CN102645573B - Noncontact ultrahigh voltage electricity detector - Google Patents
Noncontact ultrahigh voltage electricity detector Download PDFInfo
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- CN102645573B CN102645573B CN201210146374.5A CN201210146374A CN102645573B CN 102645573 B CN102645573 B CN 102645573B CN 201210146374 A CN201210146374 A CN 201210146374A CN 102645573 B CN102645573 B CN 102645573B
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Abstract
A noncontact ultrahigh voltage electricity detector comprises an ultrasonic wave receive unit, an electromagnetic signal receive unit, a shielded enclosure and a master control circuit board, wherein the ultrasonic wave receive unit comprises an ultrasonic transducer and a directional ultrasound millimeter wave signal receiver which is of a nonmetal paraboloid structure, and the ultrasonic transducer is installed at the focal position of the directional ultrasound millimeter wave signal receiver through an installation support and is electrically connected with the master control circuit board; the electromagnetic signal receive unit comprises an even number of electromagnetic signal receive antennas which are arranged on the directional ultrasound millimeter wave signal receiver and symmetrically distributed close to the edge of the directional ultrasound millimeter wave signal receiver along the circumference, and the electromagnetic signal receive antennas are electrically connected with the master control circuit board; and the master control circuit board is provided with an ultrasonic signal process module, a multichannel electromagnetic signal process module, a data display module, an audio output module and a process chip. The noncontact ultrahigh voltage electricity detector is combined with signals having different characteristics and forms, thus realizing the location of high voltage equipment electricity detection; and the noncontact ultrahigh voltage electricity detector is good in directivity and high in sensibility.
Description
Technical field
The invention belongs to charging equipment electrical verification technical field in electric system, particularly relate to a kind of noncontact ultrahigh voltage electricity detector of charging equipment being carried out to electrical verification detection combined based on ultrasound wave and electromagnetic induction.
Background technology
High-voltage electric power circuit is the lifeblood of national economy, in the electric system of actual motion alive circuit and charging equipment ubiquitous, must identify electrified body and locate before the detection of staff's conducting transmission line and equipment, determining that circuit just can carry out service work after not charged, thus guarantee personal safety and ensure the normal operation of electric system.Electroscope to be used to detect on power equipment whether one of common tool that there is voltage, UHV (ultra-high voltage) electrified body identification both at home and abroad and location technology can be divided into two large classes by electrical verification mode at present: a class is the identification of contact electrified body and location technology, and another kind of is the identification of contactless inspection electrified body and location technology.Wherein, contact electroscope is existing practical application in electric system, and existing relevant criterion has carried out specification to the galvanoscopic design of contact, maker test method; And contactless electroscope is also in development and experimental stage at present.
Existing contact electroscope mainly contains high-tension electricity condensing type electroscope, sparking distance method electroscope, divider resistance formula electroscope etc.Because contact electroscope directly must contact with high-tension apparatus when electrical verification operates, therefore there is control lever long, not Portable belt, not easy-operating shortcoming, especially in supertension line and equipment occasion, safe distance is far away, insulating requirements is high, insulation conditions can not be guaranteed when electric pressure is high, there is certain potential safety hazard, easily affect personal safety, cause unnecessary economic loss and casualties; Simultaneously along with the maturation of UHV (ultra-high voltage), UHV transmission technology, the electric pressure of transmission line of electricity is more and more higher, according to the regulation of ultra-high-tension power transmission line terrain clearance, in general line voltage distribution higher grade, line security required distance is higher, the length of general electricity testing rod and amount of deflection are difficult to meet the demands, and bring inconvenience to the galvanoscopic operation of contact.
In view of contact is galvanoscopic above not enough, non-contact type electricity checking device receives to be paid close attention to widely, existing contactless electrified body identification and location technology mainly utilize the method for electromagnetic induction, High voltage power frequence electric field signal intensity is measured, by electromagnetic theory result of calculation, thus detect the voltage of electrified body and charged identification.If the patent No. is the Chinese utility model patent of 200720125147.9, the Chinese utility model patent that the patent No. is 201020170413.1 and the patent No. are several extra-high voltage electricity equipment disclosed in the Chinese utility model patent of 201120035590.3, mainly comprise Ultraviolet sensor circuit, photoelectric isolating circuit, microprocessor, humiture collection circuit, touch control circuit, the indicating circuit that the output terminal of microprocessor is connected, the memory expansion circuit be connected with microprocessor and respectively with Ultraviolet sensor circuit, photoelectric isolating circuit, microprocessor, humiture collection circuit, the power circuit that touch control circuit is connected, Ultraviolet sensor circuit is connected with the input end of microprocessor by photoelectric isolating circuit, and the output terminal of humiture collection circuit, the output terminal of touch control circuit are connected with the input end of microprocessor.Obtained the discharge signal of the high-pressure system in coverage by ultraviolet transducing circuit, transfer to processor and carry out signal transacting, then by processor statistics discharge pulse numerical value, electrical verification detection is carried out to electrical equipment.Although above-mentioned several non-contact type electricity checking device can effectively avoid personal safety accident, guarantee power system security is produced, the shortcoming that but ubiquity electrical verification result repeatability is bad, reliability is not high, directivity is poor, which phase circuit or equipment live the scene of being difficult to accurately judges, cannot effectively realize accurate location.
Summary of the invention
The object of this invention is to provide a kind of good directionality, highly sensitive, can the non-contact type ultrasonic electroscopic device of the accurate particular location of positioning belt electric line or equipment.
To achieve these goals, the present invention takes following technical solution:
Noncontact ultrahigh voltage electricity, comprising: ultrasonic wave receive unit, electromagnetic signal receiving element, metal screen case and the main control board be arranged in described shield shell; Ultrasonic wave receive unit comprises ultrasonic transducer and is arranged at the directional ultrasound millimeter-wave signal receiving body of shield shell front end, this directional ultrasound millimeter-wave signal receiving body is the parabolic configuration that nonmetallic materials are made, ultrasonic transducer is arranged on the focal position of directional ultrasound millimeter-wave signal receiving body by mounting bracket, and ultrasonic transducer is electrically connected with main control board; Electromagnetic signal receiving element comprises even number and is arranged at electromagnetic signal receiving antenna in directional ultrasound millimeter-wave signal receiving body and circumferentially symmetrical near directional ultrasound millimeter-wave signal receiving body edge, and electromagnetic signal receiving element is electrically connected with main control board; The process chip that main control board is provided with the ultrasonic signal processing module be connected with ultrasonic wave receive unit, the multi-channel electromagnetic signal processing module be connected with electromagnetic signal receiving element, data disaply moudle, dio Output Modules and is connected with dio Output Modules with ultrasonic signal processing module, electromagnetic signal processing module, data disaply moudle respectively; Process chip carries out the narrow-band filtering process of sample conversion laggard line number word and digital signal feature extraction and judgement to the ultrasonic signal being received from ultrasonic signal processing module and the electromagnetic signal that is received from multi-channel electromagnetic signal processing module, and symmetric channel difference processing and positions calculations are carried out to electromagnetic signal, result is sent to data disaply moudle and dio Output Modules output.
Ultrasonic signal processing module of the present invention comprises the ultrasound wave filtering circuit, ultrasonic amplifying circuit, ultrasound wave frequency conversion demodulator circuit and the ultrasound wave envelope detection circuit that are connected successively, and the ultrasonic signal for receiving carries out filtering, amplification, frequency conversion demodulation and detection process.
Multi-channel electromagnetic signal processing module of the present invention comprises connected electromagnetic wave filtering circuit corresponding to described electromagnetic signal receiving antenna and electromagnetic wave amplifies and detecting circuit, and the electromagnetic wave signal for receiving carries out filtering, amplification and detection process.
Dio Output Modules of the present invention comprises the D/A modular converter and drive amplification circuit that are connected successively.
Electromagnetic signal receiving antenna of the present invention is double-deck PBC structure.
The present invention is provided with optical foresight at described shield shell top.
The present invention is processed with observation port in described directional ultrasound millimeter-wave signal receiving body, and described observation port is positioned on the horizontal optical axis of described optical foresight.
The present invention adopts ultrasound wave to detect with electromagnetic signal the mode combined, directive reception is carried out to the ultrasonic signal of supertension line corona discharge radiation and ELECTROMAGNETIC RADIATION SIGNATURE, the ultrasonic signal received is carried out to envelope detection process and carry out the extraction of power frequency component frequecy characteristic to the envelope signal after detection in back-end chip processing procedure, by showing and monitoring the charged situation that power frequency component image and sound judge charging equipment, avoid in conventional ultrasound wave detecting method directly to the erroneous judgement that the ultrasonic signal received is sampled and monitored and may cause, thus improve the accuracy of electrical verification, adopt the receiving element of multi-channel electromagnetic signal receiving antenna composition simultaneously, the multiple signals received are carried out difference processing, device under test level and vertical position position, thus the electrical verification realizing high voltage alive equipment detects, certain uniline that accurately location is specifically charged.The present invention takes full advantage of the highly sensitive feature of the strong and electromagnetic signal of ultrasound examination good directionality, anti-electromagnetic interference capability, adopts non-contacting mode to detect, can operate at a distance, can guarantee the safety of operator.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is schematic block circuit diagram of the present invention;
Fig. 4 is that electrical verification of the present invention detects schematic diagram;
Fig. 5 is the schematic diagram of the embodiment of the present invention 3;
Fig. 6 is the schematic diagram of the embodiment of the present invention 4.
Below in conjunction with accompanying drawing and each embodiment, the present invention is described in more detail.
Embodiment
Embodiment 1
As shown in Figure 1, the UHV (ultra-high voltage) electroscopic device of the present embodiment comprises ultrasonic wave receive unit 1, electromagnetic signal receiving element 2, shield shell 3, handle 4 and optical foresight 5.Wherein, ultrasonic wave receive unit 1 comprises ultrasonic transducer 1a, directional ultrasound millimeter-wave signal receiving body 1b and mounting bracket 1c.
Shield shell 3 is round metal tubular hollow structure, is provided with main control board in shield shell 3, and shield shell 3 can shield electromagnetic signal.Ultrasonic wave receive unit 1 is arranged at the front portion of shield shell 3, and handle 4 is arranged at the rear portion of shield shell 3, and with handled easily, personnel are hand-held.Directional ultrasound millimeter-wave signal receiving body 1b is fixedly mounted on shield shell 3 front end, directional ultrasound millimeter-wave signal receiving body 1b of the present invention is made up of nonmetallic materials, as organic glass, rigid plastic etc., directional ultrasound millimeter-wave signal receiving body 1b is parabolic shape.Ultrasonic transducer 1a is arranged on the focal position of directional ultrasound millimeter-wave signal receiving body 1b by mounting bracket 1c, and ultrasonic transducer 1a is electrically connected with the main control board be installed in shield shell 3.Ultrasonic millimeter-wave signal receiving body 1b of the present invention adopts parabolic shape, can will arrive the ultrasonic millimeter-wave signal reflect focalization of its reflecting surface on ultrasonic transducer 1a, strengthen the signal intensity that ultrasonic transducer 1a receives, thus increase the detection sensitivity of ultrasonic signal.Simultaneously with reference to Fig. 2, electromagnetic signal receiving element 2 of the present invention is made up of the electromagnetic signal receiving antenna of even number rectangle, and the electromagnetic signal receiving antenna of the present embodiment is the pcb board that one side covers copper, and pcb board can adopt glass mat to make.On directional ultrasound millimeter-wave signal receiving body 1b, 4 circumferentially symmetrical electromagnetic signal receiving antennas are provided with near its marginal position in the present embodiment, because directional ultrasound millimeter-wave signal receiving body 1b of the present invention is that nonmetallic materials are made, therefore, on electromagnetic signal receiving element 2 madial wall that directly can be arranged at directional ultrasound millimeter-wave signal receiving body 1b or lateral wall, in the present embodiment, electromagnetic signal receiving antenna is installed on the madial wall of directional ultrasound millimeter-wave signal receiving body 1b.Electromagnetic signal receiving element 2 is electrically connected with main control board.Electromagnetic signal receiving antenna is adopted arrangement symmetrical up and down, thus utilizes electromagnetic signal to realize the detection and location of electrified body.
As preferred embodiment, shield shell 3 top is provided with optical foresight 5, directional ultrasound millimeter-wave signal receiving body 1b is processed with observation port a, and observation port a is positioned on the horizontal optical axis of optical foresight 5.Adopt optical aiming device, by light auxiliary positioning, electrical verification detect time operating personnel can in safe distance scope more adequately positioning belt electricity body, avoid contacting with high-tension apparatus, security is high.In addition, when directional ultrasound millimeter-wave signal receiving body 1b adopts transparent nonmetallic materials to make, directional ultrasound millimeter-wave signal receiving body 1b then need not arrange observation port a, and optical foresight 5 directly can carry out observation location through directional ultrasound millimeter-wave signal receiving body 1b.
As shown in Figure 3, main control board of the present invention is provided with ultrasonic signal processing module A, multi-channel electromagnetic signal processing module B, process chip C, data disaply moudle D and dio Output Modules E, process chip C is connected with ultrasonic signal processing module A, multi-channel electromagnetic signal processing module B, data disaply moudle D and dio Output Modules E respectively, and in the present embodiment, the model of process chip C is C8051F021.Ultrasonic signal processing module A comprises the ultrasound wave filtering circuit, ultrasonic amplifying circuit, ultrasound wave frequency conversion demodulator circuit and the ultrasound wave envelope detection circuit that connect successively, after ultrasonic transducer 1a receives ultrasonic millimeter-wave signal, signal is sent in ultrasonic signal processing module A, carry out frequency conversion demodulation and envelope detection process by ultrasonic signal processing module A to after ultrasonic millimeter-wave signal filter and amplification, be then sent to process chip C.Multi-channel electromagnetic signal processing module B comprises electromagnetic wave filtering circuit and electromagnetic wave amplifies and detecting circuit, the present invention is provided with multiple electromagnetic signal receiving antenna, each electromagnetic signal receiving antenna amplifies with a road electromagnetic wave filtering circuit and electromagnetic wave separately and is connected with detecting circuit, electromagnetic wave signal from multi-channel electromagnetic signal receiving antenna is carried out filtering, amplification and detection process by multi-channel electromagnetic signal processing module B, is then sent to process chip C.Electromagnetic signal of the present invention adopts multi-channel electromagnetic signal receiving antenna to receive, and can realize the accurate location of live high voltage equipment.Process chip C carries out A/D sample conversion to the ultrasonic signal received and electromagnetic signal, extracts the effective information of electrical verification signal, and carries out difference processing positions calculations to multi-channel electromagnetic signal.Result is sent to data disaply moudle D by process chip C, is shown by data disaply moudle D, and the model of the data disaply moudle of the present embodiment is DM100X; Result is also exported by dio Output Modules E simultaneously, and the dio Output Modules E of the present embodiment comprises the D/A modular converter and drive amplification circuit that connect successively, and result is formed audio frequency after being amplified with rear end by D/A conversion and exports.
The ultimate principle of ultrasonic wave electrified body identification of the present invention and location technology is: detect high-tension line or the whether charged ultrasonic signal by producing during the corona discharge that detects on high-tension line of equipment and charged time ELECTROMAGNETIC RADIATION SIGNATURE carry out, first ultrasonic wave receive unit and the electromagnetic signal receiving element that is made up of multi-channel electromagnetic signal receiving antenna received ultrasonic signal and electromagnetic signal respectively, then the signal received is sent to respective signal processing module, first corresponding signal processing module carries out filtering process all respectively to ultrasonic signal and electromagnetic signal, then ultrasonic signal is amplified, frequency conversion demodulation and envelope detection process, amplification demodulator process is carried out to electromagnetic signal, ultrasonic signal after process is sent to process chip together with electromagnetic signal, the A/D modular converter of process chip inside carries out sample conversion to ultrasonic signal and electromagnetic signal and becomes digital signal, then digital narrowband filtering process is carried out to the ultrasonic signal after conversion and electromagnetic signal, to strengthen the interference free performance of electroscopic device, ensure the accuracy of electrical verification, then Digital Signal Processing is adopted to carry out the extraction of power frequency characteristic frequency to digital ultrasonic signal and electromagnetic signal respectively, judge that whether signal is the ultrasonic signal that produces of electrified body and electromagnetic signal, symmetric channel difference processing is carried out to multi-channel electromagnetic signal simultaneously, judge whether directional ultrasound millimeter-wave signal receiving body aims at tested electrified body, thus determine the charged situation of Devices to test and horizontal and vertical direction, then result is exported respectively by image and audio frequency, obtain electrified body identification and positioning result.The present invention, in conjunction with heterogeneity, multi-form signal, realizes the accurate location of high-tension line and equipment electrical verification.
As shown in Figure 4, in reality detects, electroscopic device is aimed at the ultrahigh-voltage electric power circuit needing to detect or equipment, utilize earphone and display to monitor, observe electric discharge and the electromagnetic signal of the corona whether having high pressure to produce, when display be the corona rectified signal simultaneously monitored of power frequency characteristic signal also for power frequency characteristic sounds time, then illustrate that circuit is charged; Mobile electroscopic device to sound maximum and observe the strongest circuit of indicator signal then for detect circuit; In addition, when the present invention is in conjunction with optical aiming device, the respective lines detected can more accurately be determined through observation port.This method fully combines the high sensitivity that the highly directive of ultrasonic millimeter wave detecting device and electromagnetic signal detect, and devises good directionality, highly sensitive electroscope, can the particular location of accurate positioning belt electric line.
Embodiment 2
The present embodiment place different from embodiment 1 is: the electromagnetic signal receiving antenna in the electromagnetic signal receiving element of the present embodiment is the double-decker covering copper on the two sides of pcb board.Adopt double-deck receiving antenna to be more conducive to the stable of space-reception signal, the electromagnetic signal that receiving antenna receives is carried out differential type process by hyperchannel and compared again, thus the location in the collection of letters horizontal and vertical direction that achieves a butt joint.
Embodiment 3
As shown in Figure 5, the present embodiment place different from embodiment 1 is: the electromagnetic signal receiving element 2 of the present embodiment includes 2 circumferentially symmetrical electromagnetic signal receiving antennas be arranged at directional ultrasound millimeter-wave signal receiving body 1b upper marginal position, and the shape of this electromagnetic signal receiving antenna is round sheet.
Embodiment 4
As shown in Figure 6, the place that the present embodiment is different from embodiment 1 is: the electromagnetic signal receiving element 2 of the present embodiment includes 8 circumferentially symmetrical electromagnetic signal receiving antennas be arranged at intervals at directional ultrasound millimeter-wave signal receiving body 1b upper marginal position.
The present invention can be used for exchanging the detection, display, warning etc. of the electrified body voltages such as supply line that 50Hz rated voltage is 220KV-1000KV, high-tension apparatus and high-pressure test device, has the following advantages compared with existing high voltage electroscope:
Can be whether charged apart from outer non-contact testing measured object at electrical safety, good directionality, the degree of discrimination is high, avoids contacting with high-tension apparatus, and security is high.
Adopt directional ultrasound wave transducer and multi-channel electromagnetic signal receiving unit, by ultrasound wave passage and electromagnetism hyperchannel, signal is carried out to filtering and signal characteristic abstraction filtering interfering, extracts the effective information of electrical verification signal, realizes multiple signals positions calculations, difference processing and compare, realize the accurate location of circuit under test or equipment level and vertical direction.
Directional ultrasound millimeter-wave signal receiving body adopts nonmetallic materials, lightweight, is easy to carry.
Structural design convenient operation, handle design hommization, easy to use and carry.
Operation can be carried out on ground, greatly alleviates the labour intensity of high voltage line maintenance, saves labor, and improves the work efficiency of electric power overhaul.
Claims (5)
1. noncontact ultrahigh voltage electricity detector, comprising: the shield shell of ultrasonic wave receive unit, electromagnetic signal receiving element, metal and the main control board be arranged in described shield shell; It is characterized in that:
Described ultrasonic wave receive unit comprises ultrasonic transducer and is arranged at the directional ultrasound millimeter-wave signal receiving body of described shield shell front end, described directional ultrasound millimeter-wave signal receiving body is the parabolic configuration that nonmetallic materials are made, described ultrasonic transducer is arranged on the focal position of described directional ultrasound millimeter-wave signal receiving body by mounting bracket, and described ultrasonic transducer is electrically connected with described main control board;
Described electromagnetic signal receiving element comprises even number and is arranged at intervals at the electromagnetic signal receiving antenna also circumferentially distributed symmetrically in described directional ultrasound millimeter-wave signal receiving body and near described directional ultrasound millimeter-wave signal receiving body edge, described electromagnetic signal receiving antenna adopts arrangement symmetrical up and down, and described electromagnetic signal receiving element is electrically connected with described main control board;
The process chip that described main control board is provided with the ultrasonic signal processing module be connected with ultrasonic wave receive unit, the multi-channel electromagnetic signal processing module be connected with electromagnetic signal receiving element, data disaply moudle, dio Output Modules and is connected with dio Output Modules with described ultrasonic signal processing module, multi-channel electromagnetic signal processing module, data disaply moudle respectively;
After ultrasonic transducer receives ultrasonic millimeter-wave signal, signal is sent in described ultrasonic signal processing module, described ultrasonic signal processing module comprises the ultrasound wave filtering circuit, ultrasonic amplifying circuit, ultrasound wave frequency conversion demodulator circuit and the ultrasound wave envelope detection circuit that connect successively, and the signal for receiving carries out filtering, amplification, frequency conversion demodulation and envelope detection process; Described multi-channel electromagnetic signal processing module comprises connected electromagnetic wave filtering circuit corresponding to described electromagnetic signal receiving antenna and electromagnetic wave amplifies and detecting circuit, and the electromagnetic wave signal for receiving carries out filtering, amplification and detection process; Described process chip comprises A/D sample conversion module, narrow-band filtering module, characteristic extracting module and differential processing module, process chip carries out the narrow-band filtering process of sample conversion laggard line number word and digital signal feature extraction and judgement to the ultrasonic signal being received from ultrasonic signal processing module and the electromagnetic signal that is received from multi-channel electromagnetic signal processing module, and symmetric channel difference processing and positions calculations are carried out to electromagnetic signal, result is sent to data disaply moudle and dio Output Modules output.
2. noncontact ultrahigh voltage electricity detector according to claim 1, is characterized in that: described dio Output Modules comprises the D/A modular converter and drive amplification circuit that connect successively.
3. noncontact ultrahigh voltage electricity detector according to claim 1, is characterized in that: described electromagnetic signal receiving antenna is double-deck PCB structure.
4. noncontact ultrahigh voltage electricity detector according to claim 1, is characterized in that: described shield shell top is provided with optical foresight.
5. noncontact ultrahigh voltage electricity detector according to claim 4, is characterized in that: in described directional ultrasound millimeter-wave signal receiving body, be processed with observation port, described observation port is positioned on the horizontal optical axis of described optical foresight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210146374.5A CN102645573B (en) | 2012-05-11 | 2012-05-11 | Noncontact ultrahigh voltage electricity detector |
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| CN201210146374.5A CN102645573B (en) | 2012-05-11 | 2012-05-11 | Noncontact ultrahigh voltage electricity detector |
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| CN102645573A CN102645573A (en) | 2012-08-22 |
| CN102645573B true CN102645573B (en) | 2015-05-13 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103344818B (en) * | 2013-06-19 | 2015-11-18 | 国家电网公司 | Non-contact type electricity checking device and electricity-testing method |
| CN106645891A (en) * | 2016-11-16 | 2017-05-10 | 合肥普望电子有限责任公司 | Power grid high-voltage line live part verification method |
| CN106645890A (en) * | 2016-11-16 | 2017-05-10 | 合肥普望电子有限责任公司 | High voltage electroscopic system |
| CN106370728A (en) * | 2016-12-02 | 2017-02-01 | 河南宏博测控技术有限公司 | Power grid fault ultrasonic testing device and method |
| CN108169542B (en) * | 2018-01-10 | 2020-03-31 | 云南电网有限责任公司电力科学研究院 | Non-contact electricity testing device |
| CN111025006B (en) * | 2019-12-20 | 2021-04-16 | 云南电网有限责任公司玉溪供电局 | Non-contact voltage detection and phase recognition device |
| CN113945812B (en) * | 2021-09-28 | 2023-04-07 | 海南电网有限责任公司电力科学研究院 | Near-field space pulse radiation positioning sensor |
| CN115032468B (en) * | 2022-08-10 | 2022-10-21 | 广东电网有限责任公司佛山供电局 | Device and method for identifying direction of charged body |
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