CN102707135A - Lightning current online monitoring system of overhead transmission line based on differential ring - Google Patents
Lightning current online monitoring system of overhead transmission line based on differential ring Download PDFInfo
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- CN102707135A CN102707135A CN2012102192327A CN201210219232A CN102707135A CN 102707135 A CN102707135 A CN 102707135A CN 2012102192327 A CN2012102192327 A CN 2012102192327A CN 201210219232 A CN201210219232 A CN 201210219232A CN 102707135 A CN102707135 A CN 102707135A
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Abstract
The invention provides a lightning current online monitoring system of an overhead transmission line based on a differential ring, relating to a structure of the lightning current online monitoring system of the overhead transmission line. The lightning current online monitoring system mainly comprises a current sensor, a lightning stroke signal collecting unit, a data receiving and GPRS (General Packet Radio Service) transmission unit, a power supply unit and a user unit. With the adoption of the lightning current online monitoring system provided by the invention, lightning current of the overhead transmission line is monitored online in a non-contact manner. The lightning current online monitoring system has the advantages of being safe to use, reliable in work, intelligent in operation, high in monitoring accuracy, high in sensitivity and high in precision, can help staff to rapidly troubleshoot a lightning fault of the overhead transmission line to reduce loss, and has the characteristics of simple circuit structure, low cost and convenience in popularization and application and the like. The lightning current online monitoring system provided by the invention can be widely applied to the lightning current online monitoring system of the overhead transmission line, and is particularly suitable for the lightning current online monitoring system of the 110-500 kV high-voltage overhead transmission line.
Description
Technical field
The invention belongs to electric system electrical equipment online monitoring technical field, be specifically related to the structure of the lightning current on-line monitoring system of overhead transmission line.
Background technology
The overhead transmission line broad covered area is erected in the air again, very easily is struck by lightning and causes power outage.In order to reduce the damage to crops caused by thunder accident, improve the reliability of power system power supply, must take effective lightning protection measure.The lightning current parameter has important effect in the overhead transmission line lightning protection, the lightning current parameter is not only the basis of electric system lightning Protection Design accurately, still studies the prerequisite of thunder and lightning characteristic, analysis damage to crops caused by thunder accident etc.China's lightning current values of parameters mainly is from some areas path monitoring and reckoning indirectly at present, has the lightning current characteristics that significant limitation can not reflect electric system fully.The direct monitoring of extensively carrying out lightning current obtains lightning current parameter accurately, can effectively solve the difficult problem that the lightning current parameter lacks, and guarantees the safe and stable operation of electric system, improves power supply reliability, has very important Practical significance.
The lightning current on-line monitoring system of existing overhead transmission line; Like application number is 201010265316.5 " a kind of overhead transmission line lightning current and lightning voltage waveform parameter on-Line Monitor Device ", and the disclosed device of this patent mainly comprises voltage sensor, current sensor, power taking coil, voltage conditioning and energy-storage module, signals collecting and processing module, GPRS module.Monitoring system is directly installed on the sub-conductor of overhead transmission line single-phase transmission line or split conductor; Current sensor adopts from integration jaw formula rogowski coil; Sensitivity is 0.17V/kA; Bandwidth is 100Hz ~ 5MHz, can monitor amplitude of lightning current 5kA ~ 200kA, and the online power supply mode of signals collecting and processing module and GPRS module is based on the direct power supply of jaw formula Rogovski power taking coil and the mode that the power supply of lithium electronic battery combines.This device major defect is: 1. current sensor adopts from integration jaw formula rogowski coil; Be directly installed on the sub-conductor of overhead transmission line single-phase transmission line or split conductor; Normal operation to overhead transmission line brings danger, has limited the practicality of this device; 2. current sensor bandwidth maximum cutoff frequency is lower, is unfavorable for the lightning current waveform that contains a large amount of high fdrequency components is monitored, and can make the distortion of original lightning current waveform, can not monitor the lightning current parameter exactly; 3. it is higher that current sensor is monitored minimum amplitude of lightning current, limited the monitoring to low amplitude value lightning current waveform, can not solve the difficult problem that the lightning current parameter lacks fully; 4. the power supply mode of device is based on the direct power supply of jaw formula Rogovski power taking coil and the mode that the power supply of lithium electronic battery combines; Electric energy through jaw formula Rogovski power taking coil is obtained is less; And lithium electronic battery cost is high, capacity is little; Can not guarantee that device is operate as normal for a long time to the long-term power supply of device, particularly to the overhead transmission line in the higher areas of power requirement such as area with more lightning activities.
Summary of the invention
The objective of the invention is weak point, a kind of overhead transmission line lightning current on-line monitoring system based on differential ring is provided to the lightning current on-line monitoring system of existing overhead transmission line.The present invention has contactless lightning current monitoring; Current sensor highly sensitive (0.02 ~ 0.1V/kA), broadband (300Hz ~ 25MHz), wide amplitude of lightning current monitoring range (1kA ~ 100kA), multi-channel high-speed sampling (3 ~ 4 path 10 M sampling rate), sampling with high precision (10 ~ 12 bipolaritys samplings); Power supply safety is normal, can guarantee characteristics such as its long-term operate as normal.
Realize the technical scheme of the object of the invention: a kind of overhead transmission line lightning current on-line monitoring system based on differential ring mainly comprises current sensor, lightning strike signals collecting unit, Data Receiving and GPRS transmission unit, power supply unit, subscriber unit.It is characterized in that:
Described current sensor is installed on the overhead transmission line line pole tower cross-arm and perpendicular to three-phase conducting wire 1 ~ 5m place.Described current sensor is the differential ring current sensor, comprises extension line, junction box, screening can, shielding inner casing, differential ring coil, integrating resistor, coaxial fitting, concentric cable.Described shielding inner casing, screening can and junction box's material is aluminium.Described shielding inner casing be shaped as upper end and bottom all with the hollow cylinder housing of outer chimb.The wall thickness of the hollow cylinder housing of described shielding inner casing is 2 ~ 10mm, highly is that 40 ~ 200mm, hollow internal diameter are 40 ~ 200mm; The width of chimb is that 4 ~ 10mm, thickness are 3 ~ 10mm outside the upper end of said shielding inner casing; The width of chimb is 2 ~ 10mm, thickness 6 ~ 14mm outside the bottom of said shielding inner casing.Described shielding inner casing is in order to the skeleton as the differential ring coil.The upper end of chimb is provided with the buckle of indent outside the upper end of described shielding inner casing, is connected in order to the evagination buckle chucking with described screening can upper end.The copper core enameled wire that described differential ring coil employing line directly is 0.5 ~ 1.5mm evenly is wound on the outside surface of described shielding inner casing, and the number of turn of said differential ring coil is 60 ~ 400 circles, and internal diameter is 45 ~ 205mm.Draw through said extension line at the two ends of described differential ring coil, carries out signals collecting in order to utilize Faraday's electromagnetic induction law that lightning current is converted into voltage analog signal.Described screening can is installed in the outside of described differential ring coil; Described screening can be shaped as the hollow cylinder housing; The wall thickness of the hollow cylinder housing of described screening can is 2 ~ 10mm; Highly be 37 ~ 186mm, the external diameter of the outer chimb of internal diameter and described shielding inner casing lower end is complementary.In a side of described screening can and described shielding inner casing, also corresponding respectively axis direction is provided with the slit that a width is the perforation of 1 ~ 2mm, the monitoring accuracy that influences said current sensor in order to prevent to form eddy current.Be provided with the buckle of protrusion in described screening can upper end, described screening can is connected with the indent buckle chucking of the outer chimb lower end of described shielding inner casing upper end through the buckle of this protrusion, gets in the described current sensor in order to prevent rainwater.The lower end of described screening can is affixed through chimb outside the bottom of screw and described shielding inner casing.Lower end at the opposite side of described screening can is provided with the manhole that a radius is 5 ~ 10mm (being fairlead), so that the extension line at said differential ring coil two ends is drawn.The hollow cylinder housing that described junction box does not seal for two ends.Said junction box's length is that 20 ~ 30mm, wall thickness are that the aperture of the fairlead of 3 ~ 5mm, internal diameter and said screening can lower end is complementary, and a described closed end is fixed in the fairlead place of said screening can lower end.Described integrating resistor (being that resistance is the noninductive resistance of 0.1 ~ 5 Ω) is installed in the described junction box; Described coaxial fitting is fixed in said junction box's outer end.One end extension line of described differential ring coil and described integrating resistor one end and connect after; Be connected with the heart yearn of described coaxial fitting again; The other end extension line of described differential ring coil and the described integrating resistor other end and connect after; Be connected with the ground wire of described coaxial fitting again; The other end of described concentric cable is connected with the BNC passage of described lightning strike signals collecting unit, and the voltage analog signal that flows in order to the induction lightening with the collection of differential ring coil flows to described lightning strike signals collecting unit.
Described lightning strike signals collecting unit is installed in the rainproof case at overhead transmission line line pole tower middle part.Described lightning strike signals collecting unit comprises that BNC passage, signal condition, data sampling processing module and FPGA microcontroller, bus control unit, debugging are with serial ports, RS232 communication serial ports, storer, real-time clock.The input end of described BNC passage is connected with described current sensor through 4 concentric cable, in order to realize the identification of lightning fault pattern, can help the quick line walking of staff to handle the lightning fault point, reduces the thunderbolt economic loss brought by power failure.The input end of described signal condition is connected through 4 leads respectively with the output terminal of described BNC passage, and the voltage analog signal that flows in order to the induction lightening with the collection of differential ring coil flows to the signal condition in the described lightning strike signals collecting unit.The output terminal of described signal condition is connected through 4 leads respectively with the input end of described data sampling processing module; In order to the voltage analog signal after dividing potential drop, the Filtering Processing is delivered to described data sampling processing module, can improve the sampling antijamming capability.The input end of described data sampling processing module (commercial element) also is connected with described bus control unit output terminal through lead; In order under the adjusting of described bus control unit the voltage analog signal after dividing potential drop, the Filtering Processing is being converted into digital signal, realize 10 ~ 12 bipolarity sampling with high precision, 10MHz high-speed sampling.The output terminal of described data sampling processing module is connected with the input end of FPGA through lead, in order to digital signal is delivered to described FPGA microcontroller.The input end of described FPGA microcontroller is connected with the output terminal of described data sampling processing module and said real-time clock respectively through lead respectively; In order to realize functions such as Data Receiving, input, signal extraction; Accurately quick control digital sampling and processing and storer realize that multi-channel high-speed sampling function is to guarantee to obtain fast the lightning current parameter comprehensively.The output terminal of described FPGA microcontroller is connected with described bus control unit through lead, in order to control signal is sent to said bus control unit.The output terminal of described bus control unit is connected through the input end of lead with described data sampling processing module, in order to realize the control to said data sampling processing module.The output terminal of described FPGA microcontroller is connected with described RS232 communication serial ports and described storer with serial ports with described debugging respectively through lead respectively.Described debugging is used in order to system configuration and when debugging with serial ports; Described RS232 communication serial ports in order to the voltage analog signal after handling be transferred to described Data Receiving and GPRS transmission unit, realize the asynchronous transmission of sampled data; Said storer is realized the data storage function of exchange.
Described Data Receiving and GPRS transmission unit are installed in the rainproof case at overhead transmission line line pole tower middle part.Described Data Receiving and GPRS transmission unit comprise flush bonding processor, system bus, system storage, GPS receiving element, logic control element, GRPS antennal interface.Described flush bonding processor, system bus, system storage, GPS receiving element, logic control element, GRPS antennal interface are commercial element.On described flush bonding processor, be equiped with described RS232 serial ports and described expansion serial ports RS232; Described flush bonding processor is connected with the RS232 communication serial ports of described thunderbolt information acquisition unit with lead through the RS232 serial ports, in order to realize exchanges data; The expansion serial ports RS232 of described flush bonding processor in order to when the system extension and other flush bonding processors realize data communications.Be connected through described system bus between described flush bonding processor, described system storage, described GPS receiving element, described logic control element, the described GPRS antennal interface, in order to realize the data transmission between each unit interface.In described logic control element, be equiped with the multi-functional I/O mouth and the Universal LED display interface of reservation, in order to the status monitoring in the operation debug process.Described GPRS antennal interface is connected with described system bus through lead, in order to realize wireless transmission function.
Described power supply unit comprises power-supply controller of electric, solar panel, accumulator, power module.Described power-supply controller of electric and solar panel and accumulator and power module are commercial element.Described power-supply controller of electric, described accumulator, described power module are installed in the rainproof case at overhead transmission line line pole tower middle part; Said solar panel is installed on the same shaft tower of said rainproof case.Described power-supply controller of electric is connected with described solar panel, described accumulator, described power module respectively through power lead respectively; In order under the regulating action of institute's lectotype, intelligently described accumulator, described solar panel are adjusted duty to realize said power module uninterrupted power supply; Can guarantee the power supply reliably and with long-term of on-line monitoring system, ensure system of the present invention operate as normal for a long time.The output terminal of described solar panel is connected with described power-supply controller of electric input end through power lead, in order to delivering to said power-supply controller of electric from the direct current that sunlight transforms; Described solar cell power output plate is 40 ~ 60W.Described accumulator is connected with said power-supply controller of electric through lead, in order to store and supply of electrical energy; Described accumulator capacity is 34AH ~ 55AH.Said power module input end is connected with the output terminal of described power-supply controller of electric through power lead, realizes said power module power supply.The output terminal of said power module is connected with GPRS transmission unit input end with described lightning strike signals collecting unit and described Data Receiving respectively through lead respectively; The 12V DC voltage is converted into 4 kinds of DC voltages of 5V, 3.3V, 2.5V, 1.8V, for described Data Receiving and GPRS transmission unit and described lightning strike signals collecting unit provide power supply.
Described subscriber unit comprises the Internet, user terminal, ftp server.Described ftp server is placed in the pulpit; Described user terminal is placed in the user and uses indoor.Described the Internet is the far-end public internet, is connected with described ftp server with described user terminal through netting twine, carries out the wireless messages transmission.Described ftp server is the PC that NetAssist software is housed, and can in time obtain the lightning current parameter from described the Internet and also guarantee from public internet, can have access to this PC.Said user terminal is a monitoring system software, and said user terminal is connected with described the Internet through netting twine, from described ftp server, extracts the lightning current parameter and carries out longer-term storage and Treatment Analysis through described the Internet at any time.
Lightning current on-line monitoring system of the present invention has contactless lightning current monitoring; Current sensor sensitivity is that 0.02 ~ 0.1V/kA, frequency band are that 300Hz ~ 25MHz, amplitude of lightning current monitoring range are that 1kA ~ 100kA, high-speed sampling port number are that 3 ~ 4 passages, sampling rate are that 10M, precision figure place are 10 ~ 12 bipolaritys; Power supply safety is normal; Can guarantee its long-term operate as normal etc., concrete parameter is confirmed according to the needs that overhead transmission line is installed.
After the present invention adopts above-mentioned technical scheme, mainly have following effect:
1, the present invention adopts the differential ring current sensor, thereby has realized the Non-contact and On-line monitoring of overhead transmission line lightning current.Simultaneously, because differential ring current sensor volume is little, light weight can not brought influence to the shaft tower prototype structure, can not increase the lightning strike probability of shaft tower again, thereby the security of operation that does not have traditional rogowski coil and brought is dangerous, safe in utilization.
2, the present invention adopts multichannel collecting lightning current waveform to realize the identification of lightning fault pattern.When circuit generation shielding fault, the phase sensor waveform recorded amplitude of being struck by lightning is maximum, and polarity is opposite mutually with vicinity, and is identical with third phase polarity; When circuit generation counterattack accident, fault phase waveform recorded amplitude is maximum, but three-phase polarity is identical.Waveforms amplitude and polarity through the sensor record of installing from shaft tower three-phase cross-arm are analyzed; Can realize the identification of lightning fault pattern; Monitoring accuracy is high, and can help the quick line walking of staff to handle the lightning fault point, reduces the thunderbolt economic loss brought by power failure.
3, the present invention adopts the FPGA microcontroller with functions such as the Data Receiving that realizes each passage, input, signal storage; Ability is quick control digital sampling and processing and storer accurately; Realize that multi-channel high-speed sampling function is to guarantee to obtain fast the lightning current parameter comprehensively; Compare with the control mode of Traditional use IC device, have advantages such as circuit structure is simple, processing speed is fast, integrated level is high, cost is low, easy to utilize.
4, the present invention adopts the power supply mode of " solar panel+accumulator+power-supply controller of electric+power module " version.Under institute's lectotype of power-supply controller of electric was regulated, when sunny, solar panel charged to accumulator on the one hand, carried out voltage through power module on the other hand and transformed the back to lightning strike signals collecting unit and Data Receiving and the power supply of GPRS transmission unit; When sunlight lacked, accumulator began directly to carry out voltage through power module and transforms the back to lightning strike signals collecting unit and Data Receiving and the power supply of GPRS transmission unit.Therefore, can guarantee the power supply reliably and with long-term of on-line monitoring system, ensure system of the present invention operate as normal for a long time.
5, the present invention adopts the GPS receiving element; Thereby can trigger time when obtaining obtaining the lightning current waveform geography information such as (precision is a second level), longitude and latitude automatically; Precision is high; Can realize thunder and lightning location and the lightning current waveform of Inversion Calculation lightning strike spot on the overhead transmission line, help the staff to investigate the lightning fault of overhead transmission line fast, reduce the loss that the lightning fault maintenance brings.
6, the present invention has realized the Non-contact and On-line monitoring of overhead transmission line lightning current; Reliable operation; Operative intelligence; Current sensor is highly sensitive, the overhead transmission line lightning current on-line monitoring system of broadband, wide amplitude of lightning current monitoring range, multi-channel high-speed sampling, sampling with high precision; Overhead transmission line lightning current on-line monitoring system of the present invention has guaranteed that the direct monitoring that can extensively carry out lightning current obtains lightning current parameter accurately, can effectively solve the difficult problem that the lightning current parameter lacks.
The present invention can be widely used in the lightning current on-line monitoring of overhead transmission line, particularly is applicable to the high pressure overhead power line lightning current on-line monitoring of 110kV ~ 500kV.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the structural representation of current sensor of the present invention;
Fig. 3 is A-A diagrammatic cross-section of Fig. 2;
Fig. 4 is the theory diagram of lightning strike signals collecting unit among Fig. 1;
Fig. 5 is the theory diagram of Data Receiving and GPRS transmission unit among Fig. 1;
Fig. 6 is in the three-phase lightning current waveform figure of actual measurement in 2: 42: 30 morning of on April 24th, 2012 for the Da Lei west line 19# shaft tower of embodiment 1.
Among the figure: 1 current sensor, 2 lightning strike signals collecting units, 3 power modules, 4 accumulators, 5 power-supply controller of electric, 6 solar panels; 7 power supply units, 8 Data Receiving and GPRS transmission unit, 9 the Internets, 10 user terminals, 11 ftp servers, 12 subscriber units; 13 extension lines, 14 junction boxes, 15 screening cans, 16 differential ring coils, 17 shielding inner casings, 18 integrating resistors; 19 coaxial fittings, 20 concentric cable, 21 BNC passages, 22 signal conditions, 23 data sampling processing modules; 24 FPGA microcontrollers, serial ports, 26 RS232 communication serial ports, 27 storeies, 28 real-time clocks are used in 25 debugging; 29 bus control units, 30 RS232 serial ports, 31 flush bonding processors, 32 expansion serial ports RS232,33 logic control elements; 34 Universal LED display interfaces, 35 GPS receiving elements, 36 system storages, 37 GRPS antennal interfaces, 38 system buss.
Embodiment
Below in conjunction with embodiment, further specify the present invention.
Embodiment 1
Shown in Fig. 1 ~ 5; A kind of overhead transmission line lightning current on-line monitoring system based on differential ring that is used for 110kV mainly comprises current sensor 1, lightning strike signals collecting unit 2, Data Receiving and GPRS transmission unit 8, power supply unit 7, subscriber unit 12.It is characterized in that:
Described current sensor 1 is installed on the overhead transmission line line pole tower cross-arm and perpendicular to three-phase conducting wire 1.4m place.Described current sensor 1 is the differential ring current sensor, comprises extension line 13, junction box 14, screening can 15, shielding inner casing 17, differential ring coil 16, integrating resistor 18, coaxial fitting 19, concentric cable 20.Described shielding inner casing 17, screening can 15 and junction box's 14 material is aluminium.Described shielding inner casing 17 be shaped as upper end and bottom all with the hollow cylinder housing of outer chimb.The wall thickness of the hollow cylinder housing of described shielding inner casing 17 is 4mm, highly is 58mm for 120mm, hollow internal diameter; The width of chimb is that 4mm, thickness are 6mm outside the upper end of said shielding inner casing 17; The width of chimb is 4mm, thickness 8mm outside the bottom of said shielding inner casing 17.Described shielding inner casing 17 is in order to the skeleton as differential ring coil 16.The upper end of chimb is provided with the buckle of indent outside the upper end of described shielding inner casing 17, in order to be connected with the evagination buckle chucking of described screening can 15 upper ends.Described differential ring coil 16 adopts line directly for the copper core enameled wire of 1.2mm evenly is wound on the outside surface of described shielding inner casing 17, and the number of turn of said differential ring coil 16 is 70 circles, and internal diameter is 66mm.Draw through said extension line 13 at the two ends of described differential ring coil 16, carries out signals collecting in order to utilize Faraday's electromagnetic induction law that lightning current is converted into voltage analog signal.Described screening can 15 is installed in the outside of described differential ring coil 16; Described screening can 15 be shaped as the hollow cylinder housing; The wall thickness of the hollow cylinder housing of described screening can 15 is 4mm; Highly be 118mm, the external diameter of the outer chimb of internal diameter and described shielding inner casing 17 lower ends is complementary.In a side of described screening can 15 and described shielding inner casing 17, also corresponding respectively axis direction is provided with the slit that a width is the perforation of 1mm, the monitoring accuracy that influences said current sensor 1 in order to prevent to form eddy current.Be provided with the buckle of protrusion in described screening can 15 upper ends; Described screening can 15 is connected with the indent buckle chucking of the outer chimb lower end of described shielding inner casing 17 upper ends through the buckle of this protrusion, gets in the described current sensor 1 in order to prevent rainwater.The lower end of described screening can 15 is affixed through chimb outside the bottom of screw and described shielding inner casing 17.Lower end at the opposite side of described screening can 15 is provided with the manhole that a radius is 5mm (being fairlead), so that the extension line 13 at said differential ring coil 16 two ends is drawn.The hollow cylinder housing that described junction box 14 does not seal for two ends.Said junction box's 14 length is that 20mm, wall thickness are that the aperture of the fairlead of 3mm, internal diameter and said screening can 15 lower ends is complementary, and a described closed end is fixed in the fairlead place of said screening can 15 lower ends.Described integrating resistor 18 (being that resistance is the noninductive resistance of 0.5 Ω) is installed in the described junction box 14; Described coaxial fitting 19 is fixed in said junction box's 14 outer end.One end extension line 13 of described differential ring coil 16 is with described integrating resistor 18 1 ends and after connecing; Heart yearn with described coaxial fitting 19 is connected again; The other end extension line 13 of described differential ring coil 16 is with described integrating resistor 18 other ends and after connecing; Ground wire with described coaxial fitting 19 is connected again; The other end of described concentric cable 20 is connected with the BNC passage 21 of described lightning strike signals collecting unit 2, and the voltage analog signal that flows in order to the induction lightening that differential ring coil 16 is gathered flows to described lightning strike signals collecting unit 2.
Described lightning strike signals collecting unit 2 is installed in the rainproof case at overhead transmission line line pole tower middle part.Described lightning strike signals collecting unit 2 comprises that BNC passage 21, signal condition 22, data sampling processing module 23 and FPGA microcontroller 24, bus control unit 29, debugging are with serial ports 25, RS232 communication serial ports 26, storer 27, real-time clock 28.Described BNC passage 21 is connected with described current sensor 1 through 4 concentric cable 20, in order to realize the identification of lightning fault pattern, can help the quick line walking of staff to handle the lightning fault point, reduces the thunderbolt economic loss brought by power failure.The input end of described signal condition 22 is connected through 4 leads respectively with the output terminal of BNC passage 21, and the voltage analog signal that flows in order to the induction lightening that differential ring coil 16 is gathered flows to the signal condition 22 in the described lightning strike signals collecting unit 2.The output terminal of described signal condition 22 is connected through 4 leads with the input end of described data sampling processing module 23; In order to the voltage analog signal after dividing potential drop, the Filtering Processing is delivered to described data sampling processing module 23, can improve the sampling antijamming capability.The input end of described data sampling processing module 23 (commercial element) also is connected with described bus control unit 29 output terminals through lead; In order under the adjusting of described bus control unit 29 voltage analog signal after dividing potential drop, the Filtering Processing is being converted into digital signal, realize 10 ~ 12 bipolarity sampling with high precision, 10MHz high-speed sampling.The output terminal of described data sampling processing module 23 is connected with the input end of FPGA through lead, in order to digital signal is delivered to described FPGA microcontroller 24.The input end of described FPGA microcontroller 24 is connected with the output terminal of described data sampling processing module 23 and said real-time clock 28 respectively through lead respectively; In order to realize functions such as Data Receiving, input, signal extraction; Accurately quick control digital sampling and processing and storer 27 realize that multi-channel high-speed sampling function is to guarantee to obtain fast the lightning current parameter comprehensively.The output terminal of described FPGA microcontroller 24 is connected with described bus control unit 29 input ends through lead, in order to control signal is sent to said bus control unit 29.The output terminal of described bus control unit 29 is connected through the input end of lead with described data sampling processing module 23, in order to realize the control to said data sampling processing module 23.The output terminal of described FPGA microcontroller 24 is connected with described RS232 communication serial ports 26 and described storer 27 with serial ports 25 with described debugging respectively through lead respectively.Described debugging is used in order to system configuration and when debugging with serial ports 25; Described RS232 communication serial ports 26 in order to the voltage analog signal after handling be transferred to described Data Receiving and GPRS transmission unit 8, realize the asynchronous transmission of sampled data; Said storer is realized the data storage function of exchange.
Described Data Receiving and GPRS transmission unit 8 are installed in the rainproof case at overhead transmission line line pole tower middle part.Described Data Receiving and GPRS transmission unit 8 comprise flush bonding processor 31, system bus 38, system storage 36, GPS receiving element 35, logic control element 33, GRPS antennal interface 37.Described flush bonding processor 31, system bus 38, system storage 36, GPS receiving element 35, logic control element 33, GRPS antennal interface 37 are commercial element.On described flush bonding processor 31, be equiped with described RS232 serial ports 30 and described expansion serial ports RS232 32; Described flush bonding processor 31 is connected with the RS232 communication serial ports 26 of described thunderbolt information acquisition unit with lead through RS232 serial ports 30, in order to realize exchanges data; The expansion serial ports RS232 32 of described flush bonding processor 31 in order to when the system extension and other flush bonding processors realize data communications.Be connected through described system bus 38 between described flush bonding processor 31, described system storage 36, described GPS receiving element 35, described logic control element 33, the described GPRS antennal interface 37, in order to realize the data transmission between each unit interface.In described logic control element 33, be equiped with the multi-functional I/O mouth and the Universal LED display interface 34 of reservation, in order to the status monitoring in the operation debug process.Described GPRS antennal interface 37 is connected with described system bus 38 through lead, in order to realize wireless transmission function.
Described power supply unit 7 comprises power-supply controller of electric 5, solar panel 6, accumulator 4, power module 3.Described power-supply controller of electric 5 and solar panel 6 and accumulator 4 and power module 3 are commercial element.Described power-supply controller of electric 5, described accumulator 4, described power module 3 are installed in the rainproof case at overhead transmission line line pole tower middle part; Said solar panel 6 is installed on the same shaft tower of described rainproof case.Described power-supply controller of electric 5 is connected with described solar panel 6, described accumulator 4, described power module 3 respectively through power lead respectively; In order under the regulating action of institute's lectotype intelligently to described accumulator 4, described solar panel 6 adjustment duties to realize to said power module 3 uninterrupted power supplies; Can guarantee the power supply reliably and with long-term of on-line monitoring system, ensure system of the present invention operate as normal for a long time.The output terminal of described solar panel 6 is connected with described power-supply controller of electric 5 input ends through power lead, in order to delivering to said power-supply controller of electric 5 from the direct current that sunlight transforms; Described solar panel 6 power are 50W.Described accumulator 4 is connected with said power-supply controller of electric 5 through lead, in order to store and supply of electrical energy; Described accumulator 4 capacity are 45AH.Said power module 3 input ends are connected through the output terminal of power lead with described power-supply controller of electric 5, realize said power module 3 power supplies.The output terminal of said power module 3 is connected with GPRS transmission unit 8 input ends with described lightning strike signals collecting unit 2 and described Data Receiving respectively through lead respectively; The 12V DC voltage is converted into 4 kinds of DC voltages of 5V, 3.3V, 2.5V, 1.8V, for described Data Receiving and GPRS transmission unit 8 and described lightning strike signals collecting unit 2 provide power supply.
Described subscriber unit 12 comprises the Internet 9, user terminal 10, ftp server 11.Described ftp server 11 is placed in the pulpit; Described user terminal 10 is placed in the user and uses indoor.Described the Internet 9 is the far-end public internet, is connected with described ftp server 11 with described user terminal 10 through netting twine, carries out the wireless messages transmission.Described ftp server 11 can in time obtain the lightning current parameter and guarantee from public internet, can have access to this PC from described the Internet 9 for the PC of NetAssist software is housed.Said user terminal 10 is a monitoring system software, and said user terminal is connected with described the Internet 9 through netting twine, from described ftp server 11, extracts the lightning current parameter and carries out longer-term storage and Treatment Analysis through described the Internet 9 at any time.
Current sensor 1 sensitivity is 0.05V/kA; Frequency band is 768Hz ~ 18MHz, and the amplitude of lightning current monitoring range is 1kA ~ 100kA, and the high-speed sampling port number is that 3 passages, sampling rate are that 10M, precision figure place are 11 bipolaritys; Power supply safety is normal, can guarantee its long-term operate as normal.
Embodiment 2
A kind of overhead transmission line lightning current on-line monitoring system that is used for 220kV based on differential ring, with embodiment 1, wherein:
Described current sensor 1 is installed on the overhead transmission line line pole tower cross-arm and perpendicular to three-phase conducting wire 2m place; The number of turn of said differential ring coil 16 is 90 circles; Lower end at the opposite side of described screening can 15 is provided with the manhole that a radius is 6mm (being fairlead); Said junction box's 14 length is 25mm; Described integrating resistor 18 (being that resistance is the noninductive resistance of 0.25 Ω) is installed in the described junction box 14; Current sensor 1 sensitivity is 0.04V/kA, and frequency band is 575Hz ~ 25MHz, and the amplitude of lightning current monitoring range is 1.25kA ~ 100kA, and the high-speed sampling port number is 4 passages.
A kind of overhead transmission line lightning current on-line monitoring system that is used for 500kV based on differential ring, with embodiment 1, wherein:
Described current sensor 1 is installed on the overhead transmission line line pole tower cross-arm and perpendicular to three-phase conducting wire 5m place; The wall thickness of the hollow cylinder housing of described shielding inner casing 17 is 10mm, highly is 200mm for 200mm, hollow internal diameter; The width of chimb is that 10mm, thickness are 10mm outside the upper end of said shielding inner casing 17; The width of chimb is 10mm, thickness 14mm outside the bottom of said shielding inner casing 17; Described differential ring coil 16 adopts line directly for the copper core enameled wire of 1.5mm evenly is wound on the outside surface of described shielding inner casing 17, and the number of turn of said differential ring coil 16 is 400 circles, and internal diameter is 205mm; The wall thickness of the hollow cylinder housing of described screening can 15 is 10mm, highly is 186mm; In a side of described screening can 15 and described shielding inner casing 17, also corresponding respectively axis direction is provided with the slit that a width is the perforation of 2mm; Lower end at the opposite side of described screening can 15 is provided with the manhole that a radius is 10mm (being fairlead); Said junction box's 14 length is that 30mm, wall thickness are 5mm; Described integrating resistor 18 (being that resistance is the noninductive resistance of 5 Ω) is installed in the described junction box 14; Described solar panel 6 power are 60W; Described accumulator 4 capacity are 55AH; Current sensor 1 sensitivity is 0.02V/kA, and frequency band is 300Hz ~ 20MHz, and the amplitude of lightning current monitoring range is 2.5kA ~ 100kA, and the high-speed sampling port number is that 4 passages, precision figure place are 10 bipolaritys.
Embodiment 4
A kind of overhead transmission line lightning current on-line monitoring system based on differential ring, with embodiment 1, wherein:
Described current sensor is installed in the test platform lay down location of tested lead 1m; The wall thickness of the hollow cylinder housing of described shielding inner casing 17 is 2mm, highly is 40mm for 40mm, hollow internal diameter; The width of chimb is that 4mm, thickness are 3mm outside the upper end of said shielding inner casing 17; The width of chimb is 2mm, thickness 6mm outside the bottom of said shielding inner casing 17. Described differential ring coil 16 adopts line directly for the copper core enameled wire of 0.5mm evenly is wound on the outside surface of described shielding inner casing 17, and the number of turn of said differential ring coil 16 is 60 circles, and internal diameter is 45mm; The wall thickness of the hollow cylinder housing of described screening can 15 is 2mm, highly is 37mm; Described integrating resistor 18 (being that resistance is the noninductive resistance of 0.1 Ω) is installed in the described junction box 14; Described solar panel 6 power are 40W; Described accumulator 4 capacity are 34AH; Current sensor 1 sensitivity is 0.1V/kA, and frequency band is 768Hz ~ 23MHz, and the amplitude of lightning current monitoring range is 1kA ~ 50kA, and the precision figure place is 12 bipolaritys.
Measured result
The overhead transmission line lightning current on-line monitoring system based on differential ring with present embodiment 1 was installed on certain the 110kV Da Lei of electric company west line before 20 days April in 2012.After the operation, monitor the thunderbolt overhead transmission line three-phase lightning current waveform that flows through the 19# shaft tower 2: 42: 30 morning of on April 24th, 2012, as shown in Figure 6.
Among the figure: first peak time: 12.5
s; Time to peak: 14
s; Amplitude :-5.15kA; The half-peak value time: 18.5
s, the lightning fault pattern is thunderbolt overhead transmission line A phase shielding fault.
Can be known by measured result: the present invention can realize that overhead transmission line lightning current Non-contact and On-line monitoring, current sensor are highly sensitive, the overhead transmission line lightning current monitoring of broadband, wide amplitude of lightning current monitoring range, multi-channel high-speed sampling, sampling with high precision; Power supply safety is normal; Can realize long-term operate as normal; Guaranteed that the direct monitoring that can extensively carry out lightning current obtains lightning current parameter accurately, can effectively solve the difficult problem that the lightning current parameter lacks; The present invention obtains for the identification of lightning fault pattern, the automatic triggering of geography information such as time and longitude and latitude when obtaining the lightning current waveform; Help carrying out fast the lightning current waveform of thunder and lightning location and inverting lightning strike spot and arrange line walking to handle the work of lightning fault point, reduce the thunderbolt economic loss brought by power failure; While reliable operation of the present invention, operative intelligence can effectively satisfy the needs of monitoring system, and is easy to utilize.
Claims (2)
1. overhead transmission line lightning current on-line monitoring system based on differential ring; Comprise current sensor (1), lightning strike signals collecting unit (2), Data Receiving and GPRS transmission unit (8), it is characterized in that described on-line monitoring system also comprises power supply unit (7), subscriber unit (12);
Described current sensor (1) is installed on the overhead transmission line line pole tower cross-arm and perpendicular to three-phase conducting wire 1 ~ 5m place; Described current sensor (1) is differential ring current sensor (1); Comprise extension line (13), junction box (14), screening can (15), shielding inner casing (17), differential ring coil (16), integrating resistor (18), coaxial fitting (19), concentric cable (20); Described shielding inner casing (17), screening can (15) and junction box's (14) material is aluminium; Described shielding inner casing (17) be shaped as upper end and bottom all with the hollow cylinder housing of outer chimb, the wall thickness of the hollow cylinder housing of described shielding inner casing (17) is 2 ~ 10mm, highly is that 40 ~ 200mm, hollow internal diameter are 40 ~ 200mm; The width of chimb is that 4 ~ 10mm, thickness are 3 ~ 10mm outside the upper end of said shielding inner casing (17); The width of chimb is 2 ~ 10mm, thickness 6 ~ 14mm outside the bottom of said shielding inner casing (17); The upper end of chimb is provided with the buckle of indent outside the upper end of described shielding inner casing (17); Described differential ring coil (16) employing line directly is that the copper core enameled wire of 0.5 ~ 1.5mm evenly is wound on the outside surface of described shielding inner casing (17); The number of turn of said differential ring coil (16) is 60 ~ 400 circles; Internal diameter is 45 ~ 205mm, and draw through said extension line (13) at the two ends of described differential ring coil (16), and described screening can (15) is installed in the outside of described differential ring coil (16); Described screening can (15) be shaped as the hollow cylinder housing; The wall thickness of the hollow cylinder housing of described screening can (15) is 2 ~ 10mm, highly is 37 ~ 186mm, and the external diameter of the outer chimb of internal diameter and described shielding inner casing (17) lower end is complementary; Side at described screening can (15) and described shielding inner casing (17); Respectively and corresponding axis direction the slit that one width is the perforation of 1 ~ 2mm is set, be provided with the buckle of protrusion in described screening can (15) upper end, the buckle of described screening can (15) through this protrusion tightens with the indent buckle of the outer chimb lower end of described shielding inner casing (17) upper end and is connected; The lower end of described screening can (15) is affixed through chimb outside the bottom of screw and described shielding inner casing (17); Lower end at the opposite side of described screening can (15) is provided with the manhole that a radius is 5 ~ 10mm, i.e. fairlead, the hollow cylinder housing that described junction box (14) does not seal for two ends; Said junction box's (14) length is that 20 ~ 30mm, wall thickness are that the aperture of the fairlead of 3 ~ 5mm, internal diameter and said screening can (15) lower end is complementary; A described closed end is fixed in the fairlead place of said screening can (15) lower end, described integrating resistor (18), and promptly resistance is that the noninductive resistance of 0.1 ~ 5 Ω is installed in the described junction box (14); Described coaxial fitting (19) is fixed in the outer end of said junction box (14); One end extension line (13) of described differential ring coil (16) is with described integrating resistor (18) one ends and after connecing; Heart yearn with described coaxial fitting (19) is connected again; The other end extension line (13) of described differential ring coil (16) is with described integrating resistor (18) other end and after connecing; Ground wire with described coaxial fitting (19) is connected again, and the other end of described concentric cable (20) is connected with the BNC passage (21) of described lightning strike signals collecting unit (2);
Described lightning strike signals collecting unit (2) is installed in the rainproof case at overhead transmission line line pole tower middle part; Described lightning strike signals collecting unit (2); Comprise that BNC passage (21), signal condition (22), data sampling processing module (23) and FPGA microcontroller (24), bus control unit (29), debugging are with serial ports (25), RS232 communication serial ports (26), storer (27), real-time clock (28); Described BNC passage (21) is connected with described current sensor (1) through 4 concentric cable (20); The input end of described signal condition (22) is connected through 4 leads respectively with the output terminal of BNC passage (21); The output terminal of described signal condition (22) is connected through 4 leads with the input end of described data sampling processing module (23); The input end of described data sampling processing module (23) also is connected with described bus control unit (29) output terminal through lead; The output terminal of described data sampling processing module (23) is connected with the input end of FPGA through lead; The input end of described FPGA microcontroller (24) is connected with the output terminal of described data sampling processing module (23) with said real-time clock (28) respectively through lead respectively; The output terminal of described FPGA microcontroller (24) is connected with described bus control unit (29) input end through lead; The output terminal of described bus control unit (29) is connected through the input end of lead with described data sampling processing module (23), and the output terminal of described FPGA microcontroller (24) is connected with described RS232 communication serial ports (26) and described storer (27) with serial ports (25) with described debugging respectively through lead respectively;
Described Data Receiving and GPRS transmission unit (8) are installed in the rainproof case at overhead transmission line line pole tower middle part; Described Data Receiving and GPRS transmission unit (8); Comprise flush bonding processor (31), system bus (38), system storage (36), GPS receiving element (35), logic control element (33), GRPS antennal interface (37), on described flush bonding processor (31), be equiped with described RS232 serial ports (30) and described expansion serial ports RS232 (32); Described flush bonding processor (31) is connected with the RS232 communication serial ports (26) of described thunderbolt information acquisition unit with lead through RS232 serial ports (30); Be connected through described system bus (38) between described flush bonding processor (31), described system storage (36), described GPS receiving element (35), described logic control element (33), the described GPRS antennal interface (37); In described logic control element (33), be equiped with the multi-functional I/O mouth and the Universal LED display interface (34) of reservation, described GPRS antennal interface (37) is connected with described system bus (38) through lead;
Described power supply unit (7); Comprise power-supply controller of electric (5), solar panel (6), accumulator (4), power module (3), described power-supply controller of electric (5), described accumulator (4), described power module (3) are installed in the rainproof case at overhead transmission line line pole tower middle part; Said solar panel (6) is installed on the same shaft tower of said rainproof case; Described power-supply controller of electric (5) is connected with described solar panel (6), described accumulator (4), described power module (3) respectively through power lead respectively; The output terminal of described solar panel (6) is connected with described power-supply controller of electric (5) input end through power lead; Described accumulator (4) is connected with said power-supply controller of electric (5) through lead; Said power module (3) input end is connected through the output terminal of power lead with described power-supply controller of electric (5); Realization is supplied power to said power module; The output terminal of said power module (3) is connected with GPRS transmission unit (8) input end with described lightning strike signals collecting unit (2) and described Data Receiving respectively through lead respectively, and the 12V DC voltage is converted into 4 kinds of DC voltages of 5V, 3.3V, 2.5V, 1.8V, for described Data Receiving and GPRS transmission unit (8) and described lightning strike signals collecting unit (2) provide power supply;
Described subscriber unit (12) comprises the Internet (9), user terminal (10), ftp server (11), and described ftp server (11) is placed in the pulpit; Described user terminal (10) is placed in the user and uses indoor; Described the Internet (9) is the far-end public internet; Be connected with described ftp server (11) with described user terminal (10) through netting twine; Carry out the wireless messages transmission; Described ftp server (11) can in time obtain the lightning current parameter and guarantee from public internet, can have access to this PC from described the Internet (9) for the PC of NetAssist software is housed, and said user terminal (10) is a monitoring system software; Said user terminal is connected with described the Internet (9) through netting twine, from described ftp server (11), extracts the lightning current parameter and carries out longer-term storage and Treatment Analysis through described the Internet (9) at any time.
2. according to the described overhead transmission line lightning current on-line monitoring system of claim 1, it is characterized in that described solar panel (6) power is 40 ~ 60W based on differential ring; Described accumulator (4) capacity is 34AH ~ 55AH.
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| CN2012102192327A CN102707135A (en) | 2012-06-29 | 2012-06-29 | Lightning current online monitoring system of overhead transmission line based on differential ring |
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| CN2012102192327A CN102707135A (en) | 2012-06-29 | 2012-06-29 | Lightning current online monitoring system of overhead transmission line based on differential ring |
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| CN102928679A (en) * | 2012-11-13 | 2013-02-13 | 贵州电网公司六盘水供电局 | Pole tower lightning monitoring method and lightning monitoring system |
| CN102981089A (en) * | 2012-12-12 | 2013-03-20 | 上海市电力公司 | Micro simulation system for lightning electrical aging of overhead insulated conductors |
| CN103592506A (en) * | 2013-11-30 | 2014-02-19 | 国家电网公司 | On-line monitoring device for lightning current of overhead transmission line |
| CN104076185A (en) * | 2014-07-17 | 2014-10-01 | 重庆大学 | Differential ring lightning current sensor based on printed circuit board and digital integration |
| CN104483604A (en) * | 2014-12-11 | 2015-04-01 | 南京信息工程大学 | Signal circuit lightning stroke monitor |
| CN107907735A (en) * | 2017-10-26 | 2018-04-13 | 国网宁夏电力公司检修公司 | Self-energizing current measurement and analytical equipment |
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