CN108801442B - A kind of transmission line galloping monitoring method based on ground wire induced voltage - Google Patents
A kind of transmission line galloping monitoring method based on ground wire induced voltage Download PDFInfo
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- CN108801442B CN108801442B CN201810575566.5A CN201810575566A CN108801442B CN 108801442 B CN108801442 B CN 108801442B CN 201810575566 A CN201810575566 A CN 201810575566A CN 108801442 B CN108801442 B CN 108801442B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses a kind of transmission line galloping monitoring methods based on ground wire induced voltage, it is assumed that needing to deduce waving frequency, wave amplitude and waving position for transmission line wire by measuring the induced voltage on certain transmission line of electricity the n-th base tower ground wire, it include: the oscillograph that recording voltage waveform is installed in the n-th base shaft tower, it is another to terminate on tower body on one end Jie of oscillograph voltage probe and an aerial earth wire of tower body insulation；Oscillograph is equipped with activation threshold value, oscillograph not recording voltage waveform when route works normally；When conducting wire is waved, ground wire is coupled out induced overvoltage, and oscillograph is triggered and recording voltage waveform；According to signal analysis and Theory of Electromagnetic Field, the coefficient of coup between aerial earth wire and conducting wire is calculated, to extrapolate waving frequency and waving amplitude for conducting wire；The waveform recorded by analyzing the oscillograph being installed in different base shaft towers, positions to position is waved.
Description
Technical field
The present invention relates to technical field of high voltage more particularly to a kind of transmission line galloping prisons based on ground wire induced voltage
Survey method, for monitoring waving for overhead transmission line.
Background technique
Overhead transmission line will receive the influence of natural conditions in the process of running and a variety of disaster accidents occur, and wave just
It is wherein to endanger more serious one kind.A kind of low frequency that overhead transmission line galloping, that is, conducting wire generates under the excitation of wind
The self-excitation seismism of (about 0.1~3Hz), large amplitude (up to 10m or more).The harm for waving generation is various, less serious case
Flashover, tripping can occur, fitting can then occur for severe one and insulator damage, wire strand breakage, broken string, shaft tower bolt looseness fall off,
Even tower, leads to great power grid accident.It is prone to the local sensitivity location waved mainly in air port, opening, rivers
Lake surface etc. is easy to icing, and wind motivates stronger area.
Monitor waving for transmission line of electricity by way of analyzing transmission line of electricity live video picture mostly at present, however this
The distance that kind mode can monitor is shorter, and analyzes video pictures and calculate complexity, and required time is longer.It now proposes a kind of based on ground
The transmission line galloping monitoring method of line induced voltage.
Summary of the invention
Aiming at the shortcomings existing in the above problems, the present invention provides a kind of transmission line of electricity based on ground wire induced voltage
Wave monitoring method, using after this method can monitoring distance it is longer compared with conventional method, calculate it is simple and efficient, it can be achieved that in real time prison
It surveys.
To achieve the above object, the present invention provides a kind of transmission line galloping monitoring method based on ground wire induced voltage,
It is assumed that need by measurement certain transmission line of electricity the n-th base tower ground wire on induced voltage deduce transmission line wire wave frequency,
It waves amplitude and waves position, comprising:
Step 1, in the n-th base shaft tower install recording voltage waveform oscillograph, one end Jie of oscillograph voltage probe with
It is another to terminate on tower body on a piece aerial earth wire of tower body insulation；
Step 2, oscillograph are equipped with activation threshold value, oscillograph not recording voltage waveform when route works normally；
Step 3, when conducting wire is waved, ground wire is coupled out induced overvoltage, and oscillograph is triggered and recording voltage wave
Shape；
Step 4, according to signal analysis and Theory of Electromagnetic Field, calculate the coefficient of coup between aerial earth wire and conducting wire, thus
It extrapolates waving for conducting wire and frequency and waves amplitude；
Step 5, the waveform recorded by analyzing the oscillograph being installed in different base shaft towers, determine position is waved
Position.
As a further improvement of the present invention, the activation threshold value of oscillograph is that ground wire and shaft tower insulate when route works normally
1.15 times for locating potential difference.
As a further improvement of the present invention, the voltage waveform of oscillograph record includes power frequency component and waves signal, electricity
The demodulated frequency for waving signal waveform of corrugating waves frequency for conducting wire.
Compared with prior art, the invention has the benefit that
1, what the present invention may be implemented transmission line of electricity waves monitoring；
2, monitoring distance is farther compared with conventional method, can achieve 10 grades of transmission lines of electricity or more；
3, monitoring method is simple and efficient, and round-the-clock real-time monitoring may be implemented；
4, since aerial earth wire and conducting wire have certain distance, aerial earth wire coupled voltages are smaller, and measuring device can be small-sized
Change, lower power consumption；
5, measurement is performed fully automatic, without human intervention.
Detailed description of the invention
Fig. 1 is the stream of the transmission line galloping monitoring method based on ground wire induced voltage disclosed in an embodiment of the present invention
Cheng Tu；
Fig. 2 is that overhead transmission line conductor disclosed in an embodiment of the present invention waves schematic diagram；
Fig. 3 is ground wire induction voltage waveform figure disclosed in an embodiment of the present invention；
Fig. 4 is to wave signal waveforms disclosed in an embodiment of the present invention；
Fig. 5 is singly to return overhead transmission line conductor layout drawing disclosed in an embodiment of the present invention.
In figure:
1, the n-th base shaft tower；2, the (n+1)th base shaft tower；3, aerial earth wire；4, conducting wire；5, insulator；6, oscillograph.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention is described in further detail with reference to the accompanying drawing:
The present invention provides a kind of transmission line galloping monitoring method based on ground wire induced voltage, which applies
Overhead transmission line conductor shown in Fig. 2 is waved on schematic diagram, and overhead transmission line includes: the multiple base shaft towers continuously arranged,
Such as the n-th base shaft tower 1 and the (n+1)th base shaft tower 2, aerial earth wire 3 and conducting wire 4 have been taken between the n-th base shaft tower 1 and the (n+1)th base shaft tower 2,
Aerial earth wire 3 is connected by insulator 5 and the insulation of the n-th base shaft tower 1；Its measuring principle are as follows: when transmission pressure 4 is powered and runs,
There are electromagnetic coupling between aerial earth wire 3 and conducting wire 4, generated between induced voltage, value and ground wire and each conducting wire on aerial earth wire 3
Distance it is related.When conducting wire 4 is waved, conducting wire between ground wire at a distance from change at any time, thus the sense on ground wire
It answers voltage also to change correspondingly, therefore can deduce waving amplitude, waving frequency for conducting wire by the induced voltage on measurement ground wire
And wave position.
As shown in Figure 1, 2, the present invention provides a kind of transmission line galloping monitoring method based on ground wire induced voltage, it is assumed that
It needs to deduce waving frequency, waving for transmission line wire by measuring the induced voltage on certain transmission line of electricity the n-th base tower ground wire 1
Amplitude and wave position, comprising:
S1, the oscillograph 6 that recording voltage waveform is installed in the n-th base shaft tower 1,6 one end Jie of oscillograph and tower body insulate
A common aerial earth wire 3 on, it is another to terminate on tower body；
S2, oscillograph 6 are arranged certain activation threshold value, oscillograph not recording voltage waveform when route works normally；Wherein,
The activation threshold value of oscillograph is ground wire and 1.15 times of shaft tower insulation position potential difference when route works normally；
S3, when conducting wire is waved, ground wire is coupled out induced overvoltage, and oscillograph is triggered and recording voltage waveform；
S4, according to signal analysis and Theory of Electromagnetic Field, the coefficient of coup between aerial earth wire and conducting wire is calculated, to calculate
Waving for conducting wire and waves amplitude at frequency out；Wherein, according to signal analysis and Theory of Electromagnetic Field calculate aerial earth wire and conducting wire it
Between the coefficient of coup be existing conventional calculation method, therefore its calculating process is not elaborated herein；Oscillograph record
Voltage waveform includes power frequency component and waves signal, as shown in Figure 3；The demodulated frequency for waving signal waveform of voltage waveform is
Conducting wire waves frequency, and it is as shown in Figure 4 to wave signal waveform；Conducting wire waves amplitude are as follows:
When normal operation, aerial earth wire can be indicated by the self-impedance in circuit of the earth by formula (1) are as follows:
In formula: ZmmFor the self-impedance of aerial earth wire m and ground return circuit, R is the resistance of aerial earth wire, and r is aerial earth wire
Effective radius, D0For the depth of equal value of earth current, calculation formula are as follows:
In formula: f is the frequency of electric current, unit Hz；ρ is ground resistivity, and unit is Ω m.
For overhead transmission line, mutual inductance can be calculated by formula (2) between ground wire between conducting wire.
Wherein ZmnFor the mutual inductive impedance between aerial earth wire m and transmission line of electricity n single-phase transmission line, dmnFor aerial earth wire m with it is defeated
The distance between electric line n single-phase transmission line.
As shown in figure 5, for single back transmission line, a, b, c three-phase balance, i.e. I under normal circumstancesa=α2Ib=α
Ic。Ia、Ib、IcFor the load current of a, b, c three-phase conducting wire, α=e-120j, j is imaginary unit.Induced voltage on aerial earth wire
It is induced voltage the sum of of a, b, c three-phase conducting wire to aerial earth wire, therefore the electromagnetic induction voltage E on single back line ground wire 11Such as formula
(3) shown in.
Wherein, d1a、d1b、d1cThe distance between respectively common ground wire 1 and each phase conductor, unit m.
It is assumed that phase line a is waved, and remaining phase line is not waved, then due to d1b,d1cIt is known that and E1Remembered by oscillograph
Record obtains, and can release d1aThe expression formula changed over time.It is assumed that d1a0When not waved for phase line a ground wire 1 and phase line a it
Between initial distance, pass through calculate d1a-d1a0Can with the function for obtaining throw amplitude value and changing over time, therefore available a phase
The throw amplitude value of conducting wire.
S5, the waveform recorded by analyzing the oscillograph being installed in different base shaft towers, position to position is waved；
Wherein, the waveform recorded by judging the oscillograph in different base shaft towers, finds out the position of the maximum base shaft tower of the amplitude of waving,
Position is waved to extrapolate；Meanwhile installation oscillograph can also be spaced in base shaft tower, find out maximum two bases of the amplitude of waving
The position of shaft tower, so that extrapolates conducting wire waves position in two base shaft towers or between two base shaft towers, to extrapolate
Wave position.
Embodiment:
Conducting wire is waved at certain the 50th base shaft tower of transmission line of electricity, is equipped with oscillograph on base shaft tower is three adjacent；Conducting wire
Constantly change at any time at a distance between ground wire, induced overvoltage is coupled out on ground wire, at the 53rd base shaft tower along the line, is installed on
Oscillograph in the base shaft tower is triggered and recording voltage waveform, can be with as shown in figure 3, by effective signal analysis means
Obtain waving signal waveform as shown in figure 4, and according to the coefficient of coup between ground wire and conducting wire, extrapolating the amplitude of waving is 4m, dance
Dynamic frequency is 3Hz.Simultaneously can by being positioned in conjunction with the oscillograph being installed at different shaft towers to conductor galloping position,
It extrapolates and is waved at the 50th base shaft tower.
Advantages of the present invention are as follows:
1, what the present invention may be implemented transmission line of electricity waves monitoring；
2, monitoring distance is farther compared with conventional method, can achieve 10 grades of transmission lines of electricity or more；
3, monitoring method is simple and efficient, and round-the-clock real-time monitoring may be implemented；
4, since aerial earth wire and conducting wire have certain distance, aerial earth wire coupled voltages are smaller, and measuring device can be small-sized
Change, lower power consumption；
5, measurement is performed fully automatic, without human intervention.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of transmission line galloping monitoring method based on ground wire induced voltage, which is characterized in that by measuring certain power transmission line
Induced voltage on the n-th base shaft tower ground wire of road deduces waving frequency, wave amplitude and waving position for transmission line wire, packet
It includes:
Step 1, the oscillograph that recording voltage waveform is installed in the n-th base shaft tower, one end Jie of oscillograph voltage probe and tower body
It is another to terminate on tower body on a piece aerial earth wire of insulation；
Step 2, oscillograph are equipped with activation threshold value, oscillograph not recording voltage waveform when route works normally；
Step 3, when conducting wire is waved, ground wire is coupled out induced overvoltage, and oscillograph is triggered and recording voltage waveform；
Step 4, according to signal analysis and Theory of Electromagnetic Field, the coefficient of coup between aerial earth wire and conducting wire is calculated, to calculate
Waving for conducting wire and waves amplitude at frequency out；
Step 5, the waveform recorded by analyzing the oscillograph being installed in different base shaft towers, position to position is waved.
2. the transmission line galloping monitoring method as described in claim 1 based on ground wire induced voltage, which is characterized in that recording
The activation threshold value of instrument is ground wire and 1.15 times of shaft tower insulation position potential difference when route works normally.
3. the transmission line galloping monitoring method as described in claim 1 based on ground wire induced voltage, which is characterized in that recording
The voltage waveform of instrument record includes power frequency component and waves signal, and the demodulated frequency for waving signal waveform of voltage waveform is to lead
Line waves frequency.
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| CN108801442B true CN108801442B (en) | 2019-08-23 |
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| CN114396860B (en) * | 2021-12-06 | 2023-05-02 | 清华大学 | Method and device for monitoring sag during capacity expansion of power transmission line based on ground wire electromagnetic signals |
| CN114396859B (en) * | 2021-12-06 | 2023-04-25 | 清华大学 | Overhead line windage yaw monitoring method and device based on ground wire electromagnetic signals |
| CN114384352B (en) * | 2021-12-06 | 2023-09-19 | 清华大学 | Overhead line icing monitoring method and device based on ground wire electromagnetic signals |
| WO2023103278A1 (en) * | 2021-12-06 | 2023-06-15 | 清华大学 | Online monitoring method for position information of conducting wire of power transmission line based on electromagnetic signal of ground wire |
| CN114295196B (en) * | 2021-12-06 | 2022-09-16 | 清华大学 | Overhead line galloping positioning method and device based on ground wire electromagnetic signals |
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| CN202004450U (en) * | 2011-02-28 | 2011-10-05 | 河北省电力勘测设计研究院 | Nighttime recognition device for electric transmission line |
| AU2012357658B2 (en) * | 2011-12-23 | 2015-02-26 | Dx Tech Pty Ltd | Fault detection system |
| CN103235241A (en) * | 2013-04-27 | 2013-08-07 | 国家电网公司 | Thunder and lightning electromagnetic wave distribution monitoring device for electric power line |
| CN204359426U (en) * | 2014-12-29 | 2015-05-27 | 北京国网富达科技发展有限责任公司 | Lead wire and earth wire in transmission line waves standard set-up |
| CN204669090U (en) * | 2015-06-17 | 2015-09-23 | 孙超 | A kind of overhead transmission line intelligent monitoring device |
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