CN101923120A - Extra-high voltage alternating current non-contact multi-channel electricity testing method - Google Patents
Extra-high voltage alternating current non-contact multi-channel electricity testing method Download PDFInfo
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- CN101923120A CN101923120A CN2010101847958A CN201010184795A CN101923120A CN 101923120 A CN101923120 A CN 101923120A CN 2010101847958 A CN2010101847958 A CN 2010101847958A CN 201010184795 A CN201010184795 A CN 201010184795A CN 101923120 A CN101923120 A CN 101923120A
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Abstract
The invention provides an extra-high voltage alternating current non-contact multi-channel electricity testing method. The method comprises self-checking, pre-checking, multi-channel checking, comparison and alarming stages and the following steps of: after self-checking is passed and time delay is performed, performing detection by using a parallel plate capacitance sensing principle and double channels; acquiring data of a horizontal channel and a vertical channel at a certain frequency; comparing the electric intensity values of the working positions of tested objects acquired from the two channels; taking a larger current intensity value as an electricity testing value; putting the tested objects at lower positions to measure the current intensity values of the two passages by the same method; taking a larger current intensity value as an alarm threshold; testing electricity according to the field intensity curve and variation trend of a space electric field; and reflecting the magnitude of an electric field through sound and light alarm signals. The method can effectively eliminate the disturbance of neighboring electrified equipment and solves the problems of poor repeatability and low correctness of an electricity testing result caused by the strong disturbance of an electrified body adjacent to tested equipment on space field intensity.
Description
Technical field
The invention belongs to the research method field of ultra-high voltage AC input transformation device managing security tools and instruments, be specifically related to a kind of extra-high voltage alternating current non-contact multi-channel electricity testing 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.
In the Chinese patent 200910060796.9 " 1000kv extra-high voltage AC non-contact type electricity checking method and electroscope thereof ", the electrical verification reference value is obtained by the electric field intensity that data processing module carries out this working position of data acquisition with certain frequency, alarm threshold value is by site test repeatedly, rationally choose according to the variation tendency of electric field and to obtain, because the charging equipment in transformer station and the current conversion station is many, interference between the charging equipment is bigger, cause charging equipment formate field intensity on every side complicated and changeable, may disturb during electrical verification, so obtaining of electrical verification reference value and alarm threshold value is subjected to external interference easily in this patent, accuracy is not high.
Summary of the invention
The purpose of this invention is to provide a kind of extra-high voltage alternating current non-contact multi-channel electricity testing method; whether the mode of the alarm threshold value of employing comparison binary channels collection and the electricity testing value size of binary channels collection detects testee charged; be used for the 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: extra-high voltage alternating current non-contact multi-channel electricity testing method, comprise self check, preliminary examination, comparison and warning, and it is characterized in that: also comprise multi-channel detection; After self check is passed through, through time-delay, detect and adopt the parallel plate capacitor principle of induction, and adopt binary channels to detect, carry out the data acquisition of horizontal channel and the data acquisition of vertical channel with certain frequency, then the electric field intensity value of the testee working position of two passage collections is compared, bigger as electricity testing value; Adopt and use the same method, place lower position to measure the electric field intensity value of two passages once more testee, bigger as alarm threshold value, field intensity curve and variation tendency according to space electric field are come electrical verification, the size that reflects electric field by the sound and optic signal of reporting to the police, this method can reduce effectively that other charging equipments have improved accuracy of measurement to the interference of equipment under test measurement result in the transformer station.
The invention has the beneficial effects as follows: because the charging equipment in transformer station and the current conversion station is concentrated, the electric pressure parameter is higher, the charging equipment complex distribution.Galvanoscopic measurement result there is bigger interference, electricity testing value of the present invention and alarm threshold value all are that binary channels collects, by the measurement of horizontal channel to the horizontal direction field intensity, can effectively reduce the interference on the horizontal direction, 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 present invention has satisfied China's AC extra high voltage transmission line engineer operation security protection requirement, has filled up the blank of China on extra-high voltage electric transmission and transformation device security Work tool, is 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.
Fig. 6 is ground clearance of embodiment of the invention electroscope and magnitude of voltage corresponding diagram.
Specific embodiments
Below in conjunction with accompanying drawing extra-high voltage alternating current non-contact multi-channel electricity testing method of the present invention is described further.
Fig. 1 is a process flow diagram of the present invention, extra-high voltage alternating current non-contact multi-channel electricity testing 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 the parallel plate capacitor 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 the testee working position of two passage collections is compared, and be bigger as electricity testing value; Adopt and use the same method, place lower position to measure the electric field intensity value of two passages once more testee, bigger as alarm threshold value, come electrical verification according to the field intensity curve and the variation tendency of space electric field then, carry out the comparison of two values, if electricity testing value, illustrates then that testee is charged greater than alarm threshold value, and carry out sound and light alarm; 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 designs according to electromagnetic induction principle collection voltage signal; Parallel plate capacitor and resistance parallel connection, the voltage that utilizes the voltage at measuring resistance two ends to obtain the parallel plate capacitor two ends can calculate the electric field intensity of electroscope space environment of living in.
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 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 is to improve voltage gain, and it can be made up of one or more levels amplifying circuit.Output stage generally is made up of voltage follower or complementary voltage follower, to reduce output resistance, improves carrying load ability.Biasing circuit 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 AC 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 and single-chip microcomputer.The signals collecting part can be realized by the Single-chip Controlling analog to digital converter, gather with certain frequency, the frequency of gathering can be decided by the sampling rate of analog to digital converter, any a precision reaches the analog to digital converter of system requirements can be as data acquisition chip, the data of gathering are carried out data processing through single-chip microcomputer and are stored in the single-chip microcomputer, as shown in Figure 5; Data processing, comparison and sound and light alarm can not need other peripheral circuit by the software control chip microcontroller, and system is not high to the requirement of single-chip microcomputer yet, and the single-chip microcomputer of any 51 kernels can satisfy system requirements.
Embodiment:
1. measure in the line
At first, choose suitable measurement point A, open electroscope, first self check; When confirming that electroscope is working properly, carry out electrical verification.
Be placed on the following place of liftoff 20cm and carry out the collection of field intensity value, as the factor of alarm threshold value, electroscope horizontal channel value at this moment is V
1=0.52, the vertical channel value is H
1=0.48.So according to program, with V
1With H
1Value compare, bigger as the alarm threshold value factor, alarm threshold value is T=V
1* 3.8 (3.8 factor that obtain for multiple test are determined on a case-by-case basis), promptly 1.976.
Then electroscope is installed on the insulating bar, utilizes insulating bar that electroscope is released apart from the place of ground more than 3 meters, carry out the collection of field intensity value, the horizontal channel value V of this moment
2=2.35, the vertical channel value is H
2=1.34, carry out whether charged judgement by program, because V
2＞T is so it is charged to be judged as testee.
2. in transformer station, whether whether charged inspection machine step with to check transmission pressure on the line charged the same.If when the next door charging equipment was uncomplicated, galvanoscopic reading rule basically was the same, vertical channel is bigger than normal than the value of horizontal channel.
If the next door charging equipment is more, during complex distribution, galvanoscopic value may change, and when measuring near certain A of transformer station phase filtering tower, the collection of field intensity value is carried out in the place below liftoff 20cm, electroscope horizontal channel value V at this moment
1=1.53, vertical channel H
1=1.48.According to program, with V
1With H
1Value compare, bigger as the alarm threshold value factor, alarm threshold value is T=V
1* 2 (2 for the factor that obtains of test in the station repeatedly, are determined on a case-by-case basis), promptly 3.06.Then electroscope is installed on the insulating bar, utilizes insulating bar that electroscope is released apart from the place of ground more than 3 meters, carry out the collection of field intensity value, the horizontal channel value V of this moment
2=3.68, the vertical channel value is H
2=3.84, this moment horizontal channel H
2Value greater than V
2Value, be that field intensity value on the measurement point horizontal direction is bigger, might cause because of near charging equipment complex distribution, because the field intensity value of horizontal direction is bigger, might be influential to the value of vertical channel, thereby influence galvanoscopic measurement result, should choose again and measure the place, again equipment under test is carried out electrical verification and measure.Table 1 is field intensity value and an electroscope magnitude of voltage corresponding tables under the route survey center line, because the internally charged device distribution complexity of transformer station, curve distribution is comparatively complicated, and concrete field intensity value and magnitude of voltage corresponding relation will be made a concrete analysis of.Fig. 6 is the corresponding curve map of table 1.
Table 1
| Ground identity distance electroscope is apart from m | Field intensity value kV/m under the line | Electroscope magnitude of voltage V |
| 0.2? | 4.35? | 0.52? |
| 0.5? | 5.84? | 0.86? |
| 1? | 6.57? | 1.12? |
| 1.5? | 8.12? | 1.45? |
| 2? | 10.24? | 1.73? |
| 2.5? | 12.48? | 1.92? |
| 3? | 14.69? | 2.24? |
| 4? | 17.31? | 2.85? |
Claims (1)
1. extra-high voltage alternating current non-contact multi-channel electricity testing method comprises self check, preliminary examination, comparison and warning, it is characterized in that: also comprise multi-channel detection; After self check is passed through, through time-delay, detect and adopt the parallel plate capacitor principle of induction, and adopt binary channels to detect, carry out the data acquisition of horizontal channel and the data acquisition of vertical channel with certain frequency, then the electric field intensity value of the testee working position of two passage collections is compared, bigger as electricity testing value; Adopt and use the same method, place lower position to measure the electric field intensity value of two passages once more testee, bigger as alarm threshold value, come electrical verification according to the field intensity curve and the variation tendency of space electric field, reflect the size of electric field by the sound and optic signal of reporting to the police.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249031A (en) * | 2016-08-30 | 2016-12-21 | 重庆理工大学 | Power frequency high voltage measuring device with electricity |
| CN115308520A (en) * | 2022-10-10 | 2022-11-08 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2503494Y (en) * | 2000-11-20 | 2002-07-31 | 重庆德通科技开发有限公司 | 50HZ power frequency electric field strength instrument |
| CN101487858A (en) * | 2009-02-20 | 2009-07-22 | 国网电力科学研究院 | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus |
| CN101710151A (en) * | 2009-12-11 | 2010-05-19 | 国网电力科学研究院 | Extra-high voltage direct current non-contact multi-channel electricity checking method |
-
2010
- 2010-05-27 CN CN2010101847958A patent/CN101923120A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2503494Y (en) * | 2000-11-20 | 2002-07-31 | 重庆德通科技开发有限公司 | 50HZ power frequency electric field strength instrument |
| CN101487858A (en) * | 2009-02-20 | 2009-07-22 | 国网电力科学研究院 | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus |
| CN101710151A (en) * | 2009-12-11 | 2010-05-19 | 国网电力科学研究院 | Extra-high voltage direct current non-contact multi-channel electricity checking method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249031A (en) * | 2016-08-30 | 2016-12-21 | 重庆理工大学 | Power frequency high voltage measuring device with electricity |
| CN115308520A (en) * | 2022-10-10 | 2022-11-08 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
| CN115308520B (en) * | 2022-10-10 | 2023-01-24 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
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Application publication date: 20101222 |