CN103630758A - Ultra-high voltage direct-current transmission line space direct-current electric field measuring device - Google Patents
Ultra-high voltage direct-current transmission line space direct-current electric field measuring device Download PDFInfo
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- CN103630758A CN103630758A CN201310658120.6A CN201310658120A CN103630758A CN 103630758 A CN103630758 A CN 103630758A CN 201310658120 A CN201310658120 A CN 201310658120A CN 103630758 A CN103630758 A CN 103630758A
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Abstract
An ultra-high voltage direct-current transmission line space direct-current electric field measuring device comprises two mutually parallel detection electrode plates, a high-insulation dry reed relay and a signal acquisition and processing circuit. The detection electrode plates are disposed in a tested electric field and perpendicular to an electric field of a sensing point, and induced voltage between the detection electrode plates are transmitted to an input end of the signal acquisition and processing circuit via two pairs of normally-closed contacts of the high-insulation dry reed relay and switched to the input end of the signal acquisition and processing circuit after being reversed by the normally-closed contacts of the high-insulation dry reed relay. A control coil of the high-insulation dry reed relay is connected with a square-wave generator. The induced voltage between the detection electrode plates is modulated into alternating-current signals by adopting the high-insulation dry reed relay, the affection of follow-up circuit temperature drift and offset voltage is removed, and detection electrodes are free of mechanical rotation, so that the ultra-high voltage direct-current transmission line space direct-current electric field measuring device has the advantages of being simple in structure, low in cost, convenient to carry, reliable in operation, accurate in measurement and the like.
Description
Technical field
The copped wave measurement mechanism that the present invention relates to a kind of extra high voltage direct current transmission line space DC electric field, belongs to field of measuring technique.
Background technology
Compare with conventional AC technology of transmission of electricity, the advantages such as extra-high voltage direct-current transmission has that circuit ability to transmit electricity is strong, loss is little, both sides AC system does not need synchronous operation, electrical network is caused while breaking down loss is little, are particularly suitable for the point-to-point high-power transmission of electricity of long distance.But under DC power transmission line, the DC electric field of side space can affect greatly the electromagnetic environment of Near Ground; in order to meet the requirement of environmental protection; contradiction and legal dispute that minimizing causes because of electromagnetic environment problem, the DC electric field intensity in Measurement accuracy power transmission line corridor space is significant.
At present, the measuring method of DC electric field is mainly contained to two kinds both at home and abroad, a kind of is to utilize electrooptical effect principle, and a kind of is to utilize electrostatic induction principle.Electrooptical effect method is mainly to utilize the Pockels effect of some crystal in electric field, by measurement, be subject to the light signal of electric field intensity modulation to obtain electric field intensity information, it is very high that its weak point is that the machining accuracy of optical crystal requires, be subject to temperature, stress and birefringent impact, in addition, accumulation due to the inner ion migration of photodetection crystal element and space charge, very easily makes electric field to be measured distort, and above-mentioned limitation causes the method to fail to be used widely.Electrostatic induction method adopts the method for rotated detection electrode conventionally, space DC electric field is responded on exploring electrode to the charge signal obtaining and is modulated into AC signal, to eliminate subsequent conditioning circuit temperature, floats the impact with offset voltage.Because this type of measuring method needs mechanical vibration or rotation, from electrode, draw comparatively difficulty of signal, while utilizing brush to draw signal, because brush wear easily causes contact resistance variation, the problem of the jitter that existence is drawn, meanwhile, while measuring in the wild, because the reasons such as dust storm easily cause electrode rotary speed unstabilization fixed, also can cause measuring error and measure difficulty.Electrostatic induction method also has by mobile exploring electrode the report that utilizes integrating circuit to measure, but there is significant limitation in the movement of electrode in practice, hand-driven moving moving electrode is obviously unpractical, only have so by drive unit and track and move, this will certainly increase the volume of measuring sonde, make electric field to be measured that serious distortion occur, measurement result loses reference value.
Summary of the invention
The object of the invention is to the drawback for prior art, a kind of simple in structure, easy to make, reliable operation and the high extra high voltage direct current transmission line space DC electric field measurement device of measuring accuracy are provided.
Problem of the present invention realizes with following technical proposals:
A kind of extra high voltage direct current transmission line space DC electric field measurement device, formation comprises two detection pole plates that are parallel to each other, high insulation dry-reed relay and signals collecting and treatment circuit, survey pole plates for two and be placed in tested electric field vertical with the electric field of sensing point, the induced voltage between the two is delivered to the input end of signals collecting and treatment circuit and after two pairs of normally opened contacts of height insulation dry-reed relay commutate, is received the input end of signals collecting and treatment circuit through two pairs of normally closed contacts of height insulation dry-reed relay; The control coil of described high insulation dry-reed relay connects square-wave generator.
Above-mentioned extra high voltage direct current transmission line space DC electric field measurement device, described signals collecting and treatment circuit comprise data collecting card, terminal monitor and three operational amplifiers, the first operational amplifier and the second operational amplifier are connected into respectively two voltage followers, the input end of two voltage followers is connected with two detection pole plates through the contact of height insulation dry-reed relay respectively, their output terminal connects respectively in-phase input end and the inverting input of the 3rd operational amplifier, the output terminal of input termination the 3rd operational amplifier of described data collecting card, output termination terminal monitor.
Above-mentioned extra high voltage direct current transmission line space DC electric field measurement device, described terminal monitor adopts notebook computer, and it is gone between and is connected by USB with data collecting card.
Above-mentioned extra high voltage direct current transmission line space DC electric field measurement device, described detection pole plate is circular metal plate.
The present invention utilizes high insulation dry-reed relay that two induced voltages of surveying between pole plate are modulated into AC signal, acquisition sensor does not need mechanical motion, relying on relay is that ac square wave signal reaches elimination offset voltage and warm object of floating by direct current signal electrical modulation, realizes the measurement of DC electric field.This has not only eliminated subsequent conditioning circuit temperature and has floated the impact with offset voltage, and exploring electrode do not have machinery rotation, has simple in structurely, with low cost, easy to carry, and reliable operation, measures the advantages such as accurate, overcome well the deficiency of existing measurement mechanism.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is electrical schematic diagram of the present invention;
Fig. 2 is Survey Software program principle block diagram;
Fig. 3 is the measurement result of an embodiment.
In figure, each label is: U1, the first operational amplifier, U2, the second operational amplifier, U3, the 3rd operational amplifier, U4, data collecting card, PC, terminal monitor, K, high insulation dry-reed relay, A, upper detection pole plate, B, lower detection pole plate, E, electric field.
Embodiment
Measurement for extra high voltage direct current transmission line DC electric field, conventionally need to measure the DC electric field in 2 meters of following spaces of height apart from ground, direct current high tension transmission circuit below, this direction of an electric field is generally vertical direction, and survey pole plate and answer parallel placement, and vertical with direction of an electric field.In order to overcome the deficiency of existing filed detection method, the present invention adopts the method for copped wave (electrical modulation) to press signal to be converted to the alternating signal of certain frequency the DC induction between two exploring electrodes, carries out the measurement of DC electric field.
Referring to Fig. 1, the present invention is comprised of the first operational amplifier U1, the second operational amplifier U2, the 3rd operational amplifier U3, data collecting card U4, terminal monitor PC, high insulation dry-reed relay K, upper detection pole plate A, lower detection pole plate B.
Upper detection pole plate A and lower detection utmost point B are the circular aluminium sheet metal of diameter 300mm, thickness 3mm; The model of high insulation dry-reed relay K is MAR5V-2C, plays double-pole reversing switch, and its insulation impedance is up to 10
15Ω; Dry-reed relay is a kind of relay that utilizes coil electromagnetism power directly to control the switching of tongue tube inner contact switch, while having electric current to flow through in the coil of dry-reed relay, the magnetic field that coil produces makes to be sealed in the irony tongue magnetization in tongue tube, wherein often open tongue become on-state under magneticaction for two, two normally closed tongues become released state under magneticaction, and normally opened contact closure, normally closed contact disconnect.When in coil, no current flows through, coil no longer produces magnetic field, and the tongue dependence of tongue tube inside self elastic force automatically restores to original position, i.e. normally opened contact disconnection, normally closed contact closure.Apply a square-wave signal to the coil of relay, periodically control adhesive and the release of its contact, thereby realize the electronics handoff functionality of dpdt double-pole double-throw (DPDT) reversing switch.The present invention has utilized the double-pole commutation function of dry-reed relay, requires between its contact and contact, has quite high insulation impedance (being greater than 100T Ω) between contact and shell, and leakage current exists
fthe order of magnitude of A.The first operational amplifier U1 and the second operational amplifier U2 adopt electrometer level amplifier OPA128, and the 3rd operational amplifier U3 adopts the accurate amplifier INA105 of unit, and three operational amplifiers form the instrument discharge circuit of high input impedance, and input impedance reaches 10
15Ω.
High insulation dry-reed relay K, three operational amplifiers and data collecting card USB6210 are placed in an instrument container, survey pole plate and be placed in electric field to be measured and be connected with instrument container by two shielded cables, the data collecting card U4 in instrument container is connected with notebook terminal by usb data cable.
If upper detection pole plate A and lower detection utmost point B spacing are d, be placed in electric field E to be measured, two survey the parallel placement of pole plate vertical in E direction, and the voltage signal that between two detection pole plates, induction obtains is u, and this voltage signal final output square-wave signal voltage amplitude after modulation and filter amplifying processing is V, full gain coefficient is G,: E=u/d, V=Gu, E=V/Gd, amplitude V by monitoring square-wave signal, just can obtain electric field strength E to be measured.
Fig. 2 is Survey Software program principle block diagram.This software is based on LabView Development of Software Platform, first utilize usb data analog input card to change voltage signal acquisition to be measured into digital signal, then utilize wave filter subfunction module and amplifier subfunction module, signal is carried out filtering and amplifies and process, recycle its figure and show output window and data group output window output waveform, voltage and field intensity.
Provided at certain ± 800kV of Fig. 3 DC power transmission line below is apart from the measurement result of ground 1m height.In figure, measuring point coordinate is in the vertical projection of ground surface, to be starting point from positive polarity transmission pressure, the DC electric field distribution results that perpendicular distal measures every 1m from starting point.This result conforms to the calculated results, has shown that measuring method is correct.
Claims (4)
1. an extra high voltage direct current transmission line space DC electric field measurement device, it is characterized in that, it comprises two detection pole plates that are parallel to each other, high insulation dry-reed relay (K) and signals collecting and treatment circuit, survey pole plates for two and be placed in tested electric field vertical with the electric field of sensing point, the induced voltage between the two is delivered to the input end of signals collecting and treatment circuit and after two pairs of normally opened contacts of height insulation dry-reed relay (K) commutate, is received the input end of signals collecting and treatment circuit through insulate two pairs of normally closed contacts of dry-reed relay (K) of height; The control coil of described high insulation dry-reed relay (K) connects square-wave generator.
2. a kind of extra high voltage direct current transmission line according to claim 1 space DC electric field measurement device, it is characterized in that, described signals collecting and treatment circuit comprise data collecting card (U4), terminal monitor (PC) and three operational amplifiers, the first operational amplifier (U1) is connected into respectively two voltage followers with the second operational amplifier (U2), the input end of two voltage followers is connected with two detection pole plates through the contact of height insulation dry-reed relay (K) respectively, their output terminal connects respectively in-phase input end and the inverting input of the 3rd operational amplifier (U3), the output terminal of input termination the 3rd operational amplifier (U3) of described data collecting card (U4), output termination terminal monitor (PC).
3. a kind of extra high voltage direct current transmission line according to claim 1 and 2 space DC electric field measurement device, is characterized in that, described terminal monitor (PC) adopts notebook computer, and it is gone between and be connected by USB with data collecting card (U4).
4. a kind of extra high voltage direct current transmission line according to claim 3 space DC electric field measurement device, is characterized in that, described detection pole plate is circular metal plate.
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| CN201310658120.6A CN103630758B (en) | 2013-12-09 | 2013-12-09 | A kind of extra high voltage direct current transmission line space DC electric field measurement device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896839A (en) * | 2018-09-27 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of measurement method of the DC electric field based on high-speed analog switch |
| CN113640590A (en) * | 2021-09-07 | 2021-11-12 | 浙江大学 | System and method for detecting electric field intensity under direct-current transmission line |
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| JPS62212576A (en) * | 1986-03-14 | 1987-09-18 | Fujitsu Ltd | Apparatus for measuring intensity of electric field |
| CN2645337Y (en) * | 2003-06-02 | 2004-09-29 | 唐建北 | Power supply converter |
| CN1924593A (en) * | 2006-07-14 | 2007-03-07 | 华北电力大学 | DC electric filed detection method of insulator for high-voltage DC transmission line |
| CN201063195Y (en) * | 2007-07-05 | 2008-05-21 | 国网武汉高压研究院 | Measuring apparatus for DC synthesis field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896839A (en) * | 2018-09-27 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of measurement method of the DC electric field based on high-speed analog switch |
| CN113640590A (en) * | 2021-09-07 | 2021-11-12 | 浙江大学 | System and method for detecting electric field intensity under direct-current transmission line |
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| CN103630758B (en) | 2016-04-06 |
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