CN106404160A - Power transmission line monitoring device metering system and method in field environment - Google Patents
Power transmission line monitoring device metering system and method in field environment Download PDFInfo
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- CN106404160A CN106404160A CN201610514490.6A CN201610514490A CN106404160A CN 106404160 A CN106404160 A CN 106404160A CN 201610514490 A CN201610514490 A CN 201610514490A CN 106404160 A CN106404160 A CN 106404160A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
Abstract
The invention discloses a power transmission line monitoring device metering system in a field environment. The system includes an excitation module, a vibration test module, a test interface module and a vibration control instrument; the excitation module is used for providing a vibration source for an on-line monitoring device; the vibration test module is used for detecting parameters of vibration of the on-line monitoring device excited by the vibration source; and the test interface transmits measured data to the vibration control instrument for data processing. The power transmission line monitoring device metering system in the field environment provided by the invention can enhance quality control of power transmission line breeze vibration on-line monitoring device in a lab environment, pushes reliable and effective development of state maintenance, improves a capability of technical control of state maintenance measurement equipment, enhances supervision of accuracy and reliability of the measured data of the power transmission line breeze vibration on-line monitoring device, effectively improves accident pre-judging and troubleshooting capability, and improves the safety production level and maintenance work efficiency.
Description
Technical field
The present invention relates to Application of Power Metering Instruments field, the metering of power transmission line monitoring device under particularly a kind of site environment
Modular system.
Background technology
When wire is subject to a gentle wind springing up, periodic vibration, referred to as aeolian vibration will be produced.It is characterized in that amplitude is little, typically
Less than 10mm；Frequency range is (5-100) Hz, and the vibration shape is sinusoidal beating wave；Vibration probability very big it is considered that wire always
It is in aeolian vibration state.Landform residing for circuit and span size are larger with aeolian vibration relation.Big span cross a river (extra large) circuit
Vibration is stronger.Wire clamp exit particularly on wire, due to being chronically at tortuous state, if not taking any vibration protection,
Very big dynamic bending strain will be produced in strands, lead to fatigue stranded, affect line security.
Power department has carried out the technology that transmission line of electricity aeolian vibration is carried out with on-line monitoring and the research of device at present,
For the vibratory response of measure traverse line, understand the actual vibration level of wire, judge whether vibration is qualified.Once finding vibration water
Flat exceeded, corresponding vibration protection can be adopted, stop wire from producing or tired stranded, the service life of extension lead of aggravation,
The effect of installing simulation device can be evaluated simultaneously.Therefore, transmission line of electricity aeolian vibration on-Line Monitor Device is to Vibration Condition
Measurement result affect to a great extent power department whether and how select suitable vibration protection it is necessary to have higher can
By property.
But the reliability to conductor vibration situation measurement result of the on-Line Monitor Device of transmission line of electricity aeolian vibration at this stage
Property also cannot be effectively ensured.Reason is, although much having the calibration for vibration at present, mainly or for vibration
Collecting unit is that vibrating sensor is calibrated.These methods are applied to common vibrating sensor, can not be directly to whole
Individual aeolian vibration on-Line Monitor Device is calibrated.Common vibrating sensor is often installed on a datum level, its measurement
Amplitude is relatively static with one object of reference, and the amplitude that aero-vibration monitoring device sensor is measured be monitoring point relatively with
The bending amplitude of wire clamp, and it is not only the absolute amplitude of monitoring point itself.Therefore, it is necessary to existing vibrating sensor school
Quasi- method and device improves, and develops the measurement standard for aeolian vibration on-Line Monitor Device, thus being effectively ensured micro-
The reliability of wind vibration on-line monitoring device measurement result.
Realize the calibration in laboratory environments to aeolian vibration on-Line Monitor Device, to aeolian vibration on-Line Monitor Device
The lifting of measurement data accuracy and reliability is still not big.Reason is, site environment and laboratory environment have greatly
Difference, the such as interference such as temperature, humidity, electromagnetic interference and radiation easily causes the change of measurement error, and site environment is to electric
The impact of device.Meanwhile, as Fig. 1-1.China in aeolian vibration on-line monitoring field, in " under onsite application environment " measurement data
Accuracy and reliability aspect, however it remains that performance parameter is uneven, the low problems of standardization level, very big
The standardization of aeolian vibration on-line monitoring technique, standardization, practical development be have impact on degree.Fig. 1-1 is site environment pair
The impact source of tested device；
Monitoring device is carried out with have larger difference with the calibration operation under laboratory environment under site environment.In reality
Test calibration under room environmental can not reaction monitoring device completely practical operation situation.
At the scene to on-Line Monitor Device measurement data accuracy method for evaluating reliability, situ metrology mark under use environment
The research work of standard apparatus and check standard is domestic to yet there are no development.Main at present in the magnitude tracing system of on-Line Monitor Device
Have State Grid Corporation of China's company standard file can foundation, most of work all do not carry out.Therefore, it is necessary to research aeolian vibration
On-Line Monitor Device, in the calibration of " under site environment " or check method, is developed for aeolian vibration on-Line Monitor Device " existing
Under environment " measurement standard or check standard, thus aeolian vibration on-Line Monitor Device measurement result be effectively ensured can
By property.
Transmission line of electricity on-line monitoring technique is under conditions of the equipment that do not affect runs, by being directly installed on transmission line of electricity
On monitoring device, the characteristic quantity of circuit running status is carried out with continuous or time recording.Transmission line of electricity on-line monitoring technique is
The important component part of link of transmitting electricity in intelligent grid construction, is to realize Condition-based Maintenance of Transmission Line, lifting transmission line safety
The important technical of operation level.At present, on-line monitoring device for transmission line can be divided into electric information, mechanical and running environment
Class etc., main monitoring parameter include voltage, electric current, electric discharge, thunderbolt, aeolian vibration, wave, icing, sag, tension force, shaft tower incline
Tiltedly, meteorology, filth, image/video etc., more comprehensively covers the transmission lines of electricity such as wire, ground wire, gold utensil, insulator, shaft tower
Infrastructure conditions Ambient parameter.
Transmission line of electricity on-line detecting system generally comprises monitoring means, on-line monitoring base station, monitoring management platform etc., is allusion quotation
The two grade network structure of type.Its work process is as follows：Monitoring means are installed on lead wire and earth wire, insulator, shaft tower, in real time or regularly
By the status data of controlled monitoring device and weather environment information, by wireless sensor network send to be contained on shaft tower
Line monitoring base station, base station is sent information data to monitoring management platform by being wirelessly transferred communication network again, and monitoring management is put down
Platform carries out to information storing, analyzes and processes, shows and early warning.Monitoring means can also send control instruction, by monitoring base station
Monitoring means are controlled to carry out data acquisition, or the working condition changing monitoring means.
Existing apparatus price is sufficiently expensive, and due to the impact of the factors such as distance, weather, whole measurement accuracy and application model
Enclose and be very limited it is difficult to promote the use of.
Accordingly, it would be desirable to power transmission line monitoring device metering system under a kind of site environment.
Content of the invention
It is an object of the invention to provide power transmission line monitoring device metering system under a kind of site environment.
The purpose of the present invention is realized by such technical scheme：
Power transmission line monitoring device metering system under a kind of site environment that the present invention provides, including exciting module, vibration measuring
Module, test interface and vibration controller；
Described exciting module is used for providing vibration source to on-Line Monitor Device；Described vibration measuring module is used for detecting on-line monitoring
Device is in the parameters of vibration source institute excited vibration；Data transfer is entered line number to vibration controller by described test interface
According to process.
Further, described exciting module includes vibration table, sensor, vibration controller, power amplifier and cooling system；
Sensor is provided with described vibration table be used for obtaining excited vibration parameter；Described vibration controller is with sensor even
Connect；Described power amplifier is connected with vibration controller；Described cooling system is connected with vibration table and power amplifier respectively.
Further, described vibration table include support, central magnetic pole, magnetic cylinder bottom, magnet exciting coil, driving coil, magnetic cylinder cap, on
Cover circle, moving-coil, ring-type air gap and stage body；
Described stage body is arranged on support, and described magnet exciting coil is arranged on stage body, described magnet exciting coil and driving coil
Between be provided with ring-type air gap, described driving coil is arranged on stage body, and described magnetic cylinder cap is arranged on stage body, described upper cover circle
It is arranged on magnetic cylinder cap, described moving-coil is arranged on upper cover circle.
Further, described test interface includes analog conducting wire and base；Analog conducting wire is connected with vibration table base through base.
Further, described vibration controller is operated according to the default vibration control method that gradually approaches, described gradually
Approach vibration control method specifically to realize using following steps：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is defeated
Go out the output valve of signal generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
Present invention also offers power transmission line monitoring device metering method under a kind of site environment, comprise the following steps：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is defeated
Go out the output valve of signal generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
Due to employing technique scheme, the present invention has the advantage that：
Power transmission line monitoring device metering system under the site environment that the present invention provides, it is right in laboratory environments to strengthen
The quality management and control of transmission line of electricity aeolian vibration on-Line Monitor Device, promotes reliable, effective development of repair based on condition of component work.It is right to improve
Transmission line of electricity aeolian vibration on-Line Monitor Device measurement data accuracy, the technology management and control ability of reliability.By based on metering
Ensure the transmission line of electricity aeolian vibration on-Line Monitor Device measurement data accuracy of solution principle, reliability evaluation key technology and
The research of standard set-up, will improve the technology management and control ability to repair based on condition of component measurement equipment, strengthens to transmission line of electricity aeolian vibration
The accuracy of on-Line Monitor Device measurement data and the supervision of reliability, effectively improve accident anticipation and investigation ability, improve peace
The full level of production and service work efficiency.
Other advantages of the present invention, target and feature will be illustrated to a certain extent in the following description, and
And to a certain extent, will be apparent to those skilled in the art based on to investigating hereafter, or can
To be instructed from the practice of the present invention.The target of the present invention and other advantages can be realized by description below and
Obtain.
Brief description
The brief description of the present invention is as follows.
Fig. 1-1 be the present invention site environment to tested device impact source.
Fig. 2-1 is one of on-line monitoring system block diagram of the present invention.
Fig. 2-2 is the two of the on-line monitoring system block diagram of the present invention.
Fig. 3-1 is the schematic diagram of the measurement standard design of the present invention.
Fig. 3-2 is the structure chart of the standard vibration system of the present invention.
Fig. 3-3 is the schematic diagram of the vibration table of the present invention.
Fig. 3-4 is the logic schematic diagram of the power amplifier of the present invention.
Fig. 3-5 is the software function diagram of the vibration controller of the present invention.
Fig. 3-6 is the transmission function figure of the vibration controller of the present invention.
Fig. 3-7 is the flow chart gradually approaching vibration control algorithm of the present invention.
Fig. 3-8 is that the frequency of determining of the present invention calibrates flow chart.
In figure, 1 is exciting module, 2 is vibration measuring module, 3 is test interface, 4 is vibration controller；
51 be support, magnetic pole centered on 52,53 be magnetic cylinder bottom, 54 be magnet exciting coil, 55 be driving coil, 56 be magnetic cylinder
Lid, 57 be upper cover circle, 58 be moving-coil, 59 be ring-type air gap, 510 be stage body.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
As illustrated, power transmission line monitoring device metering system under a kind of site environment of the present embodiment offer, including sharp
Module of shaking 1, vibration measuring module 2, test interface 3 and vibration controller 4；
Described exciting module is used for providing vibration source to on-Line Monitor Device；Described vibration measuring module is used for detecting on-line monitoring
Device is in the parameters of vibration source institute excited vibration；Data transfer is entered line number to vibration controller by described test interface
According to process.
Described exciting module includes vibration table, sensor, vibration controller, power amplifier and cooling system；
Sensor is provided with described vibration table be used for obtaining excited vibration parameter；Described vibration controller is with sensor even
Connect；Described power amplifier is connected with vibration controller；Described cooling system is connected with vibration table and power amplifier respectively.
Described vibration table includes support 51, central magnetic pole 52, magnetic cylinder bottom 53, magnet exciting coil 54, driving coil 55, magnetic cylinder cap
56th, upper cover circle 57, moving-coil 58, ring-type air gap 59 and stage body 510；
Described stage body is arranged on support, and described magnet exciting coil is arranged on stage body, described magnet exciting coil and driving coil
Between be provided with ring-type air gap, described driving coil is arranged on stage body, and described magnetic cylinder cap is arranged on stage body, described upper cover circle
It is arranged on magnetic cylinder cap, described moving-coil is arranged on upper cover circle.
Described test interface includes analog conducting wire and base；Analog conducting wire is connected with vibration table base through base.
Described vibration controller is operated according to the default vibration control method that gradually approaches, and described gradually approaches vibration
Control method specifically to be realized using following steps：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is defeated
Go out the output valve of signal generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
The present embodiment additionally provides power transmission line monitoring device metering method under a kind of site environment, comprises the following steps：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is defeated
Go out the output valve of signal generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
Embodiment 2
The overhead transmission line aeolian vibration on-line detecting system that the present embodiment provides, is used bending amplitude of vibration method as measurement
The standard method of ground wire aeolian vibration.Definition such as Fig. 2 of bending amplitude of vibration method, measures electric wire electric wire phase at wire clamp outlet 89mm
For the bending amplitude of wire clamp, and the dynamic bending strain in wire clamp exit for the wire is calculated with this value size, as measure traverse line
The standard method of vibration.Using the measuring method of relative amplitude, to weigh wire be subject to aeolian vibration the extent of injury in practice it has proved that
It is the practical approach of conductor vibration at measurement suspension clamp.
The parameter of the aeolian vibration on-Line Monitor Device that the present embodiment provides is as follows：
Amplitude measurement scope：According to the type of tested lead wire and earth wire, under the amplitude measurement scope of aeolian vibration collecting unit is
One of two kinds of row：A) 0～0.6mm (p-p)；B) 0～1.3mm (p-p).Frequency measurement scope：Frequency measurement scope is at least 0
～150Hz.
According to Q/GDW 245-2010《Overhead transmission line on-line monitoring system general technical specifications》, on-line monitoring system
In two kinds of situation：
The first is：Data acquisition unit is provided with short-range wireless communications interfaces, for entering line number with data concentrator
According to communication, self-organizing formula can carry out corresponding self-inspection, collection, measurement, and measurement result can be transferred in data concentrator, so
Afterwards measurement result is transferred to by data handling system by electric communication networks such as GPRS/GSM/CDMA, as shown in Fig. 2-1；
One of Fig. 2-1 on-line monitoring system block diagram.
Second is：Data acquisition unit carries wireless communication interface in itself, directly passes through with data handling system
The electric communication networks such as GPRS/GSM/CDMA are communicated with data handling system.Can self-organizing formula carry out corresponding self-inspection,
Collection, measurement, and measurement result can be transferred to data handling system, as shown in Fig. 2-2；Fig. 2-2 on-line monitoring system block diagram
Two.
Transmission line of electricity aeolian vibration on-Line Monitor Device metering system is as follows：
According to Q/GDW 245-2010《Transmission line of electricity aero-vibration monitoring device technical specification》, aeolian vibration on-line monitoring
Device is 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 not
Few 7, and it is distributed in whole measurement range (including the frequency response upper limit).
Whole metrological standard unit is divided into exciting module, vibration measuring module and test interface composition.Exciting module mainly includes
One vibration table, digit counter, signal generator, power amplifier composition, are mainly used in providing a vibration source.Vibration measuring mould
Block is made up of standard transducer, amplifier, a digital voltmeter, is mainly used in measuring each ginseng of vibration source institute excited vibration
Number is as standard value.Test interface is made up of analog conducting wire and base, and analog conducting wire is connected with vibration table base through base.In order to
Reduce measurement error, using being rigidly connected.
Concrete scheme is as shown in figure 3-1.Fig. 3-1 is the schematic diagram of measurement standard design
The measurement criteria that this project proposes adopts comparison method calibration, has two key points.
1. vibration table is the core of the exciting module of measurement criteria, needs to produce a stable sinusoidal vibration, the biography of test product
Sensor probe and standard transducer measure this vibration on vibration table respectively.Vibration table in this project provides the machine of standard
Tool signal, should meet following requirement：
2. the distortion factor is little, and in 2Hz～200Hz frequency range, acceleration distortion should be less than 1%.
3. signal to noise ratio is high, typically requires signal to noise ratio to should be greater than 60dB.
4. transverse motion components are little.Sensor has transversal effect, if vibration table is except axial fortune in calibration
Dynamic outer also transverse motion components, corrected sensor will produce output signal and be superimposed upon axially defeated to this transverse motion components
In going out, introduce larger additive error.
5. frequency range will width.The frequency measurement range spans low frequency of transmission line of electricity aeolian vibration on-Line Monitor Device and in
Frequently, the calibration of whole frequency ranges is completed as far as possible on same vibration table.
6. larger thrust will be had to export.Square being directly proportional of thrust and frequency of vibration, when frequency increases it is desirable to thrust
There is bigger nargin.
7. to there is certain load-bearing capacity.
8. table vibration output will be stablized.When the frequency of vibration table and amplitude stability, the output of sensor could be stablized,
Accurate calibration result can be obtained at steady state.Acceleration instability is typically required to should be less than in a calibration process
0.5%.
9. table top will have certain rigidity and surface smoothness.Its roughness should be better than 0.8 μm, and this is general sensor institute
The normal running conditions requiring.
10. the impact to sensor for the non-vibration environment will be reduced as far as possible.Vibration table does not produce or few generation is to sensor spirit
Sensitivity influential non-vibration environment.
In comparison calibration, whether the sensitivity of standard transducer is accurately and stable, and the performance of of sensor itself
Quality how, has direct impact to calibration result.Accordingly, it would be desirable to have certain requirement or regulation to standard transducer.Specifically
Ground, should meet claimed below：
1. sensitivity must be accurately.Typically use laser absolute method or reciprocity calibration.Its reference sensitivity is calibrated not
Degree of certainty should be within 0.5%.
2. sensitivity long-time stability will be got well.I.e. within the re-testing periods, sensitivity should not have significant change.Typically require year
Degree of stability should be better than 0.5%.
3. cross sensitivity generally should be smaller than 2%.
4. the linearity should be less than 3%.
5. non-vibration environmental sensitivity is low, and such as temperature-responsive error, magnetic sensitivity, pedestal strain sensitivity etc. should be tried one's best
Ground is little.The long-term good stability such as hard ceramic material of sensing element application natural quartz or high stability and the low material of temperature effects
Material is made.
6. standard accelerometer, in calibration and use, should be calibrated together with supporting charge amplifier and use.
4.1.2 exciting module, the design of vibration measuring module
On being embodied as, exciting module and vibration measuring module can be realized by a standard vibration system, as Fig. 3-2 institute
Show.Standard vibration system is a closed-loop control system that can automatically control vibration parameters magnitude in the course of the work, mainly
Hardware includes：Vibration stage body, power amplifier, standard transducer, controller and cooling system.As shown in the figure.
Its operation principle is：Signal generator in vibration controller produces a sinusoidal signal, is put by power amplifier
Vibration table is driven greatly to produce the vibration signal of standard afterwards.The sine of the digital frequency meter receipt signal generator in vibration controller
Signal, the frequency measuring this signal is as frequency standard value.The machinery that provided that standard transducer is used for measuring vibration table is believed
Number amplitude, measurement result is as amplitude standards value.Fig. 3-2 is the structure chart of standard vibration system
Vibration table is the core of standard vibration system, and structure is as shown in Fig. 3-3.
Magnet exciting coil sets up magnetic field in vibration table stage body, and magnet exciting coil is connected with DC source, produces in belt air gap
A raw high magnetic flux.Moving-coil part, including table top, skeleton and driving coil, is suspended in the belt air gap of vibration table.Work as friendship
When stream electric current passes through driving coil, electromagnetic force can produce on the winding of driving coil so that table top produces up and down
Move back and forth, show at middle four-headed arrow as shown.The drive signal that the amount of movement of table top sends depending on vibration controller
Size and frequency and added load quality.Fig. 3-3 is the schematic diagram of vibration table
Power amplifier adopts digital (switch tubular type) to design, and is a kind of high efficiency, modularity, air-cooled power amplification
Device, after it constitutes a pilot system with the vibration table mating and vibration controller, being capable of the work of continuous effective ground.Amplifying
Use pulse modulation technology (PWM) in device, electric current can be amplified with very high efficiency.By modulated high frequency signal and will not
After necessary switching frequency filtering, smooth output waveform can be obtained.Its principle is as shown in Figure 3-4.Fig. 3-4 is power amplifier
Logic schematic diagram.
Power amplifier provides the power supply that the exciting current of vibration table stage body magnet exciting coil, power model use, mainly
Including power amplifier module, logic module and protection circuit etc..
Vibration controller is the critical component of whole standard vibration system, its mainly to signal generator, digital frequency meter,
Enumerator and each communication interface are controlled, and input controling parameter by human-computer interaction interface, realize the defeated on request of signal
Go out, complete the functions such as collection, the process of sensor output signal.
Vibration controller embedded software system can coordinate the output driving vibration table that each hardware is controlled signal, and
The output signal of collection sensor is processed, thus realizing the calibration to test product.Its major function is as in Figure 3-5.Fig. 3-5
The software function diagram of vibration controller.
System self-test is that the function of each hardware in system and physical connection are checked, to ensure that calibration process can
Safe and stable, reliably carry out.The signal that main control module is substantially carried out controlling corresponding hardware to carry out different mode occurs, frequently
The functions such as rate counting, data acquisition and process, and measurement result return human-computer interaction interface is shown, preserved and printed.
When designing vibration controller control algolithm, need to consider three problems：
1. the vibration table exciter response time.Because standard vibration system is a feedback system, as seen in figures 3-6.Reaching
Need during to the vibration parameters arranging constantly to adjust, the data collecting is fed back to system after treatment, shaken with correcting
The motion of dynamic platform.After signal generator output signal, the action of vibration table is not to change with signal at once, but has certain
Time delay, need certain response time.In figure：K (S) vibration control algorithm transmission function；Ka (S) power amplification
Device transmission function；H (S) vibration table transmission function；T (S) sensor transfer function.The biography of Fig. 3-6 vibration controller
Delivery function figure.
2. the seriality of vibration.Signal generator is usually digital, leads to its output not to be continuous, but step
Formula changes, and this will bring impact to vibration table.For this situation it is thus necessary to determine that a suitable step-length, vibration table is made to shake
During dynamic adjustment, both will not produce obvious impact, and can meet and be rapidly achieved target component requirement.
3. the limit output of signal generator.In vibration table work process, when the maximum output voltage of signal generator
When reaching maximum or minima, go back miss the mark vibration parameters, system will occur endless loop.For this situation, need
Dynamically to adjust the gain of power amplifier.
Based on these three problems, devise and gradually approach vibration control algorithm, its flow process is as shown in fig. 3 to 7.
In figure, m_freq test frequency；M_level tests vibration level；M_ampl signal generator exports；
Delta signal generator exports incremental steps；The actual vibration level of truel vibration table；Signal generator most preferably exports model
Enclose for (0.2～5).
The flow chart that Fig. 3-7 gradually approaches vibration control algorithm
In order to reach intended vibratory parameter, this algorithm is broadly divided into three parts：
1. the signal output of signal generator is increased to optimal output area lower limit.
2. calculate through system feedback, signal generator output signal is increased close to intended vibratory parameter.
3. slowly adjust to intended vibratory parameter.
Controlling the incipient stage, completing the input of the target components such as test frequency and vibration level, complete signal generator simultaneously
Initial work.In order to avoid the impact to vibration table, the output of signal generator is gradually adjusted to optimal output from zero
Lower range limit.
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area, measure vibration table
Actual vibration level, the impact to vibration table for the increase according to signal is substantially linear relationship, theoretically calculates final signal
The output of generator, this output reaches the output of signal generator during target component close to vibration table.
The output of signal generator is gradually increased to close to theory final output value, real by constantly comparing vibration table
Border vibration level and the difference of target component, adjust signal generator output size, finally make vibration reach stable target component.
In order to be able to simpler and more direct to aeolian vibration on-Line Monitor Device, this programme is more to determine frequency calibrating die using employing
Formula, that is, calibration point all selects frequency and the vibration level of fixing vibration every time.As shown in figures 3-8, Fig. 3-8 is fixed frequency calibration stream to its flow process
Cheng Tu.
The test interface increasing aeolian vibration on-Line Monitor Device is so as to can be to whole aeolian vibration on-Line Monitor Device
Calibrated.
Test interface is made up of analog conducting wire and base, and analog conducting wire is connected with vibration table base through base, using rigidity
Connect.When being calibrated, transmission line of electricity aeolian vibration on-Line Monitor Device is arranged on analog conducting wire, and adjustment sensor probe connects
Touch on vibration table.Standard transducer center and test product sensor probe are placed with vibration table centrosymmetry.For no visiting
The test product of head, can be directly installed on the rigid analog conducting wire on vibration table.
The design parameter of measurement criteria, the measurement standard of transmission line of electricity aeolian vibration on-Line Monitor Device is mainly to test product
Frequency, amplitude calibrated.
Measurement criteria using aeolian vibration on-Line Monitor Device is calibrated to aeolian vibration on-Line Monitor Device, can make
The magnitude tracing relation of on-Line Monitor Device becomes apparent from clearly, and this is the pass effectively calibrating aeolian vibration on-Line Monitor Device
Key.
Multiple schemes of tracing to the source that the present embodiment provides, can directly tracing to the source, (frequency measurement scope is to vibration table assay device
0.1Hz～5kHz, acceleration analysis scope is 0.1m/s2～1000m/s2, and uncertainty is 0.3%), meanwhile, because metering
It is amplitude and frequency respectively that standard needs the parameter traced to the source, and is measured by standard transducer and numerical frequency respectively and measures out.Wherein
Standard transducer can be according to JJG 676-2000《Work vibration meter vertification regulation》, trace to the source to the standard vibration of more high accuracy
Sensor or laser interferometer, until National primary standard.Digital frequency meter can be according to JJG349-2014《Universal counter is examined and determine
Code》Trace to the source to Hubei metrology and measurement academy's rubidium atomic frequency standard, until national time reference.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although with reference to relatively
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, the objective without deviating from the technical program and scope, and it all should be covered in the present invention
Right in the middle of.
Claims (6)
1. under a kind of site environment power transmission line monitoring device metering system it is characterised in that：Including exciting module, vibration measuring mould
Block, test interface and vibration controller；
Described exciting module is used for providing vibration source to on-Line Monitor Device；Described vibration measuring module is used for detecting on-Line Monitor Device
Parameters in vibration source institute excited vibration；Described test interface carries out data transfer to vibration controller at data
Reason.
2. under site environment as claimed in claim 1 power transmission line monitoring device metering system it is characterised in that：Described exciting
Module includes vibration table, sensor, vibration controller, power amplifier and cooling system；
Sensor is provided with described vibration table be used for obtaining excited vibration parameter；Described vibration controller is connected with sensor；
Described power amplifier is connected with vibration controller；Described cooling system is connected with vibration table and power amplifier respectively.
3. under site environment as claimed in claim 1 power transmission line monitoring device metering system it is characterised in that：Described vibration
Platform includes support, central magnetic pole, magnetic cylinder bottom, magnet exciting coil, driving coil, magnetic cylinder cap, upper cover circle, moving-coil, ring-type air gap and platform
Body；
Described stage body is arranged on support, and described magnet exciting coil is arranged on stage body, between described magnet exciting coil and driving coil
It is provided with ring-type air gap, described driving coil is arranged on stage body, described magnetic cylinder cap is arranged on stage body, described upper cover circle setting
On magnetic cylinder cap, described moving-coil is arranged on upper cover circle.
4. under site environment as claimed in claim 1 power transmission line monitoring device metering system it is characterised in that：Described test
Interface includes analog conducting wire and base；Analog conducting wire is connected with vibration table base through base.
5. under site environment as claimed in claim 1 power transmission line monitoring device metering system it is characterised in that：Described vibration
Controller is operated according to the default vibration control method that gradually approaches, and the described vibration control method that gradually approaches specifically adopts
Following steps are realizing：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is output letter
The output valve of number generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
6. under a kind of site environment power transmission line monitoring device metering method it is characterised in that：Comprise the following steps：
Setting test frequency and vibration level parameter；
Initialization signal generator；
The output of signal generator is gradually adjusted to optimal output area lower limit from zero；
Adjust power amplifier gain, so that the output of signal generator is maintained in optimal output area；
Measure the actual vibration level of vibration table；
Judge whether the output of signal generator and the difference of vibration table target component reach predetermined threshold value, if it is output letter
The output valve of number generator；
If it is not, then adjustment signal generator output size return to step reaches target component until vibration table.
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| CN109870231B (en) * | 2019-03-15 | 2023-09-26 | 浙江大学城市学院 | Automatic metering verification system and identification algorithm for vibration measuring instrument |
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