CN109164358B - A kind of cable integral insulation dampness fault simulation and test method - Google Patents
A kind of cable integral insulation dampness fault simulation and test method Download PDFInfo
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- CN109164358B CN109164358B CN201810958158.8A CN201810958158A CN109164358B CN 109164358 B CN109164358 B CN 109164358B CN 201810958158 A CN201810958158 A CN 201810958158A CN 109164358 B CN109164358 B CN 109164358B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention discloses a kind of cable integral insulation dampness fault simulation and test methods, the fault simulation cable of fault simulator includes the first metal layer, the first semi-conductive layer, ethylene propylene rubber insulated layer, the second semi-conductive layer, insulation screen for being from inside to outside in concentric structure, respectively corresponds cable core layer, interior semi-conductive layer, insulating layer, outer semiconducting layer and the insulation screen of cable.Dampness failure assessment method includes drawing standard frequency spectrum curve, test spectrum curve, and cable standard deviation factors calculate and Test and analysis.The beneficial effects of the present invention are: single layer is mutually indepedent inside fault simulation cable, can be individually replaced the ethylene propylene rubber insulated layer of different damp degrees, realize the simulation of different damp degree failure cables.It is tested based on fault-free cable and failure cable, failure assessment can be effectively performed according to running parameter.
Description
Technical field
The invention belongs to electrical system cable fault fields, and in particular to a kind of cable integral insulation dampness fault simulation and
Test method.
Background technique
In recent years, China's electric railway total kilometrage rapid development, motor-car cable carry the important function of conveying electric energy,
Cable use state directly affects the performance and operating safety factor of rail traffic.EMU operates in environment more and more
The changeable area of complicated condition, the probability by thunderstorm weather is larger, and motor-car cable is as the transmission of electricity component for being laid in roof,
Easily by the intrusion of moisture, cable is caused integrally to make moist the generation of failure in this case.And in high condensation area, due to sky
Gas moisture content is higher, and cable makes moist, and problem is more prominent, and under longtime running, motor-car cable is subject to moisture intrusion.Motor-car
Core of the cable as train transmission electric energy, whole dampness will seriously affect its working performance, threaten motor-car safe operation.
Therefore research motor-car cable integrally makes moist the simulation of failure, and it is very necessary to damp cable test and assess.
It is a random, accidental phenomenon since the ethylene propylene rubber insulated layer of motor-car cable integrally makes moist, it is accurate to be often difficult
The different degrees of damp cable of acquisition, while generally being studied at present using dielectric loss parameter for cable dampness problem,
But integrally making moist for cable insulation, there is no specific methods, so leading for research because ethylene propylene rubber insulated layer integrally makes moist
The different degrees of dampness of cable is sent a telegraph, is badly in need of a kind of more convenient, quick, controllable method dummycable and integrally makes moist failure, and
It can test and assess on the basis of the cable makes moist failure simulation device to fault simulation cable, this has the safety of motor-car cable
Effect operation is of great significance.
Summary of the invention
The object of the present invention is to provide a kind of cable integral insulation dampness fault simulation and test methods.
Realize that the technical solution of the object of the invention is as follows:
A kind of cable integral insulation dampness fault simulation and test method, including simulation below and testing procedure:
Step 1: the assembling of cable integral insulation dampness fault simulator；
The 1.1 dampness fault simulators, including fault simulation cable (7), the fault simulation cable (7) includes by interior
It is led to outer in the first metal layer (12) of concentric structure, the first semi-conductive layer (11), ethylene propylene rubber insulated layer (10), the second half
Electric layer (9), insulation screen (8) respectively correspond cable core layer, interior semi-conductive layer, insulating layer, outer semiconducting layer and the insulation of cable
Shielded layer；
The 1.2 dampness fault simulators further include that No. 1 annular of the setting in one end of the fault simulation cable (7) is adjustable
Fastening means (3), No. 1 annular adjustable fastening device part (3) include No. 1 fastening insulating tape (14), No. 1 U-shaped widen fastening group
Part (15) and No. 1 two-restriction fixing bolt (13) use No. 1 after No. 1 fastening insulating tape (14) winds the fault simulation cable (7)
U-shaped widen fastening assembly (15) cooperate No. 1 two-restriction fixing bolt (13) to carry out squeezed tight and fixation；
The 1.3 dampness fault simulators further include No. 4 annulars of the setting in the other end of the fault simulation cable (7)
Adjustable fastening device part (6), described No. 4 annular adjustable fastening device parts (6) are identical as No. 1 annular adjustable fastening device part (3) structure；Institute
After fault simulation cable (7) and annular adjustable fastening device part are stated using cold-contraction type full skirt (2) encapsulation, it is tight that left side is respectively adopted in both ends
Solid glue plug (1) and right side fastening rubber plug (25) fastening.
Step 2: the simulation wetting treatment of fault simulator；
2.1 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is put into 40 DEG C of thermostatic drying chambers
12 hours, state of not making moist is simulated, the undamped simulator of cable insulation is obtained；
2.2 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 12 hours,
Dampness state that simulation is slight, obtains the simulator that cable insulation slightly makes moist；
2.3 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 24 hours,
Moderate dampness state is simulated, the simulator of cable insulation moderate dampness is obtained；
2.4 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 48 hours,
Severe dampness state is simulated, the simulator of cable insulation severe dampness is obtained；
Step 3: the test of cable integral insulation dampness fault simulator；
It for the fault simulator for the different damp degrees that step 2 obtains, is assembled, is obtained not respectively according to step 1
Cable with failure integrally makes moist fault simulator, tests the fault simulator, comprising the following steps:
3.1: the cable fault simulation device for selecting state of not making moist is reference cable, in 0.01Hz~1000Hz frequency range,
16 frequency test points are chosen, the frequency of i-th of test point is denoted as fi, it is followed successively by f1=0.01Hz, f2=0.02Hz, f3=
0.05Hz, f4=0.1Hz, f5=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz, f9=5Hz, f10=10Hz, f11=
20Hz f12=50Hz, f13=100Hz, f14=200Hz, f15=500Hz, f16=1000Hz carries out its complex dielectric permittivity
Test, and take the imaginary part of complex dielectric permittivity as reference frequency response parameter value, it is denoted as16 groups obtainedData, referred to as reference frequency response parameter sequence, i are integer, i ∈ [1,16]；
3.2: taking cable fault simulation device to be tested and assessed is cable under test, in 0.01Hz~1000Hz frequency range, chooses 16
The frequency of a frequency point, i-th of test point is denoted as fi, it is followed successively by f1=0.01Hz, f2=0.02Hz, f3=0.05Hz, f4=
0.1Hz, f5=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz, f9=5Hz, f10=10Hz, f11=20Hz f12=50Hz,
f13=100Hz, f14=200Hz, f15=500Hz, f16=1000Hz, carries out the test of its complex dielectric permittivity, and takes multiple dielectric
The imaginary part of constant is denoted as frequency response parameter value to be measured16 groups obtainedData, it is referred to as to be measured
Frequency response argument sequence, i are integer, i ∈ [1,16]；
3.3: cable standard deviation factors calculate, comprising:
3.3.1 it is fitted using the reference frequency response parameter sequence that Newton interpolation method obtains test, acquisition pair
The frequency spectrum mathematical model Y answered0(f) as follows:
Y0(f)=ε1+ε2(f-f1)+ε3(f-f1)(f-f2)+ε4(f-f1)(f-f2)(f-f3)+
····+εn(f-f1)(f-f2)(f-f3)····(f-fn-1)
In formula, f1,f2,····fnFor the frequency values of test point,It is frequency spectrum mathematical model Y0(f)
First coefficient,It is the reference frequency response parameter value of the 1st frequency test point, ε2、ε3、ε4、…、εnRespectively indicate frequency
Compose mathematical model Y0(f) the 2nd, 3 ..., n coefficient, the range of n meets: n ∈ [2,16], wherein
…
y0[f1,f2,····fn-1,fn] indicateDifference related coefficient；
3.3.2: being fitted using the frequency response argument sequence to be measured that Newton interpolation method obtains test, acquisition pair
The frequency spectrum mathematical model Y answeredX(f) as follows:
YX(f)=β1+β2(f-f1)+β3(f-f1)(f-f2)+β4(f-f1)(f-f2)(f-f3)+
····+βn(f-f1)(f-f2)····(f-fn-1)
In formula, f1,f2,····fn-1,fnFor the frequency values of test point,For frequency spectrum mathematical model YX
(f) first coefficient,It is the frequency response parameter value to be measured of the 1st frequency test point, β2、β3、β4、…、βnRespectively
Indicate frequency spectrum mathematical model YX(f) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2,16], wherein
…
yX[f1,f2,····fn-1,fn] indicateDifference phase relation
Number；
3.3.3；The integral difference of digital simulation spectrum curve mathematical modelIt is as follows,
By the fitting spectrum curve within the scope of 0.01Hz~1000Hz according to step 3.1,3.2 16 frequency test click and sweep
It is divided into 15 calculation of sector, each section is with the left end frequency label f in the sectioniLower label i as section label, for every
Y in a segment0(f) and YX(f) integral difference solution, the integral difference of each section spectrum curve model are carried outAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1,15], fiFor the frequency of i-th of test point in step 3.1 and 3.2
Rate value；
3.3.4: calculating fault spectrum curve section accounting influences coefficient hi, it is as follows:
In formula, i is integer, and the range of i meets: i ∈ [1,15]；For fitting spectrum curve mathematical model integral
DifferenceAverage value, σ be fitting spectrum curve mathematical model integral differenceStandard deviation,Calculating in 3.3.3
It has been provided that,It is as follows with the expression formula of σ:
Further, further comprising the steps of:
3.3.5: calculate cable standard deviation factors λ:
Cable is normal condition if λ≤0.5, and otherwise there are failures for cable, continues analysis and determines 3.4；
3.4: defining YX(f) in, adjacent two segments integral area is poorFor
In formula, i is integer, and the range of i meets: i ∈ [1,14], fiFor the frequency values of i-th of test point；
Fault simulation cable dampness loss factor ξ is calculated, as follows:
As ξ < 5, then cable under test is slight humidified insulation；As 5≤ξ < 13.5, then cable under test be moderate insulate by
Tide；As 13.5≤ξ, then cable under test is severe humidified insulation.
The beneficial effects of the present invention are: single layer is mutually indepedent inside fault simulation cable, can be individually replaced different dampness
The ethylene propylene rubber insulated layer of degree realizes the simulation of different damp degree failure cables.Assessment method be based on fault-free cable and
Failure cable is tested, and failure assessment can be effectively performed according to running parameter.
Detailed description of the invention
Fig. 1 is the structure chart of fault simulator of the present invention.
Fig. 2 is the flow chart of cable dampness failure assessment method.
Specific embodiment
The present invention is further described combined with specific embodiments below.
Fig. 1 show fault simulation structure schematic diagram of the present invention, including left side fastening rubber plug (1), right side fasten rubber plug
(25), cold-contraction type full skirt (2), No. 1 annular adjustable fastening device part (3), No. 2 annular adjustable fastening device parts (4), 3 ring shape is adjustable
Fastening means (5), No. 4 annular adjustable fastening device parts (6), fault simulation cables (7), fault simulation cable (7) are in from inside to outside
The first metal layer (12), the first semi-conductive layer (11), the ethylene propylene rubber insulated layer (10), the second semi-conductive layer of concentric structure
(9), insulation screen (8) forms, and respectively corresponds cable core layer, interior semi-conductive layer, the insulating layer, outer semiconducting layer inside cable
And insulation screen；Positioned at No. 1 of left side annular adjustable fastening device part (3), intermediate No. 2 annular adjustable fastening device parts (4), in
Between No. 4 annular adjustable fastening device part (6) structures on 3 ring shape adjustable fastening device part (5) and right side it is identical, wherein No. 1 annular can
Adjust fastening means (3) by No. 1 two-restriction fixing bolt (13), No. 1 fastening insulating tape (14), No. 1 centre is U-shaped widens fastening assembly
(15) it forms, No. 2 annular adjustable fastening device parts (4) are by No. 2 two-restriction fixing bolts (16), No. 2 fastening insulating tapes (18), No. 2 intermediate U
Type widens fastening assembly (17) composition, and 3 ring shape adjustable fastening device part (4) is insulated by No. 3 two-restriction fixing bolts (19), No. 3 fastenings
Band (21), U-shaped widen fastening assembly (20) in No. 3 centres form, and No. 4 annular adjustable fastening device parts (6) are by No. 4 two-restriction fixing bolts
(22), No. 4 fastening insulating tapes (24), U-shaped widen fastening assembly (23) in No. 4 centres form；The fault simulation cable (7) is outside
The annular adjustable fastening device part (3) in equal No. 1 of side, No. 2 annular adjustable fastening device parts (4), 3 ring shape adjustable fastening device parts (5), No. 4
Annular adjustable fastening device part (6) carries out squeezed tight and fixation, fits closely each layer in fault simulation cable (7)；
Cable integrally makes moist the simulation wetting treatment method of fault simulator:
Prepare that its ethylene propylene rubber insulated layer (10) is put into 40 DEG C of thermostatic drying chambers completely newly to fault simulation cable (7)
12 hours, state of not making moist is simulated, the undamped simulator of cable insulation is obtained；
Prepare to be soaked into its ethylene propylene rubber insulated layer (10) in water tank 12 hours completely newly to fault simulation cable (7),
Dampness state that simulation is slight, obtains the simulator that cable insulation slightly makes moist；
Fault simulation cable (7) is the replaceable cable of insulating layer, replaces the ethylene propylene rubber insulated layer of different damp degrees
(10), fault simulation cable (7) each layer is closely overlapped using silicone grease filling technique, fault simulation cable (7) is carried out
Constant temperature pressure handle, using No. 1 fastening insulating tape (14), No. 2 fastening insulating tapes (18), No. 3 fastening insulating tapes (21), No. 4 tightly
Gu the U-shaped No. 1 dual-fastening spiral shell widened on fastening assembly (15) in No. 1 centre is successively tightened in insulating tape (24) squeezed tight and fixation
Bolt (13), the U-shaped No. 2 two-restriction fixing bolts (16) widened on fastening assembly (17) in No. 2 centres, No. 3 centres are U-shaped widens fastening group
No. 3 two-restriction fixing bolts (19) on part (20), the U-shaped No. 4 two-restriction fixing bolts (22) widened on fastening assembly (23) in No. 4 centres,
And successively install cold-contraction type full skirt (2), right side fastening rubber plug (25), left side fastening rubber plug (1) additional, realize different brackets damp degree
Fault simulation cable (7), ethylene propylene rubber insulated layer (10) the grade fault degree of made 2 correspond to characterization failure simulation electricity
Cable (7) damp degree, successively indicates are as follows: failure 00, failure 01；
Fig. 2 show the flow chart of cable dampness failure assessment method, and this method can integrally make moist to aforementioned cable former
The cable dampness failure that barrier simulator is simulated is tested and assessed.The following are a specific embodiments, comprising the following steps:
Step 1: the cable fault simulation device for selecting the state of not making moist when 00 state of characterization failure is reference cable,
In 0.01Hz~1000Hz frequency range, 16 frequency test points are chosen, the frequency of i-th of test point is denoted as fi, it is followed successively by f1=
0.01Hz, f2=0.02Hz, f3=0.05Hz, f4=0.1Hz, f5=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz, f9=
5Hz, f10=10Hz, f11=20Hz f12=50Hz, f13=100Hz, f14=200Hz, f15=500Hz, f16=1000Hz, into
The test of its complex dielectric permittivity of row, and take the imaginary part of complex dielectric permittivity as reference frequency response parameter value, it is denoted as?
16 groups arrivedData, referred to as reference frequency response parameter sequence, i are integer, i ∈ [1,16]；
Step 2: take the slight dampness that 01 state of characterization failure i.e. humidified insulation state is X=1 to cable fault simulation device
16 frequency points are chosen in 0.01Hz~1000Hz frequency range for cable under test, the frequency of i-th of test point is denoted as fi, it is followed successively by
f1=0.01Hz, f2=0.02Hz, f3=0.05Hz, f4=0.1Hz, f5=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz,
f9=5Hz, f10=10Hz, f11=20Hz f12=50Hz, f13=100Hz, f14=200Hz, f15=500Hz, f16=
1000Hz, carries out the test of its complex dielectric permittivity, and takes the imaginary part of complex dielectric permittivity as frequency response parameter value to be measured, is denoted as16 groups obtainedData, frequency response argument sequence referred to as to be measured, i are integer, i ∈ [1,16]；
Step 3: cable standard deviation factors calculate, comprising:
3.1 are fitted using the reference frequency response parameter sequence that Newton interpolation method obtains test, are corresponded to
Frequency spectrum mathematical model Y0(f) as follows:
Y0(f)=ε1+ε2(f-f1)+ε3(f-f1)(f-f2)+ε4(f-f1)(f-f2)(f-f3)+
····+εn(f-f1)(f-f2)(f-f3)····(f-fn-1)
In formula, f1,f2,····fnFor the frequency values of test point,It is frequency spectrum mathematical model Y0(f)
First coefficient,It is the reference frequency response parameter value of the 1st frequency test point, ε2、ε3、ε4、…、εnRespectively indicate frequency
Compose mathematical model Y0(f) the 2nd, 3 ..., n coefficient, the range of n meets: n ∈ [2,16], wherein
…
y0[f1,f2,····fn-1,fn] indicateDifference related coefficient；
3.2 are fitted using the frequency response argument sequence to be measured that Newton interpolation method obtains test, are corresponded to
Frequency spectrum mathematical model Y1(f) as follows:
Y1(f)=β1+β2(f-f1)+β3(f-f1)(f-f2)+β4(f-f1)(f-f2)(f-f3)+
····+βn(f-f1)(f-f2)····(f-fn-1)
In formula, f1,f2,····fn-1,fnFor the frequency values of test point,For frequency spectrum mathematical model Y1
(f) first coefficient,It is the frequency response parameter value to be measured of the 1st frequency test point, β2、β3、β4、…、βnRespectively
Indicate frequency spectrum mathematical model Y1(f) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2,16], wherein
…
y1[f1,f2,····fn-1,fn] indicateDifference related coefficient；
The integral difference of 3.3 digital simulation spectrum curve mathematical models
By the fitting spectrum curve within the scope of 0.01Hz~1000Hz according to Step 1: two 16 test points are divided into 15
A calculation of sector, each section is with the left end frequency label f in the sectioniI as section label, in each segment
Y0(f) and Y1(f) integral difference solution, the integral difference of each section spectrum curve model are carried outAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1,15], fiFor i-th test point in step 1 and step 2
Frequency values；
3.4, which calculate fault spectrum curve section accounting, influences coefficient hi
In formula, i is integer, and the range of i meets: i ∈ [1,15]；For fitting spectrum curve mathematical model integral
DifferenceAverage value, σ be fitting spectrum curve mathematical model integral differenceStandard deviation,Calculating given in 3.3
Out,It is as follows with the expression formula of σ:
3.5 calculate cable standard deviation factors λ:
λ=0.71 is calculated；
Step 4: Test and analysis, comprising:
4.1 judgment criteria deviation factors λ sizes, λ > 0.5 continue；
4.2 define the fault spectrum curve Y of 3.3 demarcation interval sections1(f) in, adjacent two segments integral area is poor
For
In formula, i is integer, and the range of i meets: i ∈ [1,14], fiFor i-th test point in step 1 and step 2
Frequency values；
4.3 calculate fault simulation cable dampness loss factor ξ
ξ=3.9 are calculated；
The size of judgement dampness loss factor ξ, because of ξ < 5, it is believed that slight humidified insulation occurs in cable.
Claims (1)
1. a kind of cable integral insulation dampness fault simulation and test method, which is characterized in that including simulation below and test
Step:
Step 1: the assembling of cable integral insulation dampness fault simulator；
The 1.1 dampness fault simulators, including fault simulation cable (7), the fault simulation cable (7) include from inside to outside
In the first metal layer (12), the first semi-conductive layer (11), ethylene propylene rubber insulated layer (10), the second semi-conductive layer of concentric structure
(9), insulation screen (8) respectively correspond cable core layer, interior semi-conductive layer, insulating layer, outer semiconducting layer and the insulation shielding of cable
Layer；
The 1.2 dampness fault simulators further include No. 1 annular Tightenable of the setting in one end of the fault simulation cable (7)
Gu device (3), No. 1 annular adjustable fastening device part (3) include No. 1 fastening insulating tape (14), No. 1 U-shaped widen fastening assembly
(15) and No. 1 two-restriction fixing bolt (13) it is U-shaped using No. 1 after, No. 1 fastening insulating tape (14) winds the fault simulation cable (7)
Widening fastening assembly (15) cooperates No. 1 two-restriction fixing bolt (13) to carry out squeezed tight and fixation；
The 1.3 dampness fault simulators further include that setting is adjustable in No. 4 annulars of the other end of the fault simulation cable (7)
Fastening means (6), described No. 4 annular adjustable fastening device parts (6) are identical as No. 1 annular adjustable fastening device part (3) structure；The event
After hindering dummycable (7) and annular adjustable fastening device part using cold-contraction type full skirt (2) encapsulation, left side fastening glue is respectively adopted in both ends
Fill in (1) and right side fastening rubber plug (25) fastening；
Step 2: the simulation wetting treatment of fault simulator；
2.1 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is put into 12 in 40 DEG C of thermostatic drying chambers
Hour, state of not making moist is simulated, the undamped simulator of cable insulation is obtained；
2.2 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 12 hours, simulate
Slight dampness state, obtains the simulator that cable insulation slightly makes moist；
2.3 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 24 hours, simulate
Moderate dampness state, obtains the simulator of cable insulation moderate dampness；
2.4 prepare completely new fault simulation cable (7), its ethylene propylene rubber insulated layer (10) is soaked into water tank 48 hours, simulate
Severe dampness state, obtains the simulator of cable insulation severe dampness；
Step 3: the test of cable integral insulation dampness fault simulator；
It for the fault simulator for the different damp degrees that step 2 obtains, is assembled respectively according to step 1, obtains different events
The cable of barrier integrally makes moist fault simulator, tests the fault simulator, comprising the following steps:
3.1: the cable fault simulation device for selecting state of not making moist is reference cable, in 0.01Hz~1000Hz frequency range, is chosen
16 frequency test points, the frequency of i-th of test point are denoted as fi, it is followed successively by f1=0.01Hz, f2=0.02Hz, f3=0.05Hz,
f4=0.1Hz, f5=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz, f9=5Hz, f10=10Hz, f11=20Hz f12=
50Hz, f13=100Hz, f14=200Hz, f15=500Hz, f16=1000Hz, carries out the test of its complex dielectric permittivity, and takes multiple
The imaginary part of dielectric constant is denoted as reference frequency response parameter value16 groups obtainedData are referred to as joined
Frequency response argument sequence is examined, i is integer, i ∈ [1,16]；
3.2: taking cable fault simulation device to be tested and assessed is that cable under test chooses 16 frequencies in 0.01Hz~1000Hz frequency range
The frequency of point, i-th of test point is denoted as fi, it is followed successively by f1=0.01Hz, f2=0.02Hz, f3=0.05Hz, f4=0.1Hz, f5
=0.2Hz, f6=0.5Hz, f7=1Hz, f8=2Hz, f9=5Hz, f10=10Hz, f11=20Hz f12=50Hz, f13=
100Hz, f14=200Hz, f15=500Hz, f16=1000Hz, carries out the test of its complex dielectric permittivity, and takes complex dielectric permittivity
Imaginary part is denoted as frequency response parameter value to be measured16 groups obtainedData are referred to as rung to measured frequency
Argument sequence is answered, i is integer, i ∈ [1,16]；
3.3: cable standard deviation factors calculate, comprising:
3.3.1 it is fitted, is obtained corresponding using the reference frequency response parameter sequence that Newton interpolation method obtains test
Frequency spectrum mathematical model Y0(f) as follows:
Y0(f)=ε1+ε2(f-f1)+ε3(f-f1)(f-f2)+ε4(f-f1)(f-f2)(f-f3)+…·+εn(f-f1)(f-f2)(f-
f3)…·(f-fn-1)
In formula, f1,f2,…·fnFor the frequency values of test point,It is frequency spectrum mathematical model Y0(f) first be
Number,It is the reference frequency response parameter value of the 1st frequency test point,
ε2、ε3、ε4、…、εnRespectively indicate frequency spectrum mathematical model Y0(f) the 2nd, 3 ..., n coefficient, the range of n meets: n ∈
[2,16], wherein
…
y0[f1,f2,…·fn-1,fn] indicateDifference related coefficient；
3.3.2: being fitted, obtained corresponding using the frequency response argument sequence to be measured that Newton interpolation method obtains test
Frequency spectrum mathematical model YX(f) as follows:
YX(f)=β1+β2(f-f1)+β3(f-f1)(f-f2)+β4(f-f1)(f-f2)(f-f3)+…·+βn(f-f1)(f-f2)…·
(f-fn-1)
In formula, f1,f2,…·fn-1,fnFor the frequency values of test point,For frequency spectrum mathematical model YX(f) first
A coefficient,It is the frequency response parameter value to be measured of the 1st frequency test point, β2、β3、β4、…、βnRespectively indicate spectrum number
Learn model YX(f) the 2nd, 3,4 ..., n coefficient, the range of n meets: n ∈ [2,16], wherein
…
yX[f1,f2,…·fn-1,fn] indicateDifference related coefficient；
3.3.3；The integral difference of digital simulation spectrum curve mathematical modelIt is as follows,
Fitting spectrum curve within the scope of 0.01Hz~1000Hz is divided into according to 16 frequency test points of step 3.1,3.2
15 calculation of sector, each section is with the left end frequency label f in the sectioniLower label i as section label, for each area
Between Y in section0(f) and YX(f) integral difference solution, the integral difference of each section spectrum curve model are carried outAre as follows:
In formula, i is integer, and the range of i meets: i ∈ [1,15], fiFor the frequency values of i-th of test point in step 3.1 and 3.2；
3.3.4: calculating fault spectrum curve section accounting influences coefficient hi, it is as follows:
In formula, i is integer, and the range of i meets: i ∈ [1,15]；For the fitting spectrum curve mathematical model integral differenceAverage value, σ be fitting spectrum curve mathematical model integral differenceStandard deviation,Calculating in 3.3.3
It provides,It is as follows with the expression formula of σ:
3.3.5: calculate cable standard deviation factors λ:
Cable is normal condition if λ≤0.5, and otherwise there are failures for cable, continues analysis and determines 3.4；
3.4: defining YX(f) in, adjacent two segments integral area is poorFor
In formula, i is integer, and the range of i meets: i ∈ [1,14], fiFor the frequency values of i-th of test point；
Fault simulation cable dampness loss factor ξ is calculated, as follows:
According to the value range of ξ, judge that cable under test is slight humidified insulation, moderate humidified insulation or severe humidified insulation.
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