CN101487858A - 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus - Google Patents
1000kV extra-high voltage AC non-contact type electricity checking method and apparatus Download PDFInfo
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Abstract
The invention provides a 1000kV ultrahigh voltage alternating current non-contact-type electroscopy and an electroscope thereof, the hardware part of the electroscope consists of a signal acquisition module, a signal amplification module, a signal processing module, an analog-to-digital conversion and data processing module and an alarm module, the software part thereof is divided into five stages comprising self-check, pre-check, checkup, comparison and alarm; after the self-check is passed and time delay of 3 seconds elapses, a value, which is obtained by performing a data acquisition in 10KHz frequency on the electric field intensity of the working location, is regarded as a reference value for the electroscopy, the inventive reference value is an electric field value of the on-site working location, which effectively enhances the use range and accuracy of the electroscope; the invention implements the electroscopy in terms of field intensity curves of space electric fields and gives a reflection of the size of the electric field via the frequency velocity of acoustic, optical signals for the alarm, which effectually eradicates the interferences from adjacent charged equipment and settles the difficult problem of inferior repetitiveness and low accuracy of the electroscopy result which is resulted from the interference with the space field intensity by charged bodies of the adjacent measured equipment.
Description
Technical field
The invention belongs to 1000kV ultra-high voltage AC input transformation device managing security tools and instruments, be specifically related to a kind of 1000kV extra-high voltage AC non-contact type electricity checking method and electroscope thereof.
Background technology
Operating maintenance work is the important means of grasping grid equipment ruuning situation, discovery in time and treatment facility defective." State Grid Corporation of China's electric power safety working regulation (power circuit part) " clearly stipulated: on the electrical equipment that part has a power failure, work or dead line job site attaching ground wire before, first electrical verification, the true no-voltage of identification equipment or circuit.Electroscope promptly is to be used for detecting whether have one of common tool of voltage on the power equipment, clearly verify by no-voltage whether really on the maintenance equipment by electroscope, carry out other operations again, in case charged attaching ground wire (splice grafting ground disconnecting link) appears, mistake is bumped the generation of serious accidents such as electric equipment.
China's height/extra high voltage network all is to use the contact electroscope to carry out electrical verification at present, and existing relevant criterion (IEC61243-1 " hot line job is used to exchange the capacitor type electroscope of 1kV and above voltage with electroscope ", DL740-2000 " capacitive character electroscope ") has been carried out standard to the galvanoscopic design of contact, manufacturing, operation guide rule and test method.But the transmission of electricity of extra-high voltage AC/DC is attached most importance to build at present in China, under the background of the reinforcement national grid of electric network coordination at different levels development, existing electrical verification technology and product can't satisfy the demand of extra-high voltage AC/DC project of transmitting and converting electricity repair and maintenance.
1000kV ultra-high voltage AC input transformation engineering has high and high two basic characteristics of operational factor of device structure parameter.If still use the contact electroscope to carry out electrical verification because shaft tower height, the tower head size of 1000kV ultrahigh voltage alternating current transmission lines are big, insulator chain is long, then because phase-ground distance is big, require insulating bar to have long length, the weight of control lever is big so on the one hand, can greatly increase operating personnel's labour intensity; The long on the other hand easy deflection of insulating bar is not easy to operation, adds the factor of work high above the ground, even the electrical verification operation can't be realized.In addition, the working voltage of ultra-high voltage AC input transformation engineering is 1000kV, and all at height/ehv power transmission engineering, its highest suitable voltage can't satisfy the needs of extra-high voltage engineering to existing electroscope; And, galvanoscopic antijamming capability and reliability correspondingly there is higher requirement because the space field intensity around the equipment is higher.
It is pointed out that when DL740-2000 " capacitor type electroscope " only is applicable to operation and the contacted capacitor type electroscope of equipment under test, and be not suitable for the non-contact type electricity checking device of induction type.Therefore, in the development of 1000kV ultra-high voltage AC input transformation engineering non-contact type electricity checking device, not having ready-made standards and norms can be for using for reference, can only be on the basis of the domestic and international various electroscope achievements in research of investigation (comprising principle, technical standard, use experience etc.), according to the handling characteristics of non-contact type electricity checking device, its principle, function and technical conditions etc. are designed and develop.
The data of collecting is carried out Macro or mass analysis, and existing height/UHV (ultra-high voltage) electroscope can be divided into contact and contactless two kinds by the electrical verification mode.The capacitance partial pressure principle that the contact electroscope is based on mostly realizes electrical verification.And contactless electroscope also is in development and experimental stage at present, and it mainly is that associated arguments by near electric field the charging equipment or equipment generation shelf depreciation the time detects and realizes electroscope function.Wherein the former has practical application in electric system; The latter is then also in research, experimental stage, also do not have can practicability product.
In sum, at present also there are not standards and norms can directly instruct the development of 1000kV ultra-high voltage AC input transformation engineering non-contact type electricity checking device, and noncontact electrical verification technology and device also are in the development stage both at home and abroad, therefore need be on the electrical verification technical research achievement basis of the various principles of Macro or mass analysis, carry out autonomous innovation, development is applicable to the non-contact type electricity checking device of 1000kV ultra-high voltage AC input transformation engineering.
A kind of 1000kV extra-high voltage AC non-contact type electricity checking method of the present invention and electroscope thereof, simple to operate, accurate, reliable, pass through the Department of Science and Technology of State Grid Corporation of China on October 13rd, 2008 and held the examination of ultra-high voltage AC transmission engineering gordian technique research topic examination meeting in Wuhan, and worked out " 1000kV extra-high voltage AC non-contact type electricity checking device " and " 1000kV extra-high voltage AC non-contact type electricity checking device preventive trial rules " technical standard draft.Before this, the relevant report of like product is never arranged.
Summary of the invention
The purpose of this invention is to provide a kind of 1000kV extra-high voltage AC non-contact type electricity checking method and electroscope thereof; adopt the inductive electromagnetic method of capacitance induction principle to come electrical verification; being used for 1000KV ultra-high voltage AC input transformation line project, whether have electricity, play the safeguard protection effect if measuring power transmission and transformation line.
In order to achieve the above object, technical scheme of the present invention is: 1000kV extra-high voltage AC non-contact type electricity checking device electricity-testing method is characterized in that: comprise self check, preliminary examination, detection, comparison and report to the police five stages; After self check is passed through,, carry out value that the electric field intensity of this working position of data acquisition obtains reference value as electrical verification with certain frequency through time-delay; Field intensity curve and variation tendency according to space electric field are come electrical verification, reflect the size of electric field by the sound and optic signal frequency speed of reporting to the police.
Adopt the 1000kV extra-high voltage AC non-contact type electricity checking device of said method, it is characterized in that:
Comprise signal acquisition module, signal amplification module, signal processing module, alarm module and analog to digital conversion and data processing module, the voltage signal of the extra-high voltage that signal acquisition module collects amplifies through the signal amplification module, handles through signal processing module again; Data processing module carries out value that the electric field intensity of this working position of data acquisition the obtains reference value as electrical verification with certain frequency, comes electrical verification according to the field intensity curve and the variation tendency of space electric field; After the signal that analog to digital conversion and data processing module transmit signal processing module carried out data processing, the interlink warning module was made mutually at the sound, visual alarm.
Principle of work of the present invention is: existing different electric pressure electroscopes, and corresponding electrical verification reference value is changeless, and electrical verification reference value of the present invention is variable.The reference value of electrical verification is after self check is passed through, and through time-delay, carries out the value that the electric field intensity of this working position of data acquisition obtains with certain frequency.Because power transmission and transforming equipment site environment complexity, electric field change is irregular, and the electric field value that electrical verification reference value of the present invention is the work on the spot position has improved galvanoscopic usable range and accuracy effectively, and the operating personnel all can measure on ground and tower.
Existing different electric pressure electroscope, corresponding electrical verification alarming threshold value is changeless.The present invention comes electrical verification according to the field intensity curve of space electric field and variation tendency, has carried out repeatedly site test in 1000kV extra-high-voltage alternating current test base.The sound and optic signal frequency speed of reporting to the police by the present invention reflects the size and the variation tendency of electric field, and the sound and optic signal frequency is fast, then represents the electric-field strength of position of the present invention than the reference position, i.e. the operational outfit that the present invention surveyed is charged.Because the present invention comes electrical verification according to the field intensity curve and the variation tendency of space electric field, got rid of the interference of contiguous charging equipment effectively, the electrified body that has solved contiguous equipment under test causes the electrical verification difficult problem that repeatability is bad as a result, accuracy is not high to the interference of space field intensity.
The invention has the beneficial effects as follows: satisfied China and exchanged 1000kV UHV transmission line engineer operation security protection requirement, fill up the blank of China on 1000kV extra-high voltage electric transmission and transformation device security Work tool, be applicable to 1000kV extra-high voltage electric transmission and transformation line data-logging.
Description of drawings
Fig. 1 is an embodiment of the invention hardware system block scheme.
Fig. 2 is the signal acquisition module schematic diagram among Fig. 1.
Fig. 3 is the signal amplification module schematic diagram among Fig. 1.
Fig. 4 is a rectification circuit schematic diagram in the signal processing module among Fig. 1.
Fig. 5 is analog to digital conversion and the data processing module peripheral circuit diagram among Fig. 1.
Fig. 6 is an embodiment of the invention software programming process flow diagram.
Specific embodiments
Below in conjunction with drawings and Examples 1000kV extra-high voltage AC non-contact type electricity checking method of the present invention and electroscope thereof are described further:
Description of symbols among Fig. 1: 1-signal acquisition module, 2-signal amplification module, 3-signal processing module, 4-analog to digital conversion and data processing module, 5-alarm module, 6-self-test signal.
Mark among Fig. 3: 7-differential input stage, 8-voltage amplifier stage, 9-output stage, 10-biasing circuit.
Description of symbols among Fig. 6: 11-self check, 12-preliminary examination, 13-detect, 14-relatively, 15-sound and light alarm, 16-electricity is arranged, 17-nothing is electric, 18-cycle detection.
Fig. 1 is an embodiment of the invention hardware system block scheme, 1000kV extra-high voltage AC non-contact type electricity checking device provided by the invention is made up of signal acquisition module 1, signal amplification module 2, signal processing module 3, analog to digital conversion and data processing module 4 and alarm module 5.The voltage signal of the extra-high voltage that signal acquisition module 1 collects, amplify through signal amplification module 2, again after signal processing module 3 filtering, rectification etc. are handled, delivering to analog to digital conversion and data processing module 4 carries out analog to digital conversion, becomes the digital signal line data of going forward side by side and handle, judged whether electricity according to the data after handling, then interlink warning module 5 make mutually at the sound, visual alarm.
As shown in Figure 2, signal acquisition module 1 designs according to electromagnetic induction principle collection voltage signal; Can calculate the electric field intensity of electroscope space environment of living in by the pressure drop at measuring resistance R two ends.
As shown in Figure 3, signal amplification module 2 has adopted the operational amplification circuit that differential signal is amplified to suppress common mode interference signal; The differential type amplifying circuit that input stage generally is made up of BJT, JFET or MOSFET among Fig. 3 utilizes its symmetry characteristic can improve the common-mode rejection ratio of entire circuit, and its two input ends constitute the inverting input and the in-phase input end of entire circuit.The main effect of voltage amplifier stage 8 is to improve voltage gain, and it can be made up of one or more levels amplifying circuit.Output stage 9 generally is made up of voltage follower or complementary voltage follower, to reduce output resistance, improves carrying load ability.Biasing circuit 10 is to provide suitable working current at different levels.Also have some auxiliary links in addition, as level shift circuit, overload protecting circuit and high-frequency compensation link etc.
As shown in Figure 5, analog to digital conversion and data processing module 4 are made of single-chip microcomputer, effect is that the DC simulation conversion of signals is become digital signal, after digital filtering and data computation Intelligent treatment, judges whether that according to the data that obtain out-of-limit back sends action command to alarm module 5; Alarm module 5 comprises hummer sounding alarm and pilot lamp warning, carries out relevant action according to the instruction that receives.Single-chip microcomputer C8051F330 mainly realizes following function:
(a) control multiway analog switch CD4053;
(b) finish analog to digital conversion;
(c) carry out data processing;
(d) control hummer and alarm lamp;
Therefore, the peripheral interface design of the C8051F330 that relates to is as follows:
(a) P0.0 inserts the output terminal of signal processing module 3;
(b) buzzer siren in the P0.2 module 5 taking alarm;
(c) alarm lamp in the P0.3 module 5 taking alarm;
(d) P0.5, P0.6 and P0.7 are used to control multiway analog switch chip CD4053, and three LED light of corresponding simultaneously control are used for showing current galvanoscopic state;
(e) C2D and C2CK all debug the connector of (JTAG) as online programming.
Electroscope is in case start promptly enters the self check link automatically, the control signal control analog switch CD4053 that single-chip microcomputer (being analog to digital conversion and data processing module 4) provides, with self-test signal gating input signal treatment channel, behind signal amplification module 2, signal processing module 3, can in single-chip microcomputer, detect the self check output signal.For the self check of power unit function, then adopt power light to detect and realize whether indication working properly.Can't operate as normal when power unit, then this pilot lamp does not work; If working properly at power unit, then enter the self check link, above-mentioned self check process relates to whole galvanoscopic each functional module, and whether the size by measuring the self check output signal is can decision circuitry working properly.
Fig. 6 is an embodiment of the invention software programming process flow diagram, it is characterized in that: 1000kV extra-high voltage AC non-contact type electricity checking device electricity-testing method is divided into self check 11, preliminary examination 12, detection 13, comparison 14,15 5 stages of sound and light alarm, mainly be that single-chip microcomputer in analog to digital conversion and the data processing module 4 is programmed, make it have powerful data computation Intelligent treatment function.
The reference value of embodiment of the invention electrical verification is variable, enter the working position, press reset key, after self check is passed through, carry out preliminary examination: through time-delay (3S), promptly carry out electric field measurement work, (10KHz) carries out data acquisition with certain frequency, and write down the electric field intensity of this working position, as the reference value of electrical verification.Judge according to the variation tendency of electric field whether equipment under test is charged.
The embodiment of the invention has been carried out repeatedly site test in 1000kV extra-high-voltage alternating current test base, variation tendency according to electric field, rationally chosen the electrical verification alarming threshold value, and be provided with a plurality of alarming values on this basis, the size that reflects electric field by the sound and optic signal frequency speed of the present invention's warning, the sound and optic signal frequency is fast, then represents the electric-field strength of position of the present invention than the reference position, i.e. the operational outfit that the present invention surveyed is charged.
The working specification of the embodiment of the invention:
(1) before using 1000kV extra-high voltage AC non-contact type electricity checking device, must check electroscope.If find that electroscope exists crackle, each parts that not fastening, control lever is installed and is connected phenomenon such as unreliable with electroscope and must not uses.
(2) have only the electroscope that has passed through self check just can be used for the electrical verification operation.Whether the electroscope self check is by judging according to following phenomenon:
(a) turn on the power switch, power light (green light) is bright.If red light is bright, should change battery.
(b) press reset button, hummer rings; Openhanded opening, hummer are not rung.If red light is long bright, hummer is long to be rung, and then the electroscope self check is not passed through, and should stop using.
(3) the 1000kV ultrahigh voltage alternating current transmission lines is carried out electrical verification, should adopt contactless line type electroscope, operating personnel can carry out electrical verification in shelves also can carry out electrical verification near shaft tower.Operation steps is:
(a) operating personnel be positioned at tested phase conductor under, open the electroscope power switch.
(b) treat that electroscope enters duty to be checked by self check and preliminary examination stage after, electroscope is slowly lifted about 2.0m～2.5m height to distance ground, and keeps electroscope perpendicular to the about 3s in ground.
(c) indication judges whether tested phase conductor is charged according to the electroscope acousto-optic.
(4) 1000kV extra-high-voltage alternating current transformer station or switch station equipment are carried out electrical verification, should adopt type electroscope in the contactless station, operating personnel should carry out electrical verification below equipment under test.Operation steps is:
(a) operating personnel are positioned at the equipment under test below, open the electroscope power switch.
(b) treat that electroscope enters duty to be checked by self check and preliminary examination stage after, electroscope is slowly lifted about 6.0m height to distance ground, and keeps electroscope perpendicular to the about 3s in ground.
(c) indication judges whether equipment under test is charged according to the electroscope acousto-optic.
(d) if need to get rid of nearby device, then should below equipment under test and jamming equipment, carry out the electrical verification operation respectively, come judgment device whether charged according to the difference of alerting signal to the interference that the electrical verification the possibility of result exists.
Claims (2)
1,1000kV extra-high voltage AC non-contact type electricity checking device electricity-testing method is characterized in that: comprise self check, preliminary examination, detection, comparison and report to the police five stages; After self check is passed through,, carry out value that the electric field intensity of this working position of data acquisition obtains reference value as electrical verification with certain frequency through time-delay; Field intensity curve and variation tendency according to space electric field are come electrical verification, reflect the size of electric field by the sound and optic signal frequency speed of reporting to the police.
2, adopt the 1000kV extra-high voltage AC non-contact type electricity checking device of the described method of claim 1, it is characterized in that:
Comprise signal acquisition module, signal amplification module, signal processing module, alarm module and analog to digital conversion and data processing module, the voltage signal of the extra-high voltage that signal acquisition module collects amplifies through the signal amplification module, handles through signal processing module again; Data processing module carries out value that the electric field intensity of this working position of data acquisition the obtains reference value as electrical verification with certain frequency, comes electrical verification according to the field intensity curve and the variation tendency of space electric field; After the signal that analog to digital conversion and data processing module transmit signal processing module carried out data processing, the interlink warning module was made mutually at the sound, visual alarm.
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| CN101788600A (en) * | 2010-02-11 | 2010-07-28 | 河南省电力公司商丘供电公司 | Non-contact type high-voltage AC electroscopy |
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| CN111025006A (en) * | 2019-12-20 | 2020-04-17 | 云南电网有限责任公司玉溪供电局 | Non-contact voltage detection and phase recognition device |
| CN114137287A (en) * | 2021-12-02 | 2022-03-04 | 国网江苏省电力有限公司常州供电分公司 | Electricity-testing self-detection warning device based on high applicability of power equipment |
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