CN102012451B - Light-emitting diode-based insulator leakage current fiber sensor system - Google Patents
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Abstract
The invention discloses a light-emitting diode-based (LED-based) insulator leakage current fiber sensor system, and belongs to the technical field of flash pollution online monitoring of electric equipment. The system comprises a fixed bracket, a sensor probe, a fiber, a photoelectric converter, a signal modulator, a data acquisition card, a computer and the like. The system is characterized in that: the sensor probe transmits light signals by using leakage current as luminous drive of an LED, then the light signals are transmitted to the photoelectric converter through the fiber and converted into electrical signals, and the electrical signals are transmitted to the computer for analysis through the signal modulator and the data acquisition card in turn. The system can selectively monitor different half waves of leakage current independently in real time, has the characteristics of strong anti-interference capability, high sensitivity, high precision of measured leakage current and good safety, and is convenient to assemble and disassemble and convenient for popularization and application. The system can be widely applied to high-voltage alternating current power transmission lines of transformer substations and overhead power transmission lines which are newly built and put into operation.
Description
Technical field
The invention belongs to electrical equipment pollution flashover on-line monitoring technique field, be specifically related to the leakage current of insulator chain in transformer station and the overhead transmission line and the optical fiber leakage current sensor device of pollution flashover on-line monitoring.
Background technology
For a long time, the pollution flashover accident of insulator chain all is one of disaster of harm power system transmission line safety.The major measure of control insulator chain pollution flashover is exactly the leakage current on the monitoring electric transmission line isolator string; According to being closely connected between the leakage current of insulator chain and the pollution flashover process; Further grasp the mechanism of pollution flashover, this early warning to pollution flashover has extremely important realistic meaning.The widespread use of on-line monitoring technique plays crucial effects to the insulator chain control pollution flashover of electric system, and leakage current measurement device is the main means of research leakage current in the on-line monitoring technique.Because sensor is the pioneer soldier of leakage current monitor system; The degree of accuracy of sensor-based system, promptness, stability and real-time all are the key factors that influences the measuring system accuracy; Thereby; Increasing advanced technology is applied in the sensor-based system, in order to the performance of further raising sensor-based system, thereby gives security for the safe operation of electric system better.
Optical communication is 21 century one of the greatest achievement that obtains of science and technology field, and the widespread use of optical communication has promoted the rise and the development of optical sensor.Maturation gradually along with laser technology; The light detection technology has obtained development at full speed as noncontact, high-speed, high-precision monitoring means; The various attributes that utilize light are like: interference, diffraction, polarization, reflection, absorption and luminous etc.; Optical fiber sensing technology not only is widely used in urban construction, civil engineering work, environmental monitoring, biomedicine and field of aerospace, and a kind of new monitoring means is provided for safe operation of power system.Fiber optic sensor technology is being brought into play enormous function with its unique advantage in every field.Especially it can use under mal-conditions such as strong electromagnetic, HTHP, atomic radiation, explosive, chemical corrosion, so optical fiber sensing technology also begins in electric system, to show up prominently.
Existing optical fibre current sensor system; As on January 21st, 2009 disclosed publication number be " fibre optic current sensor " patent of CN 101351714A; Comprise light source, depolariser, polarising beam splitter, birefringence modulator, Faraday rotator, polarization maintaining optical fibre, two quarter-wave plates; Sensor fibre and detector etc., its sensor fiber is centered around on the monitored current carrying conductor, is based on Faraday magnetooptical effect and the current sensor system that is developed into.The major defect of this current sensor system is: frequency response is poor; Electromagnetism antijamming capability extreme difference, the influence of magnetic field around very easily receiving, the also trickleer bad resolution of phase change; Precision requirement to monitoring instrument is very high, and these have all caused its monitoring accuracy not high.
Summary of the invention
The objective of the invention is deficiency, a kind of insulator leakage current fiber optic sensor system based on light emitting diode is provided, be used to measure the leakage current on the ac high-voltage overhead transmission line defilement and insulation substring to existing optical fibre current sensor system; This system has easy for installation; Sensing sensitivity is high, and the linearity is good, and especially anti-electromagnetic interference capability is strong; Can optionally measure the positive wave or the half-wave of leakage current; Characteristics such as the precision of monitoring leakage electric current is high, and the real time execution reliability is high, and is practical.
The technical scheme that realizes the object of the invention is: a kind of insulator leakage current fiber optic sensor system based on light emitting diode mainly comprises fixed support, sensor probe, optical fiber, photoelectric commutator, signal modulator, data collecting card and computing machine etc.
Described fixed support is by two opening annulus and the pincerlike support of opening that probe bracket constitutes.The material of described two opening annulus is a brass, and each opening annulus is formed by two semicircular ring interlocks.The internal diameter of described each opening annulus is that 75mm～82mm, external diameter are that 85mm～92mm, thickness are 10mm～15mm; Two opening annulus are clamped in respectively on the steel cap of adjacent insulator of tested insulator chain on the overhead transmission line shaft tower, cross the leakage current of insulator chain in order to monitoring stream.Semicircular ring opening part and centre at described each opening annulus are provided with screw respectively, the opening annulus are fixedly connected on the steel cap of adjacent insulator of monitored insulator string through bolt and screw respectively.Each semicircular ring opening part with first bolt and screw with two semicircular ring interlock lassos on the steel cap; In the centre of two semicircular ring respectively through screw and screw with two semicircular ring be held contacting of insulator steel cap, and make the installation and removal of opening annulus very convenient.Screw is set respectively on the closed end of each opening annulus, two semicircular ring is connected into the shape of remaining silent, and regulate the aperture of opening annulus with second bolt.The trailing arm that described probe bracket is 147mm～152mm by two length transverse arm that is 280mm～290mm and length constitutes; Its material is an organic glass; Two transverse arms and a trailing arm are hollow legn; The xsect of every hollow legn is the rectangle of long 24mm～26mm, wide 20mm～22mm, and hollow cross section is the circle of diameter 5.5mm～6.5mm in the hollow legn.Two ends at every hollow legn are provided with screw; One end of two hollow transverse arms is through second bolt; Affixed with the closed end of described two perforate annulus respectively; The other end of two hollow transverse arms is affixed through the two ends of screw and the 3rd bolt and trailing arm respectively, and guarantees the hollow hollow passageway that can form perforation of described transverse arm and trailing arm, in order to place the cable of guiding leakage current.Outer middle side part at described trailing arm is connected with sensor probe through screw.One end of described two cables is connected with the closed end of aforesaid copper opening annulus respectively; The other end of every cable passes the lateral wall at hollow trailing arm middle part respectively; Link to each other with LED (the LED=Light Emitting Diode) two ends of sensor probe respectively, in order to monitor the leakage current in the tested insulator chain.
Described sensor probe is made up of shell, LED and protection diode D (D=Diode).The material of described shell is a stainless steel metal, and profile is a rectangular parallelepiped, and length is that 30mm～34mm, width are 24mm～26mm, highly are 1.5mm～2.5mm for 22mm～24mm, wall thickness.Avris is connected with the engaging lug of band screw respectively up and down in the bottom surface of described shell, described sensor probe is fixed on the middle part lateral surface of trailing arm of described probe bracket through screw and engaging lug respectively.Installing a layer thickness uniformly at the outside surface of described shell is the epoxy resin of 0.1mm～1mm, in order to play an insulation and a waterproof action, guarantees the safety of sensor probe.Described enclosure is equiped with the LED and protection diode D of reverse parallel connection; Two parallel connection points through draw with insulated conductor housing and respectively with described hollow passageway in an end of two cables be connected; LED is converted into light signal with the leakage current signal of tested insulator chain; Protection diode D flows through the current amplitude of LED light emitting diode in order to restriction, and LED is shielded.In the end face outside of said shell, be equiped with and pass the fiber coupler that the shell peace links to each other with optical fiber, fiber coupler is coupled into optical fiber with the light signal that the LED in the sensor probe sends.The other end of optical fiber is connected with the input end of photoelectric commutator through fiber coupler, in order to optical signal transmission that LED is sent in photoelectric commutator.
Described photoelectricity dress converter mainly is made up of housing, photodetector and power supply.Described housing is a stainless steel rectangle housing, and its length is that 39mm～40mm, width are 24mm～26mm, highly are 1.5mm～2.5mm for 20mm～22mm, wall thickness.Described photodetector is commercial high-performance optical electric explorer, and its overall response degree is 200kV/W, and 1M Ω load (AC or DC) is selected in output for use, and maximum is output as 8V.Described photodetector is installed in the described housing; The power end of photodetector is connected with direct current 12V power supply through the cable splice that is arranged on said housing upper wall; The input end of photodetector is connected with optical fiber through the fiber coupler that is fixed on said housing left side wall; Be used to receive the light signal that sends by sensor probe that comes from Optical Fiber Transmission; After the light signal that described photodetector will be come by Optical Fiber Transmission converts electric signal into; Signal cable interface through being fixed in the right wall of said housing transmits the inlet signal cable with signal, and then passes through the input end that signal cable connects signal modulator, handles thereby electric signal is transferred to signal modulator.
Described signal modulator is made up of normal signal amplifying circuit and filtering circuit.Its input end is connected with described photoelectric commutator through signal cable, and its output terminal is through cable and data acquisition card connection.Signal modulator will pass through the electric signal that photoelectric commutator is transformed and amplify and filtering, be transferred to data collecting card then.
Described data collecting card is commercial element.Capture card is American National instrument (NI) X of a company limited series data collecting device, and its single channel sampling rate is 1.25MS/s, and sampling rate is 1MS/s during hyperchannel work; 16 tunnel analog inputs, 16 bit resolutions, simulation is output as 2 the tunnel; Article 24, digital I/O line (wherein 8 is regularly line of 10MHz hardware); The D/O maximum clock frequency reaches 10MHz, adopts the USB serial line interface, supports Windows 7/Vista/XP/2000 operating system.Described data collecting card will carry out the D/A conversion from the electric signal that signal modulator transmission comes, and be delivered to computing machine through USB port and handle.
Described computing machine is commercial desktop computer, saves as 4GB DDR3 in the computing machine, and processor is the Duo Processor i5-460M of Intel; Adopt Windows 7 operating systems; Hard disk is 500GB, and jumbo hard disk and high-end internal memory are enough to guarantee the storage and the analytical work of the competent data of computing machine.Described computing machine links to each other with described capture card through USB interface; To carry and the data of coming are stored and analyzed and show from data collecting card, so that the staff can also be through the situation of change of the leakage current on the human-computer interaction interface Real Time Observation insulator chain of computing machine.
Method of application of the present invention is: at first respectively first bolt of the openend of support bracket fastened opening annulus is taken off during installation; And withdraw from the screw at the semicircular ring middle part of two opening annulus; Regulate the openings of sizes of opening annulus; Its chuck after on two steel caps of tested insulator chain adjacent insulation, is installed into first bolt screw of open front and tightens.Secondly respectively the screw in the middle part of the semicircular ring is screwed into, guarantees that the tip of screw contacts closely with the steel cap of insulator.Then two ports of optical fiber are connected with the photoelectrical coupler of sensor probe output terminal with the photoelectric commutator input end respectively, to accomplish the connection of light path.Rationally profile fiber as far as possible away from transmission pressure, and avoids optical fiber acutely to bend, and makes it be connected to photoelectric commutator along the overhead transmission line shaft tower.After last light signal was handled through photoelectric commutator, the electric signal that will from photoelectric commutator, be transmitted by signal cable was sent to signal modulator and capture card successively, until computing machine.During dismounting, it is removable for loose mail only needing to remove from each interface, also is convenient for changing individual parts wherein.
The amplitude of detection leakage current that the present invention is based on the insulator leakage current fiber optic sensor system of light emitting diode is that 0.1mA～100mA, frequency are that 5Hz～10kHz, sensitivity are 39.8mV/mA～40.2mV/mA.
The present invention adopts mainly has following effect after the above-mentioned technical scheme:
The pincerlike lasso that 1 fixed support of the present invention is used to gather leakage current is an opening annulus made of copper, the steel cap of extracting insulator that can be stable.All be provided with bolt at support bracket fastened two opening annulus front ends; Make things convenient for when dismounting each opening annulus open and close; Two semicircular ring rear ends of each annulus are nested on the screw rod; Two opening annulus can rotate around this screw rod, thereby change openings of sizes, are easily installed on the steel cap of various sizes insulator.Respectively there is a screw hole at semicircular ring middle part at each opening annulus, can be pressed on behind the mounting screw on the steel structure body, further guarantees lasso and steel cap and steel pin good electrical contact.Fixed support is all smaller with respect to the size of insulator sizes and other junctions, and the volume of sensor probe is relatively all smaller, is easy to on-the-spot installation and removal, and is easy to utilize.
2 support bracket fastened transverse arms of the present invention and trailing arm part are processed by the organic glass insulating material, and inside center has the hollow passageway of a diameter 5.5mm～6.5mm.Hollow passageway is used to place cable, and this cable will be guided to the sensor probe that is arranged in the middle part from the leakage current that pincerlike lasso is gathered as the lead of drawing of leakage current.Can avoid the intrusion and the interference of peripheral electromagnetic field with the cable transmission current, strengthen the anti-electromagnetic interference capability of sensor greatly.
3 the present invention carry out opto-electronic conversion to the leakage current signal of tested insulator chain; There is unique photoelectricity to isolate advantage than traditional electromagnetic conversion; In the invention with light emitting diode series connection in the order wire circuit of leakage current, make LED luminous, change through the light signal that photoelectric commutator transmits in optical fiber then through Optical Fiber Transmission; Thereby the physical quantity that realizes light intensity and voltage changes, and is convenient for measuring the correspondent voltage value.Avoid the process that electromagnetism transforms in the EM coupling sensing in the traditional sensors so greatly, thereby improved the sensitivity and the accuracy of monitoring.
4 the present invention use the passage of optical fiber as transmission signals, and the optimal transmission light wave of the multimode optical fiber described in the invention is corresponding with the emission wavelength of LED light emitting diode in the said probe, reach with this and in optical fiber, carry the minimum purpose of signal attenuation.Compare with the traditional cable transmission signals, the high-fidelity performance of optical fiber is even better.The high anti-interfering performance of optical fiber has avoided light signal to receive the electromagnetic interference (EMI) of surrounding environment in transmission course greatly; And the mode that adopts the photoelectricity coupling is isolated and is made and circuit operation high-pressure side and the long separating distance of Monitoring and Controlling low pressure end have greatly improved the security that the operational management personnel work.
5 photoelectric commutators of the present invention are photoelectric conversion devices of especial manufacture; Susceptibility to light intensity is fabulous; The overall response degree reaches 200kV/W; Can measure the minute leakage electric current of microampere order, guaranteeing has response at a high speed to the leakage current on the line insulator string, thereby has further improved monitoring accuracy and sensitivity.
6 in sensor probe of the present invention; Be used to measure the LED working sensitivity height of leakage current, the life-span is long, has ring flange; Installing and replacing is convenient; And the LED two ends are parallel with protection diode D, and its conducting direction and LED are opposite, and protection diode D not only is used for the conducting electric current opposite with the LED conducting direction; And can limit and have excessive electric current to pass through on the LED conducting direction, so the present invention can optionally independently monitor the different half-waves of leakage current.
7 the present invention are highly sensitive to the collection of leakage current, can accurately measure the leakage current waveform that is superimposed with big amplitude pulse, and the sensing range of sensor is 0.1mA～100mA, and frequency range is 5Hz～10kHz, and sensitivity is about 40mV/mA.
The present invention can be widely used in the high-voltage AC transmission circuit of newly-built and transformer station that put into operation and overhead transmission line.
Description of drawings
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is the support bracket fastened structural drawing of facing of the present invention;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the internal circuit schematic diagram of sensor probe of the present invention;
Among the figure: I
LBe the leakage current on the insulator chain, I
aFor flowing through the electric current of LED, I
bFor flowing through the electric current of protection diode.
Fig. 5 is the installation diagram on the spot of sensor probe in the present embodiment 1;
Fig. 6 is present embodiment 1 a sinusoidal current test response oscillogram;
Among the figure: curve a is that function generator is added in the sinusoidal current signal that produces on the resistance, as contrast, and frequency 50HZ, the voltage signal that curve b records for the present invention.
Fig. 7 is present embodiment 1 a square wave pulsed current test response oscillogram;
Among the figure: curve a is that function generator is added in the square wave current signal that produces on the resistance, as contrast, and frequency 50HZ, the voltage signal that curve b records for the present invention.
Fig. 8 is present embodiment 1 a pulse current test response oscillogram;
Among the figure: curve a is that function generator is added in the pulsed current signal that produces on the resistance, as contrast, and frequency 50HZ, the voltage signal that curve b records for the present invention.
Fig. 9 is a leakage current oscillogram under the slight filthy situation of insulator chain of present embodiment 1 actual measurement;
Among the figure: curve a is the current waveform through sampling resistor, and the waveform voltage signal that curve b records for the present invention, working voltage are 10kV.
Figure 10 is a leakage current oscillogram under the filthy situation of the insulator chain moderate of present embodiment 1 actual measurement;
Among the figure: curve a is the current waveform through sampling resistor, and the waveform voltage signal that curve b records for the present invention, working voltage are 15kV.
Figure 11 is the gamut linearity curve map that present embodiment 1 is measured.
Figure 12 is the linearity curve map that present embodiment 1 is measured the faint leakage current of 0.1mA～0.8mA.
Among the figure: 1 sensor probe, 2 optical fiber, 3 photoelectric commutator power supplys, 4 photoelectric commutators, 5 signal cables, 6 signal modulators; 7 data collecting cards, 8 computing machines, 9 opening annulus, 10 transverse arms, 11 trailing arms, 12 fiber couplers; 13 cable splices, 14 signal cable interfaces, 15 photodetectors, 16 first bolts, 17 screws, 18 second bolts; 19 hollow passageway, 20 the 3rd bolts, 21 engaging lugs, 22 overhead transmission line shaft towers, 23 insulator chains, 24 transmission pressures.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Shown in Fig. 1～4, a kind of insulator leakage current fiber optic sensor system based on light emitting diode mainly comprises fixed support, sensor probe 1, optical fiber 2, photoelectric commutator 4, signal modulator 6, data collecting card 7 and computing machine 8 etc.Described fixed support is by two opening annulus 9 and the pincerlike support of opening that probe bracket constitutes.The material of described two opening annulus 9 is a brass, and each opening annulus 9 is formed by two semicircular ring interlocks.The internal diameter of described each opening annulus 9 is that 80mm, external diameter are that 90mm, thickness are 10mm; Two opening annulus 9 are clamped in respectively on the steel cap of adjacent insulator of tested insulator chain 23 on the overhead transmission line shaft tower 22, cross the leakage current of insulator chain 23 in order to monitoring stream.Semicircular ring opening part and centre at described each opening annulus 9 are provided with screw respectively, opening annulus 9 are fixedly connected on the steel cap of adjacent insulator of monitored insulator chain through bolt and screw respectively.Each semicircular ring opening part with first bolt 16 and screw with two semicircular ring interlock lassos on the steel cap; In the centre of two semicircular ring respectively through screw 17 and screw with two semicircular ring be held contacting of insulator steel cap, and make the installation and removal of opening annulus 9 very convenient.Screw is set respectively on the closed end of each opening annulus 9, two semicircular ring is connected into the shape of remaining silent, and regulate the aperture of opening annulus 9 with second bolt.The trailing arm 11 that described probe bracket is 150mm by two length transverse arm 10 that is 285mm and length constitutes; Its material is an organic glass; Two transverse arms 10 and a trailing arm 11 are hollow legn; The xsect of every hollow legn is the rectangle of long 25mm, wide 21mm, and hollow cross section is the circle of diameter 6mm in the hollow legn.Two ends at every hollow legn are provided with screw; One end of two hollow transverse arms is through second bolt 18; Affixed with the closed end of described two perforate annulus 9 respectively; The other end of two hollow transverse arms 10 is affixed with the two ends of trailing arm 11 through screw and the 3rd bolt 20 respectively, and guarantees the hollow hollow passageway 19 that can form perforation of described transverse arm 10 and trailing arm 11, in order to place the cable of guiding leakage current.Outer middle side part at described trailing arm 11 is connected with sensor probe 1 through screw.One end of described two cables is connected with the closed end of aforesaid copper opening annulus 9 respectively; The other end of every cable passes the lateral wall at hollow trailing arm 11 middle parts respectively; Link to each other with LED (the LED=Light Emitting Diode) two ends of sensor probe 1 respectively, in order to monitor the leakage current in the tested insulator chain 23.
Described sensor probe 1 is made up of shell, LED and protection diode D (D=Diode).The material of described shell is a stainless steel metal, and profile is a rectangular parallelepiped, and length is that 30mm, width are 25mm, highly are 2mm for 23mm, wall thickness.Avris is connected with the engaging lug 21 of band screw respectively up and down in the bottom surface of described shell, described sensor probe 1 is fixed on the middle part lateral surface of trailing arm 11 of described probe bracket through screw and engaging lug 21 respectively.Installing a layer thickness uniformly at the outside surface of described shell is the epoxy resin of 0.5mm, in order to play an insulation and a waterproof action, guarantees the safety of sensor probe 1.Described enclosure is equiped with the LED and protection diode D of reverse parallel connection; Two parallel connection points through draw with insulated conductor housing and respectively with described hollow passageway 19 in an end of two cables be connected; LED is converted into light signal with the leakage current signal of tested insulator chain; Protection diode D flows through the current amplitude of LED light emitting diode in order to restriction, and LED is shielded.In the end face outside of said shell, be equiped with and pass the fiber coupler 12 that the shell peace links to each other with optical fiber, the light signal that fiber coupler 12 sends the LED in the sensor probe 1 is coupled into optical fiber 2.The other end of optical fiber 2 is connected with the input end of photoelectric commutator 4 through fiber coupler, in order to optical signal transmission that LED is sent in photoelectric commutator 4.
Described photoelectricity dress converter 4 mainly is made up of housing, photodetector 15 and power supply 3.Described housing is a stainless steel rectangle housing, and its length is that 39.5mm, width are 26mm, highly are 2mm for 22mm, wall thickness.Described photodetector 15 is commercial high-performance optical electric explorer, and its overall response degree is 200kV/W, and 1M Ω load (AC or DC) is selected in output for use, and maximum is output as 8V.Described photodetector 15 is installed in the described housing; The power end of photodetector is connected with direct current 12V power supply through the cable splice 13 that is arranged on said housing upper wall; The input end of photodetector 15 is connected with optical fiber 2 through the fiber coupler that is fixed on said housing left side wall; Be used to receive the light signal that sends by sensor probe 1 that comes from optical fiber 2 transmission; After the light signal that described photodetector 15 will be come by optical fiber 2 transmission converts electric signal into; Signal cable interface 14 through being fixed in the right wall of said housing transmits inlet signal cable 5 with signal, and then passes through the input end that signal cable 5 connects signal modulators 6, handles thereby electric signal is transferred to signal modulator 6.
Described signal modulator 6 is made up of normal signal amplifying circuit and filtering circuit.Its input end is connected with described photoelectric commutator 4 through signal cable 5, and its output terminal is connected with data collecting card 7 through cable.Signal modulator 6 will pass through the electric signal that photoelectric commutator 4 is transformed and amplify and filtering, be transferred to data collecting card 7 then.
Described data collecting card 7 is commercial element.Capture card is American National instrument (NI) X of a company limited series data collecting device, and model is NI USB-6351, and its single channel sampling rate is 1.25MS/s; Sampling rate is 1MS/s during hyperchannel work, 16 tunnel analog inputs, 16 bit resolutions; Simulation is output as 2 tunnel, 24 digital I/O lines (wherein 8 is regularly line of 10MHz hardware), and the D/O maximum clock frequency reaches 10MHz; Adopt the USB serial line interface, support Windows 7/Vista/XP/2000 operating system.Described data collecting card 7 will carry out the D/A conversion from the electric signal that signal modulator 6 transmission comes, and be delivered to computing machine 8 through USB port and handle.
Described computing machine 8 is commercial desktop computer; Save as 4GB DDR3 in the computing machine 8; Processor is the Duo Processor i5-460M of Intel, adopts Windows 7 operating systems, and hard disk is 500GB; Jumbo hard disk and high-end internal memory are enough to guarantee the storage and the analytical work of computing machine 8 competent data.Described computing machine links to each other with described capture card through USB interface; The data that to come from data collecting card 7 conveyings are stored and are analyzed and show, so that the staff can also be through the situation of change of the leakage current on the tested insulator chain 23 of human-computer interaction interface Real Time Observation of computing machine 8.
The amplitude based on the detection leakage current of the insulator leakage current fiber optic sensor system of light emitting diode of present embodiment is that 0.1mA～100mA, frequency are that 5Hz～10kHz, sensitivity are 40.1mV/mA.
A kind of insulator leakage current fiber optic sensor system based on light emitting diode, with embodiment 1, wherein: the internal diameter of two opening annulus 9 is that 82mm, external diameter are that the thickness of 92mm, ring is 13mm; Transverse arm 10 length of probe bracket are 290mm, and trailing arm 11 length are 147mm, and the square-section length of hollow transverse arm 10 and trailing arm 11 is that 26mm, width are 20mm; The diameter of the hollow passageway 19 in hollow transverse arm 10 and the trailing arm 11 is 5.5mm; The long 33mm of the shell of sensor probe 1, wide 26mm, high 22mm, wall thickness are 1.5mm, and the outer field epoxy coating thickness of shell is 0.1mm; The length of the housing of photoelectric commutator 4 is that 39mm, width are 25mm, highly are 1.5mm for 21mm, wall thickness.The sensitivity that detects leakage current is 39.8mV/mA.
A kind of insulator leakage current fiber optic sensor system based on light emitting diode, with embodiment 1, wherein: the internal diameter of two opening annulus 9 is 76mm, and external diameter is 86mm, and the thickness of ring is 15mm; Transverse arm 10 length of probe bracket are 280mm, and trailing arm 11 length are 152mm, and the square-section length of hollow transverse arm 10 and trailing arm 11 is 24mm, and width is 22mm; The diameter of the hollow passageway 19 in hollow transverse arm 10 and the trailing arm 11 is 6.5mm; The long 32mm of the shell of sensor probe 1, wide 24mm, high 24mm, wall thickness are 2.5mm, and the outer field epoxy coating thickness of shell is 1mm; The shell length of photoelectric commutator 4 is that 40mm, width are 24mm, highly are 2.5mm for 20mm, wall thickness.The sensitivity that detects leakage current is 40.2mV/mA.
Test findings
Leakage current sensor to the embodiment of the invention 1 carries out following test:
1, the test of the responsiveness and the linearity.Method of testing is: produce sine, square wave and the monopulse voltage signal of different voltage magnitudes with function, the sampling resistor of known resistance is connected on the voltage signal two ends to produce the current signal of certain amplitude, as the test signal of current sensor system.The end of incoming cables of sensor probe and exit are connected in the circuit; The signal input oscillograph that to from signal modulator, export then; Read magnitude of voltage through oscillograph, the record experimental data also adopts trace-point method to draw out the response curve and the linearity curve of current sensor of the present invention.Like Fig. 6, Fig. 7, Fig. 8, Figure 11 and shown in Figure 12.
2, the test experiments of contaminated insulator leakage current.Test uses the fog chamber to be the organic glass jar, and volumetric parameter is φ 1500 * 2000mm, and testing transformer is YDW-50/50; Rated capacity is 50kVA; Rated output voltage is 50kV, and output-current rating is 1A, satisfies IEC60507 and GB/T4584-2004 to exchanging the requirement of pollution test power supply.Test product is the plate-shaped suspension type insulator, and model is XP-70.Use the equivalent salt density degree to be 0.05mg/mm in the test respectively
2And 0.1mg/mm
2The operating condition of the simulation of filthy degree slight filthy and moderate filth, the test run voltage of insulator chain is 10kV and 15kV.Test result is respectively like Fig. 9 and shown in Figure 10.
Know from above-mentioned test findings: when the present invention measures in actual tests; Like Fig. 6, Fig. 7 and shown in Figure 7, the characteristic of original waveform has all been caught in the measurement of sensing system offset of sinusoidal, square wave and pulse current more accurately, can find out from Fig. 9 and Figure 10; Leakage current to the insulator chain of operation under the power-frequency voltage effect; The present invention also can make sensitivity and reflection accurately, and the linearity on its gamut and small range sees that the present invention can monitor the leakage current in 0.1mA～100mA scope in real time; And the sensitivity of sensor stable maintain 40mV/mA, degree of fitting all reaches more than 99.98%.The present invention can satisfy the requirement of engineering reality to overhead transmission line insulator chain On-line Monitoring of Leakage Current in sum; And has a precision height; Characteristics such as the linearity is good, and is highly sensitive, and antijamming capability is strong; And load and unload very conveniently, can be widely used in the high-voltage AC transmission circuit of newly-built and transformer station that put into operation and overhead transmission line.
Claims (5)
1. the insulator leakage current fiber optic sensor system based on light emitting diode comprises fixed support, sensor probe (1), optical fiber (2), photoelectric commutator (4), signal modulator (6), data collecting card (7) and computing machine (8);
Described fixed support is two opening annulus (9) and the pincerlike support of opening that probe bracket constitutes; The material of described two opening annulus (9) is a brass; Each opening annulus (9) is formed by two semicircular ring interlocks; The internal diameter of described each opening annulus (9) is that 75mm～82mm, external diameter are that 85mm～92mm, thickness are 10mm～15mm, and two opening annulus (9) are clamped in respectively on the steel cap of the adjacent insulator of tested insulator chain (23) on the overhead transmission line shaft tower (22), in the semicircular ring opening part and the centre of described each opening annulus (9) screw are set respectively; Opening annulus (9) is fixedly connected on the steel cap of adjacent insulator of monitored insulator chain (23) through bolt and screw respectively; Two semicircular ring are engaged on the steel cap with first bolt (16) and screw at each semicircular ring opening part, respectively that two semicircular ring are affixed with the insulator steel cap that is held through screw (17) and screw respectively in the centre of two semicircular ring, on the closed end of each opening annulus (9), screw is set respectively; With second bolt two semicircular ring are connected into the shape of remaining silent; And the aperture of regulating opening annulus (9), the transverse arm that described probe bracket is 280mm～290mm by two length (10) and trailing arm (11) formation that length is 147mm～152mm, its material is an organic glass; Two transverse arms (10) and a trailing arm (11) are hollow legn; The xsect of every hollow legn is the rectangle of long 24mm～26mm, wide 20mm～22mm, and hollow cross section is the circle of diameter 5.5mm～6.5mm in the hollow legn, is provided with screw at the two ends of every hollow legn; One end of two hollow transverse arms is through second bolt (18); Affixed with the closed end of described two opening annulus (9) respectively, the other end of two hollow transverse arms (10) is affixed with the two ends of trailing arm (11) through screw and the 3rd bolt (20) respectively, and guarantees the hollow hollow passageway (19) that can form perforation of described transverse arm (10) and trailing arm (11); In order to place the cable of guiding leakage current; At the outer middle side part of described trailing arm (11), be connected with sensor probe (1) through screw, an end of two described cables is connected with the closed end of aforesaid copper opening annulus (9) respectively; The other end of every cable passes the lateral wall at hollow trailing arm (11) middle part respectively, and the LED two ends with sensor probe (1) link to each other respectively;
Described sensor probe (1) is made up of shell, LED and protection diode D; The material of described shell is a stainless steel metal; Profile is a rectangular parallelepiped; Length is that 30mm～34mm, width are 24mm～26mm, highly are 1.5mm～2.5mm for 22mm～24mm, wall thickness; Avris is connected with the engaging lug (21) of band screw respectively about the bottom surface of described shell; Described sensor probe (1) is fixed on the middle part lateral surface of trailing arm (11) of described probe bracket through screw and engaging lug (21) respectively, the outside surface of described shell uniformly installing one layer thickness be the epoxy resin of 0.1mm～1mm, described enclosure is equiped with the LED and protection diode D of reverse parallel connection; Two parallel connection points through draw with insulated conductor housing and respectively with described hollow passageway (19) in an end of two cables be connected; LED is converted into light signal with the leakage current signal of tested insulator chain, and protection diode D flows through the current amplitude of LED in order to restriction, in the end face outside of said shell; Be equiped with and pass the fiber coupler (12) that links to each other with optical fiber (2) behind the shell; The light signal that fiber coupler (12) sends the LED in the sensor probe (1) is coupled into optical fiber (2), and the other end of optical fiber (2) is connected with the input end of photoelectric commutator (4) through fiber coupler, arrives in the photoelectric commutator (4) in order to the optical signal transmission that LED is sent;
Described photoelectric commutator (4); Form by housing, photodetector (15) and photoelectric commutator power supply (3); Described housing is a stainless steel rectangle housing; Its length is that 39mm～40mm, width are 24mm～26mm, highly are 1.5mm～2.5mm for 20mm～22mm, wall thickness; Described photodetector (15) is installed in the described housing; The power end of photodetector (15) is connected with the photoelectric commutator power supply (3) of direct current 12V through the cable splice (13) that is arranged on said housing upper wall, and the input end of photodetector (15) is connected with optical fiber (2) through the fiber coupler that is fixed on said housing left side wall, is used for receiving the light signal that is sent by sensor probe (1) that transmits from optical fiber (2); After the light signal that described photodetector (15) will be come by optical fiber (2) transmission converts electric signal into; Signal cable interface (14) through being fixed in the right wall of said housing transmits inlet signal cable (5) with signal, and then passes through the input end that signal cable (5) connects signal modulator (6), handles thereby electric signal is transferred to signal modulator (6);
The input end of described signal modulator (6) is connected with described photoelectric commutator (4) through signal cable (5); Its output terminal is connected with data collecting card (7) through cable; Signal modulator (6) will pass through the electric signal that photoelectric commutator (4) is transformed and amplify and filtering, be transferred to data collecting card (7) then;
Described data collecting card (7) receives from the next electric signal of signal modulator (6) transmission, and signal is carried out the A/D conversion, passes through USB port again signal conveys to computing machine (8) is handled;
Described computing machine (8) links to each other with data collecting card (7) through USB interface, and the data that will come from data collecting card (7) conveying are stored and analyzed and show.
2. according to the described insulator leakage current fiber optic sensor system based on light emitting diode of claim 1, the amplitude that it is characterized in that detecting leakage current is that 0.1mA～100mA, frequency are that 5Hz～10kHz, sensitivity are 39.8mV/mA～40.2mV/mA.
3. according to the described insulator leakage current fiber optic sensor system based on light emitting diode of claim 1, the internal diameter that it is characterized in that two opening annulus (9) is 80mm, and external diameter is 90mm, and the thickness of ring is 10mm; The transverse arm of probe bracket (10) is long to be 285mm, and trailing arm (11) is long to be 150mm, and the square-section length of hollow transverse arm (10) and trailing arm (11) is that 25mm, width are 21mm; The diameter of the hollow passageway (19) in hollow transverse arm (10) and the trailing arm (11) is 6mm; The long 30mm of shell of sensor probe (1), wide 25mm, high 23mm, wall thickness are 2mm, and the outer field epoxy coating thickness of shell is 0.5mm; The shell length of photoelectric commutator (4) is that 39.5mm, width are 26mm, highly are 2mm for 22mm, wall thickness.
4. according to the described insulator leakage current fiber optic sensor system based on light emitting diode of claim 1, the internal diameter that it is characterized in that two opening annulus (9) is that 82mm, external diameter are that the thickness of 92mm, ring is 13mm; The transverse arm of probe bracket (10) is long for 290mm, trailing arm (11) length are 147mm, and the square-section length of hollow transverse arm (10) and trailing arm (11) is that 26mm, width are 20mm; The diameter of the hollow passageway (19) in hollow transverse arm (10) and the trailing arm (11) is 5.5mm; The long 33mm of shell of sensor probe (1), wide 26mm, high 22mm, wall thickness are 1.5mm, and the outer field epoxy coating thickness of shell is that the shell length of 0.1mm photoelectric commutator (4) is that 39mm, width are 25mm, highly are 1.5mm for 21mm, wall thickness.
5. according to the described insulator leakage current fiber optic sensor system based on light emitting diode of claim 1, the internal diameter that it is characterized in that two opening annulus (9) is that 76mm, external diameter are that the thickness of 86mm, ring is 15mm; The transverse arm of probe bracket (10) is long for 280mm, trailing arm (11) length are 152mm, and the square-section length of hollow transverse arm (10) and trailing arm (11) is that 24mm, width are 22mm; The diameter of the hollow passageway (19) in hollow transverse arm (10) and the trailing arm (11) is 6.5mm; The long 32mm of shell of sensor probe (1), wide 24mm, high 24mm, wall thickness are 2.5mm, and the outer field epoxy coating thickness of shell is that the shell length of 1mm photoelectric commutator (4) is that 40mm, width are 24mm, highly are 2.5mm for 20mm, wall thickness.
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| CN102156214B (en) * | 2011-04-29 | 2013-01-30 | 重庆大学 | Double-light-path leakage current optical fiber sensor device |
| CN102721880A (en) * | 2012-05-30 | 2012-10-10 | 吴江市精工铝字制造厂 | Remote lightning rod monitoring system on basis of LED (Light-Emitting Diode) device |
| CN103033676B (en) * | 2012-12-12 | 2014-03-12 | 中国电力科学研究院 | Extra-high voltage direct current insulator leakage current measuring system |
| CN103743648B (en) * | 2013-12-19 | 2015-11-18 | 西安工程大学 | Based on transmission line of electricity equivalent salt density sensor and the On-line Measuring Method thereof of light wave |
| CN103823165A (en) * | 2014-02-26 | 2014-05-28 | 国家电网公司 | Insulator pollution flashover pre-warning method and system based on leakage currents |
| CN104076260A (en) * | 2014-07-16 | 2014-10-01 | 胡小青 | High-accuracy equipment for detecting pollution flashover of insulator |
| CN105445632A (en) * | 2015-12-23 | 2016-03-30 | 国网山东省电力公司青岛供电公司 | Insulation breakdown detection device and method |
| CN107993429A (en) * | 2017-11-08 | 2018-05-04 | 国家电网公司 | A kind of passive pollution flashover monitoring system |
| CN111322180A (en) * | 2019-12-31 | 2020-06-23 | 广州周锋汽车科技有限公司 | Energy-saving and emission-reducing device and method for internal combustion engine |
| CN116973697B (en) * | 2023-06-20 | 2024-03-26 | 无锡广盈集团有限公司 | Leakage current identification system and method |
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| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
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| CN101126785A (en) * | 2007-08-03 | 2008-02-20 | 重庆大学 | High precision broad frequency contaminated insulator leakage current sensor |
| CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
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