CN108761368A - Aeolian vibration for transmission line of electricity monitors calibration method - Google Patents
Aeolian vibration for transmission line of electricity monitors calibration method Download PDFInfo
- Publication number
- CN108761368A CN108761368A CN201810386313.3A CN201810386313A CN108761368A CN 108761368 A CN108761368 A CN 108761368A CN 201810386313 A CN201810386313 A CN 201810386313A CN 108761368 A CN108761368 A CN 108761368A
- Authority
- CN
- China
- Prior art keywords
- vibration
- transmission line
- electricity
- frequency
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
A kind of aeolian vibration for transmission line of electricity monitors calibration method, includes following steps：1) installation calibrating circuit；2) monitoring device is initialized；3) it is asked when sending out school, work order is sent to acquisition module；4) start the sensor and communication module power supply in transmission line of electricity aero-vibration monitoring device；5) in computing electric power line conducting wire vibration frequency and amplitude；6) result after calculating is calibrated, the error amount after being calibrated.The present invention carries out periodic reinvestigation in such a way that circuit is verified in increase to monitoring device, can realize that transmission line of electricity aero-vibration monitoring device is calibrated under site environment, it is ensured that the reliability of monitoring device measurement data.
Description
Technical field
The present invention relates to transmission line of electricity technical field, transmission line of electricity aeolian vibration monitoring dress under especially a kind of site environment
Set calibrating installation.
Background technology
In power generation industry, used general purpose test equipment has the input/output interface of standard, there is corresponding meter
Vertification regulation or calibrating standard are measured, is comparatively easier to realize the automation of calibrating or calibration.And for special survey
Equipment is tried, to realize that the automation difficulty of calibration is bigger, such as transmission line of electricity aeolian vibration monitored under environment at the scene
Cheng Zhong, often using bending amplitude of vibration method as the standard method for measuring ground wire aeolian vibration；Electric wire is measured first away from wire clamp to go out
Bending amplitude of the electric wire relative to wire clamp at mouth 89mm, and curved answer is moved in wire clamp exit to calculate conducting wire with this value size
Become, the standard method as measure traverse line vibration.This standard is the measurement method using relative amplitude, to weigh conducting wire by micro-
The dynamic extent of injury of wind shake, in practice it has proved that be the practical approach for measuring conductor vibration at suspension clamp.It is logical in actually measuring
It crosses and is carried out on transmission line of electricity, this mode is referred to as upside-down mounting vibration measuring method, monitoring device ontology is fixed on distance
It at wire clamp 89mm, and senses guide wheel and is then fixed on wire clamp attachment, this is because in practical engineering application, wire clamp itself is often
Plastic mattress or rubber pad, this can bring inconvenience to installing monitoring device ontology by wire clamp, therefore upside-down mounting vibration measuring method quilt at present
It is widely used.It is that can be used to assess the degree of fatigue of conducting wire by moving bending strain combination vibration frequency.Therefore, transmission line of electricity gentle breeze
Vibration monitoring is mainly two parameters of amplitude and frequency for monitoring conductor vibration.
According to State Grid Corporation of China company standard Q/GDW 245-2010《The general skill of overhead transmission line on-line monitoring system
Art condition》, according to the type of tested grounded-line, ranging from one of following two kinds of the amplitude measurement of aeolian vibration collecting unit.(1)
0~0.6mm (p-p)；(2) 0~1.3mm (p-p).Frequency measurement range is at least 0~150Hz.Composition error should be less than
10%.According to Q/GDW 245-2010《Transmission line of electricity aero-vibration monitoring device technical specification》, aeolian vibration on-line monitoring dress
It sets according to JJG 676-2000《Work vibration meter vertification regulation》Middle test condition and method are calibrated：Amplitude nonlinearity
Point should be no less than 6, and be evenly distributed in whole measurement range (including maximum vibration amplitude)；The calibration point of frequency response is many
7, and (including frequency response upper limit) is distributed in entire measurement range.
Simultaneously as aero-vibration monitoring device is generally deployed on the transmission line of electricity of Great span, installation site is higher, and
And it will not periodically remove and be calibrated again mostly after installing.Therefore, it is impossible to be supervised to transmission line of electricity aeolian vibration using conventional method
It surveys device and carries out field calibration.Therefore, it is necessary to transmission line of electricity aero-vibration monitoring device calibrating installations under a kind of site environment.
Invention content
It is an object of the invention to provide a kind of aeolian vibrations for transmission line of electricity to monitor calibration method, by increasing core
Look into the mode of circuit and periodic reinvestigation carried out to monitoring device, can realize under site environment transmission line of electricity aero-vibration monitoring device into
Row calibration, it is ensured that the reliability of monitoring device measurement data.
It is realized the purpose of the present invention is technical solution in this way, the calibration method includes following steps：
1) the installation calibrating circuit in aeolian vibration monitoring system, the calibration circuit include acquisition module, verify mould
Block, data processing module, power module and communication module, the acquisition module, verification module, power module, communication module are equal
It is connect with the data processing module；
2) transmission line of electricity aero-vibration monitoring device is initialized；
3) it is asked when transmission line of electricity aeolian vibration monitoring system sends out school by communication module to data processing module, data
When processing module receives school after request, work order is sent to acquisition module；
4) start the sensor and communication module power supply in transmission line of electricity aero-vibration monitoring device；
5) in computing electric power line conducting wire vibration frequency and amplitude；
6) result after calculating is calibrated, the error amount after being calibrated.
Further, the specific mounting structure that circuit is calibrated described in step 1) is as follows：
The acquisition module includes the cantilever beam sensor being arranged on transmission pressure to be measured, general foil gauge, fixation
Snap ring, transfer beam；Cantilever beam sensor one end is connect by fixing clasp with transmission pressure, the cantilever beam sensor other end and biography
Power beam connects, and transfer beam is set to by idler wheel and conductive contact, general foil gauge on cantilever beam sensor, and cantilever beam is set to
Sensor be set to through-hole, general foil gauge is set to through hole；The verification module includes verifying foil gauge, the core
Foil gauge is looked into be symmetrically disposed on cantilever beam sensor with general foil gauge；Verify foil gauge and general foil gauge respectively with switching
Switch connection；The switching switch is connect with data processing module.
Further, the vibration frequency and magnitude determinations method of conducting wire use in the step 5)：Peak-to-peak value method, curve matching
Peak-to-peak value method, quick Fourier transformation method afterwards.
Further, the operation principle of the peak-to-peak value method is as follows：The peak-to-peak value of tracer signal determines the number of vibration, this
Method determines whether the point is maximum point or smallest point by comparing the sampled value that the sampled value of certain 1 point is put with its side.
Further, the peak-to-peak value method operation principle after the curve matching is as follows：
Sensor, which is affected by the external environment, makes measurement data have more noise signal, these noise signals shake to analysis gentle breeze
It is dynamic to have a great impact；Curve-fitting method can utilize sampling to be worth to a smooth curve, effectively filter out noise signal, here
Using least square fitting curve；
Existing one group of acceleration sampled data (xj, yj), wherein j=0,1,2 ..., n；n∈N；If polynomial fit function
For formula (2)；
According to functionWith discrete data yjError sum of squares obtained by formula (3)；
In formula, m indicates (m+1) first system of linear equations；I=0,1,2 ..., m；
Determine function coefficients ajSo that functionWith discrete data yiError sum of squares it is minimum, enable Formula (4) can be obtained；
Take S to a according to thisjAsk local derviation, arrangement that can obtain one (m+1) first system of linear equations, solving equations can find out system undetermined
Number aj, and then can determine fitting function.
Further, any sequential continuously measured or signal, may be expressed as the unlimited of different frequency sine wave signal
Superposition；Quick Fourier transformation is calculated different sinusoidal in the signal using the original signal directly measured in a manner of cumulative
Frequency, amplitude, the phase of wave signal；
The operation principle of the quick Fourier transformation method is as follows：
It is 1024Hz, 512 samples being obtained by average value processing that original signal, which contains sample frequency, to these samples into
The quick Fourier transformation that 512 points of row obtains 512 points of sequence of complex numbers, each plural number can indicate signal in a certain frequency
Under feature, such as formula (5)；
In formula, flFor signal frequency；L represents at first point, l=1,2 ..., N；N indicates quick Fourier transformation points；fs
For sample frequency；
The modulus value of the point is exactly the amplitude characteristic under the frequency, is obtained by formula (6)；
In formula, A is signal amplitude；A, b is respectively real and imaginary part；
Aeolian vibration signal can quickly obtain the frequency of vibration signal after quick Fourier transformation as the above analysis
Rate and amplitude.
Further, the calibration equation in the step 4) is as follows：
Wherein, εb：The dynamic bending strain in wire clamp exit, unit are μ ε；d：The outermost strands diamond-mesh of conducting wire, unit are
mm；Yb：Wire clamp, which exports, is bent amplitude, unit mm at 89mm；P2=T/ (EImin), a=89mm；T：Conducting wire is average when experiment
Motion tension, unit Nmm2。
By adopting the above-described technical solution, the present invention has the advantage that：
The present invention can monitor the amplitude and frequency of conductor vibration in transmission line of electricity aero-vibration monitoring device, with amplitude and
The size of frequency come calculate conducting wire wire clamp exit dynamic bending strain, as measure traverse line vibration calibration method.Pass through biography
Sensor verifies pattern, and the Measurement reliability that sensor unit can be acquired to aero-vibration monitoring device is assessed.Pass through zero
Point verification pattern, can to entire aero-vibration monitoring device, without acquisition sensor unit, reliability assessed.FFT
Algorithm calculating frequency is more accurate, and peak-to-peak value method calculated amplitude is more accurate, therefore uses both methods measurement amplitude respectively
And frequency, it can accurately obtain the frequency and amplitude of conductor vibration.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification and right
Book is sought to realize and obtain.
Description of the drawings
The description of the drawings of the present invention is as follows.
Fig. 1 is the connection diagram for calibrating circuit；
Fig. 2 is the structural schematic diagram of acquisition module；
Fig. 3 is to verify resistance schematic diagram；
Fig. 4 is the position view of beam type displacement sensor foil gauge；
Fig. 5 is two-arm differential bridge circuit diagram；
Fig. 6 is full-bridge circuit figure；
Fig. 7 is direct current unbalanced bridge processing circuit figure；
Fig. 8 is the schematic diagram of power module；
Fig. 9 is the flow diagram of the present invention.
Figure 10 is the amplitude test error curve diagram of a specific embodiment.
Figure 11 is the frequency test error curve diagram of a specific embodiment.
Figure 12 is the bending amplitude of vibration method schematic diagram of a specific embodiment.
In figure, 1 is wire clamp or collet, and 2 be grounded-line, and 3 be the contact point of grounded-line and wire clamp, and 4 be bending amplitude Yb(phase
For wire clamp).
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment：
As shown in Figures 1 to 8, it is used for the aeolian vibration monitoring calibration circuit of transmission line of electricity,
It includes：Acquisition module verifies module, data processing module, power module and communication module；The acquisition mould
Block, verification module, power module, communication module are connect with the data processing module；
The acquisition module includes the cantilever beam sensor being arranged on transmission pressure to be measured, general foil gauge, fixation
Snap ring, transfer beam；
Described cantilever beam sensor one end is connect by fixing clasp with transmission pressure；
The cantilever beam sensor other end is connect with transfer beam；The transfer beam passes through idler wheel and conductive contact；
The general foil gauge is set on cantilever beam sensor；
The cantilever beam sensor that is set to has been set to through-hole；The general foil gauge is set to through hole.
Acquisition module is mainly a beam type displacement sensor.The displacement sensor is measure traverse line vibration amplitude frequency
The key of rate, beam type displacement sensor are in close contact with conducting wire, and displacement sensor is bent with conductive line bends, uses cantilever beam
The amount of deflection of formula displacement sensor carrys out the amplitude of equivalent conductor vibration, to the amplitude and frequency of measure traverse line.
Beam type displacement sensor is the small strain that cantilever beam is determined using the variable quantity of foil gauge resistance value, to
The size of power is determined using the relationship between power, forced area and strain, and then acquires the amount of deflection of cantilever beam sensor.Strain
The variation of piece resistance value can be acquired by subsequent processing circuit.As shown in Fig. 2, fixing clasp is fixing end, the idler wheel of front end
It is tightly contacted with conducting wire, after roller stress, transfer beam deforms upon, electric by being attached to the metal of rear end two through hole outer surface at this time
Hinder the amount of deflection that foil gauge measures cantilever beam.
The verification module includes verifying foil gauge, and the verification foil gauge is symmetrically disposed on cantilever beam with general foil gauge
On sensor；
The foil gauge of verifying is used to obtain the vibrational excitation on transmission pressure simultaneously with general foil gauge；
The verification foil gauge is connected with switching switch respectively with general foil gauge；The switching switch and data processing mould
Block connects.
It is to ensure the nucleus module of transmission line of electricity aero-vibration monitoring device data reliability to verify module.Transmission line of electricity is micro-
The acquisition module of wind vibration monitoring device monitoring unit carries out the measurement of Oscillation Amplitude using beam type displacement sensor.It is outstanding
Arm beam type displacement sensor is in close contact with conducting wire, and sensor is bent with conductive line bends, with beam type displacement sensor
Amount of deflection comes the amplitude of equivalent conductor vibration, while the amplitude of measure traverse line, frequency.Beam type displacement sensor is to utilize strain
The variable quantity of piece resistance value determines the small strain of cantilever beam, to using the relationship between power, forced area and strain come true
Determine the size of power, and then acquires the amount of deflection of beam type displacement sensor.
Project is provided on the beam type displacement sensor of monitoring device and individually verifies foil gauge, with monitoring device
The general foil gauge of itself is symmetrically placed, as shown in figure 3, the vibration that verification foil gauge bears conducting wire with general foil gauge simultaneously swashs
It encourages.Determine that verifying foil gauge or general foil gauge is used as the source of acquisition signal by switching.It, can when weather is stablized
The measurement data for verifying foil gauge and general foil gauge to be compared, beam type displacement sensor is verified in realization
Purpose.
The variation of strain is converted into resistance with respect to changes delta R/R by foil gauge, and generally use bridge circuit is resistance
Variation is converted into the variation of voltage or electric current, in order to measure, as shown in Figure 4.Project is set in the bridge circuit of monitoring device
Set the identical verification resistance R of four resistance valuess, foil gauge can be selected by switching or verifies resistance access bridge circuit.
When verifying resistance and accessing electric bridge, it may be implemented to verify the zero-bit of monitoring device (remove cantilever beam sensor) (device at this time
0) amplitude and rate-adaptive pacemaker should be.
It further include bridge circuit；The verification foil gauge is connect with bridge circuit respectively with general foil gauge；The electric bridge
Circuit is used to the foil gauge variable signal of strain is converted into resistance with respect to variable signal.There are commonly two-arm differential bridge and
Full-bridge circuit, as shown in Figure 5 and Figure 6.
The output voltage of general electric bridge is obtained by following formula.
The voltage output of two-arm differential bridge circuit is obtained by following formula.
If R when initial1=R2=R3=R4=R, a piece of a piece of compression of tension of when work, i.e. Δ R1=-Δ R2=Δ R, can
To be reduced to following formula.
Differential bridge voltage sensibility is obtained by following formula
Similarly according to four arm electrical bridge, if R when initial1=R2=R3=R4=R, Δ R when work1=Δ R4=Δ R3=-
ΔR2When=Δ R, output is obtained by following formula
The voltage sensibility of four arm electrical bridge is obtained by following formula
KU=Ui；
The high sensitivity of four arm electrical bridge (full-bridge) circuit is known by comparing its voltage sensibility, therefore selects four arm electrical bridge electricity
Road.It since the signal of sensor output is small-signal, therefore needs to be amplified it processing, for the letter for avoiding sensor from exporting
It is mixed with interference signal in number, therefore needs to carry out detection filter to it.The design of processing circuit is as shown in fig. 7, bridge output voltage
U0As the input of differential amplifier circuit, by potentiometer R when initial13Zeroing, ensures in range ability, exports UA0For positive electricity
Pressure.UA0AD samplings are carried out after in-phase amplification circuit amplifies, amplification factor is by potentiometer R14It adjusts.
Further include verifying resistance；
The verification resistance respectively with the resistor coupled in parallel in bridge circuit；
The verification resistance is identical as the resistance value of the resistance in bridge circuit；
The foil gauge and verification resistance are connect by switching switch with bridge circuit.
The data processing module includes microcontroller, operating mode selecting unit and element address selecting switch, voltage stabilizing
Power conversion module, wireless communication module interface, load switch, house dog.
Since conducting wire monitoring unit is installed on high-tension line, sensor is affected by environmental disturbances, scene needs pair
Data do the processing of some noise reduction filterings, and data processing module carries the multitask of data acquisition and data processing conversion, together
When consider two aspect factor of low-power consumption and massive store, this module use TI companies 16 chip SP430F1611 monolithics
Machine is as microcontroller.The chip uses the low voltage power supply of 1.8V~3.6V, and electric current is only under RAM data hold mode
0.1 μ A, can be at low voltage with super low-power consumption work status.Microcontroller is integrated with the ram in slice of 10KB and the Flash of 8KB,
It can support online programming and emulation, and with peripheral hardware in stronger processing capacity and abundant piece.
The power module includes energy-storage battery, electromagnetic induction taking energy coil, voltage stabilizing chip, Switching Power Supply.Power module
Design be entire check standard nucleus module, be that system is long-term, reliable, continuous work guarantee.Since check standard is
On installation overhead transmission line conductor in the wild, take electricity relatively difficult, therefore which kind of mode check standard takes power to be
It first has to solve the problems, such as.The various monitoring devices installed on conducting wire at present are generally powered using high energy-storage battery, due to battery
Complexity is replaced, has researcher to propose using novel power supply techniques such as capacitive divider power supply, laser powered sensors.Laser powered sensor is in electric current
It is applied on mutual inductor and active optics current transformer, but such power supply is not suitable for working in the wild, solar powered receipts
Weather influence is larger, and lacks long-term non-maintaining ability, and conducting wire takes the mode of energy to use electromagnetic induction principle, Neng Goufang
Just the isolated power supply of realization.By the comparison to above-mentioned several power supply mode qualities, this check standard uses the side of lithium battery
Formula gives conducting wire monitoring unit module for power supply, principle as shown in Figure 8.
In the selection of power supply voltage stabilizing chip, Switching Power Supply and low pressure difference linearity regulated power supply are common two kinds of power supply cores
Piece.When to supplying digital circuits, the higher Switching Power Supply of efficiency is mostly used, but for analog circuit, Switching Power Supply exports line
Wave is big, and the poor feature of voltage regulation factor performance is fatal, can be impacted to the overall performance of circuit.According to low voltage difference line
Property voltage-stablizer be connected to switched power output, not only realize the filtering of having chance with of switched power output, but also power supply is converted
Efficiency remains to keep under the high efficiency feature of LDO.This project chooses TPS61130 as power module of voltage regulation, battery input electricity
Pressure first passes around boost circuits and boosts to 5V, then as the input of LDO, is finally adjusted LDO outputs to stabilization by resistance
3.3V.In order to make TPS61130 performances reach best, it is laid out in Design PCB and is considered, mainly considers mainstream
Path and GND, PGND line width want sufficiently wide, and input capacitance, output capacitance and feedback divider design are enough in TPS61130
Close place.
In order to ensure that transmission line of electricity aero-vibration monitoring device can be opened with long-term work when device carries out data acquisition
Sensor and communication module power supply, after data acquisition processing and transmission, device is automatically into low-power consumption mode.
The data processing module carries out periodic reinvestigation to transmission line of electricity aero-vibration monitoring device according to the following steps：
It is initialized, confirms that ID number and various functions unit are normal；Monitoring device timing is asked when sending out school, and determination is worked as
Preceding time, sample start times, sampling number, sample frequency and acquisition time interval；
Turn on sensor and communication module power supply；
Judge operating mode：When carrying out sensor verification, first the access bridge circuit acquisition of general measure foil gauge
Then verification foil gauge is accessed bridge circuit by switching and acquires one group of signal again, finally again general by one group of signal
Measuring strain piece accesses bridge circuit and acquires one group of signal；When carrying out zero verification, verification resistance is connect by switching
Enter bridge circuit and acquires one group of signal；When carrying out general measure, then general foil gauge is accessed bridge circuit；
Relevant treatment is carried out to sampled signal and obtains frequency and amplitude data.
Frequency in the sampled signal and amplitude data processing using after peak-to-peak value method, curve matching peak-to-peak value method or
Quick Fourier transformation method carries out.
As shown in Fig. 9 to Figure 12, the aeolian vibration for transmission line of electricity monitors calibration method, is as follows：
S1：Transmission line of electricity aero-vibration monitoring device is initialized；
S2：Transmission line of electricity aero-vibration monitoring device is asked when sending out school, is determined current time, sample start times, is adopted
Number of samples, sample frequency and acquisition time interval.And judge whether to the vibration frequency of conducting wire and the data acquisition of amplitude；If
Data acquisition is carried out, then enters step S3；Conversely, then repeating to judge whether to data acquisition without data acquisition；
S3：Start the sensor and communication module power supply in transmission line of electricity aero-vibration monitoring device；The transmission line of electricity
Aero-vibration monitoring device operating mode includes sensor verification, general measure, zero verification.Mould is verified by sensor
Formula, the Measurement reliability that sensor unit can be acquired to aero-vibration monitoring device are assessed.Pattern is verified by zero,
The reliability of entire aero-vibration monitoring device (without acquisition sensor unit) can be assessed.
When weather and more stable wind scale, turn on sensor it can verify in accordance with the following steps.
(1) aero-vibration monitoring device measures one group of data (A groups) in general measure pattern；
(2) quickly adjustment aero-vibration monitoring device to sensor verifies pattern, and internal circuit automatically switches to verification and passes
Sensor measures one group of data (B groups)；
(3) quickly adjustment aero-vibration monitoring device measures one group of data (C groups) to general measure pattern.
(4) compare A groups and C group data, if amplitude and frequency measurement difference are less than 10%, continue step (5), otherwise return
It returns (1)；
(5) compare A groups and B group data, if amplitude and frequency measurement difference are less than 20%, then it is assumed that monitoring device is steady
It is fixed reliable, it otherwise can select to verify again or think to verify unqualified.
When opening zero verification pattern, the amplitude and frequency measurement of aero-vibration monitoring device should be 0.According to transmission of electricity
The technology requirement of circuit aero-vibration monitoring device, check standard have reached following technical parameter, as shown in table 1.
The technical parameter of 1 check standard of table
| Frequency measurement range | 0~150Hz |
| The frequency limits of error | ± (5% reading+5Hz) |
| Amplitude measurement range (p-p) | 1.3mm |
| The amplitude limits of error | ± (5% reading+0.05mm) |
S4：The vibration frequency and amplitude of conducting wire in computing electric power line；
S5：Result after calculating is calibrated, the error amount after being calibrated.
Working principle of the present invention is as follows：Transmission line of electricity aero-vibration monitoring device software is mainly determining operating mode
On the basis of, realize the acquisition, processing and transmission of vibration signal.Monitoring device is initialized after mounting, confirm ID number and
Various functions unit is normal.Monitoring device timing is asked when sending out school, determine current time, sample start times, sampling number,
Sample frequency and acquisition time interval.Before starting sampling, turn on sensor and communication module power supply judge operating mode.?
After having carried out sampling, relevant treatment is carried out to sampled signal and obtains frequency and amplitude data.
Calibration equation in the step S5 is as follows：
Wherein, εb：The dynamic bending strain in wire clamp exit, unit are μ ε；d：The outermost strands diamond-mesh of conducting wire, unit are
mm；Yb：Wire clamp, which exports, is bent amplitude, unit mm at 89mm；P2=T/ (EImin), a=89mm；T：Conducting wire is average when experiment
Motion tension, unit Nmm2。
On signal processing, the vibration signal of aeolian vibration is usually sinusoidal form, and acquisition module continuous sampling 1s obtains 1
After the discrete vibration signal of group, need by certain frequency and amplitude that sinusoidal signal is calculated.Calculate frequency and amplitude
Method using peak-to-peak value method, the peak-to-peak value method after curve matching, quick Fourier transformation method.
The operation principle of the peak-to-peak value method is as follows：The peak-to-peak value of tracer signal is logical to determine the number of vibration, the method
The sampled value of the sampled value for comparing certain 1 point and its side point is crossed to determine whether the point is maximum point or smallest point.This side
Method is fairly simple, and arithmetic speed is fast, but since monitoring terminal is under forceful electric power magnetic environment, and for electromagnetic interference than more serious, processing is single
Member is easy some noise signal being mistakenly considered crest value or valley value, causes frequency and amplitude that can all generate error.
Peak-to-peak value method operation principle after the curve matching is as follows：
Sensor, which is affected by the external environment, makes measurement data have more noise signal, these noise signals shake to analysis gentle breeze
It is dynamic to have a great impact；Curve-fitting method can utilize sampling to be worth to a smooth curve, effectively filter out noise signal, here
Using least square fitting curve；
Existing one group of acceleration sampled data (xj, yj), wherein j=0,1,2 ..., n；n∈N；If polynomial fit function
For formula (2)；
According to functionWith discrete data yjError sum of squares obtained by formula (3)；
In formula, m indicates (m+1) first system of linear equations；I=0,1,2 ..., m；
Determine function coefficients ajSo that functionWith discrete data yiError sum of squares it is minimum, enable Formula (4) can be obtained；
Take S to a according to thisjAsk local derviation, arrangement that can obtain one (m+1) first system of linear equations, solving equations can find out system undetermined
Number aj, and then can determine fitting function.Noise signal can be effectively filtered out by least square fitting curve, but uses multinomial
The data in 1~2 period of interception are needed to be fitted to be fitted SIN function, otherwise matched curve distortion will be very serious.Therefore such as
Fruit selects least square fitting curve, it is necessary to assure the initial data of fitting is the data in 2 periods of signal.Through overtesting
Analysis, frequency>Many logical operations are needed when 10Hz using least square method, and effect is not fine, and signal frequency is 1
When~10Hz, least square method is easy to implement and effect is than more significant.
Any sequential continuously measured or signal may be expressed as the unlimited superposition of different frequency sine wave signal；Soon
Fast Fourier transformation calculates different sine wave signals in the signal using the original signal directly measured in a manner of cumulative
Frequency, amplitude, phase；
The operation principle of the quick Fourier transformation method is as follows：
It is 1024Hz, 512 samples being obtained by average value processing that original signal, which contains sample frequency, to these samples into
The quick Fourier transformation that 512 points of row obtains 512 points of sequence of complex numbers, each plural number can indicate signal in a certain frequency
Under feature, such as formula (5)；
In formula, flFor signal frequency；L represents at first point, l=1,2 ..., N；N indicates quick Fourier transformation points；fs
For sample frequency；
The modulus value of the point is exactly the amplitude characteristic under the frequency, is obtained by formula (6)；
In formula, A is signal amplitude；A, b is respectively real and imaginary part；
Aeolian vibration signal can quickly obtain the frequency of vibration signal after quick Fourier transformation as the above analysis
Rate and amplitude.Through experiment, fft algorithm calculating frequency is more accurate, and peak-to-peak value method calculated amplitude is more accurate, therefore uses respectively
Both methods measurement amplitude and frequency can accurately obtain the frequency and amplitude of conductor vibration.
According to State Grid Corporation of China company standard Q/GDW 245-2010《The general skill of overhead transmission line on-line monitoring system
Art condition》, according to the type of tested grounded-line, ranging from one of following two kinds of the amplitude measurement of aeolian vibration collecting unit.
(1) 0~0.6mm (p-p)；
(2) 0~1.3mm (p-p).
Frequency measurement range is at least 0~150Hz.
Composition error should be less than 10%.
It is detected experiment in certain measurement centre, test data is as shown in table 2, table 3 and Figure 10, Figure 11.Test product one is shared
Two Measurement channels, wherein channel 1 are general measure channel, corresponding " test product indicating value 1 "；Channel 2 is to verify channel, corresponding " examination
Product indicating value 2 ".
As shown in Figure 10, two channel amplitude measurement errors of test product are respectively less than the limits of error.As shown in Figure 11, test product
Two channel frequence measurement errors are respectively less than the limits of error.Wherein, 1 limits of error of test product indicating value and test product indicating value 2
The limits of error overlap.
In conclusion the performance of check standard meets design requirement.
The amplitude calibration data (p-p) of 2 check standard of table
| Serial number | Amplitude standards value (mm) | Test product indicating value 1 (mm) | Test product indicating value 2 (mm) |
| 1 | 0.13 | 0.122 | 0.125 |
| 2 | 0.26 | 0.244 | 0.246 |
| 3 | 0.52 | 0.523 | 0.533 |
| 4 | 0.78 | 0.822 | 0.824 |
| 5 | 1.04 | 1.107 | 1.107 |
| 6 | 1.3 | 1.213 | 1.224 |
The frequency calibration data of 3 check standard of table
| Serial number | Frequency standard value (Hz) | Test product indicating value 1 (Hz) | Test product indicating value 2 (Hz) |
| 1 | 5.0 | 5.0 | 5.0 |
| 2 | 15.0 | 14.8 | 14.7 |
| 3 | 30.0 | 29.8 | 29.8 |
| 4 | 60.0 | 58.7 | 58.8 |
| 5 | 90.0 | 88.7 | 88.6 |
| 6 | 120.0 | 117.3 | 117.1 |
| 7 | 150.0 | 148.3 | 147.3 |
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although with reference to compared with
Good embodiment describes the invention in detail, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Right in.
Claims (7)
1. a kind of aeolian vibration for transmission line of electricity monitors calibration method, which is characterized in that the calibration method include with
Lower step：
1) the installation calibrating circuit in aeolian vibration monitoring system, the calibration circuit include acquisition module, verify module, number
According to processing module, power module and communication module, the acquisition module, verify module, power module, communication module with it is described
Data processing module connects；
2) transmission line of electricity aero-vibration monitoring device is initialized；
3) it is asked when transmission line of electricity aeolian vibration monitoring system sends out school by communication module to data processing module, data processing
When module receives school after request, work order is sent to acquisition module；
4) start the sensor and communication module power supply in transmission line of electricity aero-vibration monitoring device；
5) in computing electric power line conducting wire vibration frequency and amplitude；
6) result after calculating is calibrated, the error amount after being calibrated.
2. monitoring calibration method for the aeolian vibration of transmission line of electricity as described in claim 1, which is characterized in that in step 1)
The specific mounting structure of the calibration circuit is as follows：
The acquisition module include the cantilever beam sensor being arranged on transmission pressure to be measured, general foil gauge, fixing clasp,
Transfer beam；Cantilever beam sensor one end is connect by fixing clasp with transmission pressure, the cantilever beam sensor other end and transfer beam
Connection, transfer beam are set to by idler wheel and conductive contact, general foil gauge on cantilever beam sensor, and the biography of cantilever beam is set to
Sensor has been set to through-hole, and general foil gauge is set to through hole；The verification module includes verifying foil gauge, and the verification is answered
Become piece to be symmetrically disposed on cantilever beam sensor with general foil gauge；Foil gauge is verified to switch with switching respectively with general foil gauge
Connection；The switching switch is connect with data processing module.
3. monitoring calibration method for the aeolian vibration of transmission line of electricity as described in claim 1, which is characterized in that the step
5) vibration frequency of conducting wire and magnitude determinations method use in：Peak-to-peak value method after peak-to-peak value method, curve matching, quickly
Fourier converter techniques.
4. monitoring calibration method for the aeolian vibration of transmission line of electricity as claimed in claim 3, which is characterized in that the peak peak
The operation principle of value method is as follows：The peak-to-peak value of tracer signal determines that the number of vibration, the method are adopted by comparing certain 1 point
The sampled value that sample value is put with its side determines whether the point is maximum point or smallest point.
5. monitoring calibration method for the aeolian vibration of transmission line of electricity as claimed in claim 3, which is characterized in that the curve
Peak-to-peak value method operation principle after fitting is as follows：
Sensor, which is affected by the external environment, makes measurement data have more noise signal, these noise signals have analysis aeolian vibration
Prodigious influence；Curve-fitting method can utilize sampling to be worth to a smooth curve, effectively filter out noise signal, use here
Least square fitting curve；
Existing one group of acceleration sampled data (xj, yj), wherein j=0,1,2 ..., n；n∈N；If polynomial fit function is public affairs
Formula (2)；
According to functionWith discrete data yjError sum of squares obtained by formula (3)；
In formula, m indicates (m+1) first system of linear equations；I=0,1,2 ..., m；
Determine function coefficients ajSo that functionWith discrete data yiError sum of squares it is minimum, enableJ=0,1,
2 ..., n；Formula (4) can be obtained；
Take S to a according to thisjAsk local derviation, arrangement that can obtain one (m+1) first system of linear equations, solving equations can find out undetermined coefficient aj,
And then it can determine fitting function.
6. monitoring calibration method for the aeolian vibration of transmission line of electricity as claimed in claim 3, which is characterized in that any continuous
The sequential or signal of measurement may be expressed as the unlimited superposition of different frequency sine wave signal；Quick Fourier transformation utilizes
The original signal directly measured calculates frequency, amplitude, the phase of different sine wave signals in the signal in a manner of cumulative；
The operation principle of the quick Fourier transformation method is as follows：
Original signal contains 512 samples that sample frequency is 1024Hz, is obtained by average value processing, is carried out to these samples
512 points of quick Fourier transformation obtains 512 points of sequence of complex numbers, each plural number can indicate signal under a certain frequency
Feature, such as formula (5)；
In formula, flFor signal frequency；L represents at first point, l=1,2 ..., N；N indicates quick Fourier transformation points；fsTo adopt
Sample frequency；
The modulus value of the point is exactly the amplitude characteristic under the frequency, is obtained by formula (6)；
In formula, A is signal amplitude；A, b is respectively real and imaginary part；
As the above analysis aeolian vibration signal can quickly be obtained after quick Fourier transformation vibration signal frequency and
Amplitude.
7. monitoring calibration method for the aeolian vibration of transmission line of electricity as described in claim 1, which is characterized in that the step
4) calibration equation in is as follows：
Wherein, εb：The dynamic bending strain in wire clamp exit, unit are μ ε；d：The outermost strands diamond-mesh of conducting wire, unit mm；Yb：
Wire clamp, which exports, is bent amplitude, unit mm at 89mm；P2=T/ (EImin), a=89mm；T：Conducting wire mean motion when experiment
Power, unit Nmm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386313.3A CN108761368A (en) | 2018-04-26 | 2018-04-26 | Aeolian vibration for transmission line of electricity monitors calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386313.3A CN108761368A (en) | 2018-04-26 | 2018-04-26 | Aeolian vibration for transmission line of electricity monitors calibration method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108761368A true CN108761368A (en) | 2018-11-06 |
Family
ID=64012064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810386313.3A Withdrawn CN108761368A (en) | 2018-04-26 | 2018-04-26 | Aeolian vibration for transmission line of electricity monitors calibration method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108761368A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525693A (en) * | 2020-05-06 | 2020-08-11 | 全球能源互联网研究院有限公司 | Method, device and system for monitoring vibration state of power transmission line |
| CN112085787A (en) * | 2020-07-20 | 2020-12-15 | 中国矿业大学 | Monocular vision-based hoisting steel wire rope spatial vibration measurement method |
| CN113009399A (en) * | 2021-02-04 | 2021-06-22 | 国网湖南省电力有限公司 | Method for on-site checking application effect of transformer voiceprint monitoring device |
-
2018
- 2018-04-26 CN CN201810386313.3A patent/CN108761368A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525693A (en) * | 2020-05-06 | 2020-08-11 | 全球能源互联网研究院有限公司 | Method, device and system for monitoring vibration state of power transmission line |
| CN112085787A (en) * | 2020-07-20 | 2020-12-15 | 中国矿业大学 | Monocular vision-based hoisting steel wire rope spatial vibration measurement method |
| CN112085787B (en) * | 2020-07-20 | 2024-04-23 | 中国矿业大学 | Method for measuring space vibration of hoisting steel wire rope based on monocular vision |
| CN113009399A (en) * | 2021-02-04 | 2021-06-22 | 国网湖南省电力有限公司 | Method for on-site checking application effect of transformer voiceprint monitoring device |
| CN113009399B (en) * | 2021-02-04 | 2022-12-27 | 国网湖南省电力有限公司 | Method for on-site verification of application effect of transformer voiceprint monitoring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108761368A (en) | Aeolian vibration for transmission line of electricity monitors calibration method | |
| CN102116807B (en) | Three-dimensional power frequency electric field measurement method and device capable of correcting distortion of electric field | |
| CN106597351B (en) | A kind of implementation method of pair of electric energy meter checking device on-line real time monitoring | |
| CN106500900A (en) | A kind of Cable force measuring device and its measuring method | |
| CN108088552A (en) | Transmission line of electricity aero-vibration monitoring device calibrating installation under a kind of site environment | |
| CN105911499A (en) | Ultrasonically local discharging metering system under onsite environment and method | |
| CN105378492A (en) | Apparatus and method for measuring electrical properties of matter | |
| CN104296786A (en) | Digital bridge capacitive measuring module | |
| CN102435973A (en) | Calibration apparatus of capacitive equipment insulation on-line monitoring system and method thereof | |
| CN109188067A (en) | Wire current measuring device and method | |
| CN113721071A (en) | System and method for measuring non-intrusive voltage to ground | |
| CN114487557A (en) | Non-invasive voltage measuring device | |
| CN106233135B (en) | Using the structural healthy monitoring system of electromechanical resistance technique | |
| Chattopadhyay et al. | Modification of the Maxwell–Wien bridge for accurate measurement of a process variable by an inductive transducer | |
| CN205374585U (en) | Current collection device | |
| CN101982731B (en) | Flexible film microwave strain sensor | |
| CN106908688A (en) | A kind of portable power transformer winding failure real-time diagnosis equipment | |
| CN108375415A (en) | Transmission line of electricity aero-vibration monitoring device calibration method under a kind of site environment | |
| CN206593749U (en) | A kind of field calibration system for magnetoelectric sensor | |
| CN110085018A (en) | A kind of vibration signal wireless acquisition device and wireless acquisition system | |
| CN205015079U (en) | Little wind vibration of transmission line moves monitoring devices | |
| CN106643637B (en) | Inspection type principal strain measurement method for vibration measurement | |
| CN212133854U (en) | On-line vibration monitoring device with adjustable sensor mounting position | |
| CN208984739U (en) | A kind of E-field telemetry system based on capacitor amendment principle | |
| CN108398185A (en) | A kind of vibrating sensor on-line calibration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181106 |
|
| WW01 | Invention patent application withdrawn after publication |