CN101937015A - Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line - Google Patents
Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line Download PDFInfo
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- CN101937015A CN101937015A CN 201010265316 CN201010265316A CN101937015A CN 101937015 A CN101937015 A CN 101937015A CN 201010265316 CN201010265316 CN 201010265316 CN 201010265316 A CN201010265316 A CN 201010265316A CN 101937015 A CN101937015 A CN 101937015A
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Abstract
The invention discloses a device for online monitoring lightning current and lightning voltage waveform parameters of an overhead transmission line, relating to the fields of lightning information measurement and lightening prevention design. The monitoring system is directly installed on a sub-wire of a single-phase wire or a split wire of the overhead transmission line, a voltage sensor and a current sensor respectively monitor a lightning current signal and a lightning voltage signal, and the two paths of signals are sent to a GPRS (General Packet Radio Service) network by a GPRS module through a signal acquisition and processing module. When the system runs normally, the induced voltage of a check coil is processed and then directly supplies power to the signal acquisition and processing module and the GPRS module and fully charges a lithium ion storage battery; and when the wire has the lightning current and the system is power failure, the lithium ion storage battery supplies power for converting an instant power failure protective capacitor to prevent data loss. The invention provides original data for lightning positioning of the transmission line and the lightning current and lightning voltage waveform parameters of a back calculation lightning stroke point and has the advantages of simple manufacturing process, small size and convenient installation.
Description
Technical field
The present invention relates to the lightning information fields of measurement, particularly the on-line monitoring of overhead transmission line lightning current and lightning voltage waveform parameter.
Background technology
Remain the main factor that influences safe operation of power system at China's damage to crops caused by thunder, the high-tension line tripping operation that thunderbolt causes the line is busy the road always trips about 70% of number of times.Therefore, the understanding of the monitoring of lightning parameter and thunder and lightning physical process has very important actual application value to electric power, lightning Protection Design such as communicate by letter.The method of monitoring lightning current parameter mainly contains following several at present:
1) magnetic link method: be the classic method of measuring lightning current, but the magnetic link method has a great defective, when running into lightning exactly twice opposite polarity launch aing surprise attack being arranged, they are cancelled out each other to the effect of magnet steel, thus the remanent magnetism of magnetic link method can not express launch a surprise attack for twice in any conducting lightning currents peak value once.And the magnetic link measurement sensitivity is low, and measuring error is bigger, and error often reaches 10%～30%.
2) lightning location system (LLS): the mid-1970s, along with the development of microelectric technique and the research of Fields of Lightning Return Stroke field theory obtain gratifying achievement, the thunder and lightning telemetry is developed rapidly.Pinpoint lightning location system (LLS) by people such as U.S. M.A.Uman, EP.Krider development successfully is applied to Kennedy's aerospace center, and applies all over the world gradually subsequently.Can position also thunder and lightning and can write down lightning parameter, but cost also is very high.Rose in 1992, space center of the Chinese Academy of Sciences begins the new time difference system of GPS is studied, successfully developed " ADTD lightning monitoring positioning system ", and in 2000 in the Shenzhen, ground such as Fujian Province, Jiangxi Province, Hunan Province and Qinghai Province does bench-scale testing, achieve complete success.In use also found some problems, very big and be unfavorable for popularizing as equipment complexity, front-end investment, there is certain error in positioning system itself and surveys the dead band, and orographic factor is very big to the interference of acquisition station, and computational data has error etc.
3) magnetic tape method: doctor Crouch of the U.S. adopts highly sensitive recording tape to determine the method for tested lightning current amplitude size, domestic professor Zhang Yuanfang waits and has developed magnetic tape type lightning current registering instrument in view of the above, but the amplitude of the just lightning current that this method measures is far from being enough for the mechanism and the influence factor thereof of comprehensive research transmission line of lightning strike.
Summary of the invention
The invention provides a kind of overhead transmission line lightning current and lightning voltage waveform parameter on-Line Monitor Device, can be used for directly monitoring the lightning current on the transmission line of electricity and the waveform parameter of lightning voltage, for the lightning current and the lightning voltage waveform parameter of the thunder and lightning on transmission line of electricity location and Inversion Calculation lightning strike spot provides raw data, therefore significant to the statistics and the lightning Protection Design of lightning information.
Technical scheme of the present invention is achieved in that
The power taking coil is connected to voltage conditioning and energy-storage module, and voltage conditioning and energy-storage module are connected respectively to signals collecting and processing module and GPRS module again; Voltage sensor and current sensor are connected respectively to signals collecting and processing module; Signals collecting and processing module are connected to the GPRS module, and the antenna of GPRS module is installed in the voltage sensor outside.
Voltage sensor comprises top electrode, pi film and bottom electrode, and bottom electrode is fixed on the top electrode downside, sandwiches the pi film between two electrodes.
Voltage conditioning and energy-storage module comprise protection current rectifying and wave filtering circuit, DC/DC transducer, power down protection electric capacity and lithium-ions battery, and the protection current rectifying and wave filtering circuit connects the DC/DC transducer, and the DC/DC transducer connects power down protection electric capacity and lithium-ions battery respectively.
The present invention is installed on the lead of overhead transmission line or on the sub-conductor of split conductor, gather lightning current and lightning voltage signal on this lead respectively by jaw formula rogowski coil current sensor and capacitance coupling type voltage sensor, with the two-way concentric cable lightning current and lightning voltage two paths of signals are inputed to signals collecting and processing module, deliver to the GPRS module through serial ports then, finally send to GPRS network.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 lithium-ions battery power supply combines.When system normally moves, directly power by power down protection electric capacity behind the induced voltage of the power taking coil process rectifying and wave-filtering voltage transformation, and be full of to lithium-ions battery; When on the lead lightning current being arranged or during system cut-off, switch to rapidly by the lithium-ions battery power supply, conversion instant power-down protection electric capacity prevents the instant power-down loss of data.
Description of drawings
Fig. 1 installation of the present invention and structural representation;
Fig. 2 jaw formula rogowski coil shell mechanism synoptic diagram;
The signals collecting of Fig. 3 FPGA control and processing block diagram;
The online electric power system synoptic diagram of Fig. 4;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
With reference to shown in Figure 1, voltage sensor 1 about two halves shell pincers hang on the lead of overhead transmission line or on the sub-conductor of split conductor, an end contact with the tight holding electrical of lead, forms equipotential, the other end is by the isolation of also insulating of insulating part 4 and lead fixed.Voltage sensor 1 is the capacitance coupling type voltage sensor, meets the capacitive divider principle.Voltage sensor 1 adopts aluminium, comprises top electrode 8, pi film 9 and bottom electrode 10, and bottom electrode 10 is fixed on top electrode 8 downsides by insulation screw 11, sandwiches pi film 9 between two electrodes, constitutes high-voltage arm electric capacity; Stray capacitance around bottom electrode 10 and the earth reach between the grounding body constitutes low-voltage arm electric capacity.Flanged (FLGD) BNC 12 usefulness screws are fixed on top electrode 8 upsides, bottom electrode 10 are connected with flanged (FLGD) BNC 12 cores with short lead with screw.Connect flanged (FLGD) BNC 12 and signals collecting and processing module 5 with concentric cable, with the terminal voltage of high-voltage arm electric capacity as sampled input signal.Top electrode 8 has the effect of total system electromagnetic screen concurrently.
With reference to shown in Figure 2, current sensor 2 adopts from integration jaw formula rogowski coil, uses electromagnetic induction principle, the lightning current of high amplitude is transformed into the voltage signal of low amplitude value.Two symmetries, the half shell seam crossing of external shield aluminum hull 13 is hinges 14, and by the padlock 17 formation closed loops of opening part, the inboard is a saddle insulation clasp 15, can avoid external shield aluminum hull 13 to form the circulation offset magnetic fields.Coil adopts the polyamide skeleton in rectangle cross section, admittedly be enclosed in two symmetry half shells of external shield aluminum hull 13 by glass cement respectively after twining the polyester enamelling cuprum round line on two semi-circular skeletons, utilize 13 butt joints of external shield aluminum hull to be combined to a symmetrical annulus, signal is drawn by BNC 16.Skeleton size external diameter 18cm, internal diameter 12cm, thickness 3cm, enamel covered wire line footpath 0.8mm, totally 6700 circles, sampling resistor is 0.5 Ω.Sensitivity is 0.17V/kA, and bandwidth is 100Hz～5MHz, can measure amplitude of lightning current 5kA～200kA.
With reference to Fig. 3, the lightning current of voltage sensor 1 and current sensor 2 outputs and lightning voltage signal two paths of signals are sent into 7 transmission of GPRS module through serial ports then and are sent respectively by concentric cable process signals collecting and processing module 6.The core of signals collecting and processing module 6 is voltage follower 18, differential amplifier 19, A/D converter 20, FPGA 21.FPGA 21 is inner by programmed settings RAM 22, digital comparator 23, phaselocked loop 24, FIFO 25,26 5 functional units of serial ports transmitter module, wherein phaselocked loop 24 provides the differential signal of 25MHz for system, A/D converter 20 output datas store among the RAM 22, and high four figures is according to input digit comparer 23, when data greater than digital comparator in during the preset trigger level, trigger RAM 22 and FIFO 25 passages, data deposit among the FIFO 25, and are input to 7 emissions of GPRS module by serial ports transmitter module 26.
With reference to shown in Figure 4, online electric power system comprises power taking coil 27 and voltage conditioning and energy-storage module 5.Power taking coil 27 is a jaw formula rogowski coil, and external shield shell structure figure is with reference to Fig. 2.The induced voltage of power taking coil output is connected to protection current rectifying and wave filtering circuit 28 by concentric cable; the induction alternating voltage becomes DC voltage, is connected respectively to power down protection electric capacity 30 and lithium-ions battery 31 through DC voltage after 29 conversion of DC/DC transducer again.When system normally moves, directly give signals collecting and processing module 6 and 7 power supplies of GPRS module by power down protection electric capacity 30, and be full of for lithium-ions battery 31; When on the lead lightning current being arranged, protection current rectifying and wave filtering circuit 28 converts voltage conditioning and energy-storage module 5 short circuits to lithium-ions battery 31 power supplies, and conversion instant power-down protection electric capacity 30 prevents the instant power-down loss of data; When circuit cuts off the power supply, also convert lithium-ions battery 31 power supplies to, conversion instant power-down protection electric capacity 30 prevents the instant power-down loss of data.
Voltage sensor about in the of 1 two halves shell pincers hang on the lead of overhead transmission line or on the sub-conductor of split conductor, an end contact with the tight holding electrical of lead, forms equipotential, the other end is by insulating part 4 and the lead fixed and the isolation of insulating.Monitor lightning current and lightning voltage signal on the transmission line of electricity respectively by voltage sensor 1 and current sensor 2, two paths of signals sends to GPRS network by GPRS module 7 after handling through signals collecting and processing module 6.When system normally moved, the induced voltage of power taking coil 27 was directly given signals collecting and processing module 6 and 7 power supplies of GPRS module by power down protection electric capacity 30 behind overprotection rectifying and wave-filtering and voltage transformation, and is full of for lithium-ions battery 31; When on the lead lightning current being arranged or during system cut-off, switch by lithium-ions battery 31 power supplies, conversion instant power-down protection electric capacity 30 prevents the instant power-down loss of data.
Claims (3)
1. overhead transmission line lightning current and lightning voltage waveform parameter on-Line Monitor Device, it comprises: voltage sensor (1), current sensor (2), power taking coil (3), voltage conditioning and energy-storage module (5), signals collecting and processing module (6), GPRS module (7), it is characterized in that: power taking coil (3) is connected to voltage conditioning and energy-storage module (5), and voltage conditioning and energy-storage module (5) are connected respectively to signals collecting and processing module (6) and GPRS module (7) again; Voltage sensor (1) and current sensor (2) are connected respectively to signals collecting and processing module (6); Signals collecting and processing module (6) are connected to GPRS module (7), and the antenna of GPRS module (7) is installed in voltage sensor (1) outside.
2. according to claims 1 described a kind of overhead transmission line lightning current and lightning voltage waveform parameter on-Line Monitor Device, it is characterized in that: voltage sensor (1) comprises top electrode (8), pi film (9) and bottom electrode (10), bottom electrode (10) is fixed on top electrode (8) downside, sandwiches pi film (9) between two electrodes.
3. according to claims 1 described a kind of overhead transmission line lightning current and lightning voltage waveform parameter on-Line Monitor Device; it is characterized in that: voltage conditioning and energy-storage module (5) comprise protection current rectifying and wave filtering circuit (28), DC/DC transducer (29), power down protection electric capacity (30) and lithium-ions battery (31); protection current rectifying and wave filtering circuit (28) connects DC/DC transducer (29), and DC/DC transducer (29) connects power down protection electric capacity (30) and lithium-ions battery (31) respectively.
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| CN 201010265316 CN101937015A (en) | 2010-08-27 | 2010-08-27 | Device for online monitoring lightning current and lightning voltage waveform parameters of overhead transmission line |
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