPGW |
Non-Patent Citations (1)
| Title |
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| 佘文杰: "基于光传感的雷电流测量试验研究", 《通信电源技术》 * |
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