CN201892707U - Measuring system for electric field - Google Patents
Measuring system for electric field Download PDFInfo
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- CN201892707U CN201892707U CN2010205037809U CN201020503780U CN201892707U CN 201892707 U CN201892707 U CN 201892707U CN 2010205037809 U CN2010205037809 U CN 2010205037809U CN 201020503780 U CN201020503780 U CN 201020503780U CN 201892707 U CN201892707 U CN 201892707U
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Abstract
The utility model discloses a measuring system for an electric field, which comprises a three-dimensional electric field probe, a signal preprocessing unit, an A/D (analog/digital) conversion unit and a data processing unit, wherein the three-dimensional electric field probe comprises three groups of measuring electrodes; each group of the measuring electrodes corresponds to the measuring of electric field strength in X, Y and Z directions of the electric field respectively; the signal preprocessing unit comprises three signal preprocessing circuits; each signal preprocessing circuit comprises a preamplification module, a filtering module and an effective value conversion module; the signal input end of each signal preprocessing circuit is connected with the signal output end of each corresponding measuring electrode; electric field strength signal is processed by the signal preprocessing circuit, converted by the A/D conversion unit and then fed into the data processing unit; the measuring device works stably, is convenient to carry and install, has strong interference resistance and lower manufacturing cost, can be popularized and applied in the electrical power system in large quantity, is used for the monitoring of electromagnetic environment, field strength caution in an operation field, etc., and has good application prospect and wide application scope.
Description
Technical field
The utility model relates to electric power checkout equipment field, particularly a kind of electric field measurement system.
Background technology
Along with the raising of electric pressure, not only the Electric Field Distribution of power transmission and transforming equipment itself becomes the focus of research in recent years, and the electric system electromagnetic compatibility problem also more and more causes people's attention.In the transformer station of voltage levels; electromagnetic environment is quite abominable; particularly when switching manipulation; the transient electromagnetic field fast, that amplitude is high can change; the transient electromagnetic field that this variation is fast, amplitude is high will be disturbed the protection and the strong electromagnetism thousand of opertaing device generation of secondary side, when serious even protection and opertaing device river accidents caused and the damage secondary side.And the means of adopt measuring to survey to obtain corresponding data to the power frequency electric field of transformer station and Transient Electric Field can be that the research of electric system electromagnetic compatibility problem provides true foundation.In addition, aspect EMC research, except that the electric system electromagnetic compatibility problem, much also there is electromagnetic compatibility problem in other field, all needs the measurement of space electric field to support as its experiment.
The operating personnel is under the environment of high pressure power frequency electric field, during especially at the climbing shaft tower or near high voltage alive equipment, the staff can swarm into the high field intensity district by mistake, if the operating personnel will work long hours and but knows nothing under the situation that does not have caution, this just might cause personal injury.
Existing detection technique is divided two aspects.The one, optical profile type electric field measurement method.Advantages such as this method has good insulation preformance, response speed is fast, safe, volume is little and in light weight still this class electric-field sensor often cost an arm and a leg, and in the middle of actual measurement, the optical profile type electric-field sensor also has many problems to overcome.Such as, because electrooptical effect itself has temperature dependency, therefore generally there is the problem of temperature drift based on the electric-field sensor of electrooptical effect; When utilizing electro-optic crystal induced static or ELF (Extremely Low Frequency) electric field, will produce the change of charge shift and Electric Field Distribution in the crystal, cause exporting the transducing signal problem of unstable; Equally, the existence of space free electric charge and the gathering of sensing plane of crystal in the tested electric field also can influence the crystal internal electric field and distribute.
Be electrical principles electric field measurement method in addition on the one hand: the method for utilizing electrical principles to carry out the electric field detection at present has a lot, but its ultimate principle is: the conductor sensor surface that is in the electric field can produce induced charge, at the needs of measuring the different frequency electric field, design corresponding sensor construction and sample circuit, induced charge is converted to the curtage signal that certain corresponding relation is arranged with electric field intensity to be measured, again signal is analyzed, thereby obtained electric field intensity.For example: the rotary vane type electric field instrument of Lanzhou Plateau Atmosphere Physics, Inst., Chinese Academy of Sciences's design in 1993, this electric-field sensor potential electrode is made up of a fixing metal sensing chip and the certain ground connection rotor of rotating speed, when the ground connection rotor rotates, sensing chip will alternately conductively-closed and exposure in electric field, the electric charge that will change on the sensing chip surface.If use a resistance that sensing chip is connected with ground, then just have exchange current on the resistance and flow through, measure this size of current and just know electric field value.And for example the charged detector of composite insulator is held in the power transformation of electrical engineering system of Shanghai Communications University in 2004 design, judging the inside conduction fault of insulator by the longitudinal electric field intensity of measuring composite insulator, also is the dc electric field measurement that the method that adopts the rotary vane type power transformation to hold is carried out composite insulator.
Domestic and international increasing scientific research institution and power department are recognized the importance of electric field measurement since the nineties, but thereby comparatively expensive popularization and the use that has influenced them of these achievement in research complexity and price.
Therefore, research cost is lower, easy to operate and have the electric field measurement device of alarm function, to guaranteeing operating personnel's safety, improves the safety coefficient of electrical production, and it is significant to reduce accident rate.
Summary of the invention
In view of this, the purpose of this utility model provides a kind of electric field measurement system, has low cost of manufacture, easy to operate, antijamming capability is strong and use advantages such as flexible.
The purpose of this utility model is achieved through the following technical solutions:.
Electric field measurement system of the present utility model, comprise the three-dimensional electric field probe, the Signal Pretreatment unit, A/D converting unit and data processing unit, described three-dimensional electric field probe comprises three groups of potential electrode, each group potential electrode is the X of corresponding electric field respectively, Y, electric field intensity measuremenrt on the Z direction, described Signal Pretreatment unit comprises three road signal pre-processing circuits, each road signal pre-processing circuit includes pre-amplifying module, filtration module and effective value modular converter, the signal input part of each road signal pre-processing circuit is connected to the signal output part of corresponding potential electrode respectively, electric field intensity signal after signal pre-processing circuit is handled is sent into data processing unit after changing by the A/D converting unit.
Further, described electric field measurement system also comprises wireless transmit/receive units, described wireless transmit/receive units comprises with the joining device end module of data processing unit with the joining PC of outer PC holds module, and described wireless transmit/receive units is used to realize the real-time Transmission of electric field intensity data and the controlled in wireless between three-dimensional electric field probe and the PC;
Further, described three-dimensional electric field probe adopts cube structure, forms an induction electrode relatively by its pole plate separately between per two corresponding surfaces;
Further, described pre-amplifying module and filtration module are formed the active bandwidth-limited circuit of Butterworth second order;
Further, described pre-amplifying module comprises first operational amplifier, the first amplifier resistance, filter capacitor, first stake resistance and direct earth capacitance, one end of described filter capacitor is as the filtering input end, the other end inserts the in-phase input end of first operational amplifier, one end of described direct earth capacitance and filter capacitor link as an end of filtering input end, other end ground connection, described direct earth capacitance are connected with the first amplifier resistance with the common junction of filter capacitor and are afterwards inserted the output terminal of first operational amplifier; One end of described first stake resistance and the in-phase input end of first operational amplifier link, other end ground connection, and the inverting input of described first operational amplifier and its output terminal link;
Further, described bandpass filtering modules block comprises second operational amplifier, the second amplifier resistance, isolation resistance and second stake resistance;
The inverting input of described second operational amplifier links by the output terminal of the isolation resistance and first operational amplifier, the described second amplifier resistance string is associated between the inverting input and output terminal of second operational amplifier, and the in-phase input end of described second operational amplifier is by second ground resistance earth; The output terminal of described second operational amplifier links by the input end of output resistance and data processing unit;
Further, described effective value modular converter comprises real effective conversion chip and peripheral circuit thereof;
Further, described real effective conversion chip is AD637;
Further, described system also comprises the display alarm unit, and described display alarm unit and data processing unit link;
Further, described data processing unit comprises single-chip microcomputer and peripheral circuit thereof.
The beneficial effects of the utility model are:
1. the utility model is measured power frequency electric field by utilizing electrical principles electric field measurement method, because this three-dimensional electric field sensor is by axially (Z) and radially (X, Y) three road electric field measurement circuit and six induction electrodes are formed, every drive test amount circuit still with the difference of two symmetrical induction electrode charge variation as measuring-signal to overcome the influence of high-altitude charged particle, so antijamming capability is extremely strong.
2. this measurement mechanism working stability can be made the small size device, to electric field influence is little on every side, is easy to carry and installs, and works alone, and it is little to be affected by the external environment;
3. the expensive price of electric field measurement instrument relatively at present, the installation cost that the present invention makes is lower, can apply in electric system in enormous quantities, be used for electromagnetic environment monitor, the field intensity caution of operation field etc., have a good application prospect and usable range widely;
4. this device is applied to the electric field data transmission with wireless radio-frequency, has further increased the dirigibility and the usable range of this electric field measurement device.
Other advantages of the present utility model, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can realize and obtain by following instructions and claims.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail, wherein:
Fig. 1 is each unit connection diagram of the present utility model;
Fig. 2 is a three-dimensional electric field sonde configuration model synoptic diagram;
Fig. 3 is the circuit connection diagram of pre-amplification circuit;
Fig. 4 is the circuit connection diagram of filtering circuit;
Fig. 5 is the circuit connection diagram of effective value change-over circuit;
Fig. 6 is the connection diagram of wireless transmit/receive units;
Fig. 7 is a workflow diagram of the present utility model.
Embodiment
Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.Should be appreciated that preferred embodiment only for the utility model is described, rather than in order to limit protection domain of the present utility model.
As shown in Figure 1, electric field measurement system of the present utility model comprises three-dimensional electric field probe 1, Signal Pretreatment unit 2, A/D converting unit 3 and data processing unit 4, has also comprised as further improved wireless transmit/receive units 5 and display alarm unit 6.In the present embodiment, the processor that system adopts is C8051F020, and chip integration becomes the A/D converting unit of 12 sampling rate 200sps, can be used for the conversion of signals that analog front end circuit collects is become data-signal.The reference voltage of AD sampling is produced by the processor inside programming, and size is 2.4V, can be signal reliable samples between the 0-2.4V to amplitude.The AD converting unit has 8 acquisition channels, and system opens 3 passages and is used for the three-dimensional electric field data acquisition.
According to general electric field measurement instrument requirement, processor adopting timer timing sampling, sample frequency is 1KHz, carries out the average processing to being higher than the data of power frequency period in the time, obtains accurate Electric Field Numerical.Situation about constantly changing with factor affecting such as environment, loads according to the electric field data, device carries out average to the electric field data in the different time scope to be handled, and will show average electric field numerical value, maximal value and the minimum value etc. of different time sections such as 30S, 1min, 2min and 5min.
As shown in Figure 2, the three-dimensional electric field probe 1 in the present embodiment adopts cube structure, forms an induction electrode relatively by its pole plate separately between per two corresponding surfaces, and one has three groups of potential electrode.These three groups of potential electrode are three directions (X, Y, Z direction) of corresponding electric field respectively, and each group parallel-plate electrode records the electric field value with its corresponding direction, and final electric field value can be expressed as E=
, the three-dimensional electric field probe is ajusted with three-legged support, can measure the three-dimensional electric field numerical value of this position; In power frequency electric field is used, can be regardless of the putting position of three-dimensional electric field probe, thus obtaining whole electric field value easily, such structure is that electric field measurement has brought facility.
In the present embodiment, pre-amplifying module 21 and filtration module 22 are formed the active bandwidth-limited circuit of Butterworth second order.As shown in Figure 3, wherein, pre-amplifying module 21 comprises the first operational amplifier U1, the first amplifier resistance R 15, filter capacitor C40, the first stake resistance R16 and direct earth capacitance C15, the end of filter capacitor C40 is as the filtering input end, the other end inserts the in-phase input end of the first operational amplifier U1, the end of direct earth capacitance C15 and filter capacitor C40 link as an end of filtering input end, other end ground connection, direct earth capacitance C15 connects with the first amplifier resistance R 15 with the common junction of filter capacitor C40 and afterwards inserts the output terminal of the first operational amplifier U1; The end of the first stake resistance R16 and the in-phase input end of the first operational amplifier U1 link, other end ground connection, and the inverting input of the first operational amplifier U1 and its output terminal link.
As shown in Figure 4, filtration module comprises the second operational amplifier U2, the second amplifier resistance R 22, isolation resistance R5 and the second stake resistance R20;
The inverting input of the second operational amplifier U2 links by the output terminal of the isolation resistance R5 and the first operational amplifier U1, the second amplifier resistance R 22 is connected between the inverting input and output terminal of the second operational amplifier U2, and the in-phase input end of the second operational amplifier U2 is by the second stake resistance R20 ground connection; The output terminal of the second operational amplifier U2 links by the input end of output resistance U14 and data processing unit 4.
In the present embodiment, the first operational amplifier U1 and the second operational amplifier U2 all adopt OP07C.
As shown in Figure 5, in the present embodiment, effective value modular converter 23 comprises real effective conversion chip and peripheral circuit thereof.Wherein, the real effective conversion chip has adopted AD637, can convert 2v to direct current signal with interior AC signal.
As shown in Figure 6, wireless transmit/receive units 5 of the present utility model comprises with data processing unit 4 joining device end modules 51 with the joining PC of outer PC holds module 52, device end module 51 is used for real-time Transmission electric field data, simultaneously the receiving transducer operation command signal; 52 of PC end modules link to each other with PC by serial ports, and main effect is to carry out wireless transmission and the reception and the conversion of the operational order of popping one's head in after the measurement data conversion.
System also comprises display alarm unit 6, and display alarm unit 6 links with data processing unit 4.In the present embodiment, the display alarm unit is integrated display module and alarm module is respectively applied for and realizes that external data shows and sound and light of alarm.
As shown in Figure 7, the workflow of this electric field measurement system is as follows: after the start, system carries out initialization, and self check is carried out in each working cell; AD conversion unit in the single-chip microcomputer sheet voltage signal that begins that signal processing unit is recorded carries out the AD conversion then; After finishing a change-over period, the digital signal of gathering is carried out analyzing and processing, obtain the measured value and the output of electric field intensity, carry out the field intensity caution in conjunction with national standard simultaneously by single-chip microcomputer; Because single-chip microcomputer adopts the timer mode when warning of controlling filed strong acoustooptic and numerical value demonstration, after finishing, data processing just can carry out the AD conversion of following one-period.The numerical value that obtains is carried out computational analysis, obtain the power-frequency electric field strength of tested point; At last, output shows and warns according to setting numerical value in conjunction with related standards to the electric field intensity that records.
In addition, system can carry out different measurement patterns, and time constant is set to 30S, 1min, 2min and 5min etc. respectively.Obtain mean value, maximal value, the minimum value of the electric field data in the different time respectively, satisfy different measurement of operating personnel and data analysis needs.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (10)
1. electric field measurement system, it is characterized in that: comprise three-dimensional electric field probe (1), Signal Pretreatment unit (2), A/D converting unit (3) and data processing unit (4), described three-dimensional electric field probe (1) comprises three groups of potential electrode, each group potential electrode is the X of corresponding electric field respectively, Y, electric field intensity measuremenrt on the Z direction, described Signal Pretreatment unit (2) comprises three road signal pre-processing circuits, each road signal pre-processing circuit includes pre-amplifying module (21), filtration module (22) and effective value modular converter (23), the signal input part of each road signal pre-processing circuit is connected to the signal output part of corresponding potential electrode respectively, electric field intensity signal after signal pre-processing circuit is handled is sent into data processing unit (4) after changing by A/D converting unit (3), outwards transmission after data processing unit (4) is handled.
2. electric field measurement system according to claim 1, it is characterized in that: described electric field measurement system also comprises wireless transmit/receive units (5), described wireless transmit/receive units (5) comprises with the joining device end module of data processing unit (4) (51) with the joining PC of outer PC holds module (52), and described wireless transmit/receive units (5) is used to realize the real-time Transmission of electric field intensity data and the controlled in wireless between three-dimensional electric field probe and the PC.
3. electric field measurement system according to claim 1 and 2 is characterized in that: described three-dimensional electric field probe (1) adopts cube structure, forms an induction electrode relatively by its pole plate separately between per two corresponding surfaces.
4. electric field measurement system according to claim 3 is characterized in that: described pre-amplifying module (21) and filtration module (22) are formed the active bandwidth-limited circuit of Butterworth second order.
5. electric field measurement system according to claim 4, it is characterized in that: described pre-amplifying module (21) comprises first operational amplifier (U1), the first amplifier resistance (R15), filter capacitor (C40), first stake resistance (R16) and direct earth capacitance (C15), one end of described filter capacitor (C40) is as the filtering input end, the other end inserts the in-phase input end of first operational amplifier (U1), one end of described direct earth capacitance (C15) and filter capacitor (C40) link as an end of filtering input end, other end ground connection, described direct earth capacitance (C15) are connected with the first amplifier resistance (R15) with the common junction of filter capacitor (C40) and are afterwards inserted the output terminal of first operational amplifier (U1); The in-phase input end of one end of described first stake resistance (R16) and first operational amplifier (U1) links, other end ground connection, and inverting input and its output terminal of described first operational amplifier (U1) link.
6. according to claim 4 or 5 described electric field measurement systems, it is characterized in that: described bandpass filtering modules block comprises second operational amplifier (U2), the second amplifier resistance (R22), isolation resistance (R5) and second stake resistance (R20); The inverting input of described second operational amplifier (U2) links by the output terminal of isolation resistance (R5) with first operational amplifier (U1), the described second amplifier resistance (R22) is connected between the inverting input and output terminal of second operational amplifier (U2), and the in-phase input end of described second operational amplifier (U2) is by second stake resistance (R20) ground connection; The output terminal of described second operational amplifier (U2) links by the input end of output resistance (U14) with data processing unit (4).
7. electric field measurement system according to claim 6 is characterized in that: described effective value modular converter (23) comprises real effective conversion chip and peripheral circuit thereof.
8. electric field measurement system according to claim 7 is characterized in that: described real effective conversion chip is AD637.
9. electric field measurement system according to claim 1 is characterized in that: described system also comprises display alarm unit (6), and described display alarm unit (6) links with data processing unit (4).
10. electric field measurement system according to claim 1 is characterized in that: described data processing unit (4) comprises single-chip microcomputer and peripheral circuit thereof.
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| CN2010205037809U CN201892707U (en) | 2010-08-25 | 2010-08-25 | Measuring system for electric field |
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| CN2010205037809U CN201892707U (en) | 2010-08-25 | 2010-08-25 | Measuring system for electric field |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102360042A (en) * | 2011-09-30 | 2012-02-22 | 国网电力科学研究院武汉南瑞有限责任公司 | All-weather power-frequency electric field measuring device |
| CN102692300A (en) * | 2011-12-22 | 2012-09-26 | 河南科技大学 | Leakage-detecting system for houses |
| CN103024970A (en) * | 2011-09-24 | 2013-04-03 | 毛振刚 | Intelligent electricity-saving system for classroom illumination |
| CN103091547A (en) * | 2013-02-04 | 2013-05-08 | 杭州双东电力科技有限公司 | Full voltage class wireless electroscope |
| CN104111383A (en) * | 2014-06-16 | 2014-10-22 | 国家电网公司 | Three-dimensional field intensity detector and method with range finding function |
| CN104833861A (en) * | 2015-04-30 | 2015-08-12 | 江汉大学 | Three-dimensional electric field intensity measuring apparatus |
| CN105572482A (en) * | 2015-12-18 | 2016-05-11 | 国网冀北电力有限公司张家口供电公司 | Enclosed space electric field measurement device |
| CN105629081A (en) * | 2016-03-01 | 2016-06-01 | 成都创为联动科技有限公司 | Method and device for measuring electric field intensity in strong electric field |
| CN106959701A (en) * | 2017-05-03 | 2017-07-18 | 成都大学 | The unmanned plane power-line patrolling system guided based on electric field ranging and Semi-active LASER |
| CN107192896A (en) * | 2017-06-09 | 2017-09-22 | 国网浙江省电力公司杭州供电公司 | Measurement apparatus for High voltage power frequence electric field |
| CN108445306A (en) * | 2018-03-29 | 2018-08-24 | 哈尔滨理工大学 | A kind of electric field measurement system and its application method based on FPGA controls |
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN109884410A (en) * | 2019-03-25 | 2019-06-14 | 安徽大学 | A kind of combination electrode and preparation and the application in electric field detection |
| CN110738820A (en) * | 2019-10-31 | 2020-01-31 | 国网河南省电力公司信息通信公司 | distribution operation field safety early warning circuit |
| CN111207787A (en) * | 2019-12-30 | 2020-05-29 | 国网河南省电力公司郑州供电公司 | High-voltage transmission line construction distance early warning device and method thereof |
| CN112180182A (en) * | 2019-07-03 | 2021-01-05 | 国网福建省电力有限公司建设分公司 | Power frequency electric field measurement system based on Wi-Fi communication |
| CN113933608A (en) * | 2021-11-12 | 2022-01-14 | 国网山东省电力公司高密市供电公司 | Power frequency electric field measurement system and working method |
| CN113992188A (en) * | 2021-11-02 | 2022-01-28 | 中国科学院地质与地球物理研究所 | Electrode impedance matching circuit for measuring earth electric field |
| CN117289040A (en) * | 2023-11-27 | 2023-12-26 | 中国科学院空天信息创新研究院 | Three-dimensional direct current electric field detection device and detection method |
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2010
- 2010-08-25 CN CN2010205037809U patent/CN201892707U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103024970A (en) * | 2011-09-24 | 2013-04-03 | 毛振刚 | Intelligent electricity-saving system for classroom illumination |
| CN102360042A (en) * | 2011-09-30 | 2012-02-22 | 国网电力科学研究院武汉南瑞有限责任公司 | All-weather power-frequency electric field measuring device |
| CN102692300A (en) * | 2011-12-22 | 2012-09-26 | 河南科技大学 | Leakage-detecting system for houses |
| CN102692300B (en) * | 2011-12-22 | 2015-01-07 | 河南科技大学 | Leakage-detecting system for houses |
| CN103091547A (en) * | 2013-02-04 | 2013-05-08 | 杭州双东电力科技有限公司 | Full voltage class wireless electroscope |
| CN104111383A (en) * | 2014-06-16 | 2014-10-22 | 国家电网公司 | Three-dimensional field intensity detector and method with range finding function |
| CN104833861A (en) * | 2015-04-30 | 2015-08-12 | 江汉大学 | Three-dimensional electric field intensity measuring apparatus |
| CN105572482B (en) * | 2015-12-18 | 2020-06-09 | 国网冀北电力有限公司张家口供电公司 | Closed space electric field measuring equipment |
| CN105572482A (en) * | 2015-12-18 | 2016-05-11 | 国网冀北电力有限公司张家口供电公司 | Enclosed space electric field measurement device |
| CN105629081A (en) * | 2016-03-01 | 2016-06-01 | 成都创为联动科技有限公司 | Method and device for measuring electric field intensity in strong electric field |
| CN106959701A (en) * | 2017-05-03 | 2017-07-18 | 成都大学 | The unmanned plane power-line patrolling system guided based on electric field ranging and Semi-active LASER |
| CN107192896A (en) * | 2017-06-09 | 2017-09-22 | 国网浙江省电力公司杭州供电公司 | Measurement apparatus for High voltage power frequence electric field |
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN108445306A (en) * | 2018-03-29 | 2018-08-24 | 哈尔滨理工大学 | A kind of electric field measurement system and its application method based on FPGA controls |
| CN109884410A (en) * | 2019-03-25 | 2019-06-14 | 安徽大学 | A kind of combination electrode and preparation and the application in electric field detection |
| CN109884410B (en) * | 2019-03-25 | 2020-12-25 | 安徽大学 | Composite electrode, preparation and application in electric field detection |
| CN112180182A (en) * | 2019-07-03 | 2021-01-05 | 国网福建省电力有限公司建设分公司 | Power frequency electric field measurement system based on Wi-Fi communication |
| CN110738820A (en) * | 2019-10-31 | 2020-01-31 | 国网河南省电力公司信息通信公司 | distribution operation field safety early warning circuit |
| CN111207787A (en) * | 2019-12-30 | 2020-05-29 | 国网河南省电力公司郑州供电公司 | High-voltage transmission line construction distance early warning device and method thereof |
| CN113992188A (en) * | 2021-11-02 | 2022-01-28 | 中国科学院地质与地球物理研究所 | Electrode impedance matching circuit for measuring earth electric field |
| CN113933608A (en) * | 2021-11-12 | 2022-01-14 | 国网山东省电力公司高密市供电公司 | Power frequency electric field measurement system and working method |
| CN117289040A (en) * | 2023-11-27 | 2023-12-26 | 中国科学院空天信息创新研究院 | Three-dimensional direct current electric field detection device and detection method |
| CN117289040B (en) * | 2023-11-27 | 2024-02-23 | 中国科学院空天信息创新研究院 | Three-dimensional direct current electric field detection device and detection method |
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