CN108872797B - A kind of radial local lesion mimic and test method of making moist of cable - Google Patents
A kind of radial local lesion mimic and test method of making moist of cable Download PDFInfo
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- CN108872797B CN108872797B CN201810958142.7A CN201810958142A CN108872797B CN 108872797 B CN108872797 B CN 108872797B CN 201810958142 A CN201810958142 A CN 201810958142A CN 108872797 B CN108872797 B CN 108872797B
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- G—PHYSICS
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- 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 radial part dampness lesion mimic methods of cable, bottom in the shielded box of simulator is provided with left and right transverse direction and slides bar, the left and right support column of first support component, left and right support column is separately connected longitudinal left and right both ends for sliding bar, it slides on bar longitudinal direction, it is set with U-shaped folder tool by lifting device, U-shaped folder tool includes the U-shaped folder head laterally or longitudinally for clamping cable, is additionally provided with wedge-shaped hollow acupuncture group part on U-shaped folder head.Detection method includes obtaining with reference to electric discharge frequency distribution profile and electric discharge frequency distribution profile, being fitted and obtain frequency spectrum mathematical model, the integral difference of digital simulation frequency curve mathematic model and calculate damage line maximum offset.Simulator can realize the different simulations radially damaged；Detection method is compared by reference to the model difference of frequency curve and test frequency curve, and test frequency curve selftest information, accurate judgement test cable degree of impairment.
Description
Technical field
The invention belongs to electrical system cable fault fields, and in particular to a kind of radial part dampness lesion mimic of cable with
Test method.
Background technique
In recent years, rapidly, operating in daily trip for motor-car plays more and more important angle for electric railway development
Color, and motor-car cable carries the important function of conveying electric energy, so the safe operation of motor-car cable is directly related to traffic fortune
It is defeated whether being capable of normal operation.In actual moving process, due to motor-car structure and the characteristics of working line, motor-car
For cable it occur frequently that different degrees of bending distorts, and in bending place, the various performances declines of cable are more subject to moisture intrusion,
With the increase of running time, moisture can be spread around in invasion point, motor-car cable is caused radial part dampness damage occur,
Its working performance is seriously affected, motor-car safe operation is threatened.Therefore the simulation of the radial part dampness damage of research motor-car cable, and
It is very necessary damage check to be carried out to test cable.
It is well known that motor-car cable in actual motion use it occur frequently that bent radial, but at bent radial
Moisture intrusion is than more random, so being often difficult to obtain different degrees of radial part dampness damage cable；And at present for electricity
Cable fault condition generally uses detection method for local discharge, but there is no specific sides for the radial part dampness of motor-car cable
Method is detected, so being badly in need of a kind of more convenient, quick, controllable side for the radial part dampness damage of research motor-car cable
The different degrees of radial part dampness damage of method dummycable, and can be on the basis of the radial part dampness lesion mimic to survey
It tries cable and carries out damage check, there is great engineering value and theory to anticipate the safe and effective O&M of the following motor-car cable
Justice.
Summary of the invention
The object of the present invention is to provide a kind of radial part dampness lesion mimic methods of cable.
Realize that the technical solution of the object of the invention is as follows:
A kind of cable radial local make moist lesion mimic and test method, including simulation below and testing procedure:
Step 1: the radial part dampness lesion mimic device of assembling cable；
1.1: the radial part dampness lesion mimic device of the cable, including shielded box (1), the bottom in shielded box (1) are set
It is equipped with that left transverse direction slides bar (23) and right transverse direction slides bar (35)；
1.2: the radial part dampness lesion mimic device of the cable, further includes the first support component (22) and the second support group
Part (25)；First support component (22) includes being erected at left transverse direction to slide the left support column on bar (23) and be erected at right cross
To the right support column slided on bar (35), left and right support column is separately connected longitudinal left and right both ends for sliding bar (32)；It is longitudinal sliding
On row bar (32), one or two longitudinally movable U-shaped folder tool (12) is set with by lifting device；U-shaped folder tool includes using
Wedge-shaped hollow acupuncture group part (11) is additionally provided in the U-shaped folder head laterally or longitudinally of clamping cable, on U-shaped folder head；
Second support component (25) is identical as the first support component (22) structure；
1.3: the radial part dampness lesion mimic device of the cable, further includes lateral graduated scale (26) and longitudinal graduated scale
(13)；
1.4: the radial part dampness lesion mimic device of the cable, further includes identical with the first support component (22) structure
Third support component (28)；
Step 2: the radial part dampness lesion mimic processing of cable；
2.1: preparing completely new test cable, put it into 40 DEG C of thermostatic drying chambers 12 hours, obtain without radial part
Make moist the cable damaged；
2.2: prepare completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable into
The dampness damage processing of row part, 15 ° of test cable are bent, injects 10 after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
The distilled water of milliliter carries out the voltage-controlled processing of 70kPa hydraulic pressure in 4 hours, obtains the test cable of slight radial part dampness damage；
2.3: prepare completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable into
The dampness damage processing of row part, 90 ° of test cable are bent, injects 10 after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
The distilled water of milliliter carries out the voltage-controlled processing of 700kPa hydraulic pressure in 8 hours, obtains the test electricity of the radial part dampness damage of moderate
Cable；
2.4: prepare completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable into
The dampness damage processing of row part, 180 ° of test cable are bent, injects 10 after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
The distilled water of milliliter carries out the voltage-controlled processing of 7MPa hydraulic pressure in 12 hours, obtains the test cable of the radial part dampness damage of severe；
4 grade fault degrees that radial part dampness lesion mimic is realized, successively mark are as follows: failure 0, failure 1, failure
2, failure 3.
Step 3: the detection of the radial part dampness damage fault of cable；
For the test cable for the Bu Tong radial part dampness damage that step 1 obtains after processing with step 2, to its radial direction
Degree of injury is tested, comprising the following steps:
3.1: taking fault-free cable, using instrument for measuring partial discharge, averagely selected in discharge capacity range 100pC-2000pC
The discharge capacity of m+1 test point is taken, the discharge capacity of i-th of test point is denoted as qi, i ∈ [1, m+1] successively tests each electric discharge and measures
Electric discharge frequency value under pilot, for each discharge capacity test point after k test, record obtains k electric discharge frequency value of the test pointI.e.Indicate the electric discharge frequency value of the jth time test of i-th of discharge capacity test point, j ∈ [1, k] takes qiLower k times
The average value of the discharge time of test, is denoted asTo draw electric discharge frequency distribution PDHD spectrum, as the reference electric discharge frequency point
Cloth spectrum；
3.2: taking the cable to be tested there are failure, obtain q respectively by the method for step 3.1iUnder k electric discharge frequency valueI.e.Indicate the electric discharge frequency value of the jth time test of i-th of discharge capacity test point, j ∈ [1, k] takes qiLower k
The average value of the discharge time of secondary test, is denoted asTo draw electric discharge frequency distribution PDHD spectrum, as electric discharge frequency to be measured
Secondary distribution profile；
3.3: reference electric discharge frequency distribution profile being fitted using Newton interpolation method, obtains corresponding frequency spectrum mathematical modulo
Type Y0(q) as follows:
Y0(q)=ε1+ε2(q-q1)+ε3(q-q1)(q-q2)+ε4(q-q1)(q-q2)(q-q3)+····+εn(q-q1)
(q-q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnFor the discharge capacity of test point；For frequency spectrum mathematical model Y0
(q) first coefficient,It is the reference electric discharge frequency value of the 1st discharge capacity test point of fault-free cable；ε2、ε3、ε4Lεn
Respectively indicate frequency spectrum mathematical model Y0(q) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1]；Wherein,
…
y0[q1,q2····,qn-1,qn] indicateDifference related coefficient；
3.4: treating measuring electricity frequency distribution profile in the way of described in 3.3 and be fitted, obtain corresponding frequency spectrum mathematics
Model YX(q) as follows:
YX(q)=β1+β2(q-q1)+β3(q-q1)(q-q2)+β4(q-q1)(q-q2)(q-q3)+····+βn(q-q1)
(q-q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnIt is the discharge capacity of test point；For frequency spectrum mathematical model YX
(q) first coefficient,It is the electric discharge frequency value to be measured of the 1st discharge capacity test point of cable under test, β2、β3、β4LβnPoint
It Biao Shi not frequency spectrum mathematical model YX(q) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1], wherein
…
yX[q1,q2····qn-1,qn] indicateDifference phase relation
Number；
3.5: the integral difference Δ Y of digital simulation frequency curve mathematic modelXi；
Fitting frequency curve within the scope of 100pC-2000pC is divided according to m+1 test point in step 3.1 and 3.2
For m calculation of sector, each section is with the left end discharge capacity q in the sectioniLower target i is as section label, for each section
Y in section0(q) and YX(q) integral difference solution, the integral difference Δ Y of each section spectrum curve model are carried outXiAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiFor the electric discharge of i-th of test point in step 3.1 and 3.2
Amount；
3.6: damage line maximum offset δ is calculated, as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiFor the electric discharge of i-th of test point in step 3.1 and 3.2
Amount.
Further, further comprising the steps of:
Step 1: judging maximum offset δ, test cable is without radial part dampness damage if δ≤1；If 1 δ≤1.5 <,
Then the slight radial part dampness damage of test cable continues step 2 as δ > 1.5；
Step 2: calculate radial part dampness Damage coefficient ξ:
In formula, λmaxIt for very big damage ratio, indicates in m+1 test point, each test point carries out all when k test
More than or equal to average valueDischarge time proportion；It is all when each test point carries out k test be greater than
Equal to average valueElectric discharge frequency value, b indicate each point k times test after all numbers more than or equal to average value；I table
Show that i-th of discharge capacity test point, the range of i meet: i ∈ [1, m+1]；P is indicated in the data for being more than or equal to average value at b times
The range of p-th of data, p meets: p ∈ [1, b]；λminFor minimum damage ratio, each test point in m+1 test point is indicated
It carries out all less than average value when k testDischarge time proportion；It is that each test point carries out k survey
It is all when examination to be less than average valueElectric discharge frequency value, c indicate each point k times test after all numbers less than average value,
I indicates that i-th of discharge capacity test point, the range of i meet: i ∈ [1, m+1]；L is indicated in the data for being less than average value at c times
The range of first of data, l meets: l ∈ [1, c]；
Step 3: if ξ≤1.5, test cable is the moderate locally radial damage of dampness；If 1.5 ξ≤4.5 <, are tested
Cable is the severe locally radial damage of dampness, if when ξ > 4.5, radial part dampness damage will seriously affect cable just
Often detection, should stop simulation test immediately.
The beneficial effects of the present invention are:
(1) radial part dampness lesion mimic of the invention can be by adjusting each the lateral of U-shaped folder tool, longitudinal direction and height
Relative position, facilitate and realize different simulations radially damaged；
(2) radial part dampness damage detecting method of the invention can be by reference to frequency curve and test frequency curve
Model difference comparison, and damage frequency curve selftest information difference, more precisely judge test cable damage
Situation.
Detailed description of the invention
Fig. 1 is the structure chart of the radial part dampness lesion mimic device of cable.
Fig. 2 is the top view of the radial part dampness lesion mimic device of cable.
Fig. 3 is the flow chart of the radial part dampness damage detecting method of cable.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.
Fig. 1, Fig. 2 show failure simulation device structural schematic diagram of the present invention, including shielded box (1), height adjustment knob 1
(2), wedge-shaped hollow acupuncture group part 1 (3), U-shaped folder have 1 (4), longitudinal graduated scale 1 (5), height adjustment knob 2 (6), wedge-shaped hollow
Acupuncture group part 2 (7), U-shaped folder have 2 (8), longitudinal graduated scale 2 (9), height adjustment knob 3 (10), wedge-shaped hollow acupuncture group part 3
(11), U-shaped folder has 3 (12), longitudinal graduated scale 3 (13), 4 (33) of U-shaped folder tool, U-shaped folder tool 5 (34), signal transmission test trunk
(14), cable termination input port (15), bushing (16), connecting test platform (17), setting adjuster (18), data are shown
Device (19), Coast-down check pointer 1 (21), support component 3 (22), laterally slides bar 1 (23), is laterally sliding test controller (20)
Row bar 2 (35), Coast-down check pointer 2 (24), support component 2 (25), lateral graduated scale (26), Coast-down check pointer 3 (27), branch
Support component 1 (28), test cable (29), bar 1 (30) is slided in longitudinal direction, bar 2 (31) is slided in longitudinal direction, bar 3 (32) is slided in longitudinal direction；It is described
Height adjustment knob 1 (2), height adjustment knob 2 (6), height adjustment knob 3 (10) can respectively according to it is longitudinal slide bar 1 (30),
Bar 2 (31) is slided in longitudinal direction, longitudinal altitude scale slided on bar 3 (32) adjusts U-shaped folder and has 1 (4), U-shaped folder 2 (8) of tool and U-shaped folder
Has the height of 3 (12), to adjust the height of test cable (29) key position；The support component 1 (28), support component 2
(25), support component 3 (22) is respectively connected with and longitudinally slides bar 1 (30), bar 2 (31) is slided in longitudinal direction, bar 3 (32) is slided in longitudinal direction, U-shaped
Fixture 1 (4), U-shaped folder have 2 (8), U-shaped folder has 3 (12) can be by longitudinal graduated scale 1 (5), longitudinal graduated scale 2 (9), longitudinal scale
Ruler 3 (13) control longitudinal sliding position longitudinally slide bar 1 (30), it is longitudinal slide bar 2 (31), it is longitudinal slide it is sliding on bar 3 (32)
Row；The support component 1 (28), support component 2 (25), support component 3 (22) are connected to transverse direction and slide bar 1 (23), transverse direction
It slides on bar 2 (35), left and right can be carried out on sliding bar and is slided, the lateral graduated scale (26) and Coast-down check pointer 1
(21), Coast-down check pointer 2 (24), Coast-down check pointer 3 (27) are to control lateral sliding position；The wedge-shaped hollow needle
Pierce component 1 (3), wedge-shaped hollow acupuncture group part 2 (7), wedge-shaped hollow acupuncture group part 3 (11) to test cable (29) bending part into
Row spine defect processing, and water flood treatment can be carried out at spine position；The setting adjuster (18), data display equipment
(19), test controller (20) can control spine position hydraulic pressure and water injection time, realize the part dampness mould of test cable (29)
It is quasi-.
The analogy method of the radial part dampness lesion mimic of cable are as follows: have by adjusting each U-shaped folder on test cable (29)
Height, lateral position and lengthwise position, make test cable (29) occur bent radial damage；By to test cable (29) diameter
Spine processing is carried out to bending part, and by setting adjuster (18), data display equipment (19), test controller (20) to point
Thorn position carries out the control of water filling pressure and water injection time, realizes the purpose that simulation test cable (29) locally make moist, specifically:
Prepare completely new test cable, put it into 40 DEG C of thermostatic drying chambers 12 hours, obtains without radial part dampness
The cable of damage is denoted as failure 0；
Prepare completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable carry out office
Portion's dampness damage processing, 90 ° of test cable are bent, and inject 10 milliliters after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
Distilled water, carry out the voltage-controlled processing of 700kPa hydraulic pressure in 8 hours, obtain the test cable of the radial part dampness damage of moderate, mark
It is shown as failure 2；
Fig. 3 show the flow chart of the radial part dampness damage detecting method of cable, and this method can be to aforementioned cable diameter
The cable dampness failure simulated to part dampness fault simulator is tested and assessed, and the following are a specific embodiment, packets
Include following steps:
Step 1: the fault-free cable of characterization failure 0 is selected, using instrument for measuring partial discharge, in discharge capacity range
The discharge capacity of m+1 test point is averagely chosen in 100pC-2000pC, i-th of discharge capacity test point is denoted as qi, i ∈ [1, m+1],
Successively test each discharge capacity test point qiUnder electric discharge frequency value, each discharge capacity test point qiAfter k test, record is somebody's turn to do
K electric discharge frequency value of test pointI.e.Indicate the electric discharge frequency of the jth time test of i-th of discharge capacity test point
Value, j ∈ [1, k] take qiThe average value of the discharge time of lower k test, is denoted asTo draw electric discharge frequency distribution PDHD
Spectrum, as reference electric discharge frequency distribution profile, wherein m value is that 100, k value is 20；
Step 2: the cable to be tested of the moderate dampness of characterization failure 2 is selected, obtains q respectively by the method for step 1iUnder
K electric discharge frequency valueI.e.Indicate the electric discharge frequency value of the jth time test of i-th of discharge capacity test point, j ∈
[1, k], takes qiThe average value of the discharge time of lower k test, is denoted asTo draw electric discharge frequency distribution PDHD spectrum, make
For electric discharge frequency distribution profile to be measured, wherein m value is that 100, k value is 20；
Step 3: reference electric discharge frequency distribution profile is fitted using Newton interpolation method, obtains corresponding spectrum number
Learn model Y0(q) as follows:
Y0(q)=ε1+ε2(q-q1)+ε3(q-q1)(q-q2)+ε4(q-q1)(q-q2)(q-q3)+····+εn(q-q1)
(q-q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnFor the discharge capacity of test point；For frequency spectrum mathematical model Y0
(q) first coefficient,It is the reference electric discharge frequency value of the 1st discharge capacity test point of fault-free cable；ε2、ε3、ε4Lεn
Respectively indicate frequency spectrum mathematical model Y0(q) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1]；Wherein,
…
y0[q1,q2····,qn-1,qn] indicateDifference related coefficient；
Step 4: measuring electricity frequency distribution profile is treated in the way of described in step 3 and is fitted, corresponding frequency is obtained
Compose mathematical model Y2(q) as follows:
Y2(q)=β1+β2(q-q1)+β3(q-q1)(q-q2)+β4(q-q1)(q-q2)(q-q3)+····+βn(q-q1)
(q-q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnIt is the discharge capacity of test point；For frequency spectrum mathematical model YX
(q) first coefficient,It is the electric discharge frequency value to be measured of the 1st discharge capacity test point of cable under test, β2、β3、β4LβnPoint
It Biao Shi not frequency spectrum mathematical model Y2(f) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1], wherein
…
y2[q1,q2····qn-1,qn] indicateDifference related coefficient；
Step 5: the integral difference Δ Y of digital simulation frequency curve mathematic model2i；
Fitting frequency curve within the scope of 100pC-2000pC is divided according to m+1 test point in step 3.1 and 3.2
For m calculation of sector, each section is with the left end discharge capacity q in the sectioniLower target i is as section label, for each section
Y in section0(q) and Y2(q) integral difference solution, the integral difference Δ Y of each section spectrum curve model are carried out2iAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiIt is put for i-th test point in step 1 and step 2
Electricity；
Step 6: calculating damage line maximum offset δ, as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiIt is put for i-th test point in step 1 and step 2
Electricity；
δ=2.3 are calculated；
Step 7: judging maximum offset δ, works as p > 1.5, continues step 8；
Step 8: radial part dampness Damage coefficient ξ is calculated:
In formula, λmaxIt for very big damage ratio, indicates in m+1 test point, each test point carries out all when k test
More than or equal to average valueDischarge time proportion；It is all when each test point carries out k test be greater than
Equal to average valueElectric discharge frequency value, b indicate each point k times test after all numbers more than or equal to average value；I is indicated
The range of i-th of discharge capacity test point, i meets: i ∈ [1, m+1]；P indicates the in the data at b time more than or equal to average value
The range of p data, p meets: p ∈ [1, b]；λminIt for minimum damage ratio, indicates in m+1 test point, each test clicks through
It is all when k test of row to be less than average valueDischarge time proportion；It is that each test point carries out k test
Shi Suoyou is less than average valueElectric discharge frequency value, c indicate each point k times test after all numbers less than average value, i table
Show that i-th of discharge capacity test point, the range of i meet: i ∈ [1, m+1]；L indicates the l in the data for being less than average value at c times
The range of a data, l meets: l ∈ [1, c]；
ξ=0.84 is calculated.
Step 9: the size of the radial part dampness Damage coefficient ξ of judgement, ξ≤1.5 then judge test cable for moderate office
The radial damage of portion's dampness.
Claims (1)
1. a kind of radial part dampness lesion mimic of cable and test method, which is characterized in that including simulation below and test
Step:
Step 1: the radial part dampness lesion mimic device of assembling cable；
1.1: the radial part dampness lesion mimic device of the cable, including shielded box (1), the bottom in shielded box (1) are provided with
Left transverse direction slides bar (23) and right transverse direction slides bar (35)；
1.2: the radial part dampness lesion mimic device of the cable, further includes the first support component (22) and the second support component
(25)；First support component (22) includes being erected at left transverse direction to slide the left support column on bar (23) and be erected at right transverse direction
The right support column on bar (35) is slided, left and right support column is separately connected longitudinal left and right both ends for sliding bar (32)；It slides longitudinal direction
On bar (32), one or two longitudinally movable U-shaped folder tool (12) is set with by lifting device；U-shaped folder tool includes being used for
The U-shaped folder head laterally or longitudinally of cable is clamped, is additionally provided with wedge-shaped hollow acupuncture group part (11) on U-shaped folder head；
Second support component (25) is identical as the first support component (22) structure；
1.3: the radial part dampness lesion mimic device of the cable, further includes lateral graduated scale (26) and longitudinal graduated scale (13)；
1.4: the radial part dampness lesion mimic device of the cable, further includes third identical with the first support component (22) structure
Support component (28)；
Step 2: the radial part dampness lesion mimic processing of cable；
2.1: preparing completely new test cable, put it into 40 DEG C of thermostatic drying chambers 12 hours, obtain without radial part dampness
The cable of damage；
2.2: preparing completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable carry out office
Portion's dampness damage processing, 15 ° of test cable are bent, and inject 10 milliliters after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
Distilled water, carry out the voltage-controlled processing of 70kPa hydraulic pressure in 4 hours, obtain the test cable of slight radial part dampness damage；
2.3: preparing completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable carry out office
Portion's dampness damage processing, 90 ° of test cable are bent, and inject 10 milliliters after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
Distilled water, carry out the voltage-controlled processing of 700kPa hydraulic pressure in 8 hours, obtain the test cable of the radial part dampness damage of moderate；
2.4: preparing completely new test cable, using the radial part dampness lesion mimic device of cable, to test cable carry out office
Portion's dampness damage processing, 180 ° of test cable are bent, and inject 10 milliliters after knee is pierced into 2 wedge-shaped hollow acupuncture group parts
Distilled water, carry out the voltage-controlled processing of 7MPa hydraulic pressure in 12 hours, obtain the test cable of the radial part dampness damage of severe；
Step 3: the detection of the radial part dampness damage fault of cable；
For the test cable for the Bu Tong radial part dampness damage that step 1 obtains after processing with step 2, it is radially damaged
Degree is tested, comprising the following steps:
3.1: taking fault-free cable, using instrument for measuring partial discharge, averagely choose m+1 in discharge capacity range 100pC-2000pC
The discharge capacity of the discharge capacity of a test point, i-th of test point is denoted as qi, i ∈ [1, m+1] successively tests each discharge capacity test point
Under electric discharge frequency value, each discharge capacity test point through k times test after, record obtain k electric discharge frequency value of the test pointI.e.Indicate the electric discharge frequency value of the jth time test of i-th of discharge capacity test point, j ∈ [1, k] takes qiLower k times
The average value of the discharge time of test, is denoted asTo draw electric discharge frequency distribution PDHD spectrum, as the reference electric discharge frequency point
Cloth spectrum；
3.2: taking the cable to be tested there are failure, obtain q respectively by the method for step 3.1iUnder k electric discharge frequency valueI.e.Indicate the electric discharge frequency value of the jth time test of i-th of discharge capacity test point, j ∈ [1, k] takes qiLower k times
The average value of the discharge time of test, is denoted asTo draw electric discharge frequency distribution PDHD spectrum, as the electric discharge frequency to be measured
Distribution profile；
3.3: reference electric discharge frequency distribution profile being fitted using Newton interpolation method, obtains corresponding frequency spectrum mathematical model Y0
(q) as follows:
Y0(q)=ε1+ε2(q-q1)+ε3(q-q1)(q-q2)+ε4(q-q1)(q-q2)(q-q3)+····+εn(q-q1)(q-
q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnFor the discharge capacity of test point；For frequency spectrum mathematical model Y0(q)
One coefficient,It is the reference electric discharge frequency value of the 1st discharge capacity test point of fault-free cable；ε2、ε3、ε4、…、εnRespectively
Indicate frequency spectrum mathematical model Y0(q) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1]；Wherein,
…
y0[q1,q2····,qn-1,qn] indicateDifference related coefficient；
3.4: treating measuring electricity frequency distribution profile using method described in 3.3 and be fitted, obtain corresponding frequency spectrum mathematical model
YX(q) as follows:
YX(q)=β1+β2(q-q1)+β3(q-q1)(q-q2)+β4(q-q1)(q-q2)(q-q3)+····+βn(q-q1)(q-
q2)····(q-qn-1)
In formula, q1,q2,····qn-1,qnIt is the discharge capacity of test point；For frequency spectrum mathematical model YX(q)
First coefficient,It is the electric discharge frequency value to be measured of the 1st discharge capacity test point of cable under test, β2、β3、β4、…、βnRespectively
Indicate frequency spectrum mathematical model YX(q) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2, m+1], wherein
…
yX[q1,q2····qn-1,qn] indicateDifference related coefficient；
3.5: the integral difference Δ Y of digital simulation frequency curve mathematic modelXi；
Fitting frequency curve within the scope of 100pC-2000pC is divided into m according to m+1 test point in step 3.1 and 3.2
A calculation of sector, each section is with the left end discharge capacity q in the sectioniLower target i is as section label, in each segment
Y0(q) and YX(q) integral difference solution, the integral difference Δ Y of each section spectrum curve model are carried outXiAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiFor the discharge capacity of i-th of test point in step 3.1 and 3.2；
3.6: damage line maximum offset δ is calculated, as follows:
In formula, i is integer, and the range of i meets: i ∈ [1, m], qiFor the discharge capacity of i-th of test point in step 3.1 and 3.2；
Step 4: judging maximum offset δ, test cable is without radial part dampness damage if δ≤1；If 1 δ≤1.5 <, are surveyed
It tries the slight radial part dampness damage of cable and continues step 5 as δ > 1.5；
Step 5: calculate radial part dampness Damage coefficient ξ:
In formula, λmaxIt for very big damage ratio, indicates in m+1 test point, each test point is all when carrying out k test to be greater than
Equal to average valueDischarge time proportion；It is all when each test point carries out k test be more than or equal to
Average valueElectric discharge frequency value, b indicate each point k times test after all numbers more than or equal to average value；I indicates i-th
The range of a discharge capacity test point, i meets: i ∈ [1, m+1]；P indicates p-th in the data for being more than or equal to average value at b times
The range of data, p meets: p ∈ [1, b]；λminIt for minimum damage ratio, indicates in m+1 test point, each test point carries out k
It is all when secondary test to be less than average valueDischarge time proportion；When being that each test point carries out k test
It is all to be less than average valueElectric discharge frequency value, c indicate each point k times test after all numbers less than average value, i table
Show that i-th of discharge capacity test point, the range of i meet: i ∈ [1, m+1]；L indicates the l in the data for being less than average value at c times
The range of a data, l meets: l ∈ [1, c]；
Step 6: if ξ≤1.5, test cable is the moderate locally radial damage of dampness；If 1.5 ξ≤4.5 <, test cable
For severe, locally dampness radial direction is damaged, if radial part dampness damages the normal inspection that will seriously affect cable when ξ > 4.5
It surveys, simulation test should be stopped immediately.
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