CN206002583U - A kind of lightning arrester discharge current monitoring system - Google Patents

A kind of lightning arrester discharge current monitoring system Download PDF

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Publication number
CN206002583U
CN206002583U CN201620878173.8U CN201620878173U CN206002583U CN 206002583 U CN206002583 U CN 206002583U CN 201620878173 U CN201620878173 U CN 201620878173U CN 206002583 U CN206002583 U CN 206002583U
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China
Prior art keywords
lightning arrester
discharge current
signal
current monitoring
arrester discharge
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CN201620878173.8U
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Inventor
岳石
岳一石
黄福勇
周卫华
王成
王峰
龚政雄
王海跃
彭波
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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Abstract

This utility model provides a kind of lightning arrester discharge current monitoring system, including air core coil, passive integrator, integrated electro-optic manipulator, light source, the first optical fiber, the second optical fiber, photo-detector and harvester.Described air core coil and passive integrator carry out passive measurement to lightning arrester discharge electric current, and the measured signal of telecommunication is converted to optical signal by integrated electro-optic manipulator, and the photo-detector at control room end and harvester are converted to receiving optical signal the signal of telecommunication and are recorded.Solve spark gap end to power the circuit damage problem caused by Ground Electric Potential Rise.Solve signal transmission and be easily disturbed problem, be simultaneously achieved the effective and safe insulation at spark gap end and control room.

Description

A kind of lightning arrester discharge current monitoring system
Technical field
This utility model is related to high pressure equipment performance detection technical field and in particular to a kind of lightning arrester discharge current monitoring System.
Background technology
Lightning stroke trip is the main cause that high voltage power transmisson system produces tripping fault.Spark gap is important as power system Equipment, can be effectively protected power equipment.When being run under normal working voltage by protection equipment, spark gap will not produce Effect, is considered as open circuit for ground.When there is jeopardizing the surge voltage by protection equipment, spark gap action immediately, will High-voltage impact conduct current the earth, limits voltage magnitude, protects insulation of electrical installation, thus effectively limiting lightning surge pair The harm of power equipment, is widely used in power system.Flow through spark gap discharge current generally reach thousand of Pacify to tens kilo-amperes, the accurate measurement of lightning arrester discharge electric current, to leakage conductor running status accurately assessment have important Effect.
Because current spark gap mainly crosses spark gap using the pointer dial plate convection current being installed on leakage conductor bottom Impulsive discharge electric current is counted it is impossible to effectively obtain the key messages such as the amplitude of lightning arrester discharge electric current, waveform, polarity.Existing There is spark gap on-Line Monitor Device only can monitor the leakage current of spark gap it is impossible to realize the measurement of discharge current.Grant number Disclosed in CN102998511 B patent of invention " a kind of lightning arrester discharge current monitoring device ", using wireless data transmission side Formula is carried out data transmission with terminal, is easily affected by high-frequency discharge interference signal in transformer station, makes simultaneously in its transformer station Exchange energy-provision way with 220V, when substation equipment fault causes Ground Electric Potential Rise, be easily damaged monitoring device circuit.Authorize Patent No. CN103197134 B patent of invention is disclosed " a kind of spark gap online data harvester ", equally using no Line data transfer mode exchanges energy-provision way with 220V, faces electromagnetic interference and Ground Electric Potential Rise problem.
Therefore, it is necessary to design a kind of lightning arrester discharge current monitoring system that can solve the problem that the problems referred to above.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, this utility model provides a kind of lightning arrester discharge current monitoring system, Realize the transmission of discharge current measurement signal using integrated optical device, overcome transmission of wireless signals and be easily subject to height in transformer station The impact of frequency electric discharge interference signal.The system spark gap end is passive system simultaneously, overcomes the circuit that Ground Electric Potential Rise causes It is easily damaged problem.
For achieving the above object, this utility model adopts the following technical scheme that:
A kind of lightning arrester discharge current monitoring system, including air core coil 1, passive integrator 2, integrated electro-optic manipulator 3, Light source 4, the first optical fiber 5, the second optical fiber 6, photo-detector 7, harvester 8;
Described first optical fiber 5 is polarization maintaining optical fibre;
Described air core coil 1 is placed on outside arrester ground lead;
The voltage signal of the output of described air core coil 1 is through the after-applied electricity to integrated electro-optic manipulator 3 of passive integrator 2 On luminescent crystal;Light source 4 connects the light input end of integrated electro-optic manipulator 3 through the first optical fiber 5;The light of integrated electro-optic manipulator 3 is defeated Go out the input that end connects photo-detector 7 through the second optical fiber 6;The outfan of photo-detector 7 is connected with harvester 8.
Described integrated electro-optic manipulator 3 includes Top electrode 9, bottom electrode 10, Light guiding channel 11 and lithium columbate crystal 12;
Integrated electro-optic manipulator utilizes the linear electro-optic effect of lithium columbate crystal 12, the light passing through in lithium columbate crystal 12 Signal phase by be applied to its surface field affected produce change.In order to realize the miniaturization of system, integrated electro-optic manipulator 3 Made using integrated light guide technology.Light guiding channel 11 is directly made in lithium columbate crystal 12 surface using etching technics, bag Include light input end, the fiber waveguide center-aisle of two equal length and light output end;Article two, the two ends of fiber waveguide center-aisle are equal It is connected with light input end and light output end;The laser signal inputting integrated electrooptic modulator 3 is divided into amplitude identical two-way Laser signal, two-way laser signal is interfered after two fiber waveguide center-aisles, exports single channel optical signal, optical signal Intensity is directly proportional to the phase contrast of light in two fiber waveguide center-aisles;
Top electrode 9 and bottom electrode 10 are made up of metal materials such as silver, be two panels thickness be millimetre-sized T-shaped sheet metal;Two The parallel in the horizontal direction both sides sticking at a fiber waveguide center-aisle of head of the T-shaped sheet metal of piece, in vertical direction with This fiber waveguide center-aisle staggers certain distance;Two outputs of the afterbody difference connected with passive integrator 2 of the T-shaped sheet metal of two panels Lead.
Staggered in T-shaped sheet metal vertical direction certain distance with this fiber waveguide center-aisle;(1) be easy to Top electrode 9 and under The output lead of electrode 10 connected with passive integrator 2;(2) Light guiding channel is equivalent to and has dug one water channel, metal on crystal Piece is placed on plane of crystal, and both vertical direction stagger certain distance.
The electric field producing between electrode when passive integrator 2 output voltage signal, electrooptic effect makes in the middle of this fiber waveguide In passage, laser phase produces change, and in two fiber waveguide center-aisles, the phase contrast of two bundle laser makes to interfere output light intensity Change, output intensity and the proportional relation of input voltage, i.e. the proportional relation with discharge current.
Described air core coil 1 carries out lightning arrester discharge current measurement by contactless, and lightning arrester discharge electric current is believed Number it is converted into the differentiated voltage signal of Scaling;
Described passive integrator 2, need not be provided separately power supply, and the differentiated voltage signal for exporting to air core coil 1 is entered Row Integral Processing;
Described light source 4 is used for exporting continuous laser signal;
Described first optical fiber 5 is used for the laser signal transmission exporting light source 4 to integrated electro-optic manipulator 3;
The signal of telecommunication that described integrated electro-optic manipulator 3 is used for exporting passive integrator 2 is converted into optical signal;
Described second optical fiber 6 is used for the optical signal transmission exporting integrated electro-optic manipulator 3 to photo-detector 7;
Described photo-detector 7 is used for converting optical signals to the signal of telecommunication, and carries out range-adjusting and impedance to the signal of telecommunication Join;
Described harvester 8 is used for gathering and record the photo-detector 7 output signal of telecommunication.
In order to ensure the concordance measuring, it is to avoid the measurement that wire wound form air core coil is brought due to winding mass inequality Dispersibility, the air core coil that described air core coil 1 is made using printed circuit board.
Described passive integrator 2 uses resistance and the passive RC integrator of electric capacity composition.
Described light source 4 is 1550nm laser instrument.Because the optical device of 1550nm wavelength and chip are highly developed, cost Relatively low, therefore adopt 1550nm laser instrument as light source 4.Light source 4 is placed in supervisory control of substation interior, and transmission range may be up to counting Km.
Described first optical fiber 5 is polarization maintaining optical fibre.Polarization state due to input light can affect the output of integrated electro-optic manipulator 3 Light intensity, in order to ensure to input stablizing of integrated electrooptic modulator 3 optical signal polarization state, therefore light source 4 and integrated electro-optic modulation Device 3 uses the first optical fiber 5 to transmit optical signal, and optical coupling is realized using FC joint in polarization maintaining optical fibre two ends.
Described second optical fiber 6 is single-mode fiber, and optical coupling is realized using using FC joint in single-mode fiber two ends.
Described photo-detector 7 includes PIN photodiode, signal amplification circuit and impedance matching circuit;PIN photoelectricity two pole Pipe converts optical signals to the signal of telecommunication, and signal amplification circuit and impedance matching circuit carry out range-adjusting and impedance to the signal of telecommunication Join.
Described harvester 8 is the configured failure wave-recording equipment of transformer station.Because transformer station has the fault record of maturation Wave device, can be used failure wave-recording equipment as harvester, when there being lightning arrester discharge electric current, fault wave recording device enters traveling wave The writing tasks such as shape, markers.Using existing equipment, the reliability of system can be improved, reduce system cost.
Above-mentioned lightning arrester discharge current monitoring system operation principle is:
Described light source 4 is used for exporting continuous laser signal;And by the first fiber-optic transfer to integrated electro-optic manipulator 3;
Air core coil 1 carries out lightning arrester discharge current measurement by contactless, and lightning arrester discharge current signal is turned Turn to the differentiated voltage signal of Scaling;
Passive integrator 2, is integrated processing to the differentiated voltage signal of air core coil 1 output;
The signal of telecommunication that passive integrator 2 exports is converted into optical signal by integrated electro-optic manipulator 3;And pass through the second optical fiber 6 Transmit to photo-detector 7;
The optical signal receiving is converted to the signal of telecommunication by photo-detector 7, and carries out range-adjusting and impedance matching;
Harvester 8 gathers and records the photo-detector 7 output signal of telecommunication, obtains lightning arrester discharge electric current.
Beneficial effect:
1) spark gap end discharge current is gathered using passive way, solves spark gap end and powers easily by Ground Electric Potential Rise The circuit causing damages problem.
2) carry out signal transmission using optical fiber, solve signal transmission and be easily disturbed problem, be simultaneously achieved spark gap end Effective and safe insulation with control room.
3) carry out data acquisition storage using the existing fault wave recording device of transformer station, improve the reliability of data acquisition, fall Low acquisition cost.
Brief description
Fig. 1 is this utility model system schematic;
Fig. 2 is this utility model system integration electrooptic modulator schematic diagram;
Wherein:1 air core coil, 2 is passive integrator, and 3 is integrated electro-optic manipulator, and 4 is light source, and 5 is the first optical fiber, 6 For the second optical fiber, 7 is photo-detector, and 8 is harvester, and 9 is Top electrode, and 10 is bottom electrode, and 11 is Light guiding channel, and 12 is niobium Sour crystalline lithium.
Specific embodiment
Below in conjunction with the accompanying drawings this utility model is further described.
As depicted in figs. 1 and 2, the utility model discloses a kind of lightning arrester discharge current monitoring system, including tubular wire Circle 1, passive integrator 2, integrated electro-optic manipulator 3, light source 4, the first optical fiber 5, the second optical fiber 6, photo-detector 7, harvester 8, Top electrode 9, bottom electrode 10, Light guiding channel 11, lithium columbate crystal 12.
Described air core coil 1 carries out current measurement by contactless, is placed on outside ground lead.In order to ensure air core coil The concordance of 1 measurement, is made using printed circuit board, it is to avoid wire wound form air core coil is uneven due to winding mass The measurement dispersibility bringing.Lightning arrester discharge current signal is converted into the differentiated voltage signal of Scaling by air core coil 1.
Described passive integrator 2 uses resistance and electric capacity composition, power supply need not be provided separately, for defeated to air core coil 1 The differentiated voltage signal going out is integrated processing.
The optical signal that described integrated electro-optic manipulator 3 is used for exporting passive integrator 2 is converted into optical signal, comprises electricity Pole 9, bottom electrode 10, Light guiding channel 11 and lithium columbate crystal 12.It utilizes the linear electro-optic effect of lithium columbate crystal 12, i.e. niobium The optical signal phase passed through in sour crystalline lithium 12 by be applied to its surface field affected produce change.In order to realize the little of system Type, integrated electro-optic manipulator 3 is made using integrated light guide technology.Light guiding channel 11 is directly made in using etching technics Lithium columbate crystal 12 surface, the optical signal inputting integrated electrooptic modulator 3 is divided into amplitude identical two ways of optical signals, two-way Optical signal is interfered after the fiber waveguide of equal length, exports single channel optical signal, the intensity of optical signal and the phase of fiber waveguide Potential difference is directly proportional.Top electrode 9 and bottom electrode 10 are made up of metal materials such as silver, be two panels thickness be millimetre-sized T-shaped metal Piece, the T-shaped parallel in the horizontal direction both sides sticking at a Light guiding channel, vertical direction is staggered with Light guiding channel Some distances, are easy to Top electrode 9 and the output lead of bottom electrode 10 connected with passive integrator 2.When passive integrator 2 exports electricity The electric field producing between electrode during pressure signal, electrooptic effect makes light phase in this Light guiding channel 11 produce change, two-beam Phase contrast makes to interfere output light intensity to change, and output intensity and the proportional relation of input voltage with discharge current be in Proportional relation.
Described light source 4 is used for exporting continuous laser signal.Optical device due to 1550nm wavelength becomes with chip very much Ripe, cost is relatively low, therefore adopts 1550nm laser instrument as light source 4.Light source 4 is placed in supervisory control of substation interior, transmission range May be up to thousands of rice.
Described first optical fiber 5 is used for for light source 4 exporting laser signal transmission to integrated electro-optic manipulator 3, due to input The polarization state of light can affect the output light intensity of integrated electro-optic manipulator 3, in order to ensure to input integrated electrooptic modulator 3 optical signal The stablizing of polarization state, therefore light source 4 and integrated electro-optic manipulator 3 use polarization maintaining optical fibre to transmit optical signal, and polarization maintaining optical fibre two ends make Realize optical coupling with FC joint.
Described second optical fiber 6 adopts single-mode fiber, for exporting the optical signal of integrated electro-optic manipulator 3, using FC joint Realize optical coupling.
Described photo-detector 7 converts optical signals to the signal of telecommunication using PIN photodiode, amplifies electricity using signal simultaneously Road, impedance matching circuit carries out range-adjusting and impedance matching to the signal of telecommunication.
Described harvester 8 is used for gathering and record the photo-detector 7 output signal of telecommunication, because transformer station has the event of maturation Barrier recording wave device, can be used failure wave-recording as harvester, when there being lightning arrester discharge electric current, fault wave recording device enters traveling wave The writing tasks such as shape, markers.Using existing equipment, improve the reliability of data acquisition, reduce acquisition cost.
Lightning arrester discharge current monitoring system of the present utility model, realizes spark gap using passive sensing and integrated light guide The measurement of discharge current and transmission, solve spark gap end and power and be easily subject to the circuit that Ground Electric Potential Rise causes to damage problem, solve Signal transmission of having determined easily is disturbed problem, is simultaneously achieved the effective and safe insulation at spark gap end and control room.Simultaneously using change The existing fault wave recording device in power station carries out data acquisition storage, improves the reliability of data acquisition, reduces acquisition cost.
Above content is the further description of this utility model specific embodiment it is impossible to assert of the present utility model Specific embodiment is only limitted to this, for this utility model person of an ordinary skill in the technical field, without departing from this On the premise of utility model design, some simple deduction or replace can also be made, all should be considered as this utility model by institute The scope of patent protection that the claims submitted to determine.

Claims (9)

1. a kind of lightning arrester discharge current monitoring system it is characterised in that:Including air core coil (1), passive integrator (2), collection Become electrooptic modulator (3), light source (4), the first optical fiber (5), the second optical fiber (6), photo-detector (7), harvester (8);
Described first optical fiber (5) is polarization maintaining optical fibre;
Described air core coil (1) is placed on outside arrester ground lead;
The voltage signal of the output of described air core coil (1) through passive integrator (2) after-applied to integrated electro-optic manipulator (3) On electro-optic crystal;Light source (4) connects the light input end of integrated electro-optic manipulator (3) through the first optical fiber (5);Integrated electro-optic manipulator (3) light output end connects the input of photo-detector (7) through the second optical fiber (6);The outfan of photo-detector (7) and collection dress Put (8) to be connected.
2. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described integrated electro-optic manipulator (3) Top electrode (9), bottom electrode (10), Light guiding channel (11) and lithium columbate crystal (12) are included;
Light guiding channel (11) etches in lithium columbate crystal (12) surface, including the fiber waveguide of light input end, two equal length Center-aisle and light output end;Article two, the two ends of fiber waveguide center-aisle are all connected with light input end and light output end;
Top electrode (9) and bottom electrode (10) are millimetre-sized T-shaped sheet metal for two panels thickness;The head of the T-shaped sheet metal of two panels exists The parallel both sides sticking at a fiber waveguide center-aisle in horizontal direction, are staggered with this fiber waveguide center-aisle in vertical direction Certain distance;Two output leads of afterbody difference connected with passive integrator (2) of Top electrode (9) and bottom electrode (10).
3. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described air core coil (1) is adopted The air core coil being made with printed circuit board.
4. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described passive integrator (2) Passive RC integrator using resistance and electric capacity composition.
5. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described light source (4) is 1550nm laser instrument.
6. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described polarization maintaining optical fibre two ends set There is FC interface, realize optical coupling using FC joint.
7. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described second optical fiber (6) be Single-mode fiber, single-mode fiber two ends are provided with FC interface, realize optical coupling using using FC joint.
8. lightning arrester discharge current monitoring system according to claim 1 it is characterised in that:Described photo-detector (7) bag Include PIN photodiode, signal amplification circuit and impedance matching circuit;PIN photodiode converts optical signals to the signal of telecommunication, Signal amplification circuit and impedance matching circuit carry out range-adjusting and impedance matching to the signal of telecommunication.
9. the lightning arrester discharge current monitoring system according to any one of claim 1~8 it is characterised in that:Described adopt Acquisition means (8) are the configured failure wave-recording equipment of transformer station.
CN201620878173.8U 2016-08-12 2016-08-12 A kind of lightning arrester discharge current monitoring system Active CN206002583U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106066421A (en) * 2016-08-12 2016-11-02 国家电网公司 A kind of lightning arrester discharge current monitoring system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106066421A (en) * 2016-08-12 2016-11-02 国家电网公司 A kind of lightning arrester discharge current monitoring system and method

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