CN103630758B - A kind of extra high voltage direct current transmission line space DC electric field measurement device - Google Patents
A kind of extra high voltage direct current transmission line space DC electric field measurement device Download PDFInfo
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- CN103630758B CN103630758B CN201310658120.6A CN201310658120A CN103630758B CN 103630758 B CN103630758 B CN 103630758B CN 201310658120 A CN201310658120 A CN 201310658120A CN 103630758 B CN103630758 B CN 103630758B
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Abstract
A kind of extra high voltage direct current transmission line space DC electric field measurement device, it comprises two pieces of detection pole plates be parallel to each other, high insulation dry-reed relay and Signal acquiring and processing circuit, two pieces of detection pole plates be placed in tested electric field and with the E-field normal of sensing point, induced voltage is therebetween delivered to the input end of Signal acquiring and processing circuit through two pairs of normally closed contacts of height insulation dry-reed relay and after two pairs of normally opened contacts commutations of height insulation dry-reed relay, is received the input end of Signal acquiring and processing circuit; The control coil of described height insulation dry-reed relay connects square-wave generator.The present invention utilizes high insulation dry-reed relay that the induced voltage between two pieces of detection pole plates is modulated into AC signal, not only eliminate the impact of the drift of subsequent conditioning circuit temperature and offset voltage, and exploring electrode does not have machinery to rotate, there is structure simple, with low cost, easy to carry, reliable operation, measures the advantages such as accurate.
Description
Technical field
The present invention relates to the copped wave measurement mechanism of a kind of extra high voltage direct current transmission line space DC electric field, belong to field of measuring technique.
Background technology
Compared with conventional AC technology of transmission of electricity, the advantages such as the loss that extra-high voltage direct-current transmission has that multi-line power transmission ability is strong, loss is little, both sides AC system does not need synchronous operation, cause electrical network when breaking down is little, are particularly suitable for long apart from point-to-point bulk power transmission.But the DC electric field of DC power transmission line underlying space can affect greatly the electromagnetic environment of Near Ground; in order to meet the requirement of environmental protection; reduce the contradiction because electromagnetic environment problem causes and legal dispute, the DC electric field intensity in Measurement accuracy power transmission line corridor space is significant.
At present, mainly contain two kinds both at home and abroad to the measuring method of DC electric field, one utilizes electrooptical effect principle, and one utilizes electrostatic induction principle.Electrooptical effect method mainly utilizes some crystal Pockels effect in the electric field, electric field intensity information is obtained by the light signal measured by electric field intensity modulation, its weak point is that the machining accuracy of optical crystal requires very high, be subject to temperature, stress and birefringent impact, in addition, due to the migration of photodetection crystal element inner ion and the accumulation of space charge, very easily make electric field to be measured distort, above-mentioned limitation causes the method to fail to be used widely.Electrostatic induction method adopts the method for rotated detection electrode usually, space DC electric field is responded to the charge signal obtained on exploring electrode and is modulated into AC signal, to eliminate the impact of the drift of subsequent conditioning circuit temperature and offset voltage.Because this type of measuring method needs mechanical vibration or rotation, signal is drawn comparatively difficult from electrode, when utilizing brush to draw signal, because brush wear easily causes contact resistance variation, there is the problem of the jitter of drawing, meanwhile, when 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 and utilizes integrating circuit to carry out the report measured, but there is significant limitation in practice in the movement of electrode, manual traveling electrode is obviously unpractical, so only have and moved by drive unit and track, this will certainly increase the volume of measuring sonde, make electric field generation Severe distortion to be measured, measurement result loses reference value.
Summary of the invention
The object of the invention is to the drawback for prior art, provide that a kind of structure is simple, easy to make, reliable operation and the high extra high voltage direct current transmission line space DC electric field measurement device of measuring accuracy.
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 pieces of detection pole plates be parallel to each other, high insulation dry-reed relay and Signal acquiring and processing circuit, two pieces of detection pole plates be placed in tested electric field and with the E-field normal of sensing point, induced voltage is therebetween delivered to the input end of Signal acquiring and processing circuit through two pairs of normally closed contacts of height insulation dry-reed relay and after two pairs of normally opened contacts commutations of height insulation dry-reed relay, is received the input end of Signal acquiring and processing circuit; The control coil of described height insulation dry-reed relay connects square-wave generator.
Above-mentioned extra high voltage direct current transmission line space DC electric field measurement device, described Signal acquiring and processing circuit comprises data collecting card, terminal monitor and three operational amplifiers, first operational amplifier and the second operational amplifier are connected into two voltage followers respectively, the input end of two voltage followers detects pole plate through the contact of height insulation dry-reed relay be connected with two piece respectively, their output terminal connects in-phase input end and the inverting input of the 3rd operational amplifier respectively, the output terminal of input termination the 3rd operational amplifier of described data collecting card, export 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 and data collecting card are gone between by USB and be connected.
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 the induced voltage between two pieces of detection pole plates is modulated into AC signal, acquisition sensor does not need mechanical motion, rely on relay to be that ac square wave signal reaches the object eliminating offset voltage and temperature drift by direct current signal electrical modulation, realize the measurement of DC electric field.This not only eliminates the impact of the drift of subsequent conditioning circuit temperature and offset voltage, and exploring electrode does not have machinery to rotate, and have structure simple, with low cost, easy to carry, reliable operation, measures the advantages such as accurate, overcomes the deficiency of existing measurement mechanism well.
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
For the measurement of extra high voltage direct current transmission line DC electric field, usually need to measure the DC electric field in space below the height of distance 2 meters, ground below direct current high tension transmission circuit, this direction of an electric field is generally vertical direction, and parallel placement answered by detection pole plate, 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) that the DC induction pressure signal between two exploring electrodes is converted to the alternating signal of certain frequency, carries out the measurement of DC electric field.
Referring to Fig. 1, the present invention is made up 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 pole B is the circular aluminium sheet metal of diameter 300mm, thickness 3mm; The model of high insulation dry-reed relay K is MAR5V-2C, and play double-pole reversing switch, its insulation impedance is up to 10
15Ω; Dry-reed relay is a kind of relay utilizing coil electromagnetism power directly to control the switching of tongue tube inner contact switch, when having electric current to flow through in the coil of dry-reed relay, the magnetic field that coil produces makes the irony tongue magnetization be sealed in tongue tube, wherein often open tongue become on-state under magneticaction for two, two normally closed tongues become released state under magneticaction, and namely closed, the normally closed contact of normally opened contact disconnects.When in coil, no current flows through, coil no longer produces magnetic field, and the tongue of tongue tube inside relies on its own resilient to automatically restore to original position, i.e. normally opened contact disconnection, normally closed contact close.Apply a square-wave signal to the coil of relay, periodically control adhesive and the release of its contact, thus realize the electronics handoff functionality of dpdt double-pole double-throw (DPDT) reversing switch.Present invention utilizes the double-pole commutation function of dry-reed relay, require to have quite high insulation impedance (being greater than 100T Ω) between its contact and contact, between contact and shell, leakage current exists
fthe order of magnitude of A.First operational amplifier U1 and the second operational amplifier U2 adopts electrometer level amplifier OPA128, and the 3rd operational amplifier U3 adopts accurate unit amplifier INA105, 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, detection pole plate is placed in electric field to be measured and is connected with instrument container by two shielded cables, and 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 pole B spacing are d, be placed in electric field E to be measured, the two detection parallel placements of pole plate are also vertical in E direction, and responding to the voltage signal obtained between two detection pole plates is u, and it is V that this voltage signal finally exports square-wave signal voltage amplitude after modulation and filter amplifying processing, full gain coefficient is G, then: E=u/d, V=Gu, E=V/Gd, by monitoring the amplitude V of square-wave signal, just electric field strength E to be measured can be obtained.
Fig. 2 is Survey Software program principle block diagram.This software is based on LabView Development of Software Platform, first usb data analog input card is utilized to change voltage signal acquisition to be measured into digital signal, then wave filter subfunction module and amplifier subfunction module is utilized, filtering carried out to signal and amplifies process, recycling its figure display translation window and data group output window output waveform, voltage and field intensity.
Fig. 3 gives at certain ± 800kV DC power transmission line below apart from the measurement result of ground 1m height.In figure, measuring point coordinate is starting point from positive polarity transmission pressure in the vertical projection of ground surface, the DC electric field distribution results that perpendicular distal obtains from starting point every 1m measurement.This result conforms to the calculated results, and it is correct for indicating measuring method.
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 pieces of detection pole plates be parallel to each other, high insulation dry-reed relay (K) and Signal acquiring and processing circuit, two pieces of detection pole plates be placed in tested electric field and with the E-field normal of sensing point, induced voltage is therebetween delivered to the input end of Signal acquiring and processing circuit through insulate two pairs of normally closed contacts of dry-reed relay (K) of height and after two pairs of normally opened contacts commutations of height insulation dry-reed relay (K), receives the input end of Signal acquiring and processing circuit; The control coil of described height insulation dry-reed relay (K) connects square-wave generator.
2. a kind of extra high voltage direct current transmission line space according to claim 1 DC electric field measurement device, it is characterized in that, described Signal acquiring and processing circuit comprises data collecting card (U4), terminal monitor (PC) and three operational amplifiers, first operational amplifier (U1) and the second operational amplifier (U2) are connected into two voltage followers respectively, the input end of two voltage followers detects pole plate through the contact of height insulation dry-reed relay (K) be connected with two piece respectively, their output terminal connects in-phase input end and the inverting input of the 3rd operational amplifier (U3) respectively, the output terminal of the input termination the 3rd operational amplifier (U3) of described data collecting card (U4), export termination terminal monitor (PC).
3. a kind of extra high voltage direct current transmission line space according to claim 2 DC electric field measurement device, it is characterized in that, described terminal monitor (PC) adopts notebook computer, and it and data collecting card (U4) are gone between by USB and be connected.
4. a kind of extra high voltage direct current transmission line space according to claim 3 DC electric field measurement device, it 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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| 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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| CN103630758B true CN103630758B (en) | 2016-04-06 |
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| 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 |
| CN113640590B (en) * | 2021-09-07 | 2023-03-24 | 浙江大学 | System and method for detecting electric field intensity under direct-current transmission line |
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| 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 |
| CN201177870Y (en) * | 2007-12-19 | 2009-01-07 | 中国电力科学研究院 | DC combination electric field and ion stream density measuring system |
| CN103091565A (en) * | 2013-01-31 | 2013-05-08 | 北京森馥科技有限公司 | Detecting method and detecting system for direct current combined field strength |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62212576A (en) * | 1986-03-14 | 1987-09-18 | Fujitsu Ltd | Apparatus for measuring intensity of electric field |
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Patent Citations (5)
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| 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 |
| CN201177870Y (en) * | 2007-12-19 | 2009-01-07 | 中国电力科学研究院 | DC combination electric field and ion stream density measuring system |
| CN103091565A (en) * | 2013-01-31 | 2013-05-08 | 北京森馥科技有限公司 | Detecting method and detecting system for direct current combined field strength |
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