CN107543581A - Multi-functional substation framework health monitoring and damnification recognition method - Google Patents
Multi-functional substation framework health monitoring and damnification recognition method Download PDFInfo
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Abstract
The present invention relates to a kind of multi-functional substation framework health monitoring and damnification recognition method, it is characterized in that, comprise the following steps：(1) data acquisition module by the substation framework information transmission collected to structural healthy monitoring system；(2) investigated, analyzed and assessed after structural healthy monitoring system calculating processing, investigation, analysis and assessment result are sent to result output module；(3) result output module is used to show result.The present invention with timely and effective assessment switchyard structure health status and can find out framework damage information, be analyzed by investigating, draw the safety hazards in terms of switchyard structure in time by building multi-functional switchyard structure health monitoring and non-destructive tests device.Compared to traditional artificial investigation, there is time saving and energy saving, accurate, comprehensive advantage, preferably can provide guidance for power transformation O＆M and maintainer.
Description
Technical field：
The present invention relates to a kind of multi-functional substation framework health monitoring and damnification recognition method, belongs to power system fortune inspection skill
Art field.
Background technology：
At present, domestic most transformer stations mainly use ocular estimate, rebound method, ray for the damage check of power-transmission frame
The local detection method such as method, ultrasonic technology.This local detection method needs to be known a priori by the general location of structural damage, and
And requiring that detecting instrument can reach damage field, this is applicable for simple framework, but for large complicated power-transmission frame
Structure, then integrally-built damage information can not be provided, and detection efficiency is low.In recent years, computer technology, mechanics of communication
And the development of various kinds of sensors technology, building structure maintenance and management mode is investigated and analysed and is borrowed with Appearance Visual by conventional
The various modern science and technology of integrated use are gradually developed into based on the detection judgement for helping part instrument and equipment and means are detected, this
Cut to allow to carry out comprehensive monitoring and computer management and assess and become possible to.
Substation framework is the important structures in transformer substation power distribution unit place, and its security reliability directly affects power transmission and transformation and set
Standby service behaviour and transformer station and the normal operation of whole power system.In the design of framework, making, transport and installed
Cheng Zhong, framework may all occur damage and destroy.It is meanwhile environmental attack, material aging and load effect, artificial or natural
The coupling of the disaster factors such as mutation effect will inevitably lead to structure damage is accumulative and degradation resistance so that
The ability of framework resistance natural calamity, normal load and environmental activity declines, and potential safety hazard is caused to substation operation, even
Trigger catastrophic burst accident.The health status of monitoring framework in time, repairs to framework earlier damage, can either ensure
Structural behaviour, the and can extending structure life-span, while maintenance cost can also be substantially reduced.
The content of the invention：
The present invention provides a kind of multi-functional substation framework health monitoring that can effectively monitor damage and damnification recognition method.
Multi-functional substation framework health monitoring provided by the present invention and damnification recognition method, it is characterized in that, including it is as follows
Step：
(1) data acquisition module by the substation framework information transmission collected to structural healthy monitoring system；
(2) investigated, analyzed and assessed after structural healthy monitoring system calculating processing, by investigation, analysis and assess knot
Fruit is sent to result output module；
(3) result output module is used to show result.
Analog quantity, switching value information and the associated picture number of data collecting module collected transformer station in described step (1)
According to；
The analog quantity information of described collection shakes for intrinsic frequency, the displacement modes vibration shape, the camber mode of substation structure
Type and the rigidity of structure and flexibility matrix；
Switching value information is main transformer running status and transformer station's outlet running status in transformer station；
View data is power transformation structure minute elastic deformation.
Investigation, analysis and assessment include following manner in described step (2)：
(1) non-destructive tests based on intrinsic frequency：When quality and rigidity change, intrinsic frequency reduces, damping ratio
Increase；
(2) non-destructive tests based on the displacement vibration shape：1. directly relatively damage whether front and rear vibration shape change carrys out identification of damage
Produce；2. the mark amount damaged by vibration shape structural texture, by the change of mark amount or the production judged come identification of damage of its value
It is raw；3. the orthogonalization condition based on the vibration shape is come the generation of identification of damage；
Damnification recognition method based on the displacement vibration shape uses modal assurance criterion criterion MAC-modal assurance
Criterion and its improvement criterion COMAC-coordinate modal assurancecriterion；Wherein, MAC is used for weighing
The correlation between Mode Shape is measured, COMAC is used for weighing the correlation of the vibration shape in each free degree；
If for need to identifying whether structure is damaged, using COMAC；
Detect whether structure is damaged using the change of dynamic characteristic before and after MAC differentiation structural damages；
(3) non-destructive tests based on curve modal shape；The Deformation Curvature of structure and the fundamental relation of mechanical property parameters
For:
K=M/EI
In formula:M is section turn moment；If partial cleft or other damages occurs in structure, will draw in relevant local location
EI change is played, so that the curvature at this changes, causes curve modal shape localized variation；Camber mode is for part
Impaired performance is sensitive, and carrying out damage reason location according to the change of camber mode will be more accurate；
(4) non-destructive tests based on structural stiffness matrix and flexibility matrix：Structural damage can cause the increase of structural compliance,
The change of Structure Flexibility Matrix can be as the foundation of damage check；
(5) non-destructive tests based on element modal strain energy change：By the front and rear vibration shape of measurement structure damage, and by
The rigidity of structure, directly calculate the modal strain energy that can characterize structure change；When structure partial damages, part mould
Abrupt local occurs near structural damage for the state vibration shape, causes injury region modal strain energy to vary widely；Comparison structure is damaged
The front and rear modal strain energy of wound, it can substantially judge the position of damage；
The distribution of construction unit modal strain energy is related to vibration shape component corresponding to the rigidity of unit and unit；Definition structure
Element modal strain energy poor (MSEC) and element modal strain energy rate of change of the jth unit on the i-th rank mode before and after breakage
(MSECR) signatures for damage detection Δ EMS%CΔ E and η ηMS%CRespectively:
Two formulas can be drawn more than, if local damage occurs, damage location will obtain positioned at modal strain energy rate of change
At the beam element for obtaining maximum；During non-destructive tests, it is bent to draw the two dimension that signatures for damage detection MSECR changes with unit (or rod member)
Line, the position of damage will be indicated at curve mutation；Meanwhile the amplitude being mutated according to MSECR curves, it can qualitatively judge to damage
Degree.
Data acquisition module by the substation framework information transmission collected to structural healthy monitoring system, by structural health
Investigated, analyzed and assessed after monitoring system calculating processing, investigation, analysis and assessment result are sent to result output mould
Block, is shown in face of power transformation O＆M and maintainer, and for correlation engineering, personnel provide reference.Modules described separately below
Form.
Data acquisition module is installed on transformer substation framework and large scale equipment, and main function is the simulation for gathering transformer station
Amount, switching value information and dependent image data, output this to structural healthy monitoring system after treatment.
The effect of on-off value data acquisition port and analog data collection port is to gather opening for power plant and transformer station
Pass is measured and analog quantity information.For transformer station, the analog quantity information of collection is the intrinsic frequency of substation structure, displacement mould
The state vibration shape, curve modal shape and the rigidity of structure and flexibility matrix, switching value information be transformer station in main transformer running status and
Transformer station's outlet running status, view data are power transformation structure minute elastic deformation.The analog data information collected need through
Cross A/D converter (analog-digital converter) and analog quantity information is converted into switching value information, then pass to data-out port；Adopt
The switching value information collected is then conveyed directly to data-out port.The effect of data-out port be the data that will receive with
Wireless transmission method is sent to the structural healthy monitoring system positioned at power transformation master control room.Frequency acquisition be every 12 hours once.
Structural healthy monitoring system is defined as：Its internal information is obtained from the structure of operational regime with field monitoring mode
And processing data, to judge the effective ways changed with evaluation structure main performance index caused by damaging or degenerating.According to
Above-mentioned definition, structural healthy monitoring system can be divided into on-line testing, in real time analysis, damage diagnosis, state estimation and dimension
Protect 5 parts such as decision-making.
The data-in port of structural healthy monitoring system is connected with the data-out port of data acquisition module, and effect is
Receive the data message that data acquisition module is sent.Structural healthy monitoring system is the core of whole device, and effect is to structure
Detected and assessed, whether to determine structure with the presence of damage, and then judge position and the degree of damage, and structure is current
Situation, variation tendency etc. for using function and structure to damage.Because vibration characteristics are the functions of its physical parameter, structure
Damage means the change of structural physical parameter, and the change of physical parameter necessarily causes the change of vibration characteristics.It is logical
The sensing equipment crossed in structure, the vibration to structure are monitored in real time, can obtain the vibration of structure different phase
Characteristic；Change to vibration characteristics is analyzed and handled, it is possible to the situation of change of structural physical parameter is obtained, so as to
Reach the purpose of damage check.Finally, detection is sent to result output module with assessment result by output port.
As structural healthy monitoring system, as a result output module is equally installed on transformer station's master control room, for a display
Device.
As a result the input port of output module is connected with the output port of structural healthy monitoring system, and effect is to receive structure
The analysis result of health monitoring systems, and showed over the display, referred to for power transformation O＆M and maintainer.
The beneficial effects of the invention are as follows：
, can be with timely and effective assessment switchyard structure by building multi-functional switchyard structure health monitoring and non-destructive tests device
Health status and framework damage information is found out, analyzed by investigating, draw the safety hazards in terms of switchyard structure in time.Phase
Than traditional artificial investigation, there is time saving and energy saving, accurate, comprehensive advantage, preferably can be carried for power transformation O＆M with maintainer
For instructing.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment the present invention is further detailed explanation：
Fig. 1 is multi-functional switchyard structure health monitoring and non-destructive tests structure drawing of device；
Fig. 2 is data acquisition module control structure figure；
Fig. 3 is structural healthy monitoring system structure chart；
Fig. 4 is result output module control structure figure.
Specific embodiment：
As data acquisition module in Fig. 1-Fig. 4, structural healthy monitoring system and result output module three parts are formed, three
Partial hardware configuration connection diagram is as shown in Figure 1.Circle in figure represents data transmission port.
Data acquisition module by the substation framework information transmission collected to structural healthy monitoring system, by structural health
Investigated, analyzed and assessed after monitoring system calculating processing, investigation, analysis and assessment result are sent to result output mould
Block, is shown in face of power transformation O＆M and maintainer, and for correlation engineering, personnel provide reference.Modules described separately below
Form.
Data acquisition module is installed on transformer substation framework and large scale equipment, and main function is the simulation for gathering transformer station
Amount, switching value information and dependent image data, output this to structural healthy monitoring system after treatment.Its control structure is such as
Shown in Fig. 2.
The effect of on-off value data acquisition port and analog data collection port in upper figure is collection power plant and change
The switching value and analog quantity information in power station.For transformer station, the analog quantity information of collection is the intrinsic frequency of substation structure
Rate, the displacement modes vibration shape, curve modal shape and the rigidity of structure and flexibility matrix, switching value information are main transformer fortune in transformer station
Row state and transformer station's outlet running status, view data are power transformation structure minute elastic deformation.The analog data collected
Analog quantity information need to be converted to switching value information by information by A/D converter (analog-digital converter), and it is defeated to then pass to data
Exit port；The switching value information collected is then conveyed directly to data-out port.The effect of data-out port is to receive
To data sent with wireless transmission method to the structural healthy monitoring system positioned at power transformation master control room.Frequency acquisition is every 12 small
Shi Yici.
Structural healthy monitoring system is defined as：Its internal information is obtained from the structure of operational regime with field monitoring mode
And processing data, to judge the effective ways changed with evaluation structure main performance index caused by damaging or degenerating.According to
Above-mentioned definition, structural healthy monitoring system can be divided into on-line testing, in real time analysis, damage diagnosis, state estimation and dimension
Protect 5 parts (such as Fig. 3) such as decision-making.
The data-in port of structural healthy monitoring system is connected with the data-out port of data acquisition module, and effect is
Receive the data message that data acquisition module is sent.Structural healthy monitoring system is the core of whole device, and effect is to structure
Detected and assessed, whether to determine structure with the presence of damage, and then judge position and the degree of damage, and structure is current
Situation, variation tendency etc. for using function and structure to damage.Because vibration characteristics are the functions of its physical parameter, structure
Damage means the change of structural physical parameter, and the change of physical parameter necessarily causes the change of vibration characteristics.It is logical
The sensing equipment crossed in structure, the vibration to structure are monitored in real time, can obtain the vibration of structure different phase
Characteristic；Change to vibration characteristics is analyzed and handled, it is possible to the situation of change of structural physical parameter is obtained, so as to
Reach the purpose of damage check.Finally, detection is sent to result output module with assessment result by output port.
As structural healthy monitoring system, as a result output module is equally installed on transformer station's master control room, for a display
Device.Its control structure is as shown in Figure 4.
As a result the input port of output module is connected with the output port of structural healthy monitoring system, and effect is to receive structure
The analysis result of health monitoring systems, and showed over the display, referred to for power transformation O＆M and maintainer.
(1) non-destructive tests based on intrinsic frequency
Intrinsic frequency is a parameter for being easiest to obtain in modal parameters, and accuracy of identification is high.When structure is sent out
During raw damage, quality and rigidity can change, and the damage of usual rigidity becomes apparent from.So generally, when structure is sent out
During raw damage, intrinsic frequency reduces, and damping ratio increases.Therefore, intrinsic frequency before and after occurring can be damaged by comparative structure
Change to identify structural damage.
(2) non-destructive tests based on the displacement vibration shape
Relative to frequency, the change of the vibration shape is more sensitive to damaging.Changing progress damage check based on the vibration shape generally has 3 kinds
Approach：1. directly relatively damaging front and rear vibration shape change comes whether identification of damage produces；2. the mark damaged by vibration shape structural texture
Knowledge amount, by the change of mark amount or the generation judged come identification of damage of its value；3. orthogonalization condition based on the vibration shape is known
The generation not damaged.
Damnification recognition method based on the displacement vibration shape is with modal assurance criterion criterion MAC (modal assurance
Criterion) and its improvement criterion COMAC (coordinate modal assurancecriterion) is most representative.
Wherein, MAC is used for weighing the correlation between Mode Shape, and COMAC is used for weighing the mutual pass of the vibration shape in each free degree
System.Only for whether identification structure is damaged, using COMAC than wanting much less using the workload needed for MAC.Using
During COMAC, several typical positions k only need to be selected, measures vibration shape value thereon, rather than using requirement measurement during MAC
A little on vibration shape value.Generally detect whether structure occurs using the change of dynamic characteristic before and after MAC differentiation structural damages
Damage, the position of damage is further differentiated using COMAC and then is repaired.
(3) non-destructive tests based on curve modal shape
For many engineering structures, the bridge of such as highway and railway, bending resistance is overriding concern in Intensity Design
Factor.Deformation Curvature is directly relevant with the integrated stress state of this class formation.Therefore, in the case where bearing dynamic loading, curvature
Mode turns into the characteristic feature for holding curved structural dynamic characteristic.Camber mode is more sensitive for structural damage, for damage reason location
Also it is more accurate.The Deformation Curvature of structure and the fundamental relation of mechanical property parameters are:
K=M/EI
In formula:M is section turn moment.It can be seen that as fruit structure occur partial cleft or other damage, will it is relevant locally
Position causes EI change, so that the curvature at this changes, causes curve modal shape localized variation.Camber mode pair
Sensitivity is showed in local damage, carrying out damage reason location according to the change of camber mode will be more accurate.
(4) non-destructive tests based on structural stiffness matrix and flexibility matrix
In general, when structure is damaged, the information specific mass matrix that structural stiffness matrix provides is more.Work as structure
When larger damage occurs, significant change will occur for its rigidity, but for microlesion (such as<5%) when, this kind of method
It is very limited to non-destructive tests effect.At the same time, structural damage can cause the increase of structural compliance, therefore, structural compliance square
The change of battle array can be as the foundation of damage check.
(5) non-destructive tests based on element modal strain energy change
Modal strain energy method basic thought is by the front and rear vibration shape of measurement structure damage, and by the rigidity of structure, directly
Connect the modal strain energy for calculating and can characterizing structure change.When structure partial damages, part Mode Shape is in structure
Abrupt local nearby occurs for damage, causes injury region modal strain energy to vary widely.Therefore, before and after comparison structure damage
Modal strain energy, it can substantially judge the position of damage.
The distribution of construction unit modal strain energy is related to vibration shape component corresponding to the rigidity of unit and unit；If unit
Damage, then the modal strain energy change of injury region unit should be maximum before and after structural damage.Before and after definition structure breakage
Jth unit on the i-th rank mode element modal strain energy poor (MSEC) and element modal strain energy rate of change (MSECR) damage
Hinder distinguishing indexes Δ EMS%CΔ E and η ηMS%CRespectively:
Two formulas can be drawn more than, if local damage occurs for structure, most probable damage location will answer positioned at mode
Become energy rate of change to obtain at the beam element of maximum.During non-destructive tests, signatures for damage detection MSECR is drawn with unit (or rod member)
The two-dimensional curve of change, the position of damage will be indicated at curve mutation.Meanwhile the amplitude being mutated according to MSECR curves, it can determine
Property judge damage degree.
Above-mentioned case study on implementation is only for clear example of the present invention, and is not the limit to embodiment of the present invention
It is fixed.The obvious changes or variations amplified out the spirit for belonging to the present invention is still in protection scope of the present invention.
Claims (4)
1. a kind of multi-functional substation framework health monitoring and damnification recognition method, it is characterized in that, comprise the following steps：
(1) data acquisition module by the substation framework information transmission collected to structural healthy monitoring system；
(2) investigated, analyzed and assessed after structural healthy monitoring system calculating processing, investigation, analysis and assessment result are passed
Deliver to result output module；
(3) result output module is used to show result.
2. multi-functional substation framework health monitoring according to claim 1 and damnification recognition method, it is characterized in that, it is described
The analog quantity of data collecting module collected transformer station, switching value information and dependent image data in step (1).
3. multi-functional substation framework health monitoring according to claim 2 and damnification recognition method, it is characterized in that, it is described
The analog quantity information of collection is intrinsic frequency, the displacement modes vibration shape, curve modal shape and the rigidity of structure of substation structure
And flexibility matrix；
Switching value information is main transformer running status and transformer station's outlet running status in transformer station；
View data is power transformation structure minute elastic deformation.
4. multi-functional substation framework health monitoring according to claim 1 and damnification recognition method, it is characterized in that, it is described
Investigation, analysis and assessment include following manner in step (2)：
(1) non-destructive tests based on intrinsic frequency：When quality and rigidity change, intrinsic frequency reduces, and damping ratio increases；
(2) non-destructive tests based on the displacement vibration shape：1. directly relatively damaging front and rear vibration shape change comes whether identification of damage produces；
2. the mark amount damaged by vibration shape structural texture, by the change of mark amount or the generation judged come identification of damage of its value；③
Orthogonalization condition based on the vibration shape is come the generation of identification of damage；
Damnification recognition method based on the displacement vibration shape uses modal assurance criterion criterion MAC-modal assurance criterion
And its improve criterion COMAC-coordinate modal assurancecriterion；Wherein, MAC shakes for weighing mode
Correlation between type, COMAC are used for weighing the correlation of the vibration shape in each free degree；
If for need to identifying whether structure is damaged, using COMAC；
Detect whether structure is damaged using the change of dynamic characteristic before and after MAC differentiation structural damages；
(3) non-destructive tests based on curve modal shape；The Deformation Curvature of structure and the fundamental relation of mechanical property parameters are:
K=M/EI
In formula:M is section turn moment；If partial cleft or other damages occurs in structure, EI will be caused in relevant local location
Change so that the curvature at this changes, cause curve modal shape localized variation；Camber mode is for local damage
Performance is sensitive, and carrying out damage reason location according to the change of camber mode will be more accurate；
(4) non-destructive tests based on structural stiffness matrix and flexibility matrix：Structural damage can cause the increase of structural compliance, structure
The change of flexibility matrix can be as the foundation of damage check；
(5) non-destructive tests based on element modal strain energy change：By the front and rear vibration shape of measurement structure damage, and by structure
Rigidity, directly calculate the modal strain energy that can characterize structure change；When structure partial damages, part mode is shaken
Abrupt local occurs near structural damage for type, causes injury region modal strain energy to vary widely；Before comparison structure damage
Modal strain energy afterwards, it can substantially judge the position of damage；
The distribution of construction unit modal strain energy is related to vibration shape component corresponding to the rigidity of unit and unit；Definition structure is damaged
Element modal strain energy poor (MSEC) and element modal strain energy rate of change of the front and rear jth unit on the i-th rank mode
(MSECR) signatures for damage detection Δ EMSECΔ E and η ηMSECRespectively:
Two formulas can be drawn more than, if local damage occurs, damage location will be located at modal strain energy rate of change and obtain most
At the beam element being worth greatly；During non-destructive tests, the two-dimensional curve that signatures for damage detection MSECR changes with unit (or rod member) is drawn,
The position of damage will be indicated at curve mutation；Meanwhile the amplitude being mutated according to MSECR curves, it can qualitatively judge damage
Degree.
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