CN110530972A - A kind of ultrasound detection evaluation method and device and device application method for the assessment of cable ageing state - Google Patents
A kind of ultrasound detection evaluation method and device and device application method for the assessment of cable ageing state Download PDFInfo
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Abstract
The present invention provides a kind of ultrasound detection evaluation method and device and device application method for the assessment of cable ageing state, pass through accelerated aging test, acquire cable major insulation inner surface echo-signal, and the peak swing value and average amplitude value of the frequency response under different scale are obtained using wavelet analysis method analysis cable major insulation inner surface echo-signal, to establish frequency response under cable major insulation inner surface echo-signal different scale peak swing value and average amplitude value with its 90 DEG C at the equivalent operation time limit relation curve, according to the peak swing value and average amplitude value and the relation curve of actual motion cable, it may determine that the equivalent operation time limit at 90 DEG C of operation cable, according to the comparison of the operation time limit equivalent at its actual motion time limit and 90 DEG C, its aging most weak spot and whole ageing state are commented Valence.The present invention can detect whole ageing state and local ageing state simultaneously, have higher reliability, can be used for real-time detection.
Description
Technical field
The invention belongs to the detection technique field of cable, it is related to a kind of ultrasound detection for the assessment of cable ageing state and comments
Valence method and device and device application method.
Background technique
The XLPE of space network because its good mechanical performance, heat resistance, insulation performance and it is stable chemically
Can and be widely used in power cable insulation.However cable is in actual operation, by water, heat, electrically and mechanically stress because
The long-term synergy of element, physicochemical property and electrical property can deteriorate, to influence the stability and economy of operation of power networks.Mesh
Before, in the operation cable of China's active service, active time is had been over 30 years, and the design service life of a batch cable is general earliest
It is 30~40 years, the ageing state of cable insulation how is accurately and effectively assessed, at power department urgent problem.State
Inside and outside scholar has numerous studies, mainly from micro molecule structure and broad perspectives to the ageing state for how assessing cable insulation
Expansion can be associated with ageing state.
The electric-thermal born due to the different cable of operating condition-power synergy is different, and what cable generated in operation lacks
Sunken size, type, quantity are different, and ageing state is also different.In addition, even if the cable run under same operating condition, due to electricity
Cable is wrapped in high-temperature electric conduction copper conductor, and testing temperature is higher than temperature outside in cable major insulation, and inside aging is also serious compared with outside, lacks
It is intensive compared with outside to fall into distribution.With the increase of the cable work time limit, a part of defect is developed to outside by inside, and defect is in by small
To it is big, by as little as more development trends, the local ageing state of cable different location also changes with the operation time limit.Therefore, cable
Whole ageing state and the state of aging most serious point all have an impact to the normal operation of cable, i.e. the ageing state of cable is commented
Estimating should include: (1) whole ageing state；(2) local ageing state.
Research both domestic and external is based on laboratory research more, such as puncture test, thermogravimetric test, SEM electron microscope experiment (need to be to sample
Corroded) these detection means all being damaged to a certain extent property, it is impossible to be used in the real time monitoring of power cable and analysis.
Before this, have scholar to propose to utilize ultrasonic velocity method test cable ageing state, but the method can only reflect the entirety of cable
Ageing state can not reflect the state of aging most serious point simultaneously, and can not be applied to the scene mobile inspection in real time of whole cable
It surveys.
Summary of the invention
The object of the present invention is to provide it is a kind of for cable ageing state assessment ultrasound detection evaluation method and device and
Device application method solves the problems, such as that with a kind of method while entirety and local ageing state can not be detected, and may be implemented
Real-time continuous non-destructive testing.
The present invention is to be achieved through the following technical solutions:
A kind of ultrasound detection evaluation method for the assessment of cable ageing state, includes the following steps:
S1 takes identical with operation cable model to be evaluated from original cable, setting accelerated ageing temperature, to electricity
Cable carries out accelerated aging tests；
S2, by periodic sampling, each periodic sampling is primary, after cable to be removed is cooled to room temperature, is set with ultrasonic probe
In cable surface transmitting impulse wave and receives echo-signal, the corresponding cable echo signal of different ageing times is obtained；
S3, interception obtains cable major insulation inner surface echo-signal in cable echo signal, to table in cable major insulation
Face echo-signal carries out wavelet transformation, obtains different scale lower time and amplitude Value Data, finds out the maximum vibration under different scale
Simultaneously average amplitude value is calculated in amplitude, obtains the corresponding of ageing time and peak swing value and average amplitude value under different scale
Relationship；
S4, by accelerated ageing temperature be back-calculated to obtain different ageing times it is 90 DEG C corresponding at the equivalent operation time limit, obtain
The corresponding peak swing value of the equivalent operation time limit and average amplitude value at different 90 DEG C under different scale, 90 under drafting different scale
The relation curve of equivalent the operation time limit and peak swing value and average amplitude value at DEG C；
S5, the echo-signal of the operation cable of the same model of on-the-spot test, obtains under different scale according to S3 and S4 processing
Peak swing value and average amplitude value, compared with the obtained relation curve of S4,90 DEG C for obtaining the operation cable are inferior
The operation time limit equivalent at 90 DEG C of the operation cable and operation cable actual motion time limit comparison are judged to transport by the effect operation time limit
The history run of row cable and the state and entirety ageing state for assessing cable aging most serious point.
Preferably, in S1, before carrying out accelerated aging tests to cable, cleaning cable surface is wiped with dehydrated alcohol, then
It is dry.
Preferably, in S2, the multiple echo-signals positioned at cable different location of each period measuring, in S3, each period
The peak swing value of test is the average value of the peak swing value of cable different location, and the average amplitude value of each period measuring is
The average value of the average amplitude value of cable different location.
Preferably, in S2, periodicity is more than or equal to 5.
Preferably, in S3, carrying out wavelet transformation to cable major insulation inner surface echo-signal is specifically: to cable major insulation
Inner surface echo-signal carries out plus zero processing, and then to adding zero treated, cable major insulation inner surface echo-signal carries out small echo
Transformation.
Preferably, in S4,8 DEG C are increased according to temperature is every, the rule that the insulating materials service life reduces half is back-calculated to obtain acceleration
The equivalent operation time limit at different ageing times are 90 DEG C corresponding under aging temperature.
Preferably, in S5, judge to run the history run of cable and assess its state and be specifically:
If the equivalent operation time limit is equal at 90 DEG C for running cable compared according to peak swing value and average amplitude value
Greater than its actual motion time limit, illustrate that the operation cable has running overload situation in the process of running, major insulation lacks
It falls into situation and whole ageing state is even more serious than operating normally cable, in the case that overall operation condition is constant, actually make
It will be less than design service life at 90 DEG C with the service life；
If the equivalent operation time limit is equal at 90 DEG C for running cable compared according to peak swing value and average amplitude value
Equal to its actual motion time limit, illustrate that the operation cable operating status is normal, it, can in the case that overall operation condition is constant
Reach design service life at 90 DEG C；
If the equivalent operation time limit is equal at 90 DEG C for running cable compared according to peak swing value and average amplitude value
Less than its actual motion time limit, illustrate that the operation cable operating status is good, it, can in the case that overall operation condition is constant
Meet or exceed design service life at 90 DEG C；
If the equivalent operation time limit is all larger than its practical fortune at 90 DEG C of the operation cable compared according to peak swing value
The row time limit, the equivalent operation time limit is less than its actual motion year at the operation 90 DEG C of cable compared according to average amplitude value
Limit, illustrates that the operation cable entirety ageing state is good, but there are individual serious aging points, the constant situations of overall operation condition
Under, actual life will be less than design service life at 90 DEG C；
If the equivalent operation time limit is respectively less than its practical fortune at 90 DEG C of the operation cable compared according to peak swing value
The row time limit, the equivalent operation time limit is greater than its actual motion year at the operation 90 DEG C of cable compared according to average amplitude value
Limit, illustrating the operation cable, there is no individual serious aging points, but whole ageing state is even more serious than operating normally cable, whole
In the case that running body condition is constant, actual life will be less than design service life at 90 DEG C.
A kind of ultrasound detection evaluating apparatus for the assessment of cable ageing state, including ultrasound detection module and signal processing
Module；
Ultrasound detection module returns cable for emitting impulse wave to operation cable surface and receiving cable echo signal
Wave signal is transferred to signal processing module；
Signal processing module obtains cable major insulation inner surface echo for intercepting in the cable echo signal received
Signal carries out wavelet transformation to cable major insulation inner surface echo-signal, obtains the maximum vibration under the different scale of operation cable
Amplitude and average amplitude value.
It preferably, further include contrast module and indicating module；
Signal processing module, be also used to obtain operation cable different scale under peak swing value and mean amplitude of tide
Value is transferred to contrast module；
Contrast module preserves equivalent operation at 90 DEG C of difference under the obtained different scale of any one of claim 1-7
The corresponding peak swing value of the time limit and average amplitude value, and according under the actual useful year and different scale of operation cable to be measured
The corresponding peak swing value of the equivalent operation time limit and the multiple ageing state ranks of average amplitude value setting, will run at different 90 DEG C
The equivalent operation time limit pair at peak swing value and average amplitude value under the different scale of cable are 90 DEG C different under different scale
The peak swing value and average amplitude value answered are compared, and the ageing state rank of operation cable are determined, according to ageing state grade
It Fa Song not instruct accordingly to indicating module；
Indicating module, for carrying out the instruction of ageing state rank according to the instruction received.
The application method of the ultrasound detection evaluating apparatus for the assessment of cable ageing state, ultrasound detection is evaluated
Device moves longitudinally along the cable, and in moving process, ultrasound detection module is directed at cable always.
Compared with prior art, the invention has the following beneficial technical effects:
The method of the present invention carries out accelerated aging test, acquires cable major insulation inner surface echo-signal, and utilize small wavelength-division
Analysis method analysis cable major insulation inner surface echo-signal obtains the peak swing value and average vibration of the frequency response under different scale
Amplitude, to establish the peak swing value of the frequency response under cable major insulation inner surface echo-signal different scale and be averaged
Amplitude with its 90 DEG C at the equivalent operation time limit relation curve, and indicate that cable major insulation inner surface echo-signal frequency is rung
The peak swing value and average amplitude value the answered variation relation reduced with the increase of cable major insulation degree of aging, and will be ultrasonic
The frequency response peak swing value of echo-signal is associated with aging most serious point, average amplitude value is associated with whole ageing state,
To detect whole ageing state and local ageing state simultaneously；According to the peak swing value and mean amplitude of tide of actual motion cable
Value and the relation curve, it can be determined that run the equivalent operation time limit at 90 DEG C of cable out, according to its actual motion time limit and
The comparison of the equivalent operation time limit, evaluates its aging most weak spot and whole ageing state at 90 DEG C.The present invention is based on small
Wave analysis method establishes when m- scale (frequency)-amplitude relation curve of ultrasonic echo, since wavelet analysis method has essence
(understanding for frequency resolution and temporal resolution: frequency resolution Precise Representation can be with for true frequency and temporal resolution
Definite to obtain different frequency point component information in signal, frequency resolution difference indicates that the component letter of a certain frequency band can only be obtained
Breath；Temporal resolution Precise Representation, which can be obtained definitely, sometime puts corresponding information, and the representative of temporal resolution difference can only obtain
Obtain certain time period and information occur, can not judge the specific time point that information occurs), therefore method of the invention can be used for
The part of one whole cable of the real-time continuous detection in scene and whole degree of aging, and it is most tight according to temporal information accurate positioning aging
The position of emphasis.The present invention utilizes the Real-time Wavelet De-noising Algorithm method of ultrasonic signal, analyzes the echo letter on the inside of cable major insulation
Number, compared to velocity of sound analytic approach, across the echo-signal of entire major insulation, the Global Information of cable major insulation is not only carried,
Also the information of major insulation inner surface aging most serious point is carried, whole ageing state and local ageing state can be detected simultaneously.
Therefore the method in the present invention can more accurately reflect the ageing state of cable compared to sound velocity method comprehensively, have higher reliable
Property；And since wavelet analysis method carries temporal information, so can be used for real-time detection.
Device of the present invention is in use, make device carry over cable movement with certain speed, so as to obtain edge
Peak swing value and average amplitude value at the different location in cable length direction, can be whole with real-time continuous detection one on site
The part of cable and whole degree of aging, and according to the position of temporal information accurate positioning aging most serious point.
It further, not only can the real-time continuous whole cable of detection in scene by setting comparison module and indicating module
Ageing state, and device can also judge and indicate the ageing state of different location, be quickly found out seriously convenient for staff
Aging point.
Detailed description of the invention
Fig. 1 m- magnitude relation figure when being the scale (frequency)-of main inner insulative surface echo-signal.
Fig. 2 is lower 90 DEG C equivalent operation time limits of different scale and peak swing value relational graph.
Fig. 3 is lower 90 DEG C equivalent operation time limits of different scale and average amplitude value relational graph.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The present invention passes through emission pulse ultrasonic and receives from the reflected echo letter of power cable major insulation inner surface
Number, wavelet analysis is carried out to echo-signal on time-frequency domain using software, obtain different scale (frequency) the lower time becomes with amplitude
Gesture figure, draw cable major insulation inner surface echo-signal under different scale peak swing and mean amplitude of tide and 90 DEG C of cable it is inferior
The relation curve of the effect operation time limit.Then by collection in worksite cable major insulation inner surface echo-signal, echo-signal is carried out
The peak swing under different scale and average amplitude value are analyzed and obtained, by comparing with the relation curve of drafting, judges electricity
The operating status of cable and the ageing state for assessing cable.
The specific implementation step of the method for the present invention is as follows:
Step 1, the new cable of certain producer's model is chosen, cutting is machined as the cut cable of 30cm, is wiped with dehydrated alcohol
Wipe cleaning, be placed on 70 DEG C of dry 5h in baking oven；
Step 2,8 DEG C are increased according to temperature is every, the insulating materials service life reduces the rule setting accelerated ageing temperature of half simultaneously
Accelerated aging tests are carried out, period distances are set, and multiple digestion periods are arranged, wherein ageing oven, which uses, meets GB/T
11026.4-2012 defined single chamber baking oven；
Step 3, every accelerated ageing a cycle takes a sample to use 1- at once after sample cooled to room temperature
2.5MHz ultrasonic probe is placed in cable surface transmitting impulse wave and receives echo-signal, according to the number of plies in the construction of cable, determines
Cable major insulation inner surface echo-signal in echo-signal out, and to obtain cable master exhausted for interception in the echo-signal received
Edge inner surface echo-signal, each cycle sample test are located at the echo-signal of sample different location not less than 5, and test is completed
Afterwards, sample is continued to put back to aging in baking oven, to carry out next cycle experimental；
Step 4, the cable major insulation inner surface echo-signal measured in step 3 carries out plus zero processing；
Step 5, wavelet transformation is carried out to the data for adding zero processing to obtain in step 4；The present invention is small with origin software
For wave analysis method, Analysis-Signal processing-Wavelet-Continuous is selected into the interface origin
Wavelet is selected in frame what is jumped out, Discrete Signal select echo when width in amplitude, Scale selecting scale
It is 1,5,10,50,100,200,500, Wavelet Type selection Morlet small echo, fits the data selection Stack heap come
It is folded to present, as shown in Figure 1.(understanding about scale and frequency relation: the scale on scale similar map in wavelet analysis,
Scale height means no details, and scale is low to be meaned it can be seen that more details.Similar, in frequency, low frequency, that is, high ruler
Degree, to the panoramic information of induction signal；High frequency, that is, low scale, then can provide more more detailed informations.According to Fig. 1, scale from 1 to
500 are sequentially increased, corresponding from relative high frequency information to the partition analysis of rather low-frequency information, compared to Fourier analysis, small echo
Analysis can accurate reflecting time, frequency and amplitude relationship, resolution changable, can be used for analyzing non-stationary signal.)
Step 6, the data obtained after wavelet transformation in step 5 save different scale (frequency) lower time and amplitude
Data simultaneously draw frequency-when-width relational graph, find out peak swing value under different scale (frequency) and calculate average amplitude value, then
Record；Obtain the relationship of different ageing times and peak swing value and average amplitude value under different scale；
Step 7, by accelerated ageing temperature and ageing time be back-calculated to obtain different ageing times it is 90 DEG C corresponding at it is equivalent
The time limit is run, the relation curve of equivalent the operation time limit and peak swing value and average amplitude value at lower 90 DEG C of different scale is drawn；
Step 8, the same model difference of on-the-spot test runs time limit cable echo signal, and interception obtains operation cable major insulation
Inner surface echo-signal handles according to step 4, step 5 and step 6 and obtains peak swing value and mean amplitude of tide under different scale
The relation curve of the equivalent operation time limit and peak swing value and average amplitude value compares at value, with lower 90 DEG C of different scale, judgement
The equivalent operation time limit at 90 DEG C of cable major insulation is compared according to the operation time limit equivalent at 90 DEG C and the actual motion time limit, judgement
The history run of cable and the state and entirety ageing state for assessing cable aging most serious point.
Part specific implementation case of the invention is as follows:
Embodiment 1
186 DEG C of accelerated ageings are carried out to the XLPE cable of certain model, according to formula T1=T+N*8, accelerating multiple is 2NTimes, T
For operating temperature, T1For accelerated ageing temperature, therefore it is 2 that the present embodiment, which accelerates multiple,12, each cycle 10.69h (is equivalent to 90 DEG C
Lower 5 years), 5 periods of aging are set altogether, the sample after unaged and aging is tested.According to 4-6 pairs of technical scheme steps
Cable major insulation inner surface echo-signal is handled, and sample major insulation inner surface echo-signal under different ageing times is obtained
When scale (frequency)-m- magnitude relation figure (Fig. 1) and respectively record different cycles sample major insulation inner surface echo-signal frequency
It responds peak swing value and calculates average amplitude value.Establish ageing time and cable major insulation inner surface echo-signal at 186 DEG C
Frequency response peak swing value and average amplitude value relation table are as shown in Table 1 and Table 2.According to accelerated ageing rule, it is back-calculated to obtain
The equivalent operation time limit at 90 DEG C, and draw out at lower 90 DEG C of different scale the equivalent operation time limit and frequency response peak swing value and
Average amplitude value relation curve (uses sectional linear fitting) as shown in Figures 2 and 3.
1 186 DEG C of ageing times of table and scale (frequency) lower frequency respond maximum amplitude relation table
2 186 DEG C of ageing times of table and scale (frequency) lower frequency respond average amplitude relation table
The test of certain model cable of live actual motion and treated data and the curve of Fig. 2 and Fig. 3 are compared,
It can determine whether the history run of cable and assess the local ageing state and entirety ageing state of cable.
Embodiment 2
According to the correlation step in technical solution, 5 years certain model (identical as 1 model of embodiment) has been run for somewhere
XLPE cable is tested, its frequency response peak swing value difference under 1,5,10,50,100,200 and 500 scales is recorded
It is 0.0046249,0.0242547,0.029273,0.0365282,0.0445753,1.7322649 and 2.1759119, it is average
Amplitude is respectively 0.000675,0.003674,0.004461,0.007816,0.012951,0.419216 and 0.620941.
It is compareed with Fig. 2 and Fig. 3, it can be determined that the equivalent operation time limit is between 5-10 at 90 DEG C of this cable.According to point of Fig. 2, Fig. 3
Section linear fit curve calculates, and when scale is 1, equivalent runing time is respectively 10-5* (0.0046249- at 90 DEG C
0.00456)/(0.00467-0.00456)=7.05 year, 10-5* (0.000675-0.00064)/(0.0007-0.00064)=
7.083, it similarly obtains under other scales, frequency response peak swing value and average amplitude value are respectively 7.05 and 7.08.90℃
Under the equivalent operation time limit be greater than 5 years, illustrate that this cable exists in the process of running for a long time by electric-thermal-power synergy, cable is long
Its major insulation entirety ageing state of phase running overload is even more serious than operating normally cable, and there is also individual more serious agings
Point, therefore, the equivalent operation time limit is greater than 5 years at 90 DEG C.The theory that this cable actual life will be less than designing at 90 DEG C makes
With the service life, local ageing point and whole ageing state should be noted, but in view of service life is shorter, cable can be inspected by random samples periodically.
Embodiment 3
According to the correlation step in technical solution, 15 years certain model (identical as 1 model of embodiment) is run for somewhere
XLPE cable is tested, and is recorded its peak swing numerical value under 1,5,10,50,100,200 and 500 scales and is respectively
0.004515,0.02396,0.028355,0.03427,0.039745,1.246295 and 1.58907, average amplitude value is respectively
0.00061,0.003145,0.004395,0.00664,0.0126,0.33586 and 0.44896, control is compareed with Fig. 2 and Fig. 3,
It may determine that the equivalent operation time limit is between 10-15 at 90 DEG C of this cable.The piecewise linearity compareed according to Fig. 2 and Fig. 3 is quasi-
Curve is closed to calculate, when scale is 1, at 90 DEG C the equivalent operation time limit be respectively 15-5* (0.004515-0.00447)/
(0.00456-0.00447)=12.5 year, 15-5* (0.00061-0.00058)/(0.00064-0.00058)=12.5, similarly
It obtains under other scales, frequency response peak swing value and average amplitude value are 12.5.Therefore, the equivalent service life at 90 DEG C
Less than actual life, local ageing situation and whole aging performance are all better than operating normally cable, illustrate that this cable is run
It is in good condition.In the case that overall operation condition is constant, this cable actual life will use the longevity more than the design at 90 DEG C
Life.
Embodiment 4
According to the correlation step in technical solution, 16 years certain model has been run (with 1 model phase of embodiment for somewhere
XLPE cable is tested together), records its frequency response peak swing value under 1,5,10,50,100,200 and 500 scales
Numerical value is respectively 0.004415,0.02357,0.027435,0.03366,0.037515,0.89064 and 1.081635, average to shake
Amplitude is respectively 0.000601,0.0031,0.004387,0.006603,0.012544,0.320552 and 0.431085, with Fig. 2
With Fig. 3 compare compare, according to peak swing value deposit index be 1 when, the equivalent operation time limit of 90 DEG C of this cable between 15-20 it
Between, when can determine whether that scale is 1 according to average amplitude value, the equivalent operation time limit of 90 DEG C of this cable is between 10-15.According to figure
2 sectional linear fitting curve calculates, be limited in equivalent operation year at 90 DEG C 20-5* (0.004415-0.00436)/
(0.00447-0.00436)=17.5 year is calculated according to the sectional linear fitting curve of Fig. 3, the equivalent operation time limit at 90 DEG C
15-5* (0.000601-0.00058)/(0.00064-0.00058)=13.25 year, similarly obtains under other scales, maximum vibration
Amplitude and average amplitude value are respectively 17.5 and 13.25.Show that service life is greater than the actual use longevity according to maximum amplitude
Life, and show that service life is less than actual life, illustrates that this cable entirety ageing state is good, but deposit according to average amplitude
In individual serious aging points, emphasis is needed to monitor and pay close attention to.In the case where overall operation condition is constant, this cable may be because a
The presence of other serious aging point causes the service life time limit to shorten.
Embodiment 5
According to the correlation step in technical solution, for somewhere 20 years of operation certain model (with 1 model phase of embodiment
XLPE cable is tested together), record the peak swing numerical value under its different frequency scale be respectively 0.004412,
0.023554,0.027412,0.033654,0.037506,0.879432 and 1.069614, average amplitude value is respectively
0.000495,0.002331,0.004175,0.006297,0.011372,0.178884 and 0.253252.It is compared with Fig. 2, it can
Judge that 90 DEG C of equivalent runing times of this cable between 15-20, compare with Fig. 3, can determine whether the 90 DEG C of equivalent operations of this cable
Time is between 20-25.It is calculated according to the sectional linear fitting curve of Fig. 1, is limited to 20-5* in equivalent operation year at 90 DEG C
(0.004412-0.00436)/(0.00447-0.00436)=17.64 year is calculated according to the sectional linear fitting curve of Fig. 2,
Equivalent operation year is limited to 25-5* (0.000495-0.00048)/(0.00052-0.00048)=23.125 year at its 90 DEG C, together
Reason obtains under other scales, and peak swing value and average amplitude value are respectively 17.64 and 23.13.It is obtained according to maximum amplitude
Service life is less than actual life out, and show that service life is greater than actual life, illustrates this according to average amplitude
Individual serious aging points are not present in cable, but cable overall performance, than the difference of actual use, whole ageing state needs emphasis to monitor
And concern.In the case where overall operation condition is constant, this cable may be because excessive defect or not bery serious aging point
Presence, quantitative change causes qualitative change, shortens the service life time limit.
Embodiment 6
The data of Tables 1 and 2 in embodiment 1, operation electricity to be measured are preserved in the contrast module of ultrasound detection evaluating apparatus
It is limited in the operation year of cable 22 years, therefore, the indicating module of ultrasound detection evaluating apparatus carries out following setting: when in acquisition signal
At peak swing value is lower than 90 DEG C in table 1 under each scale equivalent operation be limited in year 25 years analog value i.e. 0.00338,0.01407,
0.01575,0.01713,0.02885,0.43369 and 0.47447, it acquires each scale average amplitude value in signal and is lower than in table 2
At 90 DEG C it is equivalent operation be limited in year 25 years analog value i.e. 0.00048,0.00204,0.00411,0.00627,0.01110,
When 0.16716 and 0.21977, device dodges red light and alarms；Similarly, each scale peak swing value in signal is acquired to be lower than in table 1
Be limited to 20 years in equivalent operation year at 90 DEG C and be higher than 90 DEG C at be limited in equivalent operation year 25 years, average amplitude value be lower than 90 DEG C it is inferior
Effect operation is limited to 20 years and is higher than at 90 DEG C when being limited to 25 years in equivalent operation year in year, device sudden strain of a muscle amber light；Acquire each scale in signal
Peak swing value is lower than in table 1 to be limited to 15 years at 90 DEG C and is higher than at 90 DEG C and is limited to 20 years equivalent operation year, puts down in equivalent operation year
Equal amplitude lower than 90 DEG C at be limited to 15 years in equivalent operation year and be higher than when being limited to 20 years in equivalent operation year at 90 DEG C, device sudden strain of a muscle is green
Lamp；It is limited to 10 years in equivalent operation year at each scale peak swing value is lower than 90 DEG C in table 1 in acquisition signal and inferior higher than 90 DEG C
Effect operation be limited in year 15 years, average width amplitude lower than 90 DEG C at be limited to 10 years in equivalent operation year and higher than 90 DEG C at equivalent operation year
When being limited to 15 years, device dodges blue lamp；5 are limited in equivalent operation year at each scale maximum amplitude is lower than 90 DEG C in table 1 in acquisition signal
Year and be higher than 90 DEG C at be limited in equivalent operation year 10 years, average amplitude value be lower than 90 DEG C at equivalent operation year be limited to 5 years and be higher than
When equivalent operation year is limited to 10 years at 90 DEG C, device dodges purple lamp；It acquires each scale peak swing value in signal and is lower than in table 1 90 DEG C
Under be limited to 0 year in equivalent operation year and be higher than 90 DEG C at be limited in equivalent operation year 5 years, average amplitude value be lower than 90 DEG C at equivalent operation
Year is limited to 0 year and is higher than at 90 DEG C when being limited to 5 years in equivalent operation year, and device flashes white lamp；According to the correlation step in technical solution,
Whole wireline test is carried out to 22 years certain model cable of operation, hand-held ultrasound detects evaluating apparatus and carries over electricity with the speed of 1m/s
Cable is mobile, ultrasonic wave tranmitting frequency 104/ s, sample rate 109/s.Before 5.8s, device peak swing value and average amplitude value are corresponding
Lamp is yellow always, and in 5.8s, peak swing value corresponds to lamp and is changed into red and sounds an alarm, and shows that this time point is corresponding
There are serious aging points for cable section, answer great care periodic monitoring in cable operation hereafter, once discovery grave danger electricity
When net safe operation, it should replace in time.Indicator light colors and setting pitch density can be changed according to actual needs, so as to more smart
Really detection.
The assessment of the cable status based on Fourier analysis method was also done in this laboratory before this, accurate due to Fourier transformation
Degree depends on the window width of signal duration and selection, and the amplitude of the harmonic component of rather low-frequency is easy distortion, more suitable for
The individually state of research cable aging most serious point；And it is difficult to take into account frequency resolution and temporal resolution, and wavelet analysis
Method can combine.Therefore it compares wavelet analysis method to be particularly suited for assessing entirety and local ageing state simultaneously, also more
It is suitably applied real-time detection.
For the present invention compared to sound velocity method and Fourier analysis maximum amplitude method, one of the method for the present invention advantage is can be same
When assessment aging most serious point state and whole ageing state；The two of advantage are temporal resolution and frequency resolution more
Height is tested more accurate；The three of advantage are to provide three kinds of information of more accurate T/F-amplitude simultaneously, be conducive to existing
Field real-time detection.
Claims (10)
1. a kind of ultrasound detection evaluation method for the assessment of cable ageing state, which comprises the steps of:
S1, takes identical with operation cable model to be evaluated from original cable, and accelerated ageing temperature is arranged, to cable into
Row accelerated aging tests；
S2, by periodic sampling, each periodic sampling is primary, after cable to be removed is cooled to room temperature, is placed in electricity with ultrasonic probe
Cable surface emitting impulse wave and receives echo-signal obtain the corresponding cable echo signal of different ageing times；
S3, interception obtains cable major insulation inner surface echo-signal in cable echo signal, returns to cable major insulation inner surface
Wave signal carries out wavelet transformation, obtains different scale lower time and amplitude Value Data, finds out the peak swing value under different scale
And average amplitude value is calculated, obtain the corresponding pass of ageing time and peak swing value and average amplitude value under different scale
System；
S4, by accelerated ageing temperature be back-calculated to obtain different ageing times it is 90 DEG C corresponding at the equivalent operation time limit, obtain difference
The corresponding peak swing value of the equivalent operation time limit and average amplitude value at different 90 DEG C under scale, at lower 90 DEG C of different scale of drafting
The relation curve of equivalent the operation time limit and peak swing value and average amplitude value；
S5, the echo-signal of the operation cable of the same model of on-the-spot test, obtains under different scale most according to S3 and S4 processing
Large amplitude value and average amplitude value are compared with the obtained relation curve of S4, obtain equivalent fortune at 90 DEG C of the operation cable
The operation time limit equivalent at 90 DEG C of the operation cable and operation cable actual motion time limit comparison are judged operation electricity by the row time limit
The history run of cable and the state and entirety ageing state for assessing cable aging most serious point.
2. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S1
In, before carrying out accelerated aging tests to cable, cleaning cable surface is wiped with dehydrated alcohol, is then dried.
3. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S2
In, the multiple echo-signals positioned at cable different location of each period measuring, in S3, the peak swing value of each period measuring is
The average value of the peak swing value of cable different location, the average amplitude value of each period measuring are being averaged for cable different location
The average value of amplitude.
4. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S2
In, periodicity is more than or equal to 5.
5. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S3
In, to cable major insulation inner surface echo-signal carry out wavelet transformation be specifically: to cable major insulation inner surface echo-signal into
Row plus zero processing, then to adding zero treated, cable major insulation inner surface echo-signal carries out wavelet transformation.
6. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S4
In, 8 DEG C are increased according to temperature is every, the rule that the insulating materials service life reduces half is back-calculated to obtain different agings at a temperature of accelerated ageing
The equivalent operation time limit at time is 90 DEG C corresponding.
7. the ultrasound detection evaluation method according to claim 1 for the assessment of cable ageing state, which is characterized in that S5
In, judge to run the history run of cable and assess its state and be specifically:
If the equivalent operation time limit is all larger than at 90 DEG C of the operation cable compared according to peak swing value and average amplitude value
Its actual motion time limit illustrates that the operation cable has running overload situation, the defect feelings of major insulation in the process of running
Condition and whole ageing state are even more serious than operating normally cable, in the case that overall operation condition is constant, actually use the longevity
Life will be less than design service life at 90 DEG C；
If the equivalent operation time limit is equal at 90 DEG C of the operation cable compared according to peak swing value and average amplitude value
Its actual motion time limit illustrates that the operation cable operating status is normal, in the case that overall operation condition is constant, can reach
Design service life at 90 DEG C；
If the equivalent operation time limit is respectively less than at 90 DEG C of the operation cable compared according to peak swing value and average amplitude value
Its actual motion time limit illustrates that the operation cable operating status is good, in the case that overall operation condition is constant, can reach
Or more than 90 DEG C at design service life；
If the equivalent operation time limit is all larger than its actual motion year at 90 DEG C of the operation cable compared according to peak swing value
It limits, the equivalent operation time limit is less than its actual motion time limit at 90 DEG C of the operation cable compared according to average amplitude value, says
The bright operation cable entirety ageing state is good, but there are individual serious aging points, in the case that overall operation condition is constant,
Actual life will be less than design service life at 90 DEG C；
If the equivalent operation time limit is respectively less than its actual motion year at 90 DEG C of the operation cable compared according to peak swing value
It limits, the equivalent operation time limit is greater than its actual motion time limit at 90 DEG C of the operation cable compared according to average amplitude value, says
Individual serious aging points are not present in the bright operation cable, but whole ageing state is even more serious than operating normally cable, whole to transport
In the case that row condition is constant, actual life will be less than design service life at 90 DEG C.
8. a kind of ultrasound detection evaluating apparatus for the assessment of cable ageing state, which is characterized in that including ultrasound detection module
And signal processing module；
Ultrasound detection module believes cable echo for emitting impulse wave to operation cable surface and receiving cable echo signal
Number it is transferred to signal processing module；
Signal processing module obtains cable major insulation inner surface echo letter for intercepting in the cable echo signal received
Number, wavelet transformation is carried out to cable major insulation inner surface echo-signal, obtains the peak swing under the different scale of operation cable
Value and average amplitude value.
9. the ultrasound detection evaluating apparatus according to claim 8 for the assessment of cable ageing state, which is characterized in that also
Including contrast module and indicating module；
Signal processing module, be also used to obtain operation cable different scale under peak swing value and average amplitude value pass
It is defeated by contrast module；
Contrast module, preserve under the obtained different scale of any one of claim 1-7 it is 90 DEG C different at the equivalent operation time limit
Corresponding peak swing value and average amplitude value, and according to different under the actual useful year and different scale of operation cable to be measured
The corresponding peak swing value of the equivalent operation time limit and average amplitude value set multiple ageing state ranks at 90 DEG C, will run cable
Different scale under peak swing value and average amplitude value it is 90 DEG C different under different scale at the equivalent operation time limit it is corresponding
Peak swing value and average amplitude value are compared, and determine the ageing state rank of operation cable, are sent out according to ageing state rank
Send corresponding instruction to indicating module；
Indicating module, for carrying out the instruction of ageing state rank according to the instruction received.
10. the application method described in claim 8 or 9 for the ultrasound detection evaluating apparatus of cable ageing state assessment,
It is characterized in that, ultrasound detection evaluating apparatus is moved longitudinally along the cable, in moving process, ultrasound detection module is aligned always
Cable.
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