CN108872648B - Radial lesion mimic and test method under the influence of a kind of cable abnormal hot spots - Google Patents
Radial lesion mimic and test method under the influence of a kind of cable abnormal hot spots Download PDFInfo
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- CN108872648B CN108872648B CN201810958268.4A CN201810958268A CN108872648B CN 108872648 B CN108872648 B CN 108872648B CN 201810958268 A CN201810958268 A CN 201810958268A CN 108872648 B CN108872648 B CN 108872648B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The invention discloses a kind of lesion mimic method radial under the influence of cable abnormal hot spots, left and right transverse shifting track is provided in the lagging casing of simulator；First support component includes the left and right support column being erected on left and right transverse shifting track, and left and right support column is separately connected longitudinal movement track；U-shaped folder tool is set on longitudinal movement track；U-shaped folder tool includes U-shaped folder head, is additionally provided with temperature sensor and heating component on U-shaped folder head；Second support component is identical as the first support component structure.Assessment method include test obtain no fault-free cable and test and assess cable reference electric discharge amplitude distribution spectrum and assessment electric discharge amplitude distribution spectrum, carry out the conversion of Weibull distribution profile, fitting distribution profile maximum likelihood curve and calculated curve maximum offset and analysis judgement and etc..Simulator can easily and effectively realize the cable different fault simulations radially damaged, degree that assessment method energy accurate judgement cable radially damages under the influence of abnormal hot spots.
Description
Technical field
The invention belongs to cable fault diagnostic techniques field, mould is radially damaged under the influence of especially a kind of cable abnormal hot spots
Fit test method.
Background technique
The motor-car cable of EP rubbers type has many advantages, such as that dielectric properties are higher, and high temperature resistant and low temperature tolerance ability are strong, is
The type of cable being most widely used at present is one of the core equipment of power supply system on train, safe and reliable operation for
Ensure that the security implications of motor-car system are great.In actual operation, cable need to adapt to the various special cabling requirements of car body, can not
There is the case where bending with avoiding, gradually increase additionally, due to complicated route, the speed of service is continuously improved, so that cable insulation goes out
Now radial damage, leads to the generation of insulating layer radial cracking and abnormal hot spots, the serious operational reliability for reducing cable.
Detection method for local discharge is the effective ways of latent defect and damage in current detection cable, test sensitivity compared with
Height, and test signal and carry bulk information, facilitate the state of insulation of accurate judgement cable.But it is surveyed in the factory of motor-car cable
In examination and customary detection, usually to nature, i.e., the cable without bending and abnormal hot spots is tested, and detection parameters are also only
Only based on partial discharge quantity, have difficulties for the simulation and detection that are radially damaged under the influence of abnormal hot spots.In addition, existing
Some cable crane torsion test devices mainly test cable along axial bend resistance ability, and test result is only capable of for material
The performance of itself is reflected, it is difficult to the radial damage problem present in reflecting motor-car cable in actual operation, and lack
The possibility that further field working conditions are further analyzed.All in all, radial direction can be carried out to motor-car cable by lacking very much at present
The simulator of damage and corresponding assessment method, therefore the simulator and evaluating method are studied, it is dynamic for future
The safe and effective O&M of vehicle cable has great engineering value and theory significance.
Summary of the invention
The object of the present invention is to provide lesion mimic radial under the influence of a kind of cable abnormal hot spots and test methods.
Realize that the technical solution of the object of the invention is as follows:
Radial lesion mimic and test method under the influence of a kind of cable abnormal hot spots, including simulation below and test
Step:
Step 1: assembling cable radial direction lesion mimic device
1.1: the cable radial direction lesion mimic device, including lagging casing (1), the bottom in lagging casing (1) are provided with
Left transverse shifting track (32) and right transverse shifting track (33)；
1.2: further including the first support component (27) and the second support component (25)；First support component (27) includes
The left support column being erected on left transverse shifting track (32) and the right support column being erected on right transverse shifting track (33),
Left and right support column is separately connected the left and right both ends of longitudinal movement track (29)；It vertically moves on track 1 (29), is filled by lifting
It sets and is set with one or two longitudinally movable 1 (4) of U-shaped folder tool；U-shaped folder tool includes for clamping cable laterally or longitudinally
U-shaped folder head, be additionally provided with temperature sensor 1 (3) and heating component 1 (5) on U-shaped folder head；
Second support component (25) is identical as the first support component (27) structure；
1.3: further including the control for controlling the heating component 1 (5) such as the cable radial direction lesion mimic device in step 1.1
Device (21) processed, the setting environment temperature sensor (18) internal in lagging casing (1), and lateral graduated scale (24) and longitudinal quarter
It spends ruler 1 (26)；
1.4: such as the cable radial direction lesion mimic device in step 1.1, further including and the first support component (27) structure phase
Same third support component (22)；
Step 2: the damage of cable radial direction is handled under the influence of abnormal hot spots；
2.1: preparing completely new test cable (28), be fixed in U-shaped folder and have 1 (4), 2 (8) of U-shaped folder tool, U-shaped folder tool 3
(12) on, and make above-mentioned 3 U-shaped folders tool in horizontal distribution, keep heating component 1 (5), heating component 2 (9), heating component 3
(13) temperature is 80 DEG C~90 DEG C, carries out processing in 4~5 hours, obtains the test cable not damaged radially；
2.2: preparing completely new test cable (28), be fixed in U-shaped folder and have 1 (4), 2 (8) of U-shaped folder tool, U-shaped folder tool 3
(12) on, and U-shaped folder is made to have the top that 1 (4) are in longitudinal movement track 1 (29), U-shaped folder has 2 (8) and is located at longitudinal movement
The middle position of track 2 (30), U-shaped folder have 3 (12) and are located at former horizontal position, keep heating component 1 (5), heating component 2 (9),
The temperature of heating component 3 (13) is 100 DEG C~110 DEG C, carries out processing in 10~15 hours, obtains the test slightly radially damaged
Cable；2.3: preparing completely new test cable (28), be fixed in U-shaped folder and have 4 (34), 5 (36) of U-shaped folder tool, U-shaped folder tool 3
(12) on, and U-shaped folder is made to have the top that 5 (36) are in longitudinal movement track 3 (31), U-shaped folder has 4 (34) and is located at longitudinal move
The middle position in dynamic rail road 2 (30), U-shaped folder have 3 (12) and are located at former horizontal position, keep heating component 4 (35), heating component 5
(37), the temperature of heating component 3 (13) is 130 DEG C~140 DEG C, carries out processing in 30~40 hours, obtains moderate and radially damages
Test cable；
2.4: preparing completely new test cable (28), be fixed in U-shaped folder and have 4 (34), U-shaped folder tool 5 (36), U-shaped folder
Have on 3 (12), and U-shaped folder is made to have the intermediate ends that 5 (36) are in longitudinal movement track 3 (31), 4 (34) of U-shaped folder tool are located at vertical
To the top of moving track 2 (30), U-shaped folder has 3 (12) and is located at former horizontal position, keeps heating component 4 (35), heating component
5 (37), heating component 3 (13) temperature be 140 DEG C~150 DEG C, carry out processing in 60~80 hours, obtain severe and radially damage
Test cable；
Step 3: the test radially damaged under the influence of cable abnormal hot spots；
For step 1 in step 2 through handling the obtained test cable Bu Tong radially damaged, to it in abnormal hot spots shadow
Obtained radial damage is tested under sound, comprising the following steps:
3.1: taking trouble-free cable, test cable electric discharge amplitude distribution is repeated several times using instrument for measuring partial discharge and composes；
All cable discharge amplitude distributions spectrum is averaged, the reference electric discharge frequency distribution profile F as fault-free cable0,qi；Wherein,
qiFor the discharge capacity in test process, range 100pC-2000pC, F0,qiFor each discharge capacity qiUnder mean discharge number, qi
Take a little between be divided into 100pC, i is 1~20；
3.2: taking faulty cable X, test cable electric discharge amplitude distribution is repeated several times using instrument for measuring partial discharge and composes；
All cable discharge amplitude distributions spectrum is averaged, the assessment electric discharge amplitude distribution as assessment cable composes FX,qi；Wherein, qi
For the discharge capacity in test process, range 100pC-2000pC, FX,qiFor each discharge capacity qiUnder mean discharge number, qi's
100pC is divided between taking a little, i is 1~20；
3.3: F is composed to reference electric discharge amplitude distribution0,qiF is composed with assessment electric discharge amplitude distributionX,qiCarry out Weibull distribution profile
Conversion, firstly, determine the probability of happening of each discharge capacity, it is as follows:
In formula, P0(qi) and PX(qi) it is respectively distribution profile F under reference and assessment state0,qiAnd FX,qiMiddle discharge capacity qiOut
Current representative probability value；Then, the conversion of? vertical axis component is carried out, as follows:
N0(qi)=- ln [1-P0(qi)],
NX(qi)=- ln [1-PX(qi)]；
In formula, N0(q) and NxIt (q) is respectively the? vertical axis component of Weibull distribution profile under reference and assessment state；Finally,
It is distributed spectral coordinate using the Weibull after conversion, Weibull distributed model parameter alpha can be calculated to obtain0、β0、αX、βX, it is as follows:
In formula, α0、β0Scale parameter and form parameter, α respectively under unfaulty conditionsX、βXIt is then ruler under faulty state
Spend parameter and form parameter；Scale parameter α0With αXPhysics dimension with discharge capacity is electric discharge frequency distribution profile F0,qiAnd FX,qi
The middle accumulated probability for occurring discharging respectively reaches discharge capacity size when 63.2% or more；And ε0、εXMeet following relationship: ε0,
εX∈[1,20]；Form parameter β0And βXFor nondimensional characteristic parameter.
Step 4: calculated Weibull distributed model parameter alpha0、β0、αX、βX, unfaulty conditions is constructed respectively
With to Weibull distributed model function curve under assessment state, and calculated curve maximum offset is as follows:
Weibull distributed model function curve G under the non-malfunction constructed0(q) and corresponding maximum offset D0Point
Not are as follows:
In formula, i is integer, 1≤i≤20；qiFor the discharge capacity size of i-th of test point；The state to be tested and assessed constructed
Lower Weibull distributed model function curve GX(q) and corresponding maximum offset DXIt is respectively as follows:
In formula, i is integer, 1≤i≤20；qiFor the discharge capacity size of i-th of test point；
Step 5: Weibull distribution profile deviation ratio η is calculated, as follows:
Step 6: analysis determines, comprising:
If η≤1.2, cable of testing and assessing is without radial damage；If 1.2 < η≤2.0, cable of testing and assessing is slight radial damage；
If η > 2.0, cable moderate of testing and assessing or severe are radially damaged, and further calculate the radial Damage coefficient σ of cable to be tested and assessedX,
Step 7: calculating the radial Damage coefficient σ of state cable to be tested and assessedX, it is as follows:
In formula, αX、βXFor to Weibull distributed model parameter under assessment state；
If σX< 500, then cable of testing and assessing is that moderate is radially damaged；If 500 < σX< 1000, then cable of testing and assessing is that severe is radially damaged
Wound.
The beneficial effects of the present invention are simulator can easily and effectively realize that cable is different under the influence of abnormal hot spots
The fault simulation radially damaged.Assessment method passes through electric discharge amplitude distribution (PDHD) spectrum and (the Wei Buer distribution of Weibull distribution profile
Spectrum) conversion use, and using Weibull distribution profile deviation ratio under different faults state and radial make combining for Damage coefficient
With comprehensively being analyzed cable radial direction damage fault, more precisely judge the degree that cable radially damages.
Detailed description of the invention
Fig. 1 is the main view of cable radial direction lesion mimic device；
Fig. 2 is the top view of cable radial direction lesion mimic device；
Fig. 3 is the flow chart that cable radially damages assessment method.
Specific embodiment
Below with reference to embodiment, the invention will be further described.
Fig. 1 is the main view of cable radial direction lesion mimic device, including lagging casing (1), vertical adjusting knob 1 (2), temperature
Spend sensor 1 (3), U-shaped folder has 1 (4), heating component 1 (5), vertical adjusting knob 2 (6), temperature sensor 2 (7), U-shaped folder tool
2 (8), heating component 2 (9), vertical adjusting knob 3 (10), temperature sensor 3 (11), U-shaped folder have 3 (12), heating component 3
(13), U-shaped folder have 4 (34), U-shaped folder have 5 (35), signal transmssion line (14), test fixed port (15), bushing (16),
Signal acquisition terminal (17), environment temperature sensor (18), setting adjuster (19), display screen (20), controller (21), support group
Part 3 (22), longitudinal graduated scale 2 (23), lateral graduated scale (24), support component 2 (25), longitudinal graduated scale 1 (26), support component
1 (27), test cable (28).
Wherein, vertical adjusting knob 1 (2), vertical adjusting knob 2 (6), vertical adjusting knob 3 (10) can be adjusted U-shaped respectively
Fixture 1 (4), U-shaped folder have 2 (8) and U-shaped folder has the height of 3 (12).Support component 1 (27), support component 2 (25), support component
3 (22) are respectively connected with longitudinal movement track 1 (29), longitudinal movement track 2 (30), longitudinal movement track 3 (31).Support component 1
(27), support component 2 (25), support component 3 (22) are connected to transverse shifting track 1 (32), transverse shifting track 2 (33)
On；
Fig. 2 is the top view of cable radial direction lesion mimic device.It, can be to test by controlling each adjusting knob of vertical direction
The height at cable (28) each position is adjusted, while passing through longitudinal graduated scale 1 (26), the adjustable survey of longitudinal graduated scale 2 (23)
The lateral position of test cable (28) is adjusted by lateral graduated scale (24) for the lengthwise position for trying cable (28), realizes cable
Simultaneously there is the effect damaged in radial deformation；It can be to heating component by setting adjuster (19), display screen (20), controller (21)
1 (5), heating component 2 (9), the local heating effect of heating component 3 (13) are controlled, and are radially damaging position with dummycable
It sets and the phenomenon that abnormal hot spots occurs；When needing to simulate more serious cable and radially damaging, U-shaped folder is selected to have 3 (12), U-shaped
Fixture 4 (34), U-shaped folder have 5 (35) and adjust its relative position, so that bending place curvature increases, while the temperature of each heating component
Degree is set as higher temperature；When needing dummycable radially to damage lighter situation, U-shaped folder is selected to have 1 (4), U-shaped folder tool 2
(8), U-shaped folder has 3 (12) and adjusts its relative position so that bending place curvature reduces, the temperature setting of each heating component be compared with
Low temperature；Failure simulation device can realize 4 grade fault degrees, i.e., radially damage without radial damage, slight radial damage, moderate
Wound and severe are radially damaged.
In use, adjusting radial lesion mimic device using setting adjuster (19), display screen (20), controller (21)
State, and test cable (28) are loaded to corresponding position, start heating component, local heating, mould are carried out to bending part
Quasi- cable radial direction damage fault.
Fig. 3 is the assessment method flow chart of cable radial direction damage fault, and assessment method can be to cable radial direction lesion mimic
The cable that unit simulation obtains is tested and assessed, and the following are a specific embodiments, specifically includes the following steps:
1) instrument for measuring partial discharge is utilized, test obtains the spectrum of the electric discharge amplitude distribution (PDHD) without radial damage fault cable
F0,qi, after 5 tests, it is averaged, as reference electric discharge amplitude distribution spectrum；Wherein, q is the discharge capacity in test process,
Range is 100pC-2000pC, F0,qiFor each discharge capacity qiUnder the averaged discharge frequency, qiTake a little between be divided into 100pC, i is 1~
20；After the same method, test obtains the electric discharge amplitude distribution spectrum F of assessment cable XX,qi。
2) F is composed to reference electric discharge amplitude distribution respectively0,qiF is composed with assessment cable discharge amplitude distributionX,qiAs follows into
Row data processing and the conversion of Weibull distribution profile:
In formula, P0(qi) and PX(qi) it is respectively distribution profile F under reference and assessment state0,qiAnd FX,qiMiddle discharge capacity qiOut
Current representative probability value；
N0(qi)=- ln [1-P0(qi)]
NX(qi)=- ln [1-PX(qi)]
In formula, N0(q) and NxIt (q) is respectively the? vertical axis component of Weibull distribution profile under reference state and under assessment state；
Weibull after converted is distributed spectral coordinate, can calculate to obtain parameter alpha0、β0、αX、βX:
In formula, α0、β0Scale parameter and form parameter, α respectively under reference stateX、βXThen join for scale under assessment state
Several and form parameter；Scale parameter α0With αXPhysics dimension with discharge capacity is distribution profile F0(qi) and and FX(qi) in occur
The accumulated probability of electric discharge respectively reaches discharge capacity size when 63.2% or more.ε0、εXThen respectively indicate reference and assessment state
Under, distribution profile F0(qi) and Fx(qi) in each discharge capacity qiProbability of occurrence carries out after adding up, taking a little when reaching 63.2% or more
Number；And ε0、εXMeet following relationship: ε0,εX∈[1,20]；Form parameter β0And βXIt is then a nondimensional characteristic parameter, with
The state of sample to be tested is closely related, is determined by relational expression in above formula.
3) the Weibull distributed model parameter alpha being calculated in step 3.3 is utilized0、β0、αX、βX, construct respectively without reason
Barrier state and to Weibull distributed model function curve G under assessment state0(q) and GX(q), and curve maximum is calculated separately out partially
Shifting amount D0And DX, it is as follows:
In formula, i is integer, 1≤i≤20；qiFor the discharge capacity size of i-th of test point in step 3.1 and 3.2；
Weibull distribution profile deviation ratio η is calculated, as follows:
4) judge the size of distribution profile deviation ratio η,
If η≤1.2, cable of testing and assessing is without radial damage；If 1.2 < η≤2.0, the cable X that tests and assesses is slight radial damage；
If η > 2.0, cable moderate of testing and assessing or severe are radially damaged, and further calculate cable X radial direction Damage coefficient σ to be tested and assessedX,
In formula, αX、βXFor Weibull distributed model parameter under the state to assessment obtained in step 3.3；
If σX< 500, then the cable X that tests and assesses are that moderate is radially damaged；If 500 < σX< 1000, then the cable X that tests and assesses are that severe is radial
Damage.
Claims (1)
1. radial lesion mimic and test method under the influence of a kind of cable abnormal hot spots, which is characterized in that including simulation below
And testing procedure:
Step 1: assembling cable radial direction lesion mimic device；
1.1: the cable radial direction lesion mimic device, including lagging casing (1), the bottom in lagging casing (1) are provided with left cross
To moving track (32) and right transverse shifting track (33)；
1.2: the cable radial direction lesion mimic device, further includes the first support component (27) and the second support component (25)；It is described
First support component (27) includes the left support column being erected on left transverse shifting track (32) and is erected at right transverse shifting rail
Right support column on road (33), left and right support column are separately connected the left and right both ends of longitudinal movement track 1 (29)；Vertically move rail
On road 1 (29), one or two longitudinally movable U-shaped folder is set with by lifting device and has 1 (4)；U-shaped folder tool includes being used for
The U-shaped folder head laterally or longitudinally of cable is clamped, is additionally provided with temperature sensor 1 (3) and heating component 1 (5) on U-shaped folder head；
Second support component (25) is identical as the first support component (27) structure；
1.3: further including the controller for controlling the heating component 1 (5) such as the cable radial direction lesion mimic device in step 1.1
(21), the environment temperature sensor (18) internal in lagging casing (1), and lateral graduated scale (24) and longitudinal graduated scale are set
1(26)；
1.4: further including identical with the first support component (27) structure such as the cable radial direction lesion mimic device in step 1.1
Third support component (22)；
Step 2: the damage of cable radial direction is handled under the influence of abnormal hot spots；
2.1: preparing completely new test cable (28), be fixed in U-shaped folder and have 1 (4), 2 (8) of U-shaped folder tool, 3 (12) of U-shaped folder tool
On, and make above-mentioned 3 U-shaped folders tool in horizontal distribution, keep heating component 1 (5), heating component 2 (9), heating component 3 (13)
Temperature be 80 DEG C~90 DEG C, carry out processing in 4~5 hours, obtain the test cable not damaged radially；
2.2: preparing completely new test cable (28), be fixed in U-shaped folder and have 1 (4), 2 (8) of U-shaped folder tool, 3 (12) of U-shaped folder tool
On, and U-shaped folder is made to have the top that 1 (4) are in longitudinal movement track 1 (29), U-shaped folder has 2 (8) and is located at longitudinal movement track
The middle position of 2 (30), U-shaped folder have 3 (12) and are located at former horizontal position, keep heating component 1 (5), heating component 2 (9), heating
The temperature of component 3 (13) is 100 DEG C~110 DEG C, carries out processing in 10~15 hours, obtains the test slightly radially damaged electricity
Cable；
2.3: preparing completely new test cable (28), be fixed in U-shaped folder and have 4 (34), 5 (36) of U-shaped folder tool, U-shaped folder tool 3
(12) on, and U-shaped folder is made to have the top that 5 (36) are in longitudinal movement track 3 (31), U-shaped folder has 4 (34) and is located at longitudinal move
The middle position in dynamic rail road 2 (30), U-shaped folder have 3 (12) and are located at former horizontal position, keep heating component 4 (35), heating component 5
(37), the temperature of heating component 3 (13) is 130 DEG C~140 DEG C, carries out processing in 30~40 hours, obtains moderate and radially damages
Test cable；
2.4: preparing completely new test cable (28), be fixed in U-shaped folder and have 4 (34), 5 (36) of U-shaped folder tool, U-shaped folder tool 3
(12) on, and U-shaped folder is made to have the intermediate ends that 5 (36) are in longitudinal movement track 3 (31), U-shaped folder has 4 (34) and is located at longitudinal move
The top in dynamic rail road 2 (30), U-shaped folder have 3 (12) and are located at former horizontal position, keep heating component 4 (35), heating component 5
(37), the temperature of heating component 3 (13) is 140 DEG C~150 DEG C, carries out processing in 60~80 hours, obtains severe and radially damages
Test cable；
Step 3: the test radially damaged under the influence of cable abnormal hot spots；
For step 1 in step 2 through handling the obtained test cable Bu Tong radially damaged, to it under the influence of abnormal hot spots
Obtained radial damage is tested, comprising the following steps:
3.1: taking trouble-free cable, test cable electric discharge frequency distribution profile is repeated several times using instrument for measuring partial discharge；By institute
There is cable discharge frequency distribution profile to be averaged, the reference electric discharge frequency distribution profile F as fault-free cable0,qi；Wherein, qiFor
Discharge capacity in test process, range 100pC-2000pC, F0,qiFor each discharge capacity qiUnder mean discharge number, qiTake
100pC is divided between point, the value range of i meets: i ∈ [1,20]；
3.2: taking faulty cable to be tested and assessed, the test cable electric discharge frequency is repeated several times using instrument for measuring partial discharge and is distributed
Spectrum；All cable discharge frequency distribution profiles are averaged, the assessment electric discharge frequency distribution profile F as assessment cablex,qi；Its
In, qiFor the discharge capacity in test process, range 100pC-2000pC, Fx,qiFor each discharge capacity qiUnder mean discharge number,
qiTake a little between be divided into 100pC, the value range of i meets: i ∈ [1,20]；
3.3: to reference electric discharge frequency distribution profile F0,qiWith assessment electric discharge frequency distribution profile Fx,qiThe conversion of Weibull distribution profile is carried out,
Firstly, determine the probability of happening of each discharge capacity, it is as follows:
In formula, P0(qi) and Px(qi) it is respectively distribution profile F under reference and assessment state0,qiAnd Fx,qiMiddle discharge capacity qiInstitute when appearance
The probability value of representative；I is integer, and 1≤i≤20；qiFor the electric discharge of i-th of test point in test process described in step 3.2
Amount；Then, the conversion of? vertical axis component is carried out, as follows:
N0(qi)=- ln [1-P0(qi)],
NX(qi)=- ln [1-PX(qi)]；
In formula, N0(qi) and Nx(qi) it is respectively the? vertical axis component of Weibull distribution profile under reference and assessment state；Finally, utilizing
Weibull after conversion is distributed spectral coordinate, can calculate to obtain Weibull distributed model parameter alpha0、β0、αx、βx, it is as follows:
In formula, α0、β0Scale parameter and form parameter, α respectively under unfaulty conditionsx、βxThen join for scale under faulty state
Several and form parameter；Scale parameter α0With αxPhysics dimension with discharge capacity is electric discharge frequency distribution profile F0,qiAnd Fx,qiIn go out
The accumulated probability now discharged respectively reaches discharge capacity size when 63.2% or more；And ε0、εxMeet following relationship: ε0,εx∈
[1,20]；Form parameter β0And βxIt is nondimensional characteristic parameter；
Step 4: calculated Weibull distributed model parameter alpha0、β0、αx、βx, unfaulty conditions and to be measured is constructed respectively
Weibull distributed model function curve under state, and calculated curve maximum offset are commented, as follows:
Firstly, Weibull distributed model function curve G under the non-malfunction constructed0(q) and corresponding maximum offset D0
It is respectively as follows:
In formula, i is integer, 1≤i≤20；qiFor the discharge capacity size of i-th of test point；
Then, construct to Weibull distributed model function curve G under assessment statex(q) and corresponding maximum offset Dx
It is respectively as follows:
In formula, i is integer, 1≤i≤20；qiFor the discharge capacity size of i-th of test point；
Step 5: Weibull distribution profile deviation ratio η is calculated, as follows:
Step 6: analysis determines, comprising:
According to the value range of η, cable of testing and assessing is radially to damage without radial damage, slight radial damage, moderate or severe, if surveying
Commenting cable is that moderate or severe are radially damaged, and further progress determination step 7 calculates the radial Damage coefficient of cable to be tested and assessed
σX；
Step 7: calculating the radial Damage coefficient σ of state cable to be tested and assessedX, it is as follows:
In formula, αx、βxThe parameter of Weibull distributed model function curve under the faulty state to assessment respectively obtained；
According to radial Damage coefficient σXDetermine that assessment cable radially damages for moderate radial direction degree of injury or severe.
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