CN101710151A - Extra-high voltage direct current non-contact multi-channel electricity checking method - Google Patents
Extra-high voltage direct current non-contact multi-channel electricity checking method Download PDFInfo
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- CN101710151A CN101710151A CN200910273223A CN200910273223A CN101710151A CN 101710151 A CN101710151 A CN 101710151A CN 200910273223 A CN200910273223 A CN 200910273223A CN 200910273223 A CN200910273223 A CN 200910273223A CN 101710151 A CN101710151 A CN 101710151A
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Abstract
The invention provides an extra-high voltage direct current non-contact multi-channel electricity checking method comprising five steps of self-checking, prechecking, multi-channel detection, comparison and alarming; data acquisition of a horizontal channel and a vertical channel is carried out according to a certain frequency through time delay after the self-checking passes; the electric field intensity values of the work positions acquired in the two channels are compared, and the larger value serves as a reference value of electricity checking; the electricity checking is performed according to the field intensity curve and variation trend of the space electric field; the size of the electric field is reflected by acoustic signals and optical signals of alarming, thus effectively eliminating the interference of adjacent electrified equipment, solving the difficulties that the electricity checking has poor repetitiveness and low accuracy due to the interference of the electrified body of the adjacent equipment to be detected on the space field intensity.
Description
Technical field
The invention belongs to the research method field of extra-high voltage direct-current power transmission and transforming equipment managing security tools and instruments, be specifically related to a kind of extra-high voltage direct current non-contact multi-channel electricity checking method.
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 for the capacitor type electroscope of direct current 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.
The extra-high voltage direct-current project of transmitting and converting electricity 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 extra high voltage direct current transmission line 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 extra-high voltage direct-current project of transmitting and converting electricity is that 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 extra-high voltage direct-current project of transmitting and converting electricity 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 extra-high voltage direct-current project of transmitting and converting electricity 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 multi-channel electricity checking method of extra-high voltage direct-current project of transmitting and converting electricity.
Summary of the invention
The purpose of this invention is to provide a kind of extra-high voltage direct current non-contact multi-channel electricity checking method, adopt alternation inductive method principle of induction to come electrical verification, be used for extra-high voltage direct-current power transmission and transformation line engineering, 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: extra-high voltage direct current non-contact multi-channel electricity checking method comprises self check, preliminary examination, it is characterized in that: also comprise multi-channel detection, comparison and warning; At first will carry out self check, whether detection system can operate as normal, if self check does not have to communicate, i.e. immediate cancel electrical verification work if self check is passed through, will be delayed time; After time-delay, detect to adopt alternation inductive method principle of induction to come electrical verification, and adopt binary channels to detect, promptly horizontal channel and vertical channel detect simultaneously, and the electric field intensity value of this working position of two passage collections is compared the bigger reference value as electrical verification; Set corresponding electric field alarm threshold value according to the field intensity curve of space electric field and variation tendency then and carry out data processing; Carry out the comparison of two values again,, and carry out sound and light alarm if reference value, illustrates then that testee is charged greater than alarm threshold value; Otherwise illustrate that testee is not charged, can continue next testee is measured.
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 multi-channel 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 the extra-high voltage direct-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's direct current UHV transmission line engineer operation security protection requirement, filled up the blank of China on extra-high voltage electric transmission and transformation device security Work tool, be applicable to the extra-high voltage electric transmission and transformation line data-logging.
Description of drawings
The process flow diagram that Fig. 1 implements for method.
Fig. 2 is the signal acquisition module schematic diagram of test section among Fig. 1.
Fig. 3 is the signal amplification module schematic diagram of test section among Fig. 1.
Fig. 4 is a rectification circuit schematic diagram in the signal processing module of test section among Fig. 1.
Fig. 5 is the interface circuit schematic diagram of analog to digital conversion circuit and control chip.
Specific embodiments
Below in conjunction with accompanying drawing extra-high voltage direct current non-contact multi-channel electricity checking method of the present invention is described further.
Description of symbols among Fig. 2: 1-rotor, 2-stator, 3-ground brush, 4-synchronous generator, 5-motor, 6-prime amplifier, 7-circuit for controlling motor.
Description of symbols among Fig. 3: 8-differential input stage, 9-voltage amplifier stage, 10-output stage, 11-biasing circuit.
Description of symbols among Fig. 5: 12-analog to digital converter, 13-single-chip microcomputer.
Fig. 1 is a process flow diagram of the present invention, extra-high voltage direct current non-contact multi-channel electricity checking method is divided into self check, preliminary examination, detection, comparison, five stages of sound and light alarm, at first to carry out self check, whether detection system can operate as normal, if self check does not have to communicate, be immediate cancel electrical verification work,, will delay time if self check is passed through; After time-delay, detect to adopt alternation inductive method principle of induction to come electrical verification, and adopt binary channels to detect, promptly horizontal channel and vertical channel detect simultaneously, and the electric field intensity value of this working position of two passage collections is compared the bigger reference value as electrical verification; Set corresponding electric field alarm threshold value according to the field intensity curve of space electric field and variation tendency then and carry out data processing; Carry out the comparison of two values again,, and carry out sound and light alarm if reference value, illustrates then that testee is charged greater than alarm threshold value; Otherwise illustrate that testee is not charged, can continue next testee is measured.
Test section among Fig. 1 can be divided into signal amplification module, signal processing module and signal acquisition module again.
As shown in Figure 2, signal acquisition module is gathered voltage signal according to the alternation inductive method and is designed, and it is made of stator 2 (sensing chip) and rotor 1 (shield blade).When rotor 1 rotation, stator 2 periodically is exposed among the external electrical field E, or the conductively-closed sheet blocks, and makes E=0, goes round and begins again like this, just produces the alternation output signal.
The signal amplification module of test section can realize that as shown in Figure 3, it has adopted the operational amplification circuit that differential signal is amplified to suppress common mode interference signal with the method among Fig. 3; The differential type amplifying circuit that differential input stage 8 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 9 is to improve voltage gain, and it can be made up of one or more levels amplifying circuit.Output stage 10 generally is made up of voltage follower or complementary voltage follower, to reduce output resistance, improves carrying load ability.Biasing circuit 11 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.
Signal processing module is made of prime second order filter, rectification circuit and back level second order filter, and the prime wave filter is used to cut down high-frequency interferencing signal, and back level wave filter is used for the filtration of ripple; Rectification is to convert AC signal to direct current signal, can be realized by precise rectification circuit.As shown in Figure 4, rectification circuit is made up of two operational amplifiers and peripheral resistance, diode: previous operational amplifier and corresponding resistor, diode constitute an equal proportion amplifying circuit; Second operational amplifier and advance signal are formed an adding circuit, can change the enlargement factor of rectification circuit by the value that changes R14.The resistance value of R8, R9, R10, R11, R12, R13, R14 is respectively: 10K, 10K, 10K, 20K, 10K, 10K, 20K.
Signal acquisition module, data processing, comparison and sound and light alarm can be made of analog to digital converter 12 and single-chip microcomputer 13.The signals collecting part can be realized by single-chip microcomputer 13 control analog to digital converters, gather with certain frequency, the frequency of gathering can be decided by the sampling rate of analog to digital converter 12, any a precision reaches the analog to digital converter 12 of system requirements can be as data acquisition chip, the data of gathering are carried out data processing through single-chip microcomputer 13 and are stored in the single-chip microcomputer, as shown in Figure 5; Data processing, comparison and sound and light alarm can be realized that by software control single-chip microcomputer 13 do not need other peripheral circuit, system is not high to the requirement of single-chip microcomputer 13 yet, and the single-chip microcomputer of any 51 kernels can satisfy system requirements.
The reference value of the invention process electrical verification is variable, enter the working position, press reset key, self check is by after time-delay, carry out electric field preliminary examination work, carry out multi-channel data acquisition, be i.e. the collection of horizontal channel and vertical channel with certain frequency, and comparing the electric field intensity of two these working positions of passage, wherein bigger value is as the electrical verification reference value.Set corresponding electric field alarm threshold value according to the field intensity curve of space electric field and variation tendency and judge whether equipment under test is charged.
Claims (1)
1. extra-high voltage direct current non-contact multi-channel electricity checking method comprises self check, preliminary examination, it is characterized in that: also comprise multi-channel detection, comparison and warning; At first will carry out self check, whether detection system can operate as normal, if self check does not have to communicate, i.e. immediate cancel electrical verification work if self check is passed through, will be delayed time; After time-delay, detect to adopt alternation inductive method principle of induction to come electrical verification, and adopt binary channels to detect, promptly horizontal channel and vertical channel detect simultaneously, and the electric field intensity value of this working position of two passage collections is compared the bigger reference value as electrical verification; Set corresponding electric field alarm threshold value according to the field intensity curve of space electric field and variation tendency then and carry out data processing; Carry out the comparison of two values again,, and carry out sound and light alarm if reference value, illustrates then that testee is charged greater than alarm threshold value; Otherwise illustrate that testee is not charged, can continue next testee is measured.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876673A (en) * | 2010-05-27 | 2010-11-03 | 国网电力科学研究院 | Extreme high voltage direct-current non-contact distance-measurement electricity-testing method |
| CN101923120A (en) * | 2010-05-27 | 2010-12-22 | 国网电力科学研究院 | Extra-high voltage alternating current non-contact multi-channel electricity testing method |
| CN104020343A (en) * | 2014-06-06 | 2014-09-03 | 西安电子科技大学 | High voltage power transmission line live part verification method based on electric field intensity difference distribution curve matching |
| CN107850640A (en) * | 2015-06-03 | 2018-03-27 | 量子联合有限合伙公司 | DC meter and application method |
-
2009
- 2009-12-11 CN CN200910273223A patent/CN101710151A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876673A (en) * | 2010-05-27 | 2010-11-03 | 国网电力科学研究院 | Extreme high voltage direct-current non-contact distance-measurement electricity-testing method |
| CN101923120A (en) * | 2010-05-27 | 2010-12-22 | 国网电力科学研究院 | Extra-high voltage alternating current non-contact multi-channel electricity testing method |
| CN104020343A (en) * | 2014-06-06 | 2014-09-03 | 西安电子科技大学 | High voltage power transmission line live part verification method based on electric field intensity difference distribution curve matching |
| CN104020343B (en) * | 2014-06-06 | 2016-08-31 | 西安电子科技大学 | High voltage transmission line electricity-testing method based on electric field intensity difference cloth Curve Matching |
| CN107850640A (en) * | 2015-06-03 | 2018-03-27 | 量子联合有限合伙公司 | DC meter and application method |
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Application publication date: 20100519 |