CN102645616A - Fault addressing method for transmission line - Google Patents
Fault addressing method for transmission line Download PDFInfo
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- CN102645616A CN102645616A CN2012101398252A CN201210139825A CN102645616A CN 102645616 A CN102645616 A CN 102645616A CN 2012101398252 A CN2012101398252 A CN 2012101398252A CN 201210139825 A CN201210139825 A CN 201210139825A CN 102645616 A CN102645616 A CN 102645616A
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Abstract
The invention discloses a fault addressing method for a transmission line, mainly relates the technical field of power grid detection and monitoring, and solves the problems of low accuracy and high cost of traditional addressing methods. According to the fault addressing method for the transmission line, by means of pilot frequency standing wave virtual method addressing, the advantages of other traditional methods and the transmission principle of waves, positions of wave troughs and wave crests of standing waves, which are formed on the transmission line, are different due to different frequency of the waves, the wave crests of the waves emerge right at the injection points of the signals by changing the frequencies of the waves, the length of the line can be calculated under the condition of known wave velocity due to the fixed wave speed on the line, and the positioning is more accurate. According to the fault addressing method for the transmission line, the manufactured instruments have pattern digitization interfaces and are small in volume, convenient to carry, low in cost, simple in operation, capable of achieving fault addressing in transformer substations, high in work efficiency, capable of saving more precious time and a large amount of manual labors, financial resources and material resources for electric power departments, and good in application and popularization values.
Description
Technical field
The present invention relates to operation of power networks fault diagnosis technology field, relate in particular to a kind of transmission line malfunction method for addressing.
Background technology
At present, domestic a large amount of 35KV and above transmission line of electricity widespread distribution are mainly born the transformation task of electric energy in the mountain area.But remote mountain areas because circuit mostly is laid in; Aggravated the possibility that transmission line of electricity breaks down and the quality fault of line insulation system aging if add the disasteies such as frequent generation thunder and lightning, landslide, typhoon attack, earthquake, ice and snow of various extreme disasteies in recent years, the differentiation of line fault distance, maintenance and line walking be difficulty very.
In recent years; People are comparing many research aspect the transmission line malfunction detection method; The method of representative is exactly traveling wave method, impedance method, failure wave-recording and GPS localization method, and these methods are all obtaining progress in various degree aspect the transmission line malfunction addressing.
The various electric parameters that record obtained when the unit faults recorder analysis method was utilized fault are carried out analysis-by-synthesis by the technician afterwards, obtain abort situation.The development of Along with computer technology and artificial intelligence technology, the unit faults recorder analysis method can be accomplished through automation equipment fast.But this method can receive the influence of system impedance and trouble spot transition impedance, and causes the decline of fault localization precision.
Impedance method is divided into two kinds of single-ended method and both-end methods; Though single-ended method principle is simple, be easy to practicality, equipment drop into low, do not need extra communication apparatus; But the precision of single-ended impedance method is not high in practical application, receives the influence of trouble spot transition resistance, offside system impedance, load current especially easily.Owing in computation process, algorithm is based upon on the basis of one or several hypothesis often simultaneously, and these hypothesis are usually inconsistent with actual conditions, so there is the original reason error that can't eliminate in the single-ended impedance method.The both-end method utilizes the electric information amount at circuit two ends to carry out fault localization, and with the influence from principle elimination transition resistance, but the shortcoming of both-end method is: calculated amount is big, equipment investment is big, need extra synchronous and communication apparatus.
The degree of accuracy of traveling wave method specific impedance method location is high, but reliability, antijamming capability and adaptability are relatively poor.Particularly because the power distribution network line construction is complicated, load dispersing, the row ripple in each section circuit connection place, each primary equipment produces very complicated refraction and reflection, the identification of travelling wave signal has received and having seriously influenced.In addition, the extraction of travelling wave signal also can receive the influence than heavy load.
Summary of the invention
The purpose of this invention is to provide the transmission line malfunction method for addressing that a kind of reliability and degree of accuracy are high, cost is low.
For realizing that the technical scheme that the object of the invention adopted is: a kind of transmission line malfunction method for addressing, adopt the virtual method of alien frequencies standing wave to carry out fault address, comprise with step:
A. measure sampling through frequency sweep circuit;
B. select corresponding voltage class letter master to confirm the velocity of wave of this electric pressure line according to institute's survey line road electric pressure;
C. the key that moves to left and move to right through control changes the position of tag line, seeks trough minimum Frequency point takes place;
D. binding analysis is compression and the amplification that the x direction of principal axis carries out curve to the curve of being surveyed at frequency axis, regulates the fineness of measuring;
E. the line end that obtains through mathematics model analysis identifies and carries out the data of distance calculation for the malfunction of open circuit broken string or short circuit ground connection;
F. the velocity of wave that is calculated under the known voltage grade by single-chip microcomputer designs the distance L=0.25v/f of conversion trouble spot to measurement point;
G. confirm output signal voltage and frequency variation characteristics relation through standing wave valley detection module.
A kind of transmission line malfunction method for addressing of the present invention adopts the virtual method of alien frequencies standing wave to carry out fault address, utilizes the transmission principle of ripple; On transmission line of electricity, form standing wave by it, because wave frequency is different, the trough crest of standing wave is just different with regard to the position; Through changing wave frequency; Make the trough of ripple just in time appear at the decanting point of signal,, under the situation of known velocity of wave, just can calculate Route Length because the velocity of wave on the circuit is fixed.The method that provides according to the invention only need be carried out fault measuring to the circuit more than the 35KV under the power down mode in transformer station, utilize the instrument of this kind method manufacturing have volume little, easy to carry, with low cost, from the charged pool AC/DC, have figure and digital Presentation Function, easy to operate.In transformer station, faulty line is detected, avoided time-consuming the taking a lot of work of circuit patrolman long drive, improved work efficiency; It can be definite the out of order distance of measurement, confirm the fault shaft tower, shorten the malfunction elimination time; Reduced emergency repair cost, it is about more than 30% to increase economic efficiency.Annual to handle two transmission line of electricity repairing tasks is example with each prefecture-level company, and Direct Maintenance Cost is calculated with electric quantity loss 500,000 indirectly, and the loss that causes just reaches 1,000,000 yuan but also be the most conservative calculating.Simultaneously, in current power supply with protect under the increasing situation of electric task, shorten transmission line of electricity and search fault-time, considerable economic is not only arranged, and social benefit is also fairly obvious simultaneously.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further explanation:
Standing-wave ratio (SWR) when Fig. 1 is the circuit open fault and the graph of a relation of change of frequency;
The graph of a relation of standing-wave ratio (SWR) and frequency when Fig. 2 is the line short fault.
Embodiment
When design was measured, lead-out terminal was with wire connection failure phase overhead transmission line, and ground terminal connects the ground wire of transformer.If overhead transmission line generation phase fault, can a phase output terminals, another ground terminal that joins.
A. measure sampling through frequency sweep circuit.
B. select corresponding voltage class letter master to confirm the velocity of wave of this electric pressure line according to institute's survey line road electric pressure.
C. the key that moves to left and move to right through control changes the position of tag line, seeks trough minimum Frequency point takes place.Like Fig. 1, shown in Figure 2: f0 is the frequency of the first standing wave point, and through the key or the key mobile logo line that moves to right of moving to left, near the adjustment first standing wave point is repeatedly observed standing-wave ratio (SWR) and changed, and finds out minimum point under the analytic function state.This moment, fault distance was L, and the frequency of the first standing wave point is f, and standing-wave ratio (SWR) is A.
D. binding analysis is compression and the amplification that the x direction of principal axis carries out curve to the curve of being surveyed at frequency axis, regulates the fineness of measuring; For the ease of finding out the minimum A value of the first standing wave point, can be through amplifying or compression curve, so that obtain best fineness.The entering analysis state is analyzed after adjusting fineness.
E. the line end that obtains through mathematics model analysis identifies and carries out the data of distance calculation for the malfunction of open circuit broken string or short circuit ground connection; Sampled measurements finishes the back and judges line fault character short circuit or open circuit automatically.Can change fault judgement character through short/open if get the wrong sow by the ear automatically, distance L will change.If circuit is open fault, show that curve is similar with cosine curve, both the value of A along with the increase of frequency by greatly to little variation, see Fig. 1.If circuit is short trouble, show that curve is similar with sinusoidal curve, both the value of A along with the increase of frequency by little to greatly again to little variation, see Fig. 2.
F. the velocity of wave that is calculated under the known voltage grade by single-chip microcomputer designs the distance L=0.25v/f of conversion trouble spot to measurement point.
G. confirm output signal voltage and frequency variation characteristics relation through standing wave valley detection module.According to concrete line segment parameter testing, the velocity of wave parameter of overhead transmission line in the update routine is to guarantee measuring accuracy.When the user can be to the route survey of known length L0, measure non-fault phase length L 1 and fault length L 2 mutually respectively, can obtain fault distance through formula: Lx=L0 * L2/L1.
Transmission theory and theoretical formula according to ripple can know that near more from the test point distance when the trouble spot, the frequency f 0 when first standing wave trough appears in decanting point is high more.But energy measurement is less than the value of f0 when the trouble spot distance is too near; When the value of trouble spot f0 when the test point distance is too far away possibly have only the hundreds of hertz; We measured possibly not be the first standing wave point but second, third standing wave point; When fault distance is greater than 50kM shown in the first standing wave point in the curve waveform, can measure accurately greater than the gear of 50kM through selection.
The method that provides according to the invention only need be carried out fault measuring to the circuit more than the 35KV under the power down mode in transformer station, utilize the instrument of this kind method manufacturing have volume little, easy to carry, with low cost, from the charged pool AC/DC, have figure and digital Presentation Function, easy to operate.In transformer station, faulty line is detected, avoided time-consuming the taking a lot of work of circuit patrolman long drive, improved work efficiency; It can be definite the out of order distance of measurement, confirm the fault shaft tower, shorten the malfunction elimination time; Reduced emergency repair cost, it is about more than 30% to increase economic efficiency.Annual to handle two transmission line of electricity repairing tasks is example with each prefecture-level company, and Direct Maintenance Cost is calculated with electric quantity loss 500,000 indirectly, and the loss that causes just reaches 1,000,000 yuan but also be the most conservative calculating.Simultaneously, in current power supply with protect under the increasing situation of electric task, shorten transmission line of electricity and search fault-time, considerable economic is not only arranged, and social benefit is also fairly obvious simultaneously.
Claims (1)
1. transmission line malfunction method for addressing is characterized in that: adopt the virtual method of alien frequencies standing wave to carry out fault address, comprise with step:
A. measure sampling through frequency sweep circuit;
B. select corresponding voltage class letter master to confirm the velocity of wave of this electric pressure line according to institute's survey line road electric pressure;
C. the key that moves to left and move to right through control changes the position of tag line, seeks trough minimum Frequency point takes place;
D. binding analysis is compression and the amplification that the x direction of principal axis carries out curve to the curve of being surveyed at frequency axis, regulates the fineness of measuring;
E. the line end that obtains through mathematics model analysis identifies and carries out the data of distance calculation for the malfunction of open circuit broken string or short circuit ground connection;
F. the velocity of wave that is calculated under the known voltage grade by single-chip microcomputer designs the distance L=0.25v/f of conversion trouble spot to measurement point;
G. confirm output signal voltage and frequency variation characteristics relation through standing wave valley detection module.
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| CN2012101398252A CN102645616A (en) | 2012-05-08 | 2012-05-08 | Fault addressing method for transmission line |
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| CN2012101398252A CN102645616A (en) | 2012-05-08 | 2012-05-08 | Fault addressing method for transmission line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592568A (en) * | 2013-10-29 | 2014-02-19 | 天津大学 | Feeder line fault addressing method based on different-pulse peak sets |
| CN105510767A (en) * | 2015-11-06 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Fault point positioning method for multiple interconnection cables of different types |
| CN107817414A (en) * | 2017-11-07 | 2018-03-20 | 国网四川省电力公司电力科学研究院 | Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal |
| CN111061204A (en) * | 2019-12-31 | 2020-04-24 | 龙岩龙安安全科技有限公司 | Building safety control system and control method thereof |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592568A (en) * | 2013-10-29 | 2014-02-19 | 天津大学 | Feeder line fault addressing method based on different-pulse peak sets |
| CN103592568B (en) * | 2013-10-29 | 2016-05-25 | 天津大学 | Feeder fault addressing method based on different pulse crest group |
| CN105510767A (en) * | 2015-11-06 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Fault point positioning method for multiple interconnection cables of different types |
| CN107817414A (en) * | 2017-11-07 | 2018-03-20 | 国网四川省电力公司电力科学研究院 | Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal |
| CN111061204A (en) * | 2019-12-31 | 2020-04-24 | 龙岩龙安安全科技有限公司 | Building safety control system and control method thereof |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
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Application publication date: 20120822 |